冻融处理对不同阴极构型MFC产电及有机物降解的影响

为了研究不同阴极构型的微生物燃料电池(MFC)处理剩余污泥时的产电以及有机物降解情况,构建了铁氰化钾双室MFC以及生物阴极双室MFC两套系统,分析了两套系统处理剩余污泥时电压、功率密度以及有机物变化及降解情况.结果表明,处理冻融污泥时,铁氰化钾双室MFC8h达到稳定电压0.726V,运行6d时SCOD达到峰值3771.4mg/L,此时最大功率密度最高为10.3W/m3,周期结束(20d)TCOD去除率为70.3%;生物阴极双室MFC运行3d达到稳定电压0.76V并持续22d后下降,15~20d时SCOD达到峰值4538.0mg/L,并获得最高的最大功率密度13.7W/m3,周期结束(30d)去除80.6%的TCOD.相对于铁氰化钾双室MFC,生物阴极双室MFC能够更为彻底的促进污泥有机物溶出并利用其产电,对溶解性碳水化合物利用以及有机物的降解得更为彻底,同时更利于MFC系统的长期稳定运行.

Effect of sludge freezing/thawing on electricity generation and organic degradation in different types of cathode MFCs

To investigate electricity generation and organic matter degradation in different types of cathode microbial fuel cells, a pair of two-chambered ferricyanide MFC and biocathode MFC were constructed. The changes of voltage and power density and degradation of sewage sludge organic matter in those two systems were studied. The results indicated that, with freeze/thaw treated sludge as substrate, the ferricyanide MFC achieved a stable voltage of 0.726V after running 8h, SCOD peaked at 3771.4mg/L in 6d and a maximum power density of 10.3W/m3was obtained, and the TCOD removal efficiency was 70.3% at the end of the cycle (20d). The biocathode MFC achieved a stable voltage of 0.76V after running 3d and then declined after operation of 22days, SCOD peaked at 4538.0mg/L in 15~20d and achieved a maximum power density of 13.7W/m3, and 80.6% of TCOD was removed at the end of cycle (30d). Compared with the two-chambered ferricyanide MFC, the two-chambered biochathode MFC could promote sewage sludge organic matter dissolution and electricity generation, the use of soluble carbohydrates and the degradation of organic matter were more complete, and at the same time the biocathode MFC was in favor of long-term stable operation.