1
|
Zajac O, Zielinska M, Zubrowska-Sudol M. Enhancing wastewater treatment efficiency: A hybrid technology perspective with energy-saving strategies. BIORESOURCE TECHNOLOGY 2024; 399:130593. [PMID: 38493937 DOI: 10.1016/j.biortech.2024.130593] [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: 12/16/2023] [Revised: 03/13/2024] [Accepted: 03/14/2024] [Indexed: 03/19/2024]
Abstract
The study aimed to investigate how hybrid technology, combined with various intermittent aeration (IA) strategies, contributes to reducing the energy costs of wastewater treatment while simultaneously ensuring a high treatment efficiency. Even with IA subphases lasting half as long as those without aeration, and oxygen levels reduced from 3.5 to 1.5 mg O2/L, pollutants removal efficiency remains robust, allowing for a 1.41-fold reduction in energy consumption (EO). Hybrid technology led to a 1.34-fold decrease in EO, along with improved denitrification efficiency from 74.05 ± 4.71 to 81.87 ± 2.43 % and enhanced biological phosphorus removal from 35.03 ± 4.25 to 87.32 ± 3.64 %. The high nitrification efficiency may have been attributed to the abundance of Pseudomonas, Acinetobacter, and Rhodococcus, which outcompeted the genera of autotrophic nitrifying bacteria, suggesting that the hybrid system is favorable for the growth of heterotrophic nitrifiers.
Collapse
Affiliation(s)
- Olga Zajac
- Department of Water Supply and Wastewater Treatment, Faculty of Building Services Hydro and Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland.
| | - Magdalena Zielinska
- Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Słoneczna St. 45G, 10-709 Olsztyn, Poland
| | - Monika Zubrowska-Sudol
- Department of Water Supply and Wastewater Treatment, Faculty of Building Services Hydro and Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland
| |
Collapse
|
2
|
Zajac O, Zubrowska-Sudol M. Nitrification kinetics, N 2O emission, and energy use in intermittently aerated hybrid reactor under different organic loading rates. INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY : IJEST 2022; 20:1-14. [PMID: 36567805 PMCID: PMC9765392 DOI: 10.1007/s13762-022-04715-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 11/17/2022] [Accepted: 12/10/2022] [Indexed: 06/17/2023]
Abstract
This study investigated the impact of intermittent aeration strategies and reduction in the reactor's organic and nitrogen loading rates on the course of particular stages of the nitrification process, as well as energy consumption and N2O emissions in a hybrid reactor with nitrification/denitrification. Each of the analysed series revealed the greatest ammonia oxidation activity in activated sludge flocs. The highest activity of nitrite nitrogen oxidation was demonstrated in the case of biofilm. A reduction in the reactor's organic and nitrogen loading rate value had a greater effect on changes in the activity of ammonia-oxidizing bacteria than nitrite-oxidizing bacteria. In a system where the operation of air pumps was controlled through switching them and off according to the adopted ratio between non-aerated and aerated sub-phase times and the assumed oxygen concentration, a reduction in the duration of aerated sub-phases caused no decrease in energy use for aeration. Lower N2O emission was recorded when the reactor operated with a longer duration of aerated sub-phases. Supplementary Information The online version contains supplementary material available at 10.1007/s13762-022-04715-6.
Collapse
Affiliation(s)
- O. Zajac
- Department of Water Supply and Wastewater Treatment, Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland
| | - M. Zubrowska-Sudol
- Department of Water Supply and Wastewater Treatment, Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland
| |
Collapse
|
3
|
Zheng M, Mu G, Zhang A, Wang J, Chang F, Niu J, Wang X, Gao T, Zhao Z. Predominance of comammox bacteria among ammonia oxidizers under low dissolved oxygen condition. CHEMOSPHERE 2022; 308:136436. [PMID: 36115478 DOI: 10.1016/j.chemosphere.2022.136436] [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: 01/21/2022] [Revised: 08/19/2022] [Accepted: 09/10/2022] [Indexed: 06/15/2023]
Abstract
Although low-oxygen nitrification can significantly cut down the aeration demand in wastewater treatment plants, little is known about the community dynamics of relevant microorganisms under different oxygen concentrations. Here, by conducting a series of bioreactors with oxygen concentrations of 0%, 2%, 5%, 10%, 20%, 40%, and 70%, we provided a comprehensive investigation on the behaviors and performances of comammox bacteria (CMX), ammonia-oxidizing bacteria (AOB) and archaea (AOA) during the nitrification process. Quantitative PCR analysis demonstrated that CMX was the dominant ammonia-oxidizer under low oxygen condition (10%) after the four-month operation with the abundance increased by 8.65 times higher than the initial operation, whereas the growth of AOA and AOB was inhibited. Moreover, Nitrospira nitrosa dominated the CMX species (relative abundance >96%) in low dissolved oxygen concentrations, while Nitrospira nitrificans (3.39%) seemed to prefer high oxygen conditions. Our study indicates the long-term effects of oxygen concentrations on the niche differentiation of ammonia oxidizers, and highlights the significance of CMX in low-oxygen nitrification for reducing global carbon emission and energy consumption.
Collapse
Affiliation(s)
- Maosheng Zheng
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Guangli Mu
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Anqi Zhang
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Jiawen Wang
- College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China.
| | - Fang Chang
- Marine Resources Research Centre, Tianjin Research Institute for Water Transport Engineering, M.O.T., Tianjin, 300456, China
| | - Junfeng Niu
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Xinwei Wang
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Tian Gao
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Zhirong Zhao
- Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| |
Collapse
|
4
|
Tang T, Liu M, Du Y, Chen Y. Deciphering the internal mechanisms of ciprofloxacin affected anaerobic digestion, its degradation and detoxification mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 842:156718. [PMID: 35760173 DOI: 10.1016/j.scitotenv.2022.156718] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Revised: 06/02/2022] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
Abstract
Ciprofloxacin (CIP) is widely used in livestock farms, but the internal mechanism of the effect of residual CIP in actual livestock wastewater on anaerobic digestion (AD) performance remains unknown. This study examined the dose-specific effects of CIP (0.5-2 mg/L) on livestock wastewater AD by analyzing acidogenesis and methanogenesis. 0.5 mg/L CIP promoted methane production by facilitating acidogenesis and acetogenesis. Compared with the control, the cumulative methane production increased from 331.38 to 407.44 mL/g VS at a dose of 0.5 mg/L, an increase of 22.95 %. However, as the dose of CIP increased, the cumulative methane production gradually decreased to 217.64 mL/g VS (2 mg/L). Microbial community analysis revealed that CIP had the greatest impact on methane production by influencing the activity of acidogenic bacteria. Meanwhile, acidogenesis was critical for CIP degradation. In acidogenesis, hydroxylation, amination, defluorination, decarboxylation, and piperazine ring breaking not only degraded CIP but also reduced its toxicity. Therefore, a large number of intermediates could be continuously degraded by microorganisms. However, as the dosage of CIP increased, the ability of microorganisms to degrade intermediates decreased.
