不同污泥浓度下MFC去除有机物及产电性能的实验研究
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摘要
采用3个相同的H型微生物燃料电池反应器,阳极室进水COD浓度为2 197～2 450mg·L~(-1),阴极室采用铁氰化钾溶液作为电子受体,研究不同污泥浓度(MLSS)下微生物燃料电池(Microbial Fuel Cell,MFC)去除有机物和产电性能.结果表明:阳极室平均污泥浓度(MLSS)分别为2 530mg·L~(-1)、5 183mg·L~(-1)和10 200mg·L~(-1)时,MFC对有机物均能较好的去除.污泥浓度的增加,有利于阳极生物膜的形成和系统的启动.然而,并非污泥浓度越大,MFC去除有机物及产电能力越大.随着污泥浓度的增加,有机物的去除率先增大后减小,而系统的内阻先减小后增大,导致输出电压以及功率密度均先增加后减少.在阳极室平均污泥浓度为5 183 mg·L~(-1)时,MFC对于有机物的去除效果最高,达到85%,输出电压高达0.78V,表观内阻为344.4Ω,功率密度为421.9mW·m~(-3),充放电性能较好,说明适宜的污泥浓度有利于MFC对有机物的去除和产电.研究结果对于改善MFC的处理效率和产电性能提供理论基础和运行方法.
Three identical H-type microbial fuel cell reactors were used to study the removal of organic pollutant and electricity generation performance by microbial fuel cells(MFC)under different sludge concentrations.The results showed that when the average sludge concentration(MLSS)of anode chamber is 2 530 mg·L~(-1),5 183 mg·L~(-1) and 10 200 mg·L~(-1),MFC can remove organics well.The increase of sludge concentration is beneficial to the formation of anode biofilm and the start-up of the system.However,it is not that the higher the sludge concentration,the greater the MFC's ability to remove organic pollutant and generate electricity.With the increase of sludge concentration,the removal of organic matter increases first and then decreases,while the internal resistance of the system decreases first and then increases,leading to the decrease of output voltage and power density.At the anode sludge concentration for an average of 5 183 mg·L~(-1),effect of MFC on removal of organic pollutant,the highest reached 85%,the output voltage of 0.78 V,the apparent resistance is low,344.4Ω,power density of 421.9 mW·m-3,charge and discharge performance is better.It indicates that the suitable activated sludge concentration is favorable for the removal of organics and electricity generation of MFC.The results provide a theoretical basis and operational method for improving MFC processing efficiency and electricity performance.
Three identical H-type microbial fuel cell reactors were used to study the removal of organic pollutant and electricity generation performance by microbial fuel cells(MFC)under different sludge concentrations.The results showed that when the average sludge concentration(MLSS)of anode chamber is 2 530 mg·L~(-1),5 183 mg·L~(-1) and 10 200 mg·L~(-1),MFC can remove organics well.The increase of sludge concentration is beneficial to the formation of anode biofilm and the start-up of the system.However,it is not that the higher the sludge concentration,the greater the MFC's ability to remove organic pollutant and generate electricity.With the increase of sludge concentration,the removal of organic matter increases first and then decreases,while the internal resistance of the system decreases first and then increases,leading to the decrease of output voltage and power density.At the anode sludge concentration for an average of 5 183 mg·L~(-1),effect of MFC on removal of organic pollutant,the highest reached 85%,the output voltage of 0.78 V,the apparent resistance is low,344.4Ω,power density of 421.9 mW·m-3,charge and discharge performance is better.It indicates that the suitable activated sludge concentration is favorable for the removal of organics and electricity generation of MFC.The results provide a theoretical basis and operational method for improving MFC processing efficiency and electricity performance.
引文
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[2]Logen B E.Simultaneous wastewater treatment and biological electricity generation[J].Water Science and Technology,2005,52(1-2):31-37.
[3]Quan X C,Quan Y P,Kun T.Comparative investigation on microbial community and electricity generation in aerobic and anaerobic enriched MFCs[J].Bioresource Technology,2013,128:259-265.
[4]Fan M Z,Liang P,Cao X X,et al.Effect of the initial anode potential on electricity generation in microbial fuel cell[J].Environmental Science,2008,29(1):263-267.
[5]Liu Y,Song P,Gai R,et al.Recovering platinum from wastewater by charring biofilm of microbial fuel cells(MFCs)[J].Journal of Saudi Chemical Society,2018 8:1-8.
