摘要
Abstract
As UF membranes,tow types of PVDF were used to treat PTA wastewater in advanced treatment process in an oil and gas company. One was produced by non-solvent induced phase separation method,called NIPS PVDF;the other was prepared by thermally induced phase separation method,called TIPS PVDF. The two types of PVDF membranes were polluted and membrane fouling of NIPS PVDF was much severer in use. In view of this difference in membrane fouling,structure characterizations of membranes were performed and analyzed to seek the mechanism behind by comparing the structural characters of two types of membranes and analyzing the wastewater composition. The results show that NIPS PVDF is mainly formed by β crystal phase which has strong polarity,and TIPS PVDF is mainly formed by α crystal phase which has no polarity. High concentration of Co ions and Mn ions in PTA wastewater have stronger tendency to be adsorbed by the polar NIPS PVDF and thereafter cause severe membrane foiling. EDS analysis of PVDF membranes further affirms such analysis. Finally,a few suggestions of relieving membrane fouling were raised.关键词
石化废水/膜污染/MBR系统/PVDF膜Key words
petrochemical wastewater/membrane fouling/MBR system/PVDF membrane分类
资源环境
