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AWWA WQTC65895
- Removal of 2-methylisoborneol and Geosmin with High-Silica Zeolites
- Conference Proceeding by American Water Works Association, 11/01/2007
- Publisher: AWWA
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Single-solute batch experiments were conducted in ultrapure water to identifythe characteristics of high-silica zeolites that are most suitable for the adsorptive removalof MIB and geosmin. In addition, the effectiveness of zeolites was compared to one coal-basedand one coconut-shell-based activated carbon. Among the tested high-silicazeolites, adsorbents of the mordenite framework type exhibited the largest MIBadsorption capacity while both mordenite and Y zeolites were effective for geosminadsorption. Adsorption capacities of the tested high-silica zeolites were smaller thanthose of the tested activated carbons in ultrapure water for both MIB and geosmin. Withrespect to zeolite hydrophobicity, results for both MIB and geosmin showed thatadsorption capacities increased as the SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio (hydrophobicity) increased from20 to 90 while a further increase in SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio did not enhance MIB and geosminadsorption capacities. Also, differences between 14C removal in experiments conductedwith 14C-labelled MIB and 12C-MIB removal suggest that MIB may be removed by areactive mechanism on some zeolites. Includes 4 references, tables, figures.
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