Influence of floc dynamic protection layer on alleviating ultrafiltration membrane fouling induced by humic substances

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院饮用水科学与技术重点实验室

	Influence of floc dynamic protection layer on alleviating ultrafiltration membrane fouling induced by humic substances
	Ma, Baiwen; Wu, Siqi; Wang, Bodong; Qi, Zenglu; Bai, Yaohui; Liu, Huijuan; Qu, Jiuhui; Wu, Ruijun
刊名	JOURNAL OF ENVIRONMENTAL SCIENCES
	2020-04
卷号	90 页码:10-19
关键词	Ultrafiltration Floc dynamic protection layer Humic substances Fouling alleviation
ISSN号	1001-0742
英文摘要	Cake layer formation is inevitable over time for ultrafiltration (UF) membrane-based drinking water treatment. Although the cake layer is always considered to cause membrane fouling, it can also act as a dynamic protection layer, as it further adsorbs pollutants and dramatically reduces their chance of getting to the membrane surface. Here, the UF membrane fouling performance was investigated with pre-deposited loose flocs in the presence of humic acid (HA). The results showed that the floc dynamic protection layer played an important role in removing HA. The higher the solution pH, the more negative the floc charge, resulting in lower HA removal efficiency due to the electrostatic repulsion and large pore size of the floc layer. With decreasing solution pH, a positively charged floc dynamic protection layer was formed, and more HA molecules were adsorbed. The potential reasons were ascribed to the smaller floc size, greater positive charge, and higher roughness of the floc layer. However, similar membrane fouling performance was also observed for the negative and positive floc dynamic protection layers due to their strong looseness characteristics. In addition, the molecular weight (MW) distribution of HA also played an important role in UF membrane fouling behavior. For the small MW HA molecules, the chance of forming a loose cake layer was high with a negatively charged floc dynamic protection layer, while for the large MW HA molecules it was high with a positively charged floc dynamic protection layer. As a result, slight UF membrane fouling was induced. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45314]
专题	生态环境研究中心_中国科学院饮用水科学与技术重点实验室
推荐引用方式 GB/T 7714	Ma, Baiwen,Wu, Siqi,Wang, Bodong,et al. Influence of floc dynamic protection layer on alleviating ultrafiltration membrane fouling induced by humic substances[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,90:10-19.
APA	Ma, Baiwen.,Wu, Siqi.,Wang, Bodong.,Qi, Zenglu.,Bai, Yaohui.,...&Wu, Ruijun.(2020).Influence of floc dynamic protection layer on alleviating ultrafiltration membrane fouling induced by humic substances.JOURNAL OF ENVIRONMENTAL SCIENCES,90,10-19.
MLA	Ma, Baiwen,et al."Influence of floc dynamic protection layer on alleviating ultrafiltration membrane fouling induced by humic substances".JOURNAL OF ENVIRONMENTAL SCIENCES 90(2020):10-19.