CN103571497A - Curing agent for treating heavy metal contaminated soil and application thereof - Google Patents
Curing agent for treating heavy metal contaminated soil and application thereof Download PDFInfo
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- CN103571497A CN103571497A CN201310485271.6A CN201310485271A CN103571497A CN 103571497 A CN103571497 A CN 103571497A CN 201310485271 A CN201310485271 A CN 201310485271A CN 103571497 A CN103571497 A CN 103571497A
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- solidifying agent
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Abstract
The invention provides a curing agent for treating heavy metal contaminated soil. The curing agent comprises the following components in percentage by weight: 30%-40% of binding material, 15%-25% of volcanic ash matter, 10%-15% of surfactant and 20%-35% of saw dust. The curing agent can more effectively stabilize heavy metal contaminants in soil, furthermore, the curing agent not only can increase the porosity of solidified bodies, but also can increase organics in a solidification system, so that the treated soil can be very good for roots of plants to breathing, can promote growth of plants and reduce water and soil erosion. The invention also provides the application of the curing agent in treatment of heavy metal contaminated soil.
Description
Technical field
The present invention relates to contaminated soil and administer technical field, particularly a kind of heavy-metal contaminated soil solidifying agent and application thereof combining with biology and environmental engineering.
Background technology
Industrialized develop rapidly along with city, there is increasing problem of environmental pollution to occur, heavy-metal contaminated soil is one of several large pollutions, this and the mankind's health problems associated is close, not only to effectively process heavy-metal contaminated soil now, also need this and wes' environmental problem to be combined together.
At present, the method for processing heavy-metal contaminated soil mainly comprises excavation, stabilization/solidifying, chemical leaching, air lift, thermal treatment, biological restoration etc.Wherein curing/stabilizing technology is compared with other recovery techniques, this technology has short, the advantage such as the scope of application is wider for the treatment of time, but conventionally adopt after solidifying agent or curing, contaminated soil after can only having small part to process is as low intensive material of construction such as roadbed, grounds, can not meet the demand combining with biological, environment project, therefore cause the utilization of resource abundant not.
Summary of the invention
The object of the invention is according to above-mentioned the deficiencies in the prior art, a kind of solidifying agent applicable to heavy-metal contaminated soil is provided, has used the heavy-metal contaminated soil after this solidifying agent is processed, not only toxicity obviously declines, and can be utilized fully by biological, environmental engineering, beautify the environment.
The application of solidifying agent described in the present invention also provides in processing heavy-metal contaminated soil.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of solidifying agent for the treatment of heavy-metal contaminated soil is provided, and by weight percentage, it is composed of the following components: gelling material 30%-40%, volcanic ash class material 15%-25%, tensio-active agent 10%-15% and sawdust 20-35%.
In preferred embodiments of the present invention, described solidifying agent, by weight percentage, composed of the following components: gelling material 35～40%, volcanic ash class material 15～20%, tensio-active agent 10-15% and sawdust 30～35%.
In the most preferred scheme of the present invention, described solidifying agent, by weight percentage, composed of the following components: gelling material 35%, volcanic ash class material 20%, tensio-active agent 15% and sawdust 30%.
In solidifying agent of the present invention, the preferred silicate cement of described gelling material.
In solidifying agent of the present invention, described volcanic ash class material preferred powder coal ash.
In solidifying agent of the present invention, the polycarboxylate water-reducer solution that described tensio-active agent preferred mass mark is 50～70%; The DH-4004 type polycarboxylate high performance water-reducing agent solution that further preferred mass mark is 60%.
Solidifying agent of the present invention can make after each described component is mixed in described ratio.
In solidifying agent provided by the invention, the calcium hydroxide that described gelling material produces through aquation can activate the active silica in volcanic ash class material, generates hydrated calcium silicate (CSH), and CSH can play effective stabilization to pollutent.In addition, the sawdust adding in solidifying agent of the present invention not only can increase the porosity of cured body, can also increase the organism in cure system, and this is conducive to breathing, the energy Promoting plant growth of root system of plant and reduces soil erosion.
The application of solidifying agent described in the present invention also provides in processing heavy-metal contaminated soil, according to the following steps operation:
1) utilize excavator to excavate the heavy-metal contaminated soil that will repair, and impurities removing;
2) solidifying agent of the present invention added in the heavy-metal contaminated soil that step 1) excavates and fully mix, adding proportion is soil quality 10～20%, preferably 15%;
3) by step 2) Soil Utilization vibroll after mixing rolls plainly, rolls rear maintenance 28 days.
Compared with prior art, solidifying agent of the present invention can play to the heavy metal contaminants in soil more effectively stabilization.In addition, solidifying agent of the present invention not only can increase the porosity of cured body, can also increase the organism in cure system, make thus soil after processing be more conducive to the breathing of root system of plant, more can Promoting plant growth and reduce soil erosion.Therefore solidifying agent of the present invention can organically combine with biotechnology to the processing of heavy-metal contaminated soil, and protection of the environment is contributed.
