Treatment of Chlorophenols by UV-Based Processes: Correlation of Oxidation By-Products, Wastewater Parameters, and Toxicity
Publication: Journal of Environmental Engineering
Volume 137, Issue 7
Abstract
The aim of the study was to evaluate the toxicity and biodegradability of para-chlorophenol (-CP) model wastewater when treated by UV and processes. We investigated the correlations between the toxicity and the concentration of -CP and its oxidation by-products, as well as other parameters—summarizing characteristics which potentially indicate hazardous water components, e.g., AOX (adsorbable organic halides), TOC (total organic carbon), and COD and (chemical and biochemical oxygen demand). Biodegradability is estimated by the ratio. The toxic effects were investigated on luminescent bacteria Vibrio fischeri, determining the value. The correlation between each data pair was estimated using a statistical approach calculating the Spearman rank coefficients. The biodegradability of the -CP model wastewater was improved by the process; the ratio increased from 0.37 to 0.73 after a 1-h treatment (). According to the calculated Spearman rank coefficient, the highest correlation with toxicity data among all monitored parameters was obtained for hydroquinone and benzoquinone, as by-products of -CP degradation, as well as for the ratio.
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Acknowledgments
We would like to acknowledge the financial support both from the Ministry of Science, Education, and Sport of the Republic of Croatia (Project #UNSPECIFIED125-1253092-1981) and the National Foundation for Science, Higher Education, and Technological Development of the Republic of Croatia (Project #UNSPECIFIED04/14: Wastewater Treatment in DINA-Petrokemija Omisalj as a Contribution to Ecosystem Preservation).
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© 2011 American Society of Civil Engineers.
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Received: Dec 23, 2009
Accepted: Jan 14, 2011
Published online: Jan 18, 2011
Published in print: Jul 1, 2011
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