Electroplating wastewater contains a large amount of difficult to degrade substances, and it is difficult to meet the discharge requirements of the treated wastewater using biochemical treatment methods. Therefore, physical and chemical methods are generally used for processing. The commonly used equipment is a super dissolved air flotation device.

Working principle: Air is pumped into a pressure dissolved gas tank and forcibly dissolved in water at a pressure of 0.5 MPa. When the pressure suddenly drops, the air dissolved in the water escapes, forming a large number of tiny bubbles that adsorb suspended solids during the slow rise process. The suspended solids float to the surface under the action of a large number of tiny air flotation, achieving the goal of removing SS and COD.