CN104056856A - In-situ remediation method of arsenic soil pollution - Google Patents
In-situ remediation method of arsenic soil pollution Download PDFInfo
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- CN104056856A CN104056856A CN201310086323.2A CN201310086323A CN104056856A CN 104056856 A CN104056856 A CN 104056856A CN 201310086323 A CN201310086323 A CN 201310086323A CN 104056856 A CN104056856 A CN 104056856A
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- soil
- arsenic
- polluted
- situ remediation
- remediation method
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Links
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 60
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005067 remediation Methods 0.000 title claims abstract description 16
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 13
- 238000003900 soil pollution Methods 0.000 title claims abstract description 13
- 239000002689 soil Substances 0.000 claims abstract description 73
- 239000007790 solid phase Substances 0.000 claims abstract description 16
- 239000007791 liquid phase Substances 0.000 claims abstract description 14
- 239000002609 medium Substances 0.000 claims description 14
- 235000015097 nutrients Nutrition 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 11
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 239000001963 growth medium Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 239000011780 sodium chloride Substances 0.000 claims description 5
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 4
- 239000003337 fertilizer Substances 0.000 claims description 4
- 239000008103 glucose Substances 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- JVTAAEKCZFNVCJ-UHFFFAOYSA-M Lactate Chemical compound CC(O)C([O-])=O JVTAAEKCZFNVCJ-UHFFFAOYSA-M 0.000 claims description 2
- 235000006753 Platycodon grandiflorum Nutrition 0.000 claims description 2
- 240000003582 Platycodon grandiflorus Species 0.000 claims description 2
- 238000012271 agricultural production Methods 0.000 claims description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 210000003608 fece Anatomy 0.000 claims description 2
- 238000009776 industrial production Methods 0.000 claims description 2
- 244000144972 livestock Species 0.000 claims description 2
- 239000010871 livestock manure Substances 0.000 claims description 2
- 239000010815 organic waste Substances 0.000 claims description 2
- 244000144977 poultry Species 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 3
- 238000007796 conventional method Methods 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000004936 stimulating effect Effects 0.000 abstract description 2
- 238000005842 biochemical reaction Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 230000000813 microbial effect Effects 0.000 abstract 1
- 230000005012 migration Effects 0.000 description 8
- 238000013508 migration Methods 0.000 description 8
- 239000000284 extract Substances 0.000 description 5
- 244000005700 microbiome Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- NGSFWBMYFKHRBD-UHFFFAOYSA-M sodium lactate Chemical compound [Na+].CC(O)C([O-])=O NGSFWBMYFKHRBD-UHFFFAOYSA-M 0.000 description 2
- 239000001540 sodium lactate Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000021393 food security Nutrition 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the field of remediation methods of soil heavy metal pollution, and particularly relates to an in-situ remediation method of arsenic soil pollution. The method comprises the following steps: adding a liquid medium into arsenic-polluted soil to be treated to allow the arsenic-polluted soil to be treated to be in reduction environment, stimulating the soil microbial growth, distributing arsenic from the soil solid phase to the soil liquid phase, then transferring the arsenic to a layer below a plough layer, fixing the arsenic in deep soil to realize remediation of the arsenic-polluted soil. According to the method of the invention, arsenic is distributed from the soil solid phase to the soil liquid phase through a series of biochemical reactions, and then is transferred to a layer below the plough layer and fixed in deep soil, so as to realize remediation of arsenic-polluted soil. The method is simple in operation and low in cost, and when compared with conventional methods, the method is safer and more reliable.
Description
Technical field
The invention belongs to heavy metal pollution of soil and repair field, specifically a kind of in-situ remediation method of arsenic soil pollution.
