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Chen CX, Koskue V, Duan H, Gao L, Shon HK, Martin GJO, Chen GQ, Freguia S. Impact of nutrient deficiency on biological sewage treatment - Perspectives towards urine source segregation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174174. [PMID: 38925384 DOI: 10.1016/j.scitotenv.2024.174174] [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: 04/10/2024] [Revised: 05/30/2024] [Accepted: 06/19/2024] [Indexed: 06/28/2024]
Abstract
Human urine contains 9 g/L of nitrogen (N) and 0.7 g/L of phosphorus (P). The recovery of N and P from urine helps close the nutrient loop and increase resource circularity in the sewage treatment sector. Urine contributes an average of 80 % N and 50 % P in sewage, whereby urine source segregation could reduce the burden of nutrient removal in sewage treatment plants (STPs) but result in N and P deficiency and unintended negative consequences. This review examines the potential impacts of N and P deficiency on the removal of organic carbon and nutrients, sludge characteristics and greenhouse gas emissions in activated sludge processes. The details of how these impacts affect the operation of STPs were also included. This review helps foresee operational challenges that established STPs may face when dealing with nutrient-deficient sewage in a future where source separation of urine is the norm. The findings indicate that the requirement of nitrification-denitrification and biological P removal processes could shrink at urine segregation above 80 % and 100 %, respectively. Organic carbon, N and biological P removal processes can be severely affected under full urine segregation. The decrease in solid retention time due to urine segregation increases treatment capacity up to 48 %. Sludge flocculation and settleability would deteriorate due to changes in extracellular polymeric substances and induce various forms of bulking. Beneficially, N deficiency reduces nitrous oxide emissions. These findings emphasise the importance of considering and preparing for impacts caused by urine source segregation-induced nutrient deficiency in sewage treatment processes.
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Affiliation(s)
- Chee Xiang Chen
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Veera Koskue
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Haoran Duan
- School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia; Australian Centre for Water and Environmental Biotechnology (formerly AWMC), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Li Gao
- South East Water Corporation, 2268, Seaford, VIC 3198, Australia
| | - Ho Kyong Shon
- Centre for Technology in Water and Wastewater (CTWW), School of Civil and Environmental Engineering, University of Technology, Sydney (UTS), Broadway, NSW 2007, Australia
| | - Gregory J O Martin
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
| | - George Q Chen
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Stefano Freguia
- Department of Chemical Engineering, The University of Melbourne, Parkville, VIC 3010, Australia.
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Wang H, Miao J, Sun Y. Aerobic nitrous oxide emission in anoxic/aerobic and intermittent aeration sequencing batch reactors. ENVIRONMENTAL TECHNOLOGY 2024; 45:1449-1458. [PMID: 36331189 DOI: 10.1080/09593330.2022.2144467] [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: 04/25/2022] [Accepted: 10/28/2022] [Indexed: 06/16/2023]
Abstract
This study characterized nitrogen removal and nitrous oxide (N2O) emissions from lab-scale anoxic/aerobic sequencing batch reactor (AOSBR) and intermittent aeration sequencing batch reactor (IASBR), respectively, for treating synthetic municipal wastewater. The N2O emission was evaluated in a simulated cycle, and batch conditions of aerobic nitrification, simultaneous nitrification and denitrification (SND), and aerobic denitrification. The results show that nitrogen removal was enhanced in IASBR compared to AOSBR, with 94.2% and 67.9% of total inorganic nitrogen removal efficiency in IASBR and AOSBR, respectively. In the simulated cycle, the emission factors (of oxidized ammonium) were 4.9% and 0.6% in AOSBR and IASBR, respectively. Under batch conditions, the N2O emission factors during SND were obviously higher than that during aerobic nitrification and denitrification. The N2O emission factors during SND ranging 0.68-11.68% in AOSBR and 1.25-5.13% in IASBR. Furthermore, N2O emission under batch conditions was affected by the aeration ratios. Moderate and high aeration ratios used in this study stimulated the N2O emission from SND. The N2O emission was enhanced with the nitrite accumulation during aerobic nitrification when the nitrite-oxidizing bacteria was inhibited by a chemical inhibitor. Aerobic denitrification via nitrite could be the main pathway of N2O generation from SND processes. The findings from our study can help further understand N2O emission mechanisms and guide the optimization of the current wastewater treatment process for minimizing N2O emission.
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Affiliation(s)
- Huoqing Wang
- State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology, Shenzhen Academy of Environmental Science, Shenzhen, People's Republic of China
| | - Jia Miao
- Japan Research Center for Environmental Quality Management, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Yuepeng Sun
- Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA, USA
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Kou L, Huang T, Zhang H, Li K, Hua F, Huang C, Liu X, Si F. Water-lifting and aeration system improves water quality of drinking water reservoirs: Biological mechanism and field application. J Environ Sci (China) 2023; 129:174-188. [PMID: 36804234 DOI: 10.1016/j.jes.2022.09.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 09/02/2022] [Accepted: 09/03/2022] [Indexed: 06/18/2023]
Abstract
Reservoirs have been served as the major source of drinking water for dozens of years. The water quality safety of large and medium reservoirs increasingly becomes the focus of public concern. Field test has proved that water-lifting and aeration system (WLAS) is a piece of effective equipment for in situ control and improvement of water quality. However, its intrinsic bioremediation mechanism, especially for nitrogen removal, still lacks in-depth investigation. Hence, the dynamic changes in water quality parameters, carbon source metabolism, species compositions and co-occurrence patterns of microbial communities were systematically studied in Jinpen Reservoir within a whole WLAS running cycle. The WLAS operation could efficiently reduce organic carbon (19.77%), nitrogen (21.55%) and phosphorus (65.60%), respectively. Biolog analysis revealed that the microbial metabolic capacities were enhanced via WLAS operation, especially in bottom water. High-throughput sequencing demonstrated that WLAS operation altered the diversity and distributions of microbial communities in the source water. The most dominant genus accountable for aerobic denitrification was identified as Dechloromonas. Furthermore, network analysis revealed that microorganisms interacted more closely through WLAS operation. Oxidation-reduction potential (ORP) and total nitrogen (TN) were regarded as the two main physicochemical parameters influencing microbial community structures, as confirmed by redundancy analysis (RDA) and Mantel test. Overall, the results will provide a scientific basis and an effective way for strengthening the in-situ bioremediation of micro-polluted source water.
