CN108927404A - A kind of soil layering restorative procedure - Google Patents
A kind of soil layering restorative procedure Download PDFInfo
- Publication number
- CN108927404A CN108927404A CN201810654547.1A CN201810654547A CN108927404A CN 108927404 A CN108927404 A CN 108927404A CN 201810654547 A CN201810654547 A CN 201810654547A CN 108927404 A CN108927404 A CN 108927404A
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- soil
- contaminated soil
- reparation
- pond
- kaolin
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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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
Abstract
The invention discloses soil, light contaminated soil, pollution-free soil, one piece of reparation pond is dug out in Polluted area, repairs a kind of soil layering restorative procedure in pond, specifically includes the following steps: S1, carrying out on-site inspection to contaminated soil；S2, contaminated soil is divided into three layers, is followed successively by heavily contaminated from top to bottom and spreads one layer of impervious barrier, then chemical remediation device is put into and is repaired in pond, the heavily contaminated soil of the former heavily contaminated soil repaired in pond and contaminated area is dug into concentration investment and is repaired in pond；S3, it is placed with reparation cylinder on one side in reparation pond, it repairs in cylinder and is contained with reparation liquid, it is connected by transfer tube and repairs cylinder and chemical remediation device, high-pressure pump is equipped between transfer tube and reparation cylinder, high-pressure pump, which will repair liquid, which squeezes into chemical remediation device, can carry out the reparation of heavily contaminated soil；S4, light contaminated soil are repaired using improvement beneficial bacterium；S5, planting plants carry out soil enrichment purification on Polluted area.
Description
Technical field
The invention belongs to technical field of soil remediation, and in particular to a kind of soil layering restorative procedure.
Background technique
Soil was the natural collecting post and purified treatment place of all kinds of wastes originally, when all kinds of pollutions accommodated in soil
Object is excessive, influences and be more than the self-purification capacity of soil, and soil itself is also required to be repaired.The reason of causing soil pollution is very
It is more, it is some to be distributed in the insecticide factory, chemical fertilizer factory, chemical plant in urban periphal defence suburb etc. originally and become in city due to urban sprawl
Heart district, when changing land use, discovery soil is seriously polluted and cannot function as human lives, live by heavy metal and organic matter
With movable place, it is necessary to which being administered and being repaired could utilize.In addition some farmlands due to by chemical company or adopting for a long time
The pollution of sewage and exhaust gas, the exceeded crops of growth harmful substance, it is also necessary to which improvement could cultivate are discharged in mine smelting enterprise.City
Refuse landfill diffusate in township's seriously polluted soil and groundwater source.Cause for these reasons in these soil containing chromium,
The heavy metals such as lead, mercury, cadmium, arsenic and poisonous and harmful substance severely exceed.
Basically, the technical principle of contaminated soil remediation may include are as follows: (1) changes the presence of pollutant in the soil
Form or combination with soil, reduce its transportable property and bioavailability in the environment；(2) reducing has in soil
The concentration of evil substance.
Soil remediation, which is divided into, to be carried out in situ reparation and repairs contaminated soil displacement.By contaminated soil
Displacement is repaired, and project amount is larger, is unsuitable for large-scale soil remediation.It is carried out in situ reparation, is often directly passed through
Soil-repairing agent is added to be repaired, but since the ingredient of soil-repairing agent is had nothing in common with each other, and be added soil-repairing agent it
Afterwards, the amount of soil-repairing agent can not be controlled, causes the waste of soil-repairing agent, and soil remediation is inefficient.
Summary of the invention
The purpose of the present invention is to provide a kind of soil layering restorative procedures, by the way that contaminated soil to be layered, by heavily contaminated
Soil is kept apart with light contaminated soil, is changed comprehensive heavily contaminated reparation as local heavily contaminated reparation, is considerably reduced engineering cost,
Shorten repairing efficiency.
