Coating is a form of surface treatment that involves applying paint, rather than metal, to the surface of an object. Just like with other surface treatments, it is important to wash the surfaces thoroughly to remove grease. Painting can be done through both spraying and powder coating. Wastewater from a painting facility typically contains suspended substances, transition metal ions, and oil.
Typical reductions of different categories of substances are presented below:
• Suspended solids: 90+%
• Transition metal ions: 90+ %
• Oil index: 90+ %.
