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Study of the preparation of recycled membranes by waste PVDF membranes

Authors： WU Jie, GUWeidi, RENYueping*, LIXiufen*,WANG Xinhua

Units： Jiangnan Univesity，Jiangsu Key Laboratory of Anaerobic Biotechnology，School of Environment and Civil engineering，Wuxi 214122

KeyWords： waste flat membranes；PVDF；recycled membranes；membrane performancecharacterization

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2015,35(5):79-84

Abstract：

The feasibility of the preparation of the recycled membranes using waste PVDF flat membranes that generated in the membrane bioreactor (MBR)engineeringsof domestic swage and electroplating wastewater has been investigated. The filtering and antifoulingperformances of the as-fabricated recycled membranes were tested and compared with that of the new membrane. Those two recycled membranes were separately prepared through cleaning, extracting and immersion precipitation phase transferin succession. By comparing the EDX results of the membranes before and after cleaning,it was obvious that the percentage by number of atoms (At%)forC and F elements on the membrane surfaces rose up, while the At% of N, P, Al, Ca, Mg, Mn, Sn and other metallic elements apparently descended. The properties characterizations of the recycled membranes and the new membrane showed that the average pore diameter of these two recycled membrane were 132 nm and 136 nm, respectively, and their porosities were 89.01% and 88.78%, respectively,which were approximate to that of the new membrane (141 nm and 88.23%). Moreover, the pure water flux of these two recycled membranes were 377.54 L/m2•h and 382.24 L/m2•h,whilst their bovine serum albumin (BSA) rejection ratio were 86.60% and 85.14%, which were slightly higher than that of the new membrane (355.30 L/m2•h and 82.30%). Furthermore, relative flux decay (RFD) and relative flux recovery (RFR) of these two recycled membranes were both higher than that of the new membrane, indicating that protein moleculeswere easier to absorbonto the recycled membranesand formed the pollution layer compared with the new membrane. However, the membrane surface pollution was reversible pollution sinceafter cleaning the pure water flux of the recycled membranes was still higher than that of the new membrane.

Funds：

国家高技术研究发展计划（863计划）项目子课题（2012AA063407）

AuthorIntro：

吴杰(1990-), 男，江苏省无锡市人，硕士生，从事有机废弃物资源化研究．

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