Repairing agent for simultaneously repairing As and Cr polluted soil, as well as preparation and application thereof

A technology for remediation agent and polluted soil, applied in the remediation agent of Cr-contaminated soil, and repairing As field at the same time, it can solve the problem of eliminating heavy metals and so on

Inactive Publication Date: 2017-07-18
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Stabilization technology does not eliminate heavy metals from the source, and long-term stability also needs to be studied urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The concentration of the tested contaminated soil is: Cr 6+ (506.28mg / kg), As 3+ (1080.03mg / kg). pH=5.6.

[0043] Add lime to adjust the soil to pH=7.0.

[0044] The repair potion is prepared according to the following proportions:

[0045] ingredients mass (g) Mass percentage of polluted soil / % Ferrous sulfide 25 2.5 Bentonite 15 1.5 silica 10 1.0 magnesium oxide 25 2.5 calcium polysulfide 25 2.5

[0046] After the prepared restoration agent is mixed with 1kg of contaminated soil, add water until the moisture content reaches 30%, and keep it in a sealed environment for 2 days to obtain the stabilized body.

[0047] According to "Solid Waste Leaching Toxicity Leaching Method - Sulfuric Nitric Acid Method" (HJT299-2007), the leaching experiment was carried out on the stabilized body. The concentration of As in the leachate sample was detected by Thermo ICP-MS analysis. For the specific detection method, refer to the ...

Embodiment 2

[0052] The concentration of the tested contaminated soil is: Cr 6+ (1308.14mg / kg), As 3+ (2343.27mg / kg). pH=5.0, add lime to adjust the soil to pH=7.0.

[0053] The repair potion is prepared according to the following proportions:

[0054] ingredients mass (g) Mass percentage of polluted soil / % Ferrous sulfide 45 4.5 Bentonite 30 3.0 silica 15 1.5 magnesium oxide 10 1.0 calcium polysulfide 50 5.0

[0055] After the prepared restoration agent is mixed with 1kg of contaminated soil, add water until the moisture content reaches 30%, and maintain in the open air for 3 days to obtain the stabilized body.

[0056] According to "Solid Waste Leaching Toxicity Leaching Method - Sulfuric Nitric Acid Method" (HJT299-2007), the leaching experiment was carried out on the stabilized body. The concentration of As in the leachate sample was detected by Thermo ICP-MS analysis. For the specific detection method, refer to the detection meth...

Embodiment 3

[0059] The concentration of the tested soil is: Cr 6+ (2532.33mg / kg), As 3+ (4676.63mg / kg). pH=4.3, add lime to adjust the soil to pH=6.0-9.0.

[0060] The repair potion is prepared according to the following proportions:

[0061] ingredients mass (g) Mass percentage of polluted soil / % Ferrous sulfide 50 5.0 Bentonite 50 5.0 silica 25 2.5 magnesium oxide 25 2.5 calcium polysulfide 50 5.0

[0062] After the prepared restoration agent is mixed evenly with 1kg of heavy metal-containing soil, add water until the moisture content reaches 40%, and maintain it in the open air for 4 days to obtain the stabilized body.

[0063] According to "Solid Waste Leaching Toxicity Leaching Method - Sulfuric Nitric Acid Method" (HJT299-2007), the leaching experiment was carried out on the stabilized body. The concentration of As in the leachate sample was detected by Thermo ICP-MS analysis. For the specific detection method, refer to the det...

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PUM

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Abstract

The invention discloses a repairing agent for simultaneously repairing As and Cr polluted soil. The repairing agent is prepared from the following components in parts by weight: 25-85 parts of inorganic iron salt, 15-75 parts of clay inorganic minerals, 10-30 parts of silicon dioxide crystallizing agent, 10-30 parts of a magnesium compound and 25-80 parts of sulfide, wherein the inorganic iron salt is one or an arbitrary combination of more than two of ferric sulfate, goethite, ferrous chloride and ferrous sulfide; the magnesium compound is one or an arbitrary combination of more than two of magnesium oxide, dolomite and magnesite; and the sulfide is one or an arbitrary combination of more than two of calcium polysulfide, sodium sulfide and potassium sulfide.

Description

technical field [0001] The invention belongs to the field of soil heavy metal pollution treatment and restoration, and in particular, the invention relates to a restoration agent for simultaneously repairing As and Cr polluted soil and a method for using the same. Specifically, it relates to the preparation and application method of a remediation agent for heavy metal As and Cr heavy metal polluted soil, through lattice encapsulation, (co)precipitation, absorption / adsorption, complexation / chelation, ion Exchange and mineralization transform heavy metal ions into insoluble substances such as hydroxides, complexes / chelates, and carbonate minerals and fix them in the soil. Background technique [0002] In April 2014, the survey results of the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the overall situation of the national soil environment is not optimistic. The actual su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08B09C1/08
CPCB09C1/08C09K17/08
Inventor 吕正勇魏丽申坤任贝甄胜利朱湖地佟立永苗竹
Owner BEIJING GEOENVIRON ENG & TECH
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