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Maneein S, Sangsanont J, Limpiyakorn T, Sirikanchana K, Rattanakul S. The coagulation process for enveloped and non-enveloped virus removal in turbid water: Removal efficiencies, mechanisms and its application to SARS-CoV-2 Omicron BA.2. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 931:172945. [PMID: 38703849 DOI: 10.1016/j.scitotenv.2024.172945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 04/19/2024] [Accepted: 04/30/2024] [Indexed: 05/06/2024]
Abstract
The coagulation process has a high potential as a treatment method that can handle pathogenic viruses including emerging enveloped viruses in drinking water treatment process which can lower infection risk through drinking water consumption. In this study, a surrogate enveloped virus, bacteriophage Փ6, and surrogate non-enveloped viruses, including bacteriophage MS-2, T4, ՓX174, were used to evaluate removal efficiencies and mechanisms by the conventional coagulation process with alum, poly‑aluminum chloride, and ferric chloride at pH 5, 7, and 9 in turbid water. Also, treatability of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a recent virus of global concern by coagulation was evaluated as SARS-CoV-2 can presence in drinking water sources. It was observed that an increase in the coagulant dose enhanced the removal efficiency of turbidity and viruses, and the condition that provided the highest removal efficiency of enveloped and non-enveloped viruses was 50 mg/L of coagulants at pH 5. In addition, the coagulation process was more effective for enveloped virus removal than for the non-enveloped viruses, and it demonstrated reduction of SARS-CoV-2 Omicron BA.2 over 0.83-log with alum. According to culture- and molecular-based assays (qPCR and CDDP-qPCR), the virus removal mechanisms were floc adsorption and coagulant inactivation. Through inactivation with coagulants, coagulants caused capsid destruction, followed by genome damage in non-enveloped viruses; however, damage to a lipid envelope is suggested to contribute to a great extend for enveloped virus inactivation. We demonstrated that conventional coagulation is a promising method for controlling emerging and re-emerging viruses in drinking water.
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Affiliation(s)
- Siriwara Maneein
- Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand
| | - Jatuwat Sangsanont
- Department of Environmental Science, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand; Water Science and Technology for Sustainable Environmental Research Unit, Chulalongkorn University, Bangkok 10330, Thailand
| | - Tawan Limpiyakorn
- Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
| | - Kwanrawee Sirikanchana
- Research Laboratory of Biotechnology, Chulabhorn Research Institute, Bangkok 10210, Thailand; Center of Excellence on Environmental Health and Toxicology (EHT), OPS, MHESI, Bangkok 10400, Thailand
| | - Surapong Rattanakul
- Department of Environmental Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.
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Miura T, Kadoya SS, Miura Y, Takino H, Akiba M, Sano D, Masuda T. Pepper mild mottle virus intended for use as a process indicator for drinking water treatment: Present forms and quantitative relations to norovirus and rotavirus in surface water. WATER RESEARCH 2024; 257:121713. [PMID: 38733963 DOI: 10.1016/j.watres.2024.121713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 03/19/2024] [Accepted: 05/01/2024] [Indexed: 05/13/2024]
Abstract
Pepper mild mottle virus (PMMoV) has been proposed as a potential indicator of human enteric viruses in environmental water and for viral removal during drinking water treatment. To investigate the occurrence and present forms of PMMoV and quantitative relations to norovirus GII and rotavirus A (RVA) in surface waters, 147 source water samples were collected from 21 drinking water treatment plants (DWTPs) in Japan between January 2018 and January 2021, and the concentrations of viruses in suspended and dissolved fractions were measured using real-time RT-PCR. PMMoV was detected in 81-100 % of samples in each sample month and observed concentrations ranged from 3.0 to 7.0 log10 copies/L. The concentrations of PMMoV were higher in dissolved fraction compared to suspended fractions, while different partitioning was observed for NoV GII depending on seasons. The concentrations of PMMoV were basically higher than those of norovirus GII (1.9-5.3 log10 copies/L) and RVA (1.9-6.6 log10 copies/L), while in 18 samples, RVA presented higher concentrations than PMMoV. Partial regions of VP7, VP4, and VP6 of the RVA in the 18 samples were amplified using nested PCR, and the genotypes were determined using an amplicon-based next-generation sequencing approach. We found that these source water samples included not only human RVA but also various animal RVA and high genetic diversity due to the existence of animal RVA was associated with a higher RVA concentration than PMMoV. Our findings suggest that PMMoV can be used as an indicator of norovirus GII and human RVA in drinking water sources and that the indicator performance should be evaluated by comparing to zoonotic viruses as well as human viruses.
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Affiliation(s)
- Takayuki Miura
- Department of Environmental Health, National Institute of Public Health, Wako, Japan.
| | - Syun-Suke Kadoya
- Department of Civil and Environmental Engineering, Tohoku University, Japan; Department of Urban Engineering, The University of Tokyo, Japan
| | - Yohei Miura
- Department of Civil and Environmental Engineering, Tohoku University, Japan
| | - Hiroyuki Takino
- Department of Environmental Health, National Institute of Public Health, Wako, Japan
| | - Michihiro Akiba
- Department of Environmental Health, National Institute of Public Health, Wako, Japan
| | - Daisuke Sano
- Department of Civil and Environmental Engineering, Tohoku University, Japan
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3
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Mullins N, Alashraf AR, McDermott K, Brown RS, Payne SJ. Polyethylenimine mediated recovery of SARS-CoV-2 and total viral RNA: Impact of aqueous conditions on behaviour and recovery. WATER RESEARCH 2024; 253:121207. [PMID: 38401469 DOI: 10.1016/j.watres.2024.121207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 10/28/2023] [Accepted: 01/26/2024] [Indexed: 02/26/2024]
Abstract
Wastewater-based epidemiology (WBE) is an emerging, practical surveillance tool for monitoring community levels of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2, SC2). However, a paucity of data exists regarding SARS-CoV-2 and viral biomarker behaviour in aqueous and wastewater environments. Therefore, there is a pressing need to develop efficient and robust methods that both improve method sensitivity and reduce time and cost. We present a novel method for SARS-CoV-2, Human Coronavirus 229E (229E), and Pepper Mild Mottle Virus (PMMoV) recovery utilizing surface charge-based attraction via the branched cationic polymer, polyethylenimine (PEI). Initially, dose-optimization experiments demonstrated that low concentrations of PEI (0.001% w/v) proved most effective at flocculating suspended viruses and viral material, including additional unbound SC2 viral fragments and/or RNA from raw wastewater. A design-of-experiments (DOE) approach was used to optimize virus and/or viral material aggregation behaviour and recovery across varying aqueous conditions, revealing pH as a major influence on recoverability in this system, combinatorially due to both a reduction in viral material surface charge and increased protonation of PEI-bound amine groups. Overall, this method has shown great promise in significantly improving quantitative viral recovery, providing a straightforward and effective augmentation to standard centrifugation techniques.
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Affiliation(s)
- Nathan Mullins
- Queen's University, Department of Civil Engineering, Kingston, Ontario, K7L 3N6, Canada; McMaster University, Department of Chemical Engineering, Hamilton, Ontario, L8S 4L7, Canada
| | - Abdul Rahman Alashraf
- Queen's University, Department of Civil Engineering, Kingston, Ontario, K7L 3N6, Canada; Queen's University, Beaty Water Research Centre, Department of Civil Engineering, Kingston, Ontario, K7L 3N6, Canada
| | | | - R Stephen Brown
- Queen's University, Department of Chemistry and School of Environmental Studies, Kingston, Ontario, K7L 3N6, Canada; Queen's University, Beaty Water Research Centre, Department of Civil Engineering, Kingston, Ontario, K7L 3N6, Canada.
| | - Sarah Jane Payne
- Queen's University, Department of Civil Engineering, Kingston, Ontario, K7L 3N6, Canada; Queen's University, Beaty Water Research Centre, Department of Civil Engineering, Kingston, Ontario, K7L 3N6, Canada.
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4
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Monnot M, Ollivier J, Taligrot H, Garry P, Cordier C, Stravakakis C, Le Guyader FS, Moulin P. Retention of Virus Versus Surrogate, by Ultrafiltration in Seawater: Case Study of Norovirus Versus Tulane. FOOD AND ENVIRONMENTAL VIROLOGY 2024; 16:14-24. [PMID: 38184502 DOI: 10.1007/s12560-023-09574-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 11/28/2023] [Indexed: 01/08/2024]
Abstract
In the field of chemical engineering and water treatment, the study of viruses, included surrogates, is well documented. Often, surrogates are used to study viruses and their behavior because they can be produced in larger quantities in safer conditions and are easier to handle. In fact, surrogates allow studying microorganisms which are non-infectious to humans but share some properties similar to pathogenic viruses: structure, composition, morphology, and size. Human noroviruses, recognized as the leading cause of epidemics and sporadic cases of gastroenteritis across all age groups, may be mimicked by the Tulane virus. The objectives of this work were to study (i) the ultrafiltration of Tulane virus and norovirus to validate that Tulane virus can be used as a surrogate for norovirus in water treatment process and (ii) the retention of norovirus and the surrogate as a function of water quality to better understand the use of the latter pathogenic viruses. Ultrafiltration tests showed significant logarithmic reduction values (LRV) in viral RNA: around 2.5 for global LRV (i.e., based on the initial and permeate average concentrations) and between 2 and 6 for average LRV (i.e., retention rate considering the increase of viral concentration in the retentate), both for norovirus and the surrogate Tulane virus. Higher reduction rates (from 2 to 6 log genome copies) are obtained for higher initial concentrations (from 101 to 107 genome copies per mL) due to virus aggregation in membrane lumen. Tulane virus appears to be a good surrogate for norovirus retention by membrane processes.
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Affiliation(s)
- M Monnot
- Aix Marseille Univ., CNRS, Centrale Marseille, M2P2 UMR 7340, Equipe Procédés Membranaires (EPM), Europôle de l'Arbois, Pavillon Laennec, Hall C, BP80, 13545, Aix-en-Provence, France
| | - J Ollivier
- Ifremer - U. Microbiologie, Aliment, Santé et Environnement (LSEM/RBE), Rue de l'Ile d'Yeu, BP 21105, 44311, Nantes, Cedex 3, France
| | - H Taligrot
- Aix Marseille Univ., CNRS, Centrale Marseille, M2P2 UMR 7340, Equipe Procédés Membranaires (EPM), Europôle de l'Arbois, Pavillon Laennec, Hall C, BP80, 13545, Aix-en-Provence, France
| | - P Garry
- Ifremer - U. Microbiologie, Aliment, Santé et Environnement (LSEM/RBE), Rue de l'Ile d'Yeu, BP 21105, 44311, Nantes, Cedex 3, France
| | - C Cordier
- Aix Marseille Univ., CNRS, Centrale Marseille, M2P2 UMR 7340, Equipe Procédés Membranaires (EPM), Europôle de l'Arbois, Pavillon Laennec, Hall C, BP80, 13545, Aix-en-Provence, France
| | - C Stravakakis
- Ifremer - EMMA Plateforme Expérimentale Mollusques Marins Atlantique, 85230, Bouin, France
| | - F S Le Guyader
- Ifremer - U. Microbiologie, Aliment, Santé et Environnement (LSEM/RBE), Rue de l'Ile d'Yeu, BP 21105, 44311, Nantes, Cedex 3, France
| | - P Moulin
- Aix Marseille Univ., CNRS, Centrale Marseille, M2P2 UMR 7340, Equipe Procédés Membranaires (EPM), Europôle de l'Arbois, Pavillon Laennec, Hall C, BP80, 13545, Aix-en-Provence, France.
