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Characteristics and components of poly-aluminum chloride coagulants that enhance arsenate removal by coagulation: Detailed analysis of aluminum species
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| Title: | Characteristics and components of poly-aluminum chloride coagulants that enhance arsenate removal by coagulation: Detailed analysis of aluminum species |
| Authors: | Matsui, Yoshihiko Browse this author →KAKEN DB | | Shirasaki, Nobutaka Browse this author | | Yamaguchi, Takuro Browse this author | | Kondo, Kenta Browse this author | | Machida, Kaori Browse this author | | Fukuura, Taiga Browse this author | | Matsushita, Taku Browse this author →KAKEN DB |
| Keywords: | PACl | | Basicity | | Arsenic | | Ferron | | NMR |
| Issue Date: | Jul-2017 |
| Publisher: | Elsevier |
| Journal Title: | Water Research |
| Volume: | 118 |
| Start Page: | 177 |
| End Page: | 186 |
| Publisher DOI: | 10.1016/j.watres.2017.04.037 |
| Abstract: | We evaluated 51 poly-aluminum chloride (PACl) coagulants to determine the coagulant characteristics that were responsible for effective arsenate removal from contaminated river water by means of experiments involving coagulation, settling, and microfiltration. Some of the high-basicity PACls exhibited high arsenate removal percentages, particularly under alkaline conditions, and we investigated various relevant properties and characteristics of these high-basicity PACls. Effective arsenate removal was correlated with the content of polymeric and colloidal aluminum species (Alb and Alc) in the PACls but was not well correlated with colloid charge or zeta potential. Multiple regression analysis revealed that a portion of Alb and Alc, which reacted with the ferron reagent during the period from 30 min to 3 h, that is, the (Al30min−3hAl30min−3h) fraction, had the highest arsenate sorption capacity, followed by a colloidal aluminum fraction (Al>3hAl>3h, which reacted with ferron at a time of >3 h). The Al30min−3hAl30min−3h fraction was stable, and its arsenate sorption capacity did not decrease markedly with increasing pH. The Al30min−3hAl30min−3h fraction did not correspond to the Keggin-type e-Al13 polycation or the δ-Al30 polycation; it is likely to be an aluminum polymer that is unobservable by 27Al NMR spectroscopy. Our results suggest that PACls with a high proportion of the Al30min−3hAl30min−3h fraction should be used for enhanced arsenate removal by coagulation. A high content of the e-Al13 polycation or the δ-Al30 polycation was not indispensable for effective arsenate removal. |
| Rights: | © 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/74829 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 松井 佳彦
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