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NF membrane fouling by aluminum and iron coagulant residuals after coagulation-MF pretreatment

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Title: NF membrane fouling by aluminum and iron coagulant residuals after coagulation-MF pretreatment
Authors: Ohno, Koichi Browse this author
Matsui, Yoshihiko Browse this author →KAKEN DB
Itoh, Masaki Browse this author
Oguchi, Yoshifumi Browse this author
Kondo, Takuya Browse this author
Konno, Yosuke Browse this author
Matsushita, Taku Browse this author →KAKEN DB
Magara, Yasumoto Browse this author →KAKEN DB
Keywords: Nanofiltration
Poly-aluminum chloride
Ceramic membrane
Issue Date: 15-May-2010
Publisher: Elsevier
Journal Title: Desalination
Volume: 254
Issue: 1-3
Start Page: 17
End Page: 22
Publisher DOI: 10.1016/j.desal.2009.12.020
Abstract: The effects of coagulant residuals on fouling of a nanofiltration (NF) membrane were investigated. Experiments were carried out with a laboratory-scale microfiltration (MF)-NF setup and a pilot MF-NF plant. In the laboratory-scale experiments, NF feed water was pretreated with poly-aluminum chloride (PACl) or alum followed by MF. NF membrane permeability declined when the feed water contained residual aluminum at 18 μg/L or more, but not when it was lower than 9 μg/L. When pretreated with ferric chloride, no substantial decline of NF membrane permeability was observed: residual iron did not affect the permeability. When SiO2 was added to the water before the pretreatment with PACl, the NF membrane permeability declined at about double the speed. Thermodynamic calculations and elemental analysis of foulants recovered from the membranes indicated that the majority of inorganic foulants were compounds composed of aluminum, silicate, and possibly potassium. In the pilot plant, NF feed was pretreated by PACl. Transmembrane pressure for NF doubled over 4.5 months of operation. Although the aluminum concentration in the NF feed was not high (30 μg/L), analysis of membrane foulants revealed excessive accumulation of aluminum and silicate, also suggesting that aluminum residuals caused the membrane fouling by alumino-silicates or aluminum hydroxide.
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: 大野 浩一

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