The major limitations to implementation of MFCs for treatment of wastewater are their power density is still relatively low and the technology is only in the laboratory phase. Based on the potential difference, ΔE, between the electron donor and acceptor, a maximum potential of nearly 1 V can be expected in MFCs, which is not much greater than the 0.7 V that is currently being produced21. However, by linking several MFCs together, the voltage can be increased. Current and power densities are lower than what is theoretically possible, and system performance varies considerably as shown in Table 1. The maximum power density reported in the literature, 3600 mW/m2, was observed in a dual-chamber fuel cell treating glucose with an adapted anaerobic consortium in the anode chamber and a continuously aerated cathode chamber containing an electrolyte solution that was formulated to improve oxygen transfer to cathode.