Effect of stirring rates in anodic area of sediment microbial fuel cell on its power generation.

The effect of stirring rates in anodic area of sediment microbial fuel cell on its operating performance, in terms of variations in power generation and sludge properties, was investigated in this work. The power density under 100 r/min stirring rate amounted to the highest peak value (98.8 mW/m2for the 9th cycle). The volume average sizes of sludge flocs decreased with increasing the stirring rates, but the content of extracellular polymeric substances of sludge increased. According to cyclic voltammetry examination, significant improvement in electrochemical activity with microorganism growth was due to some kinds of mediating compounds produced in cell-associated form. [ABSTRACT FROM PUBLISHER]