CN104117529B - A kind of in-situ remediation method containing heavy metal acid ground - Google Patents
A kind of in-situ remediation method containing heavy metal acid ground Download PDFInfo
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- CN104117529B CN104117529B CN201410324855.XA CN201410324855A CN104117529B CN 104117529 B CN104117529 B CN 104117529B CN 201410324855 A CN201410324855 A CN 201410324855A CN 104117529 B CN104117529 B CN 104117529B
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Abstract
The invention discloses a kind of in-situ remediation method containing heavy metal acid ground, comprise the following steps: 1) preparation conditioning matrix 1; 2) preparation conditioning matrix 2; 3) in-situ immobilization.Using of conditioning matrix of the present invention, not only can regulate the acid or alkali environment of soil, improves the self-purification capacity of soil fertility and biology thereof, effectively to solve and improves the acid condition of soil and passivation heavy metal contaminants.The conditioning matrix that the present invention adopts, all from the discarded object of production process, to be easyly easy to get, with low cost, reparation easy and simple to handle, the cycle is short, efficiently solves a difficult problem for in-situ immobilization, can create good economic benefit and social benefit.
Description
Technical field
The present invention relates to a kind of in-situ remediation method containing heavy metal acid ground.
Background technology
Hazardous contaminant, as heavy metal etc. enter soil after there is the characteristic such as biological concentration and accumulation, its poisonous effect, often through the relation of food chain, crops is amplified step by step, to remain in crops, the health of final harm people and animals.Therefore, when a lot of Soils In The Region of current China is serious by heavy metal pollution, by the soil of heavy metal pollution, especially acid ground, it administers very urgent with the research of recovery technique.
Acid ground recovery technique at present by heavy metal pollution can be divided into in-situ immobilization and showering.Comparatively speaking, showering environmental risk is lower and system process predictability is higher, but cost is high and large to environmental perturbation.In-situ immobilization is then more economical and can repair deep layer contaminated soil.
According to the difference of renovation technique and principle, based technique for in-situ remediation mainly contains chemical redemption and biological prosthetic.Adopt that chemical remediation technology is applied widely, Method means is many, instant effect, process capacity are large, Be very effective etc., but chemical substance need be added in soil in repair process, the secondary pollution of soil is easily caused when condition controls bad, and costly; And biological prosthetic be a kind of safer, economic repair mode, be applicable to large-area pollution amelioration, be applicable to the environmental aspect that China is current.But the onset of simple applying biological recovery technique is comparatively slow, need a starting period.
The recovery technique reported, when the acid ground carrying out heavy metal pollution is repaired, adopts quick lime, flyash, slag powders, steel-making slag powder etc. to be raw material more, and by turning over, upper soll layer mixes with repair materials by the mode such as stirring.But because the alkalescence of repair materials is high, be directly applied on soil and very easily cause alkalescence too high and uneven, the more important thing is, the absorption speed due to material is fast and moisture holding capacity is not enough, is difficult to the desirable repairing effect realizing rehabilitating soil.Therefore, a kind of repairing effect of research preparation good and improve soil fertility and ecological microenvironment, to be beneficial to the heavy metal-polluted soil in-situ immobilization conditioning materials that vegetation reclaims significant.
Summary of the invention
The object of the present invention is to provide a kind of in-situ remediation method containing heavy metal acid ground.
The technical solution used in the present invention is:
Containing an in-situ remediation method for heavy metal acid ground, comprise the following steps:
1) preparation conditioning matrix 1: useless, the particle getting autoclave aerated concrete building block, grinding is sieved, and obtains nursing one's health matrix 1;
2) preparation conditioning matrix 2: get brewery's dewatered sludge, dry, grinding is sieved, obtains nursing one's health matrix 2;
3) in-situ immobilization: according to the pH value of soil to be repaired, first uses conditioning matrix 1, turns over, stirs, and after soil pH value rises to more than 7, then adds conditioning matrix 2, again turns over, stirs; Spray water, made upper soll layer mix with repair materials and kept the moisture content that sets every day; Lasting spray water is to setting number of days.
