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Performance of different macrophytes in the decontamination of and electricity generation from swine wastewater via an integrated constructed wetland-microbial fuel cell process

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Journal of Environmental Sciences 2020年第3期32卷 252-263页

作者： Feng Liu Lei Sun Jinbao Wan Liang Shen Yanhong Yu Lingling Hu Ying Zhou School of Resources Environmental&Chemical Engineering Nanchang UniversityJiangxi 330031China School of Chemistry and Chemical Engineering Jiangxi Science and Technology Normal UniversityJiangxi 330013China Jiangxi Engineering Laboratory of Waterborne Coating School of Chemistry and Chemical EngineeringJiangxi Science and Technology Normal UniversityJiangxi 330013China School of Materials and Mechanical&Electrical Engineering Jiangxi Science and Technology Normal UniversityJiangxi 330013China

Plants constitute a major element of constructed wetlands(CWs).In this study,a coupled system comprising an integrated vertical flow CW(IVCW) and a microbial fuel cell(MFC) for swine wastewater tre atment was developed to research the effects of macrophytes commonly employed in CWs,Canna indica,Acorus calamus,and Ipomoea aquatica,on decontamination and electricity production in the system.Because of the different root types and amounts of oxygen released by the roots,the rates of chemical oxygen demand(COD) and ammonium nitrogen(NH4^+-N) removal from the swine wastewater differed as well.In the unplanted,Canna indica,Acorus calamus,and Ipomoea aquatica systems,the COD removal rates were 80.20%,88.07%,84.70%,and 82.20%,respectively,and the NH4+-N removal rates were 49.96%,75.02%,70.25%,and 68.47%,respectively.The decontamination capability of the Canna indica system was better than those of the other systems.The average output voltages were 520±42,715±20,660±27,and 752±26 mV for the unplanted,Canna indica,Acorus calamus,and Ipomoea aquatica systems,respectively,and the maximum power densities were 0.2230,0.4136,0.3614,and0.4964 W/m^3,respectively.Ipomoea aquatica had the largest effect on bioelectricity generation promotion.In addition,electrochemically active bacteria,Geobacter and Desulfuromonas,were detected in the anodic biofilm by high-throughput sequencing analysis,and Comamonas(Proteobacteria),which is widely found in MFCs,was also detected in the anodic biofilm.These results confirmed the important role of plants in IVCW-MFCs.

关键词： Integrated vertical flow constructed wetland Microbial fuel cell Swine wastewater Dissolved oxygen(DO)

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Predicting pollutant removal in constructed wetlands using artificial neural networks(ANNs)

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Water Science and Engineering 2020年第1期13卷 14-23页

作者： Christopher Kiiza Shun-qi Pan Bettina Bockelmann-Evans Akintunde Babatunde Hydro-environmental Research Centre School of EngineeringCardiff UniversityThe ParadeCardiff CF243AAUK School of Civil Engineering University of LeedsLeeds LS29JTUK

Growth in urban population,urbanisation,and economic development has increased the demand for water,especially in water-scarce regions.Therefore,sustainable approaches to water management are needed to cope with the effects of the urbanisation on the water environment.This study aimed to design novel configurations of tidal-flow vertical subsurface flow constructed wetlands(VFCWs)for treating urban stormwater.A series of laboratory experiments were conducted with semi-synthetic influent stormwater to examine the effects of the design and operation variables on the performance of the VFCWs and to identify optimal design and operational strategies,as well as maintenance requirements.The results show that the VFCWs can significantly reduce pollutants in urban stormwater,and that pollutant removal was related to specific VFCW designs.Models based on the artificial neural network(ANN)method were built using inputs derived from data exploratory techniques,such as analysis of variance(ANOVA)and principal component analysis(PCA).It was found that PCA reduced the dimensionality of input variables obtained from different experimental design conditions.The results show a satisfactory generalisation for predicting nitrogen and phosphorus removal with fewer variable inputs,indicating that monitoring costs and time can be reduced.

