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Journal of Environmental Sciences 2020年第1期32卷 260-271页

作者： Changtao Yang Jing Nan Huaiyong Yu Jianhua Li College of Environmental Science and Engineering Tongji University

An embedded reservoir that provides an efficient nutrient removal system protects drinking ***,embedded reservoirs are rarely used in eutrophic shallow lakes because of their undetermined nutrient retention efficiency and unknown effects by the phytoplankton *** this study,we aim to investigate the nutrient retention and algae succession in an embedded reservoir and adjacent wetland from April 2017 to September 2018 in the eastern part of Lake Taihu,*** than 40%of total phosphorus(TP)and 45%of particulate phosphorous entering the reservoir were retained semiannually,and the highest TP removal efficiency was achieved in the reservoir during autumn with an average value of 53.3%±9.9%.The overall nitrogen retention efficiency(21.7%±37.8%)was lower than that of TP(41.8%±27.8%).Similar trends were obtained in the wetland *** important pathway for phosphorus removal is through particulate matter *** study revealed that nutrient retention mechanisms in the reservoir were primarily via macrophyte absorption,particulate substance sedimentation,and prolonged water residence ***,the phytoplankton biomass(Chl-a)in the reservoir decreased(from 48.0 to 25.2μg/L)and water transparency improved,due to the decreased P level and transformation of the phytoplankton group into simple structures with good ecological ***,the combination of embedded reservoir and constructed wetland ecosystem can be used successfully to protect surface *** results will be advantageous to groups seeking to preserve drinking water sources.

关键词： Drinking water source Eutrophication Embedded reservoir constructed wetland Nutrient retention Phytoplankton succession

Modeling the effects of constructed wetland on nonpoint source pollution control and reservoir water quality improvement

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Journal of Environmental Sciences 2010年第6期22卷 834-839页

作者： Jonghwa Ham Chun G.Yoon Hyung-Joong Kim Hyung-Chul Kim Rural Research Institute of KRC Environmental Science Department Konkuk University

This article describes the integrated modeling approach for planning the size and the operation of constructed wetlands for maximizing retention of nonpoint source pollutant loads and reservoir water-quality improvement at a catchment scale. The experimental field-scale wetland systems （four sets, 0.88 ha each） have been in operation since 2002, where water depth was maintained at 30-50 cm and hydraulic loading rate was at 6.3-18.8 cm/day. The wetland system was found to be adequate for treating polluted stream water with stable removal efficiency even during the winter. The integrated modeling system （modified-BASINS） was applied to the Seokmoon estuarine reservoir watershed and calibrated with monitoring data from constructed wetland, stream, and reservoir. The calibrated integrated modeling system estimated that constructing wetlands on 0.5% （about 114 ha） of the watershed area at the mouth of reservoir could reduce 11.61% and 13.49% of total external nitrogen and phosphorus loads, respectively. It also might improve the nitrogen and phosphorus concentration of the reservoir by 9.69% and 16.48%, respectively. The study suggested that about 0.1%-1.0% of the watershed area should be allocated for constructed wetland to meet specified water-quality standards for the estuarine reservoir at the polder area where land use planning is relatively less complicated.

关键词： constructed wetland estuarine reservoir integrated modeling system nonpoint source pollution control polder area water quality improvement

Effect of wetland plant fermentation broth on nitrogen removal and bioenergy generation in constructed wetland-microbial fuel cells

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 89-100页

作者： Yiting Chen Jun Yan Mengli Chen Fucheng Guo Tao Liu Yi Chen Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment(Ministry of Education) Chongqing UniversityChongqing400045China College of Environment and Ecology Chongqing UniversityChongqing400045China

constructed wetlands(CWs)are widely used as a tertiary treatment technology,and the addition of carbon sources can significantly improve advanced nitrogen ***,excessive carbon sources would lead to an increase in the effluent chemical oxygen demand in CWs,and microbial fuel cells(MFCs)can convert these into *** this study,constructed wetland-microbial fuel cells(CW-MFCs)were built to achieve simultaneous nitrogen removal and electricity generation,using wetland plant litter fermentation broths as carbon *** total nitrogen removal in the groups with fermentation broth addition(FGs)reached 83.33%,which was 19.64%higher than that in the CG(group without fermentation broth),and the mean voltages in the FGs were at least 2.6 times higher than that of the ***,two main components of the fermentation broths,acetic acid(Ac)and humic acid(HA),were identified using a three-dimensional excitation emission matrix and gas chromatograph and added to CW-MFCs to explore the influence mechanism on the treatment *** and electrogenesis presented the same tendency:Ac&HA>Ac>CG’(groups without Ac and HA).These results indicate that Ac and HA increased the abundance of functional genes associated with nitrogen metabolism and electron *** study demonstrated that CW-MFC fermentation broth addition can be a potential strategy for the disposal of secondary effluent and bioelectricity generation.

