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Li H, Zhao Z, Shi M, Luo B, Wang G, Wang X, Gu J, Song Z, Sun Y, Zhang L, Wang J. Metagenomic binning analyses of swine manure composting reveal mechanism of nitrogen cycle amendment using kaolin. Bioresour Technol 2024; 393:130156. [PMID: 38056679 DOI: 10.1016/j.biortech.2023.130156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/02/2023] [Accepted: 12/02/2023] [Indexed: 12/08/2023]
Abstract
The efficient control of nitrogen loss in composting and the enhancement of product quality have become prominent concerns in current research. The positive role of varying concentrations kaolin in reducing nitrogen loss during composting was revealed using metagenomic binning combined with reverse transcription quantitative polymerase chain reaction. The results indicated that the addition of 0.5 % kaolin significantly (P < 0.05) up-regulated the expression of nosZ and nifH on day 35, while concurrently reducing norB abundance, resulting in a reduction of NH3 and N2O emissions by 61.4 % and 17.5 %, respectively. Notably, this study represents the first investigation into the co-occurrence of nitrogen functional genes and heavy metal resistance genes within metagenomic assembly genomes during composting. Emerging evidence indicates that kaolin effectively impedes the binding of Cu/Zn to nirK and nosZ gene reductases through passivation. This study offers a novel approach to enhance compost quality and waste material utilization.
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Affiliation(s)
- Huakang Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; China Construction Sixth Division Construction & Development Co., Ltd., Tianjin 300450, China
| | - Zixuan Zhao
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Meiling Shi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Water Conservancy and Architectural Engineering, Tarim University, Alar 843300, China
| | - Bin Luo
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Guangdong Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaojuan Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Shaanxi Engineering Research Center of Utilization of Agricultural Waste Resources, Northwest A&F University, Yangling, Shaanxi 712100, China.
| | - Jie Gu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Shaanxi Engineering Research Center of Utilization of Agricultural Waste Resources, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zilin Song
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Shaanxi Engineering Research Center of Utilization of Agricultural Waste Resources, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yifan Sun
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Li Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jia Wang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
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2
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Zhao JR, Fan XY, Li X, Gao YX, Zhang ZX. Impact of ciprofloxacin and copper combined pollution on activated sludge: Abundant-rare taxa and antibiotic resistance genes. Bioresour Technol 2022; 349:126882. [PMID: 35217161 DOI: 10.1016/j.biortech.2022.126882] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2022] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 06/14/2023]
Abstract
This study aimed to explore the impacts of ciprofloxacin (CIP, 0.05-40 mg/L) and copper (3 mg/L) combined pollution on nitrification, microbial community and antibiotic resistance genes (ARGs) in activated sludge system during stress- and post-effect periods. Higher CIP concentration inhibited nitrification and an average of 50% total nitrogen removal occurred under 40 mg/L of CIP pressure. The stress- and post-effects on bacterial diversity and structure were obviously distinct. Abundant genera were more sensitive to combined pollution than rare genera based on full-scale classification and conditionally rare or abundant taxa were keystone taxa in their interactions. Ammonia oxidation genes were inhibited under high CIP level, but some aerobic denitrifying bacteria (Thauera, Comamonas and Azoarcus) and key genes increased. 96 ARG subtypes were detected with complex positive relationships and their potential hosts (abundant-rare-functional genera) changed in two periods. This study highlights the different stress- and post-effects of combined pollution on activated sludge.
