完全自营养脱氮过程中的影响因素

基于正交实验考察了溶解氧（DO）、初始NH4＋-N浓度、pH对SBR自营养脱氮性能的影响。结果表明，DO和NH4＋-N浓度对好氧氨氧化速率影响大，pH对好氧氨氧化速率的影响小；DO、NH4＋-N浓度对亚硝酸氧化速率的影响较大，pH对亚硝酸氧化速率的影响较小；DO、NH4＋-N浓度和pH对厌氧氨氧化菌（ANAOB）的活性影响较小。好氧氨氧化菌（AOB）直接影响到CANON系统的总氮去除能力，是CANON系统的控制反应，DO是关键控制因子。实验确定的CANON系统优化运行条件为，DO（0．3±0．05）mg／L、初始NH4＋-N浓度150mg／L和pH7．4。

Influencing factors in completely autotrophic nitrogen removal process

Orthogonal test method was used to investigate the effects of DO concentration, initial NH4＋-N concentration and pH on CANON （completely autotrophic nitrogen removal over nitrite） performance of SBR. The results indicated that DO and initial NH4 -N concentrations had significant effects on aerobic ammonium oxi- dation rate while the effect of pH was not significant ; DO and initial NH4 -N concentrations had significant effects on nitrite oxidation rate while the effect of pH was not significant ; DO, initial NH4＋ -N concentrations and pH had little effect on anaerobic ammonium oxidation rate. Aerobic ammonium oxidation, as controlling reaction of CAN- ON process, directly determined the system＇ s total nitrogen removal capacity, and DO concentration was the key factor. The optimal operating conditions of the CANON process were determined as follows ： the optimal DO con- centration of （0.3 ±0.05）mg/L, the optimal initial NH4＋ -N concentration of 150 mg/L and the optimal pH of 7.4.