CN108817050A - A kind of engineering of heavy-metal contaminated soil-agronomy in-situ remediation method and device - Google Patents
A kind of engineering of heavy-metal contaminated soil-agronomy in-situ remediation method and device Download PDFInfo
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- CN108817050A CN108817050A CN201810550241.1A CN201810550241A CN108817050A CN 108817050 A CN108817050 A CN 108817050A CN 201810550241 A CN201810550241 A CN 201810550241A CN 108817050 A CN108817050 A CN 108817050A
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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
- 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
- B09C2101/00—In situ
Abstract
A kind of engineering of heavy-metal contaminated soil-agronomy in-situ remediation method and device are laid at heavy-metal contaminated soil soil depth and horizontally descend hidden pipe and vertically collect seepage pipe；Powdery ridge subsoiling is carried out to the soil layer of heavy metal pollution, chesson simultaneously breaks haftplatte layer；Using Na2The elution of the combination solution of-EDTA and citric acid collects the heavy metal leacheate in vertical collection seepage pipe using suction unit, collects the heavy metal leakage liquid for horizontally descending hidden pipe to flow out；With (NH4)2SO4Washed off soil and suction and collection effusion again；It applies maize cob meal and is blended the soil of maize cob meal and heavy metal pollution soil layer uniformly using powder ridge machine, heavy-metal contaminated soil reparation is completed in immersion of pouring water after infiltrating completely.
Description
Technical field
The present invention relates to the soil of heavy metal pollution engineering-agronomy to repair field, in particular to a kind of heavy metal polluted soil
The engineering of earth-agronomy in-situ remediation method and device.
Background technique
China was in newest publication in 2014《National Soil Pollution Investigation bulletin》It has been shown that, national Farmland contamination object point
Position exceeding standard rate is close to 1/5, and using heavy metal as inorganic pollution (cadmium, mercury, arsenic, copper, lead, chromium, zinc, nickel) exceeded point of representative
Digit accounts for the 82.8% of all exceeded points, occupy main status.Farmland soil heavy metals pollution problem, which has become, threatens me
One of an important factor for state's grain security and agricultural sustainable development.
Compared to place soil pollution, heavy metals in farmland soil pollution has the characteristics that oneself uniqueness.Firstly, agricultural land soil weight
Metal is mostly derived from the atmospheric sedimentation of pollutant, sewage agriculture fills, agricultural substance is applied etc., therefore its type is generally with pollution of area source
Based on, the object of pollution amelioration is the farmland of large area rather than the place of a certain zonule；Secondly, Farmland Soil Pollution is horizontal
Overall the concealment of harm is stronger based on middle low concentration, can not cause the enough attention of people, the power and fund of reparation
It is usually insufficient；In addition, farmland soil heavy metals pollution is usually combined pollution caused by various heavy；Finally, contaminated
Farmland usually still keeps agricultural production, can not fully achieve reparation of being temporarily released from one's regular work.Based on These characteristics, farmland soil heavy metals pollution
Repairing has higher requirement for rehabilitation expense, efficiency, while requiring to combine with agricultural production, and engineering is mutually tied with agronomic measures
Close rather than simple engineering measure.
Heavy metal pollution of soil repair mode is broadly divided into original position and dystopy two major classes, and specific recovery technique mainly has physics
Separation, steam extraction, electro reclamation, chemical leaching, solidification and stabilization and biological prosthetic etc..Wherein physical separation, steam extraction,
The technologies such as electro reclamation and solidification and stabilization due to it is with high costs, simultaneously can generate adverse effect to soil texture and function, and
It is not suitable for agricultural land soil reparation, although the biological prosthetic contaminated soil remediation suitable for large area, and relative inexpensiveness, it is secondary
Act on small, but repairing efficiency is longer, and the screening of hyperaccumulative plant, and the culture and universality for repairing strain are a disasters
Point.Under suitable eluent and elution process conditions, elution, which is repaired, has simple process, and remediation efficiency is high, adaptable, at
The advantages that this is moderate, strong operability, and there has been and be widely applied in actual repair work at home and abroad.
