Classification of waste gas treatment methods
Dilution diffusion method
Principle: The odorous gas is discharged to the atmosphere through the chimney, or diluted with odorless air to reduce the concentration of malodorous substances to reduce the odor.
Scope of application: Applicable to the treatment of medium and low concentrations of organized emissions of malodorous gases. Advantages: low cost and simple equipment. Disadvantages: susceptible to meteorological conditions, odorous substances still exist.
Water absorption method
Principle: The use of certain substances in the odor is easily soluble in water, so that the odor component is directly in contact with water, so that it dissolves in the water to achieve the purpose of deodorization.
Scope of application: malodorous gases of water-soluble, organized sources. Advantages: simple process, convenient management, low equipment running cost, secondary pollution, need to treat the washing liquid.
Disadvantages: low purification efficiency, should be used in combination with other technologies, and the treatment effect on mercaptans and fatty acids is poor.
Aerated activated sludge deodorization
Principle: The malodorous substance is dispersed into the mixed liquid containing activated sludge in the form of aeration, and the malodorous substance is degraded by the suspended growth microorganism, and the application range is wide.
Scope of application: Japan has been used for odor treatment in manure disposal sites and sewage treatment plants. Advantages: After acclimation of activated sludge, the removal rate of malodorous components that do not exceed the ultimate load can reach 99.5% or more. Disadvantages: Due to the limitation of aeration intensity, the application of this method has certain limitations.
Multi-media catalytic oxidation process
Principle: The reaction tower is filled with a special solid filler, and the filler is internally compounded with a multi-media catalyst. When the malodorous gas passes through the packing layer under the action of the induced draft fan, it is in full contact with the liquid phase compounding oxidant which is sprayed in a mist by a special nozzle on the surface of the solid phase packing, and under the catalysis of the multi-media catalyst, the malodorous gas The pollution factor in it is fully decomposed.