[6]王维大.微生物燃料电池的应用进展研究[J].化工进展,2014,33(5):1 067-1 750.
[7]Baskurt E,Ekiz F,Demirkol D O,et al.A conducting polymer with benzothiadiazole unit:Cell based biosensing applications and adhesion properties[J].Colloids and Surfaces B:Biointerfaces,2012,97:13-18.
[8]Jessica K,Souren S,Sky M.Microbial fuel cell biofilm characterization with thermogravimetric analysis on bare and polyethyleneimine surface modified carbon foam anodes[J].Journal of Power Sources,2012,210:122-128.
[9]Rezaei F,Xing D,Wagner R,et al.Simultaneous cellulose degradation and electricity production by enterobacter cloacae in a microbial fuel cell[J].Appl Environ Microbiol,2009,75(11):3 673-3 678.
[10]易丹,陶虎村,李兆飞,等.双室微生物燃料电池利用乙酸钠和淀粉产电研究[J].环境科学研究,2008,21(3):141-145.
[11]Mccarty P L,Bae J,Kim J.Domestic wastewater treatment as a net energy producer-can this be achieved[J].Environmental Science&Technology,2011,45(17):7 100-7 106.
[12]Min B.Electricity generation from swine wastewater using microbial fuel cells[J].Water Res,2005,39(20):4 961-4 968.
[13]Zhuang L Y,Wang Y.Long-term evaluation of a 10-liter serpentine-type microbial fuel cell stack treating brewery wastewater[J].Bioresource Technology,2012,123(4):406-412.
[14]Rabaey,Korneel,Verstrate,et al.Microbial fuel cells:Novel biotechnology for energy generation[J].Trends in Biotechnology,2005,23(6):291-298.
[15]蒋青青,张璐,孙睿,等.不同污泥接种物对微生物燃料电池菌群形成的影响[J].哈尔滨工业大学学报,2018,50(2):34-39.
[16]操家顺,贺含悦,李超.不同方式预处理污泥对微生物燃料电池的影响[J].环境科学研究,2018,31(8):1 389-1 398.
[17]杨赛风,张建民,崔心水,等.微生物燃料电池阳极氨氮去除的影响因素[J].西安工程大学学报,2016,30(3):284-289.
[18]Wu X,O Modin.Ammonium recovery from reject water combined with hydrogen production in a bioelectrochemical reactor[J].Bioresour Technol,2013,146:530-536.
[19]梁鹏,范明志,曹效鑫.微生物燃料电池表观内阻的构成和测量[J].环境科学,2007,28(8):1 894-1 898.
[20]Katja F,Falk H,Uwe S.On the use of cyclic voltammetry for the study of anodic electron transfer in microbial fuel cells[J].Energy&Environmental Science,2008,1:144-147.
[21]刘志丹,连静,杜竹玮,等.利用异化金属还原菌构建含糖微生物燃料电池[J].生物工程学报,2006,22(1):131-137.
[22]Kawasaki K,Maruoka S,Katagami R,et al.Effect of intial MLSS,on operation of submerged membrane activated sludge process[J].Desalination,2011,28(20):334-339.
[23]Yu Y Y,Zhai D D,Si R W,et al.Three-dimensional electrodes for high-performance bioelectrochemical systems[J].Intern J Mal Sci,2017,18(1):90.
[24]卢洪斌,王春荣.不同条件对微生物燃料电池的启动时间及性能的影响[J].环保科技,2017,23(6):21-24.
[25]Heinze J.Cyclovoltammetrie-die"Spektroskopie"des elektrochemikers[J].Angewandte Chemie,1984,96:823-840.
[26]Rabaey K,Boon N,Siciliano S D,et al.Biofuel cells select for microbial consortia that self-mediate electron transfer[J].Applied&Environmental Microbiology,2004,70(9):5 373-5 382.
[27]Elmekawy A,Hegab H M,Dominguezbenetton X,et al.Internal resistance of microfluidic microbial fuel cell:Challenges and potential opportunities[J].Bioresource Technology,2013,142:672-682.
[28]莫志军,胡林会,朱新坚.燃料电池表观内阻的在线测量[J].电源技术,2005,29(2):95-98.
[29]郭璇,詹亚力,郭绍辉.炼油废水微生物燃料电池启动及影响因素[J].环境工程学报,2013,7(6):2 100-2 104.