dissolved air flotation is widely used in wastewater treatment, which can efficiently treat industrial wastewater and municipal wastewater from oil refining, chemical industry, brewing, vegetable oil production and refining, slaughter, electroplating, printing and dyeing, etc. What are the commissioning steps of dissolved air flotation?

The specific steps are as follows:

1. Clean water is injected into the air flotation tank to check whether there is leakage in each part of the tank.

2. Fill water and exhaust the dissolved air pump. After starting, gradually open the outlet water pipe valves until they are fully opened.

3. When the water level in the dissolved air tank rises and the pressure reaches the higher value that the water pump can provide, suddenly open the outlet valve of the dissolved air tank and flush the dissolved air pipe with high-pressure water, and repeat this for several times. Then start the air compressor. When the air pressure in the dissolved air tank reaches 490kPa, suddenly open the outlet valve of the dissolved air tank, flush the dissolved air pipeline again with rapid air flow, and repeat several times. After that, still flush with high-pressure water several times. Operate for many times until the dissolved gas pipeline is flushed, and then turn off the dissolved gas pump and air compressor.

4. Open the vent valves of the contact chamber and reaction chamber to lower the water level to a certain height or vent.

5. Install the upper releasers one by one and tighten them by hand. (Do not use a wrench to tighten)

6. Restart the dissolved air pump and air compressor. When the pressure of the air compressor exceeds the pressure of the water pump, slightly open the gate valve to make the air and water enter the dissolved air tank to dissolve the air at the same time. Be careful not to open the air valve too much to avoid the sudden drop of the pressure of the air compressor, which will cause the water to flow back.

7. When it is observed that the water level indicator pipe of the dissolved air tank has a water depth of about one meter, all outlet valves of the dissolved air tank shall be opened, and the gas release condition and effect of the dissolved air water shall be observed in the contact chamber.

8. Use the gate valve to regulate the air supply of the air compressor until the water level of the dissolved air tank is basically stable within the range of 0.6-1.0m (neither submerging the filler nor too low, and a small amount of water level rise and fall can be adjusted by opening the vent valve of the dissolved air tank slightly. Fully open the outlet valve to prevent the interception of the outlet valve and the release of bubbles in advance.

9. After the dissolved gas and gas release system are completely normal, open the water inlet valve, and at the same time put in a little excessive coagulant.

10. Control the water inlet valve to limit the water inflow within the design range.

11. Control the outlet valve of the air flotation tank to stabilize the water level of the air flotation tank at the slag collecting slot. After the water level is stabilized, measure the treated water volume with flowmeter, water meter and other equipment, and adjust it with inlet and outlet valves until the design flow is reached.

Notes for debugging:

1. Take temporary measures to inject water into the air flotation tank, and check whether there is leakage at all parts of the tank; If there is no tap water, the water pump can be started to inject water into the flotation tank, but sufficient coagulant shall be added at the same time. After filling, cover it and let it clear naturally.

2. After the pump starts, gradually open the pressure pipe and close the pump valve until it is fully opened.

3. When the water level of the air dissolution tank rises and the pressure reaches a higher value, the outlet valves of the water pump and water air dissolution tank are suddenly opened, and the air dissolution tank is flushed with high pressure water for several times. When the air pressure in the air dissolving tank reaches 5kg/cm, start the air compressor and turn on the air compressor.

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