CN106311736A - System and method for restoring contaminated soil - Google Patents
System and method for restoring contaminated soil Download PDFInfo
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- CN106311736A CN106311736A CN201610736738.3A CN201610736738A CN106311736A CN 106311736 A CN106311736 A CN 106311736A CN 201610736738 A CN201610736738 A CN 201610736738A CN 106311736 A CN106311736 A CN 106311736A
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- layer
- soil
- breather
- contaminated soil
- degradation
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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
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention discloses a system and method for restoring contaminated soil and belongs to contaminated soil in-situ restoration technologies. The system comprises two or more breather pipe layers, a micro-biological degradation layer and a plant plantation soil layer, wherein the breather pipe layers are arranged downwards from the ground surface one by one; each breather pipe layer is horizontally embedded in a contaminated soil area; breather pipes are arranged in each breather pipe layer in parallel; the pipe wall of each breather pipe is provided with small holes which are used for outputting gas inflated into the corresponding breather pipe and heavy metal curing agent powder; the micro-biological degradation layer is laid on the ground surface of the contaminated soil area and used for obstructing volatilization of organic contaminants and degradation of the organic contaminants; and the plant plantation soil layer is laid on the micro-biological degradation layer and used for planting plants therein. By means of the system and method for restoring the contaminated soil, in-situ restoration can be conducted on the soil contaminated by the organic contaminants and heavy metal at the same time; and the system and method have the beneficial effect of being high in restoration efficiency.
Description
Technical field
The present invention relates to contaminated soil based technique for in-situ remediation field, be specifically related to a kind of renovation of organic pollution and/or a huge sum of money
Belong to the system and method for contaminated soil.
Background technology
For many years due to the discharge of industrial or agricultural pollutant, soil contamination problem has become the global ring that the public pays high attention to
Border and social problem.The pollution of soil has Organic Pollution and heavy metal pollution.
Bioremediation technology can be defined as: by using ecosystem (including microorganism, plant and enzyme) by ring
Contaminant degradation in border, consume, decompose, convert, metabolism and/or remove.Phytoremediation as the one of bioremediation technology,
Refer to be degraded by plant and relevant microorganism, isolate or pollutant in biological concentration soil and water.Phytoremediation
Fundamental type mainly has plant extract reparation, phytovolatilization reparation, Phytostabilization, plant degradation reparation and rhizosphere circle biological
Degraded is repaired.A kind of method of environmental friendliness, cost performance height and carbon neutralization that this method provides is to the poisonous dirt removing in environment
Dye thing.Many research reports have been had successfully to use phytoremediation to remove volatility or non-volatile organic pollution, weight
The example of the point pollution that metal, radioactive substance and agrochemical cause.
Current most of recovery techniques or be the single recovery technique for organic pollution contaminated soil, or be
The single recovery technique for heavy-metal contaminated soil.But, in many cases, in organic pollution contaminated soil usually
Also can contain or the heavy metal pollution of high or low concentration, in this case, current most of recovery techniques cannot realize this
The reparation of kind of contaminated soil, and owing to the toxicity of microorganism also can be reduced the efficiency of organic pollutant degradation by heavy metal.
Summary of the invention
Therefore, the embodiment of the present invention to solve the technical problem that and to be that contaminated soil remediation technology of the prior art cannot
Organic pollution and heavy-metal contaminated soil are repaired simultaneously.
To this end, the system of a kind of repairing polluted soil of the embodiment of the present invention, including:
At least two-layer ventilation tube layer, it arranges the most layer by layer from ground surface, and every layer of ventilation tube layer level landfill is polluting
In soil region, in every layer of ventilation tube layer, parallel is furnished with breather, the tube wall of breather has aperture, is used for exporting ventilation
The gas being filled with in pipe and heavy metals immobilization agent powder；
Microbial degradation layer, is layed in above the ground surface of contaminated soil region, for intercepting the volatilization of organic pollution and to it
Degrade；
Plant growing soil layer, is layed in the top of microbial degradation layer, for planting plants.
Preferably,
The arragement direction of the breather of adjacent ventilation tube layer is parallel to each other or is mutually perpendicular to.
