METHOD AND SYSTEM FOR EXTRACTING AND REMOVING HEAVY METALS IN SOIL

摘要

PROBLEM TO BE SOLVED: To provide a system to control the elution amount and the content of heavy metals to reference values or less, by removing the heavy metals from soil produced in tunnel construction.SOLUTION: A removal system of heavy metals contained in soil, includes: soil washing equipment for eluting the heavy metals contained in the soil into water solution by mixing the soil containing the heavy metals produced in tunnel excavation and the water solution of washing agent; solid-liquid separation equipment separating slurry containing the soil into the soil and the water solution; and heavy metal collection equipment collecting the heavy metals from the water solution. Target heavy metals are As, Cd, Cr, Hg, Cu, Se, Pb, F, B and these salts and these ions.