Collapse
Affiliation(s)
- Taotao Tang
- College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China
| | - Min Liu
- College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China
| | - Ye Du
- College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China
| | - Ying Chen
- College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China.
| |
Collapse
|
5
|
Effect of the Aeration Strategy on NOB Suppression in Activated Sludge and Biofilm in a Hybrid Reactor with Nitrification/Denitrification. WATER 2022. [DOI: 10.3390/w14010072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The purpose of the study was to analyse the impact of aeration strategies defined by the changes in the duration of aerated sub-phases, the ratio between non-aerated and aerated sub-phase times (R), and dissolved oxygen concentrations (DO) on the suppression of nitrite-oxidizing bacteria (NOB) in activated sludge and biofilm developing in a hybrid reactor with nitrification/denitrification. The primary factor causing NOB suppression both in biofilm and in activated sludge was an increase in the R-value (from 0 to 1/4 and from 1/4 to 1/3). After reducing the DO from 3 to 2 mg O2/L, there were no changes in the frequency of NOB occurrence, and no reduction in the nitrite oxidation rate was recorded. The abundance of Comammox bacteria was considerably affected by the change from continuous to intermittent aeration. Activated sludge showed a substantial increase in the quantity of clade A and B, whereas the quantity considerably decreased in biofilm.
Collapse
|
6
|
Tahon G, Gök D, Lebbe L, Willems A. Description and functional testing of four species of the novel phototrophic genus Chioneia gen. nov., isolated from different East Antarctic environments. Syst Appl Microbiol 2021; 44:126250. [PMID: 34592543 DOI: 10.1016/j.syapm.2021.126250] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 09/02/2021] [Accepted: 09/03/2021] [Indexed: 10/20/2022]
Abstract
Seven Gram-negative, aerobic, non-sporulating, motile strains were isolated from terrestrial (R-67880T, R-67883, R-36501 and R-36677T) and aquatic (R-39604, R-39161T and R-39594T) East Antarctic environments (i.e. soil and aquatic microbial mats), between 2007 and 2014. Analysis of near-complete 16S rRNA gene sequences revealed that the strains potentially form a novel genus in the family Sphingomonadaceae (Alphaproteobacteria). DNA-DNA reassociation and average nucleotide identity values indicated distinction from close neighbors in the family Sphingomonadaceae and showed that the seven isolates form four different species. The main central pathways present in the strains are the glycolysis, tricarboxylic acid cycle and pentose phosphate pathway. The strains can use only a limited number of carbon sources and mainly depend on ammonia and sulfate as a nitrogen and sulfur source, respectively. The novel strains showed the potential of aerobic anoxygenic phototrophy, based on the presence of bacteriochlorophyll a pigments, which was corroborated by the presence of genes for all building blocks for a type 2 photosynthetic reaction center in the annotated genomes. Based on the results of phenotypic, genomic, phylogenetic and chemotaxonomic analyses, the strains could be assigned four new species in the novel genus Chioneia gen. nov. in the family Sphingomonadaceae, for which the names C. frigida sp. nov. (R-67880T, R-67883 and R-36501), C. hiemis sp. nov. (R-36677T), C. brumae sp. nov. (R-39161T and R-39604) and C. algoris sp. nov. (R-39594T) are proposed.
Collapse
Affiliation(s)
- Guillaume Tahon
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium.
| | - Duygu Gök
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium.
| | - Liesbeth Lebbe
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium.
| | - Anne Willems
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Ghent University, Ghent, Belgium.
| |
Collapse
|
7
|
Abstract
Plastic pollution has been a significant and widespread global issue, and the recent COVID-19 pandemic has been attributed to its worsening effect as plastics have been contaminated with the deadly infectious virus. Microplastics (MPs) may have played a role as a vector that carries hazardous microbes such as emerging bacterial threats (i.e. antibiotic resistant bacteria) and deadly viruses (e.g., coronavirus); this causes great concern over microplastics contaminated with emerging contaminants. Mitigation and treatment of MPs are challenging because of a range of factors including but not limited to physicochemical properties and composition of MPs and pH and salinity of the solution. Despite the heterogeneous nature of aquatic systems, research has overlooked interactions between contaminants and MPs under environmental conditions, degradation pathways of MPs with adsorbed contaminants, and, especially, the role of adsorbed contaminants in the efficiency of MP treatment through membrane filtration, in comparison with other treatment methods. This review aims to (1) analyze an assortment of factors that could influence the removal of MPs and mechanisms of contaminant adsorption on MPs, (2) identify mechanisms influencing membrane filtration of MPs, (3) examine the fate and transport of MPs with adsorbed contaminants, (4) evaluate membrane filtration of contaminant-adsorbing MPs in comparison to other treatment methods, and (5) draw conclusions and the future outlook based on a literature analysis.
