Spray wastewater mainly comes from pre-degreasing, degreasing, surface adjustment, phosphating, passivation and otherpre-treatment procedures. Cathode electrophoretic process and middle coating process, painting process, automotive paintingwastewater contains resin, surfactant, heavy metal ions, pigments and other pollutants, especially electrophoretic wastewater,paint wastewater composition is complex. High concentration and poor biodegradability. Spraying wastewater treatment ismainly divided into quality, coagulation precipitation, coagulation air floatation. Spraying wastewater is treated by sand filtrationprocess. The characteristics of spray wastewater treatment are as follows: there are many kinds of spray wastewater treatment,and the water quality varies with the materials used. There are many formulations in degreasing solution alone, and even morein paint types. Except for the continuous overflow discharge of some washing water, spraying line wastewater or waste liquidmostly changed greatly by intermittent concentrated discharge of 3. 3 water quality and water quantity, which can be followedirregularly.
Spraying wastewater treatment method: 1) physical treatment. There are separation method, filtration method, centrifugalseparation method and chemical treatment method. There are neutralization method, coagulation method, redox method and soon.