生物氧化技术除臭在污水处理厂中的应用

Application of Biological Oxidation Deodorization Technologyin Wastewater Treatment Plants

长庆石化运行三部污水区块现有碱渣预处理单元、高浓度污水处理系统、低浓度污水处理系统等8套污水、污泥处理设施。在生产过程中,无组织排放的废气对周围环境造成一定影响。废气主要组成为硫化氢、氨气、二甲苯、苯、甲苯、酚、烃类、甲硫醇、甲硫醚、二甲二硫等。对各种气体治理技术进行比对,选取生物氧化法工艺,该工艺集生物液滤、生物滴滤和生物氧化技术于一身,具有流程简单,装置占地少,减除效果明显,不产生二次污染,以及系统启动速度快、抗污染物冲击能力强、污染物去除效率高、运行成本低等优点。污染气体经过生物氧化系统处理后,在工况良好情况下,处理效果明显,可同时去除多种污染物组分。排放气体中VOC含量明显低于排放标准限值,显示出良好的处理效果。但由于系统补水为新鲜水(电导率约为1800μS/cm),导致生物氧化后系统排水电导率较高。准备将污水反渗透水引入生物氧化系统,以更好地提高生物氧化工艺的处理效果。

PetrChina Changqing Petrochemical Company is now operating three sewage blocks where there are eight sewage and sludge treatment facilities including an alkali waste pretreatment unit,a high-concentration sewage treatment system and a low-concentration sewage treatment system.During production,uncontrolled emission of exhaust gas has had a certain effect on the environment.The main constituents of the waste gas include hydrogen sulfide,ammonia,dimethyl benzene,benzene,methyl benzene,phenol,hydrocarbon,methyl mercaptan,dimethyl sulfide and dimethyl disulfide.Researchers compared various gas treatment technologies and adopted a biological oxidation method,which combines biological liquid filtration,biological trickling filtration and biological oxidation technologies.The benefits of this method include simple process,small size of unit required,good deodorization effect,no secondary pollution,fast system startup,strong ability to resist pollutant impact,high efficiency of pollutant removal and low operating cost.Polluted gas can be effectively treated by the biological oxidation system under good working conditions.A variety of polluting components can be removed.The content of VOC in the gas emitted is considerably lower than the limits of the emission standard,indicating that this treatment method is very effective.However,as the replenished water of the system is fresh water（with a conductivity of about 1800μS/cm）,the conductivity of the effluent after being treated with the biological oxidation method is high.Researchers plan to introduce reverse osmosis water from sewage into the biological oxidation system to improve the effect of application of the biological oxidation method.