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Li C, Yuan Q, Hao L, Xu M, Cao J, Liu W. Synergistic reduction of pollution and carbon mitigation in constructed wetlands-microbial fuel cell using sludge-derived biochar. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 939:172979. [PMID: 38705303 DOI: 10.1016/j.scitotenv.2024.172979] [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: 02/12/2024] [Revised: 04/08/2024] [Accepted: 05/02/2024] [Indexed: 05/07/2024]
Abstract
Integrating microbial fuel cells (MFC) into constructed wetland systems (CW) has been an efficient wastewater treatment to improve the pollutants removal and regenerate power energy. This study fabricated a sludge biochar material (SBM) to sequestrate the carbon of residual sludge. Thereafter used SBM and modified SBM as the substrate materials to construct three groups of CW-MFC for decreasing the greenhouse gas (GHG) emission. The water quality improvement in removal efficiency achieved (2.59 %, 3.10 %, 5.21 % for COD; 3.31 %, 3.60 %, 6.71 % for TN; 1.80 %, 7.38 %, 4.93 % for TP) by the application of MFC, SBM, and modified SBM in wastewater treatment, respectively. Additionally, the reduction in global warming potential (GWP) realized 17.2 %, 42.2 %, and 64.4 % resulting from these applications. The carbon flow and fate diagrams showed MFC shifted the gas phase‑carbon flow from CH4 to CO2, and SBM promoted this shift trends. Microbial diversity indicated enrichment of electrochemically active bacteria (EAB), denitrifying bacteria, and phosphate accumulating organisms (PAOs) by SBM. Metabolic pathways analysis showed that introduction of MFC and SBM exhibited significant increases of key functional genes in metabolic pathway of anaerobic oxidation of methane (AOM). This study highlights the benefit of CW-MFC in and provides a new strategy for removing pollutants and abating GHG emissions in wastewater treatment.
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Affiliation(s)
- 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
| | - Quan Yuan
- 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
| | - 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
| | - Ming Xu
- 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.
| | - 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
| | - Weijing Liu
- Jiangsu Provincial Academy of Environmental Science, Nanjing 210036, China
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Zhou X, Li H, Wang A, Wang X, Chen X, Zhang C. Subsurface wastewater infiltration systems for nitrogen pollution control. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2024; 96:e11061. [PMID: 38881414 DOI: 10.1002/wer.11061] [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: 02/21/2024] [Revised: 05/20/2024] [Accepted: 05/23/2024] [Indexed: 06/18/2024]
Abstract
Subsurface wastewater infiltration systems (SWISs) are suggested to be a cost-effective and environmentally friendly method for sewage treatment. However, a comprehensive summary of the relevant mechanisms and optimization methods for nitrogen (N) removal in SWIS is currently lacking. In this review, we first summarize the N transformation mechanisms in SWIS. The impact of operational parameters on the N removal efficiency is then delineated. To enhance pollutant removal and minimize resource wastage, it is advisable to maintain a wet-dry ratio of 1:1 and a hydraulic loading rate of 8-10 cm/day. The organic load should be determined based on influent characteristics to optimize the balance between sewage treatment and nitrous oxide (N2O) emission. Finally, various strategies and modifications have been suggested to enhance pollutant removal efficiency and reduce N2O emissions in SWIS, such as artificial aeration, supply electron donors, and well-designed structures. Overall, greater emphasis should be placed on the design and management of SWIS to optimize their co-benefits while effectively controlling N pollution. PRACTITIONER POINTS: SWISs are often considered black boxes with their efficiency depending on hydraulic characteristics, biological characteristics, and substrate properties. Biological nitrification coupled with denitrification is considered to be the major N removal process. Increasing the reduction of N2O to the inert N2 form is a potential mechanism to mitigate global warming. Strategies such as artificial aeration, supply electron donors, and well-designed structures are suggested to improve N removal performance.