Background technology
Arsenic (As) is the toxic heavy metal element that occurring in nature extensively exists, and it is a global environmental problem that the arsenic causing due to nature and artificial origin pollutes.Soil has stronger fixing ability to arsenic, is easy to form arsenic and pollutes and enrichment, according to investigations, the many cities of China and industrial and mining area soil are all subject to arsenic in various degree and pollute, the threat that ecological environment, food security and human health have been caused seriously.Arsenic in soil mainly with As(III), As(V) form exist, As(V) be mainly present in oxidative soil; And As(III) be present in reproducibility soil and compared with As(V more) there is stronger animal migration.The reparation of As polluted soil at present mainly contains engineering measure, physical chemistry reparation, phytoremediation etc.These methods respectively have pluses and minuses, and its situ microorganism is repaired a kind of restorative procedure that is considered to have potentiality.In soil environment, there are various microorganisms, by the activity of creating favourable condition, stimulating these microorganisms, can change occurrence patterns and the animal migration of arsenic in soil, make As polluted soil repaired.In-situ remediation method in the past focuses mostly in considering to reduce arsenic animal migration, and arsenic is fixed on to solid phase of soil.Time easily again discharged but the arsenic being fixed often fluctuation occurs at environmental oxidation reducing condition, can be caused potential (long-term) pollution and threat to crops and underground water.
Summary of the invention
The object of the invention is to provide a kind of in-situ remediation method of arsenic soil pollution.
For achieving the above object, the technical solution used in the present invention is:
A kind of in-situ remediation method of arsenic soil pollution, in pending As polluted soil, add fluid nutrient medium, pending arsenic is polluted in reducing environment, stimulate edaphon growth, arsenic is dispensed to liquid phase of soil from solid phase of soil, and it is following and be fixed in deep soil to migrate to subsequently arable layer, thereby realize the reparation of As polluted soil.
With 0.2-0.5cmh
-1flow velocity to drenching and add fluid nutrient medium in pending As polluted soil, pending arsenic is polluted in reducing environment, stimulate edaphon growth, arsenic is dispensed to liquid phase of soil from solid phase of soil, and it is following and be fixed in deep soil to migrate to subsequently arable layer, thereby realize the reparation of As polluted soil.
By mass percentage, the organic matter of 2-10%, the yeast of 0.01-1% soak the inorganic salts of powder, 0.2-10% to described fluid nutrient medium, and surplus is water, and pH value is 6-8.
Described organic matter can be one or more the mixing in the organic waste materials in glucose, lactate, fertilizer, manure of livestock and poultry fertilizer, crops balloonflower root, agricultural byproducts, industrial and agricultural production process.
Inorganic salts are the KH of 1-3mM
2pO
4, the NH of 2-6mM
4cl, 5-10mM KCl, the CaCl of 0.5-2mM
2, the NaCl of 10-30mM, the MgCl of 2-5mM
2na with 5-15mM
2sO
4 2-.
By fluid nutrient medium with 0.2-0.5cmh
-1flow velocity put on continuously in pending As polluted soil, flood soil and make soil moisture saturated, its oxygen content is diminished very gradually to trending towards 0, and then arsenic is moved to deep subsoil in culture medium.
The present invention has advantages of: the present invention is by creating reducing condition and adding wherein nutrient source and the activity of inorganic salt and other material stimulation indigenous microorganism for As polluted soil, thereby change the form of Arsenic in Soil and associated minerals, the animal migration that improves arsenic migrates to arsenic deep soil and is fixed from plough horizon.Because deep soil is subject to disturbance less, be fixed in arsenic herein more stable, be difficult for causing secondary pollution.The present invention invents simple to operate, with low cost and compared with conventional method, more safe and reliable.
Brief description of the drawings
Top layer (0-20cm place) and deep layer (20-40cm place) liquid phase arsenic concentration temporal evolution curve map under the experiment condition that Fig. 1 provides for the embodiment of the present invention.
After the reparation that Fig. 2 provides for the embodiment of the present invention, solid phase arsenic respectively extracts state content with depth of soil scatter chart.
Specific implementation method
Below by embodiment, the present invention is described in further detail, following instance is just illustrative rather than definitive thereof the present invention.
Embodiment 1
Under laboratory condition, add the migration situation to top layer arsenic in soil by post experimental simulation culture medium:
Layering gathers Shenyang and opens scholar 0-20,20-40cm arable soil, and wherein arsenic background value is about 10mgKg
-1.By manually adding Na to top layer 0-20cm
3asO
47H
2o obtains containing the about 45mgKg of arsenic
-1arsenic pollute topsoil (hereinafter referred to as original soil 0-20).
