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Hou X, Song X, Liu Y, Zhao X, Meng X. Treatment of eutrophic water in pyrite-filled constructed wetland integrated with microelectrolysis driven by iron/sulfur cycle: Performance and mechanism. BIORESOURCE TECHNOLOGY 2024; 407:131115. [PMID: 39013480 DOI: 10.1016/j.biortech.2024.131115] [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: 05/01/2024] [Revised: 07/01/2024] [Accepted: 07/13/2024] [Indexed: 07/18/2024]
Abstract
This study developed a microelectrolysis-integrated constructed wetland with pyrite filler around the cathode (e-PCW) to treat eutrophic water. Results indicated that e-PCW effectively enhanced pyrite dissolution, converting solid-phase electron donors into bioavailable forms, thereby facilitating the enrichment of various denitrifying bacteria on pyrite surfaces. Importantly, iron-reducing and sulfur-reducing bacteria attached to the pyrite surfaces enhanced the conversion of ferric iron and sulfate, thereby driving iron and sulfur cycles and promoting electron transfer. Therefore, synergistic effects of pyrite and microelectrolysis made e-PCW achieve higher total nitrogen (TN) and total phosphorus (TP) removal efficiencies. With a hydraulic retention time of 24 h, the highest removal efficiencies of TN and TP achieved 78% and 75%, respectively. Furthermore, when eutrophic water containing high concentration of algae was fed into e-PCW, it consistently demonstrated superior TN and TP removal capabilities. This work provides a valuable approach to optimizing constructed wetland technology for treating eutrophic water.
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Affiliation(s)
- Xiaoxiao Hou
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
| | - Xinshan Song
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
| | - Yingying Liu
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
| | - Xiaoxiang Zhao
- College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
| | - Xiangzhou Meng
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
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2
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Li X, Ren B, Kou X, Hou Y, Buque AL, Gao F. Recent advances and prospects of constructed wetlands in cold climates: a review from 2013 to 2023. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:44691-44716. [PMID: 38965108 DOI: 10.1007/s11356-024-34065-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 06/18/2024] [Indexed: 07/06/2024]
Abstract
Constructed wetland (CW), a promising, environmentally responsible, and effective green ecological treatment technology, is actively involved in the treatment of various forms of wastewater. Low temperatures will, however, lead to issues including plant dormancy, decreased microbial activity, and ice formation in CWs, which will influence how well CWs process wastewater. Applying CWs successfully and continuously in cold areas is extremely difficult. Therefore, it is crucial to find solutions for the pressing issue of increasing the CWs' ability to process wastewater at low temperatures. This review focuses on the effect of cold climate on CWs (plants, substrates, microorganisms, removal effect of pollutants). It meticulously outlines current strategies to enhance CWs' performance under low-temperature conditions, including modifications for the improvement and optimization of the internal components (i.e., plant and substrate selection, bio-augmentation) and enhancement of the external operation conditions of CWs (such as process combination, effluent recirculation, aeration, heat preservation, and operation parameter optimization). Finally, future perspectives on potential research directions and technological innovations that could strengthen CWs' performance in cold climates are prospected. This review aims to contribute valuable insights into the operation strategies, widespread implementation, and subsequent study of CWs in colder climate regions.
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Affiliation(s)
- Xiaofeng Li
- School of Water and Environment, Chang'an University, Xi'an, 710054, People's Republic of China
- Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang'an University, Xi'an, 710054, People's Republic of China
- Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of Ministry of Water Resources, Chang'an University, Xi'an, 710054, People's Republic of China
| | - Baiming Ren
- School of Water and Environment, Chang'an University, Xi'an, 710054, People's Republic of China.
- Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang'an University, Xi'an, 710054, People's Republic of China.
- Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of Ministry of Water Resources, Chang'an University, Xi'an, 710054, People's Republic of China.
| | - Xiaomei Kou
- Shaanxi Union Research Center of University and Enterprise for River and Lake Ecosystems Protection and Restoration, Xi'an, 710065, People's Republic of China
- Power China Northwest Engineering Corporation Limited, Xi'an, 710065, People's Republic of China
| | - Yunjie Hou
- School of Water and Environment, Chang'an University, Xi'an, 710054, People's Republic of China
- Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang'an University, Xi'an, 710054, People's Republic of China
- Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of Ministry of Water Resources, Chang'an University, Xi'an, 710054, People's Republic of China
| | - Arsenia Luana Buque
- School of Water and Environment, Chang'an University, Xi'an, 710054, People's Republic of China
- Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of the Ministry of Education, Chang'an University, Xi'an, 710054, People's Republic of China
- Key Laboratory of Eco-Hydrology and Water Security in Arid and Semi-Arid Regions of Ministry of Water Resources, Chang'an University, Xi'an, 710054, People's Republic of China
| | - Fan Gao
- Shaanxi Union Research Center of University and Enterprise for River and Lake Ecosystems Protection and Restoration, Xi'an, 710065, People's Republic of China
- Power China Northwest Engineering Corporation Limited, Xi'an, 710065, People's Republic of China
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3
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Wu Q, Chen Y, He Y, Cheng Q, Wu Q, Liu Z, Li Y, Yang Z, Tan Y, Yuan Y. Enhanced nitrogen and phosphorus removal by a novel ecological floating bed integrated with three-dimensional biofilm electrode system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 348:119346. [PMID: 37866187 DOI: 10.1016/j.jenvman.2023.119346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 09/23/2023] [Accepted: 10/14/2023] [Indexed: 10/24/2023]
Abstract
The ecological floating bed (EFB) has been used extensively for the purification of eutrophication water. However, the traditional EFB (T-EFB) often exhibits a decline in nitrogen and phosphorus removal because of the limited adsorption capacity of fillers and inadequate electron donors. In the present study, a series of electrolysis-ecological floating beds (EC-EFBs) were constructed to investigate the decontamination performance of conventional pollutants. EC-EFB outperformed T-EFB in terms of nitrogen and phosphorus removal. Its removal efficiency of total nitrogen and total phosphorus was 20.51-32.95% and 45.06-96.20%, which were higher than that in T-EFB.. Moreover, the plants in EC-EFB demonstrated higher metabolic activity than those in T-EFB. Under the electrolysis condition of 0.51 mA/cm2 for 24 h, the malondialdehyde content and superoxide dismutase activity in EC-EFB were 6.08 nmol/g and 22.61 U/g, which were significantly lower compared to T-EFB (38.65 nmol/g and 26.13 U/g). And the soluble protein content of plant leaves increased from 3.31 mg/g to 5.72 mg/g in EC-EFB. Microbial analysis revealed that electrolysis could significantly change the microbial community and facilitate the proliferation of nitrogen-functional microbes, such as Thermomonas, Hydrogenophaga, Deinococcus, and Zoogloea. It is important to highlight that the hydrogen evolution reaction at the cathode area facilitated phosphorus removal in EC-EFB, thereby inhibiting phosphorus leaching. This study provides a promising and innovative technology for the purification of eutrophic water.
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Affiliation(s)
- Qingyu Wu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Yao Chen
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing, 400074, China.
