CN108723080A - In-situ remediation method of heavy-metal contaminated soil and application thereof - Google Patents
In-situ remediation method of heavy-metal contaminated soil and application thereof Download PDFInfo
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- CN108723080A CN108723080A CN201810596640.1A CN201810596640A CN108723080A CN 108723080 A CN108723080 A CN 108723080A CN 201810596640 A CN201810596640 A CN 201810596640A CN 108723080 A CN108723080 A CN 108723080A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The present invention provides a kind of in-situ remediation methods of heavy-metal contaminated soil and application thereof, are related to contaminated soil Prevention Technique field.Then the in-situ remediation method is laid with planting soil layer, and vegetation is planted in planting soil layer, to achieve the purpose that the soil to heavy metal pollution is repaired by setting up defences infiltration layer on the contaminated soil upper berth Jing Guo curing process on impervious barrier.This method has safe and clean, environmental benefit height and ecological benefits clear advantage, and above-mentioned in-situ remediation method, which is applied to industrial pollution site remediation, has advantage at low cost, easy for construction.
Description
Technical field
The present invention relates to contaminated soil Prevention Technique fields, more particularly, to a kind of in-situ immobilization of heavy-metal contaminated soil
Method and application thereof.
Background technology
Soil is the important component of environment for the survival of mankind, and the pollutant in soil can be entered by soil sticking
Inside soil, especially heavy metal contaminants cannot be degraded, and can be concentrated in the soil.Soil pollution and water pollution and air are dirty
Dye, which is compared, has the characteristics that the pollution time is long, irreversible and difficult to degrade.The source of soil pollution generally comprises sewage irrigation, solid
The pollution of waste and pesticide and fertilizer.Very serious situation is presented in some pollution of soil of China at present, to ecology
The development of environment, food security and agricultural constitutes serious threat, is eaten by heavy metal pollution, often per year over 12000000 ton-grain
Year because pollution and caused by economic loss be up to 20,000,000,000 yuan.
Heavy metal pollution is main pollution source in soil.Especially heavy metal contaminants can enter along food chain
In human body, there is very big toxicity to each internal organs function of human body.Heavy metal can cause to suffer from hypertension, or even cause heart and brain blood
Pipe disease.Bone and liver kidney can also be destroyed, or even causes renal failure.
Heavy metal cadmium can by biological magnification or biological accumulation, into human body after to lung, brain, and
Blood circulation system generates damage.Lead is also the larger one kind of heavy metal element Poisoning, is difficult discharge if into human body.
The brain cell of human body, the especially nervous system of fetus can directly be injured, it is possible to congenital feeblemindedness is caused, to the elderly
Senile dementia can then be caused.
Mercury is a kind of element larger to environmental hazard, human body is nonessential, the large-scale mankind's activity since industrialization
A large amount of mercury are resulted in be drained into environment.It is nationwide with the continuous improvement of economic rapid growth and urbanization in China
Interior mercury contaminated soil problem very severe.Mercury with the biological accumulation feature of its toxicity, seriously threaten the mankind life and health and
Ecological environment.Mercury easily with containing sulfydryl protein and enzyme combined, lead to tens of kinds of enzymes inactivation or film dysfunction in vivo, to
Cellular damage is caused, is the basis of Hg toxicity effect.Mercury also has mutagenesis, can cause chromosome aberration.Low dosage
Mercury can also influence nervous system, renal system, immune system, cardiovascular system and the muscle activity of people.Any type weight
The exceeded of metallic element all may generate extremely serious destruction to the mankind or even the entire ecosystem.
Heavy-metal contaminated soil to crop and agricultural product quality there are huge threat, the reparation to heavy metal pollution of soil
Research has become the hot spot in current environment scientific and engineering field.Physics that tradition uses, chemical remediation technology such as soil moved in improve the original, leaching
Wash, the repairing polluted soils such as pyrolysis processing when have some limitations, for example be not suitable for repairing pollution in wide area soil etc.,
In addition these methods may influence the activity of geobiont, or even change soil texture, lose so as to cause soil biology function
It loses.Therefore a kind of method of effective prevention heavy metal in soil pollution needs at present.
In view of this, special propose the present invention.
Invention content
The first object of the present invention is to provide a kind of in-situ remediation method of heavy-metal contaminated soil, can repair big face
The soil of product heavy metal pollution, the secondary pollution problem that contaminated soil heterotopic disposition can be effectively prevent to generate have safe, clear
It is clean, environmental benefit height and ecological benefits clear advantage, and this method is at low cost, and it is easy for construction.
