油田作业废水光催化氧化降解研究
Photocatalytic Oxidation Degradation Study for Operation Wastewater Treatment in Oil Field
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摘要: 油田作业废水中添加剂种类繁多,处理难度较大,主要采用化学法、生化法、固化法进行处理,但存在处理成本高、容易造成二次污染等缺点。以改性膨润土负载TiO2-Ag2O复合催化剂处理川中矿区角53井钻井废水和南阳油田探23井压裂废水,详细探讨了溶液pH值、TiO2加量、充气量和光照时间对废水COD去除率的影响。 结果 表明,在溶液pH值为3,TiO2加量为0.4%(ω),充气量为15L/min,光照时间为3h的最佳条件下,钻井废水和压裂废水的COD去除率分别为70.3%和57.0%。此催化剂性能稳定,无二次污染,经高温活化后,可反复多次使用,能有效降低废水处理成本,值得推广应用。Abstract: Due to great variety of additives and disposal difficulty, chemical method, biochemical method and solidification are adopted to treat operation wastewater in oil field. These processes easily bring about shortcoming, including high cost and secondary pol