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Affiliation(s)
- Jun-Ru Zhao
- Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Xiao-Yan Fan
- Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, PR China.
| | - Xing Li
- Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Yu-Xi Gao
- Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Zhong-Xing Zhang
- Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, PR China
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3
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Lopez C, Nnorom MA, Tsang YF, Knapp CW. Pharmaceuticals and personal care products' (PPCPs) impact on enriched nitrifying cultures. Environ Sci Pollut Res Int 2021; 28:60968-60980. [PMID: 34165737 PMCID: PMC8580922 DOI: 10.1007/s11356-021-14696-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 05/31/2021] [Indexed: 06/13/2023]
Abstract
The impact of pharmaceutical and personal care products (PPCPs) on the performance of biological wastewater treatment plants (WWTPs) has been widely studied using whole-community approaches. These contaminants affect the capacity of microbial communities to transform nutrients; however, most have neither honed their examination on the nitrifying communities directly nor considered the impact on individual populations. In this study, six PPCPs commonly found in WWTPs, including a stimulant (caffeine), an antimicrobial agent (triclosan), an insect repellent ingredient (N,N-diethyl-m-toluamide (DEET)) and antibiotics (ampicillin, colistin and ofloxacin), were selected to assess their short-term toxic effect on enriched nitrifying cultures: Nitrosomonas sp. and Nitrobacter sp. The results showed that triclosan exhibited the greatest inhibition on nitrification with EC50 of 89.1 μg L-1. From the selected antibiotics, colistin significantly affected the overall nitrification with the lowest EC50 of 1 mg L-1, and a more pronounced inhibitory effect on ammonia-oxidizing bacteria (AOB) compared to nitrite-oxidizing bacteria (NOB). The EC50 of ampicillin and ofloxacin was 23.7 and 12.7 mg L-1, respectively. Additionally, experimental data suggested that nitrifying bacteria were insensitive to the presence of caffeine. In the case of DEET, moderate inhibition of nitrification (<40%) was observed at 10 mg L-1. These findings contribute to the understanding of the response of nitrifying communities in presence of PPCPs, which play an essential role in biological nitrification in WWTPs. Knowing specific community responses helps develop mitigation measures to improve system resilience.
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Affiliation(s)
- Carla Lopez
- Centre for Water, Environment, Sustainability & Public Health, Department of Civil & Environmental Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK
| | - Mac-Anthony Nnorom
- Centre for Water, Environment, Sustainability & Public Health, Department of Civil & Environmental Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK
| | - Yiu Fai Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, New Territories, 999077, Hong Kong.
| | - Charles W Knapp
- Centre for Water, Environment, Sustainability & Public Health, Department of Civil & Environmental Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK.
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4
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Phan DC, Vazquez-Munoz R, Matta A, Kapoor V. Short-term effects of Mn 2O 3 nanoparticles on physiological activities and gene expression of nitrifying bacteria under low and high dissolved oxygen conditions. Chemosphere 2020; 261:127775. [PMID: 32738717 DOI: 10.1016/j.chemosphere.2020.127775] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/14/2020] [Accepted: 07/19/2020] [Indexed: 06/11/2023]
Abstract
The short-term effects of Mn2O3 nanoparticles (NPs) were examined for nitrifying bacterial enrichments exposed under low and high dissolved oxygen (DO) conditions using substrate (ammonia) specific oxygen uptake rates (sOUR), reverse transcriptase - quantitative polymerase chain reaction (RT-qPCR) assays, and by analysis of 16S rRNA sequences. Samples from nitrifying bioreactor were exposed in batch vessels to Mn2O3 NPs (1, 5 and 10 mg/L) for either 1 or 3 h under no additional aeration or 0.25 L/min aeration. There was increase in nitrification inhibition as determined by sOUR with increasing dosages of Mn2O3 NPs for both low and high DO. At 10 mg/L Mn2O3 NPs, the inhibition was about 7-10% for 1 and 3 h exposure in both cases. There was notable reduction in the transcript levels of amoA, hao and nirK for 10 mg/L of Mn2O3 NPs under 3 h, high DO exposure, which corresponded well with sOUR. The 16S rRNA sequencing showed that there was an inhibitory effect on ammonia oxidizers activity upon exposure to 10 mg/L of Mn2O3 NPs. Collectively, the findings in this study advanced understanding of the different effects of Mn2O3 NPs on nitrifying bacteria.
