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Guo F, Wang H, Wei X, Luo B, Song X. Baffled flow constructed wetland-microbial fuel cell coupling systems for combined secondary and tertiary wastewater treatment with simultaneous bioelectricity generation. BIORESOURCE TECHNOLOGY 2024; 412:131419. [PMID: 39233180 DOI: 10.1016/j.biortech.2024.131419] [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: 07/08/2024] [Revised: 09/01/2024] [Accepted: 09/01/2024] [Indexed: 09/06/2024]
Abstract
Baffled flow constructed wetland-microbial fuel cell (BFCW-MFC) coupling systems were constructed with baffles embedded in cathode chamber. The performance of BFCW-MFCs operated at different hydraulic retention times (HRTs) was evaluated. At the representative HRT of 48 h, embedding 1 or 2 baffles (i.e., BFCW-MFC1 and BFCW-MFC2) produced 32.9 % (29.5 mW/m3) and 53.2 % (34.0 mW/m3) more power density than control system (22.2 mW/m3), respectively. Comparable organics biodegradation efficiencies were observed in BFCW-MFCs at the same HRTs. BFCW-MFC1 and BFCW-MFC2 had higher ammonium and total nitrogen removal efficiency. All systems had decreased nitrogen removal performance as shortening HRT from 72 to 12 h. Multiple nitrogen removal processes were involved, including ammonium oxidation, anammox, and heterotrophic and autotrophic denitrification. The predominant bacteria on electrodes were identified for analyzing bioelectricity generation and wastewater treatment processes. Generally, simultaneous wastewater treatment and bioelectricity generation were obtained in BFCW-MFCs, and embedding 1 or 2 baffles was preferable.
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Affiliation(s)
- Fei Guo
- School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China.
| | - Hang Wang
- School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
| | - Xin Wei
- School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
| | - Benfu Luo
- School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
| | - Xiaoming Song
- School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
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2
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Zhao X, Pei W, Qi Y, Li Y, Kong X. Enhanced aerobic granular sludge with micro-electric field for sulfamethoxazole degradation: Efficiency, mechanism, and microbial community. CHEMOSPHERE 2024; 354:141741. [PMID: 38499071 DOI: 10.1016/j.chemosphere.2024.141741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 03/15/2024] [Accepted: 03/16/2024] [Indexed: 03/20/2024]
Abstract
In this study, an aerobic granular sludge electrochemical system (AGES) was established by applying the micro-electric field to an aerobic granular sludge (AGS) reactor for the degradation of sulfamethoxazole (SMZ). Under the stimulation of the micro-electric field, the granulation of sludge was improved and the degradation rate of SMZ was enhanced. The features of granular sludge were characterized by scanning electron microscopy and X-ray diffraction. The optimal degradation rate of SMZ (88%) was obtained at the voltage of 3 V and the effective electrode area of 800 mm2. The results of kinetics analyses revealed that the degradation of SMZ by AGES can be fitted with the second-order kinetic equation, showing a degradation rate constant (k) of 0.001 L mol-1·min-1. The degradation products of SMZ in the AGES system were detected by LC-MS and their possible degradation routes were elucidated. The micro-electric field in the AGES system played a selective role in microbes' enrichment and growth, changing the diversity of the microbial community. Pseudomonas, Tolumonas, and Acidovorax were the dominant bacteria in the AGES system, which is accountable for the abatement of SMZ and nutrients. This work provides a green means for improving AGS and paves the way for applying the AGS process to real-world wastewater treatment.
