小球藻生物阴极MFC处理养猪废水及产电性能

针对规模化养猪场废水特点和目前处理技术存在的问题,构建了小球藻生物阴极微生物燃料电池(MFC),探索利用MFC同步处理养猪场废水及回收电能的可行性。当阳极底物COD由510 mg/L增加至4 250 mg/L时,电池的最大输出电压由279. 16 mV提高到501. 16 mV,最大功率密度从271. 15 mW/m3提高到907. 52 mW/m3,对应的内阻由795. 93 1降至256.7 Q;随着阳极底物COD浓度的增加,MFC阳极中COD去除率逐渐提高,并在COD为4 250 mg/L时达到最大,为9& 29%。然而,电池库仑效率却由5. 97%降至2. 86%,且NH;- N和TP的去除率也呈下降趋势。结合产电性能、污染物降解能力以及库仑效率等方面进行分析评价,在阳极底物COD为950 mg/L'NH;-N约为55 mg/L、TP约为10 mg/L时,MFC的产电和有机物降解综合性能表现最佳。可见,小球藻生物阴极MFC可降解养猪场废水中的COD并利用污染物质产电。

Electricity Generation Performance and Treatment of Swine Wastewater by Chlorella Biocathode Microbial Fuel Cell

Based on the characteristics of large-scale swine wastewater and the problems existing in current treatment technologies,a Chlorella biocathode microbial fuel cell(MFC)was constructed to explore the feasibility of simultaneous treatment of swine wastewater and electric energy recovery.When the COD concentration of the anode substrate increased from 510 mg/L to 4 250 mg/L,the maximum output voltage and power density of MFC increased from 279.16 mV and 271.15 mW/m3 to 501.16 mV and 907.52 mW/m3 respectively,and the internal resistance of MFC decreased from 795.93 Q to 256.7 Q.With the increasing of COD concentration in anode,the removal efficiency of COD gradually increased and reached the maximum when the COD was 4 250 mg/L,which was 98.29%.However,the Coulombic efficiency of MFC decreased from 5.97%to 2.86%.The removal efficiency of NH4+一N and TP also showed a downward trend.Based on comprehensive evaluation of electricity generation performance,pollutant degradation ability and Coulombic efficiency,the Chlorella biocathode MFC had the best performance when the initial concentration of COD,NH;-N and TP was about 950 mg/L,55 mg/L and 10 mg/L in anode chamber.These results demonstrate that the Chlorella biocathode MFC can degrade COD in swine wastewater and produce electricity by using pollutants.