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This study investigated the effect of mixed feeding of anaerobically cultured waste activated sludge (WAS) on the performance of microbial fuel cells (MFCs) in the treatment of solid potato waste. The maximum current densities of the four MFCs was estimated as 36, 5, 10 and 150 mA/m2, with the columbic efficiencies of 6.1, 0.3, 0.9 and 31.1%, respectively. Composition changes of dissolved organic matter (DOM) coupled with its interrelation with electricity generation and total and viable bacterial population at the end of the operation were investigated. The experimental results demonstrated that mixing WAS into solid potato enhanced the presence of the tyrosine-like aromatic amino acids and aromatic protein-like substances from the beginning of the operation and promoted hydrolysis and humification of the solid potato. In the final solution of the anodic chamber, more viable bacteria were detected for the reactors treating solid potato alone and the mixed feedstock with the smaller amount of sludge, where distinct electricity generation was observed.

Dissolved organic matter and bacterial population changes during the treatment of solid potato waste in a microbial fuel cell