基于HYDRUS-1D模型研究重金属汞在土壤中的运移规律

Study on the Transport Law of Heavy Metal Mercury in Soil Based on the HYDRUS-1D Model

为了研究重金属汞在不同质地土壤剖面的运移规律,文章选取某汞冶炼企业场地为研究对象,运用HYDRUS-1D模型建立重金属汞运移模型,模拟其在土壤剖面中的运移规律。所建立的模型能够模拟重金属汞在土壤剖面中分布和运移的时空变化规律:若重金属汞渗漏5.0 d后得到控制,则其最大运移距离达150 cm;重金属汞进入土壤后约1.5 d到达土壤剖面30 cm深处,约9.5 d后到达观测点300 cm观测点,约27.0 d后以恒定含量穿透土壤带进入包气带或潜水含水层。有色金属冶炼企业场地土壤重金属污染风险大,企业应根据企业实情,结合导则规范等提出综合防治措施。

In order to study the transport patterns of heavy metal mercury in different soil profiles with different textures,this paper selects a non-ferrous metal smelting enterprise site as the research object,and uses the HYDRUS-1D model to establish a heavy metal mercury transport model,simulating its transport law in the soil profile.The established model can simulate the spatiotemporal changes in the distribution and transport of heavy metal mercury in soil profiles.If the heavy metal mercury is controlled after 5.0 d of leakage,its maximum transport distance will reach 150 cm.The heavy metal mercury enters the soil and reaches a depth of 30 cm in the soil profile about 1.5 d.After about 9.5 d,it reaches the observation point of 300 cm.After about 27.0 d,it penetrates the soil zone at a constant concentration and enters the aeration zone or groundwater aquifer.There is a high risk of soil heavy metal pollution in non-ferrous metal smelting enterprises.Enterprises should propose comprehensive prevention and control measures based on their actual situation and in combination with guidelines and regulations.