关键词： constructed wetland Microbial fuel cell Nitrogen removal Bioenergy generation Carbon source

Greenhouse gas emissions from a constructed wetland for municipal sewage treatment

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Journal of Environmental Sciences 2002年第1期14卷 27-33页

作者： TAI Pei dong 1, LI Pei jun 1 , SUN Tie heng 1, HE Yao wu 1, ZHOU Qi xing 1 GONG Zong qiang 1, Motoyuki Mizuochi 2, Yuhei Inamori 2 (1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110015, China. 2 National Insti Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110015 Chin

The fluxes of greenhouse gases (methane and nitrous oxide) emission from a constructed wetland in the Eastern China as municipal sewage treatment were measured from June 1999 to August 2000 by the closed chamber method. The constructed wetland for municipal sewage treatment is a significant source of methane, up to 976 6×10 6 g CH 4/a, which was emitted from the constructed wetland with the area of 495000 m 2 and wastewater loading rate of 12000 m 3/d. Its daily mean methane flux reached 5 22 g CH 4/(m 2·d), 250 times as much as that in natural wetland in the same latitude region. 227 8 mg CH 4 was produced from the treatment of 1 liter wastewater, up to 700—1000 times as much as that in the secondary treatment. The emission of nitrous oxide from the constructed wetland is not higher than that from secondary treatment of wastewater, only 0 07 mgN 2O/L.

关键词： greenhouse gas emission constructed wetland municipal sewage methane nitrous oxide

Removal of arsenic by pilot-scale vertical flow constructed wetland

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 351-363页

作者： Yaocheng Fan Tiancui Li Deshou Cun Haibing Tang Yanran Dai Feihua Wang Wei Liang State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan430072China University of Chinese Academy of Sciences Beijing100049China

Four pilot-scale Vertical Flow constructed wetlands(VFCWs)filled with gravel and planted with Phragmites australis were operated for seven months in the field to study the efficiency of arsenic removal in contaminated *** average arsenic removal efficiency by the VFCWs was 52.0%±20.2%,52.9%±21.3%,and 40.3%±19.4%at the theoretical concentrations of 50µg/L(CW50),100µg/L(CW100),and 500µg/L(CW500)arsenic in the wastewater,*** results also showed no significant differences in the removal efficiency for conventional contaminants(nitrogen,phosphorus,or chemical oxygen demand)between wastewater treatments that did or did not contain arsenic(P>0.05),except for phosphorus in *** highest average monthly removal rate of arsenic occurred in August(55.9%–74.5%)and the lowest in November(7.8%–15.5%).The arsenic removal efficiency of each VFCW was positively correlated with temperature(P<0.05).Arsenic accumulated in both substrates and plants,with greater accumulation associated with increased arsenic concentrations in the *** maximum accumulated arsenic concentrations in the substrates and plants at the end of the experiment were 4.47 mg/kg and 281.9 mg/kg,respectively,both present in *** translocation factor(TF)of arsenic in the reeds was less than 1,with most of the arsenic accumulating in the *** arsenic mass balance indicated that substrate accumulation contributed most to arsenic removal(19.9%–30.4%),with lower levels in plants(3.8%–9.5%).In summary,VFCWs are effective for the treatment of arsenic-containing wastewater.

关键词： constructed wetland Arsenic Removal efficiency Mass balance

Comparative study of microbial community structure in different filter media of constructed wetland

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Journal of Environmental Sciences 2010年第1期22卷 127-133页

作者： Ming Li Qiaohong Zhou Min Tao Ying Wang Lijuan Jiang Zhenbin Wu State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Graduate University of Chinese Academy of Sciences Beijing 100039 China School of Resource & Environmental Engineering Wuhan University of Technology Wuhan 430070 China

Comparisons of microbial community structure, in eight filter media of zeolites, anthracite, shale, vermiculite, ceramic filter media, gravel, steel slag and bio-ceramic, were undertaken by analyzing the phospholipid fatty acid （PLFA） composition. A total of 20 fatty acids in the range of C18to C20 were determined but only 13 PLFAs were detected in steel slag. They consist of saturated fatty acids, branched fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids. The variation of fatty acids was revealed in the relative proportions of these fatty acids in different media. The aerobic prokaryotes were the predominant group in all media. The PLFA composition showed significant differences among the eight different media by Tukey＇s honestly test. It was found that steel slag was significantly different in the microbial community as compared to other filter media, probably due to its alkaline effluent. Steel slag alone is probably not a good choice of substratum in constructed wetlands. The principle components analysis （PCA） showed that zeolites, bio-ceramic, shale and vermiculite had a similar microbial community structure while steel slag and ceramic filter media were distinct from other media.

