Electrophoretic paint wastewater mainly includes degreasing wastewater and surface conditioning phosphating wastewater. The main pollutants include degreasing agent, phosphating agent, surface conditioner, electrophoretic paint, and the concentrated waste liquid discharged from the regular replacement tank of each process tank. The wastewater generated mainly includes: COD, BOD, SS, petroleum, total phosphorus, pH, ammonia nitrogen and other pollutants. Main treatment process regulation - flocculation and sedimentation