CN100551563C - A kind of improvement method of heavy-metal contaminated soil - Google Patents
A kind of improvement method of heavy-metal contaminated soil Download PDFInfo
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- CN100551563C CN100551563C CNB2006100468445A CN200610046844A CN100551563C CN 100551563 C CN100551563 C CN 100551563C CN B2006100468445 A CNB2006100468445 A CN B2006100468445A CN 200610046844 A CN200610046844 A CN 200610046844A CN 100551563 C CN100551563 C CN 100551563C
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Abstract
The present invention relates to the improvement method of contaminated soil, specifically a kind of improvement method of heavy-metal contaminated soil.It comprises that the surface water of subsurface stratum contaminated soil sealing isolation, top layer soil removal and replacement, contaminated soil leachate collection and cleaning topsoil is collected, guide.The present invention be fit to handle multiple complicated heavy-metal contaminated soil, and the soil after can preventing to handle causes secondary pollution to surrounding environment and underground water, reduces the ecological risk after the soil remediation, has realized the safe utilization in soil.
Description
Technical field
The present invention relates to treatment method of soil contaminated, specifically a kind of improvement method of heavy-metal contaminated soil.
Background technology
Heavy metal pollution of soil has generality, the poly-property of irreversibility and table, and the heavy metal contaminants complexity has become general environmental problem, and more and more is subjected to people's attention.Heavy metal element in the soil does not experience the process of microorganism or chemical degradation, remains in heavy metal element in the soil and seepage will take place enters underground water, perhaps by the further contaminated environment of other approach.
Usually the way that solves has dystopy reparation and original position to repair two kinds of forms, the dystopy reparation is to adopt multiple improvement methods such as chemistry, physics and biology to handle after contaminated soil is dug out again, because relating to, it cuts the earth and muck haulage, there is the processing cost height, be difficult to administers the degree of depth and pollute particularly that pollutant infiltrates to zone of saturation soil and phreatic occasion.Based technique for in-situ remediation is directly to repair contaminated soil under the condition at the scene, wherein relatively is typically: in-situ remediation methods such as chemical fixation, chemical leaching, the reparation of moving electricity, biological restoration.The basic principle of these restorative procedures and technology mainly contains two aspects: increase the confinement capabilities of soil to heavy metal by solidification, reduce the mass-transfer rate of heavy metal in soil; Or heavy metal is excluded from soil matrix by activation.But all there is deficiency in these methods: be fixed on heavy metal in the soil when environmental condition changes, still can discharge from soil; The chemical complexing agent costs an arm and a leg, and is easy to generate secondary pollution; Moving electricity reparation is subjected to that the ion of shock-absorbing capacity, soil constitution, the soil liquid of soil is formed, the influence of the ionic species of pollution metal is bigger, does not have universality; Microorganism and phytoremediation are subjected to the restriction degree of artificial and the natural cause factor bigger, poor growth, and growth cycle is long, thereby remediation efficiency is low.Therefore, adopt single processing method to be difficult to it is all removed totally, it is the developing direction of this research field that exploitation is fit to heavy metal pollution district agent, soil treatment method.
Summary of the invention
The objective of the invention is at the contaminated site contaminated area concentrate relatively, pollutant levels are higher, and characteristics that require to repair the low ecological risk in soil, back provide a kind of improvement method of heavy-metal contaminated soil.
For achieving the above object, the technical solution used in the present invention is: remove the heavy metal pollution topsoil and also change cleaning soil in the shop; Subsurface stratum is isolated; Lay underground blind pipe, guide moisture.Described underground blind pipe is located at the subsurface stratum below, is used for the guide leakage water.Lay antiseepage film between described subsurface stratum soil, topsoil, described underground blind pipe is located at below, top layer, antiseepage film top, is used for the guide surface water.Described subsurface stratum soil is isolated employing antiseepage film, concrete structures physical method, and wherein: described antiseepage film can be commercial product.Subsurface stratum soil can be handled through the curing of pollutant, and it is to add curing agent in soil that described curing is handled.Be suitable for industrial waste ground and high concentration heavy metal pollution district's soil remediation and improvement.
Technological merit of the present invention:
1. the inventive method can be handled multiple complicated heavy-metal contaminated soil, is particularly useful for the reparation and the improvement of industrial waste ground and high concentration heavy-metal contaminated soil, has remedied the deficiency of treatment technology in the past, has improved treatment effeciency.
2. adopt the soil after the inventive method is handled can not cause secondary pollution, the ecological risk after the reduction soil remediation, the safe utilization in realization soil to surrounding environment and underground water.