Preferably,
Vertical dimension between ventilation tube layer and ground surface is 0.5-1.5 rice, and the vertical dimension between adjacent ventilation tube layer is
0.5-1.5 rice；And/or
Horizontal range between adjacent breather is 0.5-1 rice.
Preferably, during heavy metals immobilization agent includes aluminum sulfate, aluminium potassium sulfate, aluminum sodium sulfate, aluminum chloride, aluminium chloride ferrum
Plant or several.
Preferably, microbial degradation layer includes wrapping up the preparation of degradation bacteria, activated carbon and the mixture of clean soil, parcel
The mass parts ratio of the preparation of degradation bacteria, activated carbon and clean soil is (0.35-0.65): (1-2): (5-8).
Preferably, degradation bacteria includes Xanthomonas campestris, Rhodococcus fascians, Bacillus alcaligenes, root nodule bacteria, streptomycete, Burkholderia, colourless
One in bacillus, Flavobacterium, micrococcus luteus, bacillus cereus, staphylococcus, acinetobacter calcoaceticus, Agrobacterium, arthrobacterium and corynebacterium
Or it is several.
Preferably, plant growing soil layer includes sand, turfy soil, activated carbon, calcium superphosphate and the mixture of clean soil,
The mass parts ratio of sand, turfy soil, activated carbon, calcium superphosphate and clean soil is (1.5-2): (0.5-1): (0.3-2):
(0.2-0.5): (10-20).
The method of a kind of repairing polluted soil of the embodiment of the present invention, comprises the following steps:
Below the ground surface of contaminated soil region, level landfill ground floor ventilation tube layer at 5-10 rice, the most every the most vertical
Interval 0.5-1.5 rice level fills one layer of ventilation tube layer (1), until ground surface；In every layer of ventilation tube layer, parallel is furnished with ventilation
Pipe, the tube wall of breather has aperture；
Microbial degradation layer is laid above the ground surface of contaminated soil region；
Plant growing soil layer is laid above microbial degradation layer；
In breather, persistently it is filled with oxygen-containing gas, and is disposably filled with enough heavy metals immobilization agent powder.
Preferably,
Microbial degradation layer includes wrapping up the preparation of degradation bacteria, activated carbon and the mixture of clean soil, the system of parcel degradation bacteria
The mass parts ratio of agent, activated carbon and clean soil is (0.35-0.65): (1-2): (5-8)；And/or
Plant growing soil layer includes sand, turfy soil, activated carbon, calcium superphosphate and the mixture of clean soil, sand, the peat composed of rotten mosses
The mass parts ratio of soil, activated carbon, calcium superphosphate and clean soil is (1.5-2): (0.5-1): (0.3-2): (0.2-0.5):
(10-20).
Preferably, the preparation method of the preparation of described parcel degradation bacteria comprises the following steps:
Isopyknic alginate is mixed to get mutually with degradation bacteria mixture；
Mixture is instilled equipped with in the container of U-Ramin MC, forms bead；
Bead stores in U-Ramin MC reservation makes it become hard for 0.5-5 hour；
Take out and become hard bead and clean up with distilled water, it is thus achieved that the preparation of parcel degradation bacteria.
The technical scheme of the embodiment of the present invention, has the advantage that
1. the system of the repairing polluted soil that the embodiment of the present invention provides, fills multilamellar energy by level in contaminated soil region
The narrow meshed breather of the materials such as enough insufflation gas, can inflate air to inside contaminated soil, thus oxygen coordinates a huge sum of money
Belong to the effect of firming agent powder, the heavy metal contaminants in contaminated soil can be made to obtain fully, fully redox reaction,
The heavy metal ion that formation can be absorbed by plant root growth effect, improves the efficiency of soil remediation.By at plant growing soil
Lay microbial degradation layer between layer and ground surface, microorganism can be first passed through organic to upwards volatilized by contaminated soil
Pollutant carry out adsorbing and degrading, and intercept organic pollution volatilization in air.The growth of the root system of plant can pass through plant
Plantation soil layer and microbial degradation layer extend into contaminated soil region, thus root exudates can be to non-volatile, undegradable
Organic pollution carries out complexation degraded, enhances the Degradation to organic pollution, it is achieved thereby that have in contaminated soil
In-situ immobilization while organic pollutants and heavy metal, to reach both to reduce pollutant volatilization, to reduce it and be enriched with food chain, again can
Safe and efficient degraded, the purpose of conversion pollutant.