The second object of the present invention is to provide a kind of use of above-mentioned in-situ remediation method in industrial pollution site remediation
On the way, above-mentioned in-situ remediation method is applied to industrial pollution site remediation has easy for construction, short construction period, at low cost, ring
The advantages of border high efficiency.
In order to solve the above technical problems, spy of the present invention adopts the following technical scheme that：
A kind of in-situ remediation method of heavy-metal contaminated soil, the in-situ remediation method include the following steps：Passing through
The contaminated soil upper berth of curing process is set up defences infiltration layer, planting soil layer is then laid on impervious barrier, and planted in planting soil layer
Vegetation.
Preferably, the curing process is included in soil surface using curing agent；It is preferred that application is solid in such a way that paving is spilt
Agent.
Preferably, the thickness of the impervious barrier is 20-45cm；The impervious barrier is mainly made of clay.
Preferably, the thickness of the planting soil layer is 30-50cm.
Preferably, the vegetation is shrub plant and herbaceous plant.
Preferably, the plantation spacing of the shrub plant is 50-150cm.
Preferably, the shrub plant includes serissa serissoide and/or Rubus corchorifolius, and the herbaceous plant includes ciliate desert-grass and dog tail
Grass.
Preferably, the grass-seed of the grass-seed of the ciliate desert-grass and the green bristlegrass is according to (1-5)：The weight ratio of (5-1) carries out
Breeding；According to 20-40g/m2Thickness of sowing sowed.
Preferably, the soil of the heavy metal pollution is the soil of mercury pollution.
The present invention also provides a kind of purposes of above-mentioned in-situ remediation method in industrial pollution site remediation.
Compared with prior art, the present invention has the advantages that：
The in-situ remediation method of heavy-metal contaminated soil provided by the invention passes through in the contaminated soil Jing Guo curing process
Upper berth is set up defences infiltration layer, planting soil layer is then laid on impervious barrier, and vegetation is planted in planting soil layer, to reach to heavy metal
The purpose that contaminated soil is repaired.Curing process can fix the heavy metal element in soil in the soil, reduce it
Migration in the environment and bioavailability, to reduce the environmental risk of heavy metal pollution；It, can by being laid with impervious barrier
Contaminated soil and untainted soil or water body to be separated, secondary pollution caused by reduce or organize pollutant to spread.?
It is laid with planting soil layer by cured and Anti-seeping technology contaminated soil surface and plants vegetation, lower soil water and soil can be prevented
It is lost in, reduces the possibility of contaminated soil migration.
Contaminated soil is first carried out curing process by this method, contaminated soil heterotopic disposition can be effectively prevent to generate secondary
Pollution problem, safety are bought clearly, and environmental benefit, ecological benefits are apparent；The curing soil that the in-situ remediation method uses and plantation
It is extensive, cheap the material sources such as to prepare, can buy nearby, effectively shorten construction period；The in-situ remediation method is applicable in model
It encloses extensively, various heavy contaminated soil can be repaired, can also be planted according to place size and the adjustment of contaminated soil treatment scale
The planting density of strain, therefore this method is applied widely, and rehabilitation cost is low, short construction period, and engineering applicability is strong.The present invention
The in-situ remediation method of the contaminated soil of offer not only performs in-situ solidifying and the restoration of the ecosystem of contaminated soil, and construction party
Just, short construction period, at low cost, environmental benefit is higher, have preferable application prospect.
Purposes of the above-mentioned in-situ remediation method provided by the invention in industrial pollution site remediation, have it is easy for construction,
Short construction period, advantage at low cost, environmental benefit is high.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the reparation flow chart for the in-situ remediation method that the present invention implements 1 heavy-metal contaminated soil provided；
Fig. 2 is that the present invention implements 1 soil texture schematic diagram provided；
Fig. 3 is that the present invention implements 1 shrub provided plantation schematic diagram；
Fig. 4 is that the present invention implements 1 vegetation provided plantation schematic diagram.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with drawings and examples, it is clear that retouched
The embodiment stated is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field
The every other embodiment that those of ordinary skill is obtained without making creative work, belongs to protection of the present invention
Range.The person that is not specified actual conditions in embodiment, carries out according to conventional conditions or manufacturer's recommended conditions.Agents useful for same or
Production firm person is not specified in instrument, is the conventional products that can be obtained by commercially available purchase.
