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Geosmin and 2-methylisoborneol removal using superfine powdered activated carbon: Shell adsorption and branched-pore kinetic model analysis and optimal particle size
| Title: | Geosmin and 2-methylisoborneol removal using superfine powdered activated carbon: Shell adsorption and branched-pore kinetic model analysis and optimal particle size |
| Authors: | Matsui, Yoshihiko Browse this author →KAKEN DB | | Nakao, Soichi Browse this author | | Taniguchi, Takuma Browse this author | | Matsushita, Taku Browse this author |
| Keywords: | Taste and odor | | Water treatment | | PAC | | SPAC | | Contact time |
| Issue Date: | 15-May-2013 |
| Publisher: | Elsevier |
| Journal Title: | Water Research |
| Volume: | 47 |
| Issue: | 8 |
| Start Page: | 2873 |
| End Page: | 2880 |
| Publisher DOI: | 10.1016/j.watres.2013.02.046 |
| PMID: | 23528781 |
| Abstract: | 2-Methylisoborneol (MIB) and geosmin are naturally occurring compounds responsible for musty-earthy taste and odor in public drinking-water supplies, a severe problem faced by many utilities throughout the world. In this study, we investigated adsorptive removal of these compounds by superfine powdered activation carbon (SPAC, particle size <1 mu m) produced by novel micro-grinding of powdered activated carbon; we also discuss the optimization of carbon particle size to efficiently enhance the adsorptive removal. After grinding, the absorptive capacity remained unchanged for a 2007 carbon sample and was increased for a 2010 carbon sample; the capacity increase was quantitatively described by the shell adsorption model, in which MIB and geosmin adsorbed more in the exterior of a carbon particle than in the center. The extremely high uptake rates of MIB and geosmin by SPAC were simulated well by a combination of the branched-pore kinetic model and the shell adsorption model, in which intraparticle diffusion through macropores was followed by diffusion from macropore to micropore. Simulations suggested that D-40 was on the whole the best characteristic diameter to represent a size-disperse group of adsorbent particles; D-40 is the diameter through which 40% of the particles by volume pass. Therefore, D-40 can be used as an index for evaluating the improvement of adsorptive removal that resulted from pulverization. The dose required for a certain percentage removal of MIB or geosmin decreased linearly with carbon particle size (D-40), but the dose reduction became less effective as the activated carbon was ground down to smaller sizes around a critical value of D-40. For a 60-min contact time, critical D-40 was 2-2.5 mu m for MIB and 0.4-0.5 mu m for geosmin. The smaller critical D40 was when the shorter the carbon-water contact time was or the slower the intraparticle mass transfer rate of an adsorbate was. (C) 2013 Elsevier Ltd. All rights reserved. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/52884 |
| 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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