In step 1), the grit number used that sieves is 10-30 order.
Step 2) in, the grit number used that sieves is 10-30 order.
In step 3), be raised between 7-8 at pH, then add conditioning matrix 2.
In step 3), conditioning matrix 1 is 1:(20-40 with the mass ratio of soil to be repaired).
In step 3), the mass ratio of conditioning matrix 1, conditioning matrix 2 is 1:(1-2).
In step 3), the moisture content of setting is moisture content > 80%.
In step 3), setting number of days is 15-90 days.
The invention has the beneficial effects as follows: using of conditioning matrix of the present invention, not only can regulate the acid or alkali environment of soil, active material simultaneously in matrix will and heavy metal contaminants between adsorb, ion-exchange, contact flocculation, neutralization precipitation, humification, the reactions such as redox, and then the heavy metal contaminants in passivation soil, effectively reduce the bioavailability of heavy metal, and improve the fertility of soil and ecological microenvironment, add the microbial diversity of soil, change the physics of soil, the characteristics such as chemistry and biology, improve the self-purification capacity of soil fertility and biology thereof, effectively to solve and improve the acid condition of soil and passivation heavy metal contaminants.
The conditioning matrix that the present invention adopts, all from the discarded object of production process, to be easyly easy to get, with low cost, reparation easy and simple to handle, the cycle is short, efficiently solves a difficult problem for in-situ immobilization, can create good economic benefit and social benefit.
Detailed description of the invention
Containing an in-situ remediation method for heavy metal acid ground, comprise the following steps:
1) preparation conditioning matrix 1: useless, the particle getting autoclave aerated concrete building block, crosses 10-30 mesh sieve after grinding, obtains nursing one's health matrix 1;
2) preparation conditioning matrix 2: get brewery's dewatered sludge, be dried to moisture content≤50%, ground 10-30 mesh sieve, obtains nursing one's health matrix 2;
3) in-situ immobilization: according to the pH value of soil to be repaired, first uses conditioning matrix 1, turns over, stirs, rise between 7-8 at soil pH value, then adds conditioning matrix 2, again turns over, stirs; Spray water, made upper soll layer mix with repair materials and kept the moisture content of more than 80% every day; Continue spray water 15-90 days.
In step 3), conditioning matrix 1 is 1:(20-40 with the mass ratio of soil to be repaired); The mass ratio of conditioning matrix 1, conditioning matrix 2 is 1:(1-2).
In the present invention, in autoclave aerated concrete building block used, it comprises following chemical analysis:
table 1: the chemical analysis that autoclave aerated concrete building block comprises
The characteristic of described beer dewatered sludge is as shown in table 2:
table 2 Beer Sludge (dewatered sludge) nutritional labeling
Below in conjunction with specific embodiment, the present invention is described further:
embodiment:
Under the condition of lab simulation research, get 100g artificially contaminated soil, the pH value of this soil is 6, contained Cd concentration is respectively 0.1,1.0,2,3,4mgkg
-1be placed in culture dish, add 2.7g to nurse one's health described in preparation method's detailed description of the invention part of matrix 1(conditioning matrix 1) stir afterwards, when addition to soil pH value for 7 time add 2.7g and nurse one's health matrix 2(and nurse one's health the preparation method of matrix 2 as described in detailed description of the invention part), stir and spray running water, the moisture content of soil is kept to reach more than 80%, through the reparation of 15,30,45,60 days, the exchangeable species content of the Cd in each processed group pedotheque of detection statistics.Result (each process three repetitions, results averaged) as shown in table 3.
table 3 processes the exchangeable species content of Cd in rear soil
As shown in Table 3, in each processed group pedotheque, the exchangeable species content of Cd all reduces 40 ~ 50%.
