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题名: Modification of ultrafiltration membrane with iron/aluminum mixed hydrolyzed precipitate layer for humic acid fouling reduction
作者: Xie, Yiruiwen; Ma, Baiwen; Zhang, Xuehong; Liu, Huijuan; Qu, Jiuhui
刊名: DESALINATION AND WATER TREATMENT
出版日期: 2016-11
卷号: 57, 期号:54, 页码:26022-26030
关键词: Ultrafiltration ; Humic acid ; Fouling reduction ; Iron ; aluminum mixed flocs ; Pre-deposition
DOI: 10.1080/19443994.2016.1159991
部门归属: 中国科学院饮用水科学与技术重点实验室
英文摘要: Iron/aluminum mixed flocs were pre-deposited onto an ultrafiltration (UF) membrane surface to test their antifouling properties in the presence of humic acid (HA). Membranes modified with higher aluminum mole ratios in the mixture were more effective in controlling membrane fouling. Relatively strong adhesion was observed between the mixed flocs and the UF membrane used. The differences in the structure of the deposited layer were an important contributing factor for antifouling properties, which was significantly influenced by solution pH. Scanning electron microscopy showed that dense deposition layers were formed by small flocs at pH 6.0, while loose deposition layers were formed by large flocs at pH 8.0. Atomic force microscopy showed that the surface roughness of the deposition layer was much larger at pH 6.0 than that at pH 8.0. The corresponding positive charge of the mixed flocs was also higher at pH 6.0, resulting in stronger adsorption ability to the negatively charged HA molecules. These factors reduced the amount of HA getting to the membrane surface and thus helped increase membrane flux at lower pH values. In addition, HA molecules with various molecular weights were removed much faster at pH 6.0 than at pH 8.0.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36199
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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