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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 박정환
- 발행연도
- 2019
- 저작권
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Most denitrification studies have tested carbon based heterotrophic denitrification in freshwater conditions, which result in excessive bacterial biomass over the denitrification process. This study evaluated the performance of sulfur based autotrophic denitrification with different sulfur/nitrogen (S/N) ratios and initial pHs in the seawater condition.
Experimental S/N ratios in the first experiment were 0.2, 0.7, 1.2, 1.7, 2.2 and 2.7 in the mole basis. Daily removal rates of nitrate-N ranged 248~257 g/m3·day-1 at S/N ratios of over 1.7, showing no differences among the treatments. In addition, the produced sulfate (the end-product of sulfur) per removed nitrate-N increased with increasing S/N ratio, indicating that more electron donors were used to remove the same amount of nitrate-N. Also, concentrations of total ammonia nitrogen and nitrite-nitrogen were not significantly different among the treatments over S/N ratio of 1.7 (P>0.05).
Experimental initial pHs used in the second experiment were set at 5, 6, 7, 8 and 9. The removal rate of nitrate-N was highest (235 g/m3·day-1) at the initial pH of 8, decreasing at the higher or lower initial pHs.
In conclusion, the optimum S/N ratio and initial pH or autotrophic denitrification using thiosulfate as an electron donor were found at 1.7 and 8, respectively.
Experimental S/N ratios in the first experiment were 0.2, 0.7, 1.2, 1.7, 2.2 and 2.7 in the mole basis. Daily removal rates of nitrate-N ranged 248~257 g/m3·day-1 at S/N ratios of over 1.7, showing no differences among the treatments. In addition, the produced sulfate (the end-product of sulfur) per removed nitrate-N increased with increasing S/N ratio, indicating that more electron donors were used to remove the same amount of nitrate-N. Also, concentrations of total ammonia nitrogen and nitrite-nitrogen were not significantly different among the treatments over S/N ratio of 1.7 (P>0.05).
Experimental initial pHs used in the second experiment were set at 5, 6, 7, 8 and 9. The removal rate of nitrate-N was highest (235 g/m3·day-1) at the initial pH of 8, decreasing at the higher or lower initial pHs.
In conclusion, the optimum S/N ratio and initial pH or autotrophic denitrification using thiosulfate as an electron donor were found at 1.7 and 8, respectively.
목차
목 차I. 서 론 1II. 재료 및 방법 5II-1. 미생물 배양 5II-2. Batch 시스템 6II-3. 실험 방법 9II-3-가. S/N비가 탈질과정에 미치는 영향 9II-3-나. 초기 pH가 탈질과정에 미치는 영향 9II-4. 탈질 효율 평가 방법 11II-5. 수질 분석 12II-6. 통계 처리 12III. 결 과 15III-1. S/N비가 NO3?-N 제거에 미치는 영향 15III-2. 초기 pH가 NO3?-N 제거에 미치는 영향 24IV. 고 찰 32IV-1. S/N비가 NO3?-N 제거에 미치는 영향 32IV-2. 초기 pH가 NO3?-N 제거에 미치는 영향 34감사의 글 37참 고 문 헌 39
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