The present invention provides a kind of in-situ remediation methods of heavy-metal contaminated soil, include the following steps：By curing
The contaminated soil upper berth of processing is set up defences infiltration layer, planting soil layer is then laid on impervious barrier, and vegetation is planted in planting soil layer.
Described heavy metal is primarily referred to as the significant heavy element of the bio-toxicities such as mercury, cadmium, lead, chromium in terms of environmental pollution.
Heavy metal cannot be biodegradable, on the contrary but can be under the biological magnification of food chain, and thousands of hundred times of ground enrichments finally enter
Human body.Heavy metal in human body can and the strong interaction of the generations such as protein and enzyme, so that them is lost activity, it is also possible to
It is accumulated in certain organs of human body, causes slow poisoning.Described heavy metal can also can including some in terms of environmental pollution
Lead to the metalloid of environmental pollution, such as metalloid arsenic, metal is in the periodic table of elements to the position of nonmetallic transition, object
Rationality matter and chemical property between metal and it is nonmetallic between.
Curing process can fix the heavy metal in soil in the soil, reduce its migration and biology in the environment
Utilizability, to reduce the environmental risk of heavy metal pollution；By be laid with impervious barrier, can by contaminated soil with it is untainted
Soil or water body separate, secondary pollution caused by reducing or pollutant being prevented to spread.In the dirt by cured and Anti-seeping technology
It contaminates soil surface and is laid with planting soil layer and planting plants, lower soil soil erosion can be prevented, reduce contaminated soil migration
It may.
Contaminated soil is first carried out curing process by this method, contaminated soil heterotopic disposition can be effectively prevent to generate secondary
Pollution problem, safety are bought clearly, and environmental benefit, ecological benefits are apparent；The curing soil that the in-situ remediation method uses and plantation
It is extensive, cheap the material sources such as to prepare, can buy nearby, effectively shorten construction period；The in-situ remediation method is applicable in model
It encloses extensively, various heavy contaminated soil can be repaired, can also be planted according to place size and the adjustment of contaminated soil treatment scale
The planting density of strain, therefore this method is applied widely, and rehabilitation cost is low, short construction period, and engineering applicability is strong.Therefore originally
The in-situ remediation method for inventing the contaminated soil provided not only performs in-situ solidifying and the restoration of the ecosystem of contaminated soil, and applies
Work is convenient, and short construction period, at low cost, environmental benefit is higher, has preferable application prospect.
In some preferred embodiments, the in-situ remediation method of heavy-metal contaminated soil carries out in accordance with the following steps：
Step 1: levelling of the land：Every preparation is carried out, if removed all grounds, underground obstacle in place, is excluded
Excess surface water, making temporary road etc..
Step 2: in-situ solidifying：Solidification is determined according to the pollution level of soil, the total content of pollutant, reparation target etc.
The adding proportion of agent, the in-situ solidifying that heavy-metal contaminated soil is preferably carried out with stir in situ equipment are handled.
In some alternative embodiments, the curing process is included in soil surface using curing agent；It is preferred that using
It spreads the mode spilt and applies curing agent.Curing agent can general by absorption to heavy metal, precipitation (co-precipitation) and the effects that be complexed
Heavy metal element is fixed in the soil, has the advantages that input is low, easy to operate, environmental-friendly.In some optional embodiment party
In formula, the curing agent includes lime, coal dust ash, apatite, hydroxyapatite, calcium dihydrogen phosphate, zeolite, bentonite, Hai Pao
Stone, biological sludge, farm manure or charcoal；It can be according to the cured soil erosion adjustment solidification of degree and needs of soil pollution
The type of agent, to achieve the purpose that optimize repairing effect.
Step 3: impervious barrier is laid with：According to《General industrial solid waste storage, disposal site contamination control standard》
(GB18599-2001), impervious barrier can cover the clay of 20-45cm thickness.Optionally, the thickness of the impervious barrier for example can be but
It is not limited to 20cm, 25cm, 30cm, 35cm, 40cm or 45cm.Antiseepage soil layer is too thin cannot to play the role of good antiseepage, prevent
It is blocked up to ooze soil layer, rehabilitation cost can be increased, is found through experiments that the impervious barrier of 20-45cm can play the role of good antiseepage.
