典型污染物对膜蒸馏过程膜污染的影响  

EFFECT OF REPRESENTATIVE FOULANTS TO MEMBEANE FOULINF IN MEMBRANE DISTILLATION

作　　者：代婷[1] 武春瑞[1] 吕晓龙[1] 王暄[1] 林芳卉[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8期9-14,共6页Technology of Water Treatment

基　　金：国家基金项目(21176188;21106100);高等学校博士学科点专项科研基金项目(20091208110003);天津市应用及前沿技术研究计划(09JCZDJC26300;11JCYBJC04700);天津市高校科技发展基金计划项目(20080507)

摘　　要：选取腐殖酸、卵清蛋白、硅溶胶、碳酸钙等作为实际水体中典型污染物配制原水,以实验室自制的聚偏氟乙烯中空纤维膜对配制的污染物原水进行膜蒸馏试验。通过监测通量的衰减及产水侧水质的变化考察不同污染物及污染物复配体系对膜蒸馏性能的影响。结果表明,膜蒸馏操作初期,有机质、胶体等在钙离子的作用下形成污染物聚集,加速过程通量的衰减并沉积在膜材料表面。对于有机类污染物,钙离子通过与有机类污染物分子上的官能团相互作用,络合有机质从而形成污染物聚集体;对于胶体类污染物,钙离子通过削弱两胶体粒子间的排斥作用促成胶体粒子的聚合,形成胶体类污染物聚集体,而钙离子并不构成胶体类污染物聚集体的化学组成。In direct contact membrane distillation （DCMD） process, humic acid, ovalbumin, reactive silica （SiO2） and calcium carbonate （CaCO3） were selected as representative foulants exist in real water. Influences to MD performances of foulants or foulant complexes were studied by detecting MD and feed property variations during DCMD manipulations. Results showed foulant aggregations because of Ca2＋ should be taken into account for explaining the severe flux decline and the scale deposition. For the foulant aggregations affected MD efficiencies, and the counter ions Ca2＋ facilitated this aggregation formation. Mechanisms of aggregation formation for both DOM and colloidal particles were distinguished by the contribution of Ca~： DOM aggregations were due to the formation of complexes through Ca2＋ and functional groups bridging, and for colloidal aggregations, Ca2~ did not partake in chemical structure of the deposit, it appeared that they just ＂~atalyzed＂ monomeric silica polymerization.

关 键 词：膜蒸馏 膜污染 腐植酸 卵清蛋白 硅溶胶 污染物聚集体 

分 类 号：TQ028.8[化学工程]