有机大分子对聚酰胺复合纳滤膜偏硅酸钠污染的影响

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Abstract

The polyamide composite nanofiltration membrane fouling experiments were carried out by using humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) as model organic macromoleculars, sodium metasilicate as model inorganic foulant in natural water. The adhesion forces of membrane-sodium metasilicate and sodium metasilicate-sodium metasilicate under different conditions were tested by atomic force microscopy (AFM) in conjunction with self-made colloidal probe. The surface structural characteristics of the fouled membranes and flux recovery rates of the corresponding fouled membranes were analyzed. Besides, the effects of different membrane surface conditions on silicate scaling behavior were investigated. The results showed that the negative potential of the membrane surface increased after adsorption of HA or SA on membrane surface. Hence, the electrostatic repulsion between the membrane and sodium metasilicate increased. Therefore, the binding capacity between fouled membrane and sodium metasilicate was weakened and the scaling behavior was mitigated. However, compared with the membrane without organic conditioning, adsorption of BSA on the membrane surface had little influence on silicate scaling of nanofiltration membrane owing to the similar negative potentials of the two kinds of membranes.

Key words： polyamide composite nanofiltration membrane organic macromolecular sodium metasilicate membrane fouling adhesion force

Received: 10 July 2015

PACS:

X703.1

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	ZHANG Xiao-ting
	WANG Lei
	YANG Ruo-song
	WANG Jia-xuan

Cite this article:

ZHANG Xiao-ting,WANG Lei,YANG Ruo-song等. Effects of organic macromolecular on sodium metasilicate fouling behavior of polyamide composite nanofiltration membrane[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(2): 460-467.

URL:

http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I2/460

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