关键词： constructed wetlands Urban stormwater Pollutant removal Artificial neural networks(ANNs) Principal component analysis(PCA)

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Removal of tetrachlorobisphenol A and the effects on bacterial communities in a hybrid sequencing biofilm batch reactor-constructed wetland system

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 147-157页

作者： Xiaohui Wang Shuai Du Tao Ya Zhiqiang Shen Jing Dong Xiaobiao Zhu Department of Environ mental Scie nee and Engineering College of Chemical Engineering Beijing University of Chemical TechnologyBeijing 100029 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing 100012 China Beijing Municipal Research Institute of Environmental Protection Beijing 100037 China

Tetrachlorobisphenol A (TCBPA) released into the sewage may cause environmental pollution and health risk to human beings. The objective of this study was to investigate the removal ofTCBPA and bacterial community structures in a laboratory-scale hybrid sequencing biofilm batch reactor (SBBR)- constructed wetland (CW) system. The results showed that the removal efficiency of chemical oxidation demand (COD), ammonia, total nitrogen and total phosphorus in the SBBR-CW system was 96.7%, 97.3%, 94.4%, and 8&6% respectively. At the stable operation stage, the system obtained a 71.7%±1.8% of TCBPA removal efficiency with the influent concentration at 200μg/L. Illumina MiSeq sequencing of 16S rRNA gene revealed that the presence of TCBPA not only reduced the bacterial diversity in the SBBR-CW system, but also altered the composition and structure of bacterial community. After the addition of TCBPA, Proteobacteria increased from 31.3% to 38.7%, while Acidobacteria and Parcubacteria decreased greatly in the SBBR. In contrast, Acidobacteria replaced Proteobacteria as the dominant phylum in the upper soils of CW. The results indicated that TCBPA stimulated the growth of GAOs in the SBBR without deteriorating the phosphorus removal due to the presence of sufficient carbon sources. The ammonia oxidizing bacteria, Nitrosomonas, and denitrification bacteria, Hyphomicrobium and Pseudomonas, were inhibited by TCBPA, resulting in a decreasing the removal efficiency of TN and ammonia.

关键词： SBBR constructed wetland Tetrachlorobisphenol A Microbial community structure

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Effect of Hydraulic Loading Rate on the Efficiency of Effluent Treatment in a Recirculating Puffer Aquaculture System Coupled with constructed Wetlands

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Journal of Ocean University of China 2014年第1期13卷 146-152页

作者： XU Jiabo SHI Yonghai ZHANG Genyu LIU Jianzhong ZHU Yazhu Shanghai Fisheries Research Institute Shanghai Fisheries Technical Extension Station

constructed wetlands(CWs) were integrated into an indoor recirculating aquaculture system of obscure puffer(Takifugu obscurus) for effluent treatment. The effect of hydraulic loading rate(HLR) on the efficiency of effluent treatment by CWs was examined for over a month. The CWs were operated under brackish conditions(salinity 7.4–7.6) at 3 different HLRs(0.762, 0.633, and 0.458 m d–1) 3 times, 10 days each. Overall, the CWs exhibited high efficiency in removal of total ammonium nitrogen(by 81.03–92.81%) and nitrite nitrogen(by 99.40%–99.68%). The efficiency of CWs in removal of total ammonium nitrogen, nitrate nitrogen, total Kjeldahl nitrogen, total phosphorous, and total suspended solids(TSS) increased with the decrease of HLR. The CWs operated at the 3 HLRs in a decreasing trend proves to be effective, providing a useful method for effluent treatment in commercial puffer aquaculture systems.

关键词： constructed wetland recirculating aquaculture system puffer aquaculture brackish water hydraulic loading rate

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Performance of Phragmites Australis and Cyperus Papyrus in the treatment of municipal wastewater by vertical flow subsurface constructed wetlands

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International Soil and Water Conservation Research 2019年第3期7卷 286-296页

作者： Fernando García-(A)vila Jhanina Pati(n)o-Chávez Fanny Zhinín-Chimbo Silvana Donoso-Moscoso Lisveth Flores del Pino Alex Avilés-A(n)azco Facultad de Ciencias Químicas Universidad de CuencaCuenca010107Ecuador Facultad de Ciencias Universidad Nacional Agraria La MolinaLima12175Peru