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Affiliation(s)
- Duc C Phan
- Department of Civil & Environmental Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA
| | - Roberto Vazquez-Munoz
- The South Texas Center for Emerging Infectious Diseases, Department of Biology, The University of Texas at San Antonio, San Antonio, TX, 78249, USA
| | - Akanksha Matta
- Department of Civil & Environmental Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA
| | - Vikram Kapoor
- Department of Civil & Environmental Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA.
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Chen Q, Fan J, Ming H, Su J, Wang Y, Wang B. Effects of environmental factors on denitrifying bacteria and functional genes in sediments of Bohai Sea, China. Mar Pollut Bull 2020; 160:111621. [PMID: 32919123 DOI: 10.1016/j.marpolbul.2020.111621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 08/24/2020] [Accepted: 08/25/2020] [Indexed: 06/11/2023]
Abstract
The ability of denitrifying microorganisms to respond to different ecological pressures remains unknown, especially in marine sediments rich in various heavy metals. Here, gene abundance and transcriptional abundance of five functional denitrification genes (narG, nirK, nirS, norB, and nosZ) in Bohai Sea sediments were examined, and high-throughput Illumina sequencing was used to analyze the community structure of nirK and nirS denitrifying bacteria. The nirS- and nirK-type denitrifying bacteria were classified into different genera. The heavy metal content in sediments was negatively correlated with transcriptional abundance of denitrifying genes, and RNA: DNA ratio for each gene was highest in central Bohai Sea. These results indicated the distribution of nitrite reductase denitrifying bacterial communities was affected by depth, total nitrogen, total phosphorus and sediment grain size. Heavy metal contamination in sediment environment may negatively regulate the transcriptional abundance of denitrifying genes and cause geographical differences in the denitrifying bacterial community structure.
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Affiliation(s)
- Quanrui Chen
- National Marine Environmental Monitoring Center, Dalian 116023, China; Xiamen University, Xiamen 361000, China
| | - Jingfeng Fan
- National Marine Environmental Monitoring Center, Dalian 116023, China.
| | - Hongxia Ming
- National Marine Environmental Monitoring Center, Dalian 116023, China
| | - Jie Su
- National Marine Environmental Monitoring Center, Dalian 116023, China
| | - Yantao Wang
- National Marine Environmental Monitoring Center, Dalian 116023, China; Dalian Ocean University, Dalian 116000, China
| | - Bin Wang
- Dalian Ocean University, Dalian 116000, China
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6
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Li H, Hollstein M, Podder A, Gupta V, Barber M, Goel R. Cyanotoxin impact on microbial-mediated nitrogen transformations at the interface of sediment-water column in surface water bodies. Environ Pollut 2020; 266:115283. [PMID: 32805604 DOI: 10.1016/j.envpol.2020.115283] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/23/2020] [Accepted: 07/26/2020] [Indexed: 06/11/2023]
Abstract
Harmful cyanobacterial blooms produce lethal toxins in many aquatic ecosystems experiencing eutrophication. This manuscript presents results on the effects of cyanotoxins on the aerobic microbial communities residing at the interface of sediments and water columns with the ammonia-oxidizing bacteria (AOB) as the model microbial community. Microcystin-LR (MC-LR), a heavily researched cyanotoxin variant, was used as the model cyanotoxin. To measure cyanotoxin influence on the activity of nitrifying microbial communities, an enriched culture of AOBs collected from an ongoing partial nitrification-nitritation reactor was examined for its exposure to 1, 5 and 10 μg/L of MC-LR. The nitritation kinetics experiment demonstrated MC-LR's ability at 1, 5, and 10 μg/L concentrations to prevent ammonium oxidation with statistically significant differences in nitritation rates between the blanks and spiked samples (One-way ANOVA, p < 0.05). Significantly decreased dissolved oxygen (DO) consumption during oxygen update batch tests demonstrated toxin's influence on AOB's oxidizing capabilities when exposed to even lower concentrations of 0.75, 0.5, and 0.25 μg/L of MC-LR in a separate set of experiments. Based on competitive kinetics, the MC-LR inhibition coefficient-the concentration needed to produce half-maximum inhibition of the mixed community AOBs was determined to be 0.083 μg/L. The stress tests proved the recovery of nitritation to some extent at lower MC-LR concentrations (1 and 5 μg/L), but significant irreversible inhibition was recorded when the AOB population was exposed to 10 μg/L MC-LR. The comparisons of amoA gene expressions corresponded well with nitrifying kinetics. All concentrations of MC-LR spiking were determined to produce a discernible impact on the AOB nitritation rate by either destroying the bacterial cell or immediately inhibiting the amoA gene expression.
