不同pH条件下短程硝化序批实验和数学模拟

为考察pH值对短程硝化过程动力学的影响,采用SBR工艺,以人工模拟氨氮废水为研究对象,进行了不同pH条件下的硝化批次实验,对氨氮降解过程进行动力学分析。在Monod方程的基础上,分析pH值对氨氧化菌(AOB)和亚硝酸氧化菌(NOB)生长速率的影响,分别建立了AOB和NOB的生长数学模型。利用MATLAB软件,将模型与硝化阶段实测数据进行拟合,取得良好的模拟效果。在此基础上通过模型预测得到泥龄(SRT)为6 d,溶解氧为1.5 mg O2/L,pH值在7.3~8范围内有利于实现短程硝化。

Experimental investigation and mathematical simulation of partial nitrification in batch reactor under different pH

To investigate the effect of pH on partial nitrification kinetics, batch tests with artificially prepared ammonium nitrogen wastewater were conducted in sequencing batch reactor (SBR) under different pH conditions. The effect of pH on the growth rates of ammonium oxidation bacteria (AOB) and nitrite oxidation bacteria (NOB) was analyzed, and the mathematical model for AOB and NOB growth was established based on the Monod equation. Then fitted the model to the measured data by MATLAB software, and the simulation results were good. After that the model was used to predict the startup of partial nitrification, the prediction results show that short-cut nitrification could be achieved on the condition of sludge retention time (SRT) of 6 d,dissolved oxygen (DO) of 1.5 mg/L and pH of 7.3 to 8.