Coating wastewater refers to the wastewater discharged during the coating process of resins, varnishes, and paints. The paint wastewater mainly comes from the cleaning of the batching tank. When the paints of different colors or properties are mixed, the batching tank wastewater occurs. The wastewater has high concentration, high chroma, high suspended solids content, intermittent discharge and less water.
Characteristics of paint industry wastewater
（1）The pollutant composition is complex and the pollutant content is high.
（2）Wastewater contains toxic substances. Coating wastewater generally contains toxic organic compounds such as phenolic and benzene.
（3）The dispersion of wastewater pollutant content and water quantity is large.
（4）Coating wastewater treatment is difficult and the treatment cost is high.
Hazards of paint industry wastewater
Suspended solids in surface water mainly come from soil erosion and suspended solids from received sewage. A large amount of suspended matter can make the water turbid, reduce the transparency, affect the respiration and metabolism of aquatic organisms, and even cause fish to suffocate and die.
Common processing methods
According to the characteristics of coating wastewater, biological rotary disc method and biological contact oxidation method with higher biochemical efficiency than activated sludge method are used to treat the comprehensive wastewater of the whole plant. Because these two biofilm methods are more effective in treating wastewater with small water volume, high toxicity and many refractory substances.
The biological turntable method has the advantages of easy film hanging, high organic removal efficiency, strong impact resistance, low operating power consumption, and convenient management.
Biological contact oxidation is a wastewater treatment method that has developed rapidly in recent years. It has the advantages of high treatment load, short residence time, small footprint and no sludge bulking.
The SBR process is an activated sludge process with intermittent operation. The aerobic bacteria in the device are fully mixed and contacted with the sewage. Under the condition of oxygenation, the bacteria absorb the organic matter in the water and decompose and synthesize it into its own components. Organics are removed from water.
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