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Effects of Nitrate Ions on Advanced Oxidation of UV/H2O2 for 2,4-Dichlomphenol Degradation  

Park, Jae Han (School of Civil and Environmental Engineering, Yonsei University)
Lee, Ji Yong (School of Civil and Environmental Engineering, Yonsei University)
Ahn, Yoon Hee (School of Civil and Environmental Engineering, Yonsei University)
Moon, Tae Hoon (School of Civil and Environmental Engineering, Yonsei University)
Yim, Sung Kyun (Construction&Environmental Research Team, Kolon E&C Co)
Ko, Kwang Baik (School of Civil and Environmental Engineering, Yonsei University)
Publication Information
Journal of Korean Society on Water Environment / v.23, no.3, 2007 , pp. 319-323 More about this Journal
Abstract
The Advanced Oxidation Process (AOP) is being increasingly used to oxidize complex organic constituents in treated effluents from domestic wastewater treatment plants. Generally, ${NO_3}^--N$ concentrations ranges between 5 and 8 mg/L for biologically well-treated effluents. However, nitrate ions, ${NO_3}^-$, affects on oxidation as not only a well-known strong absorber of UV light below 250 nm of wavelength but also as an OH radical scavenger. The objective of this study was to evaluate the AOP systems for degradation of 2,4-DCP, and to delineate the effect of nitrate ions on UV oxidation of 2,4-DCP by conducting a bench-scale operation at various reaction times and initial concentrations of $H_2O_2$. The experimental results indicated that 2,4-DCP could be completely oxidized by $UV/H_2O_2$ process with an initial $H_2O_2$ concentration of 20 mg/L at a retention time of 1.0 min or longer. Nitrate ions did not show any adverse effect on 2,4-DCP oxidation at this high $H_2O_2$ concentration, and the practical initial $H_2O_2$ concentration and reaction time for the 80% oxidation turned out to be 5 mg/L and 1.0 min, respectively.
Keywords
AOP; $H_2O_2$; Nitrate ion; UV; 2,4-DCP;
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