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Hegazy N, Tian X, D'Aoust PM, Pisharody L, Towhid ST, Mercier É, Zhang Z, Wan S, Thakali O, Kabir MP, Fang W, Nguyen TB, Ramsay NT, MacKenzie AE, Graber TE, Guilherme S, Delatolla R. Impact of coagulation on SARS-CoV-2 and PMMoV viral signal in wastewater solids. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:5242-5253. [PMID: 38112868 DOI: 10.1007/s11356-023-31444-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 12/05/2023] [Indexed: 12/21/2023]
Abstract
Wastewater surveillance (WWS) of SARS-CoV-2 has become a crucial tool for monitoring COVID-19 cases and outbreaks. Previous studies have indicated that SARS-CoV-2 RNA measurement from testing solid-rich primary sludge yields better sensitivity compared to testing wastewater influent. Furthermore, measurement of pepper mild mottle virus (PMMoV) signal in wastewater allows for precise normalization of SARS-CoV-2 viral signal based on solid content, enhancing disease prevalence tracking. However, despite the widespread adoption of WWS, a knowledge gap remains regarding the impact of ferric sulfate coagulation, commonly used in enhanced primary clarification, the initial stage of wastewater treatment where solids are sedimented and removed, on SARS-CoV-2 and PMMoV quantification in wastewater-based epidemiology. This study examines the effects of ferric sulfate addition, along with the associated pH reduction, on the measurement of SARS-CoV-2 and PMMoV viral measurements in wastewater primary clarified sludge through jar testing. Results show that the addition of Fe3+ concentrations in the conventional 0 to 60 mg/L range caused no effect on SARS-CoV-2 N1 and N2 gene region measurements in wastewater solids. However, elevated Fe3+ concentrations were shown to be associated with a statistically significant increase in PMMoV viral measurements in wastewater solids, which consequently resulted in the underestimation of PMMoV-normalized SARS-CoV-2 viral signal measurements (N1 and N2 copies/copies of PMMoV). The observed pH reduction from coagulant addition did not contribute to the increased PMMoV measurements, suggesting that this phenomenon arises from the partitioning of PMMoV viral particles into wastewater solids.
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Affiliation(s)
- Nada Hegazy
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Xin Tian
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Patrick M D'Aoust
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Lakshmi Pisharody
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | | | - Élisabeth Mercier
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Zhihao Zhang
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Shen Wan
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Ocean Thakali
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Md Pervez Kabir
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Wanting Fang
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Tram B Nguyen
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Nathan T Ramsay
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada
| | - Alex E MacKenzie
- Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada
| | - Tyson E Graber
- Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON, Canada
| | | | - Robert Delatolla
- Department of Civil Engineering, University of Ottawa, Ottawa, ON, Canada.
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6
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Canh VD, Nga TTV, Lien NT, Katayama H. Development of a simple and low-cost method using Moringa seeds for efficient virus concentration in wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 905:167101. [PMID: 37716673 DOI: 10.1016/j.scitotenv.2023.167101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Revised: 09/12/2023] [Accepted: 09/13/2023] [Indexed: 09/18/2023]
Abstract
Effective virus concentration methods are essential for detecting pathogenic viruses in environmental waters and play a crucial role in wastewater-based epidemiology. However, the current methods are often expensive, complicated, and time-consuming, which limits their practical application. In this study, a simple and low-cost method was developed using the extract of Moringa oleifera (MO) seeds (MO method) to recover both enveloped and non-enveloped viruses, including pepper mild mottle virus (PMMoV), murine norovirus (MNV), Aichivirus (AiV), murine hepatitis virus (MHV), and influenza A virus subtype H1N1[H1N1] in wastewater. The optimal conditions for the MO method were determined to be a concentration of MO extract at the UV280 value of 0.308 cm-1 and an elution buffer (0.05 M KH2PO4, 1 M NaCl, 0.1 % Tween80 [v/v]) for recovering the tested viruses in wastewater. Compared to other commonly used virus concentration methods such as InnovaPrep, HA, PEG, and Centricon, the MO method was found to be more efficient and cost-effective in recovering the tested viruses. Moreover, the MO method was successfully applied to detect various types of viruses (PMMoV, AiV, norovirus of genotype II [NoV II], enterovirus [EV], influenza A virus [matrix gene] [IAV], and SARS-CoV-2) in raw wastewater. Thus, the developed MO method could offer a simple, low-cost, and efficient tool to concentrate viruses in wastewater.
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Affiliation(s)
- Vu Duc Canh
- Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Tran Thi Viet Nga
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung, Hanoi, Viet Nam
| | - Nguyen Thuy Lien
- Faculty of Environmental Engineering, Hanoi University of Civil Engineering, 55 Giai Phong Road, Hai Ba Trung, Hanoi, Viet Nam
| | - Hiroyuki Katayama
- Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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Shirakawa D, Shirasaki N, Hu Q, Matsushita T, Matsui Y, Takagi H, Oka T. Investigation of removal and inactivation efficiencies of human sapovirus in drinking water treatment processes by applying an in vitro cell-culture system. WATER RESEARCH 2023; 236:119951. [PMID: 37060876 DOI: 10.1016/j.watres.2023.119951] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 04/04/2023] [Accepted: 04/06/2023] [Indexed: 06/19/2023]
Abstract
Here, we examined the efficiencies of drinking water treatment processes for the removal and inactivation of human sapovirus (HuSaV). We applied a recently developed in vitro cell-culture system to produce purified solutions of HuSaV containing virus concentrations high enough to conduct virus-spiking experiments, to develop an integrated cell culture-polymerase chain reaction (ICC-PCR) assay to quantify the infectivity of HuSaV, and to conduct virus-spiking experiments. In virus-spiking coagulation-sedimentation-rapid sand filtration (CS-RSF) and coagulation-microfiltration (C-MF) experiments, HuSaV removals of 1.6-3.7-log10 and 1.2->4.3-log10, respectively, were observed. The removal ratios observed with CS-RSF were comparable and correlated with those of murine norovirus (MNV, a widely used surrogate for human noroviruses) and pepper mild mottle virus (PMMoV, a potential surrogate for human enteric viruses in physical and physicochemical drinking water treatment processes), and those observed with C-MF were higher than but still correlated with those of MNV and PMMoV, indicating that MNV and PMMoV are both potential surrogates for HuSaV in CS-RSF and C-MF. For astrovirus (AstV, a representative human enteric virus), removal ratios of 1.8-3.3-log10 and 1.1->4.0-log10 were observed with CS-RSF and C-MF, respectively. The removal ratios of AstV observed with CS-RSF were comparable and correlated with those of PMMoV, and those observed with C-MF were higher than but still correlated with those of PMMoV, indicating that PMMoV is a potential surrogate for AstV in CS-RSF and C-MF. When the efficacy of chlorine treatment was examined by using the developed ICC-PCR assay, 3.8-4.0-log10 inactivation of HuSaV was observed at a CT value (free-chlorine concentration [C] multiplied by contact time [T]) of 0.02 mg-Cl2·min/L. The infectivity reduction ratios of HuSaV were comparable with those of MNV. For AstV, 1.3-1.7-log10 and >3.4-log10 inactivation, as evaluated by ICC-PCR, was observed at CT values of 0.02 and 0.09 mg-Cl2·min/L, respectively. These results indicate that HuSaV and AstV are both highly sensitive to chlorine treatment and more sensitive than a chlorine-resistant virus, coxsackievirus B5 (1.3-log10 inactivation at a CT value of 0.4 mg-Cl2·min/L, as evaluated by the ICC-PCR assay).
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Affiliation(s)
- D Shirakawa
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
| | - N Shirasaki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan.
| | - Q Hu
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
| | - T Matsushita
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
| | - Y Matsui
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
| | - H Takagi
- Management Department of Biosafety, Laboratory Animal and Pathogen Bank, National Institute of Infectious Diseases, Tokyo, 208-0011, Japan
| | - T Oka
- Department of Virology II, National Institute of Infectious Diseases, Tokyo, 208-0011, Japan
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Yasui M, Ikner L, Yonetani T, Liu M, Katayama H. Effects of surface hydrophobicity on the removal of F-specific RNA phages from reclaimed water by coagulation and ceramic membrane microfiltration. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 87:2304-2314. [PMID: 37186632 PMCID: wst_2023_133 DOI: 10.2166/wst.2023.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Microfiltration (MF) has been widely adopted as an advanced treatment process to reduce suspended solids and turbidity in treated wastewater effluents designated for potable reuse. Although microfilter pores are much larger than viruses, the addition of a coagulant upstream of a microfilter system can achieve stable virus removal. Ceramic membranes have a narrow pore size distribution to achieve the high removal of contaminants. This study aims to evaluate virus log reduction using bench-scale coagulation and ceramic membrane MF. To investigate the effects of differences in net surface hydrophobicity, 18 sewage-derived F-specific RNA phages (FRNAPHs) were used for batch hydrophobicity and coagulation-MF tests. The capability of bench-scale coagulation and ceramic membrane MF under continuous automated long-term operation was tested to remove the lab reference strain MS2 and three selected FRNAPH isolates which varied by surface property. Median virus log reduction values (LRVs) exceeding 6.2 were obtained for all three isolates and MS2. Although coagulation and hydrophobicity were positively correlated, the virus isolate demonstrating the lowest level of hydrophobicity and coagulation (genogroup I) still exhibited a high LRV. Thus, coagulation and ceramic membrane MF systems may serve as viable options for virus removal during water reclamation and advanced treatment.
