Dissolved air system is a key part of the entire air floatation process. The dissolving air equipment used in this system is a dissolved air cylinder and the air is dissolved in water under a pressure of 2.5 to 4 kg/cm2. After the pressure water passes through the releaser, the dissolved air is released by energy dissipation, and excess water is released from the water, so that small bubbles naturally form when passing through the liquid, and the bubbles are very small, and its diameter is about 5-20 microns.
The water in the dissolved air system will be effectively mixed with the waste water to be treated through its releaser, so that the small bubbles will slowly rise and adhere to the impurity particles. This will directly form a floating body with a specific gravity less than that of water. On the surface of the water, dross is formed, and then the scum is removed by a scraper. We have now improved the dissolving method. The diameter of the dissolver cylinder is between 150mm and 500mm. The air enters the special air smashing device in the air dissolver through the air inlet pipe. It is fully mixed with the return water. The pressure of the air dissolver can only be controlled at 3.8. Bar can be around. No need for operator on-site monitoring, equipment can run smoothly on its own.
Pressurized gas-dissolving system equipment is often used in its solid-liquid separation equipment, and is used to a certain extent in wastewater treatment projects. Under the pressurized conditions, the air has high solubility, and the dissolved gas is decompressed by rapid polymerization to release a large number of micro-bubbles with fine and uniform size, dense and stable. The floating process of the microbubble cluster is stable, and the disturbance to the liquid is small, ensuring the air flotation effect. Especially suitable for solid and liquid separation of fine particles and loose flocs.
Pressure dissolved air system equipment can be divided into: according to the amount of dissolved air water: all sewage pressure dissolved air floatation and part of the sewage pressurization dissolved air floatation two, which is characterized by sewage (to be used in all and part) pump Pressurized to 3-4kg/cm2, into the dissolved gas tank of the special device, the air is fully dissolved in water in the tank, and then suddenly dropped to atmospheric pressure in the air floatation tank, when the supersaturated water is dissolved. The air escapes in the pool in the form of fine bubbles, and the suspended particles or oil particles in the water are brought to the surface to form scum. In engineering, some sewage pressurization and dissolving methods are often used. This method saves electricity, has a small equipment volume, consumes less coagulant, is easy to operate, and does not block. The efficiency of this method can reach more than 90%. http://www.shallowairfloatation.com/