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Affiliation(s)
- Xia Zhao
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China
| | - Weina Pei
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China
| | - Yihan Qi
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China.
| | - Yabin Li
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China.
| | - Xiuqin Kong
- College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China
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Li D, Zhao Y, Wei D, Tang C, Wei T. Key issues to consider toward an efficient constructed wetland-microbial fuel cell: the idea and the reality. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:11559-11575. [PMID: 38225491 DOI: 10.1007/s11356-024-31984-0] [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: 09/06/2023] [Accepted: 01/08/2024] [Indexed: 01/17/2024]
Abstract
The research on constructed wetland (CW) and microbial fuel cell (MFC) has been separate studies worldwide with crucial achievements being made in both fields. Due to environmentally friendly feature (of CW) and rich microbial population and excellent electrode catalytic activity (of MFC), CW and MFC have their own anticipated application prospect in wastewater purification and biological electricity generation. More significantly, the idea of embedding MFC into CW to form CW-MFC expands the scope for both of them and this has received much interest in recent years due to its striking features of sewage treatment efficiency, electricity generation, sustainability, and environmental friendliness. The increasing interest and the lack of soul of CW-MFC emerging to the new researchers reflect the need to recall the idea and summarize its development with regard to achieving its reality via some key issues This forms the basis of the paper. The paper also includes how to enhance the efficiency of electricity generation and supplement energy consumption, the degradation of emerging pollutants, and the degradation mechanism as well as the potential joint application of CW-MFC with other treatment technique. A mass of CW-MFC design parameters has been synthesized from the literature. Challenges and potential directions of CW-MFC in the future are prospected. It is expected that the paper can serve as a linkage for bridging knowledge gaps for further studies of CW-MFC.
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Affiliation(s)
- Diaodiao Li
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
- Department of Municipal and Engineering, School of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
| | - Yaqian Zhao
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, People's Republic of China.
- Department of Municipal and Engineering, School of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China.
| | - Dan Wei
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
- Department of Municipal and Engineering, School of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
| | - Cheng Tang
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
- Department of Municipal and Engineering, School of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
| | - Ting Wei
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
- Department of Municipal and Engineering, School of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, Madrid, Spain
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Sorgato AC, Jeremias TC, Lobo FL, Lapolli FR. Microbial fuel cell: Interplay of energy production, wastewater treatment, toxicity assessment with hydraulic retention time. ENVIRONMENTAL RESEARCH 2023; 231:116159. [PMID: 37211179 DOI: 10.1016/j.envres.2023.116159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 05/08/2023] [Accepted: 05/14/2023] [Indexed: 05/23/2023]
Abstract
Microbial fuel cell (MFC) operation under similar conditions to conventional methods will support the use of this technology in large-scale wastewater treatment. The operation of scaled-up air-cathode MFC (2 L) fed with synthetic wastewater (similar to domestic) in a continuous flow was evaluated using three different hydraulic retention times (HRT), 12, 8, and 4 h. We found that electricity generation and wastewater treatment could be enhanced under an HRT of 12 h. Additionally, the longer HRT led to greater coulombic efficiency (5.44%) than MFC operating under 8 h and 4 h, 2.23 and 1.12%, respectively. However, due to the anaerobic condition, the MFC was unable to remove nutrients. Furthermore, an acute toxicity test with Lactuca sativa revealed that MFC could reduce wastewater toxicity. These outcomes demonstrated that scaled-up MFC could be operated as a primary effluent treatment and transform a wastewater treatment plant (WWTP) into a renewable energy producer.
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Affiliation(s)
- Ana Carla Sorgato
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina (UFSC), Campus Universitário, Trindade, 88.040-900, Florianópolis, SC, Brazil.
