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NF membrane fouling by aluminum and iron coagulant residuals after coagulation-MF pretreatment
| 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 | | Microfiltration | | Poly-aluminum chloride | | Ceramic membrane | | Silicate | | Potassium |
| 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) |
| URI: | http://hdl.handle.net/2115/42974 |
| 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: 大野 浩一
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