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A heavy metal soil remediation agent and remediation method based on magnesium oxide-montmorillonite composite material mixed biochar

A technology of soil remediation agent and composite material, which is applied in the field of heavy metal soil remediation, can solve the problems of reducing the Cd value of rice, achieve the effect of reducing the content and improving the physical and chemical properties of the soil

Active Publication Date: 2021-05-25
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Make up for the defect that MgO alone cannot make rice survive, and reduce the Cd value in rice

Method used

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  • A heavy metal soil remediation agent and remediation method based on magnesium oxide-montmorillonite composite material mixed biochar
  • A heavy metal soil remediation agent and remediation method based on magnesium oxide-montmorillonite composite material mixed biochar
  • A heavy metal soil remediation agent and remediation method based on magnesium oxide-montmorillonite composite material mixed biochar

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0062] A method of utilizing magnesium oxide-montmorillonite composite material mixed biochar to remediate cadmium-contaminated soil of the present invention comprises the following steps:

[0063] (1) Preparation of cadmium-contaminated soil: The test soil was collected from the Yunyuan Base of Hunan Agricultural University in Changsha. The cadmium-contaminated soil was prepared by artificially adding cadmium solution. becoming steady. The total cadmium content in the soil was measured to be 1.2mg / kg by the graphite furnace digestion method. Soil remediation experiments were then carried out.

[0064] (2) Restoration of cadmium-contaminated soil: prepare 15 plastic flower pots, add 4 kg of the cadmium-contaminated soil stabilized in step (1) into each plastic flower pot, wherein, whether to add any repair agent in the first group, as a blank control group. Add 5% magnesia-montmorillonite composite material of cadmium-contaminated soil weight in the second group, and mix ev...

experiment example 2

[0073] A kind of method of utilizing magnesia-montmorillonite composite material mixed biochar of the present invention to remediate composite heavy metal polluted soil comprises the following steps:

[0074] (1) Preparation of complex heavy metal-contaminated soil: The cadmium-contaminated soil was prepared by artificially adding cadmium, lead, copper and zinc solutions, and the cadmium-contaminated soil was incubated at a constant temperature of 25°C for two months to stabilize the form of heavy metals. The content of total cadmium, total lead, total copper and total zinc in the soil measured by graphite furnace digestion method was 1.5mg / kg, 1198.6mg / kg, 208.6mg / kg respectively. Soil remediation experiments were then carried out.

[0075] (2) Remediation of compound heavy metal-contaminated soil: prepare four groups of the same weight of compound heavy metal-contaminated soil in step (1), wherein, the first group with or without any remediation agent is used as a blank cont...

experiment example 3

[0079] Experimental example 3: Study on physical and chemical properties of soil remediation by magnesium oxide-montmorillonite composite material and biochar

[0080] Three groups of cadmium-contaminated soil stabilized in step (1) of Example 1 with the same weight were prepared, wherein, the first group with or without any restorative agent was used as a blank control group. Add 5% magnesia-montmorillonite composite material of cadmium-contaminated soil weight in the second group, and mix evenly; Add 5% magnesia-montmorillonite composite material and biochar, magnesium oxide -The mass ratio between montmorillonite composite material and biochar is 1:9, uniformly mixed; in the fourth group, 5% magnesia-montmorillonite composite material and biochar by weight of cadmium-contaminated soil are added, magnesia-montmorillonite composite material and biochar, magnesia-montmorillonite composite material The mass ratio between the destoned composite material and biochar is 2:8, unifo...

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Abstract

The invention "a heavy metal soil restoration agent and restoration method based on magnesium oxide-montmorillonite composite material mixed with biochar" belongs to the technical field of soil restoration. The heavy metal soil remediation agent includes: magnesium oxide-montmorillonite composite material and biochar; the montmorillonite is a layered structure; the magnesium oxide-montmorillonite composite material is magnesium oxide loaded on montmorillonite Surface and interlayer materials. The soil remediation agent and the remediation method of the invention have the characteristics of good heavy metal stabilizing effect, low economic cost, environmental friendliness and the like, and have good remediation effect on heavy metals.

Description

technical field [0001] The invention belongs to the technical field of heavy metal soil restoration, and in particular relates to a heavy metal soil restoration agent and a restoration method based on magnesium oxide-montmorillonite composite material mixed biochar. Background technique [0002] Human activities such as mining, ore smelting, and urbanization have caused heavy metals such as Cd, Pb, Cu, and Zn to enter nature and human society, affecting water, soil, and crops. In the soil survey in the past ten years, the distribution of heavy metal-contaminated soil is wide, and the proportion of polluted soil is high. The probability of soil heavy metal pollution in China is about 16.67%, which means that 1 / 6 of the cultivated land in China may be affected by heavy metal pollution; the total area of ​​cultivated land is 68.12%, 15.22%, 14.49%, 1.45% and 0.72%, respectively , the proportion of relatively clean, slightly polluted, moderately polluted, and heavily polluted l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/08B09C1/08A01B79/00C09K101/00C09K109/00
CPCA01B79/00B09C1/08C09K17/08C09K2101/00C09K2109/00
Inventor 袁兴中杨羽茜熊婷蒋龙波彭叶琼陈鸿鹄姚赛
Owner HUNAN UNIV
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