2. the method for repairing polluted soil that the embodiment of the present invention provides, by level in contaminated soil region fill into
Multilayer ventilating pipe in be filled with heavy metals immobilization agent powder and be filled with oxygen-containing gas in continuous 5-30 days after, it is possible to make in contaminated soil
Heavy metal contaminants obtain fully, fully redox reaction, form the huge sum of money that can be absorbed by plant root growth effect
Belong to ion, improve the efficiency of soil remediation.By directly laying microbial degradation layer and plant species after landfill ventilation tube layer
Plant soil layer, it is not necessary to contaminated soil is carried out scarifying or transport, so that it may planting plants on plant growing soil layer, decrease reparation dirt
Operation needed for dye soil, accelerates soil remediation speed, and due to operation of not digging contaminated soil, it also avoid and easily wave
The pollutant sent out enter air and cause the pollution to air etc., decrease the secondary pollution that repair is caused.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the specific embodiment of the invention, detailed description of the invention will be retouched below
In stating, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is some realities of the present invention
Execute mode, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to attached according to these
Figure obtains other accompanying drawing.
Fig. 1 is the structural representation of a concrete example of the system of repairing polluted soil in the embodiment of the present invention 1；
Fig. 2 is the schematic diagram of a concrete example of adjacent ventilation tube layer Center Vent tube arrangement mode in the embodiment of the present invention 1；
Fig. 3 is the flow chart of a concrete example of the method for repairing polluted soil in the embodiment of the present invention 2.
Reference: 1-ventilates tube layer, 11-breather, 2-microbial degradation layer, 3-plant growing soil layer, S-ground surface,
W-contaminated soil region.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described, it is clear that described enforcement
Example is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
In describing the invention, it should be noted that term " top ", " lower section " etc. instruction orientation or position relationship
For based on orientation shown in the drawings or position relationship, be for only for ease of the description present invention and simplifying describe rather than instruction or
Hint indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that
Limitation of the present invention.Additionally, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or
Hint relative importance.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be fixing connection, it is also possible to be to removably connect, or be integrally connected；Can
Being to be joined directly together, it is also possible to be indirectly connected to by intermediary, it is also possible to be the connection of two element internals.For this area
Those of ordinary skill for, can with concrete condition understand above-mentioned term concrete meaning in the present invention.
If additionally, the most non-structure of technical characteristic involved in invention described below difference embodiment
Become conflict just can be combined with each other.
Embodiment 1
The present embodiment provides the system of a kind of repairing polluted soil, can be used for repairing and contains organic pollution and heavy metal simultaneously
Contaminated soil, organic pollution can be, but not limited to, crude oil, gasoline or diesel oil, heavy lubricating oil, insecticide, Polychlorinated biphenyls,
Two English/furan, chloride or polycyclic aromatic hydrocarbon etc., or other organic pollutions.Heavy metal including, but not limited to lead, chromium, arsenic,
Zinc, cadmium, copper, hydrargyrum and nickel etc..As it is shown in figure 1, this system includes: at least two-layer ventilation tube layer 1, microbial degradation layer 2 and plant
Plantation soil layer 3.At least two-layer ventilation tube layer 1 is arranged the most layer by layer from ground surface S, every layer of ventilation tube layer 1 level landfill
In the W of contaminated soil region, in every layer of ventilation tube layer 1, parallel is furnished with breather 11, and the tube wall of breather 11 has aperture,
For exporting the gas being filled with in breather 11 and heavy metals immobilization agent powder.Microbial degradation floor 2 is layed in contaminated soil district
Above the ground surface of territory, for intercepting the volatilization of organic pollution and it being degraded.Plant growing soil layer 3 is layed in microorganism
The top of degraded layer 2, for planting plants.Plant can be the various suitable lifes with phytoremediation and pollutant tolerance
Long species, the plant of preferably suitable local geographical conditions.Can be such as rye grass, alfalfa, Festuca Arundinacea, Brassica campestris L, to
Day certain herbaceous plants with big flowers, English grass, fern, willow, Cortex Populi dividianae and red mulberry etc., but it is not limited to these.
