Abstract

A biodiesel wastewater treatment technology was investigated for neutral alkalinity and COD removal by microbial fuel cell. An upflow bio-filter circuit (UBFC), a kind of biocatalyst MFC was renovated and reinvented. The developed system was combined with a pre-fermented (PF) and an influent adjusted (IA) procedure. The optimal conditions were operated with an organic loading rate (OLR) of 30.0g COD/L-day, hydraulic retention time (HRT) of 1.04day, maintained at pH level 6.5-7.5 and aerated at 2.0L/min. An external resistance of circuit was set at 10kΩ. The purposed process could improve the quality of the raw wastewater and obtained high efficiency of COD removal of 15.0g COD/L-day. Moreover, the cost of UBFC system was only US$1775.7/m ³ and the total power consumption was 0.152kW/kg treated COD. The overall advantages of this invention are suitable for biodiesel wastewater treatment. © 2011 Elsevier Ltd.