지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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This study has investigated the characteristics of nitrogen mass balance and nitrogen removal ratio as HRT changes at the rate of 8, 12, 16, and 24 hrs in the SBR (Sequencing Batch Reactor) process. This study conducted the operation under the following conditions: SRT (Sludge Retention Time), 17.5 days; 1 cycle operating time, 4, 6, 8, and 12 hrs; COD load, 0.4 kg COD/m3/day; and, nitrogen input rate, 166.5～177.0 mg/cycle. Nitrogen mass clarified at settle mode was 70.0, 56.9, 52.5, and 69.4 mg/cycle, consisting of NOX--N (about 90%), and the nitrogen removal ratio was changed 58.0, 67.3, 70.0, and 58.7% at the above rate of HRT variation respectively. During the above SBR process, nitrogen mass included in wasted sludge was as follows respectively: 21.4, 21.9, 23.8, and 22.6 mgN/cycle. This result means HRT change did not affect nitrogen removal. Nitrogen mass removed through denitrification was 70.5, 95.0, 91.0, and 63.5 mgN/cycle while HRT increased. Nitrogen mass balance calculated through the sum of nitrogen included in clarified water, wasted nitrogen included in sludge, and denitrified nitrogen was 97.2, 98.7, 95.5, and 92.6% compare with input nitrogen mass, showing acceptable value.
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