The system of above-mentioned repairing polluted soil, can insufflation gas etc. by the landfill multilamellar of level in contaminated soil region
The narrow meshed breather of material, can inflate air to inside contaminated soil, thus oxygen coordinates heavy metals immobilization agent powder
Effect, the heavy metal contaminants in contaminated soil can be made to obtain fully, fully redox reaction, formation can be by plant
The heavy metal ion that root growth effect absorbs, improves the efficiency of soil remediation.By plant growing soil layer and ground surface it
Between lay microbial degradation layer, microorganism can be first passed through the organic pollution upwards volatilized by contaminated soil is inhaled
Echo degraded, intercept organic pollution volatilization in air.The growth of the root system of plant can be by plant growing soil layer and micro-
Biodegradation layer extends into contaminated soil region, thus organic pollution non-volatile, undegradable can be entered by root exudates
Row complexation is degraded, and enhances the Degradation to organic pollution, it is achieved thereby that to organic pollution in contaminated soil and weight
In-situ immobilization while metal, to reach both to reduce pollutant volatilization, to reduce it and be enriched with food chain, can safe and efficient drop again
Solution, the purpose of conversion pollutant.
Preferably, the arragement direction of the breather 11 of adjacent ventilation tube layer 1 is parallel to each other or is mutually perpendicular to.Such as, such as Fig. 2
Shown in, in adjacent ventilation tube layer, the breather 11 of arrangement is mutually perpendicular to.Shown in breather 11 shown in solid in Fig. 2 and dotted line
Breather 11 is the breather of arrangement in adjacent ventilation tube layer.By this orthogonal arrangement mode, it is possible to make to be filled with
Gas and heavy metals immobilization agent powder more uniformly enter in contaminated soil, promote to repair reaction more fully, carry further
The high remediation efficiency of contaminated soil.It addition, the arrangement shape of breather 11 is not limited to the linear shown in Fig. 2, it is possible to
To be circular concentric etc..
Vertical dimension between adjacent ventilation tube layer 1 specifically can be arranged according to the contaminated degree in contaminated soil region,
Usually, the vertical dimension between ventilation tube layer 1 and ground surface is 0.5-1.5 rice, the vertical dimension between adjacent ventilation tube layer 1
For 0.5-1.5 rice, to adapt to the contaminated degree in most of contaminated soil region.Equally, the level between adjacent breather 11
Distance also specifically can be arranged according to the contaminated degree in contaminated soil region, usually, and the level between adjacent breather 11
Distance is 0.5-1 rice, to adapt to the contaminated degree in most of contaminated soil region.
Preferably, during heavy metals immobilization agent includes aluminum sulfate, aluminium potassium sulfate, aluminum sodium sulfate, aluminum chloride, aluminium chloride ferrum
Plant or several, due to the effect of heavy metals immobilization agent, coordinate the oxygen-containing gas being filled with, can more effectively carry out heavy metal solid
Change reaction, make the heavy metal cadmium in soil, chromium, hydrargyrum, lead, arsenic, nickel, zinc, copper, manganese and vanadium etc. lose its biological effectiveness.With much money
Belong to firming agent powder and sieve institute's sieve series acquisition through 0.25mm, it is possible to blown afloat by gas completely and enter in contaminated soil, or directly
Tap in the gap of contaminated soil, or enter in contaminated soil with the steam in contaminated soil.
Preferably, microbial degradation layer 2 includes wrapping up the preparation of degradation bacteria, activated carbon and the mixture of clean soil, bag
The mass parts ratio wrapping up in the preparation of degradation bacteria, activated carbon and clean soil is (0.35-0.65): (1-2): (5-8).Parcel degradation bacteria
Material include but not limited to alginate, the process of the preparation of preparation parcel degradation bacteria is: isopyknic alginate and fall
Solve bacterium to mix mutually, instill in the container containing U-Ramin MC, form the bead of 1-5mm.Bead stops 0.5-5 in U-Ramin MC
Hour so that its change is hard, then clean up with distilled water, it is thus achieved that the preparation of parcel degradation bacteria.Preparation is typically below 4 DEG C
Store.