Present invention technical problem to be solved are as follows:
1, how to shorten the repairing efficiency of contaminated soil；
2, the comprehensive processing of the subregion of heavily contaminated soil how is realized；
3, the heavy metal in contaminated soil how is rapidly removed.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of soil layering restorative procedure, specifically includes the following steps:
S1, geological mapping is carried out to contaminated soil, on Polluted area ground, every 3m in same point, from top to bottom
Every the concentration of the vertical sample detection heavy metal contaminants of 2-4cm, depth selection 5-12m determines the longitudinal, horizontal of contaminated soil
It is distributed to heavy metal concentration；
S2, contaminated soil is divided into three layers, is followed successively by heavily contaminated soil, light contaminated soil, pollution-free soil from top to bottom,
One piece of reparation pond is dug out in Polluted area, repairs and spreads one layer of impervious barrier in pond, chemical remediation device is then put into reparation
In pond, the heavily contaminated soil of the former heavily contaminated soil repaired in pond and contaminated area is dug into concentration investment and is repaired in pond；
S3, it is placed with reparation cylinder on one side in reparation pond, repairs in cylinder and be contained with reparation liquid, passes through transfer tube and connect reparation
Cylinder and chemical remediation device, are equipped with high-pressure pump between transfer tube and reparation cylinder, high-pressure pump squeezes into chemical remediation device for liquid is repaired
It can carry out the reparation of heavily contaminated soil；
S4, light contaminated soil is mixed with improvement beneficial bacterium according to weight ratio 500:4-7, then by 2/3 mixing
Soil uniformly fills in light contaminated soil；Remaining mixed soil is uniformly sprinkling upon light contaminated soil surface；
S5, planting plants carry out soil enrichment purification on Polluted area.
Further, chemical remediation device described in step S3 includes transverse tube, stud, perpendicular branch pipe and extension, transverse tube, stud
It is integrally formed with perpendicular branch pipe, stud and perpendicular branch pipe oppose and the two sides of transverse tube are arranged in, and stud and perpendicular branch pipe correspond, extension
The two sides of perpendicular branch pipe are symmetrically screwed onto, one end of extension is connected with extension ball, uniformly opens on the extension and extension ball
There is spray hole；It is connected with Soil K+adsorption on the perpendicular branch pipe and surveys device.
Further, the weight percent of reparation each raw material of liquid are as follows: activation kaolin 35-45%, carboxymethyl cellulose
Plain sodium 5-10%, quick lime 5-10%, heavy metal reducing agent 4-7%, soil improvement bacterium 3-6%, surplus are water.
Further, the described reparation liquid the preparation method comprises the following steps:
(1) it activates kaolin: kaolin being added in ball mill and is ground, water is added to be modulated into the height that concentration is 30%
50% concentrated nitric acid solution is added in ridge soil solution while stirring, when the pH of kaolin solution is 2.0-3.0, stops concentrated nitric acid
Addition, continue stir 10-15min, again measure kaolin solution pH be 2.0-3.0 when, filtering, eluted using purified water
To neutrality, filter residue is dried, is put into Muffle furnace, calcines 5h at 600-800 DEG C, pulverized and sieved up to the kaolin of activation；
(2) kaolinic organic composite: the kaolin of activation and heavy metal reducing agent is taken to be added in ball mill, in cylinder
Revolving speed is to grind 6-7h under 24-30r/min, and the kaolin for having adsorbed heavy metal reducing agent is then added to screw extruder
In, melting extrusion is carried out at 125-132 DEG C, heavy metal reducing agent is entered in kaolinic layer lattice by kaolinic surface intercalation
Portion；
(3) other components of kaolin and reparation liquid after intercalation are added in blender, are stirred 1-3h to obtain the final product
To reparation liquid.
Further, the soil improvement bacterium includes anaerobic ammonia oxidizing bacteria, thiobacillus denitrificans and anaerobic spore-bearing bacilli.
Further, in step S4, the depth of the waste pit of landfill is 8-15cm, and the spacing of waste pit is 0.2-0.3m.