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Affiliation(s)
- Hanyan Li
- Department of Civil and Environmental Engineering, University of Utah, UT, USA
| | - Marielle Hollstein
- Department of Civil and Environmental Engineering, University of Utah, UT, USA
| | - Aditi Podder
- Department of Civil and Environmental Engineering, University of Utah, UT, USA
| | | | - Michael Barber
- Department of Civil and Environmental Engineering, University of Utah, UT, USA
| | - Ramesh Goel
- Department of Civil and Environmental Engineering, University of Utah, UT, USA.
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7
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Cheng HH, Pien TT, Lee YC, Lu IC, Whang LM. Effects of copper on biological treatment of NMF- and MDG-containing wastewater from TFT-LCD industry. Chemosphere 2020; 258:127125. [PMID: 32540540 DOI: 10.1016/j.chemosphere.2020.127125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 05/14/2020] [Accepted: 05/18/2020] [Indexed: 06/11/2023]
Abstract
This study aimed to evaluate the effects of copper on N-methylformamide (NMF)- and methyl diglycol (MDG)-containing wastewater treatment using batch experiments and a lab-scale anoxic-oxic (A/O) sequencing batch reactor (SBR). Batch experimental results indicated that aerobic degradation of NMF followed Monod-type kinetics. Copper inhibition on nitrification also followed Monod-type inhibition kinetics with copper-to-biomass ratio instead of copper concentration. Specific degradation rates of NMF and MDG under both aerobic and anoxic conditions decreased in the matrix of full-scale wastewater, and high copper dosage would further reduce the degradation rates. In the long-term presence of 0.5 mg/L copper, the A/O SBR could maintain stable and complete degradations of NMF and MDG, 95% of COD removal, and more than 50% of total nitrogen (TN) removal. High concentrations of copper spikes, including 40 mg/L and 110 mg/L, slowed down degradation rates for both NMF and MDG, but did not affect COD and TN removal efficiencies in the full 24 h-cycle operation. The long-term A/O SBR operation revealed that daily dosage of 0.5 mg/L copper was not detrimental to NMF/MDG degradations due to regularly wasting sludge, but 110 mg/L of copper spike obviously reduced NMF/MDG degradation rate although it could be recovered later by regularly wasting sludge and maintaining SRT at 20 days.
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Affiliation(s)
- Hai-Hsuan Cheng
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan, 701, Taiwan
| | - Tzung-Tsin Pien
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan, 701, Taiwan
| | - Ya-Ching Lee
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan, 701, Taiwan
| | - I-Chun Lu
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan, 701, Taiwan
| | - Liang-Ming Whang
- Department of Environmental Engineering, National Cheng Kung University (NCKU), No. 1, University Road, Tainan, 701, Taiwan; Sustainable Environment Research Laboratory (SERL), National Cheng Kung University (NCKU), No. 1, University Road, Tainan, 701, Taiwan.
