The dissolved air tank generates dissolved air water, which is decompressed and released into the water to be treated through the releaser. The air dissolved in the water is released from the water to form tiny bubbles, which combine with the suspended matter in the sewage to make the suspended matter less specific gravity than water and gradually float to the surface of the water to form scum. There is a scraper system on the water surface to scrape the scum into the sludge tank. Fresh water from the lower part of the overflow tank into the clean water tank.
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