At present for the elution technique research of heavy metal pollution of soil reparation mainly in elution agent prescription, ELUTION METHOD and work
In terms of the exploration of skill and experimental provision.Typical represent mainly has：Chinese patent CN 104479682A discloses an a kind of huge sum of money
The preparation method for belonging to lead-contaminated soil leacheate, has been prepared by mixing into one kind using aspergillus niger bacterium solution, tea seed cake and lactic acid as raw material
Metal lead-contaminated soil leacheate.102500612 B of Chinese patent CN discloses a kind of for restoration of soil polluted by heavy metal
Chemical leaching repairing method, this method elute heavy-metal contaminated soil using Na2EDTA solution, effectively remove soil available
Cadmium and lead, and utilize Na2S·9H2O carrys out the heavy metal in precipitation filtrates, makes Na2EDTA retrieves release, to reach
Na2The recycled for multiple times of EDTA solution.107159698 A of Chinese patent CN discloses a kind of three-dimensional well elution joint stabilization
Change the method for in-situ remediation soil polluted by heavy metals, this approach includes the following steps：Laid inside huge sum of money contaminated soil layer to
Infiltration adsorption layer is arranged in heavy-metal contaminated soil layer bottom in few three layers of three-dimensional well；Using three-dimensional well to elution heavy metal pollution
Soil horizon from top to bottom successively elutes, and to injection stabilizer inside huge sum of money contaminated soil layer and pours into clay by each layer three-dimensional well
Cement slurry, this method can be realized heavy-metal contaminated soil and elute and stabilize curing process in situ, by preventing leacheate pair
Underground water secondary pollution meets the quick reparation of heavy-metal contaminated soil.
Existing Soil leaching technology is all limited to the self problem of heavy metal pollution of soil reparation, simple only from engineering angle
Degree goes to consider reparation problem, does not fully consider the application conditions in real work, especially Farmland Soil Pollution feature and and agriculture
The adaptable problem of industry production activity, while existing elution technique does not account for eluent to the re-activation of heavy metal-polluted soil
Bring potential risk.
Summary of the invention
The technical issues of solution：The present invention at high cost, low efficiency, process for current remediation of heavy metal-contaminated soil
The deficiencies of complicated, and it is an object of the present invention to provide a kind of heavy-metal contaminated soil engineering-agronomy in-situ remediation method and device, coupling
" activation elution-engineering elution-active passivation " key link, accelerates heavy metallic activation elution by chemical leaching, in conjunction with work
Journey promotees leaching and promotes total metals abatement, using agronomic measures passivation residual heavy metal activity, improves the rate of recovery accelerating to elute
While, eluent existing for existing elution technique is overcome to the problem of heavy metal-polluted soil re-activation risk.
Technical solution：A kind of engineering of heavy-metal contaminated soil-agronomy in-situ remediation method, includes the following steps：In weight
It is laid at metallic pollution soil soil depth and horizontally descends hidden pipe and vertical collection seepage pipe；Powdery ridge is carried out to the soil layer of heavy metal pollution
Subsoiling, chesson simultaneously break haftplatte layer；Using Na2The elution of the combination solution of-EDTA and citric acid, is collected using suction unit
Heavy metal leacheate in vertical collection seepage pipe, collects the heavy metal leakage liquid for horizontally descending hidden pipe to flow out；With (NH4)2SO4Again
Washed off soil simultaneously aspirates and collects effusion；It applies maize cob meal and utilizes powder ridge machine by maize cob meal and heavy metal pollution soil layer
Soil blending uniformly, immersions of pouring water, wait infiltrate completely after i.e. completion heavy-metal contaminated soil reparation.
Above-mentioned heavy metal pollution includes at least one of Cd, Pb, Zn, Cu.
Above-mentioned horizontally to descend hidden pipe for PVC double thread pipe with holes, diameter 110mm, double thread Guan Shangkong are distributed in circle,
The quantity in hole is not less than 4 on same circumference, and hole is greater than 3000mm2/ m, buried depth are the soil thickness of heavy metal pollution, the gradient
For 0.6-0.8 ‰, respectively horizontally descends hidden pipe parallelly distribute on and its spacing is 3~8m, horizontally descend and wrap up single layer 50- on the outside of hidden pipe
80g/m2Non-woven filter cloth and 10cm thickness sandstone filtrate；The vertical collection seepage pipe is located at two rows and horizontally descends in hidden pipe
Between, 3~6m of spacing, hard PVC pipe, 3.0~5.0mm of wall thickness, 200~300mm of diameter, 1.6~2.0Mpa of compression strength burying
Enter the side wall punching of vertical collection seepage pipe one end in soil, the length of aperture 2-3mm, pitch of holes 1-2cm, tube wall punching compare buried depth
Small 5cm, upper end 20-40cm above ground level；After vertical collection seepage pipe puncture site wraps up 200 mesh filter screens and gauze, outside is wrapped again
Wrap up in the sandstone filtrate of 10cm thickness.
Above-mentioned powdery ridge subsoiling is to carry out powdery ridge subsoiling using soil layer of the powder ridge machine to heavy metal pollution, and chesson is simultaneously broken
Haftplatte layer, when operation, optimum soil volumetric water content was 20~35Vol.%.
