CN110304706A - A kind of soil-mineral composite and its preparation method and application of barrier heavy metal pollution in situ - Google Patents
A kind of soil-mineral composite and its preparation method and application of barrier heavy metal pollution in situ Download PDFInfo
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- CN110304706A CN110304706A CN201910689375.6A CN201910689375A CN110304706A CN 110304706 A CN110304706 A CN 110304706A CN 201910689375 A CN201910689375 A CN 201910689375A CN 110304706 A CN110304706 A CN 110304706A
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- soil
- mineral
- heavy metal
- metal pollution
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Classifications
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- 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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of soil-mineral composites and its preparation method and application of barrier heavy metal pollution in situ.Soil-the mineral composite is prepared using soil, mineral material and water, wherein the weight proportion of soil and mineral material is 6~9:1~4, and the dosage of water is 1 times or more of the sum of soil and mineral material weight；The mineral material is silicate mineral and/or porous structure mineral.Composite material of the present invention the preparation method comprises the following steps: the soil of dosage and mineral material are uniformly mixed, add the water of dosage, after impregnating to obtain the final product.Composite material of the present invention is at low cost, environment compatibility is high, blocking not easy to harden, and operational efficiency is high and repairing effect is good.
Description
Technical field
The present invention relates to the repair materials of heavy metal pollution, and in particular to a kind of soil-of barrier heavy metal pollution in situ
Mineral composite and its preparation method and application.
Background technique
Permeable reactive barrier is that specific reaction medium Wei certain environmental pollution improvement's target is reached is mounted on ground by one kind
Face pollution abatement system below, it blocks contaminated zone, converts the lesser compound of harmfulness for pollutant or be fixed
In reaction medium, so that pollutant be made to be converted into environment acceptable form.Permeable Active reaction medium is permeable anti-
The core of wall is answered, the long-term effect of wall operation always affects the popularization and application of the technology, and main influence factor is that reaction is situated between
Matter inactivation and system permeability decline even occur obstruction cause underground water stream with short flow phenomenon, destroy the stream of underground water
Dynamic property.
For solve the problems, such as wall active media material utilization efficiency it is low, it is easy to harden, blocking, research and propose Nanoscale Iron,
The methods of double/more metal systems, modified granulation, provide theoretical direction for the utilization efficiency and service life of reaction medium.Such as public affairs
The number of opening is the patent of invention of CN109319875A, discloses a kind of underground water Compound Heavy Metals renovation agent, specifically chooses
Five kinds of cellulose, active carbon, humic acid, sepiolite and polysaccharide resins raw materials, and it is crushed, is screened, water is then added,
Remove excessive moisture after mixing to get finished product.Five kinds of invention selection is to the stronger raw material phase of heavy metal ion adsorbed property
Mutually cooperation with improve gained renovation agent ion-exchange capacity, complexing, adsorption capacity and interfacial activity etc., thus obtain compared with
Good effect.But the materials such as polysaccharide resins used in the invention is chemical modification materials, and repair materials are to set due to it
In in barrier wall body and disposing ground below, therefore it also becomes a part in aeration zone or water-bearing layer, is surface water and ground
It is lauched important relation channel, and still lacks research of the exogenous chemical substances to the two-way influential effect of underground ring layer environment at present,
Whether bring potential secondary pollution etc. indefinite while obstructing target contaminant, that is to say, that the external sources such as polysaccharide resins
It is indefinite to learn the information such as eco-toxicity, persistence, degradability, cumulative bad, the migration of substance, to the two-way of underground ring layer environment
The research of influential effect has not yet to see running commentary, these will all become the limit for hindering such technology further to develop and promote
Condition processed.Therefore research and development efficiency natural, cheap and easy to get, environmental compatible, sustainable effective active media material are underground water originals
Position recovery technique pursues a goal.
Soil is the final product of rock weathering, is the porous media containing loose minerals and organic matter, has good
Water penetration and aeration, soil are distributed in zonality, are the natural protective barriers of underground environment, but adaptation to local conditions, are taken on the spot
Material prepares soil-mineral composite using water retting method in situ using natural soils, natural minerals as raw material, hinders in situ
Relevant report has been had not yet to see every the research of underground water heavy metal pollution.
