CN104479684B - A kind of Heavy Metals in Soil Contaminated curing agent and its curing method - Google Patents
A kind of Heavy Metals in Soil Contaminated curing agent and its curing method Download PDFInfo
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Abstract
A kind of Heavy Metals in Soil Contaminated curing agent and its curing method.A kind of Heavy Metals in Soil Contaminated curing agent, it is characterised in that：By weight percentage, the curing agent is by following three kinds at being grouped as：Flyash 33%-40%, lime 34%-51%, peat 16%-33%.It is 1 by the curing agent and heavy-metal contaminated soil when handling contaminated soil using the curing agent:10-20（Weight ratio）It is sufficiently mixed, adds the mixture 40%（Weight ratio）Water, be thoroughly mixed.A kind of Heavy Metals in Soil Contaminated curing agent of the present invention is all using natural minerals as raw material, it is without secondary pollution, soil fertility can be effectively improved while curing heavy metal, solve the technical issues of existing chemical repair method significantly changes soil pH value and causes soil hardening.
Description
Technical field
The invention belongs to field of environment engineering technology more particularly to a kind of Heavy Metals in Soil Contaminated curing agent and users
Method.
Background technique
Heavy metal generally refers to specific gravity in about 45 kinds of elements of 5.0g/cm3 or more.A huge sum of money in Study on environmental pollution
Category is primarily referred to as the significant element of the bio-toxicities such as Pb, Cd, Hg, Cr and metalloid As, further includes having one
Determine the elements such as heavy metal Zn, Cu, Co, Ni and Sn of toxicity.The domestic cadmium rice event successively occurred in recent years, causes party and state
Family pays high attention to.2 months 2011 No. 18,《The planning of heavy metal pollution integrated control " 12th Five-Year Plan "》State Council is obtained formally to criticize
It is multiple, become first granted " 12th Five-Year Plan " planning, 5 years following according to the planning requirement, state revenue will put into about 75,000,000,000
The special fund of member, integrated control heavy metal pollution.
Heavy metal pollution of soil refers to that mankind's activity inputs heavy metal in soil, causes heavy metal content in soil obviously high
In background content, and the phenomenon that cause eco-environmental quality to deteriorate.Heavy-metal contaminated soil restorative procedure mainly has following at present
It is several：
First is visitor（It changes）Local method：New non-polluting soil is changed after surface soil is partly or entirely removed, or contaminated
Upper soll layer cover non-polluting soil or mixing, so that pollutant concentration is reduced or reduce contact of the pollutant with root system of plant,
Achieve the purpose that mitigate harm.This methods engineering amount is big, investment cost is high, destructible soil structures, and the dirt soil to swap out needs
It deals carefully with, is not suitable for the improvement of pollution in wide area soil.
Second is Electroremediation：Plug electrode at contaminated soil both ends, after powering on, charged particle in soil to
It is moved on the different electrode of polarity, then electrode is collected by engineering measure and is handled, to reach removing Polluted Soil
The purpose of heavy metal in earth.This method due to practical contaminated soil area is generally large and function of current distance is too small, because
This is difficult to promote, and operating cost is too high.
Third is phytoremediation：It is main that heavy metal in soil is absorbed by super enriching plant, heavy metal is transferred to plant
Then the aboveground vegetation part of enriching heavy metal is gathered in, recycles heavy metal after burning, reach reparation by aerial part
The mesh of pollution
's.This method is affected by environmental condition and pest and disease damage, and is limited by plant culture and growth, the period compared with
It is long, it repairs
Efficiency is lower.
Fourth is that chemical leaching method：The heavy metal in contaminated soil is eluted using specific chemical reagent, then
The waste liquid eluted is handled.This method higher cost, and for washed off soil chemical reagent into
Enter soil and easily causes secondary pollution.
Fifth is that solidification and stabilization：It is generally reacted using curing agent with Heavy Metals in Contaminated Soils, generates stable material, from
And the Leaching of heavy metal is reduced, reach reparation purpose.
Currently, curing process is that domestic and international heavy metal pollution of soil of administering applies wider one of technology.Research is compared into
Ripe is the fixation of lime, flyash to Pb, Cr, Cu, Zn.But for Pb, As combined pollution, there are no effective improvement sides
Method.Because being conducive to the fixation of Pb in higher pH, but it is detrimental to the fixation of As, conversely, in lower pH
The fixation for being conducive to As is unfavorable for the fixation of Pb；Pb is easy to leach at a low ph.Therefore, suitable curing agent, solidification effect are prepared
Good, without secondary pollution, the cheap heavy metal curing agent of fruit become heavy-metal contaminated soil reparation key technology, explore with
Natural minerals or waste are that raw material prepare important research side of the heavy metal curing agent as heavy-metal contaminated soil reparation
To.