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Affiliation(s)
- Xulun Zhou
- School of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Haibo Li
- School of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Ang Wang
- CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
- Key Laboratory of Black Soil Evolution and Ecological Effect, Ministry of Natural Resource, Beijing, China
- Key Laboratory of Black Soil Evolution and Ecological Effect, Shenyang, Liaoning, China
| | - Xueyan Wang
- School of Energy and Water Resources, Shenyang Institute of Technology, Fushun, China
| | - Xi Chen
- School of Resources and Civil Engineering, Northeastern University, Shenyang, China
| | - Chenxi Zhang
- School of Resources and Civil Engineering, Northeastern University, Shenyang, China
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Wang Y, Chen Y, Lu S, Guo X. Development and trends of constructed wetland substrates over the past 30 years: a literature visualization analysis based on CiteSpace. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:14537-14552. [PMID: 38308167 DOI: 10.1007/s11356-024-32139-x] [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: 09/08/2023] [Accepted: 01/18/2024] [Indexed: 02/04/2024]
Abstract
Constructed wetland substrates (CWSs) have received considerable attention owing to their importance in adsorbing and degrading pollutants, providing growth attachment points for microorganisms, and supporting wetland plants. There are differences in the configurations and functions of constructed wetlands (CWs) for treating different water bodies and sewage, resulting in a wide variety of substrates. Research on the application and mechanism of CWSs is not sufficiently systematic. Therefore, the current research advancements and hotspots must be identified. Hence, we used CiteSpace to analyze 1955 English publications from the core collection database of the Web of Science to assess the current state of the CWS research field. Based on the cooperative network analysis, the roles of various countries, institutions, and authors in research on CWSs were reviewed. Keyword co-occurrence and cluster analyses were used to discuss the transformation of CWSs from removing traditional pollutants to emerging pollutants and the transition from incorporating natural substrates to artificial substrates. Finally, we underscored the need for more emphasis to be placed on the collocation and application of the CWSs at different latitudes. Furthermore, the substrate micro-interface process and its effects on the interaction patterns of pollutants and microorganisms should be thoroughly investigated to provide theoretical guidance for the development of wetland applications and mechanisms.
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Affiliation(s)
- Yongqiang Wang
- State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Research Centre of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Yi Chen
- Key Laboratory of the Three Gorges Region's Eco-Environment, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400044, China
| | - Shaoyong Lu
- State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Research Centre of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
| | - Xiaochun Guo
- State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory for Lake Pollution Control, National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Research Centre of Lake Environment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
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4
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Wang W, Dong L, Zhai T, Wang W, Wu H, Kong F, Cui Y, Wang S. Bio-clogging mitigation in constructed wetland using microbial fuel cells with novel hybrid air-photocathode. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 881:163423. [PMID: 37062319 DOI: 10.1016/j.scitotenv.2023.163423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 04/05/2023] [Accepted: 04/06/2023] [Indexed: 06/01/2023]
Abstract
Excessive accumulation of extracellular polymeric substances (EPS) in constructed wetland (CW) substrate can lead to bio-clogging and affect the long-term stable operation of CW. In this study, a microbial fuel cell (MFC) was coupled with air-photocathode to mitigate CW bio-clogging by enhancing the micro-electric field environment. Because TiO2/biochar could catalyze and accelerate oxygen reduction reaction, further promoting the gain of electric energy, the electricity generation of the tandem CW-photocatalytic fuel cell (CW-PFC) reached 90.78 mW m-3. After bio-clogging was mitigated in situ in tandem CW-PFC, the porosity of CW could be restored to about 62.5 % of the initial porosity, and the zeta potential of EPS showed an obvious increase (-14.98 mV). The removal efficiencies of NH4+-N and chemical oxygen demand (COD) in tandem CW-PFC were respectively 31.8 ± 7.2 % and 86.1 ± 6.8 %, higher than those in control system (21.1 ± 11.0 % and 73.3 ± 5.6 %). Tandem CW-PFC could accelerate the degradation of EPS into small molecules (such as aromatic protein) by enhancing the electron transfer. Furthermore, microbiome structure analysis indicated that the enrichment of characteristic microorganisms (Anaerovorax) for degradation of protein-related pollutants, and electroactive bacteria (Geobacter and Trichococcus) promoted EPS degradation and electron transfer. The degradation of EPS might be attributed to the up-regulation of the abundances of carbohydrate and amino acid metabolism. This study provided a promising new strategy for synergic mitigation and prevention of bio-clogging in CW by coupling with MFC and photocatalysis.