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Affiliation(s)
- Liqing Kou
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
| | - Tinglin Huang
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China.
| | - Haihan Zhang
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
| | - Kai Li
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
| | - Fengyao Hua
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
| | - Cheng Huang
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
| | - Xiang Liu
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
| | - Fan Si
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; Collaborative Innovation Center of Water Pollution Control and Water Quality Security Assurance of Shaanxi Province, Xi'an 710055, China
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Abulimiti A, Wang X, Kang J, Li L, Wu D, Li Z, Piao Y, Ren N. The trade-off between N 2O emission and energy saving through aeration control based on dynamic simulation of full-scale WWTP. WATER RESEARCH 2022; 223:118961. [PMID: 35973249 DOI: 10.1016/j.watres.2022.118961] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 08/05/2022] [Accepted: 08/06/2022] [Indexed: 06/15/2023]
Abstract
This study investigated the trade-off between energy saving and N2O emission reduction of WWTP under the precise control of dissolved oxygen (DO) concentration through model simulation. A long-term dynamic model for full-scale WWTP GHG emissions was established and calibrated with monitored year-round hourly water quality data to quantify the annual GHG emissions from WWTP. Results showed that N2O dominated the direct emission, up to 76.1%, and the variability of N2O generation could better be revealed by dynamic simulation. Furthermore, GHG emissions of the WWTP were mainly contributed by electric energy, among which the blower consumes the most electricity. To reduce the electricity consumption of blowers, improve mechanical efficiency and reduce DO concentration should be considered. DO setting played a significant role in the N2O and CH4 emission, electricity consumption and effluent quality, which was challenging to balance. The ultralow-oxygen (0-1/0.2-1 mg/L) and low oxygen (1-2 mg/L) control strategies were proposed, and their effects on total GHG emissions and effluent water quality were discussed. If the anaerobic environment (DO<0.2 mg/L)could be avoided, the control frequency (high and low) of the DO set-point did not have a significant effect on the emissions of N2O and CH4 and the effluent quality. The ultralow-oxygen strategy (0.2-1 mg/L) with a high-frequency control strategy achieved the lowest GHG emissions under the current energy mix. However, by 2050, as the energy supply gets cleaner, the total GHG emissions of WWTPs with ultralow-oxygen aeration (0.2-1 mg/L) will exceed low-oxygen aeration by 3.6%-4.2%, as N2O dominates 61.6%. Therefore, considering the trade-off between N2O emission and energy saving in WWTP, ultralow-oxygen aeration is a transition scheme to cleaner energy.
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Affiliation(s)
- Aliya Abulimiti
- State key Laboratory of urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Xiuheng Wang
- State key Laboratory of urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China.
| | - Jinhao Kang
- State key Laboratory of urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Lanqing Li
- State key Laboratory of urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Dan Wu
- Longjiang Environmental Protection Group Co., Ltd, Harbin 150090, China
| | - Zhe Li
- Longjiang Environmental Protection Group Co., Ltd, Harbin 150090, China
| | - Yitong Piao
- Beijing SequoiaLibra Technology Development Co., Ltd, Beijing 100000, China
| | - Nanqi Ren
- State key Laboratory of urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Environment, Harbin Institute of Technology, Harbin 150090, China
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Tian Z, Zhou N, You W, He D, Chang F, Zheng M. Mitigating NO and N 2O emissions from a pilot-scale oxidation ditch using bioaugmentation of immobilized aerobic denitrifying bacteria. BIORESOURCE TECHNOLOGY 2021; 340:125704. [PMID: 34375792 DOI: 10.1016/j.biortech.2021.125704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 07/27/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Nitrous oxide (N2O) emission from wastewater treatment plants (WWTPs) requires urgent mitigation because of its significant contribution to the greenhouse effect. In this study, bioaugmentation was applied in a pilot-scale oxidation ditch with the aerobic denitrifying bacteria strain PCN-1 immobilized on polyurethane biocarriers, which demonstrated effective N2O mitigation. Microbial community analysis suggested that the bioaugmentation facilitated a symbiotic relationship of the bacterial populations between the activated sludge and the biocarriers. The denitrifying bacteria with well-known N2O reducing capabilities predominated on the biocarriers. Correspondingly, the increases of denitrifying genes and NO and N2O reductase provided evidence for the enhanced genetic potential for NO and N2O reduction. Besides, the enriched comammox Nitrospira on the biocarriers is proposed as another significant driver for N2O mitigation by avoiding nitrite accumulation. In addition, the bioaugmentation enhanced the stability and recovery capability of the system in the ammonia overload and aeration failure shock tests.
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Affiliation(s)
- Zhichao Tian
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing 102206, China
| | - Nan Zhou
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Wenbo You
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing 102206, China
| | - Da He
- Key Laboratory of Ecological Impacts of Hydraulic Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan, China
| | - Fang Chang
- Marine Resources Research Centre, Tianjin Research Institute for Water Transport Engineering, M.O.T., Tianjin 300456, China
| | - Maosheng Zheng
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing 102206, China.
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Li J, Chen Q, Li Q, Zhao C, Feng Y. Influence of plants and environmental variables on the diversity of soil microbial communities in the Yellow River Delta Wetland, China. CHEMOSPHERE 2021; 274:129967. [PMID: 33979943 DOI: 10.1016/j.chemosphere.2021.129967] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Revised: 01/23/2021] [Accepted: 02/09/2021] [Indexed: 05/20/2023]
Abstract
Microorganisms play an important role in the biogeochemical cycle and ecological function regulation of wetlands, have a major impact on global climate change and are critical for maintaining the health of the global ecosystem. In order to investigate the relationships among plants, environmental variables, and microbial communities in coastal wetlands in the Yellow River Delta, we selected soils growing plants such as Suaeda salsa, Tamarix chinensis, Phragmites australis, and cotton etc. The results show that there were differences in microbial diversity among areas with different vegetation cover and the microbial abundance in Phragmites australis and Tamarix chinensis areas was higher than that in mudflat, Suaeda glauca and cotton field, plants increased the diversity of soil microorganisms. The structure and diversity of soil microorganisms were significantly higher than that of endophytes. The Shannon index of soil bacteria was about 4-5.5, while that of endophytes was about 0-4. The soil bacteria were mainly Firmicutes, Proteobacteria, Bacteroidetes and Actinobacteria, accounting for more than 90.0% in all samples. The Mn4+, Fe3+ and hydrolytic nitrogen contents in the soil of vegetation covered areas was lower than that of the bare beach, the content of hydrolytic nitrogen in Phragmites australis area was generally higher, and the content of SO42- and NO2- in the area was lowest near oil fields. Redundancy analysis shows that the explanatory rates of environmental factors at the phylum and genus levels were 89.70% and 86.80%, respectively, and K (23.40%), NO2- (11.80%), Mn4+ (9.80%) and Na (8.00%) were the main factors explaining the structural changes and composition of microbial flora at the phylum level. This study provides an ecological perspective for understanding the influence mechanism between wetland microbial diversity and wetland ecosystem function. It is helpful for us to understand the interactions among plants, environmental variables, and microbial communities in the coastal wetland of the Yellow River Delta, and has important guiding significance for the scientific research of soil environmental remediation in the degraded coastal wetland of the Yellow River Delta.
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Affiliation(s)
- Jinye Li
- Key Laboratory for Applied Technology of Sophisticated Analytical Instrument of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, PR China
| | - Qingfeng Chen
- Key Laboratory for Applied Technology of Sophisticated Analytical Instrument of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, PR China; College of Geography and Environment, Shandong Normal University, Jinan, 250014, PR China.