Summary of the invention
The technical problem to be solved in the present invention is to provide modified higher cost existing for active media material in the prior art,
Technique is more complex, environment compatibility is not high, the deficiency of operation blocking easy to harden, provide it is a kind of it is at low cost, environment compatibility is high, no
Blocking easy to harden, the soil-mineral composite for the barrier heavy metal pollution in situ that operational efficiency is high and repairing effect is good and its
Preparation method and application.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of soil-mineral composite of barrier heavy metal pollution in situ, it is using soil, mineral material and water preparation
It forms, wherein
The weight proportion of soil and mineral material is 6~9:1~4, and the dosage of water is the sum of soil and mineral material weight
1 times or more；
The mineral material is silicate mineral and/or porous structure mineral.
In soil-mineral composite of the present invention, the dosage of the water is more preferably soil and mineral material
2~5 times for expecting the sum of weight.
In soil-mineral composite of the present invention, the silicate mineral and porous structure mineral can be with
Conventional selection in the prior art, it is preferred that silicate mineral can be selected from bentonite, kaolinite, vermiculite, concave convex rod,
The combination of one or more of sepiolite and wollastonite；Porous structure mineral are then preferably zeolite and/or diatomite.?
When concrete application, the selection of mineral material can be combination of the above-mentioned each material arbitrarily to match.
In soil-mineral composite of the present invention, the granularity of the soil and mineral material is usually all micron
Grade, still, the applicant in experiments it is found that, when the granularity of soil is 150~1000 μm, the granularity of mineral material be 75~
At 300 μm, gained soil-mineral composite has better effect to the permeability for maintaining barrier wall.In the application, institute
It states soil and refers to the soil after air-drying, further refer to the soil of moisture content≤10%, further finger moisture content is 3~10%
Soil.
The present invention also provides soil-mineral composite preparation methods of above-mentioned barrier heavy metal pollution in situ, specifically
Are as follows: each raw material first is weighed by formula, is then uniformly mixed the soil of dosage and mineral material, adds the water of dosage,
After impregnating to obtain the final product.
In above-mentioned preparation method, time of the dipping usually >=10h, preferably 12~48h.
The present invention further comprises soil-mineral composite of above-mentioned barrier heavy metal pollution in situ in remediating heavy metal
Application in the underground water of pollution.
Compared with prior art, present invention is characterized in that
1, using natural soils as framework material, adaptation to local conditions is available locally the present invention；It arranges in pairs or groups again natural minerals material
Expect (layer/chain silicate mineral and/or porous structure mineral), raw material are cheap and easy to get, green ecological, environmental compatible, without time
Raw pollution, potential ecological risk are small；
2, the present invention utilizes solid phase of soil skeleton inner pore system, is cementing with the humus in natural organic matter in soil
Agent uses water retting method in situ soil-mineral composite, soil and mineral material is prepared after mineral material is added
Between synergistic enhancing effect to maintain the permeability and efficient utilization rate of barrier wall while guaranteeing repairing effect；
3, the method for the invention simple process and low cost, can contaminated site now-making-now-using.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, content to better understand the invention, but
The present invention is not limited to following embodiments.
Following number as described in the examples is parts by weight.
Embodiment 1:
It takes somewhere soil (A layers), natural air drying to moisture content is 8%, sorts out impurity, is mechanically pulverized to whole and crosses aperture
1000 μm of sieves collect screenings, and 90 parts of extracting screen underflow are uniformly mixed with 10 parts of partial sizes for 750 μm of bentonite, gained mixture
Add water retting for 24 hours to get compound to soil-mineral of barrier heavy metal pollution in situ of the present invention by the solid-to-liquid ratio of 1:3
Material.
Embodiment 2:
It takes somewhere soil (A layers), natural air drying to moisture content is 8%, sorts out impurity, is mechanically pulverized to whole and crosses aperture
150 μm of sieves collect screenings, and 90 parts of extracting screen underflow are uniformly mixed with 10 parts of partial sizes for 150 μm of bentonite, and gained mixture is pressed
The solid-to-liquid ratio of 1:3 adds water retting for 24 hours to get the soil-mineral composite wood for obstructing heavy metal pollution to original position of the present invention
Material.
