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논문 상세정보

침지식 여과조를 이용한 합성 폐수의 탈질화

Denitrification of Synthetic Wastewater in Submerged Biofilter

초록

연구는 순환 여과식 어류 양식 시설에 일반적으로 이용되고 있는 선라이트 골판을 여과재료로 한 침지식 여과조의 적정 탈질 조건을 구명하기 위해 외부 탄소원으로 메탄올과 글루코스를 사용하여 수리학적 체류 시간 (hydraulic retention time, HRT)과 COD에 대한 NO 하(3) 상(-)-N 비율 변화에 따른 적정 탈질 조건을 알아보았다. 질산성 질소와 총무기질소(TIN)의 제거 효율은 HRT 4 시간보다는 8 시간이 좋았으며, 글루코스보다는 메탄올을 이용한 것이 좋았다(P<0.05). 최대 질산성 질소 제거는 글루코스의 경우 HRT 8 시간과 C : N 비율 4일 때 86.3%였고, 메탄올은 HRT 8시간과 C : N 비율 5일 때 97.8%, 6일 때 92.2%를 보여 C : N 비율 5가 가장 최적인 것으로 나타났다. 최대 총무기질소 제거 효율은 HRT 8 시간일 때 C : N 비율 5에서 글루코스는 71.5%, 메탄올은 96.9%을 보였다. 탈질화에 필수적인 혐기적 조건은 HRT 8 시간과 C : N 비율 5 이상이 되었을 때 이루어진 것으로 보아 적정 C : N 비율과 혐기적 조건이 이루어졌을 때의 최적의 탈질 효율을 보이는 것으로 나타났다.

Abstract

Denitrification is one of the important processes of removing nitrate from in recirculating aquaculture systems. And this process is affected by many factors such as external organic carbon sources, hydraulic retention time (HRT), COD/NO3--N (C:N) ratio, etc. However, not many studies were done for the optimum conditions of denitrification in the recirculation system for aquaculture. Therefore, this study was conducted to find out the optimum removal condition of NO3--N using submerged denitrification biofilter. The combinations of two external organic carbon sources (glucose and methanol), two HRT (4 and 8-hour) and four differnent C : N ratios (3, 4, 5, 6) were tested. The removal efficiencies of NO3--N and total inorganic nitrogen (TIM) at 8-hour HRT were better than those at 4-hour's (P<0.05). The maximum removal efficiency of NO3--N by methanol (97.8%) was achieved at HRT and C : N ratio were 8-hour and 4.0 respectively. The efficiencies of methanol for the removal of NO3--N and TIN were always better than those of glucose (P<0.05). The maximum removal efficiencies of total inorgainc nitrogen (TIN) were gained at C : N ration of 5.0. The maximum removel efficiencies of TIN using methanol and glucose were 96.9% and 71.5% respectively. Anaerobic condition which is necessary for denitrification process was not made until the 8-hour HRT and higher C : N ratio (5.0). Removal of NO3--N at 4-hour HRT and C : N ration lower than 5.0 were inhibited by oxygen and/or low quantity of external organic carbon. Removal efficiencies of NO3--N were also inhibited by high C : N (6.0) ratio when HRT was 8-hour.

저자의 다른 논문

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이 논문을 인용한 문헌 (3)

  1. 1999. "Optimum Conditions for the Removal of External Organic Carbon Sources in a Submerged Denitrification Biofilter" 韓國養殖學會誌 = Journal of aquaculture, 12(1): 47~56 
  2. 2003. "Recycling Water Treatment of Aquaculture by Using DynaSand Filter II. Effect of Coating on Removal of Bacteria and Virus in Sand Columns" 韓國養殖學會誌 = Journal of aquaculture, 16(2): 76~83 
  3. 2003. "" Ocean and polar research, 25(4): 493~501 

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