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Affiliation(s)
- Wenyue Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China
| | - Liu Dong
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China
| | - Tianyu Zhai
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China
| | - Wenpeng Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China
| | - Huazhen Wu
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China
| | - Fanlong Kong
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China
| | - Yuqian Cui
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China.
| | - Sen Wang
- College of Environmental Science and Engineering, Qingdao University, Qingdao 266071, China; Carbon Neutrality and Eco-Environmental Technology Innovation Center of Qingdao, Qingdao 266071, China.
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Huang L, Xiong H, Jiang C, He J, Lyu W, Chen Y. Pathways and biological mechanisms of N 2O emission reduction by adding biochar in the constructed wetland based on 15N stable isotope tracing. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 342:118359. [PMID: 37311348 DOI: 10.1016/j.jenvman.2023.118359] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 05/31/2023] [Accepted: 06/07/2023] [Indexed: 06/15/2023]
Abstract
Constructed wetlands (CWs) added with biochar were built to study pollutant removal efficiencies, nitrous oxide (N2O) emission characteristics, and biological mechanisms in nitrogen transformation. The results showed that biochar addition enhanced the average removal rates of ammonium (NH4+-N), total nitrogen, and chemical oxygen demand by 4.03-18.5%, 2.90-4.99%, and 2.87-5.20% respectively while reducing N2O emissions by 25.85-83.41%. Based on 15N stable isotope tracing, it was found that nitrification, denitrification, and simultaneous nitrification and denitrification were the main processes contributing to N2O emission. The addition of biochar resulted in maximum reduction rates of 71.50%, 80.66%, and 73.09% for these three processes, respectively. The relative abundance of nitrogen-transforming microbes, such as Nitrospira, Dechloromonas, and Denitratisoma, increased after the addition of biochar, promoting nitrogen removal and reducing N2O emissions. Adding biochar could increase the functional gene copy number and enzyme activity responsible for nitrogen conversion, which helped achieve efficient NH4+-N oxidation and eliminate nitrite accumulation, thereby reducing N2O emissions.
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Affiliation(s)
- Lei Huang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China; Chongqing Engineering Research Center of Rural Cleaner Production, Chongqing, 400716, PR China.
| | - Haifeng Xiong
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Chunli Jiang
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Jinke He
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Wanlin Lyu
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China
| | - Yucheng Chen
- Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, 400715, PR China; Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing, 400716, PR China; Chongqing Engineering Research Center of Rural Cleaner Production, Chongqing, 400716, PR China
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Zhang N, Lu D, Sheng H, Xia J, Kan P, Yao Z, Chen H, Li G, Zhu DZ, Liu H. Constructed wetlands as hotspots of antibiotic resistance genes and pathogens: Evidence from metagenomic analysis in Chinese rural areas. JOURNAL OF HAZARDOUS MATERIALS 2023; 447:130778. [PMID: 36641844 DOI: 10.1016/j.jhazmat.2023.130778] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/06/2022] [Accepted: 01/10/2023] [Indexed: 06/17/2023]
Abstract
In rural China, many constructed wetlands (CWs) have been developed to treat rural wastewater sustainably. However, due to the scarce information on those rural CWs, it is difficult to analyze the biological contaminants within those systems, such as antibiotic resistance genes (ARGs) and pathogens. Based on the data collected from two pilot-scale, one-year-observed CWs, for the first time, this study explored the accumulation of ARGs and pathogens using the metagenomic sequencing approach and SourceTracker analysis under different hydraulic loading rates. The Shannon index of ARGs in the effluent surpassed the level found in the influent. The DESeq2 analysis showed that up to 21.49% of the total pathogen species had increased relative abundance in the effluent compared with the influent. By combining the contribution of substrate and rhizosphere, the CW became a more influencing factor for ARGs and pathogens contamination than the influent. The network analysis revealed a critical but latent fact that the development of antibiotic-resistant pathogens is highly likely to be triggered by the co-occurrence of ARGs and pathogens. Collectively, from the aspect of biological risk, our study showed that CWs alone might not be an ideal solution for improving wastewater treatment in rural China.
