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Biological treatment methods can be divided into two categories: aerobic and anaerobic according to the aerobic conditions of the microorganisms involved. In general, the aerobic method is more suitable for lower-concentration sewage, such as ethylene plant sewage; while the anaerobic method is more suitable for the treatment of sludge and higher-concentration sewage. The aerobic biological treatment method can be divided into two categories: activated sludge method and biofilm method.
Activated sludge method is an artificial enhancement method for water self-purification, and it is a method of removing organic matter in sewage that relies on the main body of activated sludge. The aerobic microorganisms present in activated sludge can only function in the presence of oxygen.
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.