In fluid nutrient medium, each content of material is: 2mLL
-1sodium lactate, KH
2pO
4(1.0mM), NH
4cl(4.7mM), KCl(6.7mM), CaCl
22H
2o(0.9mM), NaCl(17mM), MgCl
26H
2o(3.0mM), Na
2sO
4(10mM), add in addition yeast and soak powder (0.5gL
-1) (purchased from Beijing extensive and profound in meaning star biotechnology Co., Ltd).Wherein each material water preparation gained.Simultaneously also with water (electrical conductivity ≈ 6.91 μ Scm
-1) as a control group soil is carried out to leaching.
With 0.342cmh
-1flow velocity inject above-mentioned culture medium to topsoil, form and the concentration (referring to Fig. 1) of As in continuous detecting topsoil (0-20cm place) and deep soil (20-40cm place) efflux.
After operation a period of time (96 days), analyze form and the content (referring to Fig. 2) of topsoil and deep soil solid phase As.
Top layer (20cm place) and deep layer (40cm place) liquid phase arsenic concentration can be found out as shown in Figure 1:
(1), experimental group (medium treatment) topsoil liquid phase arsenic concentration is far away higher than control group (water), this shows that culture medium has promoted top layer solid phase As to discharge to liquid phase;
(2), deep soil liquid phase arsenic concentration is much lower compared with topsoil, this shows that arsenic is fixed on fast in deep soil solid phase, without outflow from topsoil migrates to deep soil;
(3), experimental group liquid phase As(III) (33.8%) ratio is far away higher than control group (8.7%), shows that culture medium has promoted the reduction of As.
Can be found out with the distribution of depth of soil by Fig. 2 solid phase arsenic content:
(1), control group topsoil (0-20cm) arsenic content and original soil be more or less the same, and shows that water is not obvious to the migration of top layer solid phase arsenic; And in experimental group solid phase topsoil arsenic content reduced over half, with Fig. 1 liquid phase data coincide, shown arsenic migration to deep soil by topsoil under culture medium effect.
(2), solid phase arsenic being carried out to chemistry extracts and finds continuously: 0-20cm soil place, the nearly half ADSORPTION STATE of control group As(As
pO4) be converted into more stable HCl and can extract state As(As
hCl); And medium treatment group ADSORPTION STATE As(As
pO4) content is reduced to 1/3 left and right of original soil, HCl can extract state As(As
hCl) also decrease.Show that the arsenic that culture medium can " activate " topsoil makes it more easily to distribute and migration to liquid phase.
(3) solid phase 20-40cm chemistry extracts continuously result and shows, no matter control group or experimental group As
hClcontent all rises to some extent, and this is the reason that arsenic is fixed at deep soil.
In a word, medium treatment makes arsenic obtain " activation " at topsoil and moves to deep soil, and the consumption because of nutriment at deep soil makes arsenic be retightened at deep soil place, thereby the soil pollution of arsenic is repaired.
Embodiment 2
Difference from Example 1 is, in fluid nutrient medium, each content of material is: 10mM glucose, 1mLL
-1sodium lactate, KH
2pO
4(2.0mM), NH
4cl(5.0mM), KCl(7.0mM), CaCl
22H
2o(1.0mM), NaCl(20mM), MgCl
26H
2and Na O(3.0mM)
2sO
4(15mM); Add in addition yeast and soak powder (0.6gL
-1).Wherein each material water preparation gained.And with 0.2cmh
-1flow velocity inject above-mentioned culture medium to topsoil.
