工业循环水膜蒸馏过程中的膜污染控制方法研究  

MEMBRANE FOULING CONTROL METHOD IN MEMBRANE DISTILLATION PROCESS FOR INDUSTRIAL CIRCULATING WASTEWATER TREATMENT

作　　者：刘杨[1] 高薇[1] 武春瑞[1] 吕晓龙[1] 

机构地区：[1]中空纤维膜材料与膜过程国家重点实验室培育基地,天津工业大学生物化工研究所,天津300160

出　　处：《水处理技术》2012年第12期65-69,共5页Technology of Water Treatment

基　　金：国家基金项目(21176188,21106100);天津市应用基础及前沿技术研究计划(09JCZDJC26300,11JCYBJC04700);高等学校博士学科点专项科研基金(20111201110004);天津市科技兴海项目(KX2010-0010)

摘　　要：针对膜蒸馏法工业循环水处理过程中的膜通量衰减及污染问题,将鼓气强化及废水的化学处理方法引入到膜蒸馏处理过程中,研究了2者对膜蒸馏过程性能及膜污染的影响。结果表明,利用减压膜蒸馏(VMD)过程直接处理该废水,初始通量为17.6 kg/(m2.h),浓缩至5倍时,通量衰减至8.5 kg/(m2.h);采用鼓气强化减压膜蒸馏(AVMD),初始通量为26.1 kg/(m2.h),浓缩至4.8倍时,通量仍保持在19.8 kg/(m2.h);原水经化学处理后,VMD过程初始通量为19.2 kg/(m2.h),浓缩至5倍时通量为17.7 kg/(m2.h)。膜蒸馏通量衰减及膜面扫描电镜照片均表明,化学处理及鼓气强化方法可有效缓解膜蒸馏过程的膜污染。To control the membrane fouling in membrane distillation process for the treatment of industrial circulating wastewater, chemical pretreatment and air-bubbling strengthen method were introduced into vacuum membrane distillation （VMD） process. The effect of the two techniques on membrane distillation performance and membrane fouling were studied. The results showed that the initial flux of VMD process for the wastewater was 17.6 kg/（m^2·h） and declined to 8.5 kg/（m^2·h） as the concentration multiple of the wastewater got 5. When the wastewater was pretreated by chemical method, the initial flux of VMD process was 19.2 kg/（m^2·h） and declined to 17.7 kg/（m^2·h） as it was concentrated to 5 times. When air-bubbling method was introduced into VMD＇process, the initial flux reached 26.1 kg/（m^2·h） and kept still higher than 19.8 kg/（m^2·h） when the concentration multiple was 4.8. The flux declination trend and scanning electrical micrograph of the membranes used in these experiments testified that chemical pretreatment and air-bubbling method can reduce membrane fouling during the wastewater treating process by membrane distillation method.

关 键 词：减压膜蒸馏 工业循环冷却水 膜污染 聚偏氟乙烯疏水膜 鼓气强化 

分 类 号：TQ028.8[化学工程]