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Soil remediation agent and restoration stabilizing remediation method for hexavalent-chromium-contaminated soil

A technology of soil remediation agent and remediation method, which is applied in the field of soil remediation agent and hexavalent chromium-contaminated soil reduction and stabilization restoration, which can solve the problems of lack of key control parameters and poor long-term stability effect, and improve soil physical and chemical properties , the effect of abundant pores and high porosity

Inactive Publication Date: 2018-09-21
HUATIAN ENG & TECH CORP MCC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the external conditions such as pH, Eh, etc. change, stable or low biological toxicity heavy metals will have the disadvantage of reverse reaction. At present, there is a relative lack of key control parameters in the process of restoring hexavalent chromium-contaminated soil in China, and the medium- and long-term stability effect relatively poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Collected from the actual hexavalent chromium-contaminated soil of an electroplating factory in northern Anhui, the total chromium content is 9096.48mg / kg.

[0035] Air-dry the collected soil indoors to remove impurities such as stone particles, grind it, and pass it through a 2mm sieve to obtain contaminated soil after simple treatment.

[0036] The biochar is a mixture of rice straw and sodium sulfide as a raw material, the mass percentage of the rice straw and sodium sulfide is 19:1, and it is heated in vacuum under the conditions of a system pressure of 20kPa and a pyrolysis temperature of 500°C. It was decomposed for 30 minutes, and the particle size obtained by ball milling was a solid powder with a particle size below 3mm.

[0037] Calcium polysulfide 40%;

[0038] Biochar 20%;

[0039] Ferrous sulfate heptahydrate 40%;

[0040] The remediation agent is mixed with the above-mentioned polluted soil at a mass ratio of 1:10, mixed evenly, adjusted to a moisture c...

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Abstract

The invention discloses a soil remediation agent and a restoration stabilizing remediation method for hexavalent-chromium-contaminated soil. The soil remediation agent is composed of the following rawmaterials of, by mass, 35%-45% of calcium polysulfide, 15%-25% of biomass charcoal and 35-45% of ferrous sulfate, wherein the sum of the mass percentages of the raw materials is 100%. The restorationstabilizing remediation method for the hexavalent-chromium-contaminated soil comprises the step that the soil remediation agent is added into the chromium-contaminated soil. According to the remediation agent, the biomass charcoal is obtained through vacuum pyrolysis of biomass, and the biomass charcoal prepared under the vacuum condition is high in porosity and adsorption value; rice straw biomass serves as a raw material, resources are fully utilized, and environmental pollution caused by burning of the rice straw biomass is avoided; and the biomass charcoal obtained through vacuum pyrolysis has the advantages of being large in specific surface area, rich in pore canal, liable to adsorb various heavy metal ions, and capable of reducing the concentration of the mobility heavy metal ionsin the soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated soil, and in particular relates to a soil remediation agent and a method for reducing and stabilizing remediation of hexavalent chromium-contaminated soil. Background technique [0002] Chromium is one of the essential trace elements for the human body. It participates in the process of fat metabolism, sugar metabolism, and maintains the normal metabolism of cholesterol. Chromium deficiency can affect people's appetite, harm the human circulatory system, and lead to symptoms such as atherosclerosis. A large amount of chromium is harmful to the human body: the chromium content in drinking water exceeds 400 times, which will directly cause symptoms such as digestive disorders, diarrhea, and erosion of the mouth; direct skin contact with hexavalent chromium solution exceeding 100mg / L will induce rashes and skin ulcers; Chromium in the human body can also cause respiratory disease...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08C09K17/06
CPCB09C1/00B09C1/08B09C2101/00C09K17/06
Inventor 项萌夏溢焦朋朋刘金光王浩程寒飞
Owner HUATIAN ENG & TECH CORP MCC
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