Step 4: plantation layer is laid with：Planting soil is backfilled to the work surface surface layer after Anti-seeping technology, so that soil is reached greening and plants
Soil effective soil layer thickness is planted, effective soil layer thickness can be set as 30-50cm, and planting soil physical and chemical index meets《Planting technique soil》
(CJ/T340-2016) requirement.Optionally, the thickness of planting soil layer for example can be but be not limited to 30cm, 35cm, 40cm,
45cm or 50cm.Planting soil layer can be adjusted according to the vegetation type of plantation, and clean free of contamination plantation may be selected in planting soil layer
With soil, it can also be properly added fertilizer, but excessive pesticide should not be sprayed and cause secondary pollution.
Step 5: shrub plant is planted：It is set as according to the hat width demand of shrub, preferably shrub plantation spacing when shrub is planted
(50-150) cm × (50-150) cm, for example, can be but be not limited to 50cm, 60cm, 70cm, 80cm, 90cm, 100cm,
110cm, 120cm, 130cm, 140cm or 150cm, plantation spacing appropriate can improve the survival rate of shrub.
Shrub, which refers to those, does not have apparent trunk, in the short and small trees of epidemic situation comparison of growing thickly, and generally can be divided into sight flower, sees
Fruit sees that several classes such as limb are short and small and the xylophyta that grows thickly, and can be planted in present embodiment for example can be but be not limited to
It is one or more in rose, dragon-boat flower, azalea, Rubus corchorifolius, tree peony, gardenia, Hypericum Chinense, serissa serissoide or nandina.One
Serissa serissoide and Rubus corchorifolius are preferably planted in a little preferred embodiments.
Serissa serissoide (Serissa japonica (Thunb.) Thunb.), Rubiaceae evergreen dwarf shrub is high up to 90 centimetres,
There is foul smell.Leaf keratin, handle are short.Hua Dansheng or several grows thickly in sprig top or axillary, corolla pale red or white, and style length is prominent
Go out, the month at florescence 5-7.
Rubus corchorifolius (Rubus corchorifolius L.f.) also known as raspberry, mountain throw son, raspberry, upright shrub, high 1-3
Rice；Branch tool prickle is pubescence when young.Dan Ye, it is oval to ovum shape lanceolar, it is more it is raw endroit, mountain valley, wasteland, small stream side and
In density shrubbery at humidity.
Step 6: woody plant is planted：It is preferred that plantation green bristlegrass and ciliate desert-grass, by green bristlegrass grass-seed and centipede grass-seed according to
(1-5)：The weight ratio of (5-1) is bred, 20-40g/m2Thickness of sowing broadcasted sowing.Optionally, the grass-seed of ciliate desert-grass and
The grass-seed of green bristlegrass is according to (1-5)：The weight ratio of (5-1) is bred, such as can is but be not limited to 1:5,1:4,1:3,
1:2,1:1,1:2,1:3,1:4 or 1:5；It is preferred that according to (1-2)：The weight ratio of (2-1) is bred；According to 20-40g/m2's
Thickness of sowing sow grass-seed and the grass-seed of green bristlegrass of mixed ciliate desert-grass, and thickness of sowing for example can be but be not limited to
For 20g/m2、25g/m2、30g/m2、35g/m2Or 40g/m2, preferably according to 25-35g/m2Thickness of sowing sowed.
Herbaceous plant is usually referred to as " grass " by people, and herbaceous plant can be used as ornamental plant, and high financial profit, growth is fast,
Biological yield high-adaptability is wide, and resistance is strong, and can plant in some embodiments for example can be but be not limited to Wu
One or more of centipede grass, green bristlegrass, rye grass, Chinese holly, paradise grass or red fescue.It is preferred that plantation ciliate desert-grass and dog tail
Grass.
Ciliate desert-grass (Eremochloa ciliaris (Linn.) Merr.) is grass family Eremochloa perennial plant.Stalk
Thicket is given birth to, and very thin upright, leaf sheath flattens, and mutually across life, sheath mouth has cilium, often is given birth to and is grown nonparasitically upon another plant in the crack of stone neutralization of small stream side hayashishita
On trunk.Green bristlegrass (etaria viridis (L.) Beauv.), it is annual, it is born in wilderness, by road, is that dry crop is common
A kind of weeds.It is preferred that plantation ciliate desert-grass and green bristlegrass have of low cost, the high advantage of plant survival rate.
