Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Development of BNR(Biological Nutrient Removal) Process Using Expanded Polystylene(EPS) Media

Expanded Polystylene(EPS) 여재를 이용한 BNR(Biological Nutrient Removal) 공정 개발

  • 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)
  • 류홍덕 (충북대학교 공과대학 환경공학과) ;
  • 민경국 (환경관리공단 상하수도지원처) ;
  • 이정훈 ((주) 자연과 환경) ;
  • 최경영 ((주) 자연과 환경) ;
  • 임헌은 (충북대학교 공과대학 환경공학과) ;
  • 김철환 (충북대학교 공과대학 환경공학과) ;
  • 이상일 (충북대학교 공과대학 환경공학과)
  • Published : 2006.01.31
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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.

본 연구에서 수행한 입상형의 발포 폴리스티렌을 이용한 고도처리 공정은 기존의 상용화되거나 개발중인 영양염류 처리공정에 비해 수리학적 체류시간을 상당히 줄일 수 있고 동절기에도 온도의 영향을 크게 받지 않는 장점을 가지고 있다. 도시하수를 이용하여 bench-scale 연구를 수행한 결과 T-N 제거효율의 경우 HRT 6 hr 및 4 hr에서 각각 약 55% 및 51%로서 HRT가 짧아졌을때 단지 약 4%의 처리효율 감소가 관찰되었다. 온도 영향에 있어서 여름철과 겨울철의 T-N 제거효율을 비교해본 결과 T-N 제거 효율이 각각 약 65% 및 54%로 관찰되어 여름철이 겨울철에 비해 약 11% 더 높은 효율이 관찰되었으며 겨울철 효율저하는 주로 암모니아성 질소의 질산화가 원활이 이루어지지 않았기 때문인 것으로 관찰되었다. 유입부하 및 C/N 비에 관한 연구에서는 유량 및 농도의 변화가 심한 하 폐수 처리에 있어서도 안정된 처리수질을 확보할 수 있었으며, C/N 비가 감소에 따른 처리효율 저하가 크지 않음을 관찰 할 수 있었다. 따라서 본 개발 시스템을 기존의 중 소규모 하수처리장에 적용할 경우 유입수내의 유기물을 최대한 활용하여 영양염류를 처리할 수 있을 것이라 기대된다.

Keywords

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