CN109226223A - A kind of heavy-metal contaminated soil in-situ immobilization technique - Google Patents
A kind of heavy-metal contaminated soil in-situ immobilization technique Download PDFInfo
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- CN109226223A CN109226223A CN201811212952.4A CN201811212952A CN109226223A CN 109226223 A CN109226223 A CN 109226223A CN 201811212952 A CN201811212952 A CN 201811212952A CN 109226223 A CN109226223 A CN 109226223A
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- 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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A kind of heavy-metal contaminated soil in-situ immobilization technique, comprising the following steps: pollution depth is determined compared with national standard by heavy metal concentration distribution situation in measurement contaminated soil section, upper layer contaminated soil is dug out, lower soil is reserved；The gradient is arranged in lower soil, gutter is arranged on gradient leg wire of slope, gutter is connected to collecting-tank；Lower soil upper surface is laid with antiseepage film, the contaminated soil dug out is backfilling into antiseepage film, keeps the gradient consistent with lower soil after backfill；It spreads fertilizer over the fields heavy metal solubility renovation agent and pours water, or pour water soluble renovation agent is soluble in water, the heavy metal seepage flow of leaching is pooled to gutter；Content of beary metal detection is carried out to backfill soil, reaches standard and then repairs completion, not up to standard, which then recycles, spreads fertilizer over the fields heavy metal solubility renovation agent to standard is reached, and repairs and completes.The present invention is not required to special prosthetic appliance, it is only necessary to irrigate equipment；It may be selected to spread fertilizer over the fields and pour the modes such as apply, flexible operation according to place feature.Compared with other treatment process, cost is substantially reduced.
Description
Technical field
The invention belongs to heavy metal pollution of soil to repair field, in situ in particular to a kind of heavy-metal contaminated soil
Renovation technique.
Background technique
With the promulgation of country's " ten, soil ", remediation contaminated soil becomes the important content in environmental pollution prevention and control field.?
In Soil Pollution Control, Heavy Metal Pollution is the work that covering surface is most wide, task is most heavy, difficulty is maximum, investment is most
Make.In this work, heavy metal pollution renovation technique technology is the key that determine its implementation result.Currently, to heavy metal-polluted
The method of dye site remediation mainly has steadyization/solidification, chemical leaching, air lift, oxidation etc. several, and steadyization/solidification is using organic
Heavy metal adsorption in soil particle surface, is reduced its bioavailability, chemical leaching by absorption, chelating effect by renovation agent
Refer to and contaminated soil is subjected to showering using eluent, air lift is that heavy metal is gasified from Polluted Soil using thermal desorption method
Earth is separated, and oxidation is to lead to the method for oxygen by high temperature heavy metal oxidation is changed its valence state to reduce the side of its toxicity
Method.Above-mentioned several technical method air lift method consuming energies and to the following heavy metal pollution of soil in surface layer repair it is undesirable, steadyization/
Although curing technology can reduce the bioavailability of heavy metal in soil, but heavy metal still stops in the soil, passes through
The effect of a period of time and environment, bioavailability still can reduce, and therefore, this method cannot play effectiveness for a long time, remove
Non-periodically applies renovation agent, and such cost can greatly improve, and therefore, belongs to a kind of unsustainable technique, chemical leaching is current
Contaminated soil is dug out mostly and is transported to the dystopy processing that processing vehicle insurance carries out, this technique still may be used also to processing a small range of pollution
With, for large-scale pollution, it is extremely huge engineering that soil, which is dug out, is transported, is stored, is handled, be it is infeasible, at oxidation
Reason is on the one hand similar with steadyization/solidification, reversible reaction can occur under long-range circumstances effect, therefore this technology is also that can not hold
Continuous.To sum up, sustainable technology is lacked at present for the reparation in a wide range of heavy metal pollution place.
Summary of the invention
To overcome above-mentioned technical problem, the present invention provides a kind of heavy-metal contaminated soil in-situ immobilization technique, and the present invention is
A kind of renovation technique for being particularly suitable for a wide range of heavy metal pollution place of sustainability, to solve current heavy metal pollution field
Ground repair small scale or it is unsustainable the problems such as.