Above-mentioned Na2In the combination solution of-EDTA and citric acid, Na2The molar concentration of-EDTA is 0.05~0.2mol/L,
Na2The molar concentration rate of-EDTA and citric acid is 1:1~3:1, combination solution dosage and heavy metal pollution soil layer in combination solution
The mass ratio of soil is 1:1~3:1.
Above-mentioned (NH4)2SO4Solution ELUTION METHOD is：To Na2Content of beary metal after-EDTA and citric acid combination solution elute
Reach environmental protection standard soil (《Standard of soil environment quality》(GB15618-1995)), with (NH4)2SO4Solution elutes again,
(NH4)2SO4Solution molar concentration is 0.05~0.2mol/L, (NH4)2SO4The mass ratio of solution and washed off soil is 1:1~2:
1.It, can be to Na for the type, content of Heavy Metals in soil and the difference of the soil texture2- EDTA and citric acid it is dense
Degree, proportion, additional amount carry out certain adjustment, when content of beary metal is higher, soil clay particle content is higher, improve Na2-EDTA
It is on the contrary suitably to reduce with the proportion, concentration and dosage of citric acid.
Above-mentioned application maize cob meal is that corn sloughs milled 30 mesh of cob after seed, dosage and heavy metal pollution
The mass ratio of soil is (2~4):1000, after the soil powdery ridge blending uniformly of maize cob meal and heavy metal pollution soil layer, leaching of pouring water
The mass ratio of bubble, irrigation quantity and heavy metal pollution soil layer soil is (0.5~1):1.
The water of above-mentioned immersion of pouring water and the mass ratio of heavy metal pollution soil layer soil are 0.5~1:1, it is no longer taken out after pouring water
Sorptivety leakage, is infiltrated naturally, only passes through underground hidden pipe outlet effusion.
A kind of effusion suction unit, including vertically collect seepage pipe, pipette, PVC drain pipe, horizontally descend hidden pipe, vacuum
Pump and collecting tank, the vertical outer surface for collecting seepage pipe and horizontally descending hidden pipe are equipped with sandstone filter material layer, and the pipette is set to
In vertical collection seepage pipe, the lower end of pipette is flushed with vertical collection seepage pipe bottom, and pipette upper end is connect with PVC drain pipe, PVC row
The outlet end of liquid pipe is connected with the import of vacuum pump, and the outlet of vacuum pump is connect with collecting tank, horizontally descends hidden pipe to be set to vertical
The lower section for collecting seepage pipe, horizontally descends the outlet of hidden pipe to connect with collecting tank.
Above-mentioned pipette is plastic flexible pipe, thickness 1-2mm, 3~6cm of internal diameter.
Above-mentioned PVC drain 3.0~5.0mm of thickness of pipe wall, 150~250mm of diameter, 1.6~2.0Mpa of compression strength, one end are close
Envelope, tube body centre are connected with pipette, and the other end connects vacuum pump.
It is currently preferred method below, specifically comprises the following steps：
(1) the section sample for acquiring contaminated soil 0-1m depth, detects 0-20cm, 20-40cm, 40-60cm, 60-80cm
With the content of beary metal such as 80-100cm P in soil b, Cd, Cr, Hg, Cu, Zn, soil clay particle content, pH, cation exchange capacity (CEC) CEC and
The content of organic matter specifies the type of Main Heavy Metals Pollution, degree and is mainly distributed soil depth.
(2) in the surrounding ridge building of contaminated soil, the high 40-50cm in the ridge, and in surrounding paving plastic film, plastics are thin downwards
Film is laid with depth 1m, separates 0-1m soil layer with Soil Surrounding, prevents leacheate from leaking to periphery.
(3) it to treated in step (2) soil, is laid in the depth 60cm of heavy metal pollution soil layer horizontally lower dark
Pipe, the gradient 0.7 ‰ horizontally descend the spacing 6m (soil texture is loam) of hidden pipe, respectively horizontally descend hidden pipe parallelly distribute on.
(4) it horizontally descends the middle position of hidden pipe to be laid with the vertical collection seepage pipe perpendicular to ground at two, and vacuum is installed
Pumping sorptivety leakage, the vertical spacing 4m for collecting seepage pipe.
(5) to treated in step (4) soil, powdery ridge subsoiling is carried out to 50cm soil layer.
(6) to treated in step (5) soil, with 0.15mol/L Na2- EDTA and 0.15mol/L citric acid are answered
It is eluted with solution, aspirates the heavy metal leacheate penetrated into vertical collection seepage pipe, collected the heavy metal for horizontally descending hidden pipe to flow out and seep
The mass ratio of leakage, leacheate dosage and heavy metal pollution soil layer soil is 2:1.
