期刊
JOURNAL OF ENVIRONMENTAL ENGINEERING
卷 137, 期 7, 页码 639-649出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)EE.1943-7870.0000361
关键词
Wastewater; Para-chlorophenol; UV irradiation; Toxicity; Statistical analysis
资金
- Ministry of Science, Education, and Sport of the Republic of Croatia [125-1253092-1981]
- National Foundation for Science, Higher Education, and Technological Development of the Republic of Croatia [04/14]
The aim of the study was to evaluate the toxicity and biodegradability of para-chlorophenol (p-CP) model wastewater when treated by UV and UV/H2O2 processes. We investigated the correlations between the toxicity and the concentration of p-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 BOD5 (chemical and biochemical oxygen demand). Biodegradability is estimated by the BOD5/COD ratio. The toxic effects were investigated on luminescent bacteria Vibrio fischeri, determining the EC50 value. The correlation between each data pair was estimated using a statistical approach calculating the Spearman rank coefficients. The biodegradability of the p-CP model wastewater was improved by the UV/H2O2 process; the BOD5/COD ratio increased from 0.37 to 0.73 after a 1-h treatment (F=1243 mJ cm(-2)). 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 p-CP degradation, as well as for the BOD5/COD ratio. DOI: 10.1061/(ASCE)EE.1943-7870.0000361. (C) 2011 American Society of Civil Engineers.
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