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Environmental Engineering Research 2006;11(6): 293-302. DOI: https://doi.org/10.4491/eer.2006.11.6.293
FORMATION OF KETOACIDS AND AOC DURING OZONATION IN DRINKING WATER
Kyung-Hyuk Lee
Water Research Center, Korea Institute of Water and Environment, 462-1 Jeonmin-Dong, Yusung-Gu, Daejon, Korea 305-730
Corresponding Author: Kyung-Hyuk Lee ,Tel: +82-42-860-0373, Fax: +82-42-860-0399 , Email: kh.lee@kowaco.or.kr
Received: March 9, 2006;  Accepted: July 10, 2006.
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ABSTRACT
The reaction of ozone with NOM (Natural Organic Matter) can occur by two different pathways: that involving molecular ozone and by way of reactions with hydroxyl radicals which are produced from the decomposition of molecular ozone. As such, the formation of ketoacids and Assimilable Organic Carbon (AOC) can be controlled by controlling the pathway by which ozone reacts with NOM. The ratios of [OH-]/[03] (RCT values) were determined under the various ozonation conditions. The RCT values increased with increasing initial ozone concentration. The RCT values (ranges from 10 to 35°C) increased linearly as temperature increased (within the range from 10 to 35°C). However, RCT was independent of hydraulic retention time (HRT). Operational conditions were found to affect the formation of AOC. The conditions where the molecular ozone reaction predominated resulted in an increase in the formation of AOC.
Keywords: Ozonation | Ketoacids | AOC (Assimilable Organic Carbon) | Molecular Ozone | Hydroxyl Radical
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