The object of the present invention is achieved in the following manner:
A kind of heavy-metal contaminated soil in-situ immobilization technique, comprising the following steps:
A. pollution depth is determined compared with national standard by heavy metal concentration distribution situation in measurement contaminated soil section, it will
Upper layer contaminated soil is dug out, and reserves lower soil；
B. the 1%-2% gradient is arranged in lower soil, and gutter is arranged on gradient leg wire of slope, and the gutter gradient is 3%-5%, gutter
It is connected to collecting-tank；
C. lower soil upper surface is laid with antiseepage film, then the contaminated soil dug out in a step is backfilling into antiseepage film, returned
Keep the gradient consistent with lower soil after filling out；
D. it spreads fertilizer over the fields heavy metal solubility renovation agent and pours water, or pour water soluble renovation agent is soluble in water, leaching
Heavy metal seepage flow is pooled to gutter；
E. content of beary metal detection is carried out to backfill soil, reaches standard and then repairs completion, not up to then circulation step d is extremely for standard
Reach standard, repairs and complete.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, the cross sectional shape in the gutter the step b be it is U-shaped, trapezoidal or
Rectangle, trapezoidal short bottom edge are located at the bottom in gutter.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, the volume of the step b collecting-tank are greater than the 1.5 of irrigation quantity
Times.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, the step c remove the one side in gutter in backfill surrounding,
He is respectively provided with barricade in three faces.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, heavy metal solubility renovation agent is water-soluble in the step d
Chitosan, EDTA, HEDTA, NTA, EGTA, EDDHA, CDTA, ethyl alcohol, citric acid, malic acid, malonic acid, acetic acid, in histidine
Any or at least two mixtures.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, the step b repair cellar area and are less than 3000m2When, row
The width and height in ditch are 0.25m -0.5m.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, the step b repair cellar area and are greater than 3000m2When, row
The width and height in ditch are 0.5m -1.5m.
Above-mentioned heavy-metal contaminated soil in-situ immobilization technique, collecting-tank 1m above ground level in the step b.
By adopting the above technical scheme, the present invention has the following advantages:
It is not required to special prosthetic appliance, it is only necessary to irrigate equipment；It may be selected to spread fertilizer over the fields and pour the modes such as apply, behaviour according to place feature
Make flexible；In operation, complicated process is not needed, need to only be poured water, uses automatic irrigation system if possible, then
Simpler convenience is operated, administrative staff only need simple training can upper hand；Without freights and the warehousing charge such as transporting, storing
With a small amount of electric energy only need to be consumed, compared with other treatment process, cost is substantially reduced without large-scale energy consumption equipment.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
The basic principle of heavy-metal contaminated soil in-situ immobilization technique of the invention is:
It is acted on by the lower infiltration of irrigation water, the heavy metal in heavy metal solubility renovation agent and soil is made to come into full contact with simultaneously leaching,
In lower layer, antiseepage film is set, avoidable leacheate, which is infiltrated into deep soil, leads to secondary pollution, meanwhile, it can be in order to leacheate
It collects, lower soil setting certain slope is to be in leg wire of slope setting gutter in order to which just also leacheate is pooled to a direction
In order to make leacheate converge and enter in collecting-tank, it is to prevent and treat leacheate that setting, which is covered with the barricade of antiseepage film, around place
Seepage flow goes out other than the unit of place, and therefore, the water flow seepage flow of Soil Moisture Dynamics, confluence principle is mainly utilized in the above process；Separately
Outside, the leaching of heavy metal solubility renovation agent is that absorption, chelating, complexing occurs using soluble component and heavy metal
It makes it dissolve in water, and with water leaching.
A kind of heavy-metal contaminated soil in-situ immobilization technique, comprising the following steps:
A. pollution depth is determined compared with national standard by heavy metal concentration distribution situation in measurement contaminated soil section, it will
Upper layer contaminated soil is dug out, and reserves lower soil；
B. the 1%-2% gradient is arranged in lower soil, gutter is arranged on gradient leg wire of slope, it is to make that the gradient, which is arranged, in lower soil
The heavy metal seepage flow of leaching is pooled in gutter, and the gutter gradient is 3%-5%, the cross sectional shape in gutter be it is U-shaped, trapezoidal or
Rectangle, trapezoidal short bottom edge are located at the bottom in gutter, and gutter is connected to collecting-tank, and it is to drain that the gradient, which is arranged, in gutter
Water in ditch enters in the collecting-tank of next step, and the volume of collecting-tank is greater than 1.5 times of irrigation quantity, and collecting-tank is above ground level
1m prevents precipitation other than collecting-tank overflow and reparation area from collecting into collecting-tank.
