Journal
WATER RESEARCH
Volume 45, Issue 4, Pages 1890-1896Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2010.12.008
Keywords
Advanced oxidation; Chlorine photolysis; Hydroxyl radicals; Methanol; p-Chlorobenzoic acid; Cyclohexanoic acid
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Several organic compounds were used as radical scavengers/reagents to investigate the possibility of the UV/chlorine process being used as an advanced oxidation process (AOP) in the treatment of drinking water and wastewater. The UV/H2O2 process was selected as a reference, so that the results from the UV/chlorine process could be compared with those of the UV/H2O2 process. Methanol was added to active chlorine solutions at both pH 5 and 10 and into hydrogen peroxide samples. The photodegradation quantum yields and the (OH)-O-center dot radical production yield factors, which are significant in evaluating AOPs, were calculated for both the UV/chlorine and the UV/H2O2 processes. The yield factor for the UV/chlorine process at pH 5 was 0.46 +/- 0.09, which is much lower than that of the UV/H2O2 process, which reached 0.85 +/- 0.04. In addition to methanol, para-chlorobenzoic acid (pCBA) and cyclohexanoic acid (CHA) were added to active chlorine solutions and to H2O2 solutions, to evaluate the efficiencies of oxidizing these organic compounds. The specific first-order reaction rate constants for the oxidation of pCBA and CHA, using the UV/chlorine process, were lower than those found using the UV/H2O2 process. (C) 2010 Elsevier Ltd. All rights reserved.
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