کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6584597 456358 2015 32 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of ozonation on the toxicity and biodegradability of 2,4-dichlorophenol-containing wastewater
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
The effect of ozonation on the toxicity and biodegradability of 2,4-dichlorophenol-containing wastewater
چکیده انگلیسی
Ozone pre-treatment results in a decrease in 2,4-DCP and an increase in chloride concentration. The release of chloride is inversely proportional to the degradation of 2,4-DCP, implying the dechlorination of the aromatic ring as a first reaction step in its decomposition. Furthermore, the degradation of 2,4-DCP is described by pseudo first-order kinetics. The degradation rate decreases when biodegradable organic matter is present in the wastewater and the extent of this decrease depends on the nature of the biodegradable organic matter. The measured COD degradation does not correspond with the mineralization of 2,4-DCP. Hence, the pollutant is instead degraded into dehalogenated intermediates. Further, respirometric measurements are performed in order to investigate the effects on the toxicity of the wastewater. The period before biomass activity is observed, the so-called lag phase, is significantly reduced and, furthermore, the maximal Specific Oxygen Uptake Rate (SOUR), indicating biomass activity, increases with increasing ozone reaction time. This means that the observed toxic effects are reduced. Also, the biodegradable fraction increases and the amount of refractory COD decreases by the ozone treatment because of the (partial) degradation of the pollutant. Therefore, the biodegradation can be performed in a shorter period of time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 280, 15 November 2015, Pages 728-736
نویسندگان
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