超滤运行条件对跨膜压差影响的试验研究  

Experimental study of influence of ultrafiltration operation controlling on transmembrane pressure

作　　者：许航[1,2] 陈卫[1,2] 杨金虎[1,2] 潘少林[1] 

机构地区：[1]河海大学环境学院 [2]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《华中科技大学学报（自然科学版）》2012年第6期117-121,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：中国博士后科学基金资助项目(20100481083);水体污梁控制与治理科技重大专项基金资助项目(2011ZX07410-001)

摘　　要：为优化超滤运行工况,降低膜污染和提高超滤产水率,对超滤的水力反洗方式及运行参数进行试验研究.结果表明:超滤以75L/(m2.h)恒流过滤45min后进行水力反洗,'正洗+反洗+正洗'为最佳水力反洗方式,第1次正洗4s,反洗8s和第2次正洗8s时,冲洗水中粒径2μm以上的颗粒数达到峰值.超滤运行适宜的正洗1、反洗和正洗2的时间分别为10,10和25s.水力反洗趋于稳定时,冲洗水中2μm以上的颗粒数为472mL-1,其中15μm以上的颗粒数仅为9mL-1.反洗流量和超滤过滤流量的比值k应在2.0～2.5之间,超滤过滤时间与反洗时间的比值r控制在67.5以内,超滤水力反洗后跨膜压差可有效恢复.In order to optimize the working condition of ultrafiltration membrane, alleviate the mem- brane fouling and improve the rate of water product, tests were carried out to study the hydraulic cleaning method and operation parameters on transmembrane pressure recovery. The results show that the membrane filtration is performed at a constant flux of 75 L/（m2· h）, the membrane is back- washed after filtration 45 min. ＂Washing l q-bachwashingq-washing 2＂ is ensured for the optimum method of hydro-cleaning. Firstly washing 4 s, then backwashing 8 s, and lastly washing 8 s, particles with a diameter 〉2 /μm are the most in the washing water. The suitable washing time is 10 s washing, 10 s backwashing, and 25 s washing respectively. When the washing is end, particles with a diameter 〉2 /μm are 472 mL^（-1） and particles with a diameter 〉15 μm are only 9 mL^（-1）. The trans- membrane pressure can recovery after hydraulic cleaning, by the ratio k of backwashing flow and membrane filtration flow between 2.0 to 2.5, and the ratio r of membrane filtration time and back- washing time controlled within the 67.5.

关 键 词：超滤 跨膜压差 水力反洗 颗粒数 反洗流量 反洗频率 

分 类 号：TU991.1[建筑科学—市政工程]