不同有机物作为电子供体提高反硝化速率的比较

分别用葡萄糖、甲醇和邻苯二甲酸氢钾3种有机物作为电子供体，进行反硝化实验．分别在C／N比为4和10的条件下，比较它们对反硝化速率的影响．研究结果表明：在C/N比为4时，初始浓度为60mg／L的反硝化速率在葡萄糖为碳源时为最大，其次是甲醇，而邻苯二甲酸氢钾速率最慢．而当C／N比为10时，所有有机物作为电子供体时反硝化速率则基本相同．随着浓度的升高，同样在CJN比为4或者10时，以葡萄糖和甲醇作为电子供体时，反硝化速率随着初始NO3^--N浓度的增加而增加，表现为Monod模型．而以邻苯二甲酸氢钾为碳源时，反硝化速率则首先随着初始NO3^--N浓度增加而增加，随后则逐步下降，表现为Aiba抑制型．在所有情况下，以葡萄糖为电子供体时，最大的NO3^--N去除速率均为最大，且饱和常数悠最小．

Comparison of different organic compounds as electron donors for enhancingdenitrification

Glucose, methanol and potassium biphthalate were respectively used as electrons for denitrification, which was carried out at C/N ratio of 4 and 10 ,to compare their impact on nitrate removal rate. Experimental results demonstrated that glucose was superior to methanol and potassium biphthalate for accelerating nitrate removal at C/N ratio of 4 and initial nitrate nitrogen of 60 mg/L,in which methanol was superior to potassium hiphthalate. But when C/N ratio was 10, these organic compounds gave similar effect. For nitrate removal kinetics, nitrate removal rate increased with increasing of initial nitrate nitrogen concentration corresponding to glucose and potassium biphthalate as electron donors at both C/N of 4 and 10, which could be described with Monod model. While potassium biphthalate as electron, nitrate nitrogen removal increased with increasing of initial nitrate nitrogen concentration at first, and then decreased, which showed Aiba inhibition model. For all situations, glucose gave the maximum ni- trate-removal rate （ rmax ） and minimum half-maximum-rate concentration （ Ks ）.