Hexavalent chromium contaminated soil in-situ remediation method
A technology for in-situ remediation of contaminated soil, applied in the field of in-situ remediation of hexavalent chromium-contaminated soil, which can solve the problems of hexavalent chromium leaching, pollution, and polluted surrounding soil, and achieve stable trivalent chromium, simple operation method, and cheap raw materials Effect
Examples
Embodiment 1
[0021] The object of the embodiment is the soil polluted by the chromium slag leachate of a certain chemical plant. The chromium content in the soil is 5628.9 mg / kg of hexavalent chromium. Utilize the method of the present invention to repair hexavalent chromium polluted soil main steps are as follows:
[0022] 1) 10 kilograms of sodium thiosulfate are dissolved in 90 kilograms of water to be configured as a reducing agent with a mass concentration of 10%.
[0023] 2) dissolving 10 kg of disodium hydrogen phosphate in 90 kg of water to prepare a stabilizer with a mass concentration of 10%.
[0024] 3) 100 kilograms of hexavalent chromium-contaminated soil and 50 kilograms of reducing agent are fully stirred and mixed, and the stirring time is 2 hours, and the obtained soil is dried;
[0025] 4) 100 kg of reduced and dried soil and 50 kg of stabilizer were fully stirred and mixed for 2 hours, and the obtained soil was dried.
[0026] After the above steps are completed, the ...
Embodiment 2
[0028] The object targeted by the embodiment is certain soil polluted by hexavalent chromium. The chromium content in the soil is 526.3 mg / kg of hexavalent chromium. Utilize the method of the present invention to repair hexavalent chromium polluted soil main steps are as follows:
[0029] 1) Dissolving 1 kg of sodium sulfide in 90 kg of water to prepare a reducing agent with a mass concentration of 0.1%.
[0030] 2) Dissolving 1 kilogram of phosphoric acid in 99 kilograms of water is configured as a stabilizer with a mass concentration of 0.1%.
[0031] 3) 100 kilograms of hexavalent chromium-contaminated soil and 200 kilograms of reducing agent are fully stirred and mixed, and the stirring time is 2 hours, and the obtained soil is dried;
[0032] 4) 100 kg of reduced and dried soil and 300 kg of stabilizer were fully stirred and mixed for 2 hours, and the obtained soil was dried.
[0033] After the above steps are completed, the concentration of hexavalent chromium in the ...
Embodiment 3
[0035] The object targeted by the embodiment is certain hexavalent chromium-contaminated soil. The chromium content in the soil is 2572.4 mg / kg of hexavalent chromium. Utilize the method of the present invention to repair hexavalent chromium polluted soil main steps are as follows:
[0036] 1) 5 kilograms of sodium thiosulfate and 5 kilograms of ferrous sulfite are dissolved in 90 kilograms of water to prepare a reducing agent with a mass concentration of 10%.
[0037] 2) Dissolving 5 kilograms of sodium phosphate and 5 kilograms of disodium hydrogen phosphate in 190 kilograms of water to prepare a stabilizer with a mass concentration of 5%.
[0038] 3) 100 kilograms of hexavalent chromium-contaminated soil and 50 kilograms of reducing agent are fully stirred and mixed, and the stirring time is 2 hours, and the obtained soil is dried;
[0039] 4) 100 kg of reduced and dried soil and 50 kg of stabilizer were fully stirred and mixed for 2 hours, and the obtained soil was dried...
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Description
Claims
Application Information
- IPC
- B09C1/08
- Inventors
- ει³η; ζθΈι