| | - Thamires Custódio Jeremias
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina (UFSC), Campus Universitário, Trindade, 88.040-900, Florianópolis, SC, Brazil
| | - Fernanda Leite Lobo
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará (UFC), Campus Do Pici, 60.440-900, Fortaleza, CE, Brazil
| | - Flávio Rubens Lapolli
- Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina (UFSC), Campus Universitário, Trindade, 88.040-900, Florianópolis, SC, Brazil
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Kumar S, Sangwan V, Kumar M, Deswal S. A survey on constructed wetland publications in the past three decades. ENVIRONMENTAL MONITORING AND ASSESSMENT 2023; 195:992. [PMID: 37491676 DOI: 10.1007/s10661-023-11516-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2022] [Accepted: 06/13/2023] [Indexed: 07/27/2023]
Abstract
Decentralised wastewater treatment systems, such as constructed wetlands, are becoming increasingly popular these days because they are more economical and cost-effective than conventional plants. The primary objective of this review paper is to determine the number of studies that have been conducted on constructed wetlands, specifically 'free water surface flow constructed wetlands', 'horizontal subsurface flow constructed wetlands', 'vertical subsurface flow constructed wetlands', and 'hybrid constructed wetlands'. In addition, the paper examines the status of research publications on constructed wetlands by country, author, and journal. Based on the review, it has been found that although constructed wetland technology is economical and cost-effective, it is still not among the top 10 effluent treatment methods. Compared to other constructed wetland systems, 'hybrid constructed wetlands' have received minimal attention. Based on the search results, 4639 documents published between 1989 and 2021 have been extracted from the online edition of SCI-EXPANDED, Web of Science. The documents associated with constructed wetlands are divided into eight main document types. Articles and proceedings papers are the most common document type, accounting for 93% of all publications, followed by reviews (4%), meeting abstracts (1.3%), corrections (0.56%), editorial materials (0.38%), news items (0.2%), letters (0.04%), and book reviews (0.02%).
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Affiliation(s)
- Suresh Kumar
- Department of Civil Engineering, National Institute of Technology, Kurukshetra, 136119, Haryana, India.
| | - Vikramaditya Sangwan
- Department of Civil Engineering, National Institute of Technology, Kurukshetra, 136119, Haryana, India
| | - Manoj Kumar
- Department of Hydro and Renewable Energy, Indian Institute of Technology, Roorkee, 247667, India
| | - Surinder Deswal
- Department of Civil Engineering, National Institute of Technology, Kurukshetra, 136119, Haryana, India
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Cheng Z, Xu D, Zhang Q, Tao Z, Hong R, Chen Y, Tang X, Zeng S, Wang S. Enhanced nickel removal and synchronous bioelectricity generation based on substrate types in microbial fuel cell coupled with constructed wetland: performance and microbial response. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:19725-19736. [PMID: 36239892 DOI: 10.1007/s11356-022-23458-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
In this study, an attempt was made to clarify the impact of substrates on the microbial fuel cell coupled with constructed wetland (CW-MFC) towards the treatment of nickel-containing wastewater. Herein, zeolite (ZEO), coal cinder (COA), ceramsite (CER), and granular activated carbon (GAC) were respectively introduced into lab-scaled CW-MFCs to systematically investigate the operational performances and microbial community response. GAC was deemed as the most effective substrate, and the corresponding device yielded favorable nickel removal efficiencies over 99% at different initial concentrations of nickel. GAC-CW-MFC likewise produced a maximum output voltage of 573 mV, power density of 8.95 mW/m2, and internal resistance of 177.9 Ω, respectively. The strong adsorptive capacity of nickel by GAC, accounting for 54.5% of total contaminant content, was mainly responsible for the favorable nickel removal performances of device GAC-CW-MFC. The high-valence Ni2+ was partially reduced to elemental Ni0 on the cathode, which provided evidence for the removal of heavy metals via the cathodic reduction of CW-MFC. The microbial community structure varied considerably as a result of substrates addition. For an introduction of GAC into the CW-MFC, a remarkably enriched population of genera Thermincola, norank_f__Geobacteraceae, Anaerovorax, Bacillus, etc. was noted. This study was dedicated to providing a theoretical guidance for an effective regulation of CW-MFC treatment on nickel-containing wastewater and accompanied by bioelectricity generation via the introduction of optimal substrate.
