HEAVY METAL INSOLUBILIZED COMPOSITION AND METHOD FOR REPAIRING HEAVY METAL CONTAMINATED SOIL

摘要

PROBLEM TO BE SOLVED: To provide a heavy metal insolubilized composition high in fluidity, good in permeability into the soil and excellent in the insolubilization effect of heavy metals, and a method for repairing heavy metal contaminated soil excellent in the insolubilization effect of heavy metals in heavy metal contamination soil and capable of easily treating heavy metal contaminated soil at the original position.SOLUTION: Provided is a heavy metal insolubilized composition containing urease generated microorganisms, urea, calcium ions and iron ions, in which, provided that the content of the calcium ions is defined as A(mg/L) and the content of the iron ions is defined as B(mg/L), the relation between the A and B satisfies the conditions of the following inequality (1), the following inequality (2) and the following inequality (3). Also provided is a method for repairing heavy metal contaminated soil including the process of injecting the heavy metal insolubilized composition into treatment object soil: the inequality (1):2/1≤A/B≤20/1(based on mass), the inequality (2):54 mg/L≤A≤3,000 mg/L and the inequality (3):15 mg/L≤B≤300 mg/L.SELECTED DRAWING: Figure 1