Embodiment
Embodiment 1
For the treatment of a solidifying agent for heavy-metal contaminated soil, it is composed of the following components: the polycarboxylate water-reducer solution 100kg that silicate cement 300kg, flyash 250kg, massfraction are 60% and sawdust 350kg.
Said components is mixed after by described weight feeding, obtain.
Embodiment 2
For the treatment of a solidifying agent for heavy-metal contaminated soil, it is composed of the following components: DH-4004 type polycarboxylate water-reducer solution 150kg and sawdust 300kg that silicate cement 400kg, flyash 150kg, massfraction are 60%.
Said components is mixed after by described weight feeding, obtain.
Embodiment 3
For the treatment of a solidifying agent for heavy-metal contaminated soil, it is composed of the following components: DH-4004 type polycarboxylate water-reducer solution 150kg and sawdust 300kg that silicate cement 350kg, flyash 200kg, massfraction are 50%.
Said components is mixed after by described weight feeding, obtain.
Embodiment 4
For the treatment of a solidifying agent for heavy-metal contaminated soil, it is composed of the following components: DH-4004 type polycarboxylate water-reducer solution 150kg and sawdust 200kg that silicate cement 400kg, flyash 250kg, massfraction are 60%.
Said components is mixed after by described weight feeding, obtain.
Application Example 1:
The application of the solidifying agent of embodiment 1 preparation in repairing certain Steel Plant's periphery heavy-metal contaminated soil
Certain Steel Plant is positioned at Shijingshan District, Beijing, and detect early stage to the heavy-metal contaminated soil of factory site periphery, and the pollutent that mainly exceeds standard of detection is that Zn, Cu, Ba, Pb, Sr(detected result are in table 1) etc., need to repair.
Utilize excavator to excavate contaminated soil, shoveling area is about 150 square metres, and excavating depth is about 1 meter, and rejects bulk foreign material.
Solidifying agent and heavy-metal contaminated soil that method according to described in the embodiment of the present invention 1 is made stir, after fully mixing, site preparation is smooth, detect place water ratio and be about 35%, meet solidifying agent aquation needs, solidifying agent addition is 15% of heavy metal contamination soil quality.
Utilize vibroll to roll, three times repeatedly, after compacting, to maintenance after the delineation of place 28 days, after 28 days, get pedotheque and carry out Leaching detection (TCLP) (detected result is in Table 1), and in soil, transplant a large amount of plants.
After 2 months, cured body surface is intact, and plant-growth is all right, illustrates that cured body can provide the required nutrient of plant-growth and edatope.
Table 1
| Heavy metal kind | Heavy metal in soil content (mg/Kg) | TCLP(mg/L) | Deionized water leaches (mg/L) |
| Ba | 227.40 | 0.65 | 0.38 |
| Cr | 46.67 | 0.15 | 0.08 |
| V | 66.66 | 0.23 | 0.14 |
| Zn | 1232.73 | 3.57 | 1.67 |
| Mn | 1214.73 | 2.79 | 2.03 |
| Pb | 152.08 | 0.43 | 0.37 |
| Sr | 108.84 | 0.35 | 0.28 |
In table 1, detected result shows, contaminated soil Leaching after solidifying agent of the present invention is processed obviously reduces, and meet its limit value in < < integrated wastewater discharge standard > > (GB8978-1996), illustrate that solidifying agent of the present invention can effectively process heavy-metal contaminated soil, reached the set goal.
Application Example 2:
By soil plantation flowers, nursery stock after solidifying agent described in the present invention and disposal methods, see its growing way, by untreated heavy-metal contaminated soil control experiment conditions such as (need be consistent) soil amount, soil moisture content, floristics and number, the plant-growth time of two groups of experiments, illumination, temperature, humidity.
After 6 months, flowers, the nursery stock of experimental group grow fine, with luxuriant foliage and spreading branches in leafy profusion, without plant wither or the phenomena of mortality; The flowers of control group, nursery stock growing way are slow, have branches and leaves yellowing phenomenon, more have minority plant dead, and soil have soil erosion situation with respect to experimental group.
Experimental result shows, soil through solidifying agent described in the present invention and disposal methods can make plant grew well, and undressed heavy-metal contaminated soil be not suitable for plant-growth, and experimental group soil after treatment contributes to reduce soil erosion situation.
Claims (9)
1. for the treatment of a solidifying agent for heavy-metal contaminated soil, it is characterized in that, by weight percentage, it is composed of the following components: gelling material 30%-40%, volcanic ash class material 15%-25%, tensio-active agent 10%-15% and sawdust 20-35%.
