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Temperature-Dependent Effects of Pollutants on Biological Denitrification Process for Treating Cokes Wastewater  

Kim, Young Mo (School of Environmental Science and Engineering, Department of Chemical Engineering, Advanced Environmental Biotechnology, Research Center, POSTECH)
Park, Donghee (School of Environmental Science and Engineering, Department of Chemical Engineering, Advanced Environmental Biotechnology, Research Center, POSTECH)
Ahn, Chi Kyu (School of Environmental Science and Engineering, Department of Chemical Engineering, Advanced Environmental Biotechnology, Research Center, POSTECH)
Lee, Min Woo (School of Environmental Science and Engineering, Department of Chemical Engineering, Advanced Environmental Biotechnology, Research Center, POSTECH)
Park, Jong Moon (School of Environmental Science and Engineering, Department of Chemical Engineering, Advanced Environmental Biotechnology, Research Center, POSTECH)
Publication Information
Korean Chemical Engineering Research / v.46, no.6, 2008 , pp. 1124-1129 More about this Journal
Abstract
Cokes wastewater is one of the most toxic industrial effluents since it contains high concentrations of pollutants, such as phenol, ammonia, thiocyanate and cyanides. Although biological pre-denitrification process has been used to treat this wastewater in Korea, unexpected failure in nitrogen removal occasionally occurs during summer season. In this study, therefore, we examined inhibitory effects of phenol, ammonia, thiocyanate, ferric cyanide and free cyanide on biological denitrification according to temperature variation ($20{\sim}38^{\circ}C$). Batch experiments showed that denitrification rate was faster in summer ($38^{\circ}C$) than other seasons, and removal rates of pollutants increased with increasing temperature. Phenol, ammonia, thiocyanate and ferric cyanide did not inhibit denitrification even at its high concentration (200 mg/L). However free cyanide above 0.5 mg/L seriously inhibited the bilolgical denitrification reaction. Inhibitory effect of these pollutants was reduced with increasing temperature.
Keywords
Cokes Wastewater; Denitrification; Pre-denitrification Process; Phenol; Thiocyanate; Cyanides;
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Times Cited By KSCI : 1  (Citation Analysis)
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