脱除废水中氨氮的传质动力学实验及模型计算

Experiment and Calculation of Model on Mass Transfer Kinetics of Removing Ammonia-Nitrogen from Wastewater

测定了废水中氨氮的脱除动力学数据,并建立合适的传质动力学模型对实验数据进行模拟计算。实验中考察了pH、温度、氨氮起始质量浓度等因素对动力学模型参数k的影响,在实验测定的范围内,k随着溶液pH增大而减小,随着溶液温度升高而减小。通过机理分析得到:增大pH和升高温度,促进了废水中氨氮的转化,对传质过程起到强化作用,提高过程进行的速率。为氨氮脱除动力学的进一步理论研究奠定基础,为过程设计提供一定的参考依据。

The kinetics data of removing ammonia-nitrogenous from wastewater were measured in this paper.The fitted kinetics model of mass transfer was established and simulated with the kinetics experimental data.The effects of pH,temperature and the initiative concentration of ammonia-nitrogen on the model parameter k were studied.The value of k was decreasing with increasing pH and temperature of solution.The reasons were gained from mechanism analysis:increasing pH or temperature of solution,translation of ammonia-nitrogen was promoted,the mass transfer process was strengthened and the velocity of process was improved.The results can provide basis for theoretic research on kinetics model of removing ammonia-nitrogen and reference on the design of the process.