| | - Qing Li
- Key Laboratory for Applied Technology of Sophisticated Analytical Instrument of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, PR China
| | - Changsheng Zhao
- Key Laboratory for Applied Technology of Sophisticated Analytical Instrument of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, PR China
| | - You Feng
- Key Laboratory for Applied Technology of Sophisticated Analytical Instrument of Shandong Province, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250014, PR China
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Duan H, Zhao Y, Koch K, Wells GF, Zheng M, Yuan Z, Ye L. Insights into Nitrous Oxide Mitigation Strategies in Wastewater Treatment and Challenges for Wider Implementation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:7208-7224. [PMID: 33975433 DOI: 10.1021/acs.est.1c00840] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nitrous oxide (N2O) emissions account for the majority of the carbon footprint of wastewater treatment plants (WWTPs). Many N2O mitigation strategies have since been developed while a holistic view is still missing. This article reviews the state-of-the-art of N2O mitigation studies in wastewater treatment. Through analyzing existing studies, this article presents the essential knowledge to guide N2O mitigations, and the logics behind mitigation strategies. In practice, mitigations are mainly carried out by aeration control, feed scheme optimization, and process optimization. Despite increasingly more studies, real implementation remains rare, which is a combined result of unclear climate change policies/incentives, as well as technical challenges. Five critical technical challenges, as well as opportunities, of N2O mitigations were identified. It is proposed that (i) quantification methods for overall N2O emissions and pathway contributions need improvement; (ii) a reliable while straightforward mathematical model is required to quantify benefits and compare mitigation strategies; (iii) tailored risk assessment needs to be conducted for WWTPs, in which more long-term full-scale trials of N2O mitigation are urgently needed to enable robust assessments of the resulting operational costs and impact on nutrient removal performance; (iv) current mitigation strategies focus on centralized WWTPs, more investigations are warranted for decentralised systems, especially decentralized activated sludge WWTPs; and (v) N2O may be mitigated by adopting novel strategies promoting N2O reduction denitrification or microorganisms that emit less N2O. Overall, we conclude N2O mitigation research is reaching a maturity while challenges still exist for a wider implementation, especially in relation to the reliability of N2O mitigation strategies and potential risks to nutrient removal performances of WWTPs.
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Affiliation(s)
- Haoran Duan
- School of Chemical Engineering, the University of Queensland, St. Lucia, Queensland 4072, Australia
- Advanced Water Management Centre (AWMC), the University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Yingfen Zhao
- School of Chemical Engineering, the University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Konrad Koch
- Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coulombwall 3, 85748 Garching, Germany
| | - George F Wells
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Min Zheng
- Advanced Water Management Centre (AWMC), the University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Zhiguo Yuan
- Advanced Water Management Centre (AWMC), the University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Liu Ye
- School of Chemical Engineering, the University of Queensland, St. Lucia, Queensland 4072, Australia
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Zheng M, Zhou N, He S, Chang F, Zhong J, Xu S, Wang Z, Liu T. Nitrous oxide (N 2O) emissions from a pilot-scale oxidation ditch under different COD/N ratios, aeration rates and two shock-load conditions. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 280:111657. [PMID: 33229113 DOI: 10.1016/j.jenvman.2020.111657] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 09/23/2020] [Accepted: 11/06/2020] [Indexed: 06/11/2023]
Abstract
Nitrous oxide (N2O) generated from wastewater treatment plants (WWTPs) has drawn attention due to its high emission load and significant greenhouse effect. In the present study, N2O emissions from a pilot-scale Carrousel oxidation ditch under various chemical oxygen demand (COD) to nitrogen ratio (COD/N) and aeration rates were systematically investigated. The highest N2O emission factor was 0.142 ± 0.013%, at COD/N of 5 and aeration rate of 1.8 m3 h-1, which was much lower than the majority of previous studies. The results could be attributed to the high internal recycle ratio of the oxidation ditch process which lightened the burden of influent load to the system. The profiles of N2O emissions and dissolved N2O concentration along the channels showed a distinct spatial variation that N2O emissions primarily occurred in the aeration zones due to the air stripping effect. However, both the aeration and anoxic zones contributed to N2O generation due to autotrophic nitrification (AN), which was considered to be the main N2O generation process. In addition, two simulated shock-load conditions, ammonia overload shock and aeration failure shock, were carried out to explore the response of the biological nitrogen removal (BNR) system. The results indicated that both shock-loads lead to excessive N2O emissions, especially at higher aeration rates, which could be explained by the improved N2O generation by AN process during the shock-load period. This study offered new insights into the role of operational parameters to N2O emission and the alternative approach for N2O mitigation during both the steady-state operation and shock-load conditions in the oxidation ditch process.
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Affiliation(s)
- Maosheng Zheng
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Nan Zhou
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Shishi He
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Fang Chang
- Marine Resources Research Centre, Tianjin Research Institute for Water Transport Engineering, M.O.T., Tianjin, 300456, China
| | - Jie Zhong
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Shuo Xu
- Beijing Municipal Environmental Monitoring Center, Beijing, 100048, China
| | - Zhe Wang
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing, 102206, China
| | - Tang Liu
- College of Environmental Sciences and Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China.
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Minimization of N2O Emission through Intermittent Aeration in a Sequencing Batch Reactor (SBR): Main Behavior and Mechanism. WATER 2021. [DOI: 10.3390/w13020210] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To explore the main behavior and mechanism of minimizing nitrous oxide (N2O) emission through intermittent aeration during wastewater treatment, two lab-scale sequencing batch reactors operated at intermittently aerated mode (SBR1), and continuously aerated mode (SBR2) were established. Compared with SBR2, the intermittently aerated SBR1 reached not only a higher total nitrogen removal efficiency (averaged 93.5%) but also a lower N2O-emission factor (0.01–0.53% of influent ammonia), in which short-cut nitrification and denitrification were promoted. Moreover, less accumulation and consumption of polyhydroxyalkanoates, a potential endogenous carbon source promoting N2O emission, were observed in SBR1. Batch experiments revealed that nitrifier denitrification was the major pathway generating N2O while heterotrophic denitrification played as a sink of N2O, and SBR1 embraced a larger N2O-mitigating capability. Finally, quantitative polymerase chain reaction results suggested that the abundant complete ammonia oxidizer (comammox) elevated in the intermittently aerated environment played a potential role in avoiding N2O generation during wastewater treatment. This work provides an in-depth insight into the utilization of proper management of intermittent aeration to control N2O emission from wastewater treatment plants.
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Chen H, Zeng L, Wang D, Zhou Y, Yang X. Recent advances in nitrous oxide production and mitigation in wastewater treatment. WATER RESEARCH 2020; 184:116168. [PMID: 32683143 DOI: 10.1016/j.watres.2020.116168] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/17/2020] [Accepted: 07/10/2020] [Indexed: 05/21/2023]
Abstract
Nitrous oxide (N2O) emitted from wastewater treatment plants has caused widespread concern. Over the past decade, people have made tremendous efforts to discover the microorganisms responsible for N2O production, elucidate metabolic pathways, establish production models and formulate mitigation strategies. The ultimate goal of all these efforts is to shed new light on how N2O is produced and how to reduce it, and one of the best ways is to find key opportunities by integrating the information obtained. This review article critically evaluates the knowledge gained in the field within a decade, especially in N2O production microbiology, biochemistry, models and mitigation strategies, with a focus on denitrification. Previous research has greatly deepened the understanding of the N2O generation mechanism, but further efforts are still needed due to the lack of standardized methodology for establishing N2O mitigation strategies in full-scale systems. One of the challenges seems to be to convert the denitrification process from a net N2O source into an effective sink, which is recommended as a key opportunity to reduce N2O production in this review.
