隔离曝气生物滤池预处理炼油废碱水

Pretreatment of Alkaline Wastewater from Oil Refinery Using Isolated Biological Aeration Filter

炼油废碱水是石油炼制过程中产生的一种含有大量硫化物、酚类和石油类等污染物的高浓度碱性污水。采用新型的两级隔离曝气生物滤池工艺,对中和后的炼油废碱水进行了生物预处理试验。研究了不同气水比、水力停留时间(HRT)和反冲洗周期等对污水中硫化物、挥发酚、COD和石油类等污染物处理效果的影响,并观察到了高活性的生物膜。试验结果表明:当污水流量为0.5~0.6m3·h-1、pH为6.5~8,单级反应器HRT为3~4h、DO为1.5mg·L-1以上,进水硫化物质量浓度不大于500mg·L-1、挥发酚质量浓度不大于400mg·L-1、COD质量浓度不大于2000mg·L-1和石油类质量浓度不大于120mg·L-1时,炼油废碱水经两级生物处理后,出水硫化物和石油类的平均质量浓度分别为2.71和8.88mg·L-1,挥发酚和COD的平均质量浓度分别为29.3和326mg·L-1,硫化物、挥发酚、COD和石油类平均去除率分别达到98.9%、85.1%、75.4%和89.8%,COD和硫化物的平均去除负荷分别达到5.44和1.74kg·m-3·d-1。隔离曝气生物滤池是一种高效、低成本的炼油废碱水预处理方法,具有良好的应用前景。

The alkaline wastewater from oil refinery is a high concentration alkaline wastewater, which contains a lot of sulfide, phenol and oil pollutants. A novel two stage isolated biological aeration filter was used for the biological pretreatment of the alkaline wastewater after its neutralization. During the experimental biological pretreatment process, the biological membrane with high activity was observed, and the factors affecting the removal of sulfide, volatile phenol, COD and oil pollutants in the wastew...