电解气浮/陶瓷平板膜过滤组合工艺处理含油废水的实验

EXPERIMENTAL TREATMENT OF OILY WASTEWATER FILTRATION BY ELECTROLYTIC FLOTATION/CERAMIC PLAT MEMBRANE

针对膜过滤处理采油废水过程中出现的油和SS在废水中累积导致无法连续运行的问题,以油田采油废水为处理对象,采用电解气浮与陶瓷平板膜组合工艺去除含油废水中油和SS,确定最佳反应条件。采用自制电解气浮-陶瓷平板膜装置处理含油废水。通过监测油和悬浮物浓度的变化,重点考察电流强度、反应温度、气浮时间等因素对处理效果的影响和跨膜压差的变化。结果表明:最佳电流强度为1.5 A,反应温度为50℃,气浮时间为9 min;阶段性开启电解气浮装置的周期为45 h。运行过程中出水含油量和SS均能达到碎屑岩油藏注水水质推荐指标及分析方法(SY 5329-94)中的A1级注水水质标准;利用电解气浮结合陶瓷平板膜处理含油废水工艺,可以短时间内降低陶瓷膜过滤过程中产生的浓油,保证了装置连续有效地运行。

To solve the.problem of the membrane discontinuous working in the treatment of oily wastewater causing by the accumulation of the oil and SS, the experiment were conducted with the oil-field wastewater as the processing object, electrolytic floatatiordceramic plate membrane combined process was used to treat oily wastewater and determine the best reaction conditions. The self-made electro-flotation device was combined with plate ceramic membrane for treating oily wastewater. Through monitoring the changes of oil and suspended solid concentration, the effects of the temperature, the current value, flotation time and the changes of the ceramic membrane flux on treatment efficiency and trans-membrane pressure were investigated. The treatment effect of using combined process was performed on the condition as follows： the current intensity was 1.5 A, the temperature was 50 ℃, the floatation time was 9 min, and electrolytic flotation device opening stage time was 45 h. The results showed that the oil content and SS could come up to the A1 class standards in Recommended Indexes and Analysis Method for Clastic Rock Reservoir Water Injection Water Quality （SY 5329--94）. The treatment process of electrolytic flotation combined ceramic flat membrane could reduce the thick oil in a short time efficiently and keep the device running continuously in the filtration.