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Affiliation(s)
- Nan Zhang
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Dingnan Lu
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Huafeng Sheng
- School of Marine Sciences, Ningbo University, Ningbo 315211, China
| | - Jingjing Xia
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Peiying Kan
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Zhiyuan Yao
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China.
| | - Huaihai Chen
- State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-sen University, Shenzhen 518107, China
| | - Gang Li
- CAS Engineering Laboratory for Recycling Technology of Municipal Solid Waste, CAS Key Lab of Urban Environment and Health, Ningbo Urban Environmental Observatory and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - David Z Zhu
- School of Civil & Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China; Institute of Ocean Engineering, Ningbo University, Ningbo 315211, China
| | - Hongzhi Liu
- Chinese Society for Environmental Sciences, Beijing 100082, China
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Liu A, Zhao Y, Cai Y, Kang P, Huang Y, Li M, Yang A. Towards Effective, Sustainable Solution for Hospital Wastewater Treatment to Cope with the Post-Pandemic Era. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:2854. [PMID: 36833551 PMCID: PMC9957062 DOI: 10.3390/ijerph20042854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/01/2023] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has spread across the globe since the end of 2019, posing significant challenges for global medical facilities and human health. Treatment of hospital wastewater is vitally important under this special circumstance. However, there is a shortage of studies on the sustainable wastewater treatment processes utilized by hospitals. Based on a review of the research trends regarding hospital wastewater treatment in the past three years of the COVID-19 outbreak, this review overviews the existing hospital wastewater treatment processes. It is clear that activated sludge processes (ASPs) and the use of membrane bioreactors (MBRs) are the major and effective treatment techniques applied to hospital wastewater. Advanced technology (such as Fenton oxidation, electrocoagulation, etc.) has also achieved good results, but the use of such technology remains small scale for the moment and poses some side effects, including increased cost. More interestingly, this review reveals the increased use of constructed wetlands (CWs) as an eco-solution for hospital wastewater treatment and then focuses in slightly more detail on examining the roles and mechanisms of CWs' components with respect to purifying hospital wastewater and compares their removal efficiency with other treatment processes. It is believed that a multi-stage CW system with various intensifications or CWs incorporated with other treatment processes constitute an effective, sustainable solution for hospital wastewater treatment in order to cope with the post-pandemic era.
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Affiliation(s)
- Ang Liu
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
| | - Yaqian Zhao
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
| | - Yamei Cai
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
| | - Peiying Kang
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
| | - Yulong Huang
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
| | - Min Li
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
| | - Anran Yang
- State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China
- Department of Municipal and Environmental Engineering, School of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China
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Tang P, Chen L, Zhang W, Zhou Y. Bioclogging alleviation for constructed wetland based on the interaction among biofilm growth and hydrodynamics. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:18755-18763. [PMID: 36219300 DOI: 10.1007/s11356-022-23459-x] [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: 06/20/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
Bioclogging is the most crucial operation problem of the constructed wetlands, which reduce its removal efficiency and life span. A strategy through properly increasing hydraulic loading is proposed in this study to alleviate the bioclogging for CWs. The two-dimensional porous media flow cell (2D PMFC) test indicated that a quadratic correlation was found between local biofilms growth rate and the near-wall Reynolds number (r > 0.765, p < 0.05). The biofilm growth rate declined with the flowrate when Re exceeded about 6.0. It was also found that the higher flowrate (6 mL/min) lead to the homogeneous biofilm and velocity distribution in the PMFC. The column test indicated that the highest hydraulic loading (9.2 cm/h) produced the smallest decrease in hydraulic conductivity, which was 80 times more than that of low hydraulic load (3.0 cm/h) at the end (40 days) of experiment. Moreover, the relatively homogenized distribution of biofilm was found along the column with the highest hydraulic loading, which confirmed that the proper increase in hydraulic loading can alleviate bioclogging.
