Organic Substances in Petrochemical Wastewater Can Be Turned into Biogas     

The CNPC Research Institute of Petroleum Processing has developed a petrochemical wastewater treatment device based on the anaerobic-aerobic degradation mechanism. In the treatment of petrochemical wastewater, this device can both guarantee that the effluent water meets the discharge requirements and efficiently turn organic substances in the wastewater into biogas.
   After refined wastewater is treated with the device, the effluent COD is less than 60 mg/L and reaches the national Grade I wastewater discharge standard. The device can generate over 0.20 m3 methane per kilogram of COD when it treats petrochemical wastewater. For example, the refining and chemical wastewater treatment plants at PetroChina Daqing Petrochemical Co., Ltd. need to handle nearly 5000 tons of COD a year. If the device is used to process such wastewater, the recycled methane can amount to more than 1 million m3 a year. Moreover, this technology consumes little energy and does not generate much sludge.