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Affiliation(s)
- Hongbo Chen
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
| | - Long Zeng
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
| | - Yaoyu Zhou
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Xiao Yang
- Korea Biochar Research Center, O-Jeong Eco-Resilience Institute & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, South Korea
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Nie H, Liu X, Dang Y, Ji Y, Sun D, Smith JA, Holmes DE. Efficient nitrous oxide recovery from incineration leachate by a nosZ-deficient strain of Pseudomonas aeruginosa. BIORESOURCE TECHNOLOGY 2020; 297:122371. [PMID: 31753601 DOI: 10.1016/j.biortech.2019.122371] [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: 09/18/2019] [Revised: 11/01/2019] [Accepted: 11/02/2019] [Indexed: 06/10/2023]
Abstract
In this study, nitrous oxide was recovered from a lab-scale moving-bed biofilm reactor (MBBR) treating partial nitrification-treated leachate supplemented with a nosZ-deficient strain of Pseudomonas aeruginosa. Batch culture tests with the nosZ-deficient strain determined that the threshold for free nitrous acid (FNA) inhibition was 0.016 mg/L and that FNA concentrations above this threshold severely inhibited denitrification and transcription of genes from the dissimilatory nitrate reduction pathway (narG, nirS, and norB). High nitrite removal and N2O conversion efficiencies (>95%) were achieved with long-term operation of this MBBR. N2O accounted for the majority of biogas (80%) produced when the MBBR was fed partial nitrification-treated leachate with high nitrite concentrations and the drainage ratio was adjusted to 30%. Bacterial community analysis revealed that the nosZ-deficient Pseudomonas strain remained metabolically active and was primarily responsible for denitrification processes in the reactor. This study presents a promising method for N2O recovery from incineration leachate.
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Affiliation(s)
- Hanbing Nie
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Xinying Liu
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Yan Dang
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Yanan Ji
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Dezhi Sun
- Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
| | - Jessica A Smith
- Department of Biomolecular Sciences, Central Connecticut State University, 1615 Stanley Street, New Britain, CT 06050, United States
| | - Dawn E Holmes
- Department of Physical and Biological Sciences, Western New England University, 1215 Wilbraham Rd, Springfield, MA 01119, United States
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12
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Fenu A, Wambecq T, de Gussem K, Weemaes M. Nitrous oxide gas emissions estimated by liquid-phase measurements: robustness and financial opportunity in single and multi-point monitoring campaigns. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:890-898. [PMID: 31820232 DOI: 10.1007/s11356-019-07047-0] [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: 03/28/2019] [Accepted: 11/12/2019] [Indexed: 06/10/2023]
Abstract
A liquid-phase nitrous oxide sensor can be used as a proxy to estimate the gas emissions. Experiments conducted in a pilot-scale Anammox reactor, at different degrees of aeration intermittency, indicate a predictive error in the range of 13.4-19.3% during the stripping phase, with a higher error range in the unaerated phases (23.4-62.8%). The total emissions not explained by the aerated model amounted to 14.1%. Only a negligible fraction (3.6%) of the total nitrous oxide emissions were not captured by the unaerated phase model, indicating thus a minor concern for full-scale application. A sensitivity analysis performed on the present study indicates that the quality of the nitrous oxide measurement is of extreme importance to decrease the load prediction uncertainty. Air flow measurement errors have lower impact on the overall load prediction. The financial attractivity of this monitoring approach is significant in completely mixed tank reactors. In presence of a multi-point analysis, and starting from two monitoring points, the financial interest deteriorates by the relatively short lifetime of the commercially available liquid-phase nitrous oxide sensor.
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Affiliation(s)
- Alessio Fenu
- Aquafin NV, R&D, Dijkstraat 8, 2610, Aartselaar, Belgium.
| | - Tom Wambecq
- Aquafin NV, R&D, Dijkstraat 8, 2610, Aartselaar, Belgium
| | - Kris de Gussem
- Aquafin NV, R&D, Dijkstraat 8, 2610, Aartselaar, Belgium
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13
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Zeng L, Chen H, Liu L, Zhou Q, Wang D. Reducing nitrous oxide emission in a sequencing batch reactor operated as static/aerobic/anoxic (SOA) process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 693:133619. [PMID: 31376759 DOI: 10.1016/j.scitotenv.2019.133619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/25/2019] [Accepted: 07/25/2019] [Indexed: 06/10/2023]
Abstract
The static/aerobic/anoxic (SOA) activated sludge process was implemented to investigate the nitrous oxide (N2O) emission characteristics with the conventional anaerobic/anoxic/oxic (A2/O) process as a control group. Although the SOA process can achieve substantial biological nutrient removal (BNR), its N2O emission was increased compared with the traditional A2/O process. The improvement of the SOA process was carried out by shortening the static time from 60 min to 15 min. SOA with 30-min static time had an advantage over that with 60-min static time in N2O mitigation with emission factors decreasing from 7.32% to 3.69% of total nitrogen removed and proved more effective in phosphorus removal than the 15-min static time process. 30-min static time induced more eternal carbon sources consumed in the inception of the aerobic phase, which induced less N2O generation in the SOA process. The results demonstrated that the modified SOA could be an alternative process for BNR and N2O mitigation.
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Affiliation(s)
- Long Zeng
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Hongbo Chen
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
| | - Lin Liu
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Qiongzhi Zhou
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
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14
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Guo J, Cong Q, Zhang L, Meng L, Ma F, Zhang J. Exploring the linkage between bacterial community composition and nitrous oxide emission under varied DO levels through the alternation of aeration rates in a lab-scale anoxic-oxic reactor. BIORESOURCE TECHNOLOGY 2019; 291:121809. [PMID: 31344630 DOI: 10.1016/j.biortech.2019.121809] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/08/2019] [Accepted: 07/12/2019] [Indexed: 06/10/2023]
Abstract
Dissolved oxygen (DO) level is crucial in shaping bacterial community and impacts biological nitrogen removal and nitrous oxide (N2O) emission. Online gaseous and off-line dissolved N2O under varying DO levels through aeration rate alternations were measured in lab-scale anoxic-oxic reactors. It showed that sharp changes in DO levels caused immediate N2O emission increase, while the total average gaseous N2O emission stabilized at 0.011%, 0.046%, 0.308% and 0.229% of influent nitrogen as DO in oxic tanks averaged at 0.58, 1.67, 3.2 and 6.12 mg/L, respectively. Process with an average DO concentration of 1.67 mg/L had the highest microbial diversity and relative abundances of potential denitrifers and ammonia-oxidizing bacteria (NOB), while the least ammonia-oxidizing bacteria (AOB) were detected, which contributed to efficient nitrogen removal and minor N2O emission. In conclusion, regulation and control of denitrifiers, AOB and NOB with the determination of a proper DO set point is feasible for N2O mitigation.
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Affiliation(s)
- Jingbo Guo
- School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China.
| | - Qiwei Cong
- School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Lanhe Zhang
- School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Lingwei Meng
- School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Jian Zhang
- School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China
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15
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Zhou N, Dang C, Zhao Z, He S, Zheng M, Liu W, Wang X. Role of sludge retention time in mitigation of nitrous oxide emission from a pilot-scale oxidation ditch. BIORESOURCE TECHNOLOGY 2019; 292:121961. [PMID: 31419708 DOI: 10.1016/j.biortech.2019.121961] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 08/01/2019] [Accepted: 08/04/2019] [Indexed: 06/10/2023]
Abstract
Nitrous oxide (N2O) emission from wastewater treatment plants (WWTPs) has become a focus of attention due to its significant greenhouse effect. In this study, the role of sludge retention time (SRT) in mitigation of N2O emission from a pilot-scale oxidation ditch was systematically investigated. The activated sludge system that operated at SRT of 25 days demonstrated significantly lower N2O emission factor, higher resistance to ammonia overload and aeration failure shock than those obtained at SRT of 15 days no matter which hydraulic retention time (HRT) was adopted. Batch experiments revealed that nitrifier denitrification (ND) was the primary mechanism of N2O generation. However, more microbes affiliated with Nitrospira genera were harbored in the system at SRT 25 d, which could effectively avoid nitrite accumulation, a key factor promoting N2O generation by ND. PICRUSt results further suggested the system at SRT 25 d possessed higher genetic potential for N2O reduction reflected by the more abundant nitrous-oxide reductase.