(7) soil for reaching environmental protection standard to content of beary metal after step (6) processing, with 0.15mol/L (NH4)2SO4It is molten
Liquid elutes again, (NH4)2SO4The mass ratio of solution and soil is 1:1, collect effusion.
(8) maize cob meal of 30 meshes, dosage were spread fertilizer over the fields when its water content is suitable for step (7) treated soil
Mass ratio with heavy-metal contaminated soil is 4:1000, the soil of maize cob meal and heavy metal pollution soil layer is blended with powder ridge machine
Uniformly.
(9) to step (8) treated soil, immersion of pouring water, the mass ratio of irrigation quantity and heavy metal pollution soil layer soil
It is 1:1, it infiltrates naturally, passes through underground hidden pipe outlet effusion.
Beneficial effect：(1) at low cost.In-situ immobilization used in the present invention need to only spread leacheate collection conduit and suction fills
It sets, does not have to large-scale mixing plant and electro reclamation reaction equipment, save operating cost and process is simple, be adapted to large area farmland
The reparation demand of contaminated soil.(2) high-efficient.The present invention seeps chemical leaching in conjunction with powdery ridge subsoiling, while using vertical collection
The rush of pipe seeps design, makes full use of the predominant current principle in irrigation leaching, so that heavy metal leacheate is quickly flowed to Ji Shenguanchu
It is dynamic, and by efficient collected at suction.(3) rate of recovery is high.The Na that the present invention selects2- EDTA and citric acid combination solution are directed to soil
Heavy metal Cd, Pb, Zn, Cu removal effect are good, and leaching loss liquid is collected by collection seepage pipe and the three-dimensional of hidden pipe, time of heavy metal and EDTA
On the other hand high income effectively prevent secondary pollution of the leacheate to underground water.(4) effect stability.The present invention uses corncob
As the biological passivator for remaining heavy metal in soil, maize cob meal humification occurs in the soil for powder, and the humus of generation contains
There are many oxygen-containing functional group, such as carboxyl, phenolic hydroxyl group and alcoholic extract hydroxyl group, heavy metal in in-situ passivation soil enhances repairing effect
And long-acting stabilization.
Detailed description of the invention
Fig. 1 is engineering-agronomy in-situ remediation method flow chart of heavy-metal contaminated soil；
Fig. 2 is engineering-agronomy in-situ remediation system schematic diagram of heavy-metal contaminated soil of the present invention；
Fig. 3 is that heavy metal-polluted soil elutes effusion suction unit schematic diagram；
Fig. 4 is native case leacheate heavy metal Pb, Cd accumulation wash out amount schematic diagram；
Fig. 5 is field leacheate heavy metal Pb, Cd accumulation wash out amount schematic diagram.
1- vertically collects seepage pipe in figure, 2- pipette, 3-PVC drain pipe, and 4- horizontally descends hidden pipe, 5- vacuum pump, 6- liquid collecting
Pond, 7- sandstone filter material layer.
Specific embodiment
Specific embodiment below is to further explanation of the invention, and it is not intended that the contents of the present invention are only limitted to be lifted
The range of example.
Embodiment 1：Native case engineering-agronomy repairs cadmium lead combined pollution Sulfur fractions
A kind of effusion suction unit, including vertically collect seepage pipe 1, pipette 2, PVC drain pipe 3, horizontally descend hidden pipe 4,
Vacuum pump 5 and collecting tank 6, the vertical outer surface for collecting seepage pipe 1 and horizontally descending hidden pipe 4 are equipped with sandstone filter material layer 7, the suction
Liquid pipe 2 is set in vertical collection seepage pipe 1, and the lower end of pipette is flushed with vertical collection seepage pipe bottom, pipette upper end and PVC drain pipe
3 connections, the outlet end of PVC drain pipe 3 are connected with the import of vacuum pump 5, and the outlet of vacuum pump 5 is connect with collecting tank 6, horizontally
Lower hidden pipe 4 is set to the lower section of vertical collection seepage pipe 1, and the outlet of hidden pipe 4 is horizontally descended to connect with collecting tank 6.Above-mentioned pipette is modeling
Expect hose, thickness 1-2mm, 3~6cm of internal diameter.Above-mentioned PVC drain 3.0~5.0mm of thickness of pipe wall, 150~250mm of diameter, pressure resistance
1.6~2.0Mpa, one end sealing are spent, tube body centre is connected with pipette, and the other end connects vacuum pump.It is above-mentioned horizontally to descend hidden pipe
For PVC double thread pipe with holes, diameter 110mm, double thread Guan Shangkong are distributed in circle, and the quantity in hole is not less than on same circumference
4, hole is greater than 3000mm2/ m, buried depth are the soil thickness of heavy metal pollution, and the gradient is 0.6-0.8 ‰, horizontally descend hidden pipe
Wrap up single layer 50-80g/m in outside2Non-woven filter cloth and 10cm thickness sandstone filtrate；The vertical collection seepage pipe is located at two rows
Horizontally descend the centre of hidden pipe, hard PVC pipe, 3.0~5.0mm of wall thickness, 200~300mm of diameter, compression strength 1.6~
2.0Mpa, the side wall punching of vertical collection seepage pipe one end in placing into the soil, aperture 2-3mm, pitch of holes 1-2cm, tube wall punching
Length it is 5cm smaller than buried depth, upper end 20-40cm above ground level；Vertical collection seepage pipe puncture site wraps up 200 mesh filter screens and gauze
Afterwards, the sandstone filtrate of 10cm thickness is wrapped up in outside again.