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Affiliation(s)
- Midori Yasui
- Department of Urban Engineering, The University of Tokyo, Tokyo, Japan E-mail:
| | - Luisa Ikner
- Department of Environmental Science, The University of Arizona, Tucson, AZ, USA
| | | | - Miaomiao Liu
- Department of Urban Engineering, The University of Tokyo, Tokyo, Japan E-mail:
| | - Hiroyuki Katayama
- Department of Urban Engineering, The University of Tokyo, Tokyo, Japan E-mail:
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9
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Qin J, Ziemann E, Bar-Zeev E, Bone SE, Liang Y, Mauter MS, Herzberg M, Bernstein R. Microporous Polyethersulfone Membranes Grafted with Zwitterionic Polymer Brushes Showing Microfiltration Permeance and Ultrafiltration Bacteriophage Removal. ACS APPLIED MATERIALS & INTERFACES 2023; 15:18343-18353. [PMID: 37010122 DOI: 10.1021/acsami.3c01495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Virus removal from water using microfiltration (MF) membranes is of great interest but remains challenging owing to the membranes' mean pore sizes typically being significantly larger than most viruses. We present microporous membranes grafted with polyzwitterionic brushes (N-dimethylammonium betaine) that combine bacteriophage removal in the range of ultrafiltration (UF) membranes with the permeance of MF membranes. Brush structures were grafted in two steps: free-radical polymerization followed by atom transfer radical polymerization (ATRP). Attenuated total reflection Fourier transform infrared (ATR-FTIR) and X-ray photoelectron (XPS) verified that grafting occurred at both sides of the membranes and that the grafting increased with increasing the zwitterion monomer concentration. The log reduction values (LRVs) of the pristine membrane increased from less than 0.5 LRV for T4 (∼100 nm) and NT1 (∼50 nm) bacteriophages to up to 4.5 LRV for the T4 and 3.1 LRV for the NT1 for the brush-grafted membranes with a permeance of about 1000 LMH/bar. The high permeance was attributed to a high-water fraction in the ultra-hydrophilic brush structure. The high measured LRVs of the brush-grafted membranes were attributed to enhanced bacteriophages exclusion from the membrane surface and entrapment of the ones that penetrated the pores due to the membranes' smaller mean pore-size and cross-section porosity than those of the pristine membrane, as seen by scanning electron microscopy (SEM) and measured using liquid-liquid porometry. Micro X-ray fluorescence (μ-XRF) spectrometry and nanoscale secondary ion mass spectrometry showed that 100 nm Si-coated gold nanospheres accumulated on the surface of the pristine membrane but not on the brush-coated membrane and that the nanospheres that penetrated the membranes were entrapped in the brush-grafted membrane but passed the pristine one. These results corroborate the LRVs obtained during filtration experiments and support the inference that the increased removal was due to a combined exclusion mechanism and entrapment. Overall, these microporous brush-grafted membranes show potential for use in advanced water treatment.
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Affiliation(s)
- Ji Qin
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research of the Ben-Gurion University of the Negev, Campus Sde Boker, Midreshet 84990, Israel
| | - Eric Ziemann
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research of the Ben-Gurion University of the Negev, Campus Sde Boker, Midreshet 84990, Israel
| | - Edo Bar-Zeev
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research of the Ben-Gurion University of the Negev, Campus Sde Boker, Midreshet 84990, Israel
| | - Sharon E Bone
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Yuanzhe Liang
- Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States
| | - Meagan S Mauter
- Civil and Environmental Engineering, Stanford University, Stanford, California 94305, United States
| | - Moshe Herzberg
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research of the Ben-Gurion University of the Negev, Campus Sde Boker, Midreshet 84990, Israel
| | - Roy Bernstein
- Zuckerberg Institute for Water Research, The Jacob Blaustein Institutes for Desert Research of the Ben-Gurion University of the Negev, Campus Sde Boker, Midreshet 84990, Israel
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10
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Liu L, Lu S, An G, Yang B, Zhao X, Wu D, He H, Wang D. Historical development of Al30 highlighting the unique characteristics and application in water treatment: A review. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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11
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Fahrenfeld NL, Morales Medina WR, D'Elia S, Deshpande AS, Ehasz G. Year-long wastewater monitoring for SARS-CoV-2 signals in combined and separate sanitary sewers. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e10768. [PMID: 35918060 DOI: 10.1021/acsestwater.1c00345] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 06/07/2022] [Accepted: 07/01/2022] [Indexed: 05/27/2023]
Abstract
COVID-19 wastewater-based epidemiology has been performed in catchments of various sizes and sewer types with many short-term studies available and multi-seasonal studies emerging. The objective of this study was to compare weekly observations of SARS-CoV-2 genes in municipal wastewater across multiple seasons for different systems as a factor of sewer type (combined, separate sanitary) and system size. Sampling occurred following the first wave of SARS-CoV-2 cases in the study region (June 2020) and continued through the third wave (May 2021), the period during which clinical testing was widely available and different variants dominated clinical cases. The strongest correlations were observed between wastewater N1 concentrations and the cumulative clinical cases reported in the 2 weeks prior to wastewater sampling, followed by the week prior, new cases, and the week after wastewater sampling. Sewer type and size did not necessarily explain the strength of the correlations, indicating that other non-sewer factors may be impacting the observations. In-system sampling results for the largest system sampled are presented for 1 month. Removing wet weather days from the data sets improved even the flow-normalized correlations for the systems, potentially indicating that interpreting results during wet weather events may be more complicated than simply accounting for dilution. PRACTITIONER POINTS: SARS-CoV-2 in wastewater correlated best with total clinical cases reported in 2 weeks before wastewater sampling at the utility level. Study performed when clinical testing was widespread during the year after the first COVID-19 wave in the region. Sewer type and size did not necessarily explain correlation strength between clinical cases and wastewater-based epidemiology results. Removing wet weather days improved correlations for 3/4 utilities studied, including both separate sanitary and combined sewers.
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Affiliation(s)
- Nicole L Fahrenfeld
- Department of Civil and Environmental Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
| | - William R Morales Medina
- Department of Microbiology and Molecular Genetics, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
| | - Stephanie D'Elia
- Department of Biochemistry and Microbiology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
| | - Aishwarya S Deshpande
- Department of Biochemistry and Microbiology, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
| | - Genevieve Ehasz
- Department of Civil and Environmental Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
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12
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Alamin M, Tsuji S, Hata A, Hara-Yamamura H, Honda R. Selection of surrogate viruses for process control in detection of SARS-CoV-2 in wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 823:153737. [PMID: 35149069 PMCID: PMC8824713 DOI: 10.1016/j.scitotenv.2022.153737] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 05/24/2023]
Abstract
Since SARS-CoV-2 RNA in wastewater is often present at low concentration or under detection limit, ensuring the reliability of detection processes using appropriate process controls is essential. The objective of this study was to evaluate applicability and limitations of candidate surrogate viruses as process controls under combinations of different virus concentration and RNA extraction methods. Detection efficiency of SARS-CoV-2 spiked in wastewater was compared with those of candidate surrogate viruses of bacteriophage ϕ6, pepper mild mottle virus (PMMoV), F-specific coliphage (F-phage), and murine norovirus (MNV). After inactivated SARS-CoV-2 and ϕ6 were spiked in two different wastewaters, the viruses in solid and liquid fractions of wastewater were concentrated by centrifuge and polyethylene glycol (PEG) precipitation, respectively. Viral RNA was extracted by using QIAamp Viral RNA Mini Kit and 3 other commercially available extraction kits, then quantified by reverse transcription-quantitative PCR using CDCN1 assay. Regardless of extraction kits, SARS-CoV-2 was consistently detected with good efficiency from both liquid (11-200%) and solid fractions (7.1-93%). Among the candidate process controls, PMMoV was widely detected at good efficiencies from both liquid and solid fractions regardless of selection of RNA extraction kits. F-phage and MNV also showed good detection efficiencies in most combinations of wastewater fractions and RNA extraction kits. An enveloped virus ɸ6 was found often undetected or to have very low detection efficiency (0.1-4.2%) even when SARS-CoV-2 spiked in wastewater was detected with good efficiency. Consequently, PMMoV is widely applicable as process control for detection of SARS-CoV-2 either in liquid fractions concentrated by PEG precipitation, or in solid fractions concentrated by centrifuge.
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Affiliation(s)
- Md Alamin
- Graduate School of Natural Science and Technology, Kanazawa University, Japan
| | - Shohei Tsuji
- School of Environmental Design, Kanazawa University, Japan
| | - Akihiko Hata
- Faculty of Engineering, Toyama Prefectural University, Japan
| | | | - Ryo Honda
- Faculty of Geosciences and Civil Engineering, Kanazawa University, Japan.
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13
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Liu G, Qu J, Rose J, Medema G. Roadmap for Managing SARS-CoV-2 and Other Viruses in the Water Environment for Public Health. ENGINEERING (BEIJING, CHINA) 2022; 12:139-144. [PMID: 33654547 PMCID: PMC7909608 DOI: 10.1016/j.eng.2020.09.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 09/15/2020] [Accepted: 09/24/2020] [Indexed: 05/25/2023]
Abstract
The water sector needs to address viral-related public health issues, because water is a virus carrier, which not only spreads viruses (e.g., via drinking water), but also provides information about the circulation of viruses in the community (e.g., via sewage). It has been widely reported that waterborne viral pathogens are abundant, diverse, complex, and threatening the public health in both developed and developing countries. Meanwhile, there is great potential for viral monitoring that can indicate biosafety, treatment performance and community health. New developments in technology have been rising to meet the emerging challenges over the past decades. Under the current coronavirus disease 2019 (COVID-19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the world's attention is directed to the urgent need to tackle the most challenging public health issues related to waterborne viruses. Based on critical analysis of the water viral knowledge progresses and gaps, this article offers a roadmap for managing COVID-19 and other viruses in the water environments for ensuring public health.
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Affiliation(s)
- Gang Liu
- Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jiuhui Qu
- Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Joan Rose
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48823, USA
| | - Gertjan Medema
- Department of Fisheries and Wildlife, Michigan State University, East Lansing, MI 48823, USA
- KWR Water Research Institute, Nieuwegein 3433 PE, Netherlands
- Sanitary Engineering, Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft 2628 CN, Netherlands
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14
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Pang L, Lin S, McGill E, Tham A, Hewitt J, Nokes C, Ward V. Reductions of human enteric viruses in 10 commonly used activated carbon, polypropylene and polyester household drinking-water filters. WATER RESEARCH 2022; 213:118174. [PMID: 35183016 DOI: 10.1016/j.watres.2022.118174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 02/07/2022] [Accepted: 02/09/2022] [Indexed: 06/14/2023]
Abstract
Drinking-water treatment in non-networked rural communities relies on the use of point-of-use (PoU) household filters. Source waters treated by PoU filters are often microbially contaminated, but information about human enteric virus reductions in these filters is limited. This study evaluated human rotavirus, adenovirus and norovirus reductions in 10 commonly used, new PoU carbon, polypropylene and polyester microfilters. The viruses were spiked into chlorine-free tap water (pH 8.0, ionic strength 1.22 mM), and 3 sequential challenge tests were conducted in each filter under a constant flow rate of 1 L/min. In most of the filters investigated, the norovirus and adenovirus reductions were similar (P > 0.49). Compared with the norovirus and adenovirus reductions, the rotavirus reductions were significantly lower in the carbon filters (P ≤ 0.009), which may relate to rotavirus's higher zeta potential and lower hydrophobicity. Virus reductions appeared to be dictated by the filter media type through electrostatic and hydrophobic interactions; the effects of filter media pore sizes on virus reductions via physical size-exclusion were very limited. The virus reductions in the carbon filters were significantly greater than those in the polypropylene and polyester filters (P ≤ 0.0001), and they did not differ significantly between the polypropylene and polyester filters (P > 0.24). None of the filters met the "protective" rotavirus reduction level (≥3 log10) required for household drinking-water treatment. Our study's findings highlight a critical need for additional water treatment when using PoU microfilters, for example, water boiling or ultraviolet radiation, or the use of effective surface-modified filter media to prevent drinking-waterborne infections from enteric viruses.
