Startup of A2/O Combined with Microbial Fuel Cell and Influencing of C/N on the System

Abstract

Aiming at treating domestic wastewater and producing electricity in the same time, the efficiency of microbial fuel cell (MFC) combined with conventional A2/O system was studied. The system reached the maximum average voltage of 574 mV after batch feeding 37 days with 1000 Ω external resistance. The average COD and ammonia removal efficiencies were 92.9% and 72.1%, respectively. In order to examine the effects of C/N on the electricity production and wastewater treatment efficiency, external resistance was changed to 100 Ω with continuously feeding after starting up. Three C/N with 3, 4.2 and 6 were compared in this study. The results showed that the system reached the maximum average voltage of 534 mV when the C/N was 4.2. At the same time, the COD removal rate reached 96.1%~97.1%. It was observed that C/N had not discernible effects on ammonia removal rate.