Faculty of Engineering, Department of Civil Engineering, University of Malaya, Kuala Lumpur, Malaysia.
Bioresour Technol. 2010 Apr;101(7):2236-42. doi: 10.1016/j.biortech.2009.11.068. Epub 2009 Dec 16.
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 11 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 0.5h.
本研究在最佳溶液 pH 值和碳酸氢盐浓度条件下研究了自养氢营养反硝化动力学。首先使用实验设计 (DOE) 方法获得了最佳 pH 值和碳酸氢盐浓度。为此进行了总共 11 次实验。在优化运行中使用了 20-2000mg/L 的碳酸氢钠浓度和 6.5 至 8.5 的 pH 值范围。结果发现，与碳酸氢盐剂量相比，pH 值对反硝化过程的影响更为显著。所开发的二次模型预测了在 pH 值为 8 和 1100mg NaHCO3/L 的最佳条件。使用这些最佳条件，在单独的实验中研究了硝酸盐和亚硝酸盐降解的反硝化动力学。发现这两个过程均遵循零级动力学模型。当每 0.5h 供应一次氢气时，硝酸盐和亚硝酸盐修复的最终比降解速率分别为 29.60mg NO3--N/g MLVSS/L 和 34.85mg NO3--N/g MLVSS/L。
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