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8
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Li H, Yao H, Liu T, Wang B, Xia J, Guo J. Achieving simultaneous nitrogen and antibiotic removal in one-stage partial nitritation-Anammox (PN/A) process. Environ Int 2020; 143:105987. [PMID: 32763631 DOI: 10.1016/j.envint.2020.105987] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 06/10/2020] [Accepted: 07/14/2020] [Indexed: 06/11/2023]
Abstract
Partial nitritation-Anammox (PN/A) process has been recognized as a sustainable process for biological nitrogen removal. Although various antibiotics have been ubiquitously detected in influent of wastewater treatment plants, little is known whether functional microorganisms in the PN/A process are capable of biodegrading antibiotics. This study aimed to investigate simultaneous nitrogen and antibiotic removal in a lab-scale one-stage PN/A system treating synthetic wastewater containing a widely-used antibiotic, sulfadiazine (SDZ). Results showed that maximum total nitrogen (TN) removal efficiency of 86.1% and SDZ removal efficiency of 95.1% could be achieved when treating 5 mg/L SDZ under DO conditions of 0.5-0.6 mg/L. Compared to anammox bacteria, ammonia-oxidizing bacteria (AOB) made a major contribution to SDZ degradation through their cometabolic pathway. A strong correlation between amoA gene and SDZ removal efficiency was found (p < 0.01). In addition, the degradation products of SDZ did not exhibit any inhibitory effects on Escherichia coli. The findings suggest that it is promising to apply the PN/A process to simultaneously remove antibiotics and nitrogen from contaminated wastewater.
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Affiliation(s)
- Huayu Li
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia; Beijing International Scientific and Technological Cooperation Base of Water Pollution Control Techniques for Antibiotics and Resistance Genes, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Department of Municipal and Environmental Engineering, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China
| | - Hong Yao
- Beijing International Scientific and Technological Cooperation Base of Water Pollution Control Techniques for Antibiotics and Resistance Genes, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, Department of Municipal and Environmental Engineering, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China.
| | - Tao Liu
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Bingzheng Wang
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Jun Xia
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Jianhua Guo
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
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9
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Maal-Bared R. Operational impacts of heavy metals on activated sludge systems: the need for improved monitoring. Environ Monit Assess 2020; 192:560. [PMID: 32748335 DOI: 10.1007/s10661-020-08529-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 07/28/2020] [Indexed: 06/11/2023]
Abstract
Biological nutrient removal is highly reliant on maintaining a heterogeneous, balanced, and metabolically active microbial community that can adapt to the fluctuating composition of influent wastewater and encompassing environmental conditions. Maintaining this balance can be challenging in municipal wastewater systems that sporadically receive wastewater from industrial facilities due to the impact of heavy metals and other contaminants on the microbial ecology of the activated sludge. A thorough understanding of the impacts of heavy metals on activated sludge and of practical monitoring options is needed to support decision-making at the wastewater utility level. This paper is divided into two parts. In the first part, the review explains what happens when heavy metals interact with activated sludge systems by highlighting biosorption and bioaccumulation processes, and when an activated sludge system switches from bioaccumulation to toxic shock. Here, it also summarizes the impacts of heavy metal exposure on plant performance. In the second part, the review summarizes practical approaches that can be used at the plant outside the realm of traditional toxicological bioassays testing to determine the possible impacts of influent heavy metal concentrations on the BNR process. These approaches include the following: monitoring operational parameters for major shifts; respirometry; microscopy; ATP; chemical analyses of heavy metals with a focus on synergistic impacts and inhibitory limits; and other novel approaches, such as EPS chemical analyses, molecular techniques, and quorum sensing.
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Affiliation(s)
- Rasha Maal-Bared
- Scientific Services, Quality Assurance and Environment, EPCOR Water Canada, EPCOR Tower, 2000 10423 101 Street, Edmonton, AB, T5H 0E8, Canada.
