引用本文:林莉莉,鲁汭,龙忆年,等.MFC处理人工湿地生物堵塞物及同步产电研究[J].环境科学研究,2020,33(6):1504-1513.
LIN Lili,LU Rui,LONG Yinian,et al.MFC Treating Bio-Clogging Matter of Constructed Wetland and Synchronous Electricity Generation[J].Research of Environmental Sciences,2020,33(6):1504-1513.]
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MFC处理人工湿地生物堵塞物及同步产电研究
林莉莉1,2, 鲁汭2,3, 龙忆年2,3, 陈宇华2,3, 肖恩荣2, 吴振斌2
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
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(Rex)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Rex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(Vmax)增加5.8%(PN),最大功率密度(Pmax)分别增加188.30%(PN)和124.21%(PS);保持底物类型和底物浓度不变,Rex增加9倍(由100 Ω增至1 000 Ω)时,MFC的Vmax分别增加110.26%(PN)和92.81%(PS),Pmax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);Rex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-CVmax(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Pmax为12.25 mW/m2,内阻(Rint)为1 112.5 Ω,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.
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
DOI:10.13198/j.issn.1001-6929.2019.12.05
分类号:X703
基金项目: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)
MFC Treating Bio-Clogging Matter of Constructed Wetland and Synchronous Electricity Generation
LIN Lili1,2, LU Rui2,3, LONG Yinian2,3, CHEN Yuhua2,3, XIAO Enrong2, WU Zhenbin2
1. School of Resource & Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;2. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;3. University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
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 (Rex). 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 Rex. When the substrate concentration increased by 1.5 times (from 200 mg/L to 500 mg/L), the maximum output voltage (Vmax) was increased by 5.8% (PN), the maximum power density (Pmax) was increased by 188.30% (PN) and 124.21% (PS) respectively. When the Rex increased by 9 times (from 100 Ω to 1 000 Ω) with substrate type and substrate concentration unchanged, the Vmax was increased by 110.26% (PN) and 92.81% (PS) respectively, and the Pmax 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 Rex increased by 9 times, the ρ(PS) was increased by 415.85% (MFC-C) and 294.29% (MFC-O) respectively. The ρ(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 microbial products. With the increase of clogging matter dosage, except for 0.500 g/L, the Vmax(about 750 mV) remained stable and the stable time was slightly extended. When the amount was 6.667 g/L, the Pmax of MFC reached 12.25 mW/m2 and the internal resistance (Rint) was 1112.5 Ω. However, the electricity generation performance of MFC decreased dramatically. The results suggest that the EPS of clogging matter can be used as the substrate of MFC and achieve energy recovery synchronously.
Key words:  microbial fuel cell  extracellular polymeric substances  constructed wetland  bio-clogging  electricity generation