中空纤维超滤膜处理聚合物驱采油污水中膜污染特性分析

CHARACTERISTICS OF MEMBRANE FOULING IN TREATMENT OF POLYMER FLOODING WASTEWATER WITH HOLLOW FIBER ULTRAFILTRATION MEMBRANE

聚合物驱采油污水中大量聚合物的存在影响了污水的性质,它对超滤膜的污染机理与一般采油污水不同。研究了超滤过滤模拟含聚合物污水过程中,聚合物浓度对膜通量的影响,通过对过滤实际原水污染膜纤维进行化学清洗以及污染膜表面和断面扫描电镜分析,优选化学清洗方案。在此基础上,采用优选的化学清洗方案对工程应用中的膜组件进行清洗。结果表明:随着聚合物浓度升高,膜通量衰减逐渐加剧;NaOH和十二烷基苯磺酸钠组合对聚合物污染清洗效果最佳,可恢复初始通量的75%;分析清洗后膜表面的扫描电镜图表明,原水中物质会在膜面累积形成稳定凝胶层并对膜造成不可逆污染。

The existence of a large number of polymers in polymer flooding oil production wastewater affects the properties of the sewage,and its pollution mechanism for ultrafiltration membranes is different from that of the general oil production wastewater.In this paper,the influence of polymer concentration on membrane flux in the process of simulating polymer-containing wastewater in ultrafiltration filtration was studied.The chemical cleaning scheme was optimized through chemical cleaning of the membrane fibers contaminated by the actual raw water and scanning electron microscope analysis of the contaminated membrane surface and section.On this basis,the preferred chemical cleaning scheme was used to clean the membrane modules in engineering applications.The research results showed that as the polymer concentration increased,the membrane flux attenuation gradually increased;the combination of sodium hydroxide and sodium dodecylbenzene sulfonate had the best cleaning effect on polymer pollution,which restored 75%of the initial flux;scanning electron microscopy showed that substances in the raw water would accumulate on the membrane surface to form a stable gel layer and cause irreversible pollution to the membrane.