Evaluating the arsenic attenuation of soil amended with calcium–magnesium composites of different particle sizes

An attenuation layer composed of ground mixed with stabilising agents can prevent the contamination surrounding area when using soils and rocks geogenic contaminants in embankments. The optimum particle size agent must be selected based on requirements construction site because mechanical chemical properties are site-specific. However, relationship between performance soil–agent mixtures has yet to fully clarified. This study employs batch sorption tests evaluate arsenic by a soil calcium–magnesium composite different sizes, ranging from powder particles (<0.075 mm size) granular diameters 2.0 9.5 mm. Amended more effectively attenuates contaminant than original soil. In one experiment, (between mm) for amendment increased soil’s partition coefficient Kd 14.5 22.2 cm3/g, which is 50% improvement attenuation. Using smaller greater impact. increases linearly as decreases down 0.075 laboratory tests, simulations one-dimensional advection–dispersion equation demonstrate durability layer. Both show promise materials.