After dissolved air flotation treatment, part of the clean water passes through the air flotation working pump, and the pressurized water-insoluble gas tank is mixed with air, and the air is dissolved in the water, and the dissolved gas efficiency reaches more than 80%. The air dissolved in the water of the dissolved air flotation machine is released from the water to form microbubbles with a particle size of 20-50μm, and the microbubbles are combined with the suspended matter in the sewage; then removed by a chain scraper installed on the air flotation tank Slag, in order to achieve the treatment effect.

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