Collapse
Key Words
- adsorption mechanisms
- contaminants
- microplastics
- membrane filtration
- ddt, dichloro-diphenyl-trichloroethane
- dm, dynamic membrane
- edcs, endocrine-disrupting compounds
- fosa or pfosa, perfluorooctane sulfonamide
- gac, granular activated carbon
- hdpe, high-density polyethylene
- ldpe, low-density pe
- mf, microfiltration
- mps, microplastics
- mbr, membrane bioreactor
- nf, nanofiltration
- nom, natural organic matter
- nps, nanoplastics
- om, organic matter
- pas, polyacrylates
- pa, polyamide (nylon)
- pahs, polycyclic aromatic hydrocarbons
- pbdes, polybrominated diphenyl ethers
- pcbs, polychlorinated biphenyls
- pe, polyethylene
- pet, polyethylene terephthalate
- pfcs, perfluorinated compounds
- pfcas, perfluorinated carboxylates
- pfoa, perfluorooctanoic acid
- pfos, perfluorooctanesulfonic acid
- pfas, per-/poly-fluoroalkyl substances
- pfhxa, perfluorohexanoic acid
- pops, persistent organic pollutants
- ppcps, pharmaceuticals and personal care products
- pp, polypropylene
- ps, polystyrene
- pvc, polyvinyl chloride
- pvdf, polyvinylidene fluoride
- ro, reverse osmosis
- sr, synthetic rubber
- tmp, trans membrane pressure
- uf, ultrafiltration
Collapse
|
8
|
Ashrafi E, Allahyari E, Torresi E, Andersen HR. Effect of slow biodegradable substrate addition on biofilm structure and reactor performance in two MBBRs filled with different support media. ENVIRONMENTAL TECHNOLOGY 2020; 41:2750-2759. [PMID: 30734662 DOI: 10.1080/09593330.2019.1581261] [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: 10/06/2018] [Accepted: 02/04/2019] [Indexed: 06/09/2023]
Abstract
In this study, two moving-bed biofilm reactors (MBBR1 and MBBR2) filled with different size of carrier media (Kaldnes K1 and Kaldnes K1 micro, respectively) were subjected to soluble (sugar and sodium acetate (Ac)) substrate and mixture of soluble and particulate (particulate potato starch (PS)) substrate in a very high organic loading rate (12 kgCOD/m3·d) at different temperatures (26 and 15°C, in MBBR1 and MBBR2, respectively). The effects of carrier type and substrate on biofilm structure and reactor performance have been studied. Starch was removed by adsorption at the biofilm surface and hydrolyzed which caused substrate gradient in MBBR1, however, hydrolyzed uniformly within biofilm in MBBR2. The biofilm of MBBR1 was irregular due to filamentous structure growth due to the substrate gradient, while, it was regular in MBBR2 due to uniform distribution of substrate. The performance of both MBBRs in ammonium, COD and TN removal decreased significantly when the amount of small particles in the reactor increased owing to feeding by starch, which led to biomass density decline. The type of media affected the quantity and distribution of attached biomass, which in turn influenced the activity of specific microbial functional groups in the biofilm. The biofilm in MBBR2 was thicker and consequently nitrogen removal by denitrification was much higher. The lower temperature did not affect negatively the reactor performance in MBBR2.
Collapse
Affiliation(s)
- Elham Ashrafi
- Biochemical and Bioenvironmental Research Center (BBRC), Sharif University of Technology, Tehran, Iran
- Water Lab, Sanitary Section, Department of Civil Engineering and Geoscience, Delft University of Technology, Delft, Netherlands
| | - Edris Allahyari
- Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran
| | - Elena Torresi
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Henrik Rasmus Andersen
- Department of Environmental Engineering, Technical University of Denmark, Kongens Lyngby, Denmark
| |
Collapse
|
9
|
Ma Y, Dai W, Zheng P, Zheng X, He S, Zhao M. Iron scraps enhance simultaneous nitrogen and phosphorus removal in subsurface flow constructed wetlands. JOURNAL OF HAZARDOUS MATERIALS 2020; 395:122612. [PMID: 32361175 DOI: 10.1016/j.jhazmat.2020.122612] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/26/2020] [Accepted: 03/27/2020] [Indexed: 06/11/2023]
Abstract
In rural domestic wastewater treatment using subsurface constructed wetland system (SFCWs), the lack of a carbon source for denitrification and limited phosphorus uptake are responsible for low removal of nitrogen and phosphorus, and a suitable substrate is therefore, necessary. Iron is an important component in nitrogen and phosphorus biogeochemical cycles. Few studies have addressed the application of iron in SFCWs. Therefore, we constructed SFCWs that used iron scraps as a substrate. Enhanced nitrification, denitrification and removal of phosphorus were observed. The large proportion of nitrite-oxidising bacteria present in CWs with iron scraps (CW-T) compared to gravel beds indicated that iron may enhance ammonium (NH4+) oxidation. More nitrate-reducing bacteria related to Fe and autotrophic denitrifying bacteria were discovered in the back zone of CW-T and these enhanced denitrification process. Phosphate (PO43-) reacted with ferrous ion (Fe2+) and ferric ion (Fe3+) to generate the precipitant. Moreover, Fe3+ reacted with water to generate iron oxide (FeOOH) that had a large adsorption capacity for phosphorus. After six months of operation, average NH4+-N, total nitrogen and total phosphorus removal rates were 66.98 ± 13.37 %, 71.26 ± 13.57 % and 93.54 ± 6.64 %, respectively. Iron scraps can potentially be utilised in SFCWs in rural domestic wastewater treatment.
Collapse
Affiliation(s)
- Yuhui Ma
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Wanqing Dai
- School of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, China
| | - Peiru Zheng
- School of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, China
| | - Xiangyong Zheng
- School of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, China.