Serissa serissoide, Rubus corchorifolius, ciliate desert-grass and green bristlegrass all have good resistance, can also be good in contaminated soil
Growth therefore, June is preferably planted in the in-situ remediation method of the soil of mercury pollution especially in the soil of mercury pollution
Snow, Rubus corchorifolius, ciliate desert-grass and green bristlegrass.
Shrub plant and herbaceous plant are planted, there is growth soon, the advantage of good stress resistance and beauty.Adjust shrub
Plantation spacing, the heavy amount of vegetation can optimize the growth conditions of plant, and herbaceous plant is excessively unfavorable for shrub and grows, and shrub
Plantation is excessive overstocked, is unfavorable for shrub growth, and above-mentioned planting conditions can be such that plant well grows by experiment and screening.
In some preferred embodiments, quarterly carry out plant final-period management work, quarterly check liquid manure situation,
Survival condition, upgrowth situation etc..Survival rate 85% or more, is answered if any large area vegetation death to be ensured for the plant of plantation
It reseeds in time.The upgrowth situation of plant is recorded in time, such as occurred, undergrowth, plant are short and small or biomass is relatively low
Phenomenon, should suit the medicine to the illness analysis, solve in time, ensure the green percentage for repairing place.
The present invention also provides purposes of the above-mentioned in-situ remediation method in industrial pollution site remediation.Above-mentioned original position is repaiied
Compound method, which is applied to industrial pollution site remediation, has easy for construction, short construction period, advantage at low cost, environmental benefit is high.
The advantageous effect further illustrated the present invention with reference to preferred embodiment.
Embodiment 1
A kind of in-situ remediation method of mercury contaminated soil is present embodiments provided, land restoration area is 10m × 10m, is repaiied
Resurgent journey is as shown in Figure 1, include the following steps：
1) levelling of the land：Every preparation is carried out, if removed all grounds, underground obstacle in place, excludes ground
Ponding, making temporary road etc..
2) in-situ solidifying：On the surface of mercury contaminated soil, paving spills coal dust ash curing soil, then on the surface of curing soil
The clay of 30-35cm thickness is laid with as impervious barrier.
3) it is laid with planting soil layer, planting soil is backfilled to the work surface surface layer after Anti-seeping technology, planting soil layer thickness is 40-
45cm, and planting soil physical and chemical index meets《Planting technique soil》(CJ/T340-2016) requirement.Soil texture schematic diagram
As shown in Fig. 2, wherein 100 be cured contaminated soil, 200 be impervious barrier, and 300 be plantation figure layer.
4) vegetation is planted：Shrub and vegetation class plant are planted, shrub plants serissa serissoide, and plantation spacing is 1m × 1m；Vegetation
Green bristlegrass and ciliate desert-grass are planted, the grass-seed of ciliate desert-grass and the grass-seed of green bristlegrass are according to 1:1 weight ratio is bred；According to 30g/
m2Thickness of sowing sowed.Shrub plants schematic diagram as shown in figure 3, vegetation plantation schematic diagram is as shown in Figure 4.
Implement to measure after repairing one month and be free of heavy metal Hg in planting soil layer, the growing state for observing vegetation is good, deposits
Motility rate is 95%.
Embodiment 2
A kind of in-situ remediation method of mercury contaminated soil is present embodiments provided, land restoration area is 10m × 10m, packet
Include following steps：
1) levelling of the land：Every preparation is carried out, if removed all grounds, underground obstacle in place, excludes ground
Ponding, making temporary road etc..
2) in-situ solidifying：On the surface of mercury contaminated soil, paving spills lime curing soil, is then spread on the surface of curing soil
If the clay of 40-45cm thickness is as impervious barrier.
3) it is laid with planting soil layer, planting soil is backfilled to the work surface surface layer after Anti-seeping technology, planting soil layer thickness is 30-
35cm, and planting soil physical and chemical index meets《Planting technique soil》(CJ/T340-2016) requirement.
4) vegetation is planted：Shrub and vegetation class plant are planted, shrub plants serissa serissoide and raspberry, the kind of serissa serissoide and raspberry
Plant ratio is 5:1, plantation spacing is 0.5m × 0.5m；Vegetation plants green bristlegrass and ciliate desert-grass, the grass-seed and green bristlegrass of ciliate desert-grass
Grass-seed according to 5:1 weight ratio is bred；According to 20g/m2Thickness of sowing sowed.Implement to survey after repairing one month
It measures and is free of heavy metal Hg in planting soil layer, the growing state for observing vegetation is good, and plant survival rate is 90%.
