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자료유형
학술저널
저자정보
Byeong-Hak Yoo (Korea Atomic Energy Research Institute) 이상훈 (계명대학교)
저널정보
한국자원공학회 Geosystem Engineering Geosystem Engineering Vol.21 No.5
발행연도
2018.1
수록면
243 - 250 (8page)

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This study investigated nitrite (NO2−) accumulation due to FA (Free Ammonia: NH3) inhibition in an anaerobic-aerobic-anoxic (AOA) process reactor to mainly treat wastewater containing 302−610 mg/L of NH3/NH4+–N. Based on an experimental operation focusing on the nitrification, it was observed that NO2− was accumulated in the aerobic nitrification zone as pH increased, due to inhibition of NO2− conversion to NO3− by FA. This result implied FA inhibition to NOB (NO2−−Oxidizing Bacteria) for converting NO2− to NO3−. The objective of this study is to develop a feasible monitoring procedure for early detection of the FA inhibition toward NO2− accumulation and poor nitrification. Thus, in order to rapidly assess FA concentrations, an NH3 probe was utilized to measure NH3 concentrations together with applying a simple model prediction using the measured NH4+ concentrations, the Henry’s law constant of NH3 and measured pH. The predictive model NH3 levels were verified by a good correlation (89%) with the corresponding measured data, but the model prediction underestimated FA concentrations at less than 7.4 and a little overestimated at pH above 7.5. Interestingly, accumulated NO2− levels were roughly correlated with FA levels that were observed at delayed time points. This reflects the detected FA levels can be good indicators of NO2− levels with some delayed time. NO2− accumulation started at measured FA concentrations of higher than approximately 3 mg/L and ceased below that FA level.

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