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Affiliation(s)
- Nan Zhou
- MOE Key Laboratory of Regional Energy Systems Optimization, Environmental Research Academy, North China Electric Power University, Beijing 102206, China
| | - Chenyuan Dang
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Zhirong Zhao
- MOE Key Laboratory of Regional Energy Systems Optimization, Environmental Research Academy, North China Electric Power University, Beijing 102206, China
| | - Shishi He
- MOE Key Laboratory of Regional Energy Systems Optimization, Environmental Research Academy, North China Electric Power University, Beijing 102206, China
| | - Maosheng Zheng
- MOE Key Laboratory of Regional Energy Systems Optimization, Environmental Research Academy, North China Electric Power University, Beijing 102206, China.
| | - Wen Liu
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Xiangke Wang
- MOE Key Laboratory of Regional Energy Systems Optimization, Environmental Research Academy, North China Electric Power University, Beijing 102206, China
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16
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Zhou N, Zhao Z, Wang H, Chen X, Wang M, He S, Liu W, Zheng M. The effects of graphene oxide on nitrification and N 2O emission: Dose and exposure time dependent. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 252:960-966. [PMID: 31252134 DOI: 10.1016/j.envpol.2019.06.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/09/2019] [Accepted: 06/03/2019] [Indexed: 06/09/2023]
Abstract
With the extensive application of graphene oxide (GO), its leakage and release into wastewater treatment plants become inevitable. However, the toxicity of graphene oxide (GO) on nitrification process and the underlying mechanisms still remain unclear. In this study, the toxic effects of GO at concentration of 10 and 100 mg/L in 4 h and 10 days were evaluated with sealed reactors operated in sequencing batch mode. In the initial 4 h, both GO concentrations showed no negative effect on nitrogen conversion. However, the exposure to 100 mg/L GO significantly weakened the NH+ 4-N and NO- 2-N conversion capabilities and intensified the nitrous oxide (N2O) generation after 10 days. Extracellular polymeric substance (EPS) analysis suggested that 100 mg/L GO decreased the protein content of the nitrifying activated sludge. Moreover, reactive oxygen species (ROS) level was promoted by 100 mg/L GO owing to the impaired endogenous antioxidant enzymes including superoxide dismutase (SOD) and catalase (CAT), which caused oxidative stress to bacteria. Finally, quantitative PCR results confirmed that nitrite-oxidizing bacteria (NOB) and complete ammonia oxidizing bacteria (CAOB) were more sensitive to GO, which was the primary cause for the significant promotion of N2O generation in the high GO concentration. This study offered new insights in the toxicity of GO on nitrification and N2O generation in the terms of dose and exposure time.
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Affiliation(s)
- Nan Zhou
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China
| | - Zhirong Zhao
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China
| | - Huihui Wang
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China
| | - Xiangyu Chen
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China
| | - Mingyuan Wang
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China
| | - Shishi He
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China
| | - Wen Liu
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Maosheng Zheng
- College of Environmental Science and Engineering, North China Electric Power University, The Key Laboratory of Resources and Environmental Systems Optimization, Ministry of Education, Beijing, 102206, China.
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17
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Li C, Liu S, Ma T, Zheng M, Ni J. Simultaneous nitrification, denitrification and phosphorus removal in a sequencing batch reactor (SBR) under low temperature. CHEMOSPHERE 2019; 229:132-141. [PMID: 31078028 DOI: 10.1016/j.chemosphere.2019.04.185] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 04/23/2019] [Accepted: 04/24/2019] [Indexed: 05/14/2023]
Abstract
Simultaneous nitrogen and phosphorus removal in winter is one of the great challenges in wastewater treatment processes due to the poor bioactivity of microbial communities. In this study, excellent performance of simultaneous nitrification, denitrification and phosphorus removal (SNDPR) was achieved at low temperature of 10 °C and COD/N ratio of 6 in a lab-scale sequencing batch reactor. Total nitrogen (TN) and phosphorus (TP) removal efficiency reached 89.6% and 97.5%, respectively, accompanied with N2O emission of 7.46% TN due to the primary contribution (70%) of nitrifier denitrification. It was further confirmed that polyphosphate accumulating organisms (PAOs) were dominant in microbial communities revealed by fluorescence in situ hybridization and 16S rRNA amplicon sequencing. Moreover, denitrifying phosphorus removal by PAOs through nitrite pathway was found to be the main reason for the high efficiency of this SNDPR process. Denitrifying PAOs, especially the subgroup PAOII capable of utilizing nitrite to take up phosphorus, played a significant role in highly efficient TN and TP removal at low temperature. Furthermore, genus Propionivibrio was enriched (48.9%) in the bacterial community based on the 16S rRNA analysis, which was proposed to be a crucial member involved in the nitrogen and phosphorus removal simultaneously at low temperature in this system.
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Affiliation(s)
- Can Li
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Shufeng Liu
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Tao Ma
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China
| | - Maosheng Zheng
- Key Laboratory of Regional Energy Systems Optimization, North China Electric Power University, Beijing, 102206, China.
| | - Jinren Ni
- Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing, 100871, China.
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18
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Zhang M, Gu J, Liu Y. Engineering feasibility, economic viability and environmental sustainability of energy recovery from nitrous oxide in biological wastewater treatment plant. BIORESOURCE TECHNOLOGY 2019; 282:514-519. [PMID: 30878291 DOI: 10.1016/j.biortech.2019.03.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2019] [Revised: 03/06/2019] [Accepted: 03/07/2019] [Indexed: 06/09/2023]
Abstract
Currently, the biological wastewater treatment has been challenged by their high energy consumption. An increasing effort has been devoted to exploring energy recovery from nitrous oxide (N2O) as a powerful fuel additive rather than as an unwanted byproduct during biological nitrogen removal. This review aims to offer a holistic and critical analysis of the ideas for N2O production and energy recovery in terms of engineering feasibility, economic viability and environmental sustainability. It turns out that the recoverable energy from N2O produced in municipal wastewater is below 0.03 kWh/m3, which is insignificant compared with the in-plant energy consumption, while complicated process configuration and high cost associated with harvesting and post-purification of N2O will be incurred. An environmental risk related to global climate change due to the emission of residual dissolved N2O is also concerned. Further effort on N2O production and recovery technologies is indeed required to improve the overall energy balance.
