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기질 공급 방식에 의한 연속 회분 활성슬러지법의 특성에 관한 연구
The Effect of Substrate Feeding Variation on the SBR Process
HWAHAK KONGHAK, April 1993, 31(2), 137-143(7), NONE
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Abstract
실제의 도시하수와 유사한 조성비의 인공하수를 사용하여 기질 공급 방식을 달리하면서 간헐적 폭기에 의한 연속 회분 활성슬러지법을 실험실 규모로 운전하였다. 1 cycle을 24시간으로 하여 겉보기 수율, 질소 및 인의 제거 능력을 비교 검토하였다. SRT 13일, COD 용적부하 0.38kg/m3/day로 한 모든 실험조건에서 COD 제거 효율은 97%이상으로 매우 양호하였다. 기질 공급이 종료되는 시간을 12시간, 7시간, 3시간 및 1분 이내로 하였을 때 각각에 대한 겉보기 수율은 증가하였다. 질소 제거 효율은 74-83%로 표준 활성슬러지법에서 기대되는 것보다 월등히 높았으며, 가능한 한 폭기가 정지된 상태에서 기질을 몇회에 나누어 분주시키는 것이 질소 제거에는 효과적이었다. 인 제거 효율은 폭기가 정지된 상태에서 기질 공급이 종료되는 시간을 가능한 한 짧게 하여 운전하는 것이 인제거에 효과적이었다.
A laboratory scale sequencing batch reactor with a total cycle period of 24 hours was operated to investigate its performance to artificial sewage whose composition was similiar to that of actual municipal sewage. More than 97% of inlet COD was removed at a SRT of 13 days and organic loading rate of 0.38kg COD/m3/day. The observed yield was shown in the range of 0.75 to 0.44 with the change of the substrate feeding interval of 1 minute through 12 hours. With these experimental condtions, the removal efficiency of nitrogen was ranged from 74 to 83%, which was much higher than that of the ordinary activated sludge process. It was found that the nitrogen removal was well increased with intermittent substrate feeding under no aeration and the observed yield and the removal efficiency of phosphorous were also increased according to the decrease of the substrate feeding interval.
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