连续流UASB-MFC处理废水和产电效率研究

Study on the Efficiency of Continuous Flow UASB-MFC In Waste Water Treatment and Electricity Generation

本实验以糖蜜废水为底物,通过构建UASB-MFC耦合系统来研究耦合系统处理废水和产电能力。本实验进水浓度在初始时为2000 mg/L,反应器在低进水负荷下启动,通过改变水力停留时间使反应器成功启动。其性能优化通过不断提高进水COD浓度实现。实验结果表明:耦合系统在水力停留时间为6 h,温度(35±1)℃,pH7.0-8.0,容积负荷为8.0 kg·m^-3·d^-1时,经过47 d实现成功启动。经检测60.85%为系统最高COD去除率,出水pH值为6.7,发酵类型以混合酸性发酵为主。耦合系统所能承受的最大容积负荷为16.0 kg·m^-3·d^-1,这种情况下进水COD浓度是4000 mg/L,COD的最高去除率是69.21%,最大功率密度为98 mW/m^2。

In this experiment,molasses wastewater was used as substrate,and UASB-MFC coupling system was built to study the capacity of wastewater treatment and electricity generation.In this experiment,the reactor was started under low inlet load.The initial entrance concentration was 2000 mg/L The reactor was successfully started by changing the hydraulic residence time.In order to further optimize the reactor processing performance,the organic load of the reactor was enhanced.The final results indicate that:the coupling system started successfully after 47d when the hydraulic residence time was 6 h,the temperature was(35±1)℃,pH was 7.0-8.0,the volume load was 8.0kg·m^-3·d^-1.At this time,the maximum COD removal rate was 60.85%,the pH of the effluent was 6.7,and the fermentation method was mixed acid fermentation.The maximum capacity load that the UASB-MFC coupling system can tolerate was 16.0 kg·m^-3·d^-1,The highest removal rate of COD was 69.21% in case of the COD concentration of influent was 4000mg/L,and the maximum power density was 98 mW/m^2.