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Effect of pre-coagulation using different aluminium species on crystallization of cake layer and membrane fouling
Yu, Wenzheng; Liu, Mengjie; Zhang, Xuejia; Graham, Nigel; Qu, Jiuhui
2019-08-14
Source PublicationNPJ CLEAN WATER
ISSN2059-7037
Volume2Pages:-
AbstractPre-coagulation could mitigate the membrane fouling, and thus we used different Al coagulants as a pre-treatment for ultrafiltration to explore their effects on the morphology of the membrane cake layer and fouling. Parallel bench-scale tests, using three different species of Al (AlCl3, PACl(15), and PACl(25)), with and without humic acid, were operated continuously for a long period to investigate the effects of floc aging (similar to 13 days). Specifically, the presence of humic acid affects the cake layer by influencing the rate and extent of floc crystallization, as greater crystallization leads to greater fouling (bio-fouling was excluded in this study). The fouling rate (indicated by the trans-membrane pressure at constant flux) varied with Al species and was found to increase as follows: PACl(15) < PACl(25) < AlCl3. The presence of humic acid also intensify membrane flouling. The results showed that three species of Al induced different sizes of primary nanoparticles and fractal dimensions of flocs, and therefore produced cake layers with different thickness/structure. Analysis of flocs with different ages indicated a crystallization process in the cake layer. Crystallization exacerbate membrane fouling by decreasing the porosity of the cake layer, and the situation became severe in the presence of humic acid.
Department中国科学院饮用水科学与技术重点实验室
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43443
Collection中国科学院饮用水科学与技术重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China
2.Imperial Coll London, Dept Civil & Environm Engn, South Kensington Campus, London SW7 2AZ, England
Recommended Citation
GB/T 7714
Yu, Wenzheng,Liu, Mengjie,Zhang, Xuejia,et al. Effect of pre-coagulation using different aluminium species on crystallization of cake layer and membrane fouling[J]. NPJ CLEAN WATER,2019,2:-.
APA Yu, Wenzheng,Liu, Mengjie,Zhang, Xuejia,Graham, Nigel,&Qu, Jiuhui.(2019).Effect of pre-coagulation using different aluminium species on crystallization of cake layer and membrane fouling.NPJ CLEAN WATER,2,-.
MLA Yu, Wenzheng,et al."Effect of pre-coagulation using different aluminium species on crystallization of cake layer and membrane fouling".NPJ CLEAN WATER 2(2019):-.
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