Dissolved air flotation machine

The principle of air flotation is to dissolve a large amount of air into the water, and after decompression, a large number of fine bubbles are formed, which adhere to suspended substances. Suspended matter condenses together under the adsorption of tiny bubbles and floats to the surface with the bubbles. Under the action of the scraper, the floating slag is separated from the water, and heavier impurities will settle at the bottom and be regularly discharged through the sewage system.

Air flotation machines require frequent maintenance during operation, especially in winter. Therefore, it is necessary to provide a detailed introduction to the factors that affect the operation of air flotation machines and the maintenance issues that need to be paid attention to in winter. Under these issues, it is essential to ensure the proper condition.

1. The impact of sewage quality on air flotation machines.

Due to the fact that industrial wastewater and sewage generally contain a considerable proportion of Ca2+ SO42-， And during the air flotation process, some flotation agents will be added. After the vortex concave air flotation system runs for a period of time, a layer of scale will adhere to the wheels and bearings of the air flotation machine, which will reduce the efficiency of the air flotation system.

2. The impact of sewage flow rate on treatment efficiency.

The impact of sewage flow rate on treatment efficiency cannot be ignored. During the operation of the air flotation machine, it is necessary to ensure uniform water distribution in each air flotation tank. Changes in flow rate indicate changes in pollutant levels, and it is necessary to adjust the dosage of chemicals in a timely manner to achieve the desired effect. When the sewage flow rate is too high, the horizontal flow velocity of the air flotation tank increases and the residence time is shortened, which is not conducive to the upward separation of flocs; Excessive flow velocity can cause excessive turbulence in the separation zone, leading to the breakage of foam floc complexes. When the water volume is too large, the height of the effluent weir should be adjusted in a timely manner to prevent sewage from entering the scum system.

3. The influence of coagulants and pH values on air flotation efficiency.

PAC and PAM series. The amount of flocculant added is not necessarily better. The dosage of organic polymers has a significant impact on the flocculation effect. Experimental results have shown that there is a certain dosage for the occurrence of flocculation. If the dosage exceeds this amount, the flocculation effect will decrease, and if it exceeds it too much, it will have the opposite protective effect. Moreover, the flocculants currently used are mostly acidic flocculants with suitable pH values. When the pH value of sewage exceeds the suitable pH value, it can cause the dissolution or fragmentation of flocs, which has a significant adverse effect on air flotation separation. Therefore, during operation, the pH value of the incoming water should be monitored and controlled.

The air flotation machine is suitable for treating water with low turbidity, high chromaticity, high organic content, low oil content, low surface active substance content, or water rich in algae. Compared to other air flotation methods, it has the advantages of high hydraulic load and compact tank body.

What are the requirements for winter maintenance of dissolved air flotation machine

1. Check whether the inlet sewage pump and reflux pump of the dissolved air flotation machine are frozen during work every day, including lubrication and oil filling of the water pump, tightness of the packing, sealing of the bottom valve, and oil filling of the air compressor.

2. Check whether the air filter of the air compressor has frozen, in order to determine whether the air compressor is operating normally and whether there are any noises or heating phenomena.

3. Check whether the transmission part and scraper of the slag scraper have hardened or broken in cold conditions to avoid affecting its use.

4. Pay attention to the mixing and storage tanks of coagulants to avoid freezing, and conduct small sample tests frequently.

5. Inspect the valve pipelines of each device to prevent blockage, and place them in the "on" or "off" position as required.

6. When stopping the machine, the water must be drained completely to avoid freezing and blockage.

The above is the operating status of the air flotation machine and winter maintenance. Please follow these questions.

The impact of sewage flow rate on treatment efficiency cannot be ignored. During the operation of the air flotation machine, it is necessary to ensure uniform water distribution in each air flotation tank. Changes in flow rate indicate changes in pollutant levels, and it is necessary to adjust the dosage of chemicals in a timely manner to achieve the desired effect. When the sewage flow rate is too high, the horizontal flow velocity of the air flotation tank increases and the residence time is shortened, which is not conducive to the upward separation of flocs; Excessive flow velocity can cause excessive turbulence in the separation zone, leading to the breakage of foam floc complexes. When the water volume is too large, the height of the effluent weir should be adjusted in a timely manner to prevent sewage from entering the scum system.