Embodiment 3
A kind of in-situ remediation method of mercury contaminated soil is present embodiments provided, land restoration area is 10m × 10m, packet
Include following steps：
1) levelling of the land：Every preparation is carried out, if removed all grounds, underground obstacle in place, excludes ground
Ponding, making temporary road etc..
2) in-situ solidifying：On the surface of mercury contaminated soil, paving spills bentonite curing soil, then on the surface of curing soil
The clay of 20-25cm thickness is laid with as impervious barrier.
3) it is laid with planting soil layer, planting soil is backfilled to the work surface surface layer after Anti-seeping technology, planting soil layer thickness is 45-
50cm, and planting soil physical and chemical index meets《Planting technique soil》(CJ/T340-2016) requirement.
4) vegetation is planted：Shrub and vegetation class plant are planted, shrub plants serissa serissoide, and plantation spacing is 1.5m × 1.5m；
Vegetation plants green bristlegrass and ciliate desert-grass, and the grass-seed of ciliate desert-grass and the grass-seed of green bristlegrass are according to 1:5 weight ratio is bred；According to
40g/m2Thickness of sowing sowed.
Implement to measure after repairing one month and be free of heavy metal Hg in planting soil layer, the growing state for observing vegetation is good, plants
Object survival rate is 97%.
Embodiment 4
A kind of in-situ remediation method of mercury contaminated soil is present embodiments provided, land restoration area is 10m × 10m, packet
Include following steps：
1) levelling of the land：Every preparation is carried out, if removed all grounds, underground obstacle in place, excludes ground
Ponding, making temporary road etc..
2) in-situ solidifying：On the surface of mercury contaminated soil, paving spills hydroxyapatite curing soil, then in curing soil
Surface is laid with the clay of 50-60cm thickness as impervious barrier.
3) it is laid with planting soil layer, planting soil is backfilled to the work surface surface layer after Anti-seeping technology, planting soil layer thickness is 15-
20cm, and planting soil physical and chemical index meets《Planting technique soil》(CJ/T340-2016) requirement.
4) vegetation is planted：Green bristlegrass and ciliate desert-grass are planted, the grass-seed of ciliate desert-grass and the grass-seed of green bristlegrass are according to 5:1 weight
Than breeding；According to 50g/m2Thickness of sowing sowed.
Implement to measure after repairing one month and be free of heavy metal Hg in planting soil layer, the growing state for observing vegetation is good, plants
Object survival rate is 85%.
Embodiment 5
A kind of in-situ remediation method of mercury contaminated soil is present embodiments provided, land restoration area is 10m × 10m, packet
Include following steps：
1) levelling of the land：Every preparation is carried out, if removed all grounds, underground obstacle in place, excludes ground
Ponding, making temporary road etc..
2) in-situ solidifying：On the surface of mercury contaminated soil, paving spills calcium dihydrogen phosphate curing soil, then in curing soil
Surface is laid with the clay of 10-15cm thickness as impervious barrier.
3) it is laid with planting soil layer, planting soil is backfilled to the work surface surface layer after Anti-seeping technology, planting soil layer thickness is 60-
70cm, and planting soil physical and chemical index meets《Planting technique soil》(CJ/T340-2016) requirement.
4) vegetation is planted：Shrub and vegetation class plant are planted, shrub plants serissa serissoide, and plantation spacing is 2m × 2m；Vegetation
Green bristlegrass and ciliate desert-grass are planted, the grass-seed of ciliate desert-grass and the grass-seed of green bristlegrass are according to 1:2 weight ratio is bred；According to 30g/
m2Thickness of sowing sowed.
Implement to measure after repairing one month and be free of heavy metal Hg in planting soil layer, the growing state for observing vegetation is good, plants
Object survival rate is 85%.
Embodiment 6
A kind of in-situ remediation method of mercury contaminated soil is present embodiments provided, difference lies in plantation with embodiment 1
Shrub is tree peony, and the vegetation of plantation is Chinese holly, and Chinese holly is according to 30g/m2Thickness of sowing sowed.
Implement to measure after repairing one month and be free of heavy metal Hg in planting soil layer, the growing state for observing vegetation is good, plants
Object survival rate is 87%.
Embodiment 7
A kind of in-situ remediation method of contaminated soil is present embodiments provided, difference lies in by embodiment with embodiment 1
1 method provided is applied to the soil of heavy metal lead pollution.