Preferably, degradation bacteria includes Xanthomonas campestris, Rhodococcus fascians, Bacillus alcaligenes, root nodule bacteria, streptomycete, Burkholderia, colourless
One in bacillus, Flavobacterium, micrococcus luteus, bacillus cereus, staphylococcus, acinetobacter calcoaceticus, Agrobacterium, arthrobacterium and corynebacterium
Or several, can more effectively degradable organic pollutant.
Preferably, plant growing soil layer 3 includes sand, turfy soil, activated carbon, calcium superphosphate and the mixing of clean soil
Thing, the mass parts ratio of sand, turfy soil, activated carbon, calcium superphosphate and clean soil is (1.5-2): (0.5-1): (0.3-2):
(0.2-0.5): (10-20).The average particle size of sand is 0.2-0.6mm, and the average particle size of turfy soil is 0.2-
0.9mm, the mean diameter of activated carbon is 0.3-0.6mm, so that it is more suitable for the growth of plant.
With a concrete example, the system of repairing polluted soil is illustrated below.
Contaminated soil region area 1000 meters2, the degree of depth 5 meters.Every vertical dimension 1 meter below the ground surface of contaminated soil region
Arrangement breather, the horizontal range between adjacent breather is 0.5 meter, lays micro-life that 0.3-0.5 rice is thick above ground surface
Thing degraded layer, then above microbial degradation layer, lay the plant growing soil layer that 0.3-0.5 rice is thick.Air it is filled with in breather
With comprise the heavy metals immobilization agent powder 100g of aluminum sulfate, aluminium potassium sulfate, aluminum sodium sulfate, aluminum chloride and aluminium chloride ferrum, arrange micro-
Biodegradation layer comprises mass parts than the preparation of parcel degradation bacteria, activated carbon and the clean soil for 0.5:1:7, wherein degradation bacteria
Including Xanthomonas campestris, Rhodococcus fascians, root nodule bacteria, streptomycete, achromobacter, Flavobacterium, bacillus cereus, Agrobacterium, arthrobacterium and rod
Shape bacillus.Plant growing soil layer is set and comprises mass parts than for the sand of 2:1:1:0.3:15, turfy soil, activated carbon, peroxophosphoric acid
Calcium and clean soil.The moisture content keeping plant growing soil layer is between 10%-30%, after being disposably filled with heavy metals immobilization agent,
Persistently it is filled with air maintenance 7-15 days.
Spacing 0.3 meter plantation rye grass on plant growing soil layer, after planting 3 months, pollutant in testing soil, as follows
Shown in table.
| Pollutant | Content (mg/kg) before repairing | Content (mg/kg) after reparation | Level threshold value (mg/kg) |
| Cadmium | 0.07 | 0.03 | ≤0.30 |
| Chromium | 430 | 50 | ≤250 |
| Hydrargyrum | 0.80 | 0.11 | ≤0.30 |
| Lead | 340 | 86 | ≤250 |
| Arsenic | 35 | 3 | ≤20 |
| Nickel | 86 | 8 | ≤40 |
| Zinc | 340 | 98 | ≤200 |
| Copper | 97 | 34 | ≤50 |
The detection method of each pollutant is all according to the regulation of GB15618-1995.
Before repairing, in contaminated soil, the concentration of pentachlorobenzene is 1ug/g, has planted the degraded of pentachlorobenzene in the soil of rye grass
Rate reaches 35%-50%, it can be seen that, the system of above-mentioned repairing polluted soil can be simultaneously to organic pollution and heavy metal pollution
Soil carries out significant in-situ immobilization.
Embodiment 2
The present embodiment provides the method that the system of a kind of repairing polluted soil utilizing embodiment 1 carries out repairing polluted soil, as
Shown in Fig. 3, comprise the following steps:
S1, underground ventilation tube layer construction: (according to actual contaminated soil region at 5-10 rice below the ground surface of contaminated soil region
Scope determines) level landfill ground floor ventilation tube layer 1, the most every perpendicular separation 0.5-1.5 rice level fills one layer
Ventilation tube layer 1, until ground surface；In every layer of ventilation tube layer 1, parallel is furnished with breather 11, the tube wall of breather 11 has little
Hole；
S2, laying microbial degradation layer: above the ground surface of contaminated soil region, lay 0.3-0.5 rice microbial degradation layer 2；
S3, laying plant growing soil layer: above microbial degradation layer 2, lay 0.3-0.5 rice plant growing soil layer 3；
S4, oxygen-containing gas and heavy metals immobilization agent powder are filled with breather: be persistently filled with oxygen-containing gas, and one in breather 11
Secondary property is filled with enough heavy metals immobilization agent powder.Such as, area 1000 meters2, the contaminated soil region of the degree of depth 5 meters optional fills
Enter 100g heavy metals immobilization agent powder.