| | - Shengbing He
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
| | - Min Zhao
- School of Life and Environmental Science, Wenzhou University, Wenzhou, 325000, China
| |
Collapse
|
10
|
Berrelleza-Valdez F, Parades-Aguilar J, Peña-Limón CE, Certucha-Barragán MT, Gámez-Meza N, Serrano-Palacios D, Medina-Juárez LA, Calderón K. A novel process of the isolation of nitrifying bacteria and their development in two different natural lab-scale packed-bed bioreactors for trichloroethylene bioremediation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 241:211-218. [PMID: 31004998 DOI: 10.1016/j.jenvman.2019.04.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/11/2019] [Accepted: 04/12/2019] [Indexed: 06/09/2023]
Abstract
Trichloroethylene (TCE) is a carcinogenic compound that is commonly present in groundwater and has been detected in drinking water sources for Mexican towns in the Mexico-US border area. Nitrifying bacteria, such as Nitrosomonas europaea, have been shown to be capable of degrading halogenated compounds, including TCE, but it is difficult to obtain high cell concentrations of these bacteria. The aim of the present study was to generate biomass of a nitrifying bacterial consortium from the sludge of an urban wastewater treatment plant (WWTP) and evaluate its capacity to biodegrade TCE in two different natural lab-scaled packed bed bioreactors. The consortium was isolated by a novel method using a continuous stirred-tank bioreactor inoculated with activated sludge from the Domos WWTP located in Cd. Obregón, Sonora, Mexico. The bioreactor was fed with specific media to cultivate ammonia-oxidizing bacteria at a dilution rate near the maximum specific growth rate reported for Nitrosomonas europaea. Optical density and suspended solids measurements were performed to determine the culture biomass production, and the presence of inorganic nitrogen species was determined by spectrophotometry. The presence of nitrifying ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) was confirmed by PCR amplification, and biofilm formation was observed by scanning electron microscopy. Batch-scale experiments confirmed the biodegradative activity of the isolated consortium, which was subsequently fixed in an inorganic carrier as zeolite and a synthetic carrier such as polyurethane to both be used as lab-scale packed-bed bioreactors, with up to 58.63% and 62.7% of TCE biodegradation achieved, respectively, demonstrating a possible alternative for TCE bioremediation in environmental and engineering systems.
Collapse
Affiliation(s)
- Fernando Berrelleza-Valdez
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Jonathan Parades-Aguilar
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Carlos E Peña-Limón
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
| | - María Teresa Certucha-Barragán
- Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Nohemí Gámez-Meza
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico
| | - Denisse Serrano-Palacios
- Departamento de Ciencias del Agua y Medio Ambiente, Instituto Tecnológico de Sonora, Antonio Caso S/N. C.P., 85130, Ciudad Obregón, Sonora, Mexico
| | - Luis Angel Medina-Juárez
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
| | - Kadiya Calderón
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Blvd. Luis Donaldo Colosio S/N. CP., 83000, Hermosillo, Sonora, Mexico.
| |
Collapse
|
11
|
Van der Heyden C, De Mulder T, Volcke EIP, Demeyer P, Heyndrickx M, Rasschaert G. Long-term microbial community dynamics at two full-scale biotrickling filters treating pig house exhaust air. Microb Biotechnol 2019; 12:775-786. [PMID: 31106964 PMCID: PMC6559015 DOI: 10.1111/1751-7915.13417] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 03/23/2019] [Accepted: 04/06/2019] [Indexed: 11/30/2022] Open
Abstract
In this study, the microbial community structure of two full‐scale biotrickling filters treating exhaust air from a pig housing facility were evaluated using 16S metabarcoding. The effect of inoculation with activated sludge of a nearby domestic waste water treatment plant was investigated, which is a cheap procedure and easy to apply in practice. The study was performed at a three‐stage and a two‐stage full‐scale biotrickling filter; of which, only the latter was inoculated. Both biotrickling filters evolved towards a rather similar community over time, which differed from the one in the activated sludge used for inoculation. However, the bacterial population at both biotrickling filters showed small differences on the family level. A large population of heterotrophic bacteria, including denitrifying bacteria, was present in both biotrickling filters. In the non‐inoculated biotrickling filter, nitrite‐oxidizing bacteria (NOB) could not be detected, which corresponded with the incomplete nitrification leading to high nitrite accumulation observed in this system. Inoculation with the wide spectrum inoculum activated sludge had in this study a positive effect on the biotrickling filter performance (higher ammonia removal and lower nitrous oxide production). It could thus be beneficial to inoculate biotrickling filters in order to enrich NOB at the start‐up, making it easier to keep the free nitrous acid concentration low enough to not be inhibited by it.
Collapse
Affiliation(s)
- Caroline Van der Heyden
- Department of Biosystems Engineering, Ghent University, Coupure links 653, 9000, Gent, Belgium.,Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Burgemeester Van Gansberghelaan 115, bus 1, 9820, Merelbeke, Belgium.,Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Thijs De Mulder
- Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Brusselsesteenweg 370, 9090, Melle, Belgium
| | - Eveline I P Volcke
- Department of Biosystems Engineering, Ghent University, Coupure links 653, 9000, Gent, Belgium
| | - Peter Demeyer
- Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Burgemeester Van Gansberghelaan 115, bus 1, 9820, Merelbeke, Belgium
| | - Marc Heyndrickx
- Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Brusselsesteenweg 370, 9090, Melle, Belgium.,Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium
| | - Geertui Rasschaert
- Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Brusselsesteenweg 370, 9090, Melle, Belgium
| |
Collapse
|
12
|
da Costa RE, Lobo-Recio MA, Battistelli AA, Bassin JP, Belli TJ, Lapolli FR. Comparative study on treatment performance, membrane fouling, and microbial community profile between conventional and hybrid sequencing batch membrane bioreactors for municipal wastewater treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:32767-32782. [PMID: 30251038 DOI: 10.1007/s11356-018-3248-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 09/14/2018] [Indexed: 06/08/2023]
Abstract
A sequencing batch conventional membrane bioreactor (SB-CMBR) and sequencing batch hybrid membrane bioreactor (SB-HMBR) were operated in parallel under two different hydraulic retention times (HRTs) (namely 12 h and 6 h), and their chemical oxygen demand (COD) and nutrient removal performance, membrane fouling behavior, and microbial community characteristics were compared. Both systems exhibited high organic matter (> 95%) and ammonium (> 98%) removal performance regardless of the HRT applied. As the HRT was reduced from 12 to 6 h, total nitrogen removal slightly increased in both reactors, being higher in the carrier-based MBR, where anoxic zones may have been established within the biofilm. Conversely, total phosphorus removal improved only in the SB-CMBR at the shorter HRT. Moreover, activity batch assays have shown a faster P uptake rate in the SB-CMBR than in the SB-HMBR, a result likely associated with the lower relative abundance of phosphate-accumulating organisms in both adhered and suspended biomass fractions in the hybrid MBR. The results also revealed that more pronounced increases in the transmembrane pressure and, consequently, in the membrane fouling rate at higher COD loading rates were observed in the SB-CMBR, where the soluble microbial products (proteins, polysaccharides, and especially, transparent exopolymer particles), supernatant turbidity, and filamentous bacteria were more significant. Overall, as compared to the conventional MBR, the plastic media-based SB-HMBR showed a lower fouling propensity at all hydraulic conditions tested.
