Design Of Odor Treatment Process For Sewage Treatment Station Of Coal Chemical Enterprise

A coal chemical company in Shandong is a coal chemical enterprise which produces coke,gas,tar,crude benzene,methanol and so on.Coking wastewater is treated by internal sewage treatment facilities.The main pollutants in wastewater are organics,ammonia nitrogen,volatile phenol and cyanide,which belong to organic wastewater with high concentration and high ammonia nitrogen.In the process of wastewater treatment,Open-type sewage treatment unit emits a larger odor,seriously affecting the business and the surrounding environment.The main components of the odor are ammonia,hydrogen sulfide,benzene,toluene,xylene,aniline,methyl mercaptan,ethyl mercaptan,carbon disulfide and dimethyl disulfide etc,and the odor is a typical volatile organic exhaust gas(VOCs).The characteristic of the exhaust gas is that it's hard to be collected because the open sewage treatment unit pool is too large.In addition,its composition is complex with certain humidity,and the odor thresholds of main pollutants are extremely low.Thus,high demand for its removal process is needed.Therefore,finding a set of energy-saving and efficient combination process is the key issue of this thesis,which is also one of the main research contents.In this paper,the odor components generated from coking wastewater treatment station were investigated.Based on the investigation and analysis of the characteristics and existing problems of odor emission control technology at home and abroad,through the analysis and comparison of many schemes,the combination process of "Pond seal + Negative pressure collection + Dewatering and dust removal+ Chemical scrubbing + Water washing + Low temperature plasma deodorization +Activated carbon adsorption combined process" was determined and designed.Through the actual operation of the Shandong coal chemical company sewage treatment station odor management project results show that the removal efficiency of VOCs major pollutants can reach 95%,the emissions control effect is obvious,and the discharge of major pollutants has reached the expected target.The system has the advantages of low operating cost,simple operation,stable operation,small floor area and so on,it's proved that this process is technically and economically feasible.The design has certain guiding significance for the treatment of odor in the same kind of industry,especially for the treatment of waste gas from coking wastewater treatment station in coal chemical enterprises.