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Minimizing residual aluminum concentration in treated water by tailoring properties of polyaluminum coagulants

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Title: Minimizing residual aluminum concentration in treated water by tailoring properties of polyaluminum coagulants
Authors: Kimura, Masaoki Browse this author
Matsui, Yoshihiko Browse this author →KAKEN DB
Kondo, Kenta Browse this author
Ishikawa, Tairyo B. Browse this author
Matsushita, Taku Browse this author →KAKEN DB
Shirasaki, Nobutaka Browse this author
Keywords: Basicity
Monomer Al
Issue Date: 15-Apr-2013
Publisher: Elsevier
Journal Title: Water Research
Volume: 47
Issue: 6
Start Page: 2075
End Page: 2084
Publisher DOI: 10.1016/j.watres.2013.01.037
PMID: 23422138
Abstract: Aluminum coagulants are widely used in water treatment plants to remove turbidity and dissolved substances. However, because high aluminum concentrations in treated water are associated with increased turbidity and because aluminum exerts undeniable human health effects, its concentration should be controlled in water treatment plants, especially in plants that use aluminum coagulants. In this study, the effect of polyaluminum chloride (PACl) coagulant characteristics on dissolved residual aluminum concentrations after coagulation and filtration was investigated. The dissolved residual aluminum concentrations at a given coagulation pH differed among the PACls tested. Very-high-basicity PACl yielded low dissolved residual aluminum concentrations and higher natural organic matter (NOM) removal. The low residual aluminum concentrations were related to the low content of monomeric aluminum (Ala) in the PAC. Polymeric (Alb)/colloidal (Alc) ratio in PAC did not greatly influence residual aluminum concentration. The presence of sulfate in PACl contributed to lower residual aluminum concentration only when coagulation was performed at around pH 6.5 or lower. At a wide pH range (6.5-8.5), residual aluminum concentrations <0.02 mg/L were attained by tailoring PACl properties (Ala percentage <= 0.5%, basicity >= 85%). The dissolved residual aluminum concentrations did not increase with increasing the dosage of high-basicity PAC, but did increase with increasing the dosage of normal-basicity PAC. We inferred that increasing the basicity of PAC afforded lower dissolved residual aluminum concentrations partly because the high-basicity PACls could have a small percentage of Ala, which tends to form soluble aluminum-NOM complexes with molecular weights of 100 kDa-0.45 mu m. (C) 2013 Elsevier Ltd. All rights reserved.
Type: article (author version)
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)

Submitter: 松井 佳彦

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