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Affiliation(s)
- Ping Tang
- College of Material and Environment Engineering, Hangzhou Dianzi University, Hangzhou, China
| | - Li Chen
- College of Material and Environment Engineering, Hangzhou Dianzi University, Hangzhou, China
| | - Wenming Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, T6G 2W2, Canada
| | - Yongchao Zhou
- Key Laboratory of Drinking Water Safety and Distribution Technology of Zhejiang Province, Zhejiang University, Hangzhou, China.
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Bessadok S, Kraiem K, Arous F, Al Souki KS, Tabassi D, El Toumi S, Jaouani A. Efficient Wastewater Treatment and Removal of Bisphenol A and Diclofenac in Mesocosm Flow Constructed Wetlands Using Granulated Cork as Emerged Substrate. TOXICS 2023; 11:toxics11010081. [PMID: 36668807 PMCID: PMC9864862 DOI: 10.3390/toxics11010081] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 12/13/2022] [Accepted: 01/12/2023] [Indexed: 05/21/2023]
Abstract
Constructed wetlands (CWs) are considered as low-cost and energy-efficient wastewater treatment systems. Media selection is one of the essential technical keys for their implementation. The purpose of this work was essentially to evaluate the removal efficiency of organic pollution and nitrogen from municipal wastewater (MWW) using different selected media (gravel/gravel amended with granulated cork) in mesocosm horizontal flow constructed wetlands (HFCWs). The results showed that the highest chemical oxygen demand (COD) and ammonium nitrogen removal of 80.53% and 42%, respectively, were recorded in the units filled with gravel amended with cork. The influence of macrophytes (Phragmites australis and Typha angustifolia) was studied and both species showed steeper efficiencies. The system was operated under different hydraulic retention times (HRTs) i.e., 6 h, 24 h, 30 h, and 48 h. The obtained results revealed that the COD removal efficiency was significantly enhanced by up to 38% counter to the ammonium rates when HRT was increased from 6 h to 48 h. Moreover, the removal efficiency of two endocrine-disrupting compounds (EDCs) namely, bisphenol A (BPA) and diclofenac (DCF) was investigated in two selected HFCWs, at 48 h HRT. The achieved results proved the high capacity of cork for BPA and DCF removal with the removal rates of 90.95% and 89.66%, respectively. The results confirmed the role of these engineered systems, especially for EDC removal, which should be further explored.
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Affiliation(s)
- Salma Bessadok
- Bioresources, Environment and Biotechnology Laboratory (LR22ES04), Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, Tunis 1006, Tunisia
| | - Khadija Kraiem
- Bioresources, Environment and Biotechnology Laboratory (LR22ES04), Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, Tunis 1006, Tunisia
| | - Fatma Arous
- Bioresources, Environment and Biotechnology Laboratory (LR22ES04), Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, Tunis 1006, Tunisia
| | - Karim Suhail Al Souki
- Department of Environmental Chemistry and Technology, Faculty of Environment, Jan Evangelista Purkyně University in Ústí nad Labem, Pasteurova 3632/15, 400 96 Ústí nad Labem, Czech Republic
| | - Dorra Tabassi
- Bioresources, Environment and Biotechnology Laboratory (LR22ES04), Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, Tunis 1006, Tunisia
| | - Safa El Toumi
- Bioresources, Environment and Biotechnology Laboratory (LR22ES04), Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, Tunis 1006, Tunisia
| | - Atef Jaouani
- Bioresources, Environment and Biotechnology Laboratory (LR22ES04), Higher Institute of Applied Biological Sciences of Tunis, University of Tunis El Manar, Tunis 1006, Tunisia
- Correspondence:
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10
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Cocozza C, Di Iaconi C, Murgolo S, Traversa A, De Mastro F, De Sanctis M, Altieri VG, Cacace C, Brunetti G, Mascolo G. Use of constructed wetlands to prevent overloading of wastewater treatment plants. CHEMOSPHERE 2023; 311:137126. [PMID: 36334739 DOI: 10.1016/j.chemosphere.2022.137126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/14/2022] [Accepted: 10/31/2022] [Indexed: 06/16/2023]
Abstract
The fluctuation in the number of people in tourist areas affects the wastewater quality and quantity. Constructed wetlands (CWs) aim to simulate physical, chemical, and biological processes occurring in natural environments for wastewater treatment and are considered a sustainable system. The current study aimed at evaluating the effectiveness of in-vessel CWs for supporting the wastewaters treatment plants in periods of overloading. Such approach can be quickly implementable, economic, and the CWs can be fast regenerated in the framework of sustainable good practices. Three pilot scale CWs were prepared in as many containers layering 10 cm of gravel, 60 cm of sand and 10 cm of gravel, and placing pieces of giant reed rhizomes in the upper layers. The bottom of each CW had a tap, and CWs were irrigated with a real municipal sewage three times a week. Before each new irrigation, the tap was opened, and the effluent collected for determining gross parameters, elemental composition, and contaminants of emerging concern (CECs). CWs significantly reduced almost all gross parameters considered and half the CECs, except for a couple of metabolites of corresponding parental compounds. With regards to the potentially toxic elements, all reduced their concentration from the influents to the effluents. The results of this study were promising and highlighted good efficiency of constructed wetlands as pre-treatment of real municipal sewage to reduce the overloading of the wastewater treatment plant.