Beneficial effects of the present invention:
(1) a kind of soil layering restorative procedure provided by the invention, by the way that contaminated soil is divided into three layers, in Polluted area
It digs out one piece of reparation pond, repairs and spread one layer of impervious barrier in pond, heavily contaminated soil concentration investment is repaired into pond, i.e., it will weight dirt
Dye soil is kept apart with light contaminated soil, is changed comprehensive heavily contaminated reparation as local heavily contaminated reparation, is considerably reduced engineering cost
With, contaminated soil light in this way can reach the target of soil remediation in advance so that large area soil obtain in advance repair carry out using,
Shorten repairing efficiency；
(2) by chemical remediation device, the setting for extending ball increases the contact surface and infiltration for repairing liquid and heavily contaminated soil
Saturating face can facilitate heavily contaminated soil faster and comprehensively be repaired, realize the comprehensive reparation in heavily contaminated soil dividing district
Processing；
(3) kaolin repaired in liquid adsorbs heavily contaminated soil first, and then the heavy metal in the kaolin after intercalation is also
The heavily contaminated soil of former agent is reacted, so that the highly toxic high price heavy metal of heavily contaminated soil is reduced to the low price of hypotoxicity
Heavy metal, then on the kaolin, a part is formed with the hydroxyl repaired in liquid for heavy metal a part absorption complexing of low price
Precipitating, biochemical reduction reaction occurs by soil improvement bacterium in some, to thoroughly eliminate heavily contaminated soil
In toxic heavy metal.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is soil fertility status schematic diagram of the present invention；
Fig. 2 is soil remediation top view of the present invention；
Fig. 3 is chemical remediation device main view；
Fig. 4 is chemical remediation device top view；
Attached drawing mark:
1- heavily contaminated soil, the light contaminated soil of 2-, 3- is pollution-free soil, 4- repair pond, 5- chemical remediation device, 51-
Transverse tube, 52- stud, 53- erect branch pipe, 54- extension, and 55- extends ball, and 56- Soil K+adsorption surveys device, and 6- repairs cylinder, 7- transfer tube.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
It please referring to shown in Fig. 1-4, the present invention is a kind of soil layering restorative procedure, specifically includes the following steps:
S1, geological mapping is carried out to contaminated soil, on Polluted area ground, every 3m in same point, from top to bottom
Every the concentration of the vertical sample detection heavy metal contaminants of 3cm, depth selection 10m determines longitudinally, laterally weighing for contaminated soil
Metal concentration distribution；
S2, contaminated soil is divided into three layers, is followed successively by heavily contaminated soil 1, light contaminated soil 2, pollution-free soil from top to bottom
Earth 3 digs out one piece of reparation pond 4 in Polluted area, repairs and spread one layer of impervious barrier in pond 4, then put chemical remediation device
Enter to repair in pond 4, the heavily contaminated soil 1 of the former heavily contaminated soil 1 repaired in pond 4 and contaminated area is dug into concentration investment and is repaired
In multiple pond 4；
S3, it is placed on one side in reparation pond 4 and repairs cylinder 6, repaired in cylinder 6 and be contained with reparation liquid, connected by transfer tube 7
Cylinder 6 and chemical remediation device 5 are repaired, high-pressure pump is equipped between transfer tube 7 and reparation cylinder 6, high-pressure pump squeezes into chemistry for liquid is repaired
Prosthetic device 5 can carry out the reparation of heavily contaminated soil 1；
S4, light contaminated soil 2 is mixed with improvement beneficial bacterium according to weight ratio 500:5, then by 2/3 composite soil
Earth uniformly fills in light contaminated soil 2, and the depth of waste pit is 10cm, and the spacing of waste pit is 0.2m；By remaining mixing
Soil is uniformly sprinkling upon light 2 surface of contaminated soil；
S5, planting plants carry out soil enrichment purification on Polluted area；
The chemical remediation device includes transverse tube 51, stud 52, perpendicular branch pipe 53 and extension 54, transverse tube 51, stud 52
It is integrally formed with perpendicular branch pipe 53, stud 52 and perpendicular branch pipe 53 oppose and the two sides of transverse tube 51, stud 52 and perpendicular branch pipe 53 1 are arranged in
One is corresponding, and extension 54 is symmetrically screwed onto the two sides of perpendicular branch pipe 53, and one end of extension 54, which is connected with, extends ball 55, and described prolongs
It stretches pipe 54 and extends and be uniformly provided with spray hole on ball 55, the setting for extending ball 55 increases connecing for reparation liquid and heavily contaminated soil 1
Contacting surface and permeable face can facilitate heavily contaminated soil 1 faster and comprehensively be repaired；Soil is connected on the perpendicular branch pipe 53
