Principle: solid filler special reaction tower packing, packing inside the compound multi medium catalyst. When the odor gas passes through the filler layer, and the liquid phase composite oxidant is fully exposed to the surface of the solid phase, and the pollution factors of the odor gas are decomposed by the catalytic action of the catalyst. Scope of application: wide range, especially for dealing with large volume, high concentration of waste gas, the hydrophobic pollutants have a good removal rate. Advantages: small area, low investment, low operation cost; management is convenient, that is, the use of. Disadvantages: impact load, not easy to pollutant concentration and temperature change, the need to consume a certain amount of medicine.