Embodiment 3
Difference from Example 1 is,
In fluid nutrient medium, each content of material is: glucose (10mM), KH
2pO
4(3.0mM), NH
4cl(6.0mM), KCl(10.0mM), CaCl
22H
2o(2.0mM), NaCl(30mM), MgCl
26H
2and Na O(5.0mM)
2sO
4(10mM), add in addition yeast and soak powder (1.0gL
-1).Wherein each material water preparation gained.And with 0.5cmh
-1flow velocity inject above-mentioned culture medium to topsoil,
The present invention can also use other various embodiments, under the premise without departing from the principles of the invention, can also carry out suitable retouching and improvement to the present invention, and these retouchings and improvement also should be considered as protection scope of the present invention.
Claims (6)
1. the in-situ remediation method of an arsenic soil pollution, it is characterized in that: in pending As polluted soil, add fluid nutrient medium, make pending As polluted soil in reducing environment, stimulate edaphon growth, arsenic is dispensed to liquid phase of soil from solid phase of soil, and it is following and be fixed in deep soil to migrate to subsequently arable layer, thereby realize the reparation of As polluted soil.
2. by the in-situ remediation method of arsenic soil pollution claimed in claim 1, it is characterized in that: with 0.2-0.5cmh
-1flow velocity to drenching and add fluid nutrient medium in pending As polluted soil, pending arsenic is polluted in reducing environment, stimulate edaphon growth, arsenic is dispensed to liquid phase of soil from solid phase of soil, and it is following and be fixed in deep soil to migrate to subsequently arable layer, thereby realize the reparation of As polluted soil.
3. by the in-situ remediation method of the arsenic soil pollution described in claim 1 or 2, it is characterized in that: by mass percentage, the organic matter of 2-10%, the yeast of 0.01-1% soak the inorganic salts of powder, 0.2-10% to described fluid nutrient medium, and surplus is water, and pH value is 6-8.
4. by the in-situ remediation method of arsenic soil pollution claimed in claim 3, it is characterized in that: described organic matter can be one or more the mixing in the organic waste materials in glucose, lactate, fertilizer, manure of livestock and poultry fertilizer, crops balloonflower root, agricultural byproducts, industrial and agricultural production process.
5. by the in-situ remediation method of arsenic soil pollution claimed in claim 3, it is characterized in that: the KH that inorganic salts are 1-3mM
2pO
4, the NH of 2-6mM
4cl, 5-10mM KCl, the CaCl of 0.5-2mM
2, the NaCl of 10-30mM, the MgCl of 2-5mM
2na with 5-15mM
2sO
4 2-.
6. by the in-situ remediation method of arsenic soil pollution claimed in claim 3, it is characterized in that: by fluid nutrient medium with 0.2-0.5cmh
-1flow velocity put on continuously in pending As polluted soil, flood soil and make soil moisture saturated, make arsenic culture medium flow under move to deep subsoil.
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|---|---|---|---|
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|---|---|---|---|
| CN201310086323.2A CN104056856B (en) | 2013-03-18 | 2013-03-18 | A kind of in-situ remediation method of arsenic soil pollution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104056856A true CN104056856A (en) | 2014-09-24 |
| CN104056856B CN104056856B (en) | 2015-12-02 |
Family
ID=51544952
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105312317A (en) * | 2015-05-08 | 2016-02-10 | 北京师范大学 | Method for repairing acid soil polluted by petroleum hydrocarbon and heavy metal with reinforced saccharomycetes |
| CN105414164A (en) * | 2015-12-28 | 2016-03-23 | 钦州学院 | Repair method of arsenic-polluted soil |
| CN105945054A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Zn in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN107159707A (en) * | 2017-05-03 | 2017-09-15 | 浙江大学 | One kind promotes the biodegradable methods of plasticiser DEHP in soil using wheat bran and LB culture mediums |
| CN108114975A (en) * | 2017-12-07 | 2018-06-05 | 中国科学院地球化学研究所 | The method that micro- aerobic iron-oxidizing bacteria group administers As polluted soil |
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| CN105945054A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Zn in-situ and ex-situ coupling detoxification method based on biogas residues |
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| CN108114975A (en) * | 2017-12-07 | 2018-06-05 | 中国科学院地球化学研究所 | The method that micro- aerobic iron-oxidizing bacteria group administers As polluted soil |
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|---|---|
| CN104056856B (en) | 2015-12-02 |
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