Device 56 is surveyed in detection, and the heavily contaminated soil 1 in each orientation thus can be monitored in real time；Using this structure, soil can be carried out
Multidomain treat-ment, when original soil treatment, heavily contaminated soil, light contaminated soil and pollution-free soil are regardless of causing
Repair liquid waste；
The weight percent of reparation each raw material of liquid are as follows: activation kaolin 40%, sodium carboxymethylcellulose 6%, life
Lime 6%, heavy metal reducing agent 5%, soil improvement bacterium 5%, surplus are water；
The described reparation liquid the preparation method comprises the following steps:
(1) it activates kaolin: kaolin being added in ball mill and is ground, water is added to be modulated into the height that concentration is 30%
50% concentrated nitric acid solution is added in ridge soil solution while stirring, and the pH for detecting kaolin solution is 2.4, stops adding for concentrated nitric acid
Enter, continue to stir 15min, the pH for measuring kaolin solution again is 2.5, filtering, is eluted using purified water to neutrality, drying filter
Slag is put into Muffle furnace, calcines 5h at 650 DEG C, is pulverized and sieved up to the kaolin of activation；
(2) kaolinic organic composite: the kaolin of activation and heavy metal reducing agent is taken to be added in ball mill, in cylinder
Revolving speed is to grind 6h under 25r/min, and the activated impurity eliminated in kaolin structure layer of kaolin has dredged kaolinic hole
Gap enhances kaolinic absorption property, improves the absorption of kaolin counterweight metallic reducing agent, will then adsorb heavy metal
The kaolin of reducing agent is added in screw extruder, melting extrusion is carried out at 125-132 DEG C, heavy metal reducing agent is by kaolinite
The surface intercalation of soil enters inside kaolinic layer lattice, expands the specific surface area of heavy metal reducing agent；
(3) other components of kaolin and reparation liquid after intercalation are added in blender, are stirred 2h and obtain
Liquid is repaired, the kaolin in the reparation liquid adsorbs heavily contaminated soil first, then the heavy metal reduction in the kaolin after intercalation
The heavily contaminated soil of agent is reacted, so that the highly toxic high price heavy metal of heavily contaminated soil is reduced to the low price weight of hypotoxicity
Metal, then on the kaolin, it is heavy that a part is formed with the hydroxyl repaired in liquid for heavy metal a part absorption complexing of low price
It forms sediment, biochemical reduction reaction occurs by soil improvement bacterium in some, to thoroughly eliminate in heavily contaminated soil
Toxic heavy metal.
The soil improvement bacterium includes anaerobic ammonia oxidizing bacteria, thiobacillus denitrificans and anaerobic spore-bearing bacilli.
The above content is just an example and description of the concept of the present invention, affiliated those skilled in the art
It makes various modifications or additions to the described embodiments or is substituted in a similar manner, without departing from invention
Design or beyond the scope defined by this claim, be within the scope of protection of the invention.
Claims (6)
1. a kind of soil layering restorative procedure, it is characterised in that: specifically includes the following steps:
S1, to contaminated soil carry out geological mapping, on Polluted area ground, every 3m in same point, from top to bottom every
The concentration of the vertical sample detection heavy metal contaminants of 2-4cm, depth selection 5-12m determine longitudinally, laterally weighing for contaminated soil
Metal concentration distribution；
S2, contaminated soil is divided into three layers, is followed successively by heavily contaminated soil (1), light contaminated soil (2), pollution-free soil from top to bottom
Earth (3) digs out one piece of reparation pond (4) in Polluted area, repairs and spread one layer of impervious barrier in pond (4), then by chemical remediation
Device, which is put into, to be repaired in pond (4), by the heavily contaminated soil (1) of former the heavily contaminated soil (1) repaired in pond (4) and contaminated area
Concentration investment is dug to repair in pond (4)；
S3, it is placed on one side in reparation pond (4) and repairs cylinder (6), repaired in cylinder (6) and is contained with reparation liquid, pass through transfer tube (7)
Cylinder (6) and chemical remediation device (5) are repaired in connection, and high-pressure pump is equipped between transfer tube (7) and reparation cylinder (6), and high-pressure pump will be repaired
Multiple liquid, which squeezes into chemical remediation device 5, can carry out the reparation of heavily contaminated soil (1)；
S4, light contaminated soil (2) is mixed with improvement beneficial bacterium according to weight ratio 500:4-7, then by 2/3 composite soil
Earth uniformly fills in light contaminated soil (2)；Remaining mixed soil is uniformly sprinkling upon light contaminated soil (2) surface；
S5, planting plants carry out soil enrichment purification on Polluted area.