| | - Yang He
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Qiming Cheng
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Qiong Wu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Zhen Liu
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China; Engineering Laboratory of Environmental Hydraulic Engineering of Chongqing Municipal Development and Reform Commission, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Yunqing Li
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Zhenmei Yang
- Jiangjin Ecological Environment Monitoring Station, Chongqing, 402260, China
| | - Yuqing Tan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
| | - Ying Yuan
- School of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing, 400074, China
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4
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Jin C, Tang Q, Xu H, Sheng Y. Effects of anode materials on nitrate reduction and microbial community in a three-dimensional electrode biofilm reactor with sulfate. CHEMOSPHERE 2023; 340:139909. [PMID: 37611758 DOI: 10.1016/j.chemosphere.2023.139909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2023] [Revised: 06/22/2023] [Accepted: 08/19/2023] [Indexed: 08/25/2023]
Abstract
Graphite rod corrosion and peeling are serious problems in three-dimensional electrode biofilm reactors (3D-BERs). In this study, titanium rods, titanium suboxide-coated titanium rods and graphite rods were used as anodes to investigate the effect of anodic materials on the electrochemical and bioelectrochemical reduction of nitrate and sulfate. The results showed that the reactor with the titanium suboxide-coated titanium rod anode (3D-ER-T) exhibited a stable NO3--N removal efficiency (46%-95%) with a current range of 160-320 mA in the electrochemical reduction process. In the bioelectrochemical reduction, the removal efficiencies of NO3--N and SO42- and nitrogen selectivity in the 3D-BER with titanium suboxide-coated titanium rod anode (3D-BER-T) were higher than those in the 3D-BER with titanium suboxide-coated graphite rod anode (3D-BER-G). The removal efficiencies of NO3--N and SO42- and nitrogen selectivity were 92%, 43% and 86%, respectively, in 3D-BER-T under 320 mA and HRT 12 h. Anode materials affected the microbial community. Hydrogenophaga and Dethiobacter were the dominant bacteria in 3D-BER-T, while OPB41 and Sulfurospirillum were dominant in 3D-BER-G. Nitrate and sulfate were effectively removed in 3D-BER-T by the synergistic work of electrochemical reduction, bioelectrochemical reduction and indirect electrochemical reduction. The resupply/reserve mode of the electron donor promoted the load of shock resistance of 3D-BER-T via the sulfur cycle. Titanium suboxide coating could significantly enhance the anti-corrosion ability of matrix anodes.
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Affiliation(s)
- Chunhong Jin
- CAS Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Qi Tang
- CAS Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hengduo Xu
- CAS Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
| | - Yanqing Sheng
- CAS Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.
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5
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Guo Y, Gu S, Wu K, Tanentzap AJ, Yu J, Liu X, Li Q, He P, Qiu D, Deng Y, Wang P, Wu Z, Zhou Q. Temperature-mediated microbial carbon utilization in China's lakes. GLOBAL CHANGE BIOLOGY 2023; 29:5044-5061. [PMID: 37427534 DOI: 10.1111/gcb.16840] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 06/05/2023] [Indexed: 07/11/2023]
Abstract
Microbes play an important role in aquatic carbon cycling but we have a limited understanding of their functional responses to changes in temperature across large geographic areas. Here, we explored how microbial communities utilized different carbon substrates and the underlying ecological mechanisms along a space-for-time substitution temperature gradient of future climate change. The gradient included 47 lakes from five major lake regions in China spanning a difference of nearly 15°C in mean annual temperatures (MAT). Our results indicated that lakes from warmer regions generally had lower values of variables related to carbon concentrations and greater carbon utilization than those from colder regions. The greater utilization of carbon substrates under higher temperatures could be attributed to changes in bacterial community composition, with a greater abundance of Cyanobacteria and Actinobacteriota and less Proteobacteria in warmer lake regions. We also found that the core species in microbial networks changed with increasing temperature, from Hydrogenophaga and Rhodobacteraceae, which inhibited the utilization of amino acids and carbohydrates, to the CL500-29-marine-group, which promoted the utilization of all almost carbon substrates. Overall, our findings suggest that temperature can mediate aquatic carbon utilization by changing the interactions between bacteria and individual carbon substrates, and the discovery of core species that affect carbon utilization provides insight into potential carbon sequestration within inland water bodies under future climate warming.