It is less than 3000m when repairing cellar area2When, the width and height in gutter are 0.25m -0.5m, single when repairing
Elemental area is greater than 3000m2When, the width and height in gutter are 0.5m -1.5m；
C. lower soil upper surface is laid with antiseepage film, it is therefore an objective to prevent leaching liquor from entering to be seeped into lower soil, avoid to subsoil
Earth pollution, meanwhile, leaching liquor is collected convenient for gutter, then the contaminated soil dug out in a step is backfilling into antiseepage film, is returned
It keeps the gradient consistent with lower soil after filling out, removes the one side in gutter in backfill surrounding, other three faces are respectively provided with barricade；
D. it spreads fertilizer over the fields heavy metal solubility renovation agent and pours water, or pour water soluble renovation agent is soluble in water, leaching
Heavy metal seepage flow is pooled to gutter, the heavy metal solubility renovation agent be water soluble chitosan, EDTA, HEDTA, NTA,
Any one of EGTA, EDDHA, CDTA, ethyl alcohol, citric acid, malic acid, malonic acid, acetic acid, histidine or at least two mixing
Object；
E. content of beary metal detection is carried out to backfill soil, reaches standard and then repairs completion, not up to then circulation step d is extremely for standard
Reach standard, repairs and complete.
Embodiments of the present invention are illustrated below with reference to Fig. 1.
The first step, according to contaminated site Investigation of Heavy Metals evaluation result determine pollution range (area and depth),
Such as without research and appraisal as a result, sampling can be laid in the horizontal and vertical directions according to contaminated site soil sampling related specifications
Soil sample is put and acquires, in conjunction with the land quality requirement of China's " standard of soil environment quality " (by latest edition) and plot to be processed,
Place heavy metal pollution range (area and depth) is selected.
Second step digs out contaminated soil according to the pollution range of above-mentioned determination, and is stacked in regulation place, under set up defences
Seep bedding, rain covering methods of above setting up defences.
Third step, using bull-dozer etc. it is mechanical the plot for having cut out contaminated soil i.e. lower soil pushed into 1% ~ 2% slope
Gradient direction, under normal circumstances, is preferably set on the shorter side in plot, to reduce seepage paths, accelerates the discharge of leaching liquor by degree,
Barricade is set up in leg wire of slope Vertical Square simultaneously, is prevented soil loss.
4th step excavates gutter along the leg wire of slope direction of the above-mentioned gradient, and the gradient in gutter can be used 3% ~ 5%, draining
The section of ditch may be configured as U-shaped, trapezoidal or rectangle, such as be set as trapezoidal, then elemental area is being repaired in the bottom surface in gutter in short bottom edge
When product is less than 3000m2,0.25m ~ 0.5m is can be used in the width and height in gutter, when reparation cellar area is greater than 3000m2,
0.5m ~ 1.5m can be used in the width and height in gutter, excavates collecting-tank in the end in gutter, the volume of collecting-tank is not less than
1.5 times of irrigation quantity, gutter and collecting-tank are all made of concrete structure, are laid with antiseepage film, collecting-tank height 1m above ground level,
Prevent precipitation other than collecting-tank overflow and reparation area from collecting into collecting-tank.
5th step, setting antiseepage film on the above-mentioned place for pushing into certain slope i.e. lower soil upper berth, (antiseepage film preferably uses anti-
Seep the material that performance is good, durability is good), then, by the contaminated soil dug out in the first step in landfill to the place, first with small
Mound is substantially bulldozed by type bull-dozer, then, is digged and smashed large clod with the farm tractor with rotary cultivator, then use
Tractor with rake flattens plot, later, the concrete guard wall of about 30cm above ground level is arranged in surrounding, vehicle marches into the arena place can
Pad soil or laying concrete form certain slope outward, in order to which Construction traffic is marched into the arena.
6th step, can be soluble by heavy metal using the implanted device on tractor when raking the soil level in the 5th step
Renovation agent, which is broadcast, to be applied in soil, can also be spread fertilizer over the fields, can also filled on tractor by worker station in tractor traveling
Heavy metal solubility renovation agent is dissolved into water application with irrigation water to field when irrigating.
7th step should be implemented to irrigate as early as possible after heavy metal solubility renovation agent is manured into soil, and irrigation method can use
Flood irrigation, sprinkling irrigation or pipeline irrigation, irrigation quantity is can largely leachings be discharged as control condition.
8th step measures the content of heavy metal in soil when no longer generating water flow in gutter, such as exceeds permissible value,
Then continue to implement elution.
Above-mentioned steps one to step 5 should carry out in non-flood period as far as possible, to avoid pollution soil stockpiling as far as possible by rainfall
It influences to generate pollution of area source.
The leaching liquor collected in above-mentioned collecting-tank can be by fixed-end forces center specially after being handled by evaporation and concentration
Reason.
