Removal of odorous aldehydes by UV/H2O2 was compared to removal of geosmin and 2-MIB by the same process. Odour transformation was investigated by sensory test and by-products were monitored by a carbonyl derivatization method. Heptadienal, decadienal and nonadienal were removed faster than geosmin and 2-MIB. The primary mechanism was the direct UV photolysis in the UV/H2O2 process. In sensory tests, new odours such as chalky or sweet odours were produced while the initial odour intensity of fishy/grassy-smelling aldehydes was reduced with increasing exposure time to UV/H2O2. New carbonyl compounds were detected from the UV photolysis of nonadienal and were not removed by further UV irradiation, which was thought to be related to production of new odours. Results indicate that new types of odour were produced from the oxidation of odorous aldehydes, and consequently, sensory tests coupled with chemical analysis should be considered in designing an oxidation process to control recalcitrant odorants.
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Research Article|December 01 2009
Removal and transformation of odorous aldehydes by UV/H2O2
Chang Hyun Jo
Chang Hyun Jo
1Virginia Polytechnic Institute and State University, 418 Durham Hall MSC 0246, Blacksburg VA, 24061, USA2Current address: K water, Water Research Center, 462-1 Jeonmin-dong, Yuseong-gu, Daejeon, Korea
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Andrea M. Dietrich
Andrea M. Dietrich
3Virginia Polytechnic Institute and State University, 413 Durham Hall MSC 0246, Blacksburg VA, 24061, USA
E-mail: andread@vt.edu
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Journal of Water Supply: Research and Technology-Aqua (2009) 58 (8): 580-586.
Article history
Received:
January 13 2009
Accepted:
August 25 2009
Citation
Chang Hyun Jo, Andrea M. Dietrich; Removal and transformation of odorous aldehydes by UV/H2O2. Journal of Water Supply: Research and Technology-Aqua 1 December 2009; 58 (8): 580–586. doi: https://doi.org/10.2166/aqua.2009.121
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