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Wang B, Ni BJ, Yuan Z, Guo J. Insight into the nitrification kinetics and microbial response of an enriched nitrifying sludge in the biodegradation of sulfadiazine. Environ Pollut 2019; 255:113160. [PMID: 31521996 DOI: 10.1016/j.envpol.2019.113160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 08/27/2019] [Accepted: 09/01/2019] [Indexed: 06/10/2023]
Abstract
The intensive use of antibiotics results in the continuous release of antibiotics into wastewater treatment systems, leading to the spread of antibiotic resistance. Nitrifying system is reported to be capable of degrading antibiotics, yet few studies have systematically investigated the inherent correlation among ammonium oxidation rate, antibiotic degradation and genetic expression of nitrifying bacteria along the process. This study selected a widely used sulfonamide antibiotic, sulfadiazine (SDZ), to investigate its biodegradation potential by an enriched nitrifying culture and the response of nitrifying bacteria against antibiotic exposure. Our results demonstrated that SDZ degradation was mainly contributed by cometabolism of ammonia-oxidizing bacteria (AOB), rather than biomass adsorption. The quantitative reverse transcription PCR (RT-qPCR) analysis revealed that the expression level of amoA gene was down-regulated due to the SDZ exposure. In addition, the degradation products of SDZ did not exhibit inhibitory effect on Escherichia coli K12, indicating the biotoxicity of SDZ could be mitigated after biodegradation. The findings offer insights regarding the biodegradation process of sulfonamide antibiotics via cometabolism by AOB.
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Affiliation(s)
- Bingzheng Wang
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Bing-Jie Ni
- School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Zhiguo Yuan
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Jianhua Guo
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
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11
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Wang B, Ni BJ, Yuan Z, Guo J. Cometabolic biodegradation of cephalexin by enriched nitrifying sludge: Process characteristics, gene expression and product biotoxicity. Sci Total Environ 2019; 672:275-282. [PMID: 30959294 DOI: 10.1016/j.scitotenv.2019.03.473] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 03/14/2019] [Accepted: 03/30/2019] [Indexed: 06/09/2023]
Abstract
The nitrifying systems have been reported to be able to biodegrade micropollutants, yet it is still unclear about the cometabolism of ammonia-oxidizing bacteria (AOB) towards micropollutants, in particular their enzyme and transcriptional responses under exposure of micropollutants. This study investigated cometabolic biodegradation of a selected antibiotic, cephalexin (CFX), by an enriched nitrifying culture through a series of batch experiments, together with the assessments of enzymatic activity, key gene expression, and biotoxicity of the degradation products. More than 99% CFX with an initial concentration of 50 μg/L could be removed with the presence of ammonium, while <44% of CFX removal was observed in the absence of ammonium, suggesting the cometabolic degradation of CFX by ammonia-oxidizing bacteria (AOB). After the addition of 50 μg/L CFX, the ammonia oxidizing rate (AOR) decreased from 36.6 to 11.0 mg N/(L·h·g VSS), followed by a slight recovery when CFX concentration decreased to below 8 μg/L. Ammonia monooxygenase (AMO) activity showed a similar trend with that of AOR. The quantitative reverse transcription PCR assay indicated that the expression level of amoA gene was significantly upregulated (up to 3-fold, p < 0.05) due to the addition of CFX, while decreased to the normal level once CFX was degraded, suggesting a mechanism of AOB to neutralize the toxicity of CFX by metabolizing ammonia more effectively. Meanwhile, the biotoxicity test showed the degradation products of CFX did not exhibit any antibacterial impacts in terms of cell viability, compared to the parent compounds. Our finding shed a light on AMO-mediated cometabolic biodegradation of antibiotics in nitrifying cultures.
