期刊
CHEMICAL ENGINEERING JOURNAL
卷 262, 期 -, 页码 1161-1167出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2014.10.078
关键词
Al species; Coagulation performance; Coagulation/ultrafiltration; Membrane fouling
资金
- National Natural Science Foundation of China [21377071]
Three species of aluminum coagulants mainly consist of mononuclear Al species (Al-a), medium polymeric species (Al-b) and colloidal species (Al-c) were prepared, separated and purified by organic solvent precipitation method. The effect of different Al species on coagulation performance and membrane fouling were investigated through the coagulation-ultrafiltration hybrid process. The influence of flocs characteristics were also studied to build the relation model between Al species coagulation and membrane fouling mechanisms. The results showed different Al species combined with humic acid (HA) in diverse ways feature distinct floc properties and membrane fouling. Al-a coagulant had better UV254 and dissolved organic carbon (DOC) removal efficiency. Furthermore, Ala and Ale were beneficial to form larger flocs with lower strength and looser structure, whereas Alb was prone to form small flocs with higher strength and compact structure. Ultrafiltration experiments indicated that Alb is the most effective Al species to alleviate membrane fouling. (C) 2014 Elsevier B.V. All rights reserved.
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