After pre-treatment processes such as dedusting, humidifying or cooling, the odor and organic waste gas pass through the filter bed composed of filter materials from bottom to top. The odor and organic waste gas are transferred from the gas phase to the mixed phase of water and microorganisms, and are separated by the metabolism of microorganisms fixed on the filter materials. At present, the process is relatively mature and widely used in practice, which can be subdivided into soil deodorization, compost deodorization, peat deodorization, etc. The purification efficiency is high, the floor area is large, the investment cost is high, and it is easy to block. The filler needs to be replaced regularly, the deodorization process is difficult to control, and is greatly affected by temperature and humidity. The biological bacteria training takes a long time, and the recovery time after being damaged is long.