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Composite soil remediation agent, and preparation method and application thereof

A soil remediation agent and a technology for polluted soil, which is applied in the field of heavy metal soil remediation, and can solve problems such as poor remediation effect and unstable remediation effect of single activated carbon/biochar

Active Publication Date: 2020-09-18
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of unstable and poor repairing effect of existing single activated carbon / biochar, the present invention provides a soil repairing agent and its preparation method and application

Method used

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  • Composite soil remediation agent, and preparation method and application thereof
  • Composite soil remediation agent, and preparation method and application thereof
  • Composite soil remediation agent, and preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0078] The embodiment of this group provides a kind of preparation method of soil remediation agent, it is characterized in that, comprises the following steps:

[0079] S1, dispersing montmorillonite, magnesium chloride, and ferrous oxalate into water respectively to obtain a dispersion of montmorillonite, a dispersion of magnesium chloride, and a dispersion of ferrous oxalate;

[0080] S2, adding cetyltrimethylammonium bromide and ammonia water to the montmorillonite dispersion to react to obtain the first step dispersion; adding the magnesium chloride dispersion and ferrous oxalate dispersion to the React in the first step dispersion liquid, obtain the second step dispersion liquid;

[0081] S3. After hydrothermal treatment of the second-step dispersion liquid, washing, drying, and calcining to obtain magnesium / iron-montmorillonite.

[0082] Also includes: S4, mixing the magnesium / iron-montmorillonite material with biochar at a mass ratio of 1:9-10:0 to obtain the soil rem...

experiment example 1

[0100] A kind of method of utilizing magnesium / iron-montmorillonite and biochar composite material of the present invention to repair composite heavy metal polluted soil comprises the following steps:

[0101] (1) Preparation of compound heavy metal-contaminated soil: The test soil was collected from farmland in Yuelu District, Changsha, Hunan. The compound heavy metal-contaminated soil was prepared by artificially adding zinc, copper, lead, and cadmium solutions, and the compound heavy metal-contaminated soil was incubated at a constant temperature of 25°C. Two months, so that the form of heavy metals tends to be stable. The contents of total zinc, copper, lead and cadmium in the soil measured by graphite furnace digestion method are 650-840mg / kg, 150-170mg / kg, 750-800mg / kg, 3.4-3.8mg / kg respectively. Soil remediation experiments were then carried out.

[0102] (2) Remediation of compound heavy metal contaminated soil: prepare five groups of compound heavy metal contaminated...

experiment example 2

[0107] Research on physical and chemical properties of soil remediation by composite remediation agent:

[0108] Prepare five groups of compound heavy metal-contaminated soil after embodiment (1) stabilization of the same weight, wherein, the first group does not add any restorative agent, as blank control group (CK); The second group adds 3% of compound heavy metal-contaminated soil weight Composite soil remediation agent (magnesium / iron-montmorillonite: biochar=0:10) (M0H10); in the third group, add the composite soil remediation agent (magnesium / iron-montmorillonite: Biological charcoal=1:9) (M1H9), uniformly mixed; In the fourth group, add composite soil remediation agent (magnesium / iron-montmorillonite: biochar=3:7) (M3H7) of 3% of composite heavy metal polluted soil weight , uniformly mixed; in the fifth group, add composite soil remediation agent (magnesium / iron-montmorillonite: biochar=4:6) (M4H6) of composite heavy metal polluted soil weight 3% in the fifth group, uni...

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Abstract

The invention discloses a composite soil remediation agent, and a preparation method and application thereof, and belongs to the technical field of heavy metal soil remediation. The composite soil remediation agent is prepared from magnesium / iron-montmorillonite and biochar. The magnesium / iron-montmorillonite can effectively adsorb and fix ionic heavy metals in soil, so that the bioavailability ofthe ionic heavy metals is reduced, and the toxic action of the heavy metals on a biologic chain is further reduced. The repair effects of zinc, copper, lead and cadmium can reach 50.29-64.50%, 71.11-85.04%, 85.10-93.87% and 2.75-59.50% respectively.

Description

technical field [0001] The invention belongs to the technical field of heavy metal soil restoration, and in particular relates to a composite soil restoration agent and its preparation method and application. 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 long-term, irreversible, concealed and other characteristics. At present, the polluted arable land in my country is about 8.3% of the total arable land, and about 100,000 square kilometers of arable land are polluted, of which about 90% are related to heavy metal pollution. According to the "National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the number of soil pollution sites accounted for 19.4% of the total number of survey sites. 7.0%, 1.5%, 0....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K17/04B09C1/08B01J20/12B01J20/30
CPCB01J20/12B01J20/30B09C1/08B09C2101/00C09K17/04C09K17/08
Inventor 袁兴中张含妍熊婷钦陈程
Owner HUNAN UNIV
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