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Removal of Nitrogen and Phosphorus from Municipal Wastewater by a Pilot-scale BNR Process  

Kim, Young-Chur (경성대학교 공과대학 건설.환경공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.21, no.5, 2007 , pp. 589-599 More about this Journal
Abstract
This study was conducted to investigated the removal efficiency of BOD and nutrient for the treatment of low strength municipal wastewater by a biological nutrient removal system. In this experiment, the effect of operating parameter including HRT of 7.0hr, BOD/TN ratios of 2.62~4.08, internal recycle of 50~300%, and return sludge of 50~100%, were studied during winter season. Efficiencies of organic matter and T-P removal and denitrification were not significantly affected by the change of temperature in winter season. However, the specific nitrification rate and nitrification efficiency decreased at low temperature. Besides, denitrification efficiencies increased with increasing BOD/TN ratios. It was also found that the internal recycle and return sludge ratio below 50% is required for the effective denitrification of low strength municipal wastewater. With operating mode 4 of the optimum, the effluent BOD, T-N and T-P concentration were obtained to average 5.8, 14.6, and 0.84 mg/L, respectively. The temperature-activity coefficient (${\theta}$) of specific nitrification rate, specific denitrification rate and specific phosphorus uptake rate were obtained 1.044, 1.017, 1.028, respectively.
Keywords
BNR; Internal recycle; BOD/TN ratios; T-N; T-P;
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Times Cited By KSCI : 1  (Citation Analysis)
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