The difference between traditional dissolved air flotation and vortex concave air flotation

1、 Traditional dissolved air flotation method

The traditional dissolved air flotation (DAF) system is also used to treat pollutants in water, but there are serious problems in both performance and operation.

The entire system is too complex, the operation is very cumbersome, the operating cost is high, and the processing water volume is small. It relies on a high-pressure pump to dissolve air in circulating water, forming dissolved air water and injecting it into the sewage. Although DAF has a circulating system, it is not enough in terms of preventing sludge from staying at the bottom of the oil collector. Many filtered solid substances will eventually flow back with the circulating water. When these impurities pass through the release device, it is easy to cause blockage of the release device. As a result, the effluent becomes turbid. Equipment such as pressure reactors, air compressors, and circulation pumps not only increase the responsibility and maintenance difficulty of operators, but also increase the cost of electricity consumption.

2、 Structure of THAF series vortex concave air flotation equipment

The vortex concave air flotation equipment mainly includes an air flotation box body, an aerator, a chain scraper system, a floating slag collection system, an electrical control system, a storage and dispensing system, a glass rotor flowmeter, a dosing pump, and a circular operating platform.

The equipment casing can be made of integral steel structure or provided with casing drawings by our company for self construction by the user.

3、 Working principle of THAF cavitation air flotation equipment

Untreated sewage first enters the aeration chamber equipped with an aerator. During the process of rising, the sewage is fully mixed with microbubbles generated by the air flotation machine. The aerator transfers the air on the water surface to the underwater through the exhaust pipe. The aerator uses the high-speed rotation of the bottom diffuser impeller to form a vacuum zone in the water. The air on the liquid surface is input into the water through the aerator to fill the gaps, and microbubbles are generated. Under the strong agitation of the impeller, microbubbles spiral up to the water surface, and oxygen in the air also enters the water.

Adding the first and second drugs in front of the aerator disrupts the stability of colloidal particles in the water due to the effect of drug power, promoting colloidal contact and forming flocs. By utilizing the vortex vortex vortex in the aeration chamber and the dense small bubbles, an organic combination is formed. As the 'flocs' rise in the aeration chamber, larger flocs are formed. The floc is separated from the water solid-liquid and enriched on the water surface. Driven by the water flow, the scraper pushes the suspended solids along the liquid surface into the sludge discharge pipeline. The purified sewage enters the overflow tank through the outlet under the metal plate before discharge. The overflow channel is used to control the water level of the air flotation machine to ensure that the liquid in the air flotation tank does not flow into the sludge discharge pipeline.