期刊
BIORESOURCE TECHNOLOGY
卷 101, 期 7, 页码 2236-2242出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.11.068
关键词
Denitrification; Optimization; Kinetics; pH; Bicarbonate
资金
- Kuok Foundation
In this study the kinetics of autohydrogenotrophic denitrification was studied under optimum solution pH and bicarbonate concentration. The optimal pH and bicarbonate concentration were firstly obtained using a design of experiment (DOE) methodology. For this purpose a total of I I experiments were carried out. Sodium bicarbonate concentrations ranging of 20-2000 mg/L and pH values from 6.5 to 8.5 were used in the optimization runs. It was found that the pH has a more pronounced effect on the denitrification process as compared to the bicarbonate dose. The developed quadratic model predicted the optimum conditions at pH 8 and 1100 mg NaHCO3/L. Using these optimal conditions, the kinetics of denitrification for nitrate and nitrite degradation were investigated in separate experiments. Both processes were found to follow a zero order kinetic model. The ultimate specific degradation rates for nitrate and nitrite remediation were 29.60 mg NO3--N/g MLVSS/L and 34.85 mg NO3--N/g MLVSS/L respectively, when hydrogen was supplied every 0.5 h. (C) 2009 Elsevier Ltd. All rights reserved.
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