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The application method of tubular aerator in low-concentration sewage is aerobic method, and the aerobic microorganisms existing in activated sludge need to be effective in the presence of oxygen. In the aeration tank of the sewage treatment biochemical system, the aeration power is positively correlated with the growth of aerobic microorganisms. The amount of dissolved oxygen should be considered according to the number of aerobic microorganisms, physiological characteristics, substrate properties and concentration. In this way, activated sludge is in the most state of degrading organic matter.