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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 1997.8
- 수록면
- 335 - 346 (12page)
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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 different C : N ratios (3, 4, 5, 6) were tested.
The removal efficiencies of NO₃￣-N and total inorganic nitrogen (TIN) 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 5.0 respectively while that by glucose (86.3%) was achieved when 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 inorganic nitrogen (TIN) were gained at C : N ratio of 5.0. The maximum removal 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 ratio 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.
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 different C : N ratios (3, 4, 5, 6) were tested.
The removal efficiencies of NO₃￣-N and total inorganic nitrogen (TIN) 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 5.0 respectively while that by glucose (86.3%) was achieved when 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 inorganic nitrogen (TIN) were gained at C : N ratio of 5.0. The maximum removal 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 ratio 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.
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