Collapse
Affiliation(s)
- Rayra Emanuelly da Costa
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, P.O. Box 476, Florianópolis, SC, 88040-900, Brazil
| | - Maria Angeles Lobo-Recio
- Department of Energy Engineering, Federal University of Santa Catarina, Araranguá, SC, 88906-072, Brazil
| | - André Aguiar Battistelli
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, P.O. Box 476, Florianópolis, SC, 88040-900, Brazil
| | - João Paulo Bassin
- Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21941-972, Brazil.
| | - Tiago José Belli
- Department of Sanitary Engineering, State University of Santa Catarina, Ibirama, SC, 89140-000, Brazil.
| | - Flávio Rubens Lapolli
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, P.O. Box 476, Florianópolis, SC, 88040-900, Brazil
| |
Collapse
|
13
|
Ki BM, Ryu HW, Cho KS. Extended local similarity analysis (eLSA) reveals unique associations between bacterial community structure and odor emission during pig carcasses decomposition. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2018; 53:718-727. [PMID: 29469603 DOI: 10.1080/10934529.2018.1439856] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Soil burial and composting methods have been widely used for the disposal of pig carcasses. The relationship between bacterial community structure and odor emission was examined using extended local similarity analysis (eLSA) during the degradation of pig carcasses in soil and compost. In soil, Hyphomicrobium, Niastella, Rhodanobacter, Polaromonas, Dokdonella and Mesorhizobium were associated with the emission of sulfur-containing odors such as hydrogen sulfide, methyl mercaptan and dimethyl disulfide. Sphingomonas, Rhodanobacter, Mesorhizobium, Dokdonella, Leucobacter and Truepera were associated with the emission of nitrogen-containing odors including ammonia and trimetylamine. In compost, however, Carnobacteriaceae, Lachnospiaceae and Clostridiales were highly correlated with the emission of sulfur-containing odors, while Rumincoccaceae was associated with the emission of nitrogen-containing odors. The emission of organic acids was closely related to Massilia, Sphaerobacter and Bradyrhizobiaceae in soil, but to Actinobacteria, Sporacetigenium, Micromonosporaceae and Solirubrobacteriales in compost. This study suggests that network analysis using eLSA is a useful strategy for exploring the mechanisms of odor emission during biodegradation of pig carcasses.
Collapse
Affiliation(s)
- Bo-Min Ki
- a Department of Environmental Science and Engineering , Ewha Womans University , Seoul , Republic of Korea
| | - Hee Wook Ryu
- b Department of Chemical Engineering , Soongsil University , Seoul , Republic of Korea
| | - Kyung-Suk Cho
- a Department of Environmental Science and Engineering , Ewha Womans University , Seoul , Republic of Korea
| |
Collapse
|
14
|
Torresi E, Gülay A, Polesel F, Jensen MM, Christensson M, Smets BF, Plósz BG. Reactor staging influences microbial community composition and diversity of denitrifying MBBRs- Implications on pharmaceutical removal. WATER RESEARCH 2018; 138:333-345. [PMID: 29635164 DOI: 10.1016/j.watres.2018.03.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 02/16/2018] [Accepted: 03/06/2018] [Indexed: 06/08/2023]
Abstract
The subdivision of biofilm reactor in two or more stages (i.e., reactor staging) represents an option for process optimisation of biological treatment. In our previous work, we showed that the gradient of influent organic substrate availability (induced by the staging) can influence the microbial activity (i.e., denitrification and pharmaceutical biotransformation kinetics) of a denitrifying three-stage Moving Bed Biofilm Reactor (MBBR) system. However, it is unclear whether staging and thus the long-term exposure to varying organic carbon type and loading influences the microbial community structure and diversity. In this study, we investigated biofilm structure and diversity in the three-stage MBBR system (S) compared to a single-stage configuration (U) and their relationship with microbial functions. Results from 16S rRNA amplicon libraries revealed a significantly higher microbial richness in the staged MBBR (at 99% sequence similarity) compared to single-stage MBBR. A more even and diverse microbial community was selected in the last stage of S (S3), likely due to exposure to carbon limitation during continuous-flow operation. A core of OTUs was shared in both systems, consisting of Burkholderiales, Xanthomonadales, Flavobacteriales and Sphingobacteriales, while MBBR staging selected for specific taxa (i.e., Candidate division WS6 and Deinococcales). Results from quantitative PCR (qPCR) showed that S3 exhibited the lowest abundance of 16S rRNA but the highest abundance of atypical nosZ, suggesting a selection of microbes with more diverse N-metabolism (i.e., incomplete denitrifiers) in the stage exposed to the lowest carbon availability. A positive correlation (p < 0.05) was observed between removal rate constants of several pharmaceuticals with abundance of relevant denitrifying genes, but not with biodiversity. Despite the previously suggested positive relationship between microbial diversity and functionality in macrobial and microbial ecosystems, this was not observed in the current study, indicating a need to further investigate structure-function relationships for denitrifying systems.
