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Development of BNR(Biological Nutrient Removal) Process Using Expanded Polystylene(EPS) Media  

Ryu, Hong-Duck (Department of Environmental Engineering, Chungbuk National University)
Min, Kyung-Kook (Department of Water Supply and Sewage Management, Environmental Management Corp.)
Lee, Jeong-Hun (Nature & Environmental Co., Ltd.)
Choi, Kyoung-Young (Nature & Environmental Co., Ltd.)
Lim, Heun-Eun (Department of Environmental Engineering, Chungbuk National University)
Kim, Chul-Hwan (Department of Environmental Engineering, Chungbuk National University)
Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.1, 2006 , pp. 1-6 More about this Journal
Abstract
Biological nutrient removal(BNR) process used in this study, which was packed with EPS(expanded polystylene) media, has more many advantages in aspect of reducing hydraulic retention time(HRT) of the process and having less effect of temperature in the winter season than commercial process in the present. Bench-scale study was performed using domestic wastewater. In the results, it was observed that the T-N removal efficiencies in HRT 6 hr and HRT 4 hr were 55% and 51%, respectively, showing the small reduction (about 4%) of T-N removal efficiency according to shortening of HRT. In comparison of T-N removal characteristic in summer and winter seasons, it showed that T-N removal efficiencies in summer and winter seasons were 65% and 54%, respectively, showing the 11% lower T-N removal efficiency in winter season than in summer season due to deterioration of nitrification in winter season. In the studies of influent loading rate and C/N ratio, the process showed stable effluent quality under the condition of broad influent loading rate and C/N ratio. Therefore, it is anticipated that the developed process in this study could be applicable to small wastewater treatment plant in nutrient removal.
Keywords
EPS; HRT; Temperature; Domestic Wastewater; Bench-scale; Loading Rate; C/N Ratio;
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