Under Water Working Principle of Aerator

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2019/9/29

Aeration is a method of bringing air into intense contact with water. Its purpose is to dissolve oxygen in the air into the water or to remove unwanted gas from the water. Body and volatile matter are banished to the air.

The double film theory holds that there are gas film and liquid film on the "gas-water" interface, and air and liquid flow outside the gas film and liquid film, which is a turbulent state.

There is laminar flow between the gas film and the liquid film, and there is no convection. Under certain conditions, there will be pressure gradient and concentration gradient.

Aeration types are generally divided into two types: one is air blast aeration and the other is mechanical aeration. Blowing aeration adopts an aeration blower and an aerator; Aeration mode of introducing bubbles into water by diffusion plate or pipe.

This method is generally adopted for sewage treatment in ethylene plants. Mechanical aeration refers to an aeration method that uses impellers and other instruments to introduce bubbles.

All aeration equipment shall meet the following three functions:

(1)generate and maintain effective gas-water contact, and maintain a certain dissolved oxygen concentration in water under the condition that biological oxidation continuously consumes oxygen;

(2) sufficient mixing action and water circulation flow are generated in the aeration zone;

(3) maintain the sufficient speed of the liquid so that the biosolids in the water are in suspension.

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