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Affiliation(s)
- Meng Zhang
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Jun Gu
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore
| | - Yu Liu
- Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore 637141, Singapore; School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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19
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Wang H, Sun Y, Wu G, Guan Y. Effect of anoxic to aerobic duration ratios on nitrogen removal and nitrous oxide emission in the multiple anoxic/aerobic process. ENVIRONMENTAL TECHNOLOGY 2019; 40:1676-1685. [PMID: 29333979 DOI: 10.1080/09593330.2018.1427801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Accepted: 01/09/2018] [Indexed: 06/07/2023]
Abstract
Characteristics of nitrogen removal and nitrous oxide (N2O) emission in the multiple anoxic/aerobic (AO) process were examined in three sequencing batch reactors (SBRs) with different anoxic durations (50 min, SBRH; 40 min, SBRM; 30 min, SBRL) and a fixed aerobic duration of 30 min. The highest total inorganic nitrogen removal percentage of 85.8% was obtained in SBRH, while a minimum N2O emission factor of 1.9% was obtained in SBRL. During nitrification batch experiments, the N2O emission factor and emission rate were both lower in SBRH than SBRL. More N2O production was obtained during denitrification in SBRH when denitrifiers utilized intracellular organic carbon. Nitrite reduction by heterotrophs was the main N2O production pathway during simultaneous nitrification and denitrification in SBRH and SBRL, with the N2O emission factor of 31.3% and 36.3%, respectively. Adequate anoxic duration and lowering aerobic nitrite concentrations could be adopted to mitigate N2O emission in the multiple AO process. The dominant microorganisms at the phylum level in all reactors were Proteobacteria and Bacteroidetes, while the abundance of Nitrospira was the highest in SBRH with relatively lowest dissolved oxygen concentrations.
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Affiliation(s)
- Huoqing Wang
- a Guangdong Province Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
| | - Yuepeng Sun
- a Guangdong Province Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
| | - Guangxue Wu
- a Guangdong Province Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
| | - Yuntao Guan
- a Guangdong Province Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
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20
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Chua FJD, Sun F, Mukherjee M, Zhou Y. Comparison of nitrous oxide emission between a partial and full nitrification enriched ammonia-oxidising culture. CHEMOSPHERE 2019; 220:974-982. [PMID: 33395819 DOI: 10.1016/j.chemosphere.2018.12.204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 12/04/2018] [Accepted: 12/30/2018] [Indexed: 06/12/2023]
Abstract
Nitrification systems are known to be a source of nitrous oxide (N2O) emission, however, the contribution from partial and full nitrification systems remains controversial. In this study, N2O emission from a partial and full nitrification culture was investigated. In all tests, nitrite, dissolved oxygen concentration and pH levels were controlled within a similar range limiting ammonium concentration to be the only variable. The results reveal with the same amount of ammonium removed, the full nitrification culture produced far greater N2O than the partial nitrification culture for both pulse (25-36 times) and continuous feeding modes (2-110 times). The relative gene expression data indicate that under pulse feeding there is a decreasing trend of nirK and norB genes for the partial and full nitrification culture respectively while under continuous feeding, increasing norB trends were observed for both. This possibly indicated the hydroxylamine pathway was favoured for the partial nitrification culture while the hybrid N-nitrosation pathway maybe the major contributor for the full nitrification culture. These findings improve our understanding on N2O production pathways and enable researchers to propose better mitigation strategies.
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Affiliation(s)
- Feng Jun Desmond Chua
- School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 637141, Singapore
| | - Faqian Sun
- School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 637141, Singapore
| | - Manisha Mukherjee
- School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore; Singapore Centre for Environmental Life Sciences and Engineering, Nanyang Technological University, 637551, Singapore
| | - Yan Zhou
- School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 637141, Singapore.
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21
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Vasilaki V, Volcke EIP, Nandi AK, van Loosdrecht MCM, Katsou E. Relating N 2O emissions during biological nitrogen removal with operating conditions using multivariate statistical techniques. WATER RESEARCH 2018; 140:387-402. [PMID: 29754044 DOI: 10.1016/j.watres.2018.04.052] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 04/07/2018] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
Multivariate statistical analysis was applied to investigate the dependencies and underlying patterns between N2O emissions and online operational variables (dissolved oxygen and nitrogen component concentrations, temperature and influent flow-rate) during biological nitrogen removal from wastewater. The system under study was a full-scale reactor, for which hourly sensor data were available. The 15-month long monitoring campaign was divided into 10 sub-periods based on the profile of N2O emissions, using Binary Segmentation. The dependencies between operating variables and N2O emissions fluctuated according to Spearman's rank correlation. The correlation between N2O emissions and nitrite concentrations ranged between 0.51 and 0.78. Correlation >0.7 between N2O emissions and nitrate concentrations was observed at sub-periods with average temperature lower than 12 °C. Hierarchical k-means clustering and principal component analysis linked N2O emission peaks with precipitation events and ammonium concentrations higher than 2 mg/L, especially in sub-periods characterized by low N2O fluxes. Additionally, the highest ranges of measured N2O fluxes belonged to clusters corresponding with NO3-N concentration less than 1 mg/L in the upstream plug-flow reactor (middle of oxic zone), indicating slow nitrification rates. The results showed that the range of N2O emissions partially depends on the prior behavior of the system. The principal component analysis validated the findings from the clustering analysis and showed that ammonium, nitrate, nitrite and temperature explained a considerable percentage of the variance in the system for the majority of the sub-periods. The applied statistical methods, linked the different ranges of emissions with the system variables, provided insights on the effect of operating conditions on N2O emissions in each sub-period and can be integrated into N2O emissions data processing at wastewater treatment plants.
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Affiliation(s)
- V Vasilaki
- Department of Civil & Environmental Engineering, Brunel University London, Uxbridge UB8 3PH, UK
| | - E I P Volcke
- Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Gent, Belgium
| | - A K Nandi
- Department of Electronic and Computer Engineering, Brunel University London, Uxbridge UB8 3PH, UK
| | - M C M van Loosdrecht
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
| | - E Katsou
- Department of Civil & Environmental Engineering, Brunel University London, Uxbridge UB8 3PH, UK.
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22
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A state-of-the-art review on nitrous oxide control from waste treatment and industrial sources. Biotechnol Adv 2018; 36:1025-1037. [DOI: 10.1016/j.biotechadv.2018.03.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 03/02/2018] [Accepted: 03/10/2018] [Indexed: 02/01/2023]
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23
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Sun Y, Wang H, Wu G, Guan Y. Nitrogen removal and nitrous oxide emission from a step-feeding multiple anoxic and aerobic process. ENVIRONMENTAL TECHNOLOGY 2018; 39:814-823. [PMID: 28345390 DOI: 10.1080/09593330.2017.1311947] [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: 11/26/2016] [Accepted: 03/22/2017] [Indexed: 06/06/2023]
Abstract
The multiple anoxic and aerobic (AO) process is an advanced biological nitrogen-removal process, and nitrous oxide (N2O) emission might affect its sustainable application. Nitrogen removal and N2O emission in a step-feeding multiple AO sequencing batch reactor (SBRS) was examined, in comparison with a one-feeding sequencing batch reactor (SBRO). Nitrogen removal was enhanced by 12.6% in SBRS compared to the removal percentage of 75.8% in SBRO. Activated sludge in SBRs possessed a higher N2O emission factor during nitrification, denitrification and simultaneous nitrification and denitrification (SND) than in SBRO. A high N2O emission factor was observed during SND in both reactors, with the emission factor of 4.38% in SBRS and 4.66% in SBRO. More N2O emission occurred in the presence of nitrite. Bacteroidetes and Proteobacteria dominated in both SBRS and SBRO. A similar abundance of Thauera, Dechloromonas and Zoogloea possible for denitrification was observed in SBRS and SBRO. Moreover, nosZ from Proteobacteria dominated in both SBRS and SBRO, with dominating genus of Acidovorax, Ralstonia, Thauera and Marinobacter.
