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Poster Abstracts

Poster Title: Effect of configuration and solution conditions on power generation of air cathode microbial fuel cells (MFCs)

Authors: Shaoan Cheng, Defeng Xing, Bruce E. Logan

Poster Abstract: Air-cathode microbial fuel cell is likely the most efficient configuration to be scaled up for wastewater treatment. However, due to the diversity of wastewater, it is highly needed to well understand the effect of solution conditions on power generation of MFCs before we make a scale-up MFC. Here we investigated several factors related to design scale-up MFC, like anode and cathode size, solution conductivity, substrate concentration and hydraulic force. Increasing each electrode surface area increased the maximum power of MFC, but increasing cathode surface area was more efficient to power increase, for example, doubling surface area increased maximum power by 63 % for cathode, but only 11% for anode. Solution conductivity had great effect on cathode performance but less effect on anode performance. Substrate concentration mainly affected on anode performance. Hydraulic force had almost no effect on anode performance, but had great effect on cathode performance, especially in the low current range, cathode potential could drop by 100 mV when the hydraulic force increased by 10 times, indicating the scale-up air cathode MFC should be made in horizontal mode.