摘要
以黄姜废水为底物,采用单室型微生物燃料电池,验证了MFC处理黄姜废水的可行性,研究了进水COD和SO4^2-浓度对产电性能的影响.控制电导率和COD等条件一致,黄姜废水最大功率密度为葡萄糖配水的80.3%.低COD浓度条件下MFC产电稳定,功率密度随COD浓度上升而提高,最高为322 mW/m^2;当COD提高至2766 mg/L以上时,MFC稳定产电的时长缩短且更新基质后无法恢复最佳产电水平,表明过高的COD负荷会抑制产电微生物活性.COD最终去除率在68.2%～84.8%之间,且随着初始浓度的提高去除率有所下降.进水SO4^2-浓度的提高使MFC输出功率密度增大,但当SO4^2-浓度〉7 716 mg/L（电导率〉8.19 mS/cm）时,继续提高SO4^2-浓度无法使功率密度增大.与沉淀SO4^2-后的废水比较,含硫原水的最大功率密度平均下降14.5%,其库仑效率也随SO4^2-浓度提高明显下降,表明存在SO4^2-作为电子受体被还原,降低了MFC的效率.
The possibility of electricity generation in a single chamber microbial fuel cell fed with Dioscorea zingiberensis C.H.Wright wastewater was demonstrated,and the effects of COD and SO4^2- concentration on MFC performance were investigated.Under the same conductivity and COD concentration,the power density generated from wastewater equaled to 80.3% of that from glucose.At low COD concentration,the electricity generation increased with increasing COD loading rates,and the maximum power density was 322 mW/m^2;while the COD concentration was enhanced over 2766mg/L, the stable times for electricity generation was reduced and the MFC could not recover to previous performance as refueling.That indicates high COD loading rates would inhibit microbial activity.The COD removal rates varied from 68.2% to 84.8%,and it decreased when COD concentration climbed up.The power density was enhanced with SO4^2- concentration increasing up to 7716mg/L（Conductivity 〉 8.19（mS/cm）） after which no further improvements in power density were observed.The maximum power density of the wastewater containing SO4^2- was lower by 14.5% on average than that of the wastewater which removed SO4^2-.And its coulombic efficiencies declined substantially as SO4^2- concentration increasing,which imply that the SO4^2-is deoxidized as the electron acceptor,which takes the MFC efficiency down.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第10期3093-3098,共6页
Environmental Science
基金
“十一五”国家科技支撑计划项目(2006BAB04A14)
关键词
微生物燃料电池
黄姜
功率密度
内阻
SO4^2-
microbial fuel cell（ MFC）
Dioscorea zingiberensis C.H. Wright
power density
internal resistance
SO4^2-