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Affiliation(s)
- Liping Pang
- Institute of Environmental Science and Research Ltd, PO Box 29181, Christchurch 8540, New Zealand.
| | - Susan Lin
- Institute of Environmental Science and Research Ltd, PO Box 29181, Christchurch 8540, New Zealand
| | - Erin McGill
- Institute of Environmental Science and Research Ltd, PO Box 29181, Christchurch 8540, New Zealand
| | - Annabelle Tham
- Institute of Environmental Science and Research Ltd, PO Box 29181, Christchurch 8540, New Zealand; Department of Microbiology and Immunology, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| | - Joanne Hewitt
- Institute of Environmental Science & Research Ltd, Kenepuru Science Centre, PO Box 50348, Porirua 5240, New Zealand
| | - Chris Nokes
- Institute of Environmental Science and Research Ltd, PO Box 29181, Christchurch 8540, New Zealand
| | - Vernon Ward
- Department of Microbiology and Immunology, University of Otago, PO Box 56, Dunedin 9054, New Zealand
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15
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Shirakawa D, Shirasaki N, Matsushita T, Matsui Y, Yamashita R, Matsumura T, Koriki S. Evaluation of reduction efficiencies of pepper mild mottle virus and human enteric viruses in full-scale drinking water treatment plants employing coagulation-sedimentation-rapid sand filtration or coagulation-microfiltration. WATER RESEARCH 2022; 213:118160. [PMID: 35151086 DOI: 10.1016/j.watres.2022.118160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 01/28/2022] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
Here, we evaluated the reduction efficiencies of indigenous pepper mild mottle virus (PMMoV, a potential surrogate for human enteric viruses to assess virus removal by coagulation-sedimentation-rapid sand filtration [CS-RSF] and coagulation-microfiltration [C-MF]) and representative human enteric viruses in four full-scale drinking water treatment plants that use CS-RSF (Plants A and B) or C-MF (Plants C and D). First, we developed a virus concentration method by using an electropositive filter and a tangential-flow ultrafiltration membrane to effectively concentrate and recover PMMoV from large volumes of water: the recovery rates of PMMoV were 100% when 100-L samples of PMMoV-spiked dechlorinated tap water were concentrated to 20 mL; even when spiked water volume was 2000 L, recovery rates of >30% were maintained. The concentrations of indigenous PMMoV in raw and treated water samples determined by using this method were always above the quantification limit of the real-time polymerase chain reaction assay. We therefore were able to determine its reduction ratios: 0.9-2.7-log10 in full-scale CS-RSF and 0.7-2.9-log10 in full-scale C-MF. The PMMoV reduction ratios in C-MF at Plant C (1.0 ± 0.3-log10) were lower than those in CS-RSF at Plants A (1.7 ± 0.5-log10) and B (1.4 ± 0.7-log10), despite the higher ability of MF for particle separation in comparison with RSF owing to the small pore size in MF. Lab-scale virus-spiking C-MF experiments that mimicked full-scale C-MF revealed that a low dosage of coagulant (polyaluminum chloride [PACl]) applied in C-MF, which is determined mainly from the viewpoint of preventing membrane fouling, probably led to the low reduction ratios of PMMoV in C-MF. This implies that high virus reduction ratios (>4-log10) achieved in previous lab-scale virus-spiking C-MF studies are not necessarily achieved in full-scale C-MF. The PMMoV reduction ratios in C-MF at Plant D (2.2 ± 0.6-log10) were higher than those at Plant C, despite similar coagulant dosages. In lab-scale C-MF, the PMMoV reduction ratios increased from 1-log10 (with PACl [basicity 1.5], as at Plant C) to 2-4-log10 (with high-basicity PACl [basicity 2.1], as at Plant D), suggesting that the use of high-basicity PACl probably resulted in higher reduction ratios of PMMoV at Plant D than at Plant C. Finally, we compared the reduction ratios of indigenous PMMoV and representative human enteric viruses in full-scale CS-RSF and C-MF. At Plant D, the concentrations of human norovirus genogroup II (HuNoV GII) in raw water were sometimes above the quantification limit; however, whether its reduction ratios in C-MF were higher than those of PMMoV could not be judged since reduction ratios were >1.4-log10 for HuNoV GII and 2.3-2.9-log10 for PMMoV. At Plant B, the concentrations of enteroviruses (EVs) and HuNoV GII in raw water were above the quantification limit on one occasion, and the reduction ratios of EVs (>1.2-log10) and HuNoV GII (>1.5-log10) in CS-RSF were higher than that of PMMoV (0.9-log10). This finding supports the usefulness of PMMoV as a potential surrogate for human enteric viruses to assess virus removal by CS-RSF.
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Affiliation(s)
- D Shirakawa
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - N Shirasaki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
| | - T Matsushita
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Y Matsui
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - R Yamashita
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - T Matsumura
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - S Koriki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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16
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Imbibition of Newtonian Fluids in Paper-like Materials with the Infinitesimal Control Volume Method. MICROMACHINES 2021; 12:mi12111391. [PMID: 34832802 PMCID: PMC8626007 DOI: 10.3390/mi12111391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 10/31/2021] [Accepted: 11/10/2021] [Indexed: 12/26/2022]
Abstract
Paper-based microfluidic devices are widely used in point-of-care testing applications. Imbibition study of paper porous media is important for fluid controlling, and then significant to the applications of paper-based microfluidic devices. Here we propose an analytical approach based on the infinitesimal control volume method to study the imbibition of Newtonian fluids in commonly used paper-like materials. Three common paper shapes (rectangular paper strips, fan-shaped and circular paper sheets) are investigated with three modeling methods (corresponding to equivalent tiny pores with circle, square and regular triangle cross section respectively). A model is derived for liquid imbibition in rectangular paper strips, and the control equations for liquid imbibition in fan-shaped and circular paper sheets are also derived. The model is verified by imbibition experiments done using the mixed cellulose ester filter paper and pure water. The relation of imbibition distance and time is similar to that of the Lucas−Washburn (L−W) model. In addition, a new porosity measurement method based on the imbibition in circular paper sheets is proposed and verified. Finally, the flow rates are investigated. This study can provide guidance for the design of different shapes of paper, and for better applications of paper-based microfluidic devices.
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17
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Nakazawa Y, Abe T, Matsui Y, Shinno K, Kobayashi S, Shirasaki N, Matsushita T. Differences in removal rates of virgin/decayed microplastics, viruses, activated carbon, and kaolin/montmorillonite clay particles by coagulation, flocculation, sedimentation, and rapid sand filtration during water treatment. WATER RESEARCH 2021; 203:117550. [PMID: 34418646 DOI: 10.1016/j.watres.2021.117550] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/31/2021] [Accepted: 08/09/2021] [Indexed: 06/13/2023]
Abstract
One of the main purposes of drinking water treatment is to reduce turbidity originating from clay particles. Relatively little is known about the removal of other types of particles, including conventionally sized powdered activated carbon (PAC) and superfine PAC (SPAC), which are intentionally added during the treatment process; microplastic particles; and viruses. To address this knowledge gap, we conducted a preliminary investigation in full-scale water treatment plants and then studied the removal of these particles during coagulation-flocculation, sedimentation, and rapid sand filtration (CSF) in bench-scale experiments in which these particles were present together. Numbers of all target particles were greatly decreased by coagulation-flocculation and sedimentation (CS). Subsequent rapid sand filtration greatly reduced the concentrations of PAC and SPAC but not the concentrations of viruses, microplastic particles, and clay particles. Overall removal rates by CSF were 4.6 logs for PAC and SPAC, 3.5 logs for viruses, 2.9 logs for microplastics, and 2.8 logs for clay. The differences in removals were not explained by particle sizes or zeta potentials. However, for clays, PAC and SPAC, for which the particle size distributions were wide, smaller particles were less efficiently removed. The ratios of both clay to PAC and clay to SPAC particles increased greatly after rapid sand filtration because removal rates of PAC and SPAC particles were about 2 logs higher than removal rates of clay particles. The trend of greater reduction of PAC concentrations than turbidity was confirmed by measurements made in 14 full-scale water purification plants in which residual concentrations of PAC in treated water were very low, 40-200 particles/mL. Clay particles therefore accounted for most of the turbidity in sand filtrate, even though PAC was employed. The removal rate of microplastic particles was comparable to that of clays. Sufficient turbidity removal would therefore provide comparable removal of microplastics. We investigated the effect of mechanical/photochemical weathering on the removal of microplastics via CSF. Photochemical weathering caused a small increment in the removal rate of microplastics during CS but a small reduction in the removal rate of microplastics during rapid sand filtration; mechanical weathering decreased the removal rate via CS but increased the removal rate via rapid sand filtration. The changes of removal of microplastics might have been caused by changes of their zeta potential.
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Affiliation(s)
- Yoshifumi Nakazawa
- Department of Environmental Health, National Institute of Public Health, 2-3-6 Minami, Saitama, Wako 351-0197, Japan
| | - Taketo Abe
- Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Yoshihiko Matsui
- Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan.
| | - Koki Shinno
- Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Sakiko Kobayashi
- Graduate School of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Nobutaka Shirasaki
- Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
| | - Taku Matsushita
- Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
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18
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Jacquet N, Wurtzer S, Darracq G, Wyart Y, Moulin L, Moulin P. Effect of concentration on virus removal for ultrafiltration membrane in drinking water production. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119417] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Recovery of Nucleic Acids of Enteric Viruses and Host-Specific Bacteroidales from Groundwater by Using an Adsorption-Direct Extraction Method. Appl Environ Microbiol 2021; 87:e0071021. [PMID: 34232739 DOI: 10.1128/aem.00710-21] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In this study, the adsorption-elution method was modified to concentrate viral particles in water samples and investigate the contamination of groundwater with norovirus genogroup II (NoV GII), rotavirus A (RVA), and Pepper mild mottle virus (PMMoV). The mean recovery rate of a murine norovirus strain, which was inoculated into groundwater samples collected from a deep well, was the highest (39%) when the viral RNA was directly extracted from the membrane instead of eluting the adsorbed viral particles. This adsorption-direct extraction method was applied to groundwater samples (20 liters) collected from deep wells used for the public drinking water supply (n = 22) and private wells (n = 9). RVA (85 copies/liter) and NoV GII (35 copies/liter) were detected in water samples from a deep well and a private well, respectively. PMMoV was detected in 95% and 89% of water samples from deep wells and private wells, respectively, at concentrations of up to 990 copies/liter. The modified method was also used to extract bacterial DNA from the membrane (recovery rate of inoculated Escherichia coli K-12 was 22%). The Bacteroidales genetic markers specific to ruminants (BacR) and pigs (Pig2Bac) were detected in samples from a deep well and a private well, respectively. The modified virus concentration method has important implications for the management of microbiological safety in the groundwater supply. IMPORTANCE We investigated the presence of enteric viruses and bacterial genetic markers to determine fecal contamination in groundwater samples from deep wells used for the public drinking water supply and private wells in Japan. Groundwater is often subjected to chlorination; malfunctions in chlorine treatment result in waterborne disease outbreaks. The modified method successfully concentrated both viruses and bacteria in 20-liter groundwater samples. Norovirus genogroup II (GII), rotavirus A, Pepper mild mottle virus, and Bacteroidales genetic markers specific to ruminants and pigs were detected. Frequent flooding caused by increased incidences of extreme rainfall events promotes the infiltration of surface runoff containing livestock wastes and untreated wastewater into wells, possibly increasing groundwater contamination risk. The practical and efficient method developed in this study will enable waterworks and the environmental health departments of municipal/prefectural governments to monitor water quality. Additionally, the modified method will contribute to improving the microbiological safety of groundwater.
