陶瓷平板膜处理采油废水性能

Treatment of the oil extractionwastewater by plate ceramic membranes

为实现二次采油废水处理后水质达到低渗透率地层回注标准,以油田采油废水为处理对象,建立一套以陶瓷平板膜为核心的实验装置.通过监测陶瓷平板膜跨膜压差的变化,重点考察膜通量、反应温度、曝气量等因素对处理效果的影响.结果表明:最佳膜通量为22.5 L/(m2·h),反应温度为50℃,曝气量为1 L/min;经0.05 mol/L HCl或HNO3溶液浸泡12 h后,膜通量的恢复率保持在96%以上,膜片过滤性能恢复较好;采油废水经陶瓷平板膜处理后出水含油量及SS均小于1 mg/L,各项指标均优于SY5329—94《碎屑岩油藏注水水质推荐指标及分析方法》中回注水水质A1级标准.利用陶瓷平板膜处理采油废水可以取代传统采油废水处理流程中的浮选、粗滤、精滤步骤.

To achieve the water standard of low-permeability reinjection for secondary oil wastewater treatment, this experiment took the oil-field wastewater as the processing object, and an experimental device which took plate ceramic membranes as the core processing unit in the production site was set up. The study mainly focused on the effects of the membrane flux, reaction temperature and aeration rate on treatment by monitoring the changes in transmembrane pressure difference. On the premise of normal operation of the experimental device, the optimum membrane, reaction temperature flux and aeration rate was set as 22.5 L/（ m^2· h）, 50 ~C and 1 L/min, respectively. Filtration performance of membrane could be better recovered after immersing the membrane in 0. 05 moL/L HC1 or HNO3 solution for 12 h, and membrane flux recovery rate reached above 96%. As the results show, oil content and SS of effluenttreated by plate ceramic membrane are less than 1 mg/L, and all indexes of injection water are better than the A1 class standards in SY5329-94. It demonstrates that plate ceramic membranes can replace traditional steps in the oily wastewater treatment, such as flotation, rough filtration and fine filtration.