The use of constructed wetlands to treat municipal wastewater reduces energy consumption and therefore economic costs,as well as reduces environmental pollution.The purpose of this study was to compare the purification capacity of domestic wastewater using two species of plants sown in subsurface constructed wetlands with vertical flow built on a small scale that received municipal wastewater with primary treatment.The species used were Phragmites Australis and Cyperus Papyrus.For this purpose,a constant flow of 0.6 m3 day-1 was fed from the primary lagoon to each of the two wetlands built on a pilot scale with continuous flow.Each unit was filled with granite gravel in the lower part and with silicic sand in the upper part of different granulometry,the porosity of the medium was 0.34,with a retention time of 1.12 days and a hydraulic load rate of 0.2 m day-1.To analyze the purification capacity of wastewater,physical,chemical and biological parameters were monitored during three months.Samples were taken at the entrance and exit in each experimental unit.The results obtained in the experimental tests for the two species of plants,indicated that the Cyperus Papyrus presented a greater capacity of pollutants removal as biochemical oxygen demand (80.69%),chemical oxygen demand (69.87%),ammoniacal nitrogen (69.69%),total phosphorus (50%),total coliforms (98.08%) and fecal coliforms (95.61%).In the case of Phragmites Australis retains more solids.The species with greater efficiency in the treatment of municipal wastewater for this study was Cyperus Papyrus.

关键词： constructed wetland Fitorremediacion Macrophytes Nutrients Wastewater treatment

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Superior drainage treated by combinational technique of biologic contact oxidation and constructed wetland

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Journal of Central South University 2009年第S1期16卷 292-297页

作者：胡学斌徐志恒柴宏祥龙腾锐 Key Laboratory of Three Gorges Reservoir Region's Eco-Environment Ministry of EducationChongqing University Key Laboratory of Three Gorges Reservoir Region’s Eco-Environment Ministry of EducationChongqing University

The superior drainage was pre-treated by biologic contact oxidation on BOD5 load of 0.72 kg/(m3·d),and then post-treated by constructed wetland. The results about the effect on the constructed wetland post-treatment show that the total nitrogen (TN) is the restrictive index of the combinational technique treatment effect. To meet the reclaimed water quality standard and reuse for waterscape,the peak hydraulic load of constructed wetland is 0.50 m/d in summer (30-36 ℃) and 0.33 m/d in winter (8-12℃),and the load ratio of the peak hydraulic under the two temperature conditions is 3-2. The results are combined of reclaimed water quantity requirements in different seasons of green building. Reasonable scale of the reclaimed water treatment systems can be determined. The treatment efficacy can be well predicted,and both the design and operations can be effectively guided,by which the reclaimed water treatment systems regard superior drainage as the source and are purified by combinational technique of contact oxidation and artificial wetland.

关键词： green building biologic contact oxidation constructed wetlands reclaimed water

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constructed Wetland Systems as a Methodology for the Treatment of Wastewater in Bucaramanga Industrial Park

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Journal of Geoscience and Environment Protection 2015年第3期3卷 1-14页

作者： Chukwunonye Ezeah Carlos Alberto Ríos Reyes Jairo Fernando Contreras Gutiérrez Faculty of Sciences and Engineering University of Wolverhampton Wolverhampton UK Universidad Industrial de Santander Bucaramanga Colombia

Effluent discharges from municipal, industrial, and agricultural activities constitute major sources of pollution on land and water bodies. During the 1990s, large-scale application of constructed Wetlands (CWs) as a remediation option drew much attention globally from the public and green groups alike. The most common application of CWs is for flow management in river system and little is documented on using CWs for treating polluted river water. This article goes beyond constructed wetlands as a stand-alone methodology to propose an integrated remediation system incorporating constructed wetlands in Bucaramanga Industrial Park S.A., Santander (Colombia), which will form part of an innovation park. In addition to pollution abatement, the project is projected to provide other environmental benefits to the entire Oro River Sub-basin. Other benefits of the project include mitigation of environmental impacts, improvement in water quality, landscape amenity, as well as tourism and recreational benefits.

关键词： Water Pollution constructed Wetlands Wastewater Integrated Remediation System Tourism and Recreation

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constructed Wetlands as a Natural Resource for Water Quality Improvement in Malaysia

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Natural Resources 2014年第7期5卷 292-298页

作者： Syafiq Shaharuddin Ngai Weng Chan Nor Azazi Zakaria Aminuddin Ab Ghani Chun Kiat Chang Ranjan Roy River Engineering and Urban Drainage Research Center (REDAC) Universiti Sains Malaysia Nibong Tebal Malaysia

