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Method for repairing soil polluted by heavy metals by using magnesium silicate-hydrothermal carbon composite material

A composite material and magnesium silicate technology, which is applied in the field of remediating heavy metal soil by using magnesium silicate-hydrothermal carbon composite material, can solve the problems of high cost, large amount, loss of nutrient elements, etc. Adsorption performance, the effect of reducing the degree of toxicity

Active Publication Date: 2017-11-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bioremediation method generally has the problems of low repair efficiency and high treatment cost
Traditional physical restoration methods such as landfill, physical leaching, and soil restoration have a large amount of work, high cost, and often lead to soil structure damage and loss of certain nutrients
The chemical immobilization method has been paid attention to because of its simple operation and low investment. Conventional soil remediation agents such as lime and bio-carbon compost have certain problems. If the amount is large, long-term use of lime will affect the physical properties of the soil The overall fertility level will decrease, while compost is easy to decompose in the soil, and the repair effect on heavy metals is not strong

Method used

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  • Method for repairing soil polluted by heavy metals by using magnesium silicate-hydrothermal carbon composite material
  • Method for repairing soil polluted by heavy metals by using magnesium silicate-hydrothermal carbon composite material
  • Method for repairing soil polluted by heavy metals by using magnesium silicate-hydrothermal carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A method of utilizing magnesium silicate-hydrothermal carbon composite material of the present invention to restore cadmium-contaminated soil comprises the following steps:

[0046] (1) Preparation of cadmium-contaminated soil: The test soil was collected from Yuelu Mountain in Hunan Province. The cadmium-contaminated soil was prepared by artificially adding cadmium solution. The cadmium-contaminated soil was incubated at a constant temperature of 25°C for two months to stabilize the form of cadmium. The total cadmium content in the soil was measured to be 8.4mg / kg by the graphite furnace digestion method. Soil remediation experiments were then carried out.

[0047] (2) Remediation of cadmium-contaminated soil: prepare four groups of cadmium-contaminated soils after the same weight steps (1) stabilization, wherein, in the first group, magnesium silicate-hydrothermal carbon composite materials with 1% of the weight of cadmium-contaminated soils are added, uniformly Mix;...

Embodiment 2

[0052] A method of utilizing the magnesium silicate-hydrothermal carbon composite material of the present invention to restore composite heavy metal polluted soil comprises the following steps:

[0053] (1) Collection of complex heavy metal-contaminated soil: The complex heavy metal-contaminated soil was collected from a lead-zinc mine polluted area in Chenzhou, Hunan. It was determined that the lead content was 155 mg / kg; the zinc content was 531.5 mg / kg; and the copper content was 113 mg / kg. It is much higher than the national standard value of soil, and the content of lead, zinc and copper in the surface layer of the soil in this area is more than twice the national soil environmental quality standard.

[0054] (2) Composite heavy metal contaminated soil remediation: prepare four groups of composite heavy metal contaminated soil of the same weight step (1), wherein, in the first group, add magnesium silicate-hydrothermal carbon composite material of 1% of composite heavy met...

Embodiment 3

[0058] Example 3: Research on physical and chemical properties of soil remediation by magnesium silicate-hydrothermal carbon composite materials

[0059] Prepare three groups of cadmium-contaminated soil after stabilization of embodiment 1 step (1) of the same weight, wherein, in the first group, add magnesium silicate-hydrothermal carbon composite material of 1% of cadmium-contaminated soil weight, and mix uniformly; Add magnesium silicate-hydrothermal carbon composite material with 3% weight of cadmium-contaminated soil to the group, and mix uniformly; add magnesium silicate-hydrothermal carbon composite material with 5% weight of cadmium-contaminated soil to the third group, and mix uniformly. The three groups of cadmium-contaminated soils were replenished with deionized water, so that the water retention of cadmium-contaminated soils was maintained at about 60% of the maximum field water capacity. After being stable for 30 days, water was used as solvent to extract the con...

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Abstract

The invention discloses a method for repairing soil polluted by heavy metals by using a magnesium silicate-hydrothermal carbon composite material. The method comprises the step that the magnesium silicate-hydrothermal carbon composite material is fully mixed with the soil polluted by the heavy metals, and therefore the magnesium silicate-hydrothermal carbon composite material reacts with the heavy metals in the soil, the heavy metals can form stable chemical forms, and the soil polluted by the heavy metals is repaired. The magnesium silicate-hydrothermal carbon composite material comprises blocky porous magnesium silicate and spherical porous hydrothermal carbon, and the hydrothermal carbon is loaded on the surface and in the pores of the magnesium silicate. The method has the advantages of being low in cost, simple, high-efficiency and environmental-friendly, and has good repairing effects on the soil polluted by single cadmium and the soil polluted by the composite heavy metals.

Description

technical field [0001] The invention belongs to the technical field of heavy metal soil restoration, and in particular relates to a method for repairing heavy metal soil by using a magnesium silicate-hydrothermal carbon composite material. Background technique [0002] Soil heavy metal pollution is one of the most widely polluted and most harmful environmental problems in today's environmental pollution. Heavy metals in soil have attracted much attention because of their poor mobility, long-term retention, and difficulty in being degraded. According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall situation of the national soil environment is not optimistic, the soil pollution in some areas is relatively serious, the quality of the soil environment of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. . ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 袁兴中熊婷陈晓红谢沅沅肖景锋曾光明
Owner HUNAN UNIV
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