The Application of Air Diffuser Aerator in Sewage Treatment

Wholesale micro fine air bubble diffuser manufacturers provide ideal solutions for your wastewater treatment. An air diffuser aerator or an air bubble diffuser can help a lot, you will discover nice ideas from the application info in sewage treatment.

What is an air diffuser aeration?

Air diffuser aeration is a means of bringing air into strong contact with water, with the aim of dissolving oxygen from the air in the water or banishing unwanted gases and volatile substances from the water into the air. In other words, it is a means of facilitating the exchange of substances between gas and liquid. It also has other important functions, such as mixing and agitation.

The Principle of An Air Diffuser Aerator

The oxygen in the air is transferred to the water through aeration, and oxygen is transferred from the gas phase to the liquid phase for mass transfer. The theory of this mass transfer and diffusion, which is currently more applied, is the double film theory proposed by Lewis and Whitman.

The double film theory suggests that there is a gas and liquid film at the "gas-water" interface. There is air and liquid flow outside the air film and liquid film, a turbulent state; between the air film and liquid film is a laminar flow state, there is no convection, and under certain conditions, there will be a pressure gradient and concentration gradient. If the concentration of oxygen in the liquid membrane is lower than the saturation concentration of oxygen in water, the oxygen in the air will continue to diffuse inwards through the liquid membrane into the water body, thus the liquid membrane and air membrane will become a barrier to oxygen transfer.

This is the double membrane theory. Obviously, the most effective way to overcome the liquid film barrier is to quickly change the "gas-liquid" interface.

This is exactly what aeration agitation does, this is done as follows:

Reduce the size of the bubbles, increase the number of bubbles, increase the turbulence of the liquid, increase the installation depth of the aerator and extend the contact time between the bubbles and the liquid.

It is on the basis of this approach that aeration equipment is widely used in wastewater treatment.

Aeration Application in Sewage Treatment

Biological treatment methods can be divided into two categories, aerobic and anaerobic, according to the oxygen demand of the microorganisms involved in the action. In general, the aerobic method is more suitable for lower concentrations of sewage, such as ethylene plant sewage; while the anaerobic method is more suitable for the treatment of sludge and higher concentrations of sewage. Aerobic biological treatment methods can be divided into two categories: the activated sludge method and the biofilm method.

The activated sludge method is an artificially enhanced method of self-purification of water bodies, a method of removing organic matter from wastewater that relies on the working body of activated sludge. The aerobic microorganisms present in the activated sludge must be in the presence of oxygen in order to function.

In the aeration tank of a wastewater treatment biochemical system, the oxygenation efficiency is positively correlated with the amount of aerobic microbial growth. The amount of dissolved oxygen supplied is based on the number of aerobic microorganisms, their physiological characteristics, the nature of the substrate and their concentration.

In this way, the activated sludge is in an optimal state to degrade organic matter. According to tests, the dissolved oxygen in the aeration tank should be maintained at 3 to 4 mg/L. If the oxygen supply is insufficient, the activated sludge performance is poor, resulting in a decrease in the effectiveness of wastewater treatment. To ensure that there is an adequate oxygen supply, it is necessary to rely on a device to do, such as an aerator.

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