MFC处理人工湿地生物堵塞物及同步产电研究  

MFC Treating Bio-Clogging Matter of Constructed Wetland and Synchronous Electricity Generation

作　　者：林莉莉[1,2] 鲁汭 龙忆年 陈宇华 肖恩荣 吴振斌[2] LIN Lili;LU Rui;LONG Yinian;CHEN Yuhua;XIAO Enrong;WU Zhenbin(School of Resource&Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan 430072,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]中国科学院水生生物研究所,淡水生态和生物技术国家重点实验室,湖北武汉430072 [3]中国科学院大学,北京100049

出　　处：《环境科学研究》2020年第6期1504-1513,共10页Research of Environmental Sciences

基　　金：中国科学院科技服务网络计划(No.KFJ-STS-ZDTP-038);中交第二公路勘察设计研究院有限公司科技研发项目(No.KJFZ-2018-046-001);中央高校基本科研业务费资助(No.195208006)。

摘　　要：为探究MFC(microbial fuel cells,微生物燃料电池)对人工湿地(constructed wetland,CW)堵塞物EPS(extracellular polymeric substances,胞外聚合物)组分的处理效果和产电性能,构建双室MFC,设置闭路组(closed circuit MFC,MFC-C)和开路组(open circuit MFC,MFC-O)对EPS中的主要组分〔PN(protein,蛋白质)和PS(polysaccharide,多糖)〕及人工湿地堵塞物进行处理,分析底物类型、底物浓度和外阻(R ex)对MFC系统产电性能的影响及系统对底物的处理效果.结果表明:①MFC系统的产电性能受底物类型、底物浓度及R ex的影响较大,底物浓度增加1.5倍(由200 mg/L增至500 mg/L)时,MFC系统最大电压(V max)增加5.8%(PN),最大功率密度(P max)分别增加188.30%(PN)和124.21%(PS);保持底物类型和底物浓度不变,R ex增加9倍(由100Ω增至1000Ω)时,MFC的V max分别增加110.26%(PN)和92.81%(PS),P max分别增加109.19%(PN)和7.51%(PS).②PN可全部被阳极微生物利用,但同时阳极微生物会分泌PS,底物浓度增加1.5倍时,出水中ρ(PS)分别增加107.85%(MFC-C)和78.55%(MFC-O);R ex增加9倍时,ρ(PS)分别增加415.85%(MFC-C)和294.29%(MFC-O);底物为PN时,出水中ρ(PS)均表现为MFC-C<MFC-O,说明MFC形成的微弱电场在一定程度上可抑制PS的分泌.③人工湿地堵塞物可作为MFC的底物,随着投加量的增加(除堵塞物投加量为0.500 g/L外),V max(约750 mV)变化不大,但电压稳定时间随投加量的增加而略有延长;堵塞物投加量为6.667 g/L时,MFC的P max为12.25 mW/m^2,内阻(R int)为1112.5Ω,MFC产电性能下降.研究显示,人工湿地堵塞物EPS可以作为MFC的阳极底物并同步实现能源回收.In order to investigate the performance of MFC(microbial fuel cell)treating extracellular polymeric substances(EPS)as the main components of bio-clogging matter from constructed wetland(CW),a two-chambered MFC was used in this study to degrade the synthetic EPS including protein(PN)and polysaccharide(PS)and the actual bio-clogging matter from CW.The electricity generation performance and the treatment efficiency were evaluated under different substrate types,substrate concentrations and external resistance(R ex).Two experimental groups,including closed circuit MFC(MFC-C)and open circuit MFC(MFC-O),were set up to compare the differences.The results showed that MFC had the potential to alleviate the bio-clogging in constructed wetlands and to generate electricity synchronously.Firstly,the electricity generation performance of MFC-C system was significantly affected by substrate type,substrate concentration and R ex.When the substrate concentration increased by 1.5 times(from 200 mg/L to 500 mg/L),the maximum output voltage(V max)was increased by 5.8%(PN),the maximum power density(P max)was increased by 188.30%(PN)and 124.21%(PS)respectively.When the R ex increased by 9 times(from 100Ωto 1000Ω)with substrate type and substrate concentration unchanged,the V max was increased by 110.26%(PN)and 92.81%(PS)respectively,and the P max was increased by 109.19%(PN)and 7.51%(PS)respectively.Secondly,the anode microorganisms fully utilized PN but simultaneously secreted PS.When the substrate concentration increased by 1.5 times,the PS secreted by the microorganisms(ρ(PS))was increased by 107.85%(MFC-C)and 78.55%(MFC-O)respectively.When the R ex increased by 9 times,theρ(PS)was increased by 415.85%(MFC-C)and 294.29%(MFC-O)respectively.Theρ(PS)in the effluent of MFC-C was less than that of MFC-O,which indicated that the weak electric field formed by MFC inhibited the secretion of PS to some extent.Thirdly,MFC could use clogging matter from CW as a substrate and strengthen the removal of aromatic protein and soluble microbia

关 键 词：微生物燃料电池 胞外聚合物 人工湿地 生物堵塞 产电 

分 类 号：X703[环境科学与工程—环境工程]