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Anderson-Coughlin BL, Shearer AEH, Omar AN, Wommack KE, Kniel KE. Recovery of SARS-CoV-2 from Wastewater Using Centrifugal Ultrafiltration. Methods Protoc 2021; 4:mps4020032. [PMID: 34065842 PMCID: PMC8162551 DOI: 10.3390/mps4020032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/03/2021] [Accepted: 05/08/2021] [Indexed: 01/13/2023] Open
Abstract
The COVID-19 pandemic is a global crisis and continues to impact communities as the disease spreads. Clinical testing alone provides a snapshot of infected individuals but is costly and difficult to perform logistically across whole populations. The virus which causes COVID-19, SARS-CoV-2, is shed in human feces and urine and can be detected in human waste. SARS-CoV-2 can be shed in high concentrations (>107 genomic copies/mL) due to its ability to replicate in the gastrointestinal tract of humans through attachment to the angiotensin-converting enzyme 2 (ACE-2) receptors there. Monitoring wastewater for SARS-CoV-2, alongside clinical testing, can more accurately represent the spread of disease within a community. This protocol describes a reliable and efficacious method to recover SARS-CoV-2 in wastewater, quantify genomic RNA levels, and evaluate concentration fluctuations over time. Using this protocol, viral levels as low as 10 genomic copies/mL were successfully detected from 30 mL of wastewater in more than seven-hundred samples collected between August 2020 and March 2021. Through the adaptation of traditional enteric virus methods used in food safety research, targets have been reliably detected with no inhibition of detection (RT-qPCR) observed in any sample processed. This protocol is currently used for surveillance of wastewater systems across New Castle County, Delaware.
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Affiliation(s)
- Brienna L. Anderson-Coughlin
- Center for Environmental and Wastewater-Based Epidemiological Research, Department of Animal and Food Sciences, University of Delaware, Newark, DE 19716, USA; (B.L.A.-C.); (A.E.H.S.); (A.N.O.)
| | - Adrienne E. H. Shearer
- Center for Environmental and Wastewater-Based Epidemiological Research, Department of Animal and Food Sciences, University of Delaware, Newark, DE 19716, USA; (B.L.A.-C.); (A.E.H.S.); (A.N.O.)
| | - Alexis N. Omar
- Center for Environmental and Wastewater-Based Epidemiological Research, Department of Animal and Food Sciences, University of Delaware, Newark, DE 19716, USA; (B.L.A.-C.); (A.E.H.S.); (A.N.O.)
| | - K. Eric Wommack
- Center for Environmental and Wastewater-Based Epidemiological Research, Department of Plant and Soil Sciences, University of Delaware, Newark, DE 19716, USA;
| | - Kalmia E. Kniel
- Center for Environmental and Wastewater-Based Epidemiological Research, Department of Animal and Food Sciences, University of Delaware, Newark, DE 19716, USA; (B.L.A.-C.); (A.E.H.S.); (A.N.O.)
- Correspondence:
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21
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Anand U, Adelodun B, Pivato A, Suresh S, Indari O, Jakhmola S, Jha HC, Jha PK, Tripathi V, Di Maria F. A review of the presence of SARS-CoV-2 RNA in wastewater and airborne particulates and its use for virus spreading surveillance. ENVIRONMENTAL RESEARCH 2021; 196:110929. [PMID: 33640498 PMCID: PMC7906514 DOI: 10.1016/j.envres.2021.110929] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 02/20/2021] [Accepted: 02/22/2021] [Indexed: 05/08/2023]
Abstract
According to the WHO, on October 16, 2020, the spreading of the SARS-CoV-2, responsible for the COVID-19 pandemic, reached 235 countries and territories, and resulting in more than 39 million confirmed cases and 1.09 million deaths globally. Monitoring of the virus outbreak is one of the main activities pursued to limiting the number of infected people and decreasing the number of deaths that have caused high pressure on the health care, social, and economic systems of different countries. Wastewater based epidemiology (WBE), already adopted for the surveillance of life style and health conditions of communities, shows interesting features for the monitoring of the COVID-19 diffusion. Together with wastewater, the analysis of airborne particles has been recently suggested as another useful tool for detecting the presence of SARS-CoV-2 in given areas. The present review reports the status of research currently performed concerning the monitoring of SARS-CoV-2 spreading by WBE and airborne particles. The former have been more investigated, whereas the latter is still at a very early stage, with a limited number of very recent studies. Nevertheless, the main results highlights in both cases necessitate more research activity for better understating and defining the biomarkers and the related sampling and analysis procedures to be used for this important aim.
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Affiliation(s)
- Uttpal Anand
- Department of Life Sciences, National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel
| | - Bashir Adelodun
- Department of Agricultural and Biosystems Engineering, University of Ilorin, PMB 1515, Ilorin, Nigeria; Department of Agricultural Civil Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Alberto Pivato
- DICEA - Department of Civil, Environmental and Architectural Engineering, University of Padova, Via Marzolo 9, 35131, Padova, Italy
| | - S Suresh
- Department of Chemical Engineering, Maulana Azad National Institute of Technology, Bhopal, 462 003, Madhya Pradesh, India
| | - Omkar Indari
- Discipline of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, 453552, Indore, Madhya Pradesh, India
| | - Shweta Jakhmola
- Discipline of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, 453552, Indore, Madhya Pradesh, India
| | - Hem Chandra Jha
- Discipline of Biosciences and Biomedical Engineering, Indian Institute of Technology Indore, 453552, Indore, Madhya Pradesh, India
| | - Pawan Kumar Jha
- Centre for Environmental Studies, University of Allahabad, Prayagraj, 211002, Uttar Pradesh, India
| | - Vijay Tripathi
- Department of Molecular and Cellular Engineering, Jacob Institute of Biotechnology and Bioengineering, Sam Higginbottom University of Agriculture, Technology and Sciences, Prayagraj, 211007, Uttar Pradesh, India.
| | - Francesco Di Maria
- LAR(5) Laboratory - Dipartimento di Ingegneria - University of Perugia, via G. Duranti 93, 06125, Perugia, Italy.
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22
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Irbe I, Filipova I, Skute M, Zajakina A, Spunde K, Juhna T. Characterization of Novel Biopolymer Blend Mycocel from Plant Cellulose and Fungal Fibers. Polymers (Basel) 2021; 13:polym13071086. [PMID: 33808067 PMCID: PMC8037894 DOI: 10.3390/polym13071086] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 03/23/2021] [Accepted: 03/25/2021] [Indexed: 12/17/2022] Open
Abstract
In this study unique blended biopolymer mycocel from naturally derived biomass was developed. Softwood Kraft (KF) or hemp (HF) cellulose fibers were mixed with fungal fibers (FF) in different ratios and the obtained materials were characterized regarding microstructure, air permeability, mechanical properties, and virus filtration efficiency. The fibers from screened Basidiomycota fungi Ganoderma applanatum (Ga), Fomes fomentarius (Ff), Agaricus bisporus (Ab), and Trametes versicolor (Tv) were applicable for blending with cellulose fibers. Fungi with trimitic hyphal system (Ga, Ff) in combinations with KF formed a microporous membrane with increased air permeability (>8820 mL/min) and limited mechanical strength (tensile index 9–14 Nm/g). HF combination with trimitic fungal hyphae formed a dense fibrillary net with low air permeability (77–115 mL/min) and higher strength 31–36 Nm/g. The hyphal bundles of monomitic fibers of Tv mycelium and Ab stipes made a tight structure with KF with increased strength (26–43 Nm/g) and limited air permeability (14–1630 mL/min). The blends KF FF (Ga) and KF FF (Tv) revealed relatively high virus filtration capacity: the log10 virus titer reduction values (LRV) corresponded to 4.54 LRV and 2.12 LRV, respectively. Mycocel biopolymers are biodegradable and have potential to be used in water microfiltration, food packaging, and virus filtration membranes.
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Affiliation(s)
- Ilze Irbe
- Latvian State Institute of Wood Chemistry, Dzerbenes 27, LV-1006 Riga, Latvia; (I.F.); (M.S.)
- Correspondence: (I.I.); (A.Z.)
| | - Inese Filipova
- Latvian State Institute of Wood Chemistry, Dzerbenes 27, LV-1006 Riga, Latvia; (I.F.); (M.S.)
| | - Marite Skute
- Latvian State Institute of Wood Chemistry, Dzerbenes 27, LV-1006 Riga, Latvia; (I.F.); (M.S.)
| | - Anna Zajakina
- Latvian Biomedical Research and Study Centre, Ratsupites 1 k. 1, LV-1067 Riga, Latvia;
- Correspondence: (I.I.); (A.Z.)
| | - Karina Spunde
- Latvian Biomedical Research and Study Centre, Ratsupites 1 k. 1, LV-1067 Riga, Latvia;
| | - Talis Juhna
- Water Research and Environmental Biotechnology Laboratory, Riga Technical University, P. Valdena 1-303, LV-1048 Riga, Latvia;
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23
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Gu X, Zhai H, Cheng S. Fate of antibiotics and antibiotic resistance genes in home water purification systems. WATER RESEARCH 2021; 190:116762. [PMID: 33387948 DOI: 10.1016/j.watres.2020.116762] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/29/2020] [Accepted: 12/17/2020] [Indexed: 06/12/2023]
Abstract
Home water purification systems (HWPSs) are utilized worldwide to obtain clean drinking water. However, the reliability of HWPSs in providing safe water is unknown or not well-proven. In this study, the occurrences of antibiotics and antibiotic resistance genes (ARGs) in tap water, effluents, and filters of HWPSs were investigated in twenty-six houses and one laboratory. The levels of antibiotics and ARGs were between less than the limit of detection (LOD) and 7.9 ng/L and between less than LOD and 3.45 × 105 copies/L, respectively, in tap water. HWPSs with fresh filters had a high efficiency in removing antibiotics and ARGs, with removal rates of 91-92% and 0.46-2.43 log, respectively. However, after long-term operation (e.g., more than three months), some HWPSs had low removal rates of antibiotics and ARGs (3-79% and 0.03-0.15 log, respectively) and some HWPSs released antibiotics and ARGs into the effluents leading to higher levels of antibiotics and ARGs in the effluents than those in the influents. Biofilms were observed on many filters of the investigated HWPSs. ARGs were detected on the filters with relative abundances (the ratio of the abundance of ARGs to the abundance of 16S rRNA) of 2.56 × 10-8-2.89 × 10-2. High-throughput sequencing analysis showed that Proteobacteria, Acidobacteria, Chloroflexi, and Bacteroidetes were the dominant phyla, and Alphaproteobacteria and Gammaproteobacteria were the dominant classes. The abundances of Cyanobacteria, Patescibacteria, Bacteroidetes, and Proteobacteria were significantly positively correlated with the abundances of ARGs. Microbial growth and enrichment commonly observed in HWPSs can accelerate the exposure risk posed by antibiotics and ARGs to the consumers of water from these appliances.
