CN105880277A - Chromium-contaminated soil remediation method - Google Patents
Chromium-contaminated soil remediation method Download PDFInfo
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- CN105880277A CN105880277A CN201610486101.3A CN201610486101A CN105880277A CN 105880277 A CN105880277 A CN 105880277A CN 201610486101 A CN201610486101 A CN 201610486101A CN 105880277 A CN105880277 A CN 105880277A
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- chromium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Mycology (AREA)
- Botany (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a chromium-contaminated soil remediation method which comprises the following steps: breaking the chromium-contaminated soil to obtain chromium-contaminated soil with less than 10cm of particle size; adding iron powder, ferrous sulfate and water into the broken chromium-contaminated soil, and stirring uniformly; isolating air and preserving moisture for 7 days for a reduction reaction, wherein the molar ratio of the iron powder, the ferrous sulfate and the hexavalent chromium in the chromium-contaminated soil is 80:(120-150):1; uniformly mixing a soil remediation agent and sodium hydroxide; and placing for 7-10 days. In the invention, the hexavalent chromium in the contaminated soil is reduced into trivalent chromium by using the iron powder and ferrous sulfate; after that, the soil remediation agent taking bagasse as a main material and the sodium hydroxide are added for further precipitating the trivalent chromium, thus the content of hexavalent chromium in the soil, the leaching concentration of total chromium and hexavalent chromium and the mobility and toxicity degree of chromium in the soil are reduced; and the bagasse is widely available, and cyclic utilization of waste is realized without causing secondary pollution.
Description
Technical field
The present invention relates to belong to environmental technology field, the restorative procedure of a kind of chromium-polluted soil.
Background technology
At present, China's heavy-metal contaminated soil area at least 20,000,000 hectares, heavy metal pollution wide material sources,
" three wastes " unreasonable discharge of the industries such as mineral processing and smelting, plating, battery, chemical industry, dyestuff, dirty
Water is irrigated, mud fertilising, and motor vehicle exhaust emission in Urban Transportation, electronic waste is dealt with improperly, all
The heavy metal pollution of soil can be caused.Heavy metal pollution of soil has pollutant poor mobility, stagnant in soil
Staying time length, the feature such as irreversible, cause soil fertility to decline, crop yield and quality decline, and
And can be by runoff and leaching polluted underground water and surface water.
Cr VI, as a kind of important industrial chemicals, is widely used in the row such as intermetallic composite coating, plating, process hides
Industry.At present in industry, processing method to hexavalent chromium wastewater is mainly hexavalent chrome reduction is low toxicity trivalent chromium,
Then with Cr (OH)3Precipitation form removes.The solid precipitation that this method produces easily forms new pollution, and not
The resource reclaim of chromium ion can be realized.
Summary of the invention
In order to overcome the deficiency existing for above-mentioned prior art, the present invention provides the reparation of a kind of chromium-polluted soil
Method.
The purpose of the present invention can be achieved through the following technical solutions:
The restorative procedure of a kind of chromium-polluted soil, it is characterised in that this preparation method comprises the steps:
(1) chromium-polluted soil is carried out break process, obtain the particle diameter chromium-polluted soil less than 10cm；
(2) chromium-polluted soil after crushing adds iron powder, ferrous sulfate and water, stirs, isolation sky
Gas, moisturizing carry out reduction reaction, iron powder, ferrous sulfate and chromic mol ratio in chromium-polluted soil for 7 days
For 80:120-150:1；
(3) step (2) chromium-polluted soil is mixed homogeneously with soil-repairing agent, sodium hydroxide, place 7-10
My god；
Described soil sealing compound is made up of the raw material of following weight portion: bagasse 50-80 part, bentonite 30-40
Part, meerschaum 20-28 part, attapulgite 15-20 part, bacillus subtilis 1-2 part, hydroxyl butyl fiber
Element 5-10 part.
In described step (3), soil sealing compound is made up of the raw material of following weight portion: bagasse 65 parts, swollen
35 parts of profit soil, meerschaum 24 parts, attapulgite 18 parts, bacillus subtilis 1.5 parts, hydroxyl butyl fiber
Element 7 parts.
In described step (3), chromium-polluted soil with the weight ratio of soil-repairing agent, sodium hydroxide is
100:1-3:0.2-1。
In described step (3), chromium-polluted soil is 100:2:0.6 with soil-repairing agent, the weight ratio of sodium hydroxide.
Described bagasse is prepared by following method: will pulverize after sugar cane crushing, excessively 80-120 mesh sieve, 80 DEG C
Under the conditions of be dried 4h, obtain bagasse.