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Affiliation(s)
- Yuepeng Sun
- a Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
| | - Huoqing Wang
- a Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
| | - Guangxue Wu
- a Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
| | - Yuntao Guan
- a Key Laboratory of Microorganism Application and Risk Control (MARC) of Shenzhen, Graduate School at Shenzhen , Tsinghua University , Shenzhen , People's Republic of China
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Xu D, Liu S, Chen Q, Ni J. Microbial community compositions in different functional zones of Carrousel oxidation ditch system for domestic wastewater treatment. AMB Express 2017; 7:40. [PMID: 28205101 PMCID: PMC5311017 DOI: 10.1186/s13568-017-0336-y] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 01/31/2017] [Indexed: 11/10/2022] Open
Abstract
The microbial community diversity in anaerobic-, anoxic- and oxic-biological zones of a conventional Carrousel oxidation ditch system for domestic wastewater treatment was systematically investigated. The monitored results of the activated sludge sampled from six full-scale WWTPs indicated that Proteobacteria, Chloroflexi, Bacteroidetes, Actinobacteria, Verrucomicrobia, Acidobacteria and Nitrospirae were dominant phyla, and Nitrospira was the most abundant and ubiquitous genus across the three biological zones. The anaerobic-, anoxic- and oxic-zones shared approximately similar percentages across the 50 most abundant genera, and three genera (i.e. uncultured bacterium PeM15, Methanosaeta and Bellilinea) presented statistically significantly differential abundance in the anoxic-zone. Illumina high-throughput sequences related to ammonium oxidizer organisms and denitrifiers with top50 abundance in all samples were Nitrospira, uncultured Nitrosomonadaceae, Dechloromonas, Thauera, Denitratisoma, Rhodocyclaceae (norank) and Comamonadaceae (norank). Moreover, environmental variables such as water temperature, water volume, influent ammonium nitrogen, influent chemical oxygen demand (COD) and effluent COD exhibited significant correlation to the microbial community according to the Monte Carlo permutation test analysis (p < 0.05). The abundance of Nitrospira, uncultured Nitrosomonadaceae and Denitratisoma presented strong positive correlations with the influent/effluent concentration of COD and ammonium nitrogen, while Dechloromonas, Thauera, Rhodocyclaceae (norank) and Comamonadaceae (norank) showed positive correlations with water volume and temperature. The established relationship between microbial community and environmental variables in different biologically functional zones of the six representative WWTPs at different geographical locations made the present work of potential use for evaluation of practical wastewater treatment processes.
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25
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An Y, Zhou Z, Yao J, Niu T, Qiu Z, Ruan D, Wei H. Sludge reduction and microbial community structure in an anaerobic/anoxic/oxic process coupled with potassium ferrate disintegration. BIORESOURCE TECHNOLOGY 2017; 245:954-961. [PMID: 28946196 DOI: 10.1016/j.biortech.2017.09.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 09/02/2017] [Accepted: 09/04/2017] [Indexed: 06/07/2023]
Abstract
An anaerobic/anoxic/oxic (AAO) wastewater treatment system combining with a potassium ferrate (K2FeO4) oxidation side-stream reactor (SSR) was proposed for sludge reduction. Batch experiments showed that optimal K2FeO4 dosage and reaction time for sludge disintegration was 100mg/g suspended solids (SS) and 24h, respectively. Subsequently, an AAO-SSR and a conventional AAO were operated in parallel to investigate effects of K2FeO4 oxidation on process performance, sludge characteristics and microbial community structures. The AAO-SSR process operated under the optimized condition achieved efficient COD and NH4+-N removal, and reduced sludge by 47.5% with observed yield coefficient of 0.21gSS/g COD. K2FeO4 addition broke sludge particles, increased dissolved organic matters in the mixed liquor, and improved sludge dewaterability. Illumina-MiSeq sequencing results showed that K2FeO4 oxidation in the AAO-SSR decreased microbial richness and diversity, enriched slow growers (Dechloromonas), anaerobic fermentative bacteria (Azospira) and Fe(III)-reducing bacteria (Ferribacterium), but limited the growth of phosphate-accumulating organisms.
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Affiliation(s)
- Ying An
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhen Zhou
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
| | - Jie Yao
- Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
| | - Tianhao Niu
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Zhan Qiu
- Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
| | - Danian Ruan
- College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
| | - Haijuan Wei
- Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China
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26
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Sun S, Bao Z, Li R, Sun D, Geng H, Huang X, Lin J, Zhang P, Ma R, Fang L, Zhang X, Zhao X. Reduction and prediction of N 2O emission from an Anoxic/Oxic wastewater treatment plant upon DO control and model simulation. BIORESOURCE TECHNOLOGY 2017; 244:800-809. [PMID: 28830043 DOI: 10.1016/j.biortech.2017.08.054] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 08/08/2017] [Accepted: 08/09/2017] [Indexed: 06/07/2023]
Abstract
In order to make a better understanding of the characteristics of N2O emission in A/O wastewater treatment plant, full-scale and pilot-scale experiments were carried out and a back propagation artificial neural network model based on the experimental data was constructed to make a precise prediction of N2O emission. Results showed that, N2O flux from different units followed a descending order: aerated grit tank>oxic zone≫anoxic zone>final clarifier>primary clarifier, but 99.4% of the total emission of N2O (1.60% of N-load) was monitored from the oxic zone due to its big surface area. A proper DO control could reduce N2O emission down to 0.21% of N-load in A/O process, and a two-hidden-layers back propagation model with an optimized structure of 4:3:9:1 could achieve a good simulation of N2O emission, which provided a new method for the prediction of N2O emission during wastewater treatment.
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Affiliation(s)
- Shichang Sun
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China; College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Zhiyuan Bao
- Beijing Key Lab. for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing, China
| | - Ruoyu Li
- Beijing Key Lab. for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing, China
| | - Dezhi Sun
- Beijing Key Lab. for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing, China
| | - Haihong Geng
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Xiaofei Huang
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Junhao Lin
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Peixin Zhang
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Rui Ma
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Lin Fang
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China
| | - Xianghua Zhang
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China; Laboratory of Glasses and Ceramics, Institute of Chemical Science, University of Rennes 1, Rennes 35042, France
| | - Xuxin Zhao
- College of Chemistry and Enviromental Engineering, Shenzhen University, Shenzhen 518060, China
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Massara TM, Malamis S, Guisasola A, Baeza JA, Noutsopoulos C, Katsou E. A review on nitrous oxide (N 2O) emissions during biological nutrient removal from municipal wastewater and sludge reject water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 596-597:106-123. [PMID: 28426987 DOI: 10.1016/j.scitotenv.2017.03.191] [Citation(s) in RCA: 153] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Revised: 03/19/2017] [Accepted: 03/19/2017] [Indexed: 05/20/2023]
Abstract
Nitrous oxide (N2O) is an important pollutant which is emitted during the biological nutrient removal (BNR) processes of wastewater treatment. Since it has a greenhouse effect which is 265 times higher than carbon dioxide, even relatively small amounts can result in a significant carbon footprint. Biological nitrogen (N) removal conventionally occurs with nitrification/denitrification, yet also through advanced processes such as nitritation/denitritation and completely autotrophic N-removal. The microbial pathways leading to the N2O emission include hydroxylamine oxidation and nitrifier denitrification, both activated by ammonia oxidizing bacteria, and heterotrophic denitrification. In this work, a critical review of the existing literature on N2O emissions during BNR is presented focusing on the most contributing parameters. Various factors increasing the N2O emissions either per se or combined are identified: low dissolved oxygen, high nitrite accumulation, low chemical oxygen demand to nitrogen ratio, slow growth of denitrifying bacteria, uncontrolled pH and temperature. However, there is no common pattern in reporting the N2O generation amongst the cited studies, a fact that complicates its evaluation. When simulating N2O emissions, all microbial pathways along with the potential contribution of abiotic N2O production during wastewater treatment at different dissolved oxygen/nitrite levels should be considered. The undeniable validation of the robustness of such models calls for reliable quantification techniques which simultaneously describe dissolved and gaseous N2O dynamics. Thus, the choice of the N-removal process, the optimal selection of operational parameters and the establishment of validated dynamic models combining multiple N2O pathways are essential for studying the emissions mitigation.
