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Repair medicament for compound heavy metal polluted soil as well as preparation and application method thereof

A technology of polluted soil and remediation agents, applied in the direction of chemical instruments and methods, applications, soil conditioning materials, etc., can solve the problems of limited types of heavy metals, only in-situ treatment, long maintenance time, etc.

Inactive Publication Date: 2016-12-21
BEIJING GEOENVIRON ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maintenance time of this invention is too long, it can only be treated in situ, and the types of heavy metals treated are limited

Method used

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  • Repair medicament for compound heavy metal polluted soil as well as preparation and application method thereof
  • Repair medicament for compound heavy metal polluted soil as well as preparation and application method thereof
  • Repair medicament for compound heavy metal polluted soil as well as preparation and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The concentrations of the heavy metal contaminated soil tested are: Cr (66.28mg / kg), Ni (57.84mg / kg), Cu (450.90mg / kg), Zn (5431.00mg / kg), As (6080.00mg / kg), Cd ( 37.02mg / kg) and Pb (2936.86mg / kg).

[0067] The remediation agent for compound heavy metal polluted soil is prepared according to the following ratio:

[0068] ingredients

mass (g)

Mass percentage in heavy metal polluted soil / %

calcium phosphate

20

2

ferric sulfate

25

2.5

Light Burned Magnesium Oxide

100

10

Bentonite

10

1

humic acid

25

2.5

Powdered silica

25

2.5

[0069] After the prepared restoration agent is mixed with 1kg of heavy metal-contaminated soil, add water until the moisture content reaches 30%, and maintain in the open air for 48 days.

[0070] According to "Solid Waste Leaching Toxicity Leaching Method - Sulfuric Nitric Acid Method" (HJT299-2007), the leaching experiment was carried out on the sta...

Embodiment 2

[0074] The concentration of the tested contaminated soil is: Cr (66.28mg / kg), Ni (57.84mg / kg), Cu (450.90mg / kg), Zn (5431.00mg / kg), As (6080.00mg / kg), Cd (37.02 mg / kg) and Pb (2936.86mg / kg).

[0075] The remediation agent for compound heavy metal polluted soil is prepared according to the following ratio:

[0076] ingredients

mass (g)

Mass percentage in heavy metal polluted soil / %

Calcium Dihydrogen Phosphate

20

2

ferrous sulfate

75

7.5

magnesium oxide

100

10

Kaolin

5

0.5

humic acid

25

2.5

powdered quartz sand

25

2.5

[0077] After the prepared remediation agent is mixed with 1kg of compound polluted soil evenly, add water until the moisture content reaches 40%, and maintain in the open air for 48 days.

[0078] According to "Solid Waste Leaching Toxicity Leaching Method - Sulfuric Nitric Acid Method" (HJT299-2007), the leaching experiment was carried out on the stabilized body...

Embodiment 3

[0082] The concentrations of the tailings for testing are: Cr (43.03mg / kg), Ni (28.67mg / kg), Cu (301.25mg / kg), Zn (3412.00mg / kg), As (2951.00mg / kg), Cd (21.91 mg / kg) and Pb (1825.71mg / kg).

[0083] The remediation agent for compound heavy metal polluted soil is prepared according to the following ratio:

[0084] ingredients

mass (g)

Mass percentage in heavy metal polluted soil / %

calcium phosphate

20

2

ferric sulfate

25

2.5

magnesium oxide

100

10

meerschaum

10

1

humic acid

25

2.5

glass powder

25

2.5

[0085] After the prepared restoration agent is mixed with 1kg of tailings containing heavy metals evenly, add water until the moisture content reaches 40%, and maintain in the open air for 48 days.

[0086] 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 co...

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PUM

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Abstract

The invention discloses a repair medicament for compound heavy metal polluted soil. The repair medicament comprises the following components: phosphate compound, soluble ferric salt, magnesium oxide, inorganic clay, an organic chelating agent and silicon dioxide, wherein the phosphate compound adopts one or the combination of phosphate, hydrophosphate or dihydric phosphate. The repair medicament is applicable to compound heavy metal polluted farmland soil, compound heavy metal polluted industrial site soil and compound heavy metal polluted mine site soil. Stirring and mixing of the repair medicament and the heavy metal polluted soil belong to in-site stirring and mixing or off-site stirring and mixing. The repair medicament is short in repair cycle and low in cost, has wide spectrum, and is simple in technical operation.

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 treating compound heavy metal polluted soil and its preparation and application. Specifically, it relates to the preparation and application method of a remediation agent for contaminated soil polluted by one or a combination of heavy metals cadmium, chromium, arsenic, lead, copper, zinc or nickel. 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 survey area is about 6.3 million square kilometers. The exceeding standard rate was 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites were 11.2%, 2.3%, 1.5%...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00
CPCC09K17/40C09K2101/00
Inventor 吕正勇冯国杰魏丽申坤李淑彩倪鑫鑫甄胜利刘泽军
Owner BEIJING GEOENVIRON ENG & TECH
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