Beneficial effects of the present invention: the present invention is first with iron powder and ferrous sulfate by Cr VI in contaminated soil also
Former one-tenth trivalent chromium, is subsequently adding the soil-repairing agent with bagasse as main material and sodium hydroxide, further
Being precipitated by trivalent chromium, in reduction soil, chromic content, total chromium and chromic leaching concentration and chromium are at soil
Animal migration in earth and the degree of murder by poisoning；Bagasse wide material sources, accomplish the cyclic utilization of waste, do not produce secondary
Pollute.
Detailed description of the invention
In order to be better understood from the present invention, further illustrate the present invention below in conjunction with embodiment, but be not
Limitation of the present invention.
Embodiment 1
1, preparation soil-repairing agent
To pulverize after sugar cane crushing, cross 80-120 mesh sieve, be dried 4h under the conditions of 80 DEG C, obtain bagasse.
Take bagasse 65kg, bentonite 35kg, meerschaum 24kg, attapulgite 18kg, bacillus subtilis
Bacterium 1.5kg, hydroxybutyl cellulose 7kg mix homogeneously, obtain soil-repairing agent.
2, take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, be crushed to soil particle diameter and exist
Within 10cm.Soil after broken is loaded blender, adds 80mol iron powder, 120mol sulfur while stirring
Acid is ferrous, and water use regulation soil moisture content is 30-40%, stirs, and completely cuts off air, moisture-keeping maintaining 7 days
Carry out reduction reaction.
3, by the chromium-polluted soil 100kg after above-mentioned maintenance and soil-repairing agent 2kg, sodium hydroxide 0.6kg
Mix homogeneously, places 7-10 days.
Embodiment 2
1, preparation soil-repairing agent
To pulverize after sugar cane crushing, cross 80-120 mesh sieve, be dried 4h under the conditions of 80 DEG C, obtain bagasse.
Take bagasse 50kg, bentonite 30kg, meerschaum 20kg, attapulgite 20kg, bacillus subtilis
Bacterium 1kg, hydroxybutyl cellulose 5kg mix homogeneously, obtain soil-repairing agent.
2, take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, be crushed to soil particle diameter and exist
Within 10cm.Soil after broken is loaded blender, adds 80mol iron powder, 120mol sulfur while stirring
Acid is ferrous, and water use regulation soil moisture content is 30-40%, stirs, and completely cuts off air, moisture-keeping maintaining 7 days
Carry out reduction reaction.
3, by the chromium-polluted soil 100kg after above-mentioned maintenance and soil-repairing agent 1kg, sodium hydroxide 0.2kg
Mix homogeneously, places 7-10 days.
Embodiment 3
1, preparation soil-repairing agent
To pulverize after sugar cane crushing, cross 80-120 mesh sieve, be dried 4h under the conditions of 80 DEG C, obtain bagasse.
Take bagasse 80kg, bentonite 40kg, meerschaum 28kg, attapulgite 15kg, bacillus subtilis
Bacterium 2kg, hydroxybutyl cellulose 10kg mix homogeneously, obtain soil-repairing agent.
2, take the chromium-polluted soil that 100kg hexavalent chromium concentration is 0.01mol/kg, be crushed to soil particle diameter and exist
Within 10cm.Soil after broken is loaded blender, adds 80mol iron powder, 120mol sulfur while stirring
Acid is ferrous, and water use regulation soil moisture content is 30-40%, stirs, and completely cuts off air, moisture-keeping maintaining 7 days
Carry out reduction reaction.
3, the chromium-polluted soil 100kg after above-mentioned maintenance is mixed with soil-repairing agent 3kg, sodium hydroxide 1kg
Uniformly, place 7-10 days.
Above content is only citing made for the present invention and explanation, affiliated those skilled in the art
Described specific embodiment is made various amendment or supplements or use similar mode to substitute, as long as
Without departing from inventing or surmounting scope defined in the claims, protection scope of the present invention all should be belonged to.
Claims (5)
1. the restorative procedure of a chromium-polluted soil, it is characterised in that this preparation method comprises the steps:
(1) chromium-polluted soil is carried out break process, obtain the particle diameter chromium-polluted soil less than 10cm；
(2) chromium-polluted soil after crushing adds iron powder, ferrous sulfate and water, stirs, isolation sky
Gas, moisturizing carry out reduction reaction, iron powder, ferrous sulfate and chromic mol ratio in chromium-polluted soil for 7 days
For 80:120-150:1；
(3) step (2) chromium-polluted soil is mixed homogeneously with soil-repairing agent, sodium hydroxide, place 7-10
My god；
Described soil sealing compound is made up of the raw material of following weight portion: bagasse 50-80 part, bentonite 30-40
Part, meerschaum 20-28 part, attapulgite 15-20 part, bacillus subtilis 1-2 part, hydroxyl butyl fiber
Element 5-10 part.