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Affiliation(s)
- Theoni Maria Massara
- Department of Mechanical, Aerospace and Civil Engineering, Brunel University London, Uxbridge Campus, Middlesex, UB8 3PH, Uxbridge, UK; Institute of Environment, Health and Societies, Brunel University London, Kingston Lane, Middlesex, UB8 3PH, Uxbridge, UK
| | - Simos Malamis
- Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780 Athens, Greece
| | - Albert Guisasola
- GENOCOV, Departament d'Enginyeria Química, Biològica i Ambiental, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallés (Barcelona), 08193 Barcelona, Spain
| | - Juan Antonio Baeza
- GENOCOV, Departament d'Enginyeria Química, Biològica i Ambiental, Escola d'Enginyeria, Universitat Autònoma de Barcelona, Cerdanyola del Vallés (Barcelona), 08193 Barcelona, Spain
| | - Constantinos Noutsopoulos
- Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, 15780 Athens, Greece
| | - Evina Katsou
- Department of Mechanical, Aerospace and Civil Engineering, Brunel University London, Uxbridge Campus, Middlesex, UB8 3PH, Uxbridge, UK; Institute of Environment, Health and Societies, Brunel University London, Kingston Lane, Middlesex, UB8 3PH, Uxbridge, UK.
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28
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Zheng M, Fu HZ, Ho YS. Research trends and hotspots related to ammonia oxidation based on bibliometric analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:20409-20421. [PMID: 28707243 DOI: 10.1007/s11356-017-9711-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 07/04/2017] [Indexed: 06/07/2023]
Abstract
Ammonia oxidation is the rate-limiting and central step in global biogeochemistry cycle of nitrogen. A bibliometric analysis based on 4314 articles extracted from Science Citation Index Expanded database was carried out to provide insights into publication performances and research trends of ammonia oxidation in the period 1991-2014. These articles were originated from a wide range of 602 journals and 95 Web of Science Categories, among which Applied and Environmental Microbiology and Environmental Sciences took the leading position, respectively. Furthermore, co-citation analysis conducted with help of CiteSpace software clearly illustrated that ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), and anaerobic ammonia oxidation (anammox) were three dominant research themes. A total of 15 landmark works identified with the highest co-citation frequencies at every 8 years were extracted, which demonstrated that the establishments of culture-independent molecular biotechnologies as well as the discoveries of anammox and AOA played the most significant roles in promoting the evolution and development of ammonia oxidation research. Finally, word cluster analysis further suggested that microbial abundance and community of AOA and AOB was the most prominent hotspot, with soil and high-throughput sequencing as the most promising ecosystem and molecular biotechnology. In addition, application of anammox in nitrogen removal from wastewater has become another attractive research hotspot. This study provides a basis for better understanding the situations and prospective directions of the research field of ammonia oxidation.
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Affiliation(s)
- Maosheng Zheng
- MOE Key Laboratory of Regional Energy Systems Optimization, Sino-Canada Resources and Environmental Research Academy, North China Electric Power University, Beijing, 102206, People's Republic of China
| | - Hui-Zhen Fu
- Department of Information Resources Management, School of Public Affairs, Zhejiang University, Hangzhou, 310058, People's Republic of China
| | - Yuh-Shan Ho
- Trend Research Centre, Asia University, Taichung, 41354, Taiwan.
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29
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Cao Q, Wang H, Chen X, Wang R, Liu J. Composition and distribution of microbial communities in natural river wetlands and corresponding constructed wetlands. ECOLOGICAL ENGINEERING 2017; 98:40-48. [DOI: 10.1016/j.ecoleng.2016.10.063] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
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30
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Liang W, Yu C, Ren H, Geng J, Ding L, Xu K. Minimization of nitrous oxide emission from CASS process treating low carbon source domestic wastewater: Effect of feeding strategy and aeration rate. BIORESOURCE TECHNOLOGY 2015; 198:172-180. [PMID: 26386420 DOI: 10.1016/j.biortech.2015.08.075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 08/10/2015] [Accepted: 08/11/2015] [Indexed: 06/05/2023]
Abstract
Nitrous oxide (N2O) emission during wastewater treatment can be mitigated by improving operational conditions, e.g., organic carbon supply and dissolved oxygen. To evaluate the control parameters for N2O emission in the low carbon source domestic wastewater treatment process, N2O emissions from Cyclic Activated Sludge System (CASS) under different feeding strategies and aeration rates were investigated. Results showed that continuous feeding enhanced nitrogen removal and reduced N2O emission compared to batch feeding, while a higher aeration rate led to less N2O emission. N2O was mainly produced during non-aeration phases in batch feeding CASS and the amount of N2O generated from denitrification decreased under continuous feeding, indicating that carbon source in the continuous influent relieved the electron competition between denitrification reductases during non-aeration phase. Moreover, taxonomic analysis based on high-throughput 16S rRNA gene sequencing revealed higher abundance of denitrifying bacteria, especially N2O-reducing bacteria in continuous feeding CASS.
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Affiliation(s)
- Weihao Liang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Chao Yu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Jinju Geng
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Lili Ding
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China
| | - Ke Xu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
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31
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Zhu S, Zheng M, Li C, Gui M, Chen Q, Ni J. Special role of corn flour as an ideal carbon source for aerobic denitrification with minimized nitrous oxide emission. BIORESOURCE TECHNOLOGY 2015; 186:44-51. [PMID: 25802047 DOI: 10.1016/j.biortech.2015.03.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 03/03/2015] [Accepted: 03/07/2015] [Indexed: 06/04/2023]
Abstract
Much effort has been made for reducing nitrous oxide (N2O) emission in wastewater treatment processes. This paper presents an interesting way to minimize N2O in aerobic denitrification by strain Pseudomonas stutzeri PCN-1 with help of corn flour as cheaper additional carbon source. Experimental results showed that maximal N2O accumulation by strain PCN-1 was only 0.02% of removed nitrogen if corn flour was used as sole carbon source, which was significantly reduced by 52.07-99.81% comparing with others such as succinate, glucose, acetate and citrate. Sustained release of reducing sugar from starch and continuous expression of nosZ coding for N2O reductase contributed to the special role of corn flour as the ideal carbon source for strain PCN-1. Further experiments in sequencing batch reactors (SBRs) demonstrated similarly efficient nitrogen removal with much less N2O emission due to synergy of the novel strain and activated sludge, which was then confirmed by quantitative PCR analysis.
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Affiliation(s)
- Shuangyue Zhu
- Shenzhen Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Maosheng Zheng
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Can Li
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Mengyao Gui
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Qian Chen
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Jinren Ni
- Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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