In the traditional air flotation device, the residence time of the water body is generally controlled at 10 to 20 minutes; in the shallow air flotation device, the residence time is only 2 to 3 minutes. In the traditional air flotation device, the dissolved air system is equipped with a dissolved air tank. If calculated according to the actual volume of the dissolved air tank, the hydraulic retention time is 2 to 4 minutes; in the shallow air flotation device, the dissolved air system adopts the It is an air-dissolving pipe, and the filler is canceled, so that the volume utilization rate of the air-dissolving pipe reaches 100%, and its hydraulic retention time is only 10-15s.

In the traditional air flotation device, the scum scraper regularly removes the scum layer, which cannot be selectively cleaned according to the floating time of the scum. Therefore, not only the water body is greatly disturbed, but the moisture content of the scum In the shallow air flotation device, the spiral skimmer is installed at the front of the water distribution system, and the scum removed is always the scum that has been floating for a long time (2 to 3 minutes) in the air flotation tank, that is, solid-liquid Separation of scum with a water content of less than 1 is completely separated.

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