Specifically, certain coastal displaced plant's sewage draining exit heavy-metal contaminated soil of Jiangsu Province's Yancheng City, takes surface layer 10cm soil
Layer soil 100kg.It air-dries, after milled 10 mesh, is fitted into the PVC cuboid box of long 30cm, width 40cm, high 1m, appearance of banketing
Weight 1.4g/cm3, the sand of lower layer's place mat 20cm thickness, horizontally embedded one of middle position horizontally descends hidden pipe, it is described horizontally
Lower hidden pipe is the PVC double thread pipe with holes of diameter 8cm, and soil height 40cm (uses soil 67.2kg), it is vertical to bury a diameter 8cm
Collect seepage pipe, the sandstone filtrate of 200 mesh filter screen of outsourcing, gauze and 6cm thickness.Draw the 0.1mol/L Na of 144L2- EDTA and
The combination solution (dividing 3 times, each 48L, be equivalent to PVC cuboid box 40cm height water layer) of 0.1mol/L citric acid, from top
It is added, the leacheate of bottom collection double thread pipe, the leacheate of vertical collection seepage pipe is aspirated on top, (divides 3 after elution every time
It is secondary), respectively to 0-20cm, 20-40cm soil layer sampling determination Pb, Cd full dose content in native case, measure leacheate volume and Pb,
Cd concentration.After elution, the 0.2mol/L (NH of 72L is drawn4)2SO4Solution be added from top (points 2 times, each 36L, quite
In PVC cuboid box 30cm height water layer), leacheate is collected, after elution, acquires 0-20cm, 20- in PVC cuboid box
40cm soil sample measures soil sample using BCR sequential extractions and inductively coupled plasma atomic emission spectrometry (ICP-AES)
Middle sour solvent (EX), can reduction-state (OXI), oxidable state (ORG) and residual form (RES) content.To soil in PVC cuboid box
After air-drying, all soil in PVC cuboid box are taken out, the maize cob meal that 260g crosses 30 meshes is added after crushing, is blended with soil
PVC cuboid box is filled into as required again after uniformly, 48L distilled water is added from top, no longer suction leacheate, is infiltrated naturally
And drenched out by hidden pipe, after elution again sour solvent (EX) in sampling determination 0-20cm, 20-40cm soil sample, can reduction-state
(OXI), Pb, Cd content of oxidable state (ORG) and residual form (RES).
By Na2The combination solution of-EDTA and citric acid elution after, 0-20cm and 20-40cm P in soil b full dose content by
168.84mg/kg is down to 32.16mg/kg and 54.73mg/kg respectively, and Cd full dose content is down to respectively by 2.24mg/kg
The removal rate of 0.36mg/kg and 0.51mg/kg, full dose Pb are 74.27%, and the removal rate of full dose Cd is 80.58%.(NH4)2SO4
After elution, 0-20cm soil sour solvent (EX), can reduction-state (OXI), oxidable state (ORG) and residual form (RES) Pb
Content is respectively 5.05mg/kg, 19.23mg/kg, 4.64mg/kg and 1.67mg/kg, after maize cob meal elution is added, each form
Content is respectively 4.96mg/kg, 1.55mg/kg, 1.63mg/kg and 23.37mg/kg.(NH4)2SO4After elution, 0-20cm
Soil sour solvent (EX), can the Cd content of reduction-state (OXI), oxidable state (ORG) and residual form (RES) be respectively 0.047mg/
Kg, 0.012mg/kg, 0.249mg/kg and 0.062mg/kg, after maize cob meal elution is added, each form content is respectively
0.075mg/kg, 0.063mg/kg, 0.015mg/kg and 0.193mg/kg.It, can reduction-state Pb and can oxygen after maize cob meal elution
Change state Cd to be greatly reduced, residual form Pb, Cd content is significantly increased, and maize cob meal acts on the active passivation of heavy metal significant.