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Affiliation(s)
- Bingzheng Wang
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Bing-Jie Ni
- School of Civil and Environmental Engineering, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Zhiguo Yuan
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia
| | - Jianhua Guo
- Advanced Water Management Centre, The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
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12
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Yang X, Liu L, Wang S. A strategy of high-efficient nitrogen removal by an ammonia-oxidizing bacterium consortium. Bioresour Technol 2019; 275:216-224. [PMID: 30590208 DOI: 10.1016/j.biortech.2018.12.057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 12/09/2018] [Accepted: 12/16/2018] [Indexed: 06/09/2023]
Abstract
An ammonia-oxidizing bacterium consortium showed approximately 100% removal of NH4+-N with an initial concentration of 262.28 ± 8.21 mg·L-1 within 10 days, and only 16.54 ± 0.52% of NH4+-N was converted to NO2--N in this study. The consortium removed ammonium by heterotrophic nitrification and aerobic denitrification (HNAD) without N2O emission. The activity of AOB was not affected by low concentrations of FA or FNA, but completely inhibited by 0.04 mg HNO2·L-1. In a bioaugmentation treatment of eutrophic wastewater using the consortium, the removal efficiency of NH4+-N reached 90.85 ± 0.8% and 77.88 ± 1.86% at initial concentrations of 1.80 ± 0.04 mg·L-1 and 40.31 ± 0.57 mg·L-1, respectively, and the dissolved oxygen level had a significant impact on the consortium activity. No significant changes in the bacterial community structure were observed after the consortium addition, and local functional bacteria were enriched by aeration and contributed to ammonium nitrogen removal with AOB.
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Affiliation(s)
- Xiaolong Yang
- Department of Environmental Science and Engineering, Fudan University, 2005 Songhu Road, Shanghai 200433, PR China
| | - Lihua Liu
- Maths & Physics College, Jinggangshan University, 28 Xueyuan Road, Ji'an 343009, PR China
| | - Shoubing Wang
- Department of Environmental Science and Engineering, Fudan University, 2005 Songhu Road, Shanghai 200433, PR China.
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13
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Kapoor V, Phan D, Pasha ABMT. Effects of metal oxide nanoparticles on nitrification in wastewater treatment systems: A systematic review. J Environ Sci Health A Tox Hazard Subst Environ Eng 2018; 53:659-668. [PMID: 29469639 DOI: 10.1080/10934529.2018.1438825] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
While the variety of engineered nanoparticles used in consumer products continues to grow, the use of metal oxide nanoparticles in electronics, textiles, cosmetics and food packaging industry has grown exponentially in recent years, which will inevitably result in their release into wastewater streams in turn impacting the important biological processes in wastewater treatment plants. Among these processes, nitrification play a critical role in nitrogen removal during wastewater treatment, however, it is sensitive to a wide range of inhibitory substances including metal oxide nanoparticles. Therefore, it is essential to systematically asses the effects of metal oxide nanoparticles on nitrification in biological wastewater treatment systems. In this review we discuss the present scenario of metal oxide nanoparticles and their impact on biological wastewater treatment processes, specifically nitrogen removal through nitrification. We also summarize the various methods used to measure nitrification inhibition by metal oxide nanoparticles and highlight corresponding results obtained using those methods. Finally, the key research gaps that need to be addressed in future are discussed.
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Affiliation(s)
- Vikram Kapoor
- a Department of Civil and Environmental Engineering , University of Texas at San Antonio , San Antonio , Texas , USA
| | - Duc Phan
- a Department of Civil and Environmental Engineering , University of Texas at San Antonio , San Antonio , Texas , USA
| | - A B M Tanvir Pasha
- a Department of Civil and Environmental Engineering , University of Texas at San Antonio , San Antonio , Texas , USA
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14
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Che Y, Liang P, Gong T, Cao X, Zhao Y, Yang C, Song C. Elucidation of major contributors involved in nitrogen removal and transcription level of nitrogen-cycling genes in activated sludge from WWTPs. Sci Rep 2017; 7:44728. [PMID: 28294196 DOI: 10.1038/srep44728] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 02/14/2017] [Indexed: 11/30/2022] Open
Abstract
We investigated nitrogen-cycle bacterial communities in activated sludge from 8 municipal wastewater treatment plants (WWTPs). Redundancy analyses (RDA) showed that temperature was the most significant driving force in shaping microbial community structure, followed by influent NH4+ and total nitrogen (TN). The diversity of ammonia oxidizing and nitrite reducing bacteria were investigated by the construction of amoA, nirS and nirK gene clone libraries. Phylogenetic analysis indicated that Thauera and Mesorhizobium were the predominant nitrite reducing bacteria, and Nitrosomonas was the only detected ammonia oxidizing bacteria in all samples. Quantification of transcription level of nirS and nirK genes indicated that nirS-type nitrite reducing bacteria played the dominant roles in nitrite reduction process. Transcription level of nirS gene positively correlated with influent NH4+ and TN significantly, whereas inversely linked with hydraulic retention time. Temperature had a strong positive correlation to transcription level of amoA gene. Overall, this study deepened our understanding of the major types of ammonia oxidizing and nitrite reducing bacteria in activated sludge of municipal WWTPs. The relationship between transcription level of nitrogen-cycle genes and operational or environmental variables of WWTPs revealed in this work could provide guidance for optimization of operating parameters and improving the performance of nitrogen removal.