Embodiment 3:
It takes somewhere soil (B layers), natural air drying to moisture content is 8%, sorts out impurity, is mechanically pulverized to whole and crosses aperture
1000 μm sieve, collect screenings, 60 parts of extracting screen underflow be 75 μm with 20 parts of partial sizes bentonite and 20 parts of partial sizes be 150 μm
Clinoptilolite is uniformly mixed, and gained mixture adds water retting 48h to hinder to get to original position of the present invention by the solid-to-liquid ratio of 1:4
Every soil-mineral composite of heavy metal pollution.
Embodiment 4:
It takes somewhere soil (B layers), natural air drying to moisture content is 8%, sorts out impurity, is mechanically pulverized to whole and crosses aperture
150 μm sieve, collect screenings, 60 parts of extracting screen underflow be 75 μm with 20 parts of partial sizes bentonite and 20 parts of partial sizes be 150 μm
Clinoptilolite is uniformly mixed, and gained mixture adds water retting 48h to hinder to get to original position of the present invention by the solid-to-liquid ratio of 1:4
Every soil-mineral composite of heavy metal pollution.
Embodiment 5:
It takes somewhere soil (B layers), natural air drying to moisture content is 8%, sorts out impurity, is mechanically pulverized to whole and crosses aperture
150 μm sieve, collect screenings, 60 parts of extracting screen underflow be 75 μm with 20 parts of partial sizes sepiolite and 20 parts of partial sizes be 150 μm
Epidesmine is uniformly mixed, and gained mixture adds water retting 48h to hinder to get to original position of the present invention by the solid-to-liquid ratio of 1:4
Every soil-mineral composite of heavy metal pollution.
Embodiment 6:
It takes somewhere soil (A layers), natural air drying to moisture content is 8%, sorts out impurity, is mechanically pulverized to whole and crosses aperture
150 μm of sieves collect screenings, and 18 parts of extracting screen underflow are uniformly mixed with 2 parts of partial sizes for 75 μm of bentonite, and gained mixture presses 1:
3 solid-to-liquid ratio adds water retting for 24 hours to get the soil-mineral composite for obstructing heavy metal pollution to original position of the present invention.
Comparative example 1:
Repair materials are 20 parts of soil screenings collected in embodiment 6.
Comparative example 2:
Repair materials are that the 16 parts and 4 parts partial sizes of soil screenings collected in embodiment 6 are 75 μm bentonitic mixed
Close object.
Test example 1:
1) it is tested using Simulated rainwater native fish, earth pillar is internal diameter 3cm, and a height of 50cm glass column is average annual according to somewhere
PH value in rainfall 1535.6mm, and the rainwater sample of collection, the Simulated rainwater 1L that secure ph is 6.08, with rain leaching side
Formula carries out leaching test to certain copper zinc polymetallic ore mountain tailing sample, must simulate tailing percolating water, copper in measurement percolating water, zinc,
The content of cadmium；
2) by quartz sand, repair materials (by soil is mixed to gained mixture in embodiment 1-5 with mineral material), quartz
Sand successively divides three layers of dress column (repair materials are placed among two layers of quartz sand), and quartz sand layer height is 2cm, then presses each embodiment
Process conditions progress water retting is compound, obtains soil-mineral composite simulation barrier wall；
3) tailing percolating water will be simulated, it is vertical to flow through barrier wall body, measure Heavy Metals in Waters after flowing through barrier wall
Content investigates barrier wall weight metal removal effect, as a result as described in Table 1.
Table 1:
Test example 2:
Using indoor simulation soil column-leaching test method, earth pillar is internal diameter 3cm, and a height of 50cm glass column first will be quartzy
Sand, repair materials (by soil is mixed to gained mixture in embodiment 1-5 with mineral material), quartz sand successively divide three layers of dress column
(repair materials are placed among two layers of quartz sand), quartz sand layer height are 2cm, and it is multiple to carry out water retting by embodiment process conditions
It closes, obtains soil-mineral composite simulation barrier wall；According to the average annual rainfall 1535.6mm in somewhere, and the rain collected
PH value in water sample, secure ph are 6.08 by lead, zinc, cadmium heavy metal pollution underground water 1L, and the vertical barrier wall body that flows through (divides
High concentration and low concentration are tested respectively), measurement flows through the content of Heavy Metals in Waters after barrier wall, as a result such as following tables
Shown in 2.
