Chemical oxygen demand (COD) and color reduction of biodigester effluent (BDE) in a batch electrocoagulation (EC) reactor were investigated using an iron electrode. The effects of various parameters such as pH, current density, electrode gap, and electrolysis time were evaluated. Energy requirement and electrode loss were found to be functions of the pH. The settling and filterability characteristics of the treated solution were best at low pH. The results demonstrate that EC can be employed in rice grain-based distilleries to reduce the pollution load. Thermogravimetric analysis indicates that the residues obtained from the EC-treated BDE may be used as fuel.