A kinetic study of autohydrogenotrophic denitrification at the optimum pH and sodium bicarbonate dose

作者：Ghafari Shahin; Hasan Masitah; Aroua Mohamed Kheireddine^*

来源：Bioresource Technology, 2010, 101(7): 2236-2242.

DOI：10.1016/j.biortech.2009.11.068

• Denitrification
• Optimization
• Kinetics
• pH
• Bicarbonate

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 NaHCO(3)/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 NO(3)(-)-N/g MLVSS/L and 34.85 mg NO(3)(-)-N/g MLVSS/L respectively, when hydrogen was supplied every 0.5 h.

• 出版日期2010-4