Influence of sedimentation with pre-coagulation on ultrafiltration membrane fouling performance

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 sedimentation with pre-coagulation on ultrafiltration membrane fouling performance
	Ma, Baiwen; Ding, Yanyan; Wang, Bodong; Qi, Zenglu; Bai, Yaohui; Liu, Ruiping; Liu, Huijuan; Qu, Jiuhui
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2020-03-15
卷号	708 页码:1-17
关键词	Ultrafiltration Traditional filtration Direct filtration Sedimentation Fouling behavior
ISSN号	0048-9697
英文摘要	Coagulation plays an important role in effectively alleviating ultrafiltration (UF) membrane fouling due to the existence of flocs. In comparison to traditional filtration, direct filtration (no sedimentation tank) is generally considered to result in less membrane fouling due to the looser cake layer formed on the membrane surface. However, cake layer characteristics are easily influenced by operating conditions (e.g., sedimentation time, temperature), resulting in different fouling loads and the still very limited knowledge about the fouling behavior. Here, a detailed investigation of UF membrane performance was carried out to analyze the differences between traditional filtration and direct filtration. The results showed that a critical settling time indeed existed when flocs gradually settled, leading to severe membrane fouling induced by a dense and thick cake layer. Therefore, the traditional filtration performed worse when the settling time was shorter than the critical time, while it performed better when the settling time was longer. In comparison to room temperature water, the proportion of membrane fouling caused by the cake layer increased at low water temperature due to the contracted membrane pore size, and the cake layer thickness became the main fouling load. The longer the settling time, the fewer pollutants reached the membrane surface, the thinner the cake layer, and the lower the potential for membrane fouling. Thus, traditional filtration performed better than direct filtration, and the critical settling time was not obvious. Although solution pH played an important role in floc properties, the fouling load was influenced little and traditional filtration still performed better. This work shows that the cake layer properties/fouling loads vary with the settling time during the coagulation-UF process, and this finding is of great significance to the improvement of membrane technology in drinking water plants. (C) 2019 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/45315]
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,Ding, Yanyan,Wang, Bodong,et al. Influence of sedimentation with pre-coagulation on ultrafiltration membrane fouling performance[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,708:1-17.
APA	Ma, Baiwen.,Ding, Yanyan.,Wang, Bodong.,Qi, Zenglu.,Bai, Yaohui.,...&Qu, Jiuhui.(2020).Influence of sedimentation with pre-coagulation on ultrafiltration membrane fouling performance.SCIENCE OF THE TOTAL ENVIRONMENT,708,1-17.
MLA	Ma, Baiwen,et al."Influence of sedimentation with pre-coagulation on ultrafiltration membrane fouling performance".SCIENCE OF THE TOTAL ENVIRONMENT 708(2020):1-17.