Dissolved air flotation device for sewage treatment

Abstract

The invention discloses a dissolved air flotation device for sewage treatment. The dissolved air flotation device for sewage treatment comprises a pressurizing pump (1), a pressure air dissolution tank (2) and an air flotation pool (3), wherein the pressurizing pump (1) is arranged at the tail end of a sewage inlet pipe (4); a chemical adding opening (5) is formed in the sewage inlet pipe (4); the pressurizing pump (1) is connected with the pressure air dissolution tank (2) through a sewage conveying pipe (6) with an air releasing device (7); the pressure air dissolution tank (2) is connected with the air flotation pool (3) through a dissolved air sewage pipe (8); an air flow and a liquid flow are injected into the pressure air dissolution tank (2) through the air releasing device (7) and the pressurizing pump (1); air dissolved sewage in the air dissolution tank (2) passes through an air release valve (9) arranged on the top of the pressure air dissolution tank (2) and a pressure reduction valve (10) arranged on the dissolved air sewage pipe (8) to be simultaneously subjected to pressure stabilization and is then sent into the air flotation pool (3). The dissolved air flotation device has the advantages that the pressure of the air dissolved sewage can be effectively controlled; the air flotation stability and the separation efficiency are improved.

Description

technical field [0001] The invention relates to the field of sewage treatment equipment, in particular to a dissolved air flotation device for sewage treatment, which has a simple structure, is not easy to be blocked, has high separation efficiency, and has a long service life. Background technique [0002] The air flotation system is a device that removes various impurities such as fiber suspension, jelly and grease in various industrial and domestic sewage. It can try to generate a large number of air bubbles in the sewage to form water, air and impurities The three-phase mixture can effectively adhere to all kinds of tiny particles during the floating process of the air bubbles. Since the density of the bonded body is lower than the density of water, it will float out of the water, thereby achieving the purpose of solid-liquid separation. This device is mainly used in chemical fiber, papermaking, and pharmaceuticals. Purification and treatment of industrial sewage in indu...

AI Technical Summary

Problems solved by technology

The air flotation machines on the market are divided into two types according to the dissolved air method: turbo air flotation machines and dissolved air flotation machines. The turbo air flotation machines use turbo aerators to inject "microbubbles" directly into the sewage without prior dissolution Then the "micro-bubbles" are evenly distributed in the sewage through the air diffuser impeller, so the whole operation process will not be blocked, but the turbine air flotation machine is complicated in equipment and high in maintenance costs; the dissolved air flotation machine is operated by air pressure The machine and the booster pump inject the air flow and liquid flow into the air-dissolving tank, and send them to the air flotation tank after fusion. Due to the poor pressure stability of the fusion flow, turbulent flow is prone to occur, and the diameter of the released bubbles is large and uneven, which seriously affects the air flotation. efficiency

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