2. a kind of soil layering restorative procedure according to claim 1, it is characterised in that: chemical remediation described in step S3
Device (5) includes transverse tube (51), stud (52), perpendicular branch pipe (53) and extension (54), transverse tube (51), stud (52) and perpendicular branch pipe
(53) it is integrally formed, stud (52) and perpendicular branch pipe (53) opposition are arranged in the two sides of transverse tube (51), stud (52) and perpendicular branch pipe
(53) it corresponds, extension (54) is symmetrically screwed onto the two sides of perpendicular branch pipe (53), and one end of extension (54) is connected with extension
Spray hole is uniformly provided in ball (55), the extension (54) and extension ball (55)；Soil is connected on the perpendicular branch pipe (53)
Device (56) are surveyed in earth detection.
3. a kind of soil layering restorative procedure according to claim 1, it is characterised in that: reparation each raw material of liquid
Weight percent are as follows: activation kaolin 35-45%, sodium carboxymethylcellulose 5-10%, quick lime 5-10%, heavy metal reducing agent
4-7%, soil improvement bacterium 3-6%, surplus are water.
4. a kind of soil layering restorative procedure according to claim 3, it is characterised in that: the preparation side of the reparation liquid
Method are as follows:
(1) it activates kaolin: kaolin being added in ball mill and is ground, water is added to be modulated into the kaolin that concentration is 30%
50% concentrated nitric acid solution is added in solution while stirring, when the pH of kaolin solution is 2.0-3.0, stops adding for concentrated nitric acid
Enter, continue to stir 10-15min, when the pH for measuring kaolin solution again is 2.0-3.0, filtering is eluted using purified water into
Property, filter residue is dried, is put into Muffle furnace, 5h is calcined at 600-800 DEG C, is pulverized and sieved up to the kaolin of activation；
(2) kaolinic organic composite: the kaolin of activation and heavy metal reducing agent is taken to be added in ball mill, in drum speed
To grind 6-7h under 24-30r/min, then the kaolin for having adsorbed heavy metal reducing agent is added in screw extruder,
Melting extrusion is carried out at 125-132 DEG C, heavy metal reducing agent is entered inside kaolinic layer lattice by kaolinic surface intercalation；
(3) other components of kaolin and reparation liquid after intercalation are added in blender, are stirred 1-3h and are repaired
Multiple liquid.
5. a kind of soil layering restorative procedure according to claim 1, it is characterised in that: the soil improvement bacterium packet
Include anaerobic ammonia oxidizing bacteria, thiobacillus denitrificans and anaerobic spore-bearing bacilli.
6. a kind of soil layering restorative procedure according to claim 1, it is characterised in that: in step S4, the landfill of landfill
The depth in hole is 8-15cm, and the spacing of waste pit is 0.2-0.3m.
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| CN201810654547.1A CN108927404B (en) | 2018-06-22 | 2018-06-22 | Layered soil remediation method |
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| CN201810654547.1A CN108927404B (en) | 2018-06-22 | 2018-06-22 | Layered soil remediation method |
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| CN108927404B CN108927404B (en) | 2021-05-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110340136A (en) * | 2019-07-22 | 2019-10-18 | 鸿灌环境技术有限公司 | A kind of layering restorative procedure of heavy-metal contaminated soil |
| CN110369481A (en) * | 2019-07-02 | 2019-10-25 | 南华大学上虞高等研究院有限公司 | A kind of reparation of uranium contaminated soil multistage pre-buried packet and its application method |
| CN111360051A (en) * | 2020-04-10 | 2020-07-03 | 福建联拓环境治理有限公司 | Remediation method for heavy metal pollution of soil |
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| CN111360051A (en) * | 2020-04-10 | 2020-07-03 | 福建联拓环境治理有限公司 | Remediation method for heavy metal pollution of soil |
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| CN108927404B (en) | 2021-05-11 |
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