Characteristics and components of poly-aluminum chloride coagulants that enhance arsenate removal by coagulation: Detailed analysis of aluminum species

Matsui, Yoshihiko; Shirasaki, Nobutaka; Yamaguchi, Takuro; Kondo, Kenta; Machida, Kaori; Fukuura, Taiga; Matsushita, Taku

Characteristics and components of poly-aluminum chloride coagulants that enhance arsenate removal by coagulation: Detailed analysis of aluminum species

Matsui, Yoshihiko; Shirasaki, Nobutaka; Yamaguchi, Takuro et al.

Water Research, 2017, 118, 177-186

Permalink : https://hdl.handle.net/2115/74829

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アクセス権	open access
URI	https://hdl.handle.net/2115/74829
タイトル	Characteristics and components of poly-aluminum chloride coagulants that enhance arsenate removal by coagulation: Detailed analysis of aluminum species
著者	Matsui, Yoshihiko ; Shirasaki, Nobutaka ; Yamaguchi, Takuro ; Kondo, Kenta ; Machida, Kaori ; Fukuura, Taiga ; Matsushita, Taku
e-Rad_Researcher 00173790 著者名 Matsui, Yoshihiko
著者名 Shirasaki, Nobutaka
著者名 Yamaguchi, Takuro
著者名 Kondo, Kenta
著者名 Machida, Kaori
著者名 Fukuura, Taiga
e-Rad_Researcher 30283401 著者名 Matsushita, Taku
言語	英語
キーワード	PACl
	Basicity
	Arsenic
	Ferron
	NMR
発行日	2017-07
出版者	Elsevier
収録物名	Water Research
巻(号)	118
ページ	177-186
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
PISSN	0043-1354
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.watres.2017.04.037