缓冲液对微生物燃料电池产电性能影响研究  

Influence of Buffer Solutions on the Performance of Microbial Fuel Cell Electricity Generation

作　　者：强琳[1] 袁林江[2] 丁擎[2] 

机构地区：[1]宝鸡市环境保护监测站,宝鸡721006 [2]西安建筑科技大学西北水资源与环境生态教育部重点实验室,西安710055

出　　处：《环境科学》2011年第5期1524-1528,共5页Environmental Science

基　　金：教育部新世纪优秀人才支持计划项目(NCET-07-0659);教育部"长江学者与创新团队发展计划"创新团队项目(IRT0853)

摘　　要：微生物燃料电池(microbial fuel cell,MFC)应用于废水处理是一项非常有潜力的除污产能的绿色技术.但MFC运行过程中采用磷酸盐缓冲液不符合除污产能要求,增加水体富营养化趋势且增加水处理成本.试验采用单极室微生物燃料电池处理模拟生活污水,以投加PBS(phosphate buffer solution)缓冲液为参比对象,讨论了投加硼砂缓冲液和无缓冲液对产电功率、库仑效率以及出水pH的影响.200 mmol/L的PBS缓冲液电导率为1.973 mS/cm,最大输出功率为36.4 mW/m2,最大库仑效率为2.92%,出水pH为(7.00±0.05).100 mmol/L的硼砂缓冲液的导电率为1.553 mS/cm,输出功率最大26.2 mW/m2,库仑效率为6.26%,是PBS缓冲液库仑效率的2.14倍,显著地提高了电子回收率,出水pH为7.35.无缓冲液电导率为0.314 mS/cm,最大输出功率为27.64 mW/m2,库仑效率为2.82%,出水pH约为7.43.不投加缓冲液的电导率仅为投加PBS缓冲液的1/6,硼砂缓冲液的1/5,功率比PBS低8.76 mW/m2,比硼砂缓冲液高1.24 mW/m2.试验结果表明投加适宜浓度的硼砂缓冲液可大大提高电子回收率,不投加缓冲液MFC在间歇运行模式下可成功运行.Microbial fuel cell（MFC） is a potential green technology due to its application in wastewater treatment and renewable energy generation.Phosphate buffer solution（PBS） has been commonly used in MFC studies to maintain a suitable pH for electricity generating bacteria and/or to increase the solution conductivity.However,it has some drawbacks using PBS in MFC： One is that the addition of a high concentration of phosphate buffer in MFCs is expensive,especially for the application in wastewater treatment;the other is that phosphates can contribute to the eutrophication conditions of water bodies if the effluents are discharged without the removal of phosphates.By adding PBS buffer as the comparison,the study investigated the effect of borax buffer and in the absence of buffer on the performance of electrical power,coulomb efficiency and effluent pH.200 mmol/L PBS was the best,conductivity was 1.973 mS/cm,the maximum power density was 36.4 mW/m2 and the maximum coulomb efficiency was 2.92%,effluent pH was almost at（7.00 ± 0.05）.100mmol/L borax buffer solution,conductivity was 1.553 mS/cm;the maximum power density was 26.2 mW/m2,coulomb efficiency of 6.26%,which was 2.14 times to PBS and greatly increased the electron recovery efficiency with the effluent pH was（7.35 ± 0.05）.While free buffer solution conductivity was 0.314 mS/cm,maximum power density was 27.64 mW/m2;coulomb efficiency was 2.82% and the effluent pH of approximately 7.43.The electrolyte which in absence of buffer solution conductivity was 1/6 of adding PBS buffer,1/5 of borax buffer,while its power density lower 8.76 mW/m2 than adding PBS and higher 1.24 mW/m2 than borax buffer.The results showed that adding the suitable concentration of borax buffer may improve the electron recovery efficiency and under batch conditions,MFC run successfully without adding buffer solution to MFC.

关 键 词：微生物燃料电池 缓冲液 产电功率 库仑效率 电导率 

分 类 号：X382[环境科学与工程—环境工程]