脱氮副球菌YF1微生物燃料电池生物阴极脱氮和产电

Denitrification and electrogenesis in cathode of microbial fuel cells by Parococcus sp. strain YF1

以脱氮副球菌YF1构建纯种生物阴极微生物燃料电池(microbial fuel cell,MFC)进行脱氮和产电机理的研究。研究结果发现,阴极碳氮比、pH值对产电和脱氮效率有明显影响。当MFC的阴极运行条件pH值为8.0,碳氮比为20时,运行时间15 h时,脱氮率高达100%,输出电压为150 mV。上述结果表明,微生物燃料电池运行过程中,细菌降解硝酸根的机理为将硝酸根还原为N2或者直接将其作为自身的营养物质而利用。循环伏安(CV)与扫描电镜(SEM)的结果表明,在微生物燃料电池运行中,副球菌YF1通过接触导电作为产电的电子供体。

In this study,Parococcus sp. strain YF1 was used to remove nitrate and to generate electricity in the cathode of microbial fuel cells( MFC). Results showed that the carbon-nitrogen ratio and initial pH in the cathode have great effect on the electricity generation and removal of nitrate. 150 mV of electricity was generated and 100% nitrate was removed after biodegradation for 15 h at pH 8. 0 and C /N 20. Based above,it is indicated that the degradation mechanism of nitrate from wastewater by Parococcus sp. strain YF1 could be through reduction to nitrogen or being used directely as the nutrient reqired for producing electricity. In addition,scanning electron microscope(SEM) and cyclic voltammetry(CV) analysis showed Parococcus sp. strain YF1 was act as electron donors for power generation by direct contact in the MFC.