浊度对腐植酸分子的竞争吸附对膜污染的影响  

COMPETITIVE ADSORPTION OF HUMIC ACID ONTO TURBIDITY AND MEMBRANE INFLUENCES MEMBRANE FOULING

作　　者：王磊[1] 张偲豪 苗瑞[1] 王旭东[1] 黄丹曦[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《水处理技术》2014年第10期24-27,31,共5页Technology of Water Treatment

基　　金：国家自然科学基金项目(51178378;51278408);陕西省科技统筹创新工程计划项目(2012KTCL03-06);陕西省教育厅专项(2013JK0884)

摘　　要：为了解析浊度与腐植酸共存时的超滤膜污染行为,分别进行了浊度、腐植酸及浊度-腐植酸共混溶液的膜污染实验,使用原子力显微镜结合自制膜材料探针和污染物探针定量测定了不同浊度、腐植酸比共混污染物与膜及浊度-腐植酸之间的微观作用力,并系统考察了不同污染膜的表面形貌特点。结果表明,浊度物质-腐植酸之间的力明显大于腐植酸-膜之间的作用力,使得浊度物质与腐植酸共存时,腐植酸分子优先吸附在浊度物质表面,降低了其与膜的接触机率。且浊度物质的尺寸远远大于所使用超滤膜的平均孔径,所以浊度物质对腐植酸的优先吸附使得腐植酸进入膜孔内的机率减小,相应的膜污染减轻。此外,与腐植酸污染膜相比,浊度-腐植酸污染膜表面的污染层结构较为疏松。For better understanding the fouling behavior of ultrafiltration membrane by the mixtures of turbidity material and humic acid（HA）, fouling experiments with turbidity water, HA and turbidity/HA mixtures were carried out with PVDF ultrafiltration membranes. Besides the surface morphology of clean and fouled-membranes, the adhesion forces of turbidity/HA mixtures-membrane and HA-turbidity were measured by atomic force microscopy（AFM） in conjunction with self-made membrane material and foulant-coated probe, respectively. Results show that the turbidity-HA interaction force was significantly stronger than PVDF-HA interaction force, suggests that the HA was adsorbed preferentially on the surface of turbidity, which reduced the risk of HA contact with membrane. Upon considering the size of turbidity material was much larger than the average pore size of the ultrafiltration membrane,the preferential adsorption of humic acid on the surface of turbidity material reduced the risk of HA pass into membrane pores, and membrane fouling was mitigated. Moreover, the HA-fouled membrane surface looks more compact than that for HA/turbidity mixture-fouled membrane.

关 键 词：浊度 腐植酸 超滤膜污染 微观作用力 

分 类 号：TQ028.8[化学工程]