石化工业废水深度处理工艺各单元处理效果研究

目的研究某石化公司工业废水深度处理工艺效果,以减少环境污染、降低用水成本、提高水资源利用率,对该工艺的应用推广具有重要意义。方法采用的"絮凝气浮+BAF(曝气生物滤池)+多介质过滤+臭氧接触氧化+生物活性炭过滤+超滤反渗透双膜"工艺进行废水处理,利用紫外分光光度法、微波消解法、重量法、纳氏比色法等监测分析方法对各项污染物进行监测分析。结果絮凝气浮、BAF、多介质过滤单元对悬浮物去除较好,去除率为89.9%;臭氧化单元对石油类去除较好,去除率为62.5%,对氨氮反而增加,其浓度增加6.0%;生物活性炭去除氨氮及悬浮物较好,氨氮去除率达到79.1%,悬浮物去除率为98.3%;超滤反渗透单元去除氨氮较好,去除率为46.1%。数据显示生物活性炭单元出水已达到设计标准。结论各处理单元污染物监测指标显示,该石化公司采用的工业废水深度处理工艺流程的3个单元整体性能良好,处理后出水达到了设计要求。

Study on treatment effect of each unit in advanced treatment process of petrochemical industrial wastewater

Objective To study the effect of advanced treatment process for industrial wastewater in a petrochemical company in order to reduce the environmental pollution and water costs,improve efficiency of water resources.Methods The advanced treatment process for wastewater was flocculalion-floatation,biological aerated filtration(BAF),multi-media filtration,ozone exposure oxidation,biologic active carbon filtration and ultra filtration /reverse osmosis dual membranes.The pollutants were determined by ultraviolet spectrophotometry,microwave digestion,gravimetric method and Na’s colorimetry.Results The suspended solid removing rate by flocculalion-floatation,BAF and Multi-media filtration was 89.9%;the oil removing rate by ozone oxidation was 62.5%,but ammonia nitrogen increased 6.0%;the suspended solid removing rate by biologic active carbon filtration was 98.3%,ammonia nitrogen removing rate was 79.1%;the ammonia nitrogen removing rate by ultra filtration/reverse osmosis dual membranes was 46.1%.The data showed that the water treated by biological active carbon filtration met the design standards.Conclusion The monitoring pollutants in each processing unit indicate that the overall performance of three units in the advanced treatment process used by the petrochemical company is good and the treated water meets the design requirements.