Above steps be the molten optional water soluble chitosan of heavy metal solubility renovation agent, EDTA, HEDTA, NTA,
Any one of EGTA, EDDHA, CDTA, ethyl alcohol, citric acid, malic acid, malonic acid, acetic acid, histidine or at least two mixing
Object.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art,
Without depart from that overall concept of the invention, several changes and improvements can also be made, these also should be considered as of the invention
Protection scope, these all will not influence the effect and patent practicability that the present invention is implemented.
Claims (8)
1. a kind of heavy-metal contaminated soil in-situ immobilization technique, it is characterised in that: the following steps are included:
A. pollution depth is determined compared with national standard by heavy metal concentration distribution situation in measurement contaminated soil section, it will
Upper layer contaminated soil is dug out, and reserves lower soil；
B. the 1%-2% gradient is arranged in lower soil, and gutter is arranged on gradient leg wire of slope, and the gutter gradient is 3%-5%, gutter
It is connected to collecting-tank；
C. lower soil upper surface is laid with antiseepage film, then the contaminated soil dug out in a step is backfilling into antiseepage film, returned
Keep the gradient consistent with lower soil after filling out；
D. it spreads fertilizer over the fields heavy metal solubility renovation agent and pours water, or pour water soluble renovation agent is soluble in water, leaching
Heavy metal seepage flow is pooled to gutter；
E. content of beary metal detection is carried out to backfill soil, reaches standard and then repairs completion, not up to then circulation step d is extremely for standard
Reach standard, repairs and complete.
2. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: the step b draining
The cross sectional shape of ditch is U-shaped, trapezoidal or rectangle, and trapezoidal short bottom edge is located at the bottom in gutter.
3. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: the step b catchments
The volume in pond is greater than 1.5 times of irrigation quantity.
4. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: the step c is being returned
Surrounding of banketing removes the one side in gutter, other three faces are respectively provided with barricade.
5. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: weight in the step d
Metal solubility renovation agent is water soluble chitosan, EDTA, HEDTA, NTA, EGTA, EDDHA, CDTA, ethyl alcohol, citric acid, apple
Any one of tartaric acid, malonic acid, acetic acid, histidine or at least two mixtures.
6. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: the step b is repaired
Cellar area is less than 3000m2When, the width and height in gutter are 0.25m -0.5m.
7. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: the step b is repaired
Cellar area is greater than 3000m2When, the width and height in gutter are 0.5m -1.5m.
8. heavy-metal contaminated soil in-situ immobilization technique according to claim 1, it is characterised in that: collect in the step b
Pond 1m above ground level.
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| CN201811212952.4A CN109226223A (en) | 2018-10-18 | 2018-10-18 | A kind of heavy-metal contaminated soil in-situ immobilization technique |
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| CN201811212952.4A CN109226223A (en) | 2018-10-18 | 2018-10-18 | A kind of heavy-metal contaminated soil in-situ immobilization technique |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109675919A (en) * | 2019-01-24 | 2019-04-26 | 圣清环保股份有限公司 | A kind of preparation and elution engineering practice method in situ of heavy metal pollution of soil leacheate |
| CN111501791A (en) * | 2020-04-29 | 2020-08-07 | 尤宝旺 | Slope surface treatment method for mine refuse dump |
| CN112058885A (en) * | 2020-09-04 | 2020-12-11 | 钟德仁 | Novel soil pollution control method |
| CN113680809A (en) * | 2021-08-16 | 2021-11-23 | 江苏隆昌化工有限公司 | Heavy metal polluted farmland hyperstable mineralized soil restoration material and application method thereof |
| CN113770166A (en) * | 2021-09-28 | 2021-12-10 | 中国科学院遗传与发育生物学研究所农业资源研究中心 | Chemical leaching remediation method for heavy metal contaminated soil |
| CN115193901A (en) * | 2022-08-15 | 2022-10-18 | 青岛冠中环境技术有限公司 | Treatment method for heavy metal polluted saline-alkali soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109675919A (en) * | 2019-01-24 | 2019-04-26 | 圣清环保股份有限公司 | A kind of preparation and elution engineering practice method in situ of heavy metal pollution of soil leacheate |
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| CN113680809A (en) * | 2021-08-16 | 2021-11-23 | 江苏隆昌化工有限公司 | Heavy metal polluted farmland hyperstable mineralized soil restoration material and application method thereof |
| CN113770166A (en) * | 2021-09-28 | 2021-12-10 | 中国科学院遗传与发育生物学研究所农业资源研究中心 | Chemical leaching remediation method for heavy metal contaminated soil |
| CN115193901A (en) * | 2022-08-15 | 2022-10-18 | 青岛冠中环境技术有限公司 | Treatment method for heavy metal polluted saline-alkali soil |
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