不同运行条件对微生物燃料电池产电性能的影响

以双室微生物燃料电池为研究对象,改变活性污泥MLSS值、营养物质的量、营养物质种类、温度等运行条件,测量24 h内COD值、细菌数目和电压值,进而研究不同运行条件对微生物燃料电池运行初期产电性能的影响。结果表明:在其他同等条件下,只改变MLSS值时,MLSS值越大,产电性能愈佳,只改变葡萄糖浓度时,当葡萄糖浓度为60 mg/mL时,产电性能最佳,最大电压和功率密度可达224.8 mV和505 mW/m3,只改变营养物质种类时,当加入低糖和C源营养物质时,产电性能较佳,只改变运行温度,当温度为37 ℃时,产电性能最佳,最大电压和功率密度可达231.5 mV和535 mW/m3;改变上述条件时,细菌数目与MFC的产电性能呈显著正相关关系。

Effects of running conditions on electricity performance of microbial fuel cell

The effects of running conditions on the electrical performance of a microbial fuel cell in the early running stages were observed in this study. With a two-chambered microbial fuel cell as the research object, the MLSS value of the activated sludge, the amounts of nutrients, the type of nutrients, and the temperature were varied as different running conditions. The COD value, bacterial number, and voltage were monitored for 24 h. The results showed that when the other conditions were kept constant with the value of MLSS as the only variable, the higher the value of MLSS was, the better the electrical performance was. When glucose concentration was the only variable, 60 mg/mL glucose concentration was appropriate for optimal electrical performance. The obtained maximum voltage and power density were 224.8 mV and 505 mW/m3, respectively. When the type of nutrients was the only variable, low sugar and carbon source nutrients were appropriate for better electrical performance. When temperature was the only variable, 37 ℃ was appropriate for the best electrical performance; the obtained maximum voltage and power density were 231.5 mV and 535 mW/m3, respectively. When the above conditions were applied, significant positive correlations were observed between the number of bacteria and the electrical performance of the MFC.