A method for repairing hexavalent chromium-contaminated soil and groundwater

A remediation method and technology for contaminated soil, applied in the restoration of contaminated soil, the treatment of contaminated groundwater/leachate, water pollutants, etc. impact and other issues, to achieve the effect of ensuring fluidity and workability, enhancing buffer capacity, and avoiding permeation loss
CN104624632BActive Publication Date: 2017-01-18SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2017-01-18

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Abstract

The invention discloses a remediation method for hexavalent chromium polluted soil and underground water. The remediation method comprises the following steps: step (10): putting a pile machine in place; step (20): independently injecting acidified bentonite slurry loaded with active carbon powder and bentonite slurry loaded with zero-valent iron powder into the ground by using stirring and injection equipment and stirring; step (30): detecting the reduction effect of hexavalent chromium in the soil and the underground water; step (40): injecting bentonite and industrial waste alkali mixed slurry; and step (50): detecting the remediation effect of hexavalent chromium and trivalent chromium. By virtue of the remediation method, remediation chemicals can be in direct and sufficient contact with the soil and the underground water to react, so that the hexavalent chromium in the soil and the underground water can be completely reduced; meanwhile, an indissolvable stable compound is formed by the trivalent chromium and the useless loss of the remediation chemicals can be reduced; the potential of hydrogen of a stratum is balanced; and the remediation method is suitable for the large-area hexavalent chromium polluted stratums different in potential of hydrogen and moisture content.
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Description

technical field

[0001] The invention belongs to the technical field of civil engineering and environmental geotechnical engineering, and specifically relates to a restoration method of hexavalent chromium-contaminated soil and groundwater, which can be used in restoration projects of hexavalent chromium-contaminated strata in landscaping and construction , especially suitable for low-permeability hexavalent chromium polluted clay and silt soil. Background technique

[0002] Unlike other toxic heavy metals, chromium exists in two valence states of hexavalent and trivalent in nature. Due to its oxidizing properties, hexavalent chromium can strongly corrode and destroy organisms. It is one of the three internationally recognized carcinogenic metals, while trivalent chromium is an essential trace nutrient element for humans and animals, but excessive intake will also cause Harmful to the human body. Chromium and its compounds have been widely used in various fields of modern i...

Claims

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