Principle of air flotation processAir flotation process is an efficient and rapid method of separating solid particles from water and wastewater.
It works on the principle that part of the treated wastewater circulates into the dissolved air tank, and under pressurized air, the air is supersaturated and dissolved, and then mixed with the raw water added with flocculant at the inlet of the air flotation tank, and due to the pressure reduction, the supersaturated air is released, forming tiny bubbles, which quickly attach to the suspended matter and lift it to the surface of the air flotation tank.
This results in the formation of a floating layer of sludge that is easily removed, and heavier solids settle to the bottom of the tank and are also removed.
The air flotation tank has been widely used in the purification of water supply where the turbidity of raw water is low, the algae is high, the temperature is low, the color is high and the dissolved oxygen is low, and it is also widely used in the wastewater treatment of oil refining, papermaking and dyeing and many other industries.
Expanded Information
From the appearance of the distinction, there are two main types of air flotation tanks: circular air flotation tanks and rectangular air flotation tanks;
Circular air flotation tanks known as the super-effective shallow air flotation, is the most advanced air flotation machine on the market, mainly the use of the theory of shallow pools and the zero-velocity principle, and highly efficient use of the international advanced micro-oxidation technology and high density ionic bubbles. Technology and high-density ionic bubble technology, changing the surface tension of the water, large-scale enhancement of dissolved oxygen in the water, a large number of adsorption of short-chain organic molecules in the water and colored groups, biochemical and physical degradation of COD is difficult to make a technological breakthrough.
The rectangular air flotation tank is the traditional air flotation process, only the use of a large number of air bubbles injected into the water, so that the water particles suspended in the water, in the process of operation does not achieve the effect of static flotation, the general stability of the effluent is poor.
Air flotation pool composition
Air flotation pool generally consists of flocculation chamber, bubble contact chamber, separation chamber composed of three parts. Respectively, it has the functions of completing the formation and growth of flocculation in the water, the adhesion of microbubbles to the flocs, trapping, flocs with gas and water, and so on. In addition to the flotation pool itself, there is a need for other ancillary facilities and its combination, such as pressure drop air flotation pool, need to be equipped with pressure Luo gas tanks and dissolved gas releaser and other devices.
Baidu Encyclopedia-Air Floatation Tank