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Affiliation(s)
- Zhan Cheng
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Dayong Xu
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China.
| | - Qingyun Zhang
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Zhengkai Tao
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Ran Hong
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Yu Chen
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Xiaolu Tang
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Shuai Zeng
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
| | - Siyu Wang
- School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu, 241000, Anhui, China
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7
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Niu Y, Qu M, Du J, Wang X, Yuan S, Zhang L, Zhao J, Jin B, Wu H, Wu S, Cao X, Pang L. Effects of multiple key factors on the performance of petroleum coke-based constructed wetland-microbial fuel cell. CHEMOSPHERE 2023; 315:137780. [PMID: 36623598 DOI: 10.1016/j.chemosphere.2023.137780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/03/2023] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
In this study, two constructed wetland-microbial fuel cells (CW-MFC), including a closed-circuit system (CCW-MFC) and an open-circuit system (OCW-MFC) with petroleum coke as electrode and substrate, were constructed to explore the effect of multiple key factors on their operation performances. Compared to a traditional CW, the CCW-MFC system showed better performance, achieving an average removal efficiency of COD, NH4+-N, and TN of 94.49 ± 1.81%, 94.99 ± 4.81%, and 84.67 ± 5.6%, respectively, when the aeration rate, COD concentration, and hydraulic retention time were 0.4 L/min, 300 mg/L, and 3 days. The maximum output voltage (425.2 mV) of the CCW-MFC system was achieved when the aeration rate was 0.2 L/min. In addition, the CCW-MFC system showed a greater denitrification ability due to the higher abundance of Thiothrix that might attract other denitrifying bacteria, such as Methylotenera and Hyphomicrobium, to participate in the denitrifying process, indicating the quorum sensing could be stimulated within the denitrifying microbial community.
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Affiliation(s)
- Yulong Niu
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
| | - Mingxiang Qu
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
| | - Jingjing Du
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China.
| | - Xilin Wang
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
| | - Shuaikang Yuan
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
| | - Lingyan Zhang
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China
| | - Jianguo Zhao
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China
| | - Baodan Jin
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China
| | - Haiming Wu
- School of Environmental Science & Engineering, Shandong University, Qingdao, China
| | - Shubiao Wu
- Department of Agroecology, Aarhus University, Tjele, Denmark
| | - Xia Cao
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China.
| | - Long Pang
- School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, China; Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, Henan, China
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Constructed Wetland Coupled Microbial Fuel Cell: A Clean Technology for Sustainable Treatment of Wastewater and Bioelectricity Generation. FERMENTATION-BASEL 2022. [DOI: 10.3390/fermentation9010006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The availability of clean water and the depletion of non-renewable resources provide challenges to modern society. The widespread use of conventional wastewater treatment necessitates significant financial and energy expenditure. Constructed Wetland Microbial Fuel Cells (CW-MFCs), a more recent alternative technology that incorporates a Microbial Fuel Cell (MFC) inside a Constructed Wetland (CW), can alleviate these problems. By utilizing a CW’s inherent redox gradient, MFC can produce electricity while also improving a CW’s capacity for wastewater treatment. Electroactive bacteria in the anaerobic zone oxidize the organic contaminants in the wastewater, releasing electrons and protons in the process. Through an external circuit, these electrons travel to the cathode and produce electricity. Researchers have demonstrated the potential of CW-MFC technology in harnessing bio-electricity from wastewater while achieving pollutant removal at the lab and pilot scales, using both domestic and industrial wastewater. However, several limitations, such as inadequate removal of nitrogen, phosphates, and toxic organic/inorganic pollutants, limits its applicability on a large scale. In addition, the whole system must be well optimized to achieve effective wastewater treatment along with energy, as the ecosystem of the CW-MFC is large, and has diverse biotic and abiotic components which interact with each other in a dynamic manner. Therefore, by modifying important components and optimizing various influencing factors, the performance of this hybrid system in terms of wastewater treatment and power generation can be improved, making CW-MFCs a cost-effective, cleaner, and more sustainable approach for wastewater treatment that can be used in real-world applications in the future.