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Affiliation(s)
- Xin Gu
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
| | - Hongyan Zhai
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China.
| | - Shengzi Cheng
- School of Environmental Science and Engineering, Tianjin University, Weijin Road 92, Tianjin, 300072, China
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24
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Lesimple A, Jasim SY, Johnson DJ, Hilal N. The role of wastewater treatment plants as tools for SARS-CoV-2 early detection and removal. JOURNAL OF WATER PROCESS ENGINEERING 2020; 38:101544. [PMID: 38620686 PMCID: PMC7377730 DOI: 10.1016/j.jwpe.2020.101544] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 07/16/2020] [Accepted: 07/20/2020] [Indexed: 05/03/2023]
Abstract
The world is facing the third coronavirus caused pandemic in less than twenty years. The SARS-CoV-2 virus not only affects the human respiratory system, but also the gastrointestinal tract. The virus has been found in human feces, in sewage and in wastewater treatment plants. It has the potential to become a panzootic disease, as it is now proven that several mammalian species become infected. Since it has been shown that the virus can be detected in sewage even before the onset of symptoms in the local population, Wastewater Based Epidemiology should be developed not only to localize infection clusters of the primary wave but also to detect a potential second, or subsequent, wave. To prevent a panzootic, virus removal techniques from wastewater need to be implemented to prevent the virus dissemination into the environment. In that context, this review presents recent improvements in all the fields of wastewater treatment from treatment ponds to the use of algae or nanomaterials with a particular emphasis on membrane-based techniques.
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Affiliation(s)
- Alain Lesimple
- NYUAD Water Research Center, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates
| | - Saad Y Jasim
- SJ Environmental Consultants (Windsor) Inc., 4483 Cherry Hill Road, Windsor, Ontario, N9G 2W3 Canada
| | - Daniel J Johnson
- Centre for Water Advanced Technologies and Environmental Research (CWATER), College of Engineering, Swansea University, Fabian Way, Swansea SA1 8EN, United Kingdom
| | - Nidal Hilal
- NYUAD Water Research Center, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates
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25
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Balderrama-Carmona AP, Silva-Beltrán NP, Gálvez-Ruiz JC, Ruíz-Cruz S, Chaidez-Quiroz C, Morán-Palacio EF. Antiviral, Antioxidant, and Antihemolytic Effect of Annona muricata L. Leaves Extracts. PLANTS (BASEL, SWITZERLAND) 2020; 9:plants9121650. [PMID: 33256023 PMCID: PMC7760998 DOI: 10.3390/plants9121650] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2020] [Revised: 11/16/2020] [Accepted: 11/16/2020] [Indexed: 05/20/2023]
Abstract
Annona muricata L. is a tropical tree that is used in traditional medicine around the world. The high content of flavonoid, alkaloid, acetogenin, phenolic and lipophilic compounds of this tropical tree forms the basis of its traditional medical uses. Our objective was to study soursop leaf extracts to support their use as antiviral therapies and investigate their protective effects against oxidative damage. The aqueous extract (AE) and acidified ethanolic extract (AEE) of soursop leaves were characterized by ultra performance liquid chromatography (UPLC), and their effects on human erythrocytes and in vitro antioxidant capacity, as evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assays, were investigated. The antiviral effects were evaluated using a bacteriophage surrogate. AEE showed the highest phenolic content, with rutin as the predominant compound. This extract showed higher values in the DPPH and ABTS assays, with 23.61 ± 0.42 and 24.91 ± 0.16 mmol of Trolox equivalent per gram, respectively. Inhibition of hemolysis was 34% and 51% for AE and AEE, respectively. AEE was selected for the antiviral study because of its higher antioxidant activity. The viral reduction ranged from 5-6 log10 plaque-forming units/volume (PFU) at contact times of 15-360 min. Soursop leaves have a positive effect on reducing oxidative stress in human erythrocytes and viral infections.
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Affiliation(s)
- Ana Paola Balderrama-Carmona
- Departamento de Ciencias Químico Biológicas y Agropecuarias, Universidad de Sonora, Unidad Regional Sur, Navojoa, Sonora 85880, Mexico; (A.P.B.-C.); (E.F.M.-P.)
| | - Norma Patricia Silva-Beltrán
- Departamento de Ciencias de la Salud, Campus Cajeme, Universidad de Sonora, Ejido Providencia, Cd, Obregón, Sonora 85050, Mexico
- Correspondence: ; Tel.: +52-644-410-5270
| | - Juan-Carlos Gálvez-Ruiz
- Departamento de Ciencias Químicas Biológicas, Universidad de Sonora, Hermosillo, Sonora 83000, Mexico;
| | - Saúl Ruíz-Cruz
- Departamento de Biotecnología y Ciencias Alimentarias, Instituto Tecnológico de Sonora, Cajeme, Sonora 85000, Mexico;
| | - Cristóbal Chaidez-Quiroz
- Centro de Investigación en Alimentación y Desarrollo A.C., Laboratorio Nacional para la Investigación en Inocuidad Alimentaria, Culiacán, Sinaloa 80110, Mexico;
| | - Edgar Felipe Morán-Palacio
- Departamento de Ciencias Químico Biológicas y Agropecuarias, Universidad de Sonora, Unidad Regional Sur, Navojoa, Sonora 85880, Mexico; (A.P.B.-C.); (E.F.M.-P.)
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26
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Shirasaki N, Matsushita T, Matsui Y, Koriki S. Suitability of pepper mild mottle virus as a human enteric virus surrogate for assessing the efficacy of thermal or free-chlorine disinfection processes by using infectivity assays and enhanced viability PCR. WATER RESEARCH 2020; 186:116409. [PMID: 32942179 DOI: 10.1016/j.watres.2020.116409] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 09/02/2020] [Accepted: 09/06/2020] [Indexed: 05/05/2023]
Abstract
Evaluating the efficacy of disinfection processes to inactivate human enteric viruses is important for the prevention and control of waterborne diseases caused by exposure to those viruses via drinking water. Here, we evaluated the inactivation of two representative human enteric viruses (adenovirus type 40 [AdV] and coxsackievirus B5 [CV]) by thermal or free-chlorine disinfection. In addition, we compared the infectivity reduction ratio of a plant virus (pepper mild mottle virus [PMMoV], a recently proposed novel surrogate for human enteric viruses for the assessment of virus removal by coagulation‒rapid sand filtration and membrane filtration) with that of the two human enteric viruses to assess the suitability of PMMoV as a human enteric virus surrogate for use in thermal and free-chlorine disinfection processes. Finally, we examined whether conventional or enhanced viability polymerase chain reaction (PCR) analysis using propidium monoazide (PMA) or improved PMA (PMAxx) with or without an enhancer could be used as alternatives to infectivity assays (i.e., plaque-forming unit method for AdV and CV; local lesion count assay for PMMoV) for evaluating virus inactivation by disinfection processes. We found that PMMoV was more resistant to heat treatment than AdV and CV, suggesting that PMMoV is a potential surrogate for these two enteric viruses with regard to thermal disinfection processes. However, PMMoV was much more resistant to chlorine treatment compared with AdV and CV (which is chlorine-resistant) (CT value for 4-log10 inactivation: PMMoV, 84.5 mg-Cl2·min/L; CV, 1.15-1.19 mg-Cl2·min/L), suggesting that PMMoV is not useful as a surrogate for these enteric viruses with regard to free-chlorine disinfection processes. For thermal disinfection, the magnitude of the signal reduction observed with PMAxx-Enhancer-PCR was comparable with the magnitude of reduction in infectivity, indicating that PMAxx-Enhancer-PCR is a potential alternative to infectivity assay. However, for free-chlorine disinfection, the magnitude of the signal reduction observed with PMAxx-Enhancer-PCR was smaller than the magnitude of the reduction in infectivity, indicating that PMAxx-Enhancer-PCR underestimated the efficacy of virus inactivation (i.e., overestimated the infectious virus concentration) by chlorine treatment. Nevertheless, among the PCR approaches examined in the present study (PCR alone, PMA-PCR or PMAxx-PCR either with or without enhancer), PMAxx-Enhancer-PCR provided the most accurate assessment of the efficacy of virus inactivation by thermal or free chlorine disinfection processes.
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Affiliation(s)
- N Shirasaki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan.
| | - T Matsushita
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
| | - Y Matsui
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
| | - S Koriki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo, 060-8628, Japan
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27
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Morrison CM, Betancourt WQ, Quintanar DR, Lopez GU, Pepper IL, Gerba CP. Potential indicators of virus transport and removal during soil aquifer treatment of treated wastewater effluent. WATER RESEARCH 2020; 177:115812. [PMID: 32311575 DOI: 10.1016/j.watres.2020.115812] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 04/06/2020] [Accepted: 04/08/2020] [Indexed: 05/03/2023]
Abstract
Increased water demands have led to a notable interest in the use of treated wastewater for reuse. Typically, this results from the implementation of advanced treatment of final effluent from wastewater treatment plants prior to reuse for potable or non-potable purposes. Soil aquifer treatment (SAT) is a natural treatment process in which water from sources of varying quality is infiltrated into the soil to further improve its quality. The goal of this study was to determine the log10 reduction values (LRVs) of viruses naturally present in treated effluent and evaluate two potential indicators of virus removal and transport, pepper mild mottle virus (PMMoV) and crAssphage, during SAT of treated effluent. Groundwater was sampled at three wells with different attributes within the Sweetwater Recharge Facility (SWRF) in Tucson, AZ. These sites vary greatly in operational parameters such as effluent infiltration rates and wetting/drying cycles, which may influence virus removal efficiency. Detection of adenovirus, enterovirus, PMMoV, and crAssphage were determined by qPCR/RT-qPCR and log10 reduction values (LRVs) were determined. PMMoV and crAssphage were detected in groundwater associated with a set of recharge basins that exhibited shorter wetting/drying cycles and faster infiltration rates. LRVs for crAssphage and PMMoV at this site ranged from 3.9 to 5.8, respectively. Moreover, PMMoV was detected downflow of the SAT sites, indicating the potential degradation of microbial groundwater quality in the region surrounding managed aquifer recharge facilities. Overall, PMMoV and crAssphage showed potential as conservative process indicators of virus removal during SAT, particularly for attribution of LRV credits. Moreover, the detection of these viruses indicated the potential influence of wetting/drying cycles on virus removal by SAT, a parameter that has not yet been studied with respect to biological contaminants.