Claims (8)
1., containing an in-situ remediation method for heavy metal acid ground, it is characterized in that: comprise the following steps:
1) preparation conditioning matrix 1: useless, the particle getting autoclave aerated concrete building block, grinding is sieved, and obtains nursing one's health matrix 1;
2) preparation conditioning matrix 2: get brewery's dewatered sludge, dry, grinding is sieved, obtains nursing one's health matrix 2;
3) in-situ immobilization: according to the pH value of soil to be repaired, first uses conditioning matrix 1, turns over, stirs, and after soil pH value rises to more than 7, then adds conditioning matrix 2, again turns over, stirs; Spray water, made upper soll layer mix with repair materials and kept the moisture content that sets every day; Lasting spray water is to setting number of days;
Described autoclave aerated concrete building block comprises following chemical analysis: the SiO of 40-50%
2, 5-10% Al
2o
3, 3-8% Fe
2o
3, 20-30% the K of MgO, 0.5-1% of CaO, 0.5-1%
2the Na of O, 0.1-0.2%
2the SO of O, 0.5-1%
3.
2. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, it is characterized in that: in step 1), the grit number used that sieves is 10-30 order.
3. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, is characterized in that: step 2) in, the grit number used that sieves is 10-30 order.
4. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, is characterized in that: in step 3), is raised between 7-8 at pH, then adds conditioning matrix 2.
5. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, is characterized in that: in step 3), and conditioning matrix 1 is 1:(20-40 with the mass ratio of soil to be repaired).
6. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, is characterized in that: in step 3), and the mass ratio of conditioning matrix 1, conditioning matrix 2 is 1:(1-2).
7. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, it is characterized in that: in step 3), the moisture content of setting is moisture content > 80%.
8. a kind of in-situ remediation method containing heavy metal acid ground according to claim 1, it is characterized in that: in step 3), setting number of days is 15-90 days.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104492797B (en) * | 2014-12-09 | 2016-08-24 | 江苏盖亚环境工程有限公司 | A kind of restorative procedure of heavy metal pollution acid ground |
| CN104815841B (en) * | 2015-05-21 | 2018-07-06 | 北京泰克美高新技术有限公司 | A kind of heavy-metal contaminated soil chromatographs administering method in situ |
| CN108356069A (en) * | 2018-01-30 | 2018-08-03 | 上海岩土工程勘察设计研究院有限公司 | Polluted Soil stir in situ uniformity computational discrimination method |
| CN108398539B (en) * | 2018-01-30 | 2023-09-22 | 上海勘察设计研究院(集团)有限公司 | Polluted soil in-situ stirring uniformity evaluation method |
| CN108380650A (en) * | 2018-01-30 | 2018-08-10 | 上海岩土工程勘察设计研究院有限公司 | The points distributing method that Polluted Soil stir in situ uniformity differentiates |
| CN111229814A (en) * | 2020-02-12 | 2020-06-05 | 四川省生态环境科学研究院 | Method for in-situ remediation and risk control of alkaline contaminated soil |
| CN111699776B (en) * | 2020-06-18 | 2024-07-05 | 南京中泰平祥化工科技有限公司 | In-situ matrix improved vegetation restoration construction method for acid heavy metal mine |
| CN116159860B (en) * | 2023-03-03 | 2023-08-08 | 华南师范大学 | Restoration method for nonferrous metal mining abandoned land soil |
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| JP2000282034A (en) * | 1999-03-31 | 2000-10-10 | Sumitomo Metal Ind Ltd | Method for preventing soil acidification and for stabilizing soil ph |
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| CN101269264A (en) * | 2008-04-22 | 2008-09-24 | 南京瑞迪高新技术公司 | Method for solidifying heavy metal and soil polyalcohol composite cement special for the same |
| CN101445250A (en) * | 2008-12-05 | 2009-06-03 | 山东师范大学 | Organic matter/mineral complex and preparation method thereof |
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