The native case Na of table 12The effect of-EDTA and citric acid combination solution elution heavy metal
The content of the native case maize cob meal elution of table 2 front and back heavy metal-polluted soil different shape
Embodiment 2：Irrigation facility-agronomy in-situ immobilization cadmium lead combined pollution Sulfur fractions
A kind of effusion suction unit, including vertically collect seepage pipe 1, pipette 2, PVC drain pipe 3, horizontally descend hidden pipe 4,
Vacuum pump 5 and collecting tank 6, the vertical outer surface for collecting seepage pipe 1 and horizontally descending hidden pipe 4 are equipped with sandstone filter material layer 7, the suction
Liquid pipe 2 is set in vertical collection seepage pipe 1, and the lower end of pipette is flushed with vertical collection seepage pipe bottom, pipette upper end and PVC drain pipe
3 connections, the outlet end of PVC drain pipe 3 are connected with the import of vacuum pump 5, and the outlet of vacuum pump 5 is connect with collecting tank 6, horizontally
Lower hidden pipe 4 is set to the lower section of vertical collection seepage pipe 1, and the outlet of hidden pipe 4 is horizontally descended to connect with collecting tank 6.Above-mentioned pipette is modeling
Expect hose, thickness 1-2mm, 3~6cm of internal diameter.Above-mentioned PVC drain 3.0~5.0mm of thickness of pipe wall, 150~250mm of diameter, pressure resistance
1.6~2.0Mpa, one end sealing are spent, tube body centre is connected with pipette, and the other end connects vacuum pump.It is above-mentioned horizontally to descend hidden pipe
For PVC double thread pipe with holes, diameter 110mm, double thread Guan Shangkong are distributed in circle, and the quantity in hole is not less than on same circumference
4, hole is greater than 3000mm2/ m, buried depth are the soil thickness of heavy metal pollution, and the gradient is 0.6-0.8 ‰, horizontally descend hidden pipe
Wrap up single layer 50-80g/m in outside2Non-woven filter cloth and 10cm thickness sandstone filtrate；The vertical collection seepage pipe is located at two rows
Horizontally descend the centre of hidden pipe, hard PVC pipe, 3.0~5.0mm of wall thickness, 200~300mm of diameter, compression strength 1.6~
2.0Mpa, the side wall punching of vertical collection seepage pipe one end in placing into the soil, aperture 2-3mm, pitch of holes 1-2cm, tube wall punching
Length it is 5cm smaller than buried depth, upper end 20-40cm above ground level；Vertical collection seepage pipe puncture site wraps up 200 mesh filter screens and gauze
Afterwards, the sandstone filtrate of 10cm thickness is wrapped up in outside again.
Specifically, certain coastal displaced plant's sewage draining exit heavy-metal contaminated soil of Jiangsu Province's Yancheng City, chooses 400m2Pollution compared with
Serious plot (20m × 20m), in surrounding ridge building, the high 50cm in the ridge, and in surrounding paving plastic film downwards, plastic film
It is laid with depth 1m, prevents leacheate from leaking to periphery.In underground, hidden pipe is horizontally descended in the laying of 40cm depth, horizontally descends hidden pipe
Spacing 5m (soil texture is loam), be laid with 4 parallelly distribute ons altogether horizontally descends hidden pipe.With vertical powder ridge machine to pollution plot
Powdery ridge subsoiling 40cm is carried out, then horizontally descends the middle position of hidden pipe to be laid with 12 vertical collection perpendicular to ground at 4 and seeps
It manages (3 rows, every row 4), and vacuum pump is installed, the vertical spacing 5m for collecting seepage pipe.With preparation 0.2mol/L Na in liquid pool2-
The combination solution of EDTA and 0.2mol/L citric acid prepares combination solution 320m altogether3, it is divided into liquid feeding twice, each 160m3, with stream
Amount is 6m3The acid-proof pump of/h extracts combination solution from top liquid feeding, from bottom collection effusion, measures Pb, Cd in effusion and contains
Amount.Every time after elution, sampling determination 0-20cm, 20-40cm soil layer Pb, Cd heavy metal full dose content and DTPA-TEA are extracted
Bio-available Zn concentration, each soil sample acquire 5 samples by blossom type sampling method and mix.After the completion of eluting twice, 0-20cm soil
Pb, Cd full dose content are down to 23.17mg/kg and 0.35mg/kg by 116.54mg/kg, 1.87mg/kg respectively, and DTPA-TEA has
It imitates state Pb, Cd content and 1.33mg/kg and 0.22mg/kg is down to by 4.56mg/kg, 0.48mg/kg respectively；20-40cm P in soil b,
Cd full dose content is down to 27.44mg/kg and 0.39mg/kg, DTPA-TEA available state by 88.74mg/kg, 1.51mg/kg respectively
Pb, Cd content are down to 1.27mg/kg and 0.19mg/kg by 3.89mg/kg, 0.43mg/kg respectively；0-40cm soil total Pb,
The removal rate of Cd respectively reaches 75.35% and 76.92%, and the removal rate of DTPA-TEA available state Pb, Cd are respectively 69.23% and
65.93%.
