Method for treating molasses alcohol wastewater

The invention relates to a method for treating molasses alcohol wastewater, comprising the steps of: mixing the molasses alcohol wastewater and pig effluents in proportion for anaerobic fermentation, wherein an anaerobic reactor is a pilot-scale internal circulation reactor, an effective volume is 2m , an inflow COD (Chemical Oxygen Demand) is controlled between 4000 and 6000, and the water inflow is 1.5-2.2 m every 24 hours. By using the method, the removal rate of wastewater COD can reach 72%, and the yield of pure methane reaches 2.45 m per day. The method meets the requirement of manufacturers of producing alcohol by using molasses on wastewater treatment. Compared with the prior art, the method is simple and easy to operate and low in cost; and due to anaerobic fermentation, the renewable energy of methane is produced as heat energy for further use of enterprises or factories.