After above-mentioned steps S1-S4 completes 5-30 days, the moisture content keeping plant growing soil layer is between 10%-30%, is planting
Species are planted plantation on soil layer and are had the species of the suitable growth of phytoremediation and pollutant tolerance, such as rye grass, pale reddish brown lucerne
Mu, Festuca Arundinacea, Brassica campestris L, Helianthi, English grass, fern, willow, Cortex Populi dividianae and red mulberry etc., but it is not limited to these.
The method of above-mentioned repairing polluted soil, fills by the multilayer ventilating pipe that level in contaminated soil region fills
After entering heavy metals immobilization agent powder and being filled with oxygen-containing gas in continuous 5-30 days, it is possible to make the heavy metal contaminants in contaminated soil obtain
To fully, fully redox reaction, form the heavy metal ion that can be absorbed by plant root growth effect, improve soil and repair
Multiple efficiency.By directly laying microbial degradation layer and plant growing soil layer after landfill ventilation tube layer, it is not necessary to pollution
Soil carries out scarifying or transport, so that it may planting plants on plant growing soil layer, decreases the operation needed for repairing polluted soil,
Accelerate soil remediation speed, and due to operation of contaminated soil not being digged, it also avoid volatile pollutant and enter big
Gas and cause the pollution to air etc., decrease the secondary pollution that repair is caused.By on plant growing soil layer and ground
Lay the microbial degradation layer of 0.3-0.5 rice between surface, microorganism can be first passed through and upwards volatilize by contaminated soil
Organic pollution carry out adsorbing and degrading, intercept organic pollution volatilization in air.The growth of the root system of plant can be led to
Cross plant growing soil layer and microbial degradation layer extends into contaminated soil region, thus root exudates can be to non-volatile, not
The organic pollution of degraded carries out complexation degraded, enhances the Degradation to organic pollution, it is achieved thereby that to Polluted Soil
In-situ immobilization while organic pollution and heavy metal in earth.
Preferably, microbial degradation layer 2 includes wrapping up the preparation of degradation bacteria, activated carbon and the mixture of clean soil, bag
The mass parts ratio wrapping up in the preparation of degradation bacteria, activated carbon and clean soil is (0.35-0.65): (1-2): (5-8).
Plant growing soil layer 3 includes sand, turfy soil, activated carbon, calcium superphosphate and the mixture of clean soil, sand,
The mass parts ratio of turfy soil, activated carbon, calcium superphosphate and clean soil is (1.5-2): (0.5-1): (0.3-2): (0.2-
0.5): (10-20).
Preferably, the preparation method of the preparation of above-mentioned parcel degradation bacteria comprises the following steps:
S21, isopyknic alginate is mixed to get mutually with degradation bacteria mixture；
S22, mixture is instilled equipped with in the container of U-Ramin MC, form the bead of 1-5mm；
S23, bead is stored in U-Ramin MC reservation within 0.5-5 hour, make it become hard；
S24, taking-up become hard bead and clean up with distilled water, it is thus achieved that the preparation of parcel degradation bacteria.
The preparation of the parcel degradation bacteria of the 1-5mm prepared by said method, it is possible to preserve well below 4 DEG C
The activity of degradation bacteria, and degradation bacteria can be discharged fully when it is applied in soil environment, thus increase soil ring
The degradation capability in border.
Obviously, above-described embodiment is only for clearly demonstrating example, and not restriction to embodiment.Right
For those of ordinary skill in the field, can also make on the basis of the above description other multi-form change or
Variation.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or
Change among still in the protection domain of the invention.
