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Micro-milling of spent granular activated carbon for its possible reuse as an adsorbent: Remaining capacity and characteristics
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| Title: | Micro-milling of spent granular activated carbon for its possible reuse as an adsorbent: Remaining capacity and characteristics |
| Authors: | Pan, Long Browse this author | | Takagi, Yuichi Browse this author | | Matsui, Yoshihiko Browse this author →KAKEN DB | | Matsushita, Taku Browse this author →KAKEN DB | | Shirasaki, Nobutaka Browse this author |
| Keywords: | 2-Methylisoborneol | | Iodine number | | SPAC | | Used carbon |
| Issue Date: | May-2017 |
| Publisher: | Elsevier |
| Journal Title: | Water research |
| Volume: | 114 |
| Start Page: | 50 |
| End Page: | 58 |
| Publisher DOI: | 10.1016/j.watres.2017.02.028 |
| Abstract: | We milled granular activated carbons (GACs) that had been used for 0-9 years in water treatment plants and produced carbon particles with different sizes and ages: powdered activated carbons (PAC, median diameter 12-42 mu m), superfine PAC (SPAC, 0.9-3.5 mu m), and submicron-sized SPAC (SSPAC, 220 290 nm). The fact that SPAC produced from 1-year-old GAC and SSPAC from 2-year-old GAC removed 2-methylisoborneol (MIB) from water with an efficiency similar to that of virgin PAC after a carbon contact time of 30 min suggests that spent GAC could be reused for water treatment after being milled. This potential for reuse was created by increasing the equilibrium adsorption capacity via reduction of the carbon particle size and improving the adsorption kinetics. During long-term (>1 year) use in GAC beds, the volume of pores in the carbon, particularly pores with widths of 0.6-0.9 nm, was greatly reduced. The equilibrium adsorption capacities of the carbon for compounds with molecular sizes in this range could therefore decrease with increasing carbon age. Among these compound's, the decreases of capacities were prominent for hydrophobic compounds, including MIB. For hydrophobic compounds, however, the equilibrium adsorption capacities could be increased with decreasing carbon particle size. The iodine number, among other indices, was best correlated with the equilibrium adsorption capacity of the MIB and would be a good index to assess the remaining MIB adsorption capacity of spent carbon. Spent GAC can possibly be reused as SPAC or SSPAC if its iodine number is >= 600 mg/g. |
| Rights: | ©2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/73814 |
| 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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