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The role of aerobic, anoxic and anaerobic tanks in sewage treatment plants

At present, sewage is an important source of urban pollution. Generally, small sewage treatment plants use aerobic ponds to treat microorganisms in sewage.

In wastewater treatment, the biological reaction unit is the core. The quality of this part of the operation control is directly related to the operation of the entire sewage treatment plant. In the biological wastewater treatment process, the factors that affect the microbial activity can be divided into two categories: matrix and environment. The matrix includes nutrients, such as carbon-based organic compounds, that is, carbon source substances, nitrogen sources, phosphorus sources and other nutrients, and trace elements such as iron, zinc, and manganese; in addition, it also includes some toxic and harmful chemical substances such as phenol Compounds such as benzene and benzene, and also includes some heavy metal ions such as copper, cadmium, lead ions, etc. The biological pool is a place for microbial purification of sewage, which contains a large number of beneficial microorganisms, which can absorb harmful substances such as heavy metal ions and eutrophic substances in the sewage, so that the sewage can be cleaner and the sewage purification can be accelerated.

What is the role of aerobic, anoxic, and anaerobic tanks in a sewage treatment plant?

A. The aerobic pool is camp Create an aerobic environment (dissolved oxygen is about 4mg / L), which is conducive to the growth of good microorganisms. Its role is to adsorb and degrade organic matter by aerobic activated sludge. Activate activated sludge to aerobic respiration to further decompose organic matter into inorganic matter. Removes most of the organic matter such as cod, ammonia nitrogen in sewage, and removes pollutants. The good operation is to control the oxygen content and other optimal conditions of the microorganisms, so that the microorganisms can perform aerobic respiration with the greatest benefits.


Oxidizing compounds of carbon in organics are generally oxidized to CO2 and H2O; nitrogen is oxidized to nitrite and nitrate nitrogen; phosphorus is oxidized to phosphate; at the same time, polyphosphate bacteria absorb in aerobic environment several times. Phosphate under anaerobic conditions.

B.The hypoxic tank is to create a hypoxic environment (the dissolved oxygen is less than 0.5mg / L), which refers to the reaction tank without dissolved oxygen but with nitrate. Conducive to the growth of deficient microorganisms. Its role is to adsorb and degrade organic matter by activated sludge. The nitrite nitrogen and nitrate nitrogen in the reflux mixture are usually released under the action of denitrifying bacteria.

C.An anaerobic tank is a anaerobic environment (dissolved oxygen is about zero), which refers to a reaction tank without dissolved oxygen and nitrate. Conducive to the growth of vegetative microorganisms. Its role is to adsorb and degrade organic matter by activated sludge. In the anaerobic tank, the role of anaerobic bacteria is used to hydrolyze, acidify and methanate organic matter, remove organic matter in wastewater, and improve the biodegradability of sewage, which is conducive to subsequent aerobic treatment.


In conclusion:The aerobic tank is to maintain the dissolved oxygen content in the water at about 4mg / l through aeration and other measures, which is suitable for the growth and reproduction of aerobic microorganisms, so as to treat the structures of pollutants in the water. Because the decomposition and consumption of dissolved oxygen make the water body almost free of dissolved oxygen, it is suitable for anaerobic microorganisms to treat structures in the water. The hypoxic tank is aeration with insufficient or no aeration but the content of pollutants is low. Structures where oxygen microorganisms live. Different oxygen environments have different microbiomes. Microbes also change their behavior when the environment changes, so as to achieve the purpose of removing different pollutants. At present, many projects such as upgrading and upgrading of sewage treatment plants will use the MBBR process, which can effectively enhance the role of biological reaction units in treating sewage.


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