Method for measuring solid-liquid separation ratio of contaminated soil by decanter classification, method for cleaning contaminated soil using the same, and method for cleaning arsenic-contaminated soil

摘要

PROBLEM TO BE SOLVED: To provide a method for measuring a solid-liquid separation ratio of contaminated soil by decanter classification in which a ratio of the purification soil can be increased, even if a ratio for microparticles is high, while reducing the weight of the processing soil exceeding an elution amount reference value, and provide a method for cleaning the contaminated soil and a method for cleaning the arsenic pollution soil.SOLUTION: A specific gravity of the contaminated soil ρ, a specific gravity ρfor solid recovery exceeding the classification point obtained by performing solid-liquid separation the contaminated soil using the decanter classification based on a predetermined classification point, and a specific gravity ρof the separation muddy water of the slurry shape containing a clear supernatant liquid separated for solid-liquid and for the microparticles not more than the classification point are measured, respectively. A solid fraction DSof the contaminated soil, a solid fraction DSfor the solid recovery, and a solid fraction DSof the separation muddy water are found, respectively. Further, a weight x for the solid recovery is found from the solid fraction DSof the contaminated soil, the solid fraction DSfor the solid recovery, and the solid fraction DSof the separation muddy water, and thereby a solid-liquid separation ratio (x:1-x) of the solid recovery and the separation muddy water is found.SELECTED DRAWING: Figure 2