The present invention relates to a multi-stage stink removing apparatus, and more particularly, to a liquid catalyst to a high concentration of the compound odorant is discharged from animal waste treatment facilities, sewage and livestock waste water treatment plants, biomass using facilities, sludge geonjohwa facilities, food processing facilities, and is the step-by-step use of the drug solution on the multi-stage odor that can effectively remove the odor as a unit apparatus.
Of the present invention, multi-stage deodorization apparatus and the pre-processing unit for a gas pre-treatment after the removal of the dust injected into the active oxygen or ozone containing malodorous substances, into contact with a passing gas pretreatment unit and a liquid catalyst to remove the hydrogen sulfide in the gas primarily passing into contact with the removal of hydrogen sulfide which, having passed through the gas removing hydrogen sulfide unit in three different types of chemical and sequential gas in the acid-based and neutral type and basic system and removing the composite odor of removing the bad smell substances, removing the composite odor parts contacting the gas with the cooling water and a post-processing to remove the malodorous substances remaining in the gas.