energy recoveries (0.346 Wh/g CODrem and 8.4% EE) were achieved at 1.51 g COD/L-d. More than 98% COD removal was recorded in all organic loadings except at a higher organic loading of 6.17 g COD/ L-d. Therefore, when considering the electrical parameter, the maximum power densities were achieved at 1.51 and 3.07g COD/L-d for the EEmax and CEmax, respectively. In addition to the major MFC parameter reported for the maximum power density
(Choi and Liu, 2014; Choi and Ahn, 2014b), other studies reported that the energy equivalent was dependent on organic removal, which can be the energy parameter, such as Wh/g CODrem or Wh/reactor volume (Choi and Ahn, 2013, 2014c; Ge et al., 2013a,b). Under both EEmax and CEmax conditions, a low organic loading provided higher energy recovery (in terms of Wh/g CODrem) as well as energy efficiency. In addition, the recovery of