Collapse
Affiliation(s)
- Elena Torresi
- DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kongens Lyngby, Denmark; Veolia Water Technologies AB, AnoxKaldnes, Klosterängsvägen 11A, SE-226 47 Lund, Sweden.
| | - Arda Gülay
- DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kongens Lyngby, Denmark
| | - Fabio Polesel
- DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kongens Lyngby, Denmark
| | - Marlene M Jensen
- DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kongens Lyngby, Denmark
| | - Magnus Christensson
- Veolia Water Technologies AB, AnoxKaldnes, Klosterängsvägen 11A, SE-226 47 Lund, Sweden
| | - Barth F Smets
- DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kongens Lyngby, Denmark.
| | - Benedek Gy Plósz
- DTU Environment, Technical University of Denmark, Bygningstorvet B115, 2800 Kongens Lyngby, Denmark; Department of Chemical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK
| |
Collapse
|
15
|
Mannina G, Capodici M, Cosenza A, Di Trapani D. Nitrous oxide from integrated fixed-film activated sludge membrane bioreactor: Assessing the influence of operational variables. BIORESOURCE TECHNOLOGY 2018; 247:1221-1227. [PMID: 28951133 DOI: 10.1016/j.biortech.2017.09.083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 06/07/2023]
Abstract
The influence of the main operational variables on N2O emissions from an Integrated Fixed Film Activated Sludge University of Cape Town membrane Bioreactor pilot plant was studied. Nine operational cycles (total duration: 340days) were investigated by varying the value of the mixed liquor sludge retention time (SRT) (Cycles 1-3), the feeding ratio between carbon and nitrogen (C/N) (Cycles 4-6) and simultaneously the hydraulic retention time (HRT) and the SRT (Cycles 7-9). Results show a huge variability of the N2O concentration in liquid and off-gas samples (ranged from 10-1μgN2O-NL-1 to 103μgN2O-NL-1). The maximum N2O concentration (1228μgN2O-NL-1) in the off-gas samples occurred in the anoxic reactor at the lowest C/N value confirming that unbalanced C/N promotes the N2O emission during denitrification. The aerated reactors (aerobic and MBR) have been the major N2O emitters during all the three Phases.
Collapse
Affiliation(s)
- Giorgio Mannina
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, Ed. 8, 90100 Palermo, Italy
| | - Marco Capodici
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, Ed. 8, 90100 Palermo, Italy
| | - Alida Cosenza
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, Ed. 8, 90100 Palermo, Italy
| | - Daniele Di Trapani
- Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, Università di Palermo, Viale delle Scienze, Ed. 8, 90100 Palermo, Italy.
| |
Collapse
|
16
|
Dong Q, Liu Y, Shi H, Huang X. Effects of graphite nanoparticles on nitrification in an activated sludge system. CHEMOSPHERE 2017; 182:231-237. [PMID: 28499184 DOI: 10.1016/j.chemosphere.2017.04.144] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 04/26/2017] [Accepted: 04/27/2017] [Indexed: 06/07/2023]
Abstract
Graphite nanoparticles (GNPs) might result in unexpected effects during their transportation and transformation in wastewater treatment systems, including strong thermo-catalytic and catalytic effects and microbial cytotoxicity. In particular, the effects of GNPs on the nitrification process in activated sludge systems should be addressed. This study aimed to estimate the influence of GNPs on the nitrification process in a short-term nitrification reactor with exposure to different light sources. The results indicated that GNPs could only improve the efficiency of photothermal transformation slightly in the activated sludge system because of its photothermal effects under the standard illuminant (imitating 1 × sun). However, even with better photothermal effects, the nitrification efficiency still decreased significantly with GNP dosing under the standard illuminant, which might result from stronger cytotoxic effects of GNPs on the nitrifying bacteria. The disappearance of extracellular polymeric substances (EPS) around bacterial cells was observed, and the total quantity of viable bacteria decreased significantly after GNP exposuring. Variation in bacterial groups primarily occurred in nitrifying microbial communities, including Nitrosomonas sp., Nitrosospira sp., Comamonas sp. and Bradyrhizobiace sp. Nitrifiers significantly decreased, while the phyla Gammaproteobacteria, Deinocccus, and Bacteroidetes exhibited greater stability during GNP treatment.
Collapse
Affiliation(s)
- Qian Dong
- School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Yanchen Liu
- School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China.
| | - Hanchang Shi
- School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| | - Xia Huang
- School of Environment, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, Beijing, 100084, China
| |
Collapse
|
17
|
How the performance of a biological pre-oxidation step can affect a downstream photo-Fenton process on the remediation of mature landfill leachates: Assessment of kinetic parameters and characterization of the bacterial communities. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2016.11.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
18
|
McCormick AR, Hoellein TJ, London MG, Hittie J, Scott JW, Kelly JJ. Microplastic in surface waters of urban rivers: concentration, sources, and associated bacterial assemblages. Ecosphere 2016. [DOI: 10.1002/ecs2.1556] [Citation(s) in RCA: 276] [Impact Index Per Article: 34.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Affiliation(s)
| | | | | | - Joshua Hittie
- Department of BiologyLoyola University Chicago Illinois 60660 USA
| | - John W. Scott
- Prairie Research InstituteIllinois Sustainable Technology Center Champaign Illinois 61820 USA
| | - John J. Kelly
- Department of BiologyLoyola University Chicago Illinois 60660 USA
| |
Collapse
|
19
|
Salmanikhas N, Tizghadam M, Rashidi Mehrabadi A. Treatment of saline municipal wastewater using hybrid growth system. J Biol Eng 2016; 10:9. [PMID: 27582873 PMCID: PMC5006585 DOI: 10.1186/s13036-016-0030-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2016] [Accepted: 08/19/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In this study, a hybrid treatment system (Fluidized Bed positioned in a biological reactor of an Activated Sludge process) was used to treat saline domestic wastewater. The performance of the mentioned hybrid system was compared with the conventional activated sludge. A pilot study was conducted, and Chemical Oxygen Demand (COD), Electrical Conductivity (EC), Total Dissolved Solids (TDS) and pH were measured to investigate treatment efficiency. Three saline wastewater samples with salt concentrations of 0.5, 1, and 1.5 % and detention times of 2, 4 and 6 h were loaded into both rectors of hybrid system and activated sludge. RESULTS The results showed that Chemical Oxygen Demand (COD) removals at salt concentrations of 0.5, 1, 1.5 % were equal to 80, 71, 48.5 for the hybrid system and 62, 47.7, 26.5 for the activated sludge system respectively. Likewise, similar results obtained for other contamination indices indicating the superiority of the hybrid system in comparison to activated sludge system. Moreover, another advantage of the hybrid system was that the activated sludge needed sludge returning while sludge returning was not required in the hybrid system. In addition, by loading fixed rate of air into both systems, dissolved oxygen concentration in the hybrid reactor is higher than the conventional reactor. CONCLUSIONS Therefore, the hybrid system had a significantly higher efficiency than conventional reactor to treat saline domestic wastewater.
