Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.watres.2012.01.025
Title: Incorporation of initiation, promotion and inhibition in the R ct concept and its application in determining the initiation and inhibition capacities of natural water in ozonation
Authors: Yong, E.L.
Lin, Y.-P. 
Keywords: Hydroxyl radical
Inhibitor
Initiator
Ozonation
Promoter
R ct concept
Issue Date: 15-Apr-2012
Source: Yong, E.L., Lin, Y.-P. (2012-04-15). Incorporation of initiation, promotion and inhibition in the R ct concept and its application in determining the initiation and inhibition capacities of natural water in ozonation. Water Research 46 (6) : 1990-1998. ScholarBank@NUS Repository. https://doi.org/10.1016/j.watres.2012.01.025
Abstract: Ozonation is widely employed in water treatment to purify water. The R ct concept, which is defined as the ratio of OH exposure to ozone exposure, has been commonly used to quantify the OH concentration generating from ozone decomposition and model the removal of organic pollutant. Due to its empirical nature, however, the R ct concept is limited in quantitatively elucidating how initiator, promoter and inhibitor involved in the OH chain reactions affect its value. A new R ct model was developed by integrating the R ct concept and the transient steady-state OH concentration to evaluate the influences of these modes of reactions on the R ct value. It was found that the R ct value is not only the ratio of OH exposure to ozone exposure but also the ratio of the total initiation capacity to the total inhibition capacity in a system. The presence of promoter, however, does not affect the R ct value although it does accelerate ozone decomposition leading to lower ozone and OH exposures and result in hindered removal of target pollutant. The hindered removal of ibuprofen by ozonation in the presence of methanol (promoter) can be quantitatively described by the new R ct model. The model can also be used to quantify the initiation and inhibition capacities of an ozonation system via the addition of an external inhibitor. Its application in determining the initiation and inhibition capacities of natural water was demonstrated. © 2012 Elsevier Ltd.
Source Title: Water Research
URI: http://scholarbank.nus.edu.sg/handle/10635/91019
ISSN: 00431354
DOI: 10.1016/j.watres.2012.01.025
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