油田采出水处理中陶瓷膜表面水润湿性

陶瓷膜污染是制约陶瓷膜技术大规模应用的关键问题.膜表面水润湿性反映了膜的污染程度.作者分析了处理油田采出污水的陶瓷膜表面对水润湿角及水润湿角随时间的变化.从颜色观察膜芯各处污染程度不同,污染轻处膜面对水润湿角70.4°.污染重处膜面对水润湿角105.9°,由亲水性转变为亲油性,水渗透性变差.经灼烧处理后膜面均为亲水性,水渗透速率较处理前提高.灼烧分析陶瓷膜有机污染物量平均为膜质量的0.78％,酸洗分析无机垢占膜质量的0.28％,以钙盐和铁盐为主.热重分析证明膜污染重处较污染轻的位置有机污染物高约1.5％.

The surface wettability of ceramic membrane in treatment of produced water

Ceramic membrane fouling is the critical problem that restricts the industrial applications of ceramic membrane.The surface wettability of membrane reflects the degree of contamination on the membrane.In this paper,we have analyzed the changes of water wetting angle and water wetting angle on the surface of the ceramic membrane treating oilfield wastewater over time.The degree of contamination in membrane core can inferred by the colour,the water wetting angle on the membrane surface which is lightly polluted is 70.4°,while the water wetting angle on the heavily polluted membrane surface is 105.9°,which hydrophilicity transformed into lipophilicity,and the water penetration deteriorated.After burning treatment,the membrane surface is generally hydrophilic,and the water permeation rate has been increased compared to the priors.Averagely,the ceramic membrane organic pollutants make up 0.78％ of the membrane weight after burning treatment,and inorganic scale accounts for 0.28％ of the membrane weight after pickling,in which the calcium and iron salts are in the majority.Thermal gravimetric analysis has proved that organic pollutants on the membrane surface heavily polluted by more than 1.5 ％,compared with the membrane surface lightly polluted.