Tropical wetlands have numerous natural functions, one of which is the filtration of wastewater for water quality improvement. The aim of this paper is to investigate the performance of constructed wetlands in Universiti Sains Malaysia for water quality treatment of stormwater runoff. A total of 17 sampling stations were selected from different sections of possessing different compositions, characteristics and plant species. Weekly physico-chemical and biological parameters were analysed during the one year period starting from December 2010 to December 2011. The results exhibited significant improvement of water quality as the concentration of nitrate, nitrite, ammoniacal-nitrogen, orthophosphate, TSS, BOD and COD decreased after the water passed through the macrophyte and micropool zones before being discharged to the wetland outlet. The concentration of nitrite was significantly reduced (80%);nitrate (61.56%), ammoniacal-nitrogen (51.49%), orthophosphate (60.98%), TSS (67.86%), BOD (27.7%) and COD (46.43%). The decrease in the concentrations of the above pollutants showed that the improvement of water quality was performed in the wetland. Most of the concentrations fall in Class IIA and IIB based on National Water Quality Standards for Malaysia and Department of Environment (DOE) Water Quality Index Classification. Biological measurement showed high diversity of species. Based on the results obtained, the macrophyte zone showed a high number of species and percentage distribution of phytoplankton and zooplankton, starting from the Wetland 1and 2 until the outlet wetland (14.6% - 14.9% until 3.5%). While for fish distribution, Oreochromis niloticus was the dominant fish species from the others seven species found in the constructed wetland. Overall, the results from this study demonstrate that constructed wetlands significantly improve water quality of stormwater runoff, and that they are a good natural resource for the sustenance and maintenance of biodiversity.

关键词： constructed Wetland Water Quality Biodiversity Stormwater Runoff

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Enhanced nitrogen removal and microbial analysis in partially saturated constructed wetland for treating anaerobically digested swine waste water

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Frontiers of Environmental Science & Engineering 2019年第4期13卷 57-67页

作者： Zhenfeng Han Ying Miao Jing Dong Zhiqiang Shen Yuexi Zhou Shan Liu Chunping Yang State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University)Ministry of EducationChangsha 410082China College of Environmental Science and Engineering Chang5an UniversityXi'an 710061China Beijing Municipal Research Institute of Environmental Protection Beijing 100037China

Nitrogen removal of wastewater containing high-strength ammonium by the constructed wetlands (CWs) has been paid much attention. In this study, the ability of a partially saturated CW to treat anaerobically-digested decentralized swine wastewater under varying operating parameters from summer to winter was investigated. The partially saturated CW achieved better NH4^+-N and TN removal by tidal flow than intermittent flow. With surface loading rates of 0.108, 0.027, and 0.029 kg/(m^2·d) for COD, NH4^+-N, and TN, the partially saturated CW by tidal operation achieved corresponding removal efficiencies of 85.94%, 61.20%, and 57.41%, respectively, even at 10℃. When the rapid-adsorption of NH4^+-N and the bioregeneration of zeolites reached dynamically stable, the simultaneous nitrification and denitrification in the aerobic zeolite layer was observed and accounted for 58.82% of the total denitrification of CW. The results of Illumina high-throughput sequencing also indicated that nitnfiers (Nitrospira and Rhizomicrobiurri) and denitrifiers (Rhodanobacter and Thauera) simultaneously existed in the zeolite layer. The dominant existence of versatile organic degraders and nitrifiers/denitrifiers in the zeolite layer was related to the removal of most COD and nitrogen in this zone. The contribution of the possible nitrogen removal pathways in the CW was as follows: nitrification-denitrification (86.55%)>substrate adsorption (11.70%)>plant uptake (1.15%)>microbial assimilation (0.60%).

关键词： constructed wetland Decentralized swine wastewater Biozeolite Simultaneous nitrification and denitrification Nitrogen removal pathway

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A Review on constructed Wetlands Components and Heavy Metal Removal from Wastewater

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Journal of Environmental Protection 2015年第7期6卷 710-718页

作者： Ahmad Qasaimeh Hesham AlSharie Talal Masoud Civil Engineering Department Jadara University Irbid Jordan Civil Engineering Department Jerash University Jerash Jordan

constructed wetlands are man-made complex of substrates, emergent/submergent vegetation, and water. constructed wetlands have been known as an efficient and low-cost treatment process. constructed wetland is a natural treatment system that physical, chemical, and biological processes occur when water, soil, plants, and microorganisms interact. They are considered as natural treatment ecosystems that are designed to take advantages of the natural processes to provide wastewater treatment. constructed wetlands treat different types of wastewaters such as municipal, industrial, agricultural, and storm water. The removal of heavy metals within wetlands is performed generally by plant uptake and by adsorption onto sediments. Heavy metal treatment examples and some specifications and regulations are finally discussed.

关键词： constructed Wetlands Wastewater Heavy Metals

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