Experimental Study of Immobilization of Zn Contaminated Soils

Abstract:

Different binders were used to immobilize artificial Zn contaminated soil. The unconfined compressive strength of the solidified product was measured to estimate its possibility of recycling. And the efficiency of stabilization of Zn in soils was evaluated by the US EPA TCLP toxicity test. The experimental results suggest that quicklime was a good binder for immobilization of Zn contaminated soils. When lime was added, the strength of solidified product was greatly improved, and the leaching concentration of zinc ion dropped significantly. Zn contaminated soil could be successfully cured by the binder C5S5 (5%cement + 5%lime), whose incorporation of lime was largert. The addition of high adsorption clay can improve the efficiency of stabilization.