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15
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Friedrichs F, Rudolph KU, Nguyen BH, Meinardi D, Genthe W, Trung DQ. Improving the sensitivity of the activated sludge respiration inhibition test and verifying the results using an oxidation-reduction potential electrode. Water Sci Technol 2017; 75:247-254. [PMID: 28112651 DOI: 10.2166/wst.2016.468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The inhibition of activated sludge respiration is one of the most important parameters for monitoring wastewater toxicity. The main objective of this study was to improve respiration inhibition testing in order to protect the biological degradation within the aerobic process in a wastewater treatment plant more efficiently. In order to influence the sensitivity of the testing bacteria, two different nutrient solutions were selected for biological testing, synthetic wastewater according to ISO 8192 and NaAc (sodium acetate). The effects of the nutrient solutions on heavy metal speciation and their respiration inhibition were investigated. The toxicants Zn(II), Cu(II), Cr(VI) and 3,5 DCP (3,5-dichlorophenol) were used as standards to determine toxicities and to study the influence of nutrient solutions. Results have shown that NaAc as a nutrient solution sensitized the respiration inhibition test up to a factor of 7.7. Furthermore, an oxidation reduction potential electrode can be used as an alternative tool to verify the results obtained with an oxygen sensor.
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Affiliation(s)
- F Friedrichs
- VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi, Vietnam; Research and Development Department, LAR Process Analysers AG, Neuköllnische Allee 134, Berlin 12057, Germany E-mail:
| | - K U Rudolph
- IEEM gGmbH - Institute of Environmental Engineering and Management at Witten/Herdecke University, Alfred-Herrhausen-Str. 44, Witten 58455, Germany
| | - Bich Hanh Nguyen
- VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi, Vietnam
| | - D Meinardi
- IEEM gGmbH - Institute of Environmental Engineering and Management at Witten/Herdecke University, Alfred-Herrhausen-Str. 44, Witten 58455, Germany
| | - W Genthe
- Research and Development Department, LAR Process Analysers AG, Neuköllnische Allee 134, Berlin 12057, Germany E-mail:
| | - D Q Trung
- VNU University of Science, 334 Nguyen Trai, Thanh Xuan, Ha Noi, Vietnam
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16
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Kapoor V, Elk M, Li X, Santo Domingo J. Inhibitory effect of cyanide on wastewater nitrification determined using
SOUR
and
RNA
‐based gene‐specific assays. Lett Appl Microbiol 2016; 63:155-61. [DOI: 10.1111/lam.12603] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 06/06/2016] [Accepted: 06/07/2016] [Indexed: 11/29/2022]
Affiliation(s)
- V. Kapoor
- Oak Ridge Institute for Science and Education Oak Ridge TN USA
- U.S. Environmental Protection Agency, Office of Research and Development Cincinnati OH USA
| | - M. Elk
- Pegasus Technical Services, Inc. Cincinnati OH USA
| | - X. Li
- Oak Ridge Institute for Science and Education Oak Ridge TN USA
- U.S. Environmental Protection Agency, Office of Research and Development Cincinnati OH USA
| | - J.W. Santo Domingo
- U.S. Environmental Protection Agency, Office of Research and Development Cincinnati OH USA
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