SO4^2-在复垦土壤中的运移试验与模拟研究

Experiment and simulation research on the migration of SO4^2-in the reclaimed soil

为揭示采煤塌陷坑积水中SO4^2-在不同介质土地复垦土壤内的运移特征,以济宁市兴隆庄煤矿采煤塌陷区为例,以不同复垦土壤为原料,建立黄河淤沙、粘性褐土、淤沙-褐土混合土这3组土柱,通过一维饱和土柱淋滤试验研究不同复垦土壤对SO4^2-的吸附作用,利用Hydrus-1D软件建立SO4^2-在3种土壤中的运移模型。研究结果表明,3种土柱对SO4^2-都有一定的吸附作用,混合土土柱对SO4^2-吸附有一定的迟滞效应;SO4^2-在黄河淤沙、褐土、混合土中的纵向弥散度分别为0.673 cm、0.258 cm、0.379 cm,研究成果为监测SO4^2-在复垦土壤-地下水系统中的运移提供了理论依据;黄河淤沙作为填埋材料,其自身不会造成塌陷区内SO4^2-含量的增加,填埋治理后也不利于SO4^2-的进一步析出及运移。

In order to reveal the migration regularity of SO4^2-from the sunken pit ponding in different reclaimed soil,three groups of soil column,i.e.Yellow River silt,clayey cinnamon soil and silt cinnamon mixed soil,were built in the mining subsidence area of Xinglongzhuang Coal Mine in Jining with different reclaimed soil as raw materials.The adsorption of SO4^2-on different reclaimed soils was studied by one-dimensional saturated soil column leaching experiment,and the migration model of SO4^2-in three soils was established by using Hydrous-1D software.The results showed that the three kinds of soil columns had a certain adsorption effect on SO4^2-and the mixed soil columns had a certain hysteresis effect on SO4^2-adsorption.The longitudinal dispersion of SO4^2-in the Yellow River silt,cinnamon soil and mixed soil was 0.673 cm,0.258 cm and 0.379 cm,respectively.The research results provided a theoretical basis for the monitoring of SO4^2-migration in reclaimed soil-groundwater system.As a landfill material,the Yellow River silt would not increase the SO4^2-content in the subsidence area,and it was not conducive to the further precipitation and migration of SO4^2-after landfill treatment.