The restorative procedure of chromium-polluted soil the most according to claim 1, it is characterised in that described step
(3) in, soil sealing compound is made up of the raw material of following weight portion: bagasse 65 parts, bentonite 35 parts, sea
Afrodite 24 parts, attapulgite 18 parts, bacillus subtilis 1.5 parts, hydroxybutyl cellulose 7 parts.
The restorative procedure of chromium-polluted soil the most according to claim 1, it is characterised in that described step
(3) in, chromium-polluted soil is 100:1-3:0.2-1 with soil-repairing agent, the weight ratio of sodium hydroxide.
The restorative procedure of chromium-polluted soil the most according to claim 3, it is characterised in that described step
(3) in, chromium-polluted soil is 100:2:0.6 with soil-repairing agent, the weight ratio of sodium hydroxide.
The restorative procedure of chromium-polluted soil the most according to claim 1, it is characterised in that described Caulis Sacchari sinensis
Slag is prepared by following method: will pulverize after sugar cane crushing, crosses 80-120 mesh sieve, is dried under the conditions of 80 DEG C
4h, obtains bagasse.
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| CN201610486101.3A CN105880277A (en) | 2016-06-27 | 2016-06-27 | Chromium-contaminated soil remediation method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269839A (en) * | 2016-08-30 | 2017-01-04 | 樊之雄 | A kind of restorative procedure of chromium ion contaminated soil |
| CN106269844A (en) * | 2016-11-04 | 2017-01-04 | 金福兴 | A kind of restorative procedure of mercury ion contaminated soil |
| JP2018103133A (en) * | 2016-12-27 | 2018-07-05 | 日鉄住金セメント株式会社 | Soil treatment material and purification method of heavy metal contaminated soil |
| CN108276228A (en) * | 2018-01-16 | 2018-07-13 | 航天凯天环保科技股份有限公司 | One kind being used for the fertilizer and preparation method thereof of Cr (VI) contaminated soil remediations and improvement |
| CN108405602A (en) * | 2018-05-28 | 2018-08-17 | 北京高能时代环境技术股份有限公司 | A kind of medicament composition and method for repairing chromium-polluted soil |
| CN110305669A (en) * | 2018-03-20 | 2019-10-08 | 西南科技大学 | A kind of high pollution of chromium site remediation material |
| CN112916607A (en) * | 2021-01-26 | 2021-06-08 | 广东中科碧城环境技术有限公司 | Stabilization restoration method for heavy metal contaminated soil |
| CN112958606A (en) * | 2021-02-03 | 2021-06-15 | 中环国投(重庆)环保产业开发有限公司 | Remediation method for organic contaminated soil |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269839A (en) * | 2016-08-30 | 2017-01-04 | 樊之雄 | A kind of restorative procedure of chromium ion contaminated soil |
| CN106269844A (en) * | 2016-11-04 | 2017-01-04 | 金福兴 | A kind of restorative procedure of mercury ion contaminated soil |
| JP2018103133A (en) * | 2016-12-27 | 2018-07-05 | 日鉄住金セメント株式会社 | Soil treatment material and purification method of heavy metal contaminated soil |
| CN108276228A (en) * | 2018-01-16 | 2018-07-13 | 航天凯天环保科技股份有限公司 | One kind being used for the fertilizer and preparation method thereof of Cr (VI) contaminated soil remediations and improvement |
| CN110305669A (en) * | 2018-03-20 | 2019-10-08 | 西南科技大学 | A kind of high pollution of chromium site remediation material |
| CN110305669B (en) * | 2018-03-20 | 2022-04-01 | 西南科技大学 | High-chromium polluted site repairing material |
| CN108405602A (en) * | 2018-05-28 | 2018-08-17 | 北京高能时代环境技术股份有限公司 | A kind of medicament composition and method for repairing chromium-polluted soil |
| CN112916607A (en) * | 2021-01-26 | 2021-06-08 | 广东中科碧城环境技术有限公司 | Stabilization restoration method for heavy metal contaminated soil |
| CN112958606A (en) * | 2021-02-03 | 2021-06-15 | 中环国投(重庆)环保产业开发有限公司 | Remediation method for organic contaminated soil |
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