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Affiliation(s)
- Christina M Morrison
- Department of Environmental Science, Water and Energy Sustainable Technology (WEST) Center University of Arizona, Tucson, AZ, USA.
| | - Walter Q Betancourt
- Department of Environmental Science, Water and Energy Sustainable Technology (WEST) Center University of Arizona, Tucson, AZ, USA
| | | | - Gerardo U Lopez
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
| | - Ian L Pepper
- Department of Environmental Science, Water and Energy Sustainable Technology (WEST) Center University of Arizona, Tucson, AZ, USA
| | - Charles P Gerba
- Department of Environmental Science, Water and Energy Sustainable Technology (WEST) Center University of Arizona, Tucson, AZ, USA
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28
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Analysis of microbial contamination of household water purifiers. Appl Microbiol Biotechnol 2020; 104:4533-4545. [PMID: 32193577 DOI: 10.1007/s00253-020-10510-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 02/13/2020] [Accepted: 02/28/2020] [Indexed: 12/19/2022]
Abstract
Household water purifiers are increasingly used to treat drinking water at the household level, but their influence on the microbiological safety of drinking water has rarely been assessed. In this study, representative purifiers, based on different filtering processes, were analyzed for their impact on effluent water quality. The results showed that purifiers reduced chemical qualities such as turbidity and free chlorine. However, a high level of bacteria (102-106 CFU/g) was detected at each stage of filtration using a traditional culture-dependent method, whereas quantitative PCR with propidium monoazide (PMA) treatment showed 106-108 copies/L of total viable bacteria in effluent water, indicating elevated microbial contaminants after purifiers. In addition, high-throughput sequencing revealed a diverse microbial community in effluents and membranes. Proteobacteria (22.06-97.42%) was the dominant phylum found in all samples, except for purifier B, in which Melainabacteria was most abundant (65.79%). For waterborne pathogens, Escherichia coli (100-106 copies/g) and Pseudomonas aeruginosa (100-105 copies/g) were frequently detected by qPCR. Sequencing also demonstrated the presence of E. coli (0-6.26%), Mycobacterium mucogenicum (0.01-3.46%), and P. aeruginosa (0-0.16%) in purifiers. These finding suggest that water from commonly used household purifiers still impose microbial risks to human health.
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29
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Im D, Nakada N, Kato Y, Aoki M, Tanaka H. Pretreatment of ceramic membrane microfiltration in wastewater reuse: A comparison between ozonation and coagulation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 251:109555. [PMID: 31539697 DOI: 10.1016/j.jenvman.2019.109555] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 08/28/2019] [Accepted: 09/07/2019] [Indexed: 06/10/2023]
Abstract
To determine the most efficient pretreatment for ceramic membrane filtration (CMF) of primary clarifier effluent (PE), the effectiveness of ozonation and coagulation was investigated from the viewpoint of both virus removal and mitigation of membrane fouling. Our results showed virus removal by coagulation to be more efficient as a CMF pretreatment, whereas ozonation showed better efficiency when used as a CMF posttreatment. The effect of ozonation and coagulation on ceramic membrane fouling was investigated during short-term operation. With the use of coagulation before CMF (PACl + CMF), irreversible fouling resistance was 0.5 × 1011 m-1 at a dosage of 150 mg/L of polyaluminum chloride (PACl), which was 10 times lower than when ozonation was used as a pretreatment to CMF (O3+CMF) (0.7 × 1012 m-1 at 50 mg-O3/L). This result indicates coagulation to be more efficient than ozonation for mitigating ceramic membrane fouling. Based on these results, the process sustainability of PACl + CMF was then investigated during longer-term operation. At a dosage of 150 mg/L of PACl, the PACl + CMF process could be sustainably operated for 120 h without any need for chemically enhanced backwashing, which was twice as long as for PACl dosages of 50 and 100 mg/L. Coagulation is thus a more efficient pretreatment for CMF of PE from the viewpoint of both virus removal and mitigation of ceramic membrane fouling. The hygienic safety of reclaimed water can be further improved if ozonation is used as a CMF posttreatment.
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Affiliation(s)
- Dongbum Im
- Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, 1-2 Yumihama, Otsu, Shiga, 520-0811, Japan.
| | - Norihide Nakada
- Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, 1-2 Yumihama, Otsu, Shiga, 520-0811, Japan
| | - Yasuhiro Kato
- Metawater Co., Ltd., 7 Yawatakaigandori, Ichihara, Chiba, 290-8511, Japan
| | - Michiko Aoki
- Metawater Co., Ltd., 7 Yawatakaigandori, Ichihara, Chiba, 290-8511, Japan
| | - Hiroaki Tanaka
- Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, 1-2 Yumihama, Otsu, Shiga, 520-0811, Japan
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30
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Han B, Wang X, Zheng J, Liang S, Xiao K, Yu J, Qian Z, Huang X. Determination of Surface Energy Parameters of Hydrophilic Porous Membranes via a Corrected Contact Angle Approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15009-15016. [PMID: 31671941 DOI: 10.1021/acs.langmuir.9b02508] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
While the contact angle is a well-applied indicator of membrane hydrophobicity and surface energy, the interference of surface roughness and porosity in contact angle measurement and surface energy calculation has been long neglected in the field of porous membrane study. We propose an improved method to straightforwardly derive the surface energy of the porous membrane from contact angles with the interference effect corrected. A linearized model was established combining the Young-Dupré and Cassie-Baxter equations, from which the surface energy (Lifshitz-van der Waals and Lewis acid/base components) and roughness index (surface area difference) can be solved simultaneously at a given porosity using contact angles measured with a set of standard polar/nonpolar test liquids. The model solution was examined using hydrophilic microfiltration membranes with different pore morphologies (including perforated plate-like PCTE, irregular particulate bed-like PVDF, and fibrous mesh-like PTFE membranes), with the robustness of the results evaluated via Monte Carlo simulation. In comparison with the verified results of the model solution, it was found that the Lifshitz-van der Waals Lewis acid/base energy values for the tested membranes would deviate by 50-87, 30-160, and 52-97%, respectively, if surface roughness and porosity were neglected in the calculation. The profound effect of roughness and porosity on surface energy determination was further confirmed via theoretical analysis of the Young-Dupré and Cassie-Baxter relationships. This improved approach may apply to the surface energy characterization of hydrophilic rough porous membranes (e.g., hydrophilic microfiltration membranes).
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Affiliation(s)
- Bingjun Han
- College of Resources and Environment , University of Chinese Academy of Sciences , Beijing 100049 , Beijing , China
| | | | - Jianzhong Zheng
- College of Resources and Environment , University of Chinese Academy of Sciences , Beijing 100049 , Beijing , China
| | - Shuai Liang
- College of Environmental Science and Engineering , Beijing Forestry University , Beijing 100083 , Beijing , China
| | - Kang Xiao
- College of Resources and Environment , University of Chinese Academy of Sciences , Beijing 100049 , Beijing , China
| | - Jinlan Yu
- College of Resources and Environment , University of Chinese Academy of Sciences , Beijing 100049 , Beijing , China
| | - Zhi Qian
- College of Resources and Environment , University of Chinese Academy of Sciences , Beijing 100049 , Beijing , China
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31
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Fujioka T, Boivin S. Assessing the passage of particles through polyamide reverse osmosis membranes. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2019.05.076] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Lee S, Yamashita N, Tanaka H. How Fiber Breakage Reduces Microorganism Removal in Ultrafiltration for Wastewater Reclamation. FOOD AND ENVIRONMENTAL VIROLOGY 2019; 11:167-177. [PMID: 30756312 DOI: 10.1007/s12560-019-09372-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 01/30/2019] [Indexed: 06/09/2023]
Abstract
Ultrafiltration (UF) membranes are increasingly being used for wastewater reclamation treatment for their high removal of pathogens and suspended solids. However, breakage of UF membrane fibers could allow leakage of pathogens into the permeate and create health risks in the use of reclaimed water. Here, we assessed the log10 reduction value (LRV) of human enteric viruses and microbial indicators of new and aged UF modules in a pilot-scale UF process to evaluate the influence of fiber breakage. Norovirus genotypes I and II, Aichi virus, and Escherichia coli were not detected in any permeate samples of intact UF modules, but were detected in samples of damaged UF modules. LRVs of all microorganisms assayed decreased as fiber breakage of new UF modules increased, with maximum decreases of > 3.3 log10. Fiber breakage in the aged UF modules did not decrease LRVs of somatic coliphages and MS2, but breakage in the new UF modules did decrease them. Intact new UF modules gave higher LRVs than intact aged UF modules. When the LRV of intact UF module was assumed to be 1 or 2 log10, increasing fiber breakage did not significantly decrease the predicted LRV, but when it was ≥ 3 log10, it did decrease LRV, in good agreement with measured LRVs in the degraded UF modules. These results suggest that the LRV of intact UF modules affects the decrease in LRV and confirm the leakage of human enteric viruses following fiber breakage in UF modules of different ages in the UF process of wastewater reclamation.
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Affiliation(s)
- Suntae Lee
- Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, 1-2 Yumihama, Otsu, Shiga, 520-0811, Japan.
- Innovative Materials and Resources Research Center, Public Works Research Institute, 1-6 Minamihara, Tsukuba, Ibaraki, 305-8516, Japan.
| | - Naoyuki Yamashita
- Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, 1-2 Yumihama, Otsu, Shiga, 520-0811, Japan
| | - Hiroaki Tanaka
- Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, 1-2 Yumihama, Otsu, Shiga, 520-0811, Japan
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33
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Symonds EM, Nguyen KH, Harwood VJ, Breitbart M. Pepper mild mottle virus: A plant pathogen with a greater purpose in (waste)water treatment development and public health management. WATER RESEARCH 2018; 144:1-12. [PMID: 30005176 PMCID: PMC6162155 DOI: 10.1016/j.watres.2018.06.066] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 06/26/2018] [Accepted: 06/28/2018] [Indexed: 05/06/2023]
Abstract
An enteric virus surrogate and reliable domestic wastewater tracer is needed to manage microbial quality of food and water as (waste)water reuse becomes more prevalent in response to population growth, urbanization, and climate change. Pepper mild mottle virus (PMMoV), a plant pathogen found at high concentrations in domestic wastewater, is a promising surrogate for enteric viruses that has been incorporated into over 29 water- and food-related microbial quality and technology investigations around the world. This review consolidates the available literature from across disciplines to provide guidance on the utility of PMMoV as either an enteric virus surrogate and/or domestic wastewater marker in various situations. Synthesis of the available research supports PMMoV as a useful enteric virus process indicator since its high concentrations in source water allow for identifying the extent of virus log-reductions in field, pilot, and full-scale (waste)water treatment systems. PMMoV reduction levels during many forms of wastewater treatment were less than or equal to the reduction of other viruses, suggesting this virus can serve as an enteric virus surrogate when evaluating new treatment technologies. PMMoV excels as an index virus for enteric viruses in environmental waters exposed to untreated domestic wastewater because it was detected more frequently and in higher concentrations than other human viruses in groundwater (72.2%) and surface waters (freshwater, 94.5% and coastal, 72.2%), with pathogen co-detection rates as high as 72.3%. Additionally, PMMoV is an important microbial source tracking marker, most appropriately associated with untreated domestic wastewater, where its pooled-specificity is 90% and pooled-sensitivity is 100%, as opposed to human feces where its pooled-sensitivity is only 11.3%. A limited number of studies have also suggested that PMMoV may be a useful index virus for enteric viruses in monitoring the microbial quality of fresh produce and shellfish, but further research is needed on these topics. Finally, future work is needed to fill in knowledge gaps regarding PMMoV's global specificity and sensitivity.
