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In the aeration tank of the sewage treatment biochemical system, the oxygenation efficiency is positively correlated with the growth of aerobic microorganisms. The supply of dissolved oxygen should be comprehensively considered according to the number of aerobic microorganisms, physiological characteristics, substrate properties and concentration. In this way, activated sludge can be in a state of degrading organic matter well. According to experiments, it is advisable to maintain the dissolved oxygen in the aeration tank at 3 to 4 mg/L. If the oxygen supply is insufficient, the performance of activated sludge will be poor, resulting in a decrease in wastewater treatment effect. In order to ensure sufficient oxygen supply, it must be done by a device, such as an aerator.