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污染控制技术及原理

摘要：为了研究巢湖流域富磷地质岩石中磷素(即岩源磷)的释放动力学特征,用0.5mol·L^-1NaHCO₃连续提取法对岩样进行岩源磷释放的动力学实验,并应用统计学原理建立化学动力学的非机理模型研究岩源磷的释放过程.同时,选用零级方程、一级方程、二级方程、抛物线方程、Elovich方程、权函数方程等6个动力学模型进行解析过程拟合,分析岩源磷动力学释放的主要化学过程.结果显示,随着反应时间的延长,磷的释放量均不断增加,释放速率随时间的延长而下降.选用的几种动力学模型中,一级方程、Elovich方程、权函数方程和抛物线方程对岩源磷的释放动力学过程均能很好地拟合,其中以一级方程拟合度最佳.岩源磷的释放动力学过程是一个以扩散过程为主的反应过程.

Abstract：The release kinetics characteristics of phosphorus in rocks (rock P) of the Chaohu lake basin were investigated using continuous extraction with 0.5 mol·L^-1 NaHCO₃. And the application of statistical principles established in the chemical kinetics model to study the mechanism of rock source phosphorus release process. Also,the zero-order、first-order、second-order、simple Elovich,power function,and parabolic diffusion kinetics model were chose for analytical process,then fitting the main chemical process of the release mechanism of rock phosphorus.The results show that the amount of the released phosphorus increased with the time,while the rate of phosphorus released declined with time. Several dynamic models,including the first-order,simple Elovich,power function,and parabolic diffusion kinetics models,were found to fit the data and described the rock Prelease kinetics well. The first-order model had the best fit. The data indicate that the release mechanism of rock phosphorus is a simple first-order kinetic reaction that mainly involves diffusion.