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Affiliation(s)
- E M Symonds
- University of South Florida, College of Marine Science, 140 7th Avenue South, St. Petersburg, FL, USA.
| | - Karena H Nguyen
- University of South Florida, Department of Integrative Biology, 4202 E. Fowler Avenue, Tampa, FL, USA.
| | - V J Harwood
- University of South Florida, Department of Integrative Biology, 4202 E. Fowler Avenue, Tampa, FL, USA.
| | - M Breitbart
- University of South Florida, College of Marine Science, 140 7th Avenue South, St. Petersburg, FL, USA.
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Transfer of Enteric Viruses Adenovirus and Coxsackievirus and Bacteriophage MS2 from Liquid to Human Skin. Appl Environ Microbiol 2018; 84:AEM.01809-18. [PMID: 30217840 PMCID: PMC6210118 DOI: 10.1128/aem.01809-18] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 09/05/2018] [Indexed: 11/23/2022] Open
Abstract
Enteric viruses (viruses that infect the gastrointestinal tract) are responsible for most water-transmitted diseases. They are shed in high concentrations in the feces of infected individuals, persist for an extended period of time in water, and are highly infective. Exposure to contaminated water directly (through ingestion) or indirectly (for example, through hand-water contacts followed by hand-to-mouth contacts) increases the risk of virus transmission. The work described herein provides a quantitative model for estimating human-pathogenic virus retention on skin following contact with contaminated water. The work will be important in refining the contribution of indirect transmission of virus to risks associated with water-related activities. Indirect exposure to waterborne viruses increases the risk of infection, especially among children with frequent hand-to-mouth contacts. Here, we quantified the transfer of one bacteriophage (MS2) and two enteric viruses (adenovirus and coxsackievirus) from liquid to skin. MS2, a commonly used enteric virus surrogate, was used to compare virus transfer rates in a volunteer trial to those obtained using human cadaver skin and synthetic skin. MS2 transfer to volunteer skin was similar to transfer to cadaver skin but significantly different from transfer to synthetic skin. The transfer of MS2, adenovirus, and coxsackievirus to cadaver skin was modeled using measurements for viruses attaching to the skin (adsorbed) and viruses in liquid residual on skin (unadsorbed). We find virus transfer per surface area is a function of the concentration of virus in the liquid and the film thickness of liquid retained on the skin and is estimable using a linear model. Notably, the amount of MS2 adsorbed on the skin was on average 5 times higher than the amount of adenovirus and 4 times higher than the amount of coxsackievirus. Quantification of pathogenic virus retention to skin would thus be overestimated using MS2 adsorption data. This study provides models of virus transfer useful for risk assessments of water-related activities, demonstrates significant differences in the transfer of pathogenic virus and MS2, and suggests cadaver skin as an alternative testing system for studying interactions between viruses and skin. IMPORTANCE Enteric viruses (viruses that infect the gastrointestinal tract) are responsible for most water-transmitted diseases. They are shed in high concentrations in the feces of infected individuals, persist for an extended period of time in water, and are highly infective. Exposure to contaminated water directly (through ingestion) or indirectly (for example, through hand-water contacts followed by hand-to-mouth contacts) increases the risk of virus transmission. The work described herein provides a quantitative model for estimating human-pathogenic virus retention on skin following contact with contaminated water. The work will be important in refining the contribution of indirect transmission of virus to risks associated with water-related activities.
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Virus reduction through microfiltration membranes modified with a cationic polymer for drinking water applications. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.04.056] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Kato R, Asami T, Utagawa E, Furumai H, Katayama H. Pepper mild mottle virus as a process indicator at drinking water treatment plants employing coagulation-sedimentation, rapid sand filtration, ozonation, and biological activated carbon treatments in Japan. WATER RESEARCH 2018; 132:61-70. [PMID: 29306700 DOI: 10.1016/j.watres.2017.12.068] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 12/13/2017] [Accepted: 12/23/2017] [Indexed: 05/12/2023]
Abstract
To assess the potential of pepper mild mottle virus (PMMoV) as a viral process indicator, its reduction through coagulation-sedimentation (CS) and rapid sand filtration (RSF) were compared with those of Escherichia coli, previously used viral indicators, and norovirus genotype II (NoV GII; enteric virus reference pathogen) in a bench-scale experiment. PMMoV log10 reductions in CS (1.96 ± 0.30) and RSF (0.26 ± 0.38) were similar to those of NoV GII (1.86 ± 0.61 and 0.28 ± 0.46). PMMoV, the most abundant viruses in the raw water, was also determined during CS, RSF, and advanced treatment processes at two full-scale drinking water treatment plants under strict turbidity management over a 13-month period. PMMoV was concentrated from large-volume water samples (10-614 L) and quantified by Taqman-based quantitative polymerase chain reaction. The PMMoV log10 reduction in CS (2.38 ± 0.74, n = 13 and 2.63 ± 0.76, n = 10 each for Plant A and B) and in ozonation (1.91 ± 1.18, n = 5, Plant A) greatly contributed to the overall log10 reduction. Our results suggest that PMMoV can act as a useful treatment process indicator of enteric viruses and can be used to monitor the log10 reduction of individual treatment processes at drinking water treatment plants due to its high and consistent copy numbers in source water.
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Affiliation(s)
- Ryuichi Kato
- Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tatsuya Asami
- Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Etsuko Utagawa
- Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hiroaki Furumai
- Research Center for Water Environment Technology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hiroyuki Katayama
- Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan; Vietnam - Japan University, Luu Huu Phuoc Str., My Dinh I Ward, Nam Tu Liem Dist., Hanoi, Viet Nam.
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Survival of viral pathogens in animal feed ingredients under transboundary shipping models. PLoS One 2018; 13:e0194509. [PMID: 29558524 PMCID: PMC5860775 DOI: 10.1371/journal.pone.0194509] [Citation(s) in RCA: 115] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 02/20/2018] [Indexed: 11/19/2022] Open
Abstract
The goal of this study was to evaluate survival of important viral pathogens of livestock in animal feed ingredients imported daily into the United States under simulated transboundary conditions. Eleven viruses were selected based on global significance and impact to the livestock industry, including Foot and Mouth Disease Virus (FMDV), Classical Swine Fever Virus (CSFV), African Swine Fever Virus (ASFV), Influenza A Virus of Swine (IAV-S), Pseudorabies virus (PRV), Nipah Virus (NiV), Porcine Reproductive and Respiratory Syndrome Virus (PRRSV), Swine Vesicular Disease Virus (SVDV), Vesicular Stomatitis Virus (VSV), Porcine Circovirus Type 2 (PCV2) and Vesicular Exanthema of Swine Virus (VESV). Surrogate viruses with similar genetic and physical properties were used for 6 viruses. Surrogates belonged to the same virus families as target pathogens, and included Senecavirus A (SVA) for FMDV, Bovine Viral Diarrhea Virus (BVDV) for CSFV, Bovine Herpesvirus Type 1 (BHV-1) for PRV, Canine Distemper Virus (CDV) for NiV, Porcine Sapelovirus (PSV) for SVDV and Feline Calicivirus (FCV) for VESV. For the remaining target viruses, actual pathogens were used. Virus survival was evaluated using Trans-Pacific or Trans-Atlantic transboundary models involving representative feed ingredients, transport times and environmental conditions, with samples tested by PCR, VI and/or swine bioassay. SVA (representing FMDV), FCV (representing VESV), BHV-1 (representing PRV), PRRSV, PSV (representing SVDV), ASFV and PCV2 maintained infectivity during transport, while BVDV (representing CSFV), VSV, CDV (representing NiV) and IAV-S did not. Notably, more viruses survived in conventional soybean meal, lysine hydrochloride, choline chloride, vitamin D and pork sausage casings. These results support published data on transboundary risk of PEDV in feed, demonstrate survival of certain viruses in specific feed ingredients ("high-risk combinations") under conditions simulating transport between continents and provide further evidence that contaminated feed ingredients may represent a risk for transport of pathogens at domestic and global levels.
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Shirasaki N, Matsushita T, Matsui Y, Yamashita R. Evaluation of the suitability of a plant virus, pepper mild mottle virus, as a surrogate of human enteric viruses for assessment of the efficacy of coagulation-rapid sand filtration to remove those viruses. WATER RESEARCH 2018; 129:460-469. [PMID: 29182907 DOI: 10.1016/j.watres.2017.11.043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 11/15/2017] [Accepted: 11/20/2017] [Indexed: 05/03/2023]
Abstract
Here, we evaluated the removal of three representative human enteric viruses - adenovirus (AdV) type 40, coxsackievirus (CV) B5, and hepatitis A virus (HAV) IB - and one surrogate of human caliciviruses - murine norovirus (MNV) type 1 - by coagulation-rapid sand filtration, using water samples from eight water sources for drinking water treatment plants in Japan. The removal ratios of a plant virus (pepper mild mottle virus; PMMoV) and two bacteriophages (MS2 and φX174) were compared with the removal ratios of human enteric viruses to assess the suitability of PMMoV, MS2, and φX174 as surrogates for human enteric viruses. The removal ratios of AdV, CV, HAV, and MNV, evaluated via the real-time polymerase chain reaction (PCR) method, were 0.8-2.5-log10 when commercially available polyaluminum chloride (PACl, basicity 1.5) and virgin silica sand were used as the coagulant and filter medium, respectively. The type of coagulant affected the virus removal efficiency, but the age of silica sand used in the rapid sand filtration did not. Coagulation-rapid sand filtration with non-sulfated, high-basicity PACls (basicity 2.1 or 2.5) removed viruses more efficiently than the other aluminum-based coagulants. The removal ratios of MS2 were sometimes higher than those of the three human enteric viruses and MNV, whereas the removal ratios of φX174 tended to be smaller than those of the three human enteric viruses and MNV. In contrast, the removal ratios of PMMoV were similar to and strongly correlated with those of the three human enteric viruses and MNV. Thus, PMMoV appears to be a suitable surrogate for human enteric viruses for the assessment of the efficacy of coagulation-rapid sand filtration to remove viruses.
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Affiliation(s)
- N Shirasaki
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628 Japan.
| | - T Matsushita
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628 Japan
| | - Y Matsui
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628 Japan
| | - R Yamashita
- Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628 Japan
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