First, the aerobic tank is to create an aerobic environment (dissolved oxygen is about 4mg/L), which is beneficial to the growth of microorganisms. Its function is to degrade organic matter by aerobic activated sludge adsorption. Let the activated sludge carry out aerobic respiration, and further decompose the organic matter into inorganic matter. The function of removing most organic substances such as cod and ammonia nitrogen in sewage and pollutants. Good operation is the best way to control the oxygen content and other requirements of microorganisms, so that microorganisms can carry out aerobic breathing with maximum benefit.

Usually, carbon oxides in organic matter are oxidized into CO2 and H2O；; ; Oxidizing nitrogen into nitrite nitrogen and nitrate nitrogen; Phosphorus is oxidized to phosphate; At the same time, phosphate-accumulating bacteria absorb several times as much phosphate as anaerobic bacteria.

Second, the anoxic pool is to create an anoxic environment (dissolved oxygen is less than 0.5mg/L), which refers to a reaction pool with no dissolved oxygen and only nitrate. Is beneficial to that growth of nutrient-deficient microorganism. Its function is to degrade organic matter by activated sludge adsorption. Nitrite nitrogen and nitrate nitrogen in the reflux mixture are usually released by denitrifying bacteria.

Thirdly, the anaerobic pool is to create an anaerobic environment (dissolved oxygen is about zero), that is, there is no dissolved oxygen and no nitrate. Is beneficial to that growth of anaerobic microorganism. Its function is to degrade organic matter by activated sludge adsorption. In the anaerobic tank, anaerobic bacteria are used to hydrolyze, acidify and methanate the organic matter, so as to remove the organic matter in the wastewater and improve the biodegradability of the wastewater, which is beneficial to the subsequent aerobic treatment.

4. The anoxic pool, anaerobic pool and aerobic pool interact with each other, which are connected in series and affect each other.

Sewage treatment: the process of purifying sewage to meet the water quality requirements for discharge to a certain water body or reuse. Sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, catering and other fields, and it has also entered the daily life of ordinary people more and more.

References:

Baidu encyclopedia sewage treatment