膜科学与技术

以废旧聚偏氟乙烯平板膜制备再生膜的研究

作者：吴杰，顾维娣，任月萍，李秀芬，王新华

单位：江南大学，江苏省厌氧生物技术重点实验室，环境与土木工程学院，无锡 204122

关键词：废旧平板膜；聚偏氟乙烯；再生膜；膜性能表征

出版年,卷(期):页码： 2015,35(5):79-84

摘要：

本文以MBR生活污水和微电子电镀废水处理工程产生的废旧PVDF平板膜制备再生膜，对比了再生膜与新膜的过滤性能和抗污染性能．通过清洗，溶解提取和浸没沉淀相转移的方法分别刮制生活污水和微电子电镀废水再生膜．对比清洗前后膜面的EDX谱图发现，清洗后膜面C和F元素的原子百分比（At%）升高，而N、P和Al、Ca、Mg、Mn和Sn等金属元素的At%显著降低．测试发现，生活污水和微电子电镀废水再生膜的平均孔径分别为132 nm和136 nm，孔隙率分别为89.01%和88.78%，与新膜的平均孔径（141 nm）和孔隙率（88.23%）接近，其纯水通量分别为377.54 L/m2•h和382.24 L/m2•h，对牛血清白蛋白（BSA）的截留率分别为86.60%和85.14%，均略高于新膜（355.30 L/m2•h 和82.30%）．此外，两种再生膜的相对通量衰减率（RFD）和相对通量恢复率（RFR）均高于新膜，说明与新膜相比，再生膜易于吸附蛋白质分子形成污染层，但膜面污染属于可恢复的污染，经过清洗后再生膜的纯水通量仍然高于新膜．

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.

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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