When the shallow air flotation device is started, first add water to the air flotation tank so that the water level of the air flotation machine reaches the screw propeller, and the water level of the air flotation tank can be controlled by the water outlet adjustment plate. Close all control valves, turn the electrical knob switch to the automatic position, start the water pump, and the air compressor should also enter the automatic working state, then open the water inlet valve and outlet valve of the clean water pump, and the pressure of the pressure gauge gradually rises to 4 kg.

Open the water control valve of the air flotation dissolved air tank, let the dissolved air mixed water pass through the releaser, and release the flocculation and mixing section of the air flotation tank. A large number of fine air bubbles appear in the air flotation tank, making the water turn milky white, and the gas in the dissolved air system is released by Air compressor provided. As the dissolved air water continuously takes away the air in the tank, the air in the tank gradually decreases and the water level rises. When the water level rises to a certain position, the float level gauge will control the air compressor to work so that there is enough air in the cylinder.

After the shallow air flotation system operates normally, the sewage after the dosing reaction is sent to the air flotation mixing tank. The amount is small at first, and then gradually increases after normal operation. First, use tap water as return water, and then use treated water as return water after normal operation. If there are too many impurities in the return water, the air flotation effect can be heard, and water can be used all the time.

The trolley-type slag scraper is turned on for a long time to avoid too much suspended matter affecting the water discharge effect. When the shallow air flotation stops, the sewage control valve should be closed, then the sewage pump should be closed, the scum should be scraped off, then the clean water valve should be opened, and tap water should be opened for 30 minutes.

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