Q: What is the performance of the air flotation device? What are the methods to judge the pros and cons?

A: The air flotation device is a device that removes suspended solids, grease and various gels in various industrial and urban sewage. The equipment is widely used in the treatment of industrial wastewater and municipal wastewater such as oil refining, chemical industry, brewing, slaughtering, electroplating, printing and dyeing, etc. According to dissolved air, it is divided into inflatable air flotation device, dissolved air flotation device and electrolytic air flotation device.

Air flotation devices generate air bubbles (such as jet flotation) through the mechanical shear and diffusion forces of water flow and diffuser plates. When the bubble diameter is about 1mm, it is not easy to combine with small particles and flocs, but it will break the flocs. It is not suitable for treating wastewater containing fine particles and flocs, and the air flotation effect is poor. If the bubbles are cut by mechanical power mechanical cutting, such as spiral propelling air flotation and vortex concave air flotation, the microbubble diameter of the main bubble group can also be 50UM. Japan, Europe and the United States introduced China's super-efficient shallow air flotation, except for the change of the pool type and the lack of convincing "zero progress", there is no substantial progress in technology.

The advantage of the screw propulsion type is that it does not use an air compressor, and the power consumption is slightly lower than that of the ultra-efficient shallow air flotation, but the performance still cannot exceed the performance range of the traditional conventional air flotation. For wastewater with a suspended solids content of only a few hundred mg/L, many conventional air flotation are ideal and effective, but when the suspended solids content reaches several thousand or even tens of thousands of mg/L of wastewater, conventional air flotation is powerless. is the advantage of this situation.

Air flotation device characteristics:

1. The air flotation device is an integrated device that integrates the reactor, the tank, the dissolved air tank and the dissolved air pump. Save space to a limited extent, adopt semi-enclosed or fully enclosed operation, fully automatic operation, and simple operation management.

2. Air flotation device, according to the characteristics of the air flotation process, an advanced tubular mixing reactor is designed, so that the mixing and reaction can be completed quickly through the pipeline. At the same time, the partially dissolved air water is directly added to the reactor, and the microbubbles participate in the reaction and condensation to produce "copolymerization", which makes the air float grow rapidly and become more stable. From the practical application effect, this method can not only save reagents, but also make the mixed reaction effect more ideal.

3. The air flotation device adopts the inclined plate inclined tube separation system, the residence time is short (5 ~ 10 min), the solid-liquid separation is complete, the effect is stable, and it is less affected by the fluctuation of the raw water. At the same time, the air flotation tank is higher and occupies a smaller area.

4. The air flotation device adopts advanced dissolved air system and air-water balance control system. The dissolved gas tank has high gas dissolving efficiency, and the liquid level in the tank is constant. The volume of the dissolved air tank is only one-sixth of the traditional dissolved air tank.

5. The air flotation device adopts a proprietary dissolved air release device, and the diameter of the released micro-bubble is controllable within a certain range. At the same time, its wide flow channel design makes it clogged.

6. The air flotation device has a complete slag, mud and sand discharge system, which adopts automatic control and is not affected by human operation.

7. The air flotation device adopts nitrogen dissolved gas, which solves the problem of accelerated corrosion caused by excessive dissolved oxygen content.

Currently, air flotation devices are used for water supply, industrial wastewater and municipal wastewater treatment. The advantage of the air flotation device is that its solid-liquid separation equipment has the characteristics of low investment, small footprint, high degree of automation, and convenient operation and management.

A method for judging the pros and cons of air flotation device

1. Diameter, density and uniformity of microbubbles

2. Energy consumption level

3. The stability of system operation and the difficulty of operation and maintenance

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