关键词： microbial community structure phospholipid filter media biomarkers constructed wetland steel slag

Influence of modified biochar supported sulfidation of nano-zero-valent-iron(S-nZVI/BC) on nitrate removal and greenhouse gas emission in constructed wetland

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Journal of Environmental Sciences 2023年第3期125卷 568-581页

作者： Fanlong Kong Junru Wang Weihao Hou Yuqian Cui Lihua Yu Yi Zhang Sen Wang College of Environmental Science and Engineering Qingdao UniversityQingdao 266071China Qingdao Environmental Protection Bureau Laixi BranchQingdao 266699China

In this study,the biochar (BC) produced from sawdust,sludge,reed and walnut were used to support sulfidation of nano-zero-valent-iron (S-nZVI) to enhance nitrate NO_(3)^(-) removal and investigate the impact on greenhouse gas *** experiment results showed the S-nZVI/BC(sawdust (2:1,500)),S-n ZVI/BC(sludge (2:1,900)),S-n ZVI/BC(reed (2:1,700)),and S-n ZVI/BC(walnut (2:1,700))respectively improved NO_(3)^(-) removal efficiencies by 22%,20%,3%and0.1%,and the selectivity toward N_(2)by 22%,25%,22%and 18%.S-nZVI uniformly loaded on BC provided electrons for the conversion of NO_(3)^(-) to N_(2)through *** the same time,FeSxlayer was formed on the outer layer of ZVI in the sulfidation process to prevent iron oxidation,so as to improve the electrons utilization efficiency After adding four kinds of S-nZVI/BC into constructed wetlands (CWs),the NO_(3)^(-) removal efficiencies could reach 100%and the N_(2)O emission fluxes were reduced by 24.17%-36.63%.And the average removal efficiencies of TN,COD,TP were increased by 21.9%,-16.5%,44.3%,*** increasing relative abundances of denitrifying bacteria,such as Comamonas and Simplicispira,suggested that S-nZVI/BC could also improve the process of microbial *** addition,different S-nZVI/BC had different effects on denitrification functional genes (narG,nirk,nirS and nos Z genes),methanotrophs (pmoA) and methanogenesis (mcrA).This research provided an effective method to improve NO_(3)^(-) removal and reduce N_(2)O emission in CWs.

关键词： Sulfidation of nano-zero-valent-iron Biochar Nitrate removal Greenhouse gas constructed wetland

Sulfur cycle as an nitrate in a electron mediator between carbon and constructed wetland microcosm

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 17-29页

作者： Wenrui Guo Yue Wen Yi Chen Qi Zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of the Three Gorges Region's Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China

A constructed wetland microcosm was employed to investigate the sulfur cycle-mediated electron transfer between carbon and *** accepted electrons from organics at the average rate of 0.84 mol/(m3·d)through sulfate reduction,which accounted for 20.0%of the electron input *** remainder of the electrons derived from organics were accepted by dissolved oxygen(2.6%),nitrate(26.8%),and iron(III)(39.9%).The sulfide produced from sulfate reduction was transformed into acidvolatile sulfide,pyrite,and elemental sulfur,which were deposited in the substratum,storing electrons in the microcosm at the average rate of 0.52 mol/(m3·d).In the presence of nitrate,the acid-volatile and elemental sulfur were oxidized to sulfate,donating electrons at the average rate of 0.14 mol/(m3•d)and driving autotrophic denitrification at the average rate of 0.30 g N/(m3·d).The overall electron transfer efficiency of the sulfur cycle for autotrophic denitrification was 15.3%.A mass balance assessment indicated that approximately 50%of the input sulfur was discharged from the microcosm,and the remainder was removed through deposition(49%)and plant uptake(1%).Dominant sulfatereducing(i.e.,Desulfovirga,Desulforhopalus,Desulfatitalea,and Desulfatirhabdium)and sulfuroxidizing bacteria(i.e.,Thiohalobacter,Thiobacillus,Sulfuritalea,and Sulfurisoma),which jointly flilfilled a sustainable sulfur cycle,were *** results improved understanding of electron transfers among carbon,nitrogen,and sulfur cycles in constructed wetlands,and are of engineering significance.

