When municipal wastewater is
compared to acetate medium, there are three key differences: [1]
biodegradability, [2] alkalinity, and [3] presence of particulates.
Literature have commonly reported that the biodegradability of
the wastewater was very poor, as compared to acetate, which
seems to account for low current density in sewage-treating MXCs
[1,9,36]. However, it is daring to conclude that poor biodegradability
of domesticwastewater mainly decreases current density in
the MXCs because the other two important factors of alkalinity and
particulates can also limit current density in the MXCs.