劣质重油加工污水处理场恶臭气体治理工程实践

劣质重油加工污水处理场会排放大量臭气,造成严重大气污染。臭气中,硫化氢、氨气、非甲烷总烃(VOC)对人体危害巨大,是国家恶臭污染排放标准中规范的重点物质。为实现恶臭气体达标排放,利用组合式生物除臭技术(BRI)处理辽河石化炼油污水处理场恶臭气体,开展小试实验实现VOC类物质达标排放后,并将其应用于实际生产过程,持续监测显示:该技术对辽河石化三高型原油炼油污水处理场的高浓度臭气治理效果明显,硫化氢排放速率仅为国标限定值的11.1%,VOC排放速率仅为限定值的0.89%,而氨气则完全实现了零排放。与常规生物技术相比,BRI技术处理效果优异,稳定性能良好,且具有强抗冲击负荷性能,是处理高浓度的含硫、含氮、含烃类恶臭气体的最佳选择之一。

A biofilter model for simultaneous simulation of toluene removal and bed pressure drop under varied inlet Ioadings

In this study, a biofiltration model including the effect of biomass accumulation and inert biomass growth is developed to simultaneously predict the Volatile Organic Compounds （VOCs） removal and filter bed pressure drop tmder varied inlet loadings. A laboratoryscale experimental biofilter for gaseous toluene removal was set up and operated for 100 days with inlet toluene concentration ranging from 250 to 2500 mg· m^-2 According to sensitivity analysis based on the model, the VOCs removal efficiency of the biofilter is more sensitive to Henry＇s constant, the specific surface area of the filter bed and the thickness of water layer, while the filter bed pressure drop is more sensitive to biomass yield coefficient and original void fraction. The calculated toluene removal efficiency and bed pressure drop satisfactorily fit the experimental data under varied inlet toluene loadings, which indicates the model in this study can be used to predict VOCs removal and bed pressure drop simultaneously. Based on the model, the effect of mass-transfer parameters on VOCs removal and the stable-run time of a biofilter are analyzed. The results demonstrate that the model can function as a good tool to evaluate the effect of biomass accumulation and optimize the design and operation of biofilters.

天津市张贵庄污水处理厂除臭系统设计

在天津市张贵庄污水处理厂的设计中,针对各臭气产生单元的不同特点,分别采用了不同除臭系统,如污水处理系统采用了全过程除臭工艺,污泥浓缩脱水机房采用了离子除臭工艺,污泥处置中心采用了生物滤池工艺,均发挥了各处理工艺的优势,取得了较好的处理效果。经检测,厂区周界下风向无组织排放恶臭、氨、硫化氢浓度最高点均达到了天津市地方标准《恶臭污染物排放标准》(DB 12/—059—95)。