关键词： constructed wetland Sulfur cycle Electron transfer Denitrification

Enhancing treatment efficiency of swine wastewater by effluent recirculation in vertical-flow constructed wetland

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Journal of Environmental Sciences 2006年第2期18卷 221-226页

作者： HE Lian-sheng LIU Hong-liang XI Bei-dou ZHU Ying-bo Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Chinese Research Academy of Environmental Sciences Beijing 100012 China Institute of Geographical Science and Natural Resource Research Chinese Academy of Sciences Beijing 100101 China

Livestock wastewater has been a major contributor to Chinese cultural eutrophication of surface waters. constructed wetlands are under study as a best management practice to treat wastewater from dairy and swine operations, but the removal efficiency of pollutants is relatively low. Enhancing the treatment efficiency of livestock wastewater by effluent recirculation was investigated in a pilot-scale vertical-flow constructed wetland. The wetland system was composed of downflow and upflow stages, on which narrow-leaf Phragmites communis and common reed Phragraites Typhia are planted, respectively; each stage has a dimension of 4 m^2 （2 m × 2 m）. Wastewater from facultative pond was fed into the system intermittently at a flow rate of 0.4 m^3/d. Recirculation rates of 0, 25%, 50%, 100% and 150% were adopted to evaluate the effect of the recirculation rate on pollutants removal. It shows that with effluent recirculation the average removal efficiencies of NH4-N, biological oxygen demand （BOD5） and suspended solids（SS） obviously increase to 61.7%, 81.3%, and 77.1%, respectively, in comparison with the values of 35.6%, 50.2%, and 49.3% without effluent recirculation. But the improvement of TP removal is slight, only from 42.3% to 48.9%. The variations of NH4-N, dissolved oxygen（DO） and oxidation-reduction potential（ORP） of inflow and outflow reveal that the adoption of effluent recirculation is benefi- cial to the formation of oxide environment in wetland. The exponential relationships with excellent correlation coefficients （R2 〉0.93） are found between the removal rates of NH4-N and BOD5 and the recirculation rates. With recirculation the pH value of the outflow decreases as the alkalinity is consumed by gradually enhanced nitrification process. When recirculation rate is kept constant 100%, the ambient temperature appears to affect NH4-N removal, but does not have significant influence on BOD5 removal.

关键词： vertical-flow constructed wetland swine wastewater effluent recirculation recirculation rate nitrification

Degradation of dissolved organic matter in effluent of municipal wastewater plant by a combined tidal and subsurface flow constructed wetland

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Journal of Environmental Sciences 2021年第8期33卷 171-181页

作者： Chunjian Lyu Ruixia Liu Xiaojie Li Yonghui Song Hongjie Gao Basin Research Center for Water Pollution Control Chinese Research Academy of Environmental SciencesBeijing 100012China College of Water Sciences Beijing Normal UniversityBeijing 100875China

Dissolved organic matter(DOM)is an important constituent of wastewater treatment plant(WWTP)effluent.A novel combined tidal and subsurface flow constructed wetland(TF-SSFCW)of 90 L was constructed for a ten-month trial of advanced treatment of the WWTP *** emission matrix(EEM)fluorescence spectroscopy,parallel factor(PARAFAC)analysis and a two end-member mixing model were employed to characterize the composition and removal process of the effluent DOM(EfOM)from the *** results showed that the TF-SSF-CW performed an efficient EfOM removal with dissolved organic carbon(DOC)removal rate of 88%and dissolved organic nitrogen(DON)removal rate of 91%.Further analysis demonstrated that the EfOM consisted mainly of two protein moieties and two humic-like groups;protein moieties(76%)constituted the main content of EfOM in raw water and humic-like groups(57%)became the dominating contributor after *** EfOM from the WWTP was mainly of aquatic bacterial origin and evolved to a higher proportion of terrigenous origin with higher humification in the TF-SSF-CW effluent.A common controlling treatment-related factor for determining the concentrations of the same kind of substances(protein groups or humic-like groups)was revealed to exist,and the ratio of removal rates between the same substances in treatment was *** study demonstrates that the TF-SSF-CW can be a novel and effective treatment method for the EfOM from WWTPs,and is helpful for understanding of the character of EfOM in wetland treatment.

关键词： constructed wetland Effluent organic matter Excitation emission matrices PARAFAC analysis