海藻酸及腐殖酸共存对PVDF超滤膜的污染行为

中国环境科学2014，34(10)：2568-2574ChinaEnvironmenta1Science海藻酸及腐殖酸共存对PVDF超滤膜的污染行为苗瑞，王磊’，田丽，王旭东，吕永涛，张静怡(西安建筑科技大学环境与市政工程学院，陕西西安710055)摘要：为了揭示有机物对PVDF超滤膜的污染行为，选用典型亲／疏水性有机污染物海藻酸(SA)及腐殖酸(HA)，采用原子力显微镜结合自制的PVDF膜材料探针和污染物探针定量测定了PVDF一污染物及污染物一污染物间的作用力，并进行PVDF膜污染试验和污染物去除效果分析．结果表明：亲水性SA—PVDF及SA—SA之间的作用力皆大于疏水性HA—PVDF及HA—HA间的作用力，且SA污染膜的通量衰减速率与衰减幅度明显大于HA污染膜，说明了亲水性有机物是引起PVDF超滤膜污染的优势污染物HA／SA混合污染物试验表明，膜污染行为与混合污染物中优势污染物的含量密切相关；与单种污染物的膜污染行为相比，混合污染物间不存在明显的协同作用促进膜污染．此外，污染物的去除率与相应微观作用力大小及膜污染速率成正相关关系．关键词：PVDF超滤膜；膜污染；海藻酸；腐殖酸；微观作用力中图分类号：X703．1文献标识码：A文章编号：1000—6923f2014)l0—2568一O7InvestigatingfoulingbehaviourofPVDFultrafiltrafionmembranesforalginate／humicacidmixtures．MIAORui，WANGLei，T1ANEi,WANGXu-dong,LUYong-tao，ZHANGJing-yi(schoolofEnvironmentalandMunicip~Engineerin~Xi’anUniversityofArchitectureandTechnology,Xi’all710055，China)．ChinaEnvironmentalScience,2014，34(9)：2568-2574Abstract：To~therunraveltheorganicfoulingbehaviorofpolyvinylidenefluoride(PVDF)ultrafiltration(UF)membranes，typicalhydrophilicandhydrophobicorganicmatterssodiumalginate(SA)andhumicacid(HA)werechosenasmodelfoulants．Theadhesionforcesofmembrane-foulantandfoulant-foulantwereinvestigatedbyatomicforcemicroscopyinconjunctionwithsel~madePVDFprobeandfoulant-coatedprobe，respectively．Besides，theremovalrateofdissolvedorganiccarbon，foulingexperimentswithSA，HAandHA／SAmixtureswerecarriedoutwithPVDFUFmembranes．ResultsshowthatSA-PVDFandSA-SAinteractionforceswerestrongerthanHA-PVDFandHA—HAinteractionforces．respectivelyThisphenomenon．coniunctionwiththefactthatthefluxdeclinerateandextentofSA．fouledmembraneweremoreseriousthanthatforHA-fouledmembrane．suggeststhatthehydrophilicorganicmaterswerethedominantmatersresponsibleformembranefouling．TheexperimentsresultswithHA／SAmixturesshowthatthefoulingbehaviorofHA／SAmixtureswerecloselyrelatedtotheSApercentageinthemixture．Comparedwithsinglespeciefoulant，therewerenosignificantsynergisticefectsfromHAandSAtoenhancemembranefouling．Moreover,thereWasapositivecorrelationbetweentheremovalrateoffoulantsandcorrespondingin