Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Development of Biological Filtration Process for Effective Nitrogen Removal and its Control strategies in Tertiary Treatment of Sewage

생물막 여과반응기를 이용한 고도질소 제거를 위한 운전제어법 개발

  • Jeong, Jin-Woo (Department of Water Supply & Sewerage Policy, Environmental Management Corporation) ;
  • Kim, Sung-Won (Department of Civil & Environmental Engineering, Korea University) ;
  • Tsuno, Hiroshi (Department of Urban and Environmental Engineering, Kyoto University)
  • 정진우 (환경관리공단 상하수도지원처) ;
  • 김성원 (고려대학교 공과대학 토목환경공학과) ;
  • 津野洋 (교토대학교 대학원 공학연구과 도시환경공학과)
  • Received : 2005.09.13
  • Accepted : 2005.11.24
  • Published : 2006.03.30
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Abstract

The operational parameters and control strategies of a tertiary wastewater treatment process a biological filtration system were investigated. The biological filtration system consisted of a nitrification filter (Fiter 1) and a polishing filter with anoxic and aerobic parts (Filter 2). SS, T-C-BOD, and T-N in effluent were kept stable at less than 3, 5 mg/L, and 5 mgN/L, respectively, under a HRT in Filter (filter-bed) of 0.37~2.3 h. T-N at the outlet of Filter 2 were about 1~5 mgN/L under the condition of LV of 50~202 m/d. Methanol addition was controlled based on the COD/N ratio or McCarty's equation. Constant COD/N ratio control results in excess addition under large diurnal fluctuation of $NOx^--N$, and McCarty's equation can be used to add appropriate amount of methanol. Control of methanol addition by on-line nitrate measurement, control of aeration by on-line DO measurement, and control of backwashing by head loss measurement are successfully operated. These results proved that this process prove the easy-maintenance and cost-effectively treatment is attainable.

Keywords

References

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