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Affiliation(s)
- Yao Guo
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
- University of Chinese Academy of Sciences, Beijing, the People's Republic of China
| | - Songsong Gu
- University of Chinese Academy of Sciences, Beijing, the People's Republic of China
- Key Laboratory for Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (CAS), Beijing, the People's Republic of China
| | - Kaixuan Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
- University of Chinese Academy of Sciences, Beijing, the People's Republic of China
| | - Andrew J Tanentzap
- Ecosystems and Global Change Group, School of the Environment, Trent University, Peterborough, Ontario, Canada
- Ecosystems and Global Change Group, Department of Plant Sciences, University of Cambridge, Cambridge, UK
| | - Junqi Yu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
| | - Xiangfen Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
- University of Chinese Academy of Sciences, Beijing, the People's Republic of China
| | - Qianzheng Li
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
- University of Chinese Academy of Sciences, Beijing, the People's Republic of China
| | - Peng He
- School of Environmental Studies, China University of Geosciences, Wuhan, the People's Republic of China
| | - Dongru Qiu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
| | - Ye Deng
- Key Laboratory for Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (CAS), Beijing, the People's Republic of China
| | - Pei Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
| | - Zhenbin Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
- School of Environmental Studies, China University of Geosciences, Wuhan, the People's Republic of China
| | - Qiaohong Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, the People's Republic of China
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Feng Y, Nuerla A, Tian M, Mamat A, Si A, Chang J, Abudureheman M, He C, Zhu J, Tong Z, Liu Z. Removal of chloramphenicol and resistance gene changes in electric-integrated vertical flow constructed wetlands. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 342:118143. [PMID: 37196621 DOI: 10.1016/j.jenvman.2023.118143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2022] [Revised: 05/02/2023] [Accepted: 05/08/2023] [Indexed: 05/19/2023]
Abstract
The performance of an electric-integrated vertical flow constructed wetland (E-VFCW) for chloramphenicol (CAP) removal, changes in microbial community structure, and the fate of antibiotic resistance genes (ARGs) were evaluated. CAP removal in the E-VFCW system was 92.73% ± 0.78% (planted) and 90.80% ± 0.61% (unplanted), both were higher than the control system which was 68.17% ± 1.27%. The contribution of anaerobic cathodic chambers in CAP removal was higher than the aerobic anodic chambers. Plant physiochemical indicators in the reactor revealed electrical stimulation increased oxidase activity. Electrical stimulation enhanced the enrichment of ARGs in the electrode layer of the E-VFCW system (except floR). Plant ARGs and intI1 levels were higher in the E-VFCW than in the control system, suggesting electrical stimulation induces plants to absorb ARGs, reducing ARGs in the wetland. The distribution of intI1 and sul1 genes in plants suggests that horizontal transfer may be the main mechanism dispersing ARGs in plants. High throughput sequencing analysis revealed electrical stimulation selectively enriched CAP degrading functional bacteria (Geobacter and Trichlorobacter). Quantitative correlation analysis between bacterial communities and ARGs confirmed the abundance of ARGs relates to the distribution of potential hosts and mobile genetic elements (intI1). E-VFCW is effective in treating antibiotic wastewater, however ARGs potentially accumulate.
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Affiliation(s)
- Yuran Feng
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Ailijiang Nuerla
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China.
| | - Menghan Tian
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Anwar Mamat
- School of Chemical Engineering and Technology, Xinjiang University, Urumqi, 830017, PR China
| | - Ang Si
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Jiali Chang
- Division of Environmental Engineering, School of Chemistry, Resources and Environment, Leshan Normal University, Sichuan, 614000, PR China
| | - Mukadasi Abudureheman
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Chaoyue He
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Jinjin Zhu
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Zhaohong Tong
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
| | - Zhaojiang Liu
- Key Laboratory of Oasis Ecology of Education Ministry, College of Ecology and Environment, Xinjiang University, Urumqi, 830017, PR China; Xinjiang Jinghe Observation and Research Station of Temperate Desert Ecosystem, Ministry of Education, Urumqi, 830017, PR China
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Zhou M, Cao J, Qiu Y, Lu Y, Guo J, Li C, Wang Y, Hao L, Ren H. Performance and mechanism of sacrificed iron anode coupled with constructed wetlands (E-Fe) for simultaneous nitrogen and phosphorus removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:51245-51260. [PMID: 36809628 DOI: 10.1007/s11356-023-25860-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 02/06/2023] [Indexed: 04/16/2023]
Abstract
Three anodic biofilm electrode coupled CWs (BECWs) with graphite (E-C), aluminum (E-Al), and iron (E-Fe), respectively, and a control system (CK) were constructed to evaluate the removal performance of N and P in the secondary effluent of wastewater treatment plants (WWTPs) under different hydraulic retention time (HRT), electrified time (ET), and current density (CD). Microbial communities, and different P speciation, were analyzed to reveal the potential removal pathways and mechanism of N and P in BECWs. Results showed that the optimal average TN and TP removal rates of CK (34.10% and 55.66%), E-C (66.77% and 71.33%), E-Al (63.46% and 84.93%), and E-Fe (74.93% and 91.22%) were obtained under the optimum conditions (HRT 10 h, ET 4 h, CD 0.13 mA/cm2), which demonstrated that the biofilm electrode could significantly improve N and P removal. Microbial community analysis showed that E-Fe owned the highest abundance of chemotrophic Fe(II) (Dechloromonas) and hydrogen autotrophic denitrifying bacteria (Hydrogenophaga). N was mainly removed by hydrogen and iron autotrophic denitrification in E-Fe. Moreover, the highest TP removal rate of E-Fe was attributed to the iron ion formed on the anode, causing co-precipitation of Fe(II) or Fe(III) with PO43--P. The Fe released from the anode acted as carriers for electron transport and accelerated the efficiency of biological and chemical reactions to enhance the simultaneous removal of N and P. Thus, BECWs provide a new perspective for the treatment of the secondary effluent from WWTPs.