2. solidifying agent claimed in claim 1, is characterized in that, by weight percentage, it is composed of the following components: gelling material 35～40%, volcanic ash class material 15～20%, tensio-active agent 10-15% and sawdust 30～35%.
3. solidifying agent claimed in claim 1, is characterized in that, by weight percentage, it is composed of the following components: gelling material 35%, volcanic ash class material 20%, tensio-active agent 15% and sawdust 30%.
4. solidifying agent claimed in claim 1, is characterized in that: described gelling material is silicate cement.
5. solidifying agent claimed in claim 1, is characterized in that: described volcanic ash class material is flyash.
6. solidifying agent claimed in claim 1, is characterized in that: described tensio-active agent is that massfraction is 50～70% polycarboxylate water-reducer solution.
7. solidifying agent claimed in claim 6, is characterized in that: described poly carboxylic acid is DH-4004 type polycarboxylate high performance water-reducing agent.
8. the application of solidifying agent claimed in claim 1 in processing heavy-metal contaminated soil, is characterized in that, according to the following steps operation:
1) utilize excavator to excavate the heavy-metal contaminated soil that will repair, and impurities removing;
2) solidifying agent claimed in claim 1 added in the heavy-metal contaminated soil that step 1) excavates and fully mix, adding proportion is soil quality 10～20%;
3) by step 2) Soil Utilization vibroll after mixing roll plain, then after maintenance 28 days.
9. application claimed in claim 8, is characterized in that: step 2) described solidifying agent adding proportion is soil quality 15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310485271.6A CN103571497A (en) | 2013-10-16 | 2013-10-16 | Curing agent for treating heavy metal contaminated soil and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310485271.6A CN103571497A (en) | 2013-10-16 | 2013-10-16 | Curing agent for treating heavy metal contaminated soil and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909091A (en) * | 2014-03-31 | 2014-07-09 | 中国有色桂林矿产地质研究院有限公司 | Repairing method for heavy metal polluted soil |
| CN104891893A (en) * | 2015-05-13 | 2015-09-09 | 河海大学 | Coastal soft foundation soil solidifying and reinforcing material and application thereof |
| CN108941183A (en) * | 2018-06-29 | 2018-12-07 | 浙江九达环保设备有限公司 | For the modified heavy metal adsorption method repaired of soil pollution |
| CN109513724A (en) * | 2018-11-01 | 2019-03-26 | 西安建筑科技大学 | It is a kind of to integrate pyrolysis, multiple encapsulated utilizing method with the contaminated soil secure resourcesization that solidifys |
| CN110302491A (en) * | 2019-07-09 | 2019-10-08 | 安徽安江环保科技有限公司 | A kind of flyash curing heavy metal chelant and its preparation process |
| CN111100653A (en) * | 2018-10-26 | 2020-05-05 | 南京化学工业园环保产业协同创新有限公司 | Novel curing agent for heavy metal contaminated soil and use method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102876330A (en) * | 2012-10-10 | 2013-01-16 | 北京中科通用能源环保有限责任公司 | Curing agent for heavy metal contaminated soil restoration and heavy metal contaminated soil restoration method |
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2013
- 2013-10-16 CN CN201310485271.6A patent/CN103571497A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102876330A (en) * | 2012-10-10 | 2013-01-16 | 北京中科通用能源环保有限责任公司 | Curing agent for heavy metal contaminated soil restoration and heavy metal contaminated soil restoration method |
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| 关亮等: "不同胶结材料对重金属污染土壤的固化效果", 《环境科学研究》 * |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103909091A (en) * | 2014-03-31 | 2014-07-09 | 中国有色桂林矿产地质研究院有限公司 | Repairing method for heavy metal polluted soil |
| CN104891893A (en) * | 2015-05-13 | 2015-09-09 | 河海大学 | Coastal soft foundation soil solidifying and reinforcing material and application thereof |
| CN108941183A (en) * | 2018-06-29 | 2018-12-07 | 浙江九达环保设备有限公司 | For the modified heavy metal adsorption method repaired of soil pollution |
| CN111100653A (en) * | 2018-10-26 | 2020-05-05 | 南京化学工业园环保产业协同创新有限公司 | Novel curing agent for heavy metal contaminated soil and use method thereof |
| CN109513724A (en) * | 2018-11-01 | 2019-03-26 | 西安建筑科技大学 | It is a kind of to integrate pyrolysis, multiple encapsulated utilizing method with the contaminated soil secure resourcesization that solidifys |
| CN109513724B (en) * | 2018-11-01 | 2022-06-07 | 西安建筑科技大学 | Heat-collecting decomposition, multiple encapsulation and solidification integrated safe resource utilization method for polluted soil |
| CN110302491A (en) * | 2019-07-09 | 2019-10-08 | 安徽安江环保科技有限公司 | A kind of flyash curing heavy metal chelant and its preparation process |
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Application publication date: 20140212 |