Collapse
Affiliation(s)
- N Salmanikhas
- Department of Water and Environmental Engineering, Abbaspour School of Engineering, ShahidBeheshti University, Tehran, Iran
| | - M Tizghadam
- Department of Water and Environmental Engineering, Abbaspour School of Engineering, ShahidBeheshti University, Tehran, Iran
| | - A Rashidi Mehrabadi
- Department of Water and Environmental Engineering, Abbaspour School of Engineering, ShahidBeheshti University, Tehran, Iran
| |
Collapse
|
20
|
Leyva-Díaz JC, González-Martínez A, Calderón K, González-López J, Muñío MDM, Poyatos JM. Microbial Kinetics and Enzymatic Activities in Hybrid Moving-Bed Biofilm Reactor-Membrane Bioreactor Systems. Chem Eng Technol 2016. [DOI: 10.1002/ceat.201400750] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Sytek-Szmeichel K, Podedworna J, Zubrowska-Sudol M. Efficiency of wastewater treatment in SBR and IFAS-MBSBBR systems in specified technological conditions. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2016; 73:1349-1356. [PMID: 27003075 DOI: 10.2166/wst.2015.611] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The objective of this study is to compare wastewater treatment effectiveness in sequencing batch reactor (SBR) and integrated fixed-film activated sludge-moving-bed sequencing batch biofilm reactor (IFAS-MBSBBR) systems in specific technological conditions. The comparison of these two technologies was based on the following assumptions, shared by both series, I and II: the reactor's active volume was 28 L; 8-hour cycle of reactor's work, with the same sequence and duration of its consecutive phases; and the dissolved oxygen concentration in the aerobic phases was maintained at a level of 3.0 mg O2/L. For both experimental series (I and II), comparable effectiveness of organic compound (chemical oxygen demand (COD)) removal, nitrification and biological phosphorus removal has been obtained at levels of 95.1%, 97% and 99%, respectively. The presence of the carrier improved the efficiency of total nitrogen removal from 86.3% to 91.7%. On the basis of monitoring tests, it has been found that the ratio of simultaneous denitrification in phases with aeration to the total efficiency of denitrification in the cycle was 1.5 times higher for IFAS-MBSBBR.
Collapse
Affiliation(s)
- K Sytek-Szmeichel
- Faculty of Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland E-mail:
| | - J Podedworna
- Faculty of Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland E-mail:
| | - M Zubrowska-Sudol
- Faculty of Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland E-mail:
| |
Collapse
|
22
|
Reboleiro-Rivas P, Martín-Pascual J, Morillo JA, Juárez-Jiménez B, Poyatos JM, Rodelas B, González-López J. Interlinkages between bacterial populations dynamics and the operational parameters in a moving bed membrane bioreactor treating urban sewage. WATER RESEARCH 2016; 88:796-807. [PMID: 26599433 DOI: 10.1016/j.watres.2015.10.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 10/28/2015] [Accepted: 10/29/2015] [Indexed: 06/05/2023]
Abstract
Bacteria are key players in biological wastewater treatments (WWTs), thus a firm knowledge of the bacterial population dynamics is crucial to understand environmental/operational factors affecting the efficiency and stability of the biological depuration process. Unfortunately, little is known about the microbial ecology of the advanced biological WWTs combining suspended biomass (SB) and attached biofilms (AB). This study explored in depth the bacterial community structure and population dynamics in each biomass fraction from a pilot-scale moving bed membrane bioreactor (MBMBR) treating municipal sewage, by means of temperature-gradient gel electrophoresis (TGGE) and 454-pyrosequencing. Eight experimental phases were conducted, combining different carrier filling ratios, hydraulic retention times and concentrations of mixed liquor total suspended solids. The bacterial community, dominated by Proteobacteria (20.9-53.8%) and Actinobacteria (20.6-57.6%), was very similar in both biomass fractions and able to maintain its functional stability under all the operating conditions, ensuring a successful and steady depuration process. Multivariate statistical analysis demonstrated that solids concentration, carrier filling ratio, temperature and organic matter concentration in the influent were the significant factors explaining population dynamics. Bacterial diversity increased as carrier filling ratio increased (from 20% to 35%, v/v), and solids concentration was the main factor triggering the shifts of the community structure. These findings provide new insights on the influence of operational parameters on the biology of the innovative MBMBRs.
Collapse
Affiliation(s)
- P Reboleiro-Rivas
- Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, 18071 Granada, Spain; Instituto del Agua, Universidad de Granada, 18071 Granada, Spain.
| | - J Martín-Pascual
- Departamento de Ingeniería Civil, Universidad de Granada, 18071 Granada, Spain; Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
| | - J A Morillo
- Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
| | - B Juárez-Jiménez
- Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, 18071 Granada, Spain; Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
| | - J M Poyatos
- Departamento de Ingeniería Civil, Universidad de Granada, 18071 Granada, Spain; Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
| | - B Rodelas
- Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, 18071 Granada, Spain; Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
| | - J González-López
- Departamento de Microbiología, Facultad de Farmacia, Universidad de Granada, 18071 Granada, Spain; Instituto del Agua, Universidad de Granada, 18071 Granada, Spain
| |
Collapse
|
23
|
Bae H, Chung YC, Yang H, Lee C, Aryapratama R, Yoo YJ, Lee S. Assessment of bacterial community structure in nitrifying biofilm under inorganic carbon-sufficient and -limited conditions. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2015; 50:201-212. [PMID: 25560266 DOI: 10.1080/10934529.2014.975550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this work, nitrification and changes in the composition of the total bacterial community under inorganic carbon (IC)-limited conditions, in a nitrifying moving bed biofilm reactor, was investigated. A culture-independent analysis of cloning and sequencing based on the 16S rRNA gene was applied to quantify the bacterial diversity and to determine bacterial taxonomic assignment. IC concentrations had significant effects on the stability of ammonia-oxidation as indicated by the reduction of the nitrogen conversion rate with high NH4(+)-N loadings. The predominance of Nitrosomonas europaea was maintained in spite of changes in the IC concentration. In contrast, heterotrophic bacterial species contributed to a high bacterial diversity, and to a dynamic shift in the bacterial community structure, under IC-limited conditions. In this study, individual functions of heterotrophic bacteria were estimated based on taxonomic information. Possible key roles of coexisting heterotrophic bacteria are the assimilation of organic compounds of extracellular polymeric substances produced by nitrifiers, and biofilm formation by providing a filamentous structure and aggregation properties.