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Affiliation(s)
- Ming Zhou
- Key Laboratory of Integrated Regulation and Resource Development On Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
- Henan Yongze Environmental Technology Co., Ltd, Zhengzhou, 451191, China
| | - Jiashun Cao
- Key Laboratory of Integrated Regulation and Resource Development On Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Yuanyuan Qiu
- Henan Yongze Environmental Technology Co., Ltd, Zhengzhou, 451191, China
| | - Yanhong Lu
- Henan Yongze Environmental Technology Co., Ltd, Zhengzhou, 451191, China
| | - Jinyan Guo
- Henan Yongze Environmental Technology Co., Ltd, Zhengzhou, 451191, China
| | - Chao Li
- Key Laboratory of Integrated Regulation and Resource Development On Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China.
- College of Environment, Hohai University, Nanjing, 210098, China.
| | - Yantang Wang
- Henan Yongze Environmental Technology Co., Ltd, Zhengzhou, 451191, China
| | - Liangshan Hao
- Key Laboratory of Integrated Regulation and Resource Development On Shallow Lakes, Ministry of Education, Hohai University, Nanjing, 210098, China
- College of Environment, Hohai University, Nanjing, 210098, China
| | - Hongqiang Ren
- College of Environment, Nanjing University, Nanjing, 210093, China
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8
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Tao M, Kong Y, Jing Z, Jia Q, Tao Z, Li YY. Denitrification performance, bioelectricity generation and microbial response in microbial fuel cell - constructed wetland treating carbon constraint wastewater. BIORESOURCE TECHNOLOGY 2022; 363:127902. [PMID: 36075346 DOI: 10.1016/j.biortech.2022.127902] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/30/2022] [Accepted: 08/31/2022] [Indexed: 06/15/2023]
Abstract
For the deep reduction of nitrogen, the microbial fuel cell-constructed wetland (MFC-CW) was conducted for treating carbon constraint wastewater. Results indicated that nitrogen removal decreased from 94.96% to 24.96% with influent COD/TN (chemical oxygen demand/total nitrogen) from 4 to 0. MFC-CW was seriously affected by low organic wastewater. Wetland plants contributed to denitrification, with TN removal increasing from 46.13% to 64.87%. The bioenergy output showed a linear relationship with influent COD, and the maximum power density of 1.17 mW/m2 was obtained. Correlation analysis indicated that functional genera of Paenibacillus, Trichococcus, norank_KD4-96, norank_OLB14 played a crucial role in nitrogen removal. Influent COD and wetland plants affected carbon and nitrogen metabolisms, and key genes related to denitrification were more abundant in the cathode. Findings illustrated the nitrogen metabolism in MFC-CW with carbon constraint wastewater and will extend the application of MFC-CW in secondary effluent treatment from wastewater treatment plants.