Implement to measure after repairing one month and be free of heavy metal lead in planting soil layer, the growing state for observing vegetation is good, deposits
Motility rate is 93%.
Embodiment 8
A kind of in-situ remediation method of contaminated soil is present embodiments provided, difference lies in by embodiment with embodiment 1
1 method provided is applied to the soil of metalloid arsenic pollution.
Implement to measure after repairing one month and be free of metalloid arsenic in planting soil layer, the growing state for observing vegetation is good, deposits
Motility rate is 90%.
Comparative example 1
This comparative example provides a kind of in-situ remediation method of mercury contaminated soil, and difference lies in pollution with embodiment 1
Soil is uncured to be directly laid with impervious barrier in soil surface.
Implement to measure 0.132mg/kg containing heavy metal Hg in planting soil layer after repairing one month, plant survival rate is 82%.
Comparative example 2
This comparative example provides a kind of in-situ remediation method of mercury contaminated soil, and difference lies in through solid with embodiment 1
Contaminated soil surface after change is directly laid with planting soil layer.
Implement to measure 0.175mg/kg containing heavy metal Hg in planting soil layer after repairing one month, plant survival rate is 79%.
It in summary it can be seen, using the in-situ remediation method of heavy-metal contaminated soil provided by the invention, by passing through
The contaminated soil upper berth of curing process is set up defences infiltration layer, planting soil layer is then laid on impervious barrier, and planted in planting soil layer
Contaminated soil original flavor can effectively be cured, not migrated to untainted soil by vegetation, and have passed through Anti-seeping technology and
The good growth of vegetation can be made by being laid with planting soil layer, it is therefore prevented that the loss of the unpolluted soil in surface, when not cured place
Reason directly plants vegetation without Anti-seeping technology, can reduce the effect of contaminated soil original position.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of in-situ remediation method of heavy-metal contaminated soil, which is characterized in that the in-situ remediation method includes following step
Suddenly：It sets up defences infiltration layer on the contaminated soil upper berth Jing Guo curing process, planting soil layer is then laid on impervious barrier, and in planting soil
Vegetation is planted on layer.
2. in-situ remediation method according to claim 1, which is characterized in that the curing process is included in soil surface and applies
Use curing agent；It is preferred that applying curing agent in such a way that paving is spilt.
3. in-situ remediation method according to claim 1, which is characterized in that the thickness of the impervious barrier is 20-45cm；Institute
Impervious barrier is stated mainly to be made of clay.
4. in-situ remediation method according to claim 1, which is characterized in that the thickness of the planting soil layer is 30-50cm.
5. in-situ remediation method according to claim 1, which is characterized in that the vegetation is that shrub plant and draft are planted
Object.
6. in-situ remediation method according to claim 5, which is characterized in that the plantation spacing of the shrub plant is
50-150cm。
7. in-situ remediation method according to claim 5, which is characterized in that the shrub plant include serissa serissoide and/
Or Rubus corchorifolius, the herbaceous plant include ciliate desert-grass and green bristlegrass.
8. in-situ remediation method according to claim 7, which is characterized in that the grass-seed of the ciliate desert-grass and the green bristlegrass
Grass-seed according to (1-5)：The weight ratio of (5-1) is bred；According to 20-40g/m2Thickness of sowing sowed.
9. according to the in-situ remediation method described in any one of claim 1-8, which is characterized in that the soil of the heavy metal pollution
Earth is the soil of mercury pollution.
10. purposes of the in-situ remediation method in industrial pollution site remediation described in any one of claim 1-9.
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| CN109821867A (en) * | 2019-02-22 | 2019-05-31 | 湖南恒凯环保科技投资有限公司 | A kind of mixed fertilizer for repairing mercury pollution and middle low mercury contaminated soil plant restorative procedure |
| CN110369470A (en) * | 2019-08-23 | 2019-10-25 | 武汉市园林建筑工程公司 | A kind of method of soil pollution reparation |
| CN110420963A (en) * | 2019-05-21 | 2019-11-08 | 中节能大地环境修复有限公司 | The curing method of pollutant in a kind of completely decomposed layer |
| CN113575007A (en) * | 2021-07-21 | 2021-11-02 | 广东禹兴建设工程有限公司 | Farmland reclamation method |
| CN115254943A (en) * | 2022-04-08 | 2022-11-01 | 中国科学院地球化学研究所 | Remediation and treatment method for soil in historical mercury pollution leaving site |
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