Collapse
Affiliation(s)
- Hyokwan Bae
- a Center for Water Resource Cycle Research, Korea Institute of Science and Technology (KIST) , Seoul , Republic of Korea
| | | | | | | | | | | | | |
Collapse
|
24
|
Ning X, Qiao W, Zhang L, Gao X. Microbial community in anoxic–oxic–settling–anaerobic sludge reduction process revealed by 454 pyrosequencing analysis. Can J Microbiol 2014; 60:799-809. [DOI: 10.1139/cjm-2014-0263] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Modification of the anoxic–oxic (AO) process by inserting a sludge holding tank (SHT) into the sludge return line forms an anoxic–oxic–settling–anaerobic (A+OSA) process that can achieve a 48.98% sludge reduction rate. The 454 pyrosequencing method was used to obtain the microbial communities of the AO and A+OSA processes. Results showed that the microbial community structures of the 2 processes were different as a result of the SHT insertion. Bacteria assigned to the phyla Proteobacteria and Bacteroidetes commonly existed and dominated the microbial populations of the 2 processes. However, the relative abundance of these populations shifted in the presence of SHT. The relative abundance of Proteobacteria decreased during the A+OSA process. A specific comparison at the class level showed that Sphingobacteria was enriched in the A+OSA process. The result suggested that the fermentative bacteria Sphingobacteria may have key functions in reducing the sludge from the A+OSA process. Uncultured Nitrosomonadaceae gradually became the dominant ammonia-oxidizing bacteria, and the nitrite-oxidizing bacterium Nitrospira was enriched in the A+OSA process. Both occurrences were favorable for stabilized nitrogen removal. The known denitrifying species in the A+OSA process were similar to those in the AO process; however, their relative abundance also decreased.
Collapse
Affiliation(s)
- Xinqiang Ning
- Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, People’s Republic of China
| | - Wenwen Qiao
- Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, People’s Republic of China
| | - Lei Zhang
- Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing, People’s Republic of China
| | - Xu Gao
- Chongqing Water Group Company Limited, Chongqing 400015, People’s Republic of China
| |
Collapse
|
25
|
Sun Y, Shen YX, Liang P, Zhou J, Yang Y, Huang X. Linkages between microbial functional potential and wastewater constituents in large-scale membrane bioreactors for municipal wastewater treatment. WATER RESEARCH 2014; 56:162-71. [PMID: 24675272 DOI: 10.1016/j.watres.2014.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 02/11/2014] [Accepted: 03/02/2014] [Indexed: 05/17/2023]
Abstract
Large-scale membrane bioreactors (MBRs) have been widely used for the municipal wastewater treatment, whose performance relies on microbial communities of activated sludge. Nevertheless, microbial functional structures in MBRs remain little understood. To gain insight into functional genes and their steering environmental factors, we adopted GeoChip, a high-throughput microarray-based tool, to examine microbial genes in four large-scale, in-operation MBRs located in Beijing, China. The results revealed substantial microbial gene heterogeneity (43.7-85.1% overlaps) among different MBRs. Mantel tests indicated that microbial nutrient cycling genes were significantly (P < 0.05) correlated to influent COD, [Formula: see text] -N, TP or sulfate, which signified the importance of microbial mediation of wastewater constituent removal. In addition, functional genes shared by all four MBRs contained a large number of genes involved in antibiotics resistance, metal resistance and organic remediation, suggesting that they were required for degradation or resistance to toxic compounds in wastewater. The linkages between microbial functional structures and environmental variables were also unveiled by the finding of hydraulic retention time, influent COD, [Formula: see text] -N, mixed liquid temperature and humic substances as major factors shaping microbial communities. Together, the results presented demonstrate the utility of GeoChip-based microarray approach in examining microbial communities of wastewater treatment plants and provide insights into the forces driving important processes of element cycling.
Collapse
Affiliation(s)
- Yanmei Sun
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Yue-xiao Shen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Peng Liang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Jizhong Zhou
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China; Institute for Environmental Genomics, Department of Botany and Microbiology, University of Oklahoma, Norman, OK 73019, USA; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Yunfeng Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
| | - Xia Huang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
| |
Collapse
|
26
|
Gao JF, Luo X, Wu GX, Li T, Peng YZ. Quantitative analyses of the composition and abundance of ammonia-oxidizing archaea and ammonia-oxidizing bacteria in eight full-scale biological wastewater treatment plants. BIORESOURCE TECHNOLOGY 2013; 138:285-96. [PMID: 23624046 DOI: 10.1016/j.biortech.2013.03.176] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Revised: 03/23/2013] [Accepted: 03/27/2013] [Indexed: 05/04/2023]
Abstract
This study investigated the diversity and abundance of AOA and AOB amoA genes in eight full-scale wastewater treatment plants (WWTPs). Although the process principles and system operations of the eight WWTPs were different, quantitative real-time PCR measurements showed that AOB amoA genes outnumbered AOA amoA genes with the ratio varying from 2.56 to 2.41×10(3), and ammonia may be partially oxidized by AOA. Phylogenetic analyses based on cloning and sequencing showed that Nitrososphaera cluster was the most dominant AOA species and might be distributed worldwide, and Nitrosopumilis cluster was few. Statistical analysis indicated that there might be versatile AOA ecotypes and some AOA might be not obligate autotrophic. The Nitrosomonas europaea cluster and Nitrosomonas oligotropha cluster were the two most dominant AOB species, and AOB species showed higher diversity than AOA species.
Collapse
Affiliation(s)
- Jing-Feng Gao
- College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China.
| | | | | | | | | |
Collapse
|