Summary of the invention
1, the technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, by organic curing agent and inorganic solidification agent
It is applied in combination, enables to reach to two heavy metal species of Pb, As while cured purpose.And collaboration enhancing heavy metal between component
Cured effect, the heavy metal-polluted soil Leaching leaching rate after solidification can achieve《Hazardous waste judging standard Leaching
Identify（GB5085.3-2007）Related request.
In order to solve the above technical problems, technical solution proposed by the present invention be a kind of Heavy Metals in Soil Contaminated curing agent and its
Curing method, by weight percentage, the curing agent is by following three kinds at being grouped as：Flyash 33%-40%, lime 34%-
51%, peat 16%-33%.
Preferably, the flyash of the dye heavy metal-polluted soil curing agent addition 33%, 34% lime, 33% peat；Or
40% flyash, 40% lime, 20% peat；Or 33% flyash, 51% lime, 16% peat or 37% flyash, 41% stone
Ash, 22% peat.
The present invention provides the preparation method of Heavy Metals in Soil Contaminated curing agent, and this method includes：
1) flyash, lime, peat are weighed in the ratio of setting, it is spare：
2）By peat in Muffle furnace 450 DEG C of calcining 4.5h.
3）Flyash, lime, calcined peat are sufficiently mixed uniformly, Heavy Metals in Soil Contaminated curing agent is obtained,
Middle coal ash, lime, peat are sufficiently crushed first with ball milling instrument powder to be remixed uniformly.
The present invention also provides the method that Heavy Metals in Soil Contaminated curing agent solidifies Heavy Metals in Contaminated Soils, this method includes
Following steps：
1）It is 1 by the heavy metal curing agent and the weight ratio of heavy-metal contaminated soil:10-20 is mixed, and stirring is equal
It is even, obtain mixture；
2）The mixture 40% is added（Weight ratio）Water, stir, stand molding, conserved, complete solid
Change.
The method that the Heavy Metals in Soil Contaminated curing agent solidifies Heavy Metals in Contaminated Soils, the step 1）In, by institute
The weight ratio for stating heavy metal curing agent weight and contaminated soil is 1:10,1:15,1:20 are mixed.
The method that the Heavy Metals in Soil Contaminated curing agent solidifies Heavy Metals in Contaminated Soils, the stirring in the step 2)
Time is 10min, is solidified 15 days.
The method that the Heavy Metals in Soil Contaminated curing agent solidifies Heavy Metals in Contaminated Soils, the step 2）Maintenance processes
In cured surface use diaphragm seal.
The method that the Heavy Metals in Soil Contaminated curing agent solidifies Heavy Metals in Contaminated Soils, the heavy metal pollution of soil
In heavy metal ion be Pb, As.
The invention has the advantages that：
Of the invention mainly has stronger inhibitory effect to heavy metal using inorganic amendment, while playing organic matter
Expect the principle to the stronger regulatory function of Soil Fertility Quality.Flyash is larger in China's discharge amount at present, not only have compared with
Strong metal adsorption ability, and the substance with pozzolanic activity can be generated under the high temperature conditions, main component two
Silica and aluminum oxide, and it is mostly in amorphous state.The principle of solidification of flyash is that important is can be with a huge sum of money
Belong to and generate precipitate metal hydroxides, while also with the surface complexing of floccule body surface mass, by adding industrial powder
The mode of coal ash mixes with lime and solidifies to heavy-metal contaminated soil as auxiliary curing agent, can effectively solidify a huge sum of money
Belong to, and low in cost.Peat is added on the basis of this again will not influence the fixation to Pb on the whole, be conducive to the suction to As
It is attached, moreover it is possible to which that it is excessively high to change the soil pH due to caused by lime fly ash, the problems such as soil hardening, increases edaphon and enzyme activity
Property, to enhance soil fertility level.
Using the heavy-metal contaminated soil of curing process of the present invention, according to People's Republic of China's standard《It is dangerous
Waste judging standard leaching characteristic identification》（GB5085.3-2007）Hazardous waste leaching characteristic identification, experiment
Result data is lower than Extraction Toxicity Identification Standard of Hazardous Waste value.Compared with the prior art, the advantages of the present invention are as follows：The present invention
Technical solution by being solidified using lime, flyash and peat to heavy-metal contaminated soil, using inorganic organic curing
Material simultaneously solidifies Pb and As.Not only the pollution problem of heavy metal had been handled, but also this kind of industrial waste of flyash is utilized.
