温度对海洋厌氧氨氧化菌脱氮效能的影响

Effect of Temperature on Nitrogen Removal Performance of Marine Anaerobic Ammonium Oxidizing Bacteria

采用ASBR反应器,研究了不同温度对海洋厌氧氨氧化菌处理含海水污水脱氮效能的影响,并利用修正的Logistic模型模拟不同温度下海洋厌氧氨氧化菌的动力学特性.结果表明,在25~35℃之间,温度对反应器的脱氮效能影响不大,总氮去除率(TNRE)基本保持在(82±2)%,总氮容积负荷去除速率(TNRR)稳定在(0.62±0.01)kg·(m^3·d)^(-1);在20℃时,TNRE从起始的59%经过13d上升到79%,说明在此温度下,海洋厌氧氨氧化菌仍然具有较强的脱氮能力,反应器在较低温处理含海水污水具有较好的发挥潜能;然而当温度降到15℃和10℃时,反应器的脱氮效能受到明显的抑制,TNRE分别下降至(40±8)%和(11±4)%,TNRR也下降至(0.30±0.04)kg·(m^3·d)^(-1)和(0.08±0.03)kg·(m^3·d)^(-1).根据Arrhenius方程得到,在25~35℃时,海洋厌氧氨氧化反应的活化能为26 k J·mol^(-1),在10~25℃时,海洋厌氧氨氧化反应的活化能为76 k J·mol^(-1).此外,通过Logistic模型对海洋厌氧氨氧化脱氮进行动力学分析,得到不同温度下NRE和出水总氮浓度(ceff)的预测公式,相关系数R2在0.966 8~0.995 7之间.

The effect of temperature on the nitrogen removal performance of marine anaerobic ammonium oxidizing bacteria processing sewage seawater was studied by employing an ASBR reactor, and the dynamic characteristics of the marine anaerobic ammonium oxidizing bacteria at different temperatures were simulated by modified Logistic model. The experimental results indicated that the nitrogen removal performance was affected little at 25-35℃. The total nitrogen removal efficiency （TNRE） remained at （82±2）% and the total nitrogen removal rate （TNRR） was stabilized at （0.62±0.01） kg·（m^3·d）^-1. When the temperature was 20℃, TNRE increased from 59% at the beginning to 79% after 13 days. This indicated that the marine anammox bacteria still had strong ability of nitrogen removal, and the reactor in the low temperature treatment of sewage containing seawater had a good potential. However, when the temperature dropped to 10-15℃, the nitrogen removal performance of the reactor was inhibited. TNRE decreased to （40±8）% and （11±4）%, respectively. Besides, TNRR also decreased to （0.30±0.04） kg·（m^3·d）^-1 and （0.08±0.03） kg·（m^3·d）^-1, respectively. According to the Arrhenius equation, the activation energy for marine anaerobic ammonium oxidation reaction was 26 kJ·mol-1 at 25-35℃, and the activation energy of marine anaerobic ammonium oxidation reaction was 76 kJ·mol-1 at 10-25℃. In addition, dynamic analysis was performed by Logistic model and the NRE and effluent total nitrogen concentration （ceff） at different temperatures were forecasted. The correlation coefficient R2 was between 0.9668 and 0.9957.