土壤中VOCs的污染特征及成因研究

Pollution Characteristics and Causes of VOCs in Soil

为了准确实施土壤资源环境治理和保护,提出土壤中VOCs的污染特征及成因分析方法。采用高斯烟团模型对模拟VOCs扩散规律,根据扩散结果将VOCs的污染特性分为三种。研究结果表明,在土壤包气带粉土层和包气带砂土层中,可用指数模型近似模拟VOCs的扩散规律,拥有较强渗透性的砂性土层是挥发性有机污染物聚集概率较高的地方,VOCs在粉土层中的浓度通常情况下要低于挥发性有机物在砂土层中的浓度。通过对土壤中挥发性有机物VOCs的污染特征和成因进行分析可以为土壤污染治理提供技术依据。

In order to accurately implement the treatment and protection of soil resources and environment,the pollution characteristics and cause analysis method of VOCs in soil were put forward.Gaussian puff model is used to simulate the diffusion law of VOCs.According to the diffusion results,the pollution characteristics of VOCs are divided into three types.The results show that the exponential model can be used to approximate the diffusion law of VOCs in the silty soil layer and sandy soil layer of the aeration zone.The sandy soil layer with strong permeability is the place with high accumulation probability of volatile organic pollutants,and the concentration of VOCs in the silty soil layer is usually lower than that in the sandy soil layer.The analysis of the pollution characteristics and causes of VOCs in soil can provide technical basis for soil pollution control.