Overview of structural schematic diagram of air flotation machine

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.

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. Air floatation is a water treatment technology that injects a large number of micro-bubbles into the water or generates a large number of micro-bubbles by electrolysis to make them adhere to the solid or liquid pollutant particles with a density close to that of water in the wastewater, form an air floatation body with a density less than that of water, and float up to the water surface to form scum under the action of buoyancy, so as to carry out solid-liquid or liquid-liquid separation. Air flotation method is mainly used to remove suspended solids, oils and fats with relative density from wastewater, and can also be used for concentration of high concentration 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.

The air floater is of steel structure, and its working principle is: the air is pumped into the pressure air dissolving tank, and is forced to dissolve in water under the pressure of 0.5Mpa. In the case of sudden release, the air dissolved in the water is separated out, forming a large number of dense microbubbles, which are adsorbed in the suspended solids during the slow rise process and float upward, to achieve the purpose of removing SS and COD.

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