Principle: the odor material is dispersed into the mixed liquor of the activated sludge in aeration mode, and it can be used in the application of the suspended growth of microorganisms. Scope of application: as of 2013, Japan has been used for waste disposal field, sewage treatment plant odor treatment. Advantages: activated sludge after domestication, to not exceed the limit of the amount of the stench, the removal rate of more than 99.5%. Disadvantages: by the aeration intensity, the application of the method has some limitations.