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Affiliation(s)
- Mengni Tao
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Yu Kong
- Nanjing Municipal Design and Research Institute Co., Ltd, Nanjing 210008, China
| | - Zhaoqian Jing
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
| | - Qiusheng Jia
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Zhengkai Tao
- College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan
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9
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Qin C, Yao D, Cheng C, Xie H, Hu Z, Zhang J. Influence of iron species on the simultaneous nitrate and sulfate removal in constructed wetlands under low/high COD concentrations. ENVIRONMENTAL RESEARCH 2022; 212:113453. [PMID: 35537498 DOI: 10.1016/j.envres.2022.113453] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 05/05/2022] [Accepted: 05/05/2022] [Indexed: 06/14/2023]
Abstract
Nitrate and sulfate are crucial factors of eutrophication and black and odorous water in the surface water and thus have raised increasing environmental concerns. Constructed wetlands (CWs) are the last ecological barrier before effluent enters the natural water body. To explore the simultaneous removal of nitrate and sulfate, the CW microcosms of CW-Con (with quartz sand), CW-ZVI (quartz sand and zero-valent iron), CW-Mag (quartz sand and magnetite), CW-ZVI + Mag (quartz sand, ZVI and magnetite) groups were set up under the low (100 mg/L)/high (300 mg/L) chemical oxygen demand (COD) concentration. Under the high COD condition, CW-ZVI group showed the best performance in nitrate (97.1%) and sulfate (96.9%) removal. Under the low COD concentration, the removal content of nitrate and sulfate in CW-ZVI group was better than CW-Mag group. The reason for this result was that zero-valent iron (ZVI) could be the electron donor for nitrate and sulfate reduction. Meanwhile, ZVI promoted chemical denitrification under high COD concentration according to PCA analysis. In addition, the produced sulfides inhibited the relative abundance of denitrifying bacteria, resulting in the lowest nitrate removal rate in CW-Mag group with sufficient electron donors. This study provided an alternative method to enhance simultaneous sulfate and nitrate removal in CWs.
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Affiliation(s)
- Congli Qin
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Dongdong Yao
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China
| | - Cheng Cheng
- College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
| | - Huijun Xie
- Environment Research Institute, Shandong University, Qingdao, 266237, PR China.
| | - Zhen Hu
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China
| | - Jian Zhang
- Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, PR China; College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, PR China
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Jiang S, Xu J, Wang H, Wang X. Study of the effect of pyrite and alkali-modified rice husk substrates on enhancing nitrogen and phosphorus removals in constructed wetlands. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:54234-54249. [PMID: 35298804 DOI: 10.1007/s11356-022-19537-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Accepted: 02/27/2022] [Indexed: 06/14/2023]
Abstract
The combined effects and respective advantages of using pyrite and alkali-modified rice husk (RH) were studied as substrates for nitrogen and phosphorus removal from constructed wetlands, and the effects of the carbon to nitrogen (C/N) ratio and the tidal flow mode on system performance were explored. The results showed that alkali-modified RH, which enhances heterotrophic denitrification, had far more advantages than pyrite, which enhances autotrophic denitrification, and alkali-modified RH can be used for the treatment of sewage containing low C/N ratios. At a C/N ratio of 1.5, the total nitrogen (TN) removal rates exceeded 95%. However, the removal efficiency of the system with only pyrite only reached 76.90% when the influent C/N ratio was 6. Pyrite achieved a total phosphorus (TP) removal 10-20% higher than that of the control group. The tidal flow CWs showed enhanced nitrification, and the NH4+-N removal rates increased by approximately 10%, but the increase in dissolved oxygen (DO) was still insufficient to meet the needs of the systems, leading to limited TP removal. The combination of pyrite and alkali-modified RH was optimal for improving the ability of constructed wetlands to treat wastewaters, simultaneously removing nitrogen and phosphorus from sewage containing low C/N ratios. Combined with the tidal flow mode strategy, the use of pyrite and alkali-modified RH as substrates showed substantial advantages for improving water quality.
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Affiliation(s)
- Sijia Jiang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration/School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun, 130017, China
| | - Jianling Xu
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration/School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun, 130017, China.
- Key Laboratory of Vegetation Ecology of Ministry of Education, Institute of Grassland Science, Northeast Normal University, Renmin Street 5268, Changchun, 130024 Jilin, China.
| | - Hanxi Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration/School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun, 130017, China
| | - Xinyu Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration/School of Environment, Northeast Normal University, Jingyue Street 2555, Changchun, 130017, China
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