Introduction of air flotation method for wastewater treatment

1. Air flotation, also known as air flotation, is a commonly used flotation method in sewage treatment. Air flotation is the use of air compression instantaneous release or mechanical shear to form micro-bubbles for flotation.

2. The commonly used bubble forming methods can be divided into suction air floatation of water pump suction pipe, diffusion plate aeration air floatation, jet air floatation and impeller air floatation machine. It is an operation process in which hydrophobic pollutant ions contained in a multiphase system such as sewage, pollutants and bubbles are selectively adsorbed from wastewater to bubbles and separated from water in the form of foam.

3. Air floatation is a water treatment technology that injects a large number of micro-bubbles into the water to make them adhere to the solid or liquid pollutant particles with a density close to that of water in the wastewater to form an air floatation body with a density less than that of water, and floats to the water surface under the action of buoyancy to form scum for solid-liquid or liquid-liquid separation.

4. Air flotation is mainly used to remove suspended solids, oils and fats with relative density from wastewater. It is a prerequisite for air flotation separation that the pollutant particles in wastewater can be stably adsorbed on the bubbles and float with the bubbles. Therefore, the removed pollutant particles should have hydrophobic surface. In order to improve the separation effect of the air flotation method, measures are often taken to change the surface characteristics of solid or liquid pollutant particles, add a certain amount of suspending agent to the water, make hydrophilic particles become hydrophobic particles, and add demulsifier (coagulant) to the emulsified oil waste water, so that the emulsified oil that is difficult to air flotation can be aggregated into suspended solids to remove.

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