Table 2:
Test example 3: the heavy metal removing effect experiment and permeability experiment of composite material of the present invention
Using indoor simulation soil column-leaching test method, earth pillar specification is internal diameter 3cm, and a height of 50cm glass column first will
Quartz sand, repair materials are (by mixture obtained by mixing with mineral material soil in embodiment 6 and comparative example 2 or right
Individual soil in ratio 1), quartz sand successively divide three layers of dress column (repair materials are placed among two layers of quartz sand), quartz sand layer
Height is 2cm, is that 1:3 carries out water retting for 24 hours by solid-to-liquid ratio, obtains soil-mineral composite simulation barrier wall, respectively
Carry out following two groups of tests:
1, it will simulate by heavy metal pollution underground water 300mL (lead, zinc, cadmium concentration are 100mg/L), it is vertical to flow through barrier
Wall, measurement flows through the content investigation barrier wall weight metal removal effect of Heavy Metals in Waters after barrier wall, as a result as follows
It states shown in table 3.
2, the permeability of barrier wall is investigated in simulation natural rainfall intermittence water flowing, as a result as described in Table 4.
Table 3:
Table 4:
Claims (10)
1. a kind of soil-mineral composite of barrier heavy metal pollution in situ, it is characterised in that: it uses soil, mineral material
Material and water are prepared, wherein
The weight proportion of soil and mineral material is 6~9:1~4, and the dosage of water is 1 times of the sum of soil and mineral material weight
More than；
The mineral material is silicate mineral and/or porous structure mineral.
2. soil-mineral composite of barrier heavy metal pollution in situ according to claim 1, it is characterised in that: institute
The dosage for stating water is 2~5 times of the sum of soil and mineral material weight.
3. soil-mineral composite of barrier heavy metal pollution in situ according to claim 1, it is characterised in that: institute
The silicate mineral stated be selected from one or both of bentonite, kaolinite, vermiculite, concave convex rod, sepiolite and wollastonite with
On combination；The porous structure mineral are zeolite and/or diatomite.
4. soil-mineral composite of barrier heavy metal pollution in situ according to claim 1, it is characterised in that: institute
The granularity for stating soil is micron order.
5. soil-mineral composite of barrier heavy metal pollution in situ according to claim 1, it is characterised in that: institute
The granularity for stating mineral material is micron order.
6. soil-mineral composite of barrier heavy metal pollution in situ according to any one of claims 1 to 5,
Be characterized in that: the granularity of the soil is 150~1000 μm, and the granularity of the mineral material is 75~300 μm.
7. obstructing soil-mineral composite preparation method of heavy metal pollution described in claim 1 in situ, feature exists
In: each raw material first is weighed by formula, is then uniformly mixed the soil of dosage and mineral material, adds the water of dosage,
After impregnating to obtain the final product.
8. preparation method according to claim 7, it is characterised in that: the time of dipping >=10h.
9. preparation method according to claim 7, it is characterised in that: the time of dipping is 12~48h.
10. soil-mineral composite of heavy metal pollution is obstructed described in claim 1 in situ on the ground of repairing heavy metal pollution
Application in being lauched.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910689375.6A CN110304706A (en) | 2019-07-29 | 2019-07-29 | A kind of soil-mineral composite and its preparation method and application of barrier heavy metal pollution in situ |
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| CN201910689375.6A CN110304706A (en) | 2019-07-29 | 2019-07-29 | A kind of soil-mineral composite and its preparation method and application of barrier heavy metal pollution in situ |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110878210A (en) * | 2019-11-29 | 2020-03-13 | 云南平海新材料科技有限公司 | Nano active mineral soil heavy metal solidification repair liquid |
| CN111320216A (en) * | 2020-02-21 | 2020-06-23 | 广西博世科环保科技股份有限公司 | Reaction medium material for groundwater heavy metal remediation and construction method of permeable wall |
| CN114345927A (en) * | 2022-01-14 | 2022-04-15 | 江苏省环境工程技术有限公司 | Pollution site risk control barrier material and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114345927A (en) * | 2022-01-14 | 2022-04-15 | 江苏省环境工程技术有限公司 | Pollution site risk control barrier material and application thereof |
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