重金属污染物在土壤中的扩散规律及埋置策略研究

为了探索重金属污染物在土壤中的扩散规律,本文基于三维扩散方程,推导出了空间、时间和扩散系数等因素对埋置点周围重金属污染物浓度的影响规律。在此基础上,分析比较了集中埋置和分散埋置方法对重金属污染物浓度分布影响的异同。结果表明:在其他条件相同时,某一空间位置的浓度随扩散时间和扩散系数的增大先增大后逐渐减小,最后曲线趋于平缓;相同扩散时间情况下,浓度随着扩散半径的增大而减小,当扩散半径大于一定值时,浓度趋于零。对同量的污染物的三种不同的埋置方案进行分析发现:埋置点越少,其附近的浓度越高,而埋置点越多,远处的浓度越低。

Study on diffusion law of heavy metal in soil and its buried strategy

In order to investigate the diffusion law of heavy metal pollutants in soil, the paper deduced the effect law of space, time and diffusion coefficient on the pollutant concentration of heavy metal around the buried point based on three-dimensional diffusion equation.It also analyzed the influence of differences between two buried methods such as namely centralized and decentralized buried approaches on pollutant concentration distribution of heavy metal.The results show that when the other conditions are the same, the concentration of a spatial position increases first and then decrease with the increase of both diffusion time and diffusion coefficient,and Finally the curve tends to be gentle; when the diffusion time keeps constant, the concentration decreases with the increase of diffusion radius, and trends to zero at the end. After comparing three different buried methods, it found that the fewer the buried points, the higher the nearby concentration, and the more buried points, the lower the concentration at far positions.