生物表面活性剂强化剩余污泥微生物燃料电池产电特性研究

Electricity Generation of Surplus Sludge Microbial Fuel Cell Enhanced by Biosurfactant

以剩余污泥为接种液和基质,探讨了添加生物表面活性剂(鼠李糖脂/TSS,0.3 g·g-1)对单室剩余污泥微生物燃料电池(SSMFC)产电特性及剩余污泥减量化的影响.结果表明,在一个运行周期中,对照组的产电周期为20 d,最大功率密度为236.8 mW·m-2,库仑效率为5.7%,TCOD去除率为28.6%,TSS去除率为28.9%,VSS去除率为33.4%,而实验组产电周期达到35 d,库伦效率为11.8%,最大输出功率密度为516.7 mW·m-2,较对照组增加了118.2%,TCOD、TSS、VSS去除率分别为58.5%、56.7%和66.3%,较对照组分别提高了104.5%、96.2%和98.5%.随着系统的运行,对照组和实验组系统输出电压均是先稳定一段时间后逐渐降低,污泥中SCOD、蛋白质和溶解性糖浓度均呈先上升再下降趋势.采用向剩余污泥中投加鼠李糖脂的方法可以增强SSMFC的产电效率,同时能显著增强剩余污泥减量化效果.

The effect of biosurfactant （rhamnolipid/TSS, 0. 3 g·g^-1 ） on the characteristics of electricity generation by surplus sludge microbial fuel cell （SSMFC） and the reduction of surplus sludge were discussed. In the control group, the electrogenesis cycle was 20 d, the maximal power density was 236. 84 mW· m-2, the coulomb efficiency was 5.7% , and the TCOD, TSS and VSS removal efficiency was 58.5% , 56.7% and 66. 3% , respectively. In the experimental group, the electrogenesis cycle was 35 d, the coulomb efficiency was 11.8% , the maximal power density was 516. 67 mW· m-2 which was increased by 118. 15 % as compared to the control group, and the TCOD, TSS and VSS removal efficiency was 58.5%, 56. 7% and 66.3%, which raised by 104. 5%, 96. 2% and 98.5% as compared to the control group, respectively. With the operation of the system, the output voltage of control group and experimental group kept stable for a period of time before gradually reduced, the SCOD, protein and soluble sugar concentrations of surplus sludge first increased and then decreased. This study demonstrated that the addition of rhamnolipid enhanced the electricity generation of SSMFC with simultaneous promotion of sludge reduction.