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Affiliation(s)
- Claudio Cocozza
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, University of Bari, Via Amendola 165/A, 70126, Bari, Italy
| | - Claudio Di Iaconi
- CNR, Istituto di Ricerca Sulle Acque, Via F. De Blasio 5, Bari, 70132, Italy
| | - Sapia Murgolo
- CNR, Istituto di Ricerca Sulle Acque, Via F. De Blasio 5, Bari, 70132, Italy
| | - Andreina Traversa
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, University of Bari, Via Amendola 165/A, 70126, Bari, Italy.
| | - Francesco De Mastro
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, University of Bari, Via Amendola 165/A, 70126, Bari, Italy
| | - Marco De Sanctis
- CNR, Istituto di Ricerca Sulle Acque, Via F. De Blasio 5, Bari, 70132, Italy
| | | | - Claudio Cacace
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, University of Bari, Via Amendola 165/A, 70126, Bari, Italy
| | - Gennaro Brunetti
- Dipartimento di Scienze del Suolo, della Pianta e degli Alimenti, University of Bari, Via Amendola 165/A, 70126, Bari, Italy
| | - Giuseppe Mascolo
- CNR, Istituto di Ricerca Sulle Acque, Via F. De Blasio 5, Bari, 70132, Italy; CNR, Istituto di Ricerca per la Protezione Idrogeologica, Via Amendola 122 I, Bari, 70126, Italy
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Vaudry N, Sun Y, Afolabi OOD. Exploiting constructed wetlands for industrial effluent phytodesalination in Jing-Jin-Ji urban agglomeration, China. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2023; 25:851-867. [PMID: 36028956 DOI: 10.1080/15226514.2022.2115005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The unsustainable exploitation of water resources and growing salinization impacting China's Beijing-Tianjin-Hebei (Jing-Jin-Ji) agglomeration threatens the region's economic growth and drives the exploration of alternative resources. The region's industries face a financial burden due to increasing constraints on water exploitation and discharge regulations. These have resulted in increased industrial salt concentration rejections/discharges, meanwhile, constructed wetlands (CWs), deployed as a perfunctory receptacle for industrial effluents in the region, are underexploited for treating/removing salts. Also, halophytic plants local to the region have promising chloride uptake (60.6 g/kg and 256.0 g/kg of plant dry weight) and can reduce water conductivity by 40%. Exploitation of CWs, using local halophytes has not been explored for phytodesalination purposes in the region. Hence, this study analyses the water resource and salinization crisis in the agglomeration and further evaluates workable potential and critical technical considerations for using local halophytes in CWs to treat industrial salt-laden effluents. While acknowledging this intervention for removing industrial effluent salt may not meet compliance in the region, effluent post-phytodesalination presents opportunities for industries to meet regulatory stipulations on water reuse rates. Furthermore, such effluent may be used for irrigation and can ameliorate the salinization and groundwater exploitation crisis as a cleaner recharge source.
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Affiliation(s)
- Nolwenn Vaudry
- School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, UK
| | - Yi Sun
- U.F.R. de Langues Etrangères, Artois University, Arras Cedex, France
| | - Oluwasola O D Afolabi
- School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, UK
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