赤泥阻隔层对重金属污染物迁移过程影响试验研究

Experimental Study on the Influence of Red Mud Barrier Layer on the Migration Process of Heavy Metal Pollutants

为了了解赤泥固体废弃物对重金属的吸附治理效果,通过一维土柱渗流试验,分析重金属离子对赤泥颗粒的吸附特性、赤泥作为污染物隔离层对重金属迁移的影响以及赤泥对不同重金属的截污能力。研究结果表明:赤泥隔离层对三种重金属离子的截污能力存在显著差异,对Pb(Ⅱ)的截污能力优于Cd(Ⅱ),而Cd(Ⅱ)的截污能力又优于Cu(Ⅱ)。这一顺序与赤泥对三种重金属离子的吸附情况一致,赤泥隔离层对三种重金属离子的截污能力受其吸附能力的影响。赤泥是一种相对有效的污染物隔离材料,不仅可以防止渗透,还能最大限度地减少土壤中的重金属离子活性。

In the context of remediation of heavy metal pollution and reutilization of red mud solid waste,the adsorption characteristics and influencing mechanisms of heavy metal ions on red mud particles were analyzed.Subsequently,the influence of red mud as a pollutant isolation layer on the migration of heavy metals and the differences in their adsorption capacities for different heavy metals were investigated through one-dimensional column percolation experiments.The results demonstrate significant differences in the adsorption capacities of the red mud isolation layer for the three heavy metal ions.The adsorption capacity for Pb(Ⅱ)is greater than that for Cd(Ⅱ),and the capacity for Cd(Ⅱ)is higher than that for Cu(Ⅱ).This sequence corresponds to the adsorption of the three heavy metal ions by red mud,indicating that the adsorption capacity of the red mud isolation layer for the three heavy metal ions is influenced by their adsorption abilities.The study concluded that red mud is a relatively effective pollutant isolation material,which can prevent permeation and minimize the activity of heavy metal ions in the soil.