Electricity Production During The Treatment Of Real Electroplating Wastewater Containing Cr~(6+) Using Microbial Fuel Cell

摘要

Microbial fuel cell (MFC) was employed to dispose Cr~(6+) in real electroplating wastewater and generate electricity simultaneously. The experiments were carried out in a dual-chamber MFC. Under the condition of pH 2 and using graphite paper as the cathode electrode chromium removal and power density were highest. Moreover, increasing initial concentration of Cr~(6+) could enhance the power density. The results indicated that when treating a real electroplating wastewater containing Cr~(6+) with the initial concentration of 204 ppm in the MFC, the maximum power density of 1600 mW/m~2 was generated at a columbic efficiency of 12%. In addition, 99.5% Cr~(6+) and 66.2% total Cr were removed through reduction of Cr_2O_7~(2-) to Cr_2O_3 precipitating on the surface of cathode electrode. MFC was proved to be a promising technology for removing Cr~(6+) from electroplating wastewater.