In addition, not only raw material sources are extensive for curing agent and curing method of the invention, manufacturing cost is low, and curing process cost is even more
Relative moderate, the heavy metal soil after solidifying, its Leaching of Heavy Metals concentration is still below hazardous waste mirror under extreme conditions
Limit value in other standard, toxicity risk are substantially reduced, and solidification effect is ideal.
Specific embodiment
Come that the present invention is furture elucidated below by the detailed description of specific embodiment, but is not to limit of the invention
System, only illustrates.
Embodiment 1
1）The flyash that weight percent is 33% is weighed, 34% lime, 33% peat, peat is first in Muffle furnace warp
It crosses under 450 DEG C of high temperature and calcines 4.5h, be sufficiently pulverized and mixed using ball milling instrument, obtain Heavy Metals in Soil Contaminated curing agent；
2）Pb, As contaminated soil 100g are weighed, the above-mentioned curing agent of 10g is added, stirs evenly, the mixture is added
40%（Weight ratio）Tap water, 10min is sufficiently stirred, is uniformly mixed, using diaphragm seal, stands maintenance 15 days；
3）Solidified body uses solid waste Leaching leaching method-hac buffer method (HJ/ respectively after 15 days
T300-2007 leachate) is obtained, and is used《The measurement of soil pH》（Agricultural industry criteria NY/T 1377-2007）Measurement soil
Earth pH value.
Through detecting, 3.7mg/L is lower than detection after the leaching concentration of Pb drops to solidification by 34.1 mg/L before curing
The leaching concentration of value, As drops to the 2.0mg/L after solidifying lower than detection limit by 21.2 mg/L before curing, and pH value is stablized
5.8 or so.
Embodiment 2
1）The flyash that weight percent is 40% is weighed, 40% lime, 20% peat, peat is first in Muffle furnace warp
It crosses under 450 DEG C of high temperature and calcines 4.5h, be sufficiently pulverized and mixed using ball milling instrument, obtain Heavy Metals in Soil Contaminated curing agent；
2）Pb, As contaminated soil 100g are weighed, the above-mentioned curing agent of 15g is added, stirs evenly, the mixture is added
40%（Weight ratio）Tap water, 10min is sufficiently stirred, is uniformly mixed, using diaphragm seal, stands maintenance 15 days；
3）Solidified body uses solid waste Leaching leaching method-hac buffer method (HJ/ respectively after 15 days
T300-2007 leachate) is obtained, and is used《The measurement of soil pH》（Agricultural industry criteria NY/T 1377-2007）Measurement soil
Earth pH value.
Through detecting, 3.5mg/L is lower than detection after the leaching concentration of Pb drops to solidification by 34.8 mg/L before curing
The leaching concentration of value, As drops to the 2.2mg/L after solidifying lower than detection limit by 21.5 mg/L before curing, and pH value is stablized
5.8 or so.
Embodiment 3
1）The flyash that weight percent is 33% is weighed, 51% lime, 16% peat, peat is first in Muffle furnace warp
It crosses under 450 DEG C of high temperature and calcines 4.5h, be sufficiently pulverized and mixed using ball milling instrument, obtain Heavy Metals in Soil Contaminated curing agent；
2）Pb, As contaminated soil 100g are weighed, the above-mentioned curing agent of 10g is added, stirs evenly, the mixture is added
40%（Weight ratio）Tap water, 10min is sufficiently stirred, is uniformly mixed, using diaphragm seal, stands maintenance 15 days；
3）Solidified body uses solid waste Leaching leaching method-hac buffer method (HJ/ respectively after 15 days
T300-2007 leachate) is obtained, and is used《The measurement of soil pH》（Agricultural industry criteria NY/T 1377-2007）Measurement soil
Earth pH value.
Through detecting, 2.8mg/L is lower than detection after the leaching concentration of Pb drops to solidification by 34.6 mg/L before curing
The leaching concentration of value, As drops to the 2.1mg/L after solidifying lower than detection limit by 21.3 mg/L before curing, and pH value is stablized
5.8 or so.
Embodiment 4
1）The flyash that weight percent is 37% is weighed, 41% lime, 22% peat, peat is first in Muffle furnace warp
It crosses under 450 DEG C of high temperature and calcines 4.5h, be sufficiently pulverized and mixed using ball milling instrument, obtain Heavy Metals in Soil Contaminated curing agent；
2）Pb, As contaminated soil 100g are weighed, the above-mentioned curing agent of 20g is added, stirs evenly, the mixture is added
40%（Weight ratio）Tap water, 10min is sufficiently stirred, is uniformly mixed, using diaphragm seal, stands maintenance 15 days；
3）Solidified body uses solid waste Leaching leaching method-hac buffer method (HJ/ respectively after 15 days
T300-2007 leachate) is obtained, and is used《The measurement of soil pH》（Agricultural industry criteria NY/T 1377-2007）Measurement soil
Earth pH value.