240m is added with pump30.2mol/L (NH4)2SO4Solution elutes again, wait elute complete soil fall it is dry after, earth's surface
The soil of maize cob meal and 40cm soil layer is blended uniformly with powder ridge machine, is poured water by the maize cob meal for spreading fertilizer over the fields 30 mesh of mistake of 850kg
200m3, elution, after with the same method of sampling acquire 0-20cm and 20-40cm pedotheque, and measure Pb, Cd with much money
Belong to full dose content and DTPA-TEA extracts bio-available Zn concentration.After the completion of reparation, 0-20cm P in soil b, Cd full dose content by
23.17mg/kg, 0.35mg/kg are down to 22.86mg/kg and 0.33mg/kg respectively, DTPA-TEA available state Pb, Cd content by
1.33mg/kg, 0.22mg/kg are down to 0.76mg/kg and 0.13mg/kg respectively；20-40cm P in soil b, Cd full dose content by
27.44mg/kg, 0.39mg/kg are down to 27.18mg/kg and 0.38mg/kg respectively, DTPA-TEA available state Pb, Cd content by
1.27mg/kg, 0.19mg/kg are down to 0.67mg/kg and 0.11mg/kg respectively；0-40cm P in soil b, Cd full dose content is smaller,
The removal rate of DTPA-TEA available state Pb, Cd are respectively 45.0% and 41.46%, the biologically effective of 0-40cm heavy metal-polluted soil Pb
Property coefficient (DTPA-TEA bio-available Zn concentration/full dose content, %) is reduced to the biologically effective property coefficient of 2.86, Cd by 55.4 by 5.13
It is reduced to 33.80.
3 field Na of table2The effect of-EDTA and citric acid combination solution elution heavy metal full dose
4 field Na of table2The effect of-EDTA and citric acid combination solution elution heavy metal DTPA-TEA bio-available Zn concentration
5 field corn core powder of table elution front and back heavy metal-polluted soil full dose, DTPA-TEA bio-available Zn concentration and biological effectiveness
Coefficient
Claims (9)
1. a kind of engineering of heavy-metal contaminated soil-agronomy in-situ remediation method, it is characterised in that include the following steps：In a huge sum of money
Belong to and is laid with horizontally to descend hidden pipe and vertical collection seepage pipe at contaminated soil soil depth；It is deep that powdery ridge is carried out to the soil layer of heavy metal pollution
Pine, chesson simultaneously break haftplatte layer；Using Na2The elution of the combination solution of-EDTA and citric acid, is collected using suction unit and is hung down
Heavy metal leacheate in straight collection seepage pipe, collects the heavy metal leakage liquid for horizontally descending hidden pipe to flow out；With (NH4)2SO4It drenches again
It washes soil and aspirates and collect effusion；It applies maize cob meal and utilizes powder ridge machine by maize cob meal and heavy metal pollution soil layer
Uniformly, heavy-metal contaminated soil reparation is completed in immersion of pouring water after infiltrating completely for soil blending.
2. the engineering of heavy-metal contaminated soil-agronomy in-situ remediation method according to claim 1, it is characterised in that the water
Hidden pipe is PVC double thread pipe with holes under level land, and diameter 110 mm, double thread Guan Shangkong are distributed in circle, hole on same circumference
Quantity be not less than 4, hole be greater than 3000 mm2/ m, buried depth are the soil thickness of heavy metal pollution, gradient 0.6-
0.8 ‰, it respectively horizontally descends hidden pipe parallelly distribute on and its spacing is 3 ~ 8 m, horizontally descend and wrap up single layer 50-80 g/ on the outside of hidden pipe
m2Non-woven filter cloth and 10 cm thickness sandstone filtrate；The vertical collection seepage pipe is located at the centre that two rows horizontally descend hidden pipe,
3 ~ 6 m of spacing, hard PVC pipe, 3.0 ~ 5.0 mm of wall thickness, 200 ~ 300 mm of diameter, 1.6 ~ 2.0 Mpa of compression strength are being embedded to
The side wall of vertical collection seepage pipe one end in soil punches, aperture 2-3 mm, pitch of holes 1-2 cm, and the length of tube wall punching compares buried depth
Small 5 cm, upper end 20-40 cm above ground level；After vertical collection seepage pipe puncture site wraps up 200 mesh filter screens and gauze, outside is again
Wrap up the sandstone filtrate of 10 cm thickness.