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Wang W, Wang J, Wang X, Cui Y, Zhai T, Wu H, Wang S. Performance and mechanism of azo dyes degradation and greenhouse gases reduction in single-chamber electroactive constructed wetland system. BIORESOURCE TECHNOLOGY 2022; 365:128142. [PMID: 36257526 DOI: 10.1016/j.biortech.2022.128142] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/10/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
A single-chamber microbial fuel cell-microbial electrolytic cell with a novel constructed wetland system was proposed for synergistic degradation of congo red and reduction in emissions of greenhouse gases. The closed-circuit system showed higher chemical oxygen demand and congo red removal efficiencies by 98 % and 96 % on average, respectively, than traditional constructed wetland. It could also significantly reduce the emissions of CH4 and N2O (about 52 % CO2-equivalents) by increasing the electron transfer. Microbial community analysis demonstrated that the progressive enrichment of dye-degrading microorganisms (Comamonas), electroactive bacteria (Tolumonas, Trichococcus) and denitrifying microorganisms (Dechloromonas) promoted pollutant removal and electron transfer. Based on gene abundance of xenobiotics biodegradation, the congo red biodegradation pathway was described as congo red → naphthalene and alcohols → CO2 and H2O. In summary, the single-chamber closed-circuit system could significantly improve the degradation of congo red and reduce the emissions of greenhouse gases by influencing electron transfer and microbial activity.
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Affiliation(s)
- Wenyue Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, PR China
| | - Junru Wang
- Jinan Municipal Engineering Design and Research Institute (Group) Co., Ltd., Jinan 250003, PR China
| | - Xu Wang
- Qingdao Sage Yi Chen Environmental Protection Co., Ltd., Qingdao 266075, PR China
| | - Yuqian Cui
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, PR China
| | - Tianyu Zhai
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, PR China
| | - Huazhen Wu
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Sen Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, PR China.
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Tao Z, Jing Z, Tao M, Chen R. Recycled utilization of ryegrass litter in constructed wetland coupled microbial fuel cell for carbon-limited wastewater treatment. CHEMOSPHERE 2022; 302:134882. [PMID: 35551945 DOI: 10.1016/j.chemosphere.2022.134882] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/22/2022] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
To solve wetland plant litter disposal and improve the nitrogen removal of carbon-limited wastewater, the integration of microbial fuel cell (MFC) and recycled utilization of ryegrass litter planted in constructed wetland (CW) may be effective. CW and MFC-CW with periodical ryegrass litter addition (10 days one cycle) were constructed to study the effects of ryegrass litter on nitrogen removal, electricity production and microorganism community. The results showed that total nitrogen removal of CW and MFC-CW after ryegrass litter addition reached 80.54 ± 10.99% and 81.94 ± 7.30%, increased by 22.19% and 17.50%, respectively. Three-dimensional excitation emission matrix fluorescence spectroscopy results revealed that the soluble organic matters produced by the hydrolyzed ryegrass litter were mainly tryptophan, tyrosine and fulvic acid, which promoted the growth of microorganisms and denitrification. The dosage of 200 g m-2 did not cause the rise of refractory organic matter in the effluent. The ryegrass litter addition promoted the average voltage and power density slightly in MFC-CW, but the internal resistance also increased temporarily. Compared to the sole CW, current stimulation caused by MFC not only helped to increase the denitrification, but also accelerated the biomass hydrolysis. MFC could contribute to the enrichment and growth of functional microorganisms related to denitrification and organic degradation, such as Vogesella, Devosia, Thermomonas and Brevibacterium. The bacterial genera involved in the ryegrass litter degradation were mainly Thermomonas, Propionicimonas, TM7a, Clostridium_sensu_stricto_1 and so on. This study provided a promising way for practical applications of MFC-CW in the treatment of carbon-limited wastewater, especially in small ecological facilities.
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Affiliation(s)
- Zhengkai Tao
- College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Zhaoqian Jing
- College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China.
| | - Mengni Tao
- College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Renjie Chen
- College of Civil Engineering, Nanjing Forestry University, Nanjing, 210037, China
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