Claims (10)
1. the system of a repairing polluted soil, it is characterised in that including:
At least two-layer ventilation tube layer (1), it is arranged the most layer by layer from ground surface, every layer of ventilation tube layer (1) level landfill
In contaminated soil region, every layer of ventilation tube layer (1) interior parallel is furnished with breather (11), and the tube wall of breather (11) has
Aperture, is used for exporting the gas being filled with in breather (11) and heavy metals immobilization agent powder；
Microbial degradation layer (2), is layed in above the ground surface of contaminated soil region, for intercepting the volatilization of organic pollution and right
It is degraded；
Plant growing soil layer (3), is layed in the top of microbial degradation layer (2), for planting plants.
System the most according to claim 1, it is characterised in that
The arragement direction of the breather (11) of adjacent ventilation tube layer (1) is parallel to each other or is mutually perpendicular to.
System the most according to claim 1 and 2, it is characterised in that
Ventilation tube layer (1) and ground surface between vertical dimension be 0.5-1.5 rice, between adjacent ventilation tube layer (1) vertical away from
From for 0.5-1.5 rice；And/or
Horizontal range between adjacent breather (11) is 0.5-1 rice.
4. according to the system described in any one of claim 1-3, it is characterised in that heavy metals immobilization agent includes aluminum sulfate, sulphuric acid
One or more in aluminum potassium, aluminum sodium sulfate, aluminum chloride, aluminium chloride ferrum.
5. according to the system described in any one of claim 1-4, it is characterised in that microbial degradation layer (2) includes parcel degraded
The preparation of bacterium, activated carbon and the mixture of clean soil, the parcel preparation of degradation bacteria, activated carbon and the mass parts ratio of clean soil
For (0.35-0.65): (1-2): (5-8).
System the most according to claim 5, it is characterised in that degradation bacteria include Xanthomonas campestris, Rhodococcus fascians, Bacillus alcaligenes,
Root nodule bacteria, streptomycete, Burkholderia, achromobacter, Flavobacterium, micrococcus luteus, bacillus cereus, staphylococcus, acinetobacter calcoaceticus, agriculture bar
One or more in bacterium, arthrobacterium and corynebacterium.
7. according to the system described in any one of claim 1-6, it is characterised in that plant growing soil layer (3) includes sand, the peat composed of rotten mosses
Soil, activated carbon, calcium superphosphate and the mixture of clean soil, sand, turfy soil, activated carbon, calcium superphosphate and clean soil
Mass parts is than being (1.5-2): (0.5-1): (0.3-2): (0.2-0.5): (10-20).
8. the method for a repairing polluted soil, it is characterised in that comprise the following steps:
Below the ground surface of contaminated soil region, level landfill ground floor ventilation tube layer (1) at 5-10 rice, the most every
Perpendicular separation 0.5-1.5 rice level fills one layer of ventilation tube layer (1), until ground surface；Every layer of ventilation tube layer (1) interior parallel arrangement
There is breather (11), the tube wall of breather (11) has aperture；
Microbial degradation layer (2) is laid above the ground surface of contaminated soil region；
Plant growing soil layer (3) is laid in microbial degradation layer (2) top；
In breather (11), persistently it is filled with oxygen-containing gas, and is disposably filled with enough heavy metals immobilization agent powder.
Method the most according to claim 8, it is characterised in that
Microbial degradation layer (2) includes wrapping up the preparation of degradation bacteria, activated carbon and the mixture of clean soil, parcel degradation bacteria
The mass parts ratio of preparation, activated carbon and clean soil is (0.35-0.65): (1-2): (5-8)；And/or
Plant growing soil layer (3) includes sand, turfy soil, activated carbon, calcium superphosphate and the mixture of clean soil, sand, grass
The mass parts ratio of charcoal soil, activated carbon, calcium superphosphate and clean soil is (1.5-2): (0.5-1): (0.3-2): (0.2-0.5):
(10-20).
Method the most according to claim 9, it is characterised in that the preparation method of the preparation of described parcel degradation bacteria includes
Following steps:
Isopyknic alginate is mixed to get mutually with degradation bacteria mixture；
Mixture is instilled equipped with in the container of U-Ramin MC, forms bead；
Bead stores in U-Ramin MC reservation makes it become hard for 0.5-5 hour；
Take out and become hard bead and clean up with distilled water, it is thus achieved that the preparation of parcel degradation bacteria.
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