PVDF复合膜在循环冷却排污水回用处理中的应用  

APPLICATION OF PVDF COMPOSITE MEMBRANCE FOR THE REUSE OF RECIRCULATING COOLING SEWAGE TREATMENT

作　　者：李福勤[1,2] 吕晓龙[1] 

机构地区：[1]天津工业大学生物化工学研究所,天津300160 [2]河北工程大学城建学院,邯郸056038

出　　处：《能源环境保护》2012年第6期32-35,共4页Energy Environmental Protection

基　　金：国家自然科学基金21176188无级多效膜蒸馏过程研究;国家自然科学基金青年基金21106100基于两相流原理的膜蒸馏过程鼓气强化方法与机理研究;高等学校博士学科点专项科研基金;20111201110004表面仿生微纳米结构超疏水微孔膜的研制及性能;河北省科学技术研究与发展计划项目11215116D新型膜材料和膜蒸馏组件的制备及其应用研究

摘　　要：采用自制PVDF亲水/疏水性复合膜,对循环冷却排污水回用处理进行真空膜蒸馏实验。结果表明:膜通量随原水温度和冷侧真空度提高而明显上升,在原水温度70℃、冷侧真空度0.09 MPa、料液流速4 cm/s条件下,膜通量达到19.65 L/(m2.h);原水温度、冷侧真空度对产水电导率影响较小,系统的产水电导率稳定在5μS/cm左右,除盐率保持在99.8%以上;随着浓缩倍数的增加,膜通量逐渐降低,产水电导率有所上升;采用药剂软化预处理,有利于提高膜通量和高浓缩倍数下的稳定运行;自制PVDF复合膜表面疏水性(接触角130°)强,膜通量大,产水水质优良、机械强度(爆破强度0.54 MPa,抗拉强度26.8 MPa)大,用于循环冷却排污水回用处理中实用性较强。The vacuum expriment was conducted for the reuse of recirculating cooling sewage by using the self-made PVDF hydrophilic/hydrophobic composite membrane. The results show that the permeation flux rose obviously with the increase of raw water temperature and the cold side＇s vacuum degree. On the conditions of the raw water temperature of 70℃, the cold side＇s vacuum degree of 0.09Mpa and the feed rate of 4 cm/s, the permeation flux reached to 19.65L/（m2.h）. The influence of raw water temperature and the colod side＇s vacuum degree to the conductivity of effluent was less, with the stable conductivity of about 5 5μS/cm, and the rate of distillation of above 99.8%. Along with the increase of concentration ratio, permeation flux become lower and lower, and the distillate conductivity become a little higher than before. The pretreatment of elixir softening can improve permeation flux and keep the system operated stably under a high concentration ratio. The self-made PVDF composite membrane has the characteristics of strong hydrophobicity （the contact angle of 130°）, high permeationflux, good water quality, strong mechanical strength （the blast intensity of 0.54MPa and the tensile strength of 26.8MPa）, and strong practicality in the reuse process of recirculating cooling sewage.

关 键 词：PVDF复合膜 循环冷却水 真空膜蒸馏 膜通量 机械强度 

分 类 号：X703[环境科学与工程—环境工程]