Aerobic microorganisms that survive and grow thanks to the system of supply and oxygen gas dispersion is mounted in the bottom of the tank. Waste water and air are mixed according to the principle of reverse; air contains oxygen are blown from the bottom up, waste water is brought from the top down, through the waste water cushion layer to be put all over the surface and exposed to oxygen. The particles of water and air also was assigned by network principles and effectively increase the exposure. Oxidation of organic matter in the tub of gas can be summarized by the following equation:
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