3. the engineering of heavy-metal contaminated soil-agronomy in-situ remediation method according to claim 1, it is characterised in that the powder
Ridge subsoiling is to carry out powdery ridge subsoiling using soil layer of the powder ridge machine to heavy metal pollution, and chesson simultaneously breaks haftplatte layer, operation
When optimum soil volumetric water content be 20 ~ 35 Vol .%.
4. the engineering of heavy-metal contaminated soil-agronomy in-situ remediation method according to claim 1, it is characterised in that described
Na2In the combination solution of-EDTA and citric acid, Na2The molar concentration of-EDTA is 0.05 ~ 0.2 mol/L, Na2- EDTA and lemon
The molar concentration rate of acid is 1:1~3:1, combination solution dosage and the mass ratio of heavy metal pollution soil layer soil are in combination solution
1:1~3:1。
5. the engineering of heavy-metal contaminated soil-agronomy in-situ remediation method according to claim 1, it is characterised in that described
(NH4)2SO4Solution ELUTION METHOD is：To Na2Content of beary metal reaches environmental protection standard after-EDTA and citric acid combination solution elute
Soil, with (NH4)2SO4Solution elutes again, (NH4)2SO4Solution molar concentration is 0.05 ~ 0.2 mol/L, (NH4)2SO4It is molten
The mass ratio of liquid and washed off soil is 1:1~2:1.
6. the engineering of heavy-metal contaminated soil-agronomy in-situ remediation method according to claim 1, it is characterised in that described to apply
With milled 30 mesh of cob that maize cob meal is after corn sloughs seed, the mass ratio of dosage and heavy-metal contaminated soil is
（2~4）:1000, after the soil powdery ridge blending uniformly of maize cob meal and heavy metal pollution soil layer, immersions of pouring water, irrigation quantity with much money
Belong to pollution soil layer soil mass ratio be（0.5~1）:1.
7. one kind is for implementing the effusion suction unit of any the method for claim 1 ~ 6, it is characterised in that：Including hanging down
Straight collection seepage pipe（1）, pipette（2）, PVC drain pipe（3）, horizontally descend hidden pipe（4）, vacuum pump（5）And collecting tank（6）, described
Vertical collection seepage pipe（1）Horizontally descend hidden pipe（4）Outer surface be equipped with sandstone filter material layer（7）, the pipette（2）Set on vertical
Collect seepage pipe（1）Interior, the lower end of pipette is flushed with vertical collection seepage pipe bottom, pipette upper end and PVC drain pipe（3）Connection, PVC
Drain pipe（3）Outlet end and vacuum pump（5）Import be connected, vacuum pump（5）Outlet and collecting tank（6）Connection, horizontally
Lower hidden pipe（4）Set on vertical collection seepage pipe（1）Lower section, horizontally descend hidden pipe（4）Outlet and collecting tank（6）Connection.
8. effusion suction unit according to claim 7, it is characterised in that the pipette is plastic flexible pipe, thickness 1-2
Mm, 3 ~ 6 cm of internal diameter.
9. effusion suction unit according to claim 7, it is characterised in that 3.0 ~ 5.0 mm of PVC drain thickness of pipe wall,
150 ~ 250 mm of diameter, 1.6 ~ 2.0 Mpa of compression strength, one end sealing, tube body centre are connected with pipette, and other end connection is true
Sky pump.
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| CN112517626A (en) * | 2019-09-17 | 2021-03-19 | 吕正雄 | Method and device for quickly repairing saline-alkali soil and heavy metal contaminated soil |
| CN112958619A (en) * | 2021-02-02 | 2021-06-15 | 辽宁工程技术大学 | Fermentation chemical remediation method and device for heavy metal polluted underground water |
| CN115193902A (en) * | 2022-05-12 | 2022-10-18 | 厦门海洋职业技术学院 | Treatment method for heavy metal polluted farmland |
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| CN108817050B (en) | 2020-08-04 |
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