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采用相同截留相对分子质量(100×103)、不同内径(1.2mm和1.0mm)的聚氯乙烯中空纤维超滤膜Ⅰ和Ⅱ处理青岛近海域海水,对极端操作条件下(死端模式和无反冲过滤)的膜分离性能以及不同清洗方案和效果进行了对比试验。结果表明,相同操作条件下,膜Ⅱ具有膜污染程度小、膜通量大、清洗效率高等优势;可逆污染去除率R表明,超声波和碱-EDTA的清洗效率更显著,且2者对膜Ⅱ的清洗效率均比膜Ⅰ高。采用扫描电镜和红外光谱分析膜样品,发现膜Ⅰ比Ⅱ膜污染严重;超声波清洗仍无法完全去除膜污染,污染物含有类脂、多糖、腐殖质和木质素等物质。
Using the same molecular weight cut-off (100 × 103) and different inner diameters (1.2mm and 1.0mm) of polyvinyl chloride hollow fiber ultrafiltration membranes Ⅰ and Ⅱ, the seawater in Qingdao offshore area was treated. Under extreme operating conditions (dead end mode and no Recoil filter) membrane separation performance and different cleaning programs and the effect of a comparative test. The results showed that under the same operating conditions, membrane Ⅱ has the advantages of small membrane fouling, large membrane flux and high cleaning efficiency. The reversible fouling removal rate R shows that the cleaning efficiency of ultrasonic and alkali-EDTA is more remarkable, The cleaning efficiency than the membrane Ⅰ high. The membrane samples were analyzed by scanning electron microscopy and infrared spectroscopy. It was found that the membrane Ⅰ was more polluted than the membrane Ⅱ. The membrane cleaning could not be completely removed by ultrasonic cleaning. The pollutants contained lipids, polysaccharides, humus and lignin.