METHOD FOR PURIFICATION OF SOILS CONTAMINATED WITH HEAVY METALS

摘要

PURPOSE: A remediation method of soil contaminated by heavy metal is provided, which can remove heavy metal from wide range of soil contaminated by various kind and concentration of heavy metals. The elution composition can be easily decomposed naturally by microorganism present in soil, so that secondary contamination of soil by elution composition can be minimized. CONSTITUTION: The method comprises the following steps: (i) excavate contaminated soil and install well for suction of ground water; (ii) prepare an elution composition which is based on 10-100 mM of a low molecular organic acid that is selected from a group consists of citric acid, acetic acid and oxalic acid and has 5-7 of pH; (iii) inject the prepared elution composition into the contaminated soil for forming a complex compound of low molecular organic acid and heavy metal.