Method for repairing cadmium and arsenic polluted soil

• Main Authors: JIAO ZHILIANG, YANG RENJIE, XU YI, SUN GUOHONG
• Format: Patent
• Language: Chinese; English
• Published: 24.12.2021
• Subjects: DISPOSAL OF SOLID WASTE; PERFORMING OPERATIONS; RECLAMATION OF CONTAMINATED SOIL; RECLAMATION OF CONTAMINED SOIL SOIL; TRANSPORTING

The invention relates to a method for repairing cadmium and arsenic polluted soil, which comprises the following steps: 1, adding sodium percarbonate into the cadmium and arsenic polluted soil, fully and uniformly stirring, and standing for 2-4 hours to obtain oxidized cadmium and arsenic polluted soil, the addition amount of the sodium percarbonate being 0.5-3 wt% of the mass of the soil; 2, adding hematite powder and a calcium-based compound into the cadmium and arsenic contaminated soil subjected to oxidation treatment, after sufficient and uniform stirring is conducted, conducting stabilization for 3-7 days, the addition amount of the hematite powder being 0.5-5 wt% of the mass of the soil, and the addition amount of the calcium-based compound being 0.5-2.5 wt% of the mass of the soil; 3, spraying 3-mercaptopropylmethoxysilane to the surface of the soil after the soil is stabilized for 3-7 days in the step 2, then fully stirring the soil to be uniform, and conducting stabilization for 5-10 days. The remed