Through detecting, 3.2mg/L is lower than detection after the leaching concentration of Pb drops to solidification by 34.8 mg/L before curing
The leaching concentration of value, As drops to the 2.5mg/L after solidifying lower than detection limit by 21.3 mg/L before curing, and pH value is stablized
5.8 or so.
Claims (4)
1. a kind of preparation method of Heavy Metals in Soil Contaminated curing agent, it is characterised in that：
（1）By weight percentage, flyash 33%-40%, lime 34%-51%, peat 16%-33%；Weigh flyash, stone
Ash, peat, it is spare；
（2）By peat in Muffle furnace 450 DEG C of calcining 4.5h；
（3）Flyash, lime, calcined peat are sufficiently mixed uniformly, Heavy Metals in Soil Contaminated curing agent is obtained.
2. a kind of preparation method of Heavy Metals in Soil Contaminated curing agent according to claim 1, it is characterised in that：Addition
33% flyash, 34% lime, 33% peat；Or 33% flyash, 51% lime, 16% peat.
3. a kind of preparation method of Heavy Metals in Soil Contaminated curing agent according to claim 1, it is characterised in that：First with
Ball milling instrument, which sufficiently crushes flyash, lime, calcined peat, to be remixed uniformly.
4. Heavy Metals in Soil Contaminated curing agent made from the method according to claim 11 solidifies Heavy Metals in Contaminated Soils
Method, it is characterised in that：
1）It is 1 by the heavy metal curing agent and the weight ratio of heavy-metal contaminated soil:10-20 is mixed, and is stirred evenly,
Obtain mixture；
2）The water that weight is the mixture weight 40% is added, stirs, stands molding, is conserved, completes solid
Change；
The step 2）In mixing time be 10min, solidify 15 days；
The step 2）Cured surface uses diaphragm seal in maintenance processes；
Heavy metal ion in the heavy metal pollution of soil is Pb, As.
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104973843B (en) * | 2015-07-16 | 2016-09-21 | 成都德菲环境工程有限公司 | A kind of soil remediation medicament and restorative procedure thereof |
| CN116218537A (en) * | 2015-11-23 | 2023-06-06 | 辛衷瑜 | Soil conditioner, preparation method and application thereof, and soil conditioning method |
| CN105598156A (en) * | 2016-01-14 | 2016-05-25 | 中国矿业大学 | Heavy metal curing agent and method for treating heavy metal compound contaminated soil by same |
| CN105802635A (en) * | 2016-04-25 | 2016-07-27 | 浙江丰瑜生态科技有限公司 | Soil heavy metal passivator |
| CN105855283A (en) * | 2016-06-15 | 2016-08-17 | 中科院广州化灌工程有限公司 | Treatment method for heavy metal contaminated soil |
| CN108787734B (en) * | 2018-05-25 | 2020-09-01 | 四川川能环保科技有限公司 | Method for repairing heavy metal contaminated soil by combining curing agent and microorganisms |
| CN109912346A (en) * | 2019-04-09 | 2019-06-21 | 贵州净界科技有限公司 | A kind of Grown In Zinc Contaminated Soil renovation agent and preparation method thereof |
| CN112371712A (en) * | 2020-10-21 | 2021-02-19 | 安阳工学院 | Heavy metal contaminated soil solidification-plant cooperative remediation method |
| CN115074134B (en) * | 2022-06-25 | 2023-10-27 | 武汉市秀谷科技有限公司 | Soil curing agent and preparation method thereof |
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| CN102746850A (en) * | 2012-07-02 | 2012-10-24 | 浩蓝环保股份有限公司 | Preparation method of fly ash stabilizing agent for managing heavy metal pollution |
| CN104056855A (en) * | 2014-06-27 | 2014-09-24 | 山鑫科陶科技（北京）股份有限公司 | Reparation method of polluted soil |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102746850A (en) * | 2012-07-02 | 2012-10-24 | 浩蓝环保股份有限公司 | Preparation method of fly ash stabilizing agent for managing heavy metal pollution |
| CN104056855A (en) * | 2014-06-27 | 2014-09-24 | 山鑫科陶科技（北京）股份有限公司 | Reparation method of polluted soil |
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Denomination of invention: A heavy metal solidification agent for contaminated soil and its solidification method Effective date of registration: 20221219 Granted publication date: 20181116 Pledgee: Jizhou sub branch of Jiujiang Bank Co.,Ltd. Pledgor: JIANGXI LYUJUREN ECOLOGICAL ENVIRONMENT CO.,LTD. Registration number: Y2022980028172 |
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