3. the present invention is the encapsulation process technology of heavy-metal contaminated soil, and facility is simple, and applicability is stronger, and condition can control environment.
4. the processing material source of the present invention's employing is extensive, and processing cost is low.
Description of drawings
Fig. 1 is for there being the schematic diagram of impervious barrier after encapsulating.
Fig. 2 is the schematic diagram of the no impervious barrier in encapsulation back.
Fig. 3 is that 1# monitoring point content of beary metal changes schematic diagram.
Fig. 4 is that 2# monitoring point content of beary metal changes schematic diagram.
Fig. 5 is that 3# monitoring point content of beary metal changes schematic diagram.
Fig. 6 is that 4# monitoring point content of beary metal changes schematic diagram.
Fig. 7 is industrialized enforcement schematic diagram.
Label is: 1, separation layer, 2, blind pipe, 3, the top layer, 4, subsurface stratum, 5, the 1# monitoring point, 6, the 2# monitoring point, 7, the 3# monitoring point, 8, the 4# monitoring point, 9, antiseepage film.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Remove heavy metal pollution district upper soll layer 3 and change the shop cleaning soil; Adopt separation layer 1 to isolate subsurface stratum 4; Lay underground blind pipe 2, guide moisture; Lay antiseepage film 9 between described subsurface stratum 4, top layer 3, described underground blind pipe 2 is located at 3 belows, top layer, antiseepage film 9 tops, is used for the guide surface water.
Specific implementation method (referring to Fig. 1):
1. the concrete structures physical method that adopts of separation layer 1, it is: build long 2m, wide 2m, high 1m cement pit with concrete, this cement pit top is 0.5m apart from ground level, and the bottom is not sealed.
2. be subsurface stratum 4 contaminated soils of 1.0m in cement pit bottom cover height, soil density is near former contaminated soil density; Described native soil pollutant levels are respectively Cu 734.0ppm, Pb 1030.0ppm, Zn 950.0ppm, Cd 32.66ppm.
3. lay HPDE antiseepage film 9 (commercial products) on subsurface stratum 4 contaminated soils, underground blind pipe 2 is laid on antiseepage film 9 tops, behind the collection surface water, directly drains into pipe network outward, and it is not infiltrated in subsurface stratum 4 contaminated soils.
4. cover the top layer cleaning soil above antiseepage film 9, soil density is near former cleaning soil, and the cleaning soil pollutant levels are about Cu 80.0ppm respectively, Pb 326.0ppm, Zn 278.0ppm, Cd 0.7ppm.
5. simulating nature precipitation carries out the leaching experiment, and leaching liquor is the cleaning running water, and leaching speed is 60 ± 5ml/h, and leaching 12h behind the intact 700ml of every pouring, begins leaching next time again every 12h continuously.
6. lay 4 monitoring points 5,6,7,8 in the pollution-free soil of cement pit periphery district, gather a monitoring point every 10d behind the leaching and locate pedotheque and face of land water seepage, (ICP) measures its heavy metal concentration with inductively coupled plasma atomic emission spectrometer.
Measurement result is: 1#, 2#, 3# and 4# monitoring point heavy metal content in soil substantially become, referring to Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the concentration of Cu, Pb, Zn and Cd all 80.0,326.0,278.0 and 0.7ppm about; The concentration of face of land water seepage Cu, Pb, Zn and Cd be 0.9,1.5,0.09 and 0.01ppm about, illustrate that heavy-metal contaminated soil is repaired and administered through encapsulation after, leaching can polluted underground water and surrounding environment after handling continuously.
Difference from Example 1 is: no antiseepage film 9 between top layer 3, the subsurface stratum 4, and described underground blind pipe 2 is located at subsurface stratum 4 belows, is used for the guide leakage water, and collected leakage water discharges after concentrated precipitation process decontaminates thing, referring to Fig. 2.
Gather once each monitoring point place's pedotheque and soil filtration water every 10d behind the leaching, (ICP) measures its heavy metal concentration with inductively coupled plasma atomic emission spectrometer.
Measurement result is: 1#, 2#, 3# and 4# monitoring point heavy metal content in soil substantially become, the concentration of Cu, Pb, Zn and Cd all 80.0,326.0,278.0 and 0.7ppm about.Subsurface infiltration liquid all is lower than 1.0,2.0,0.1 and 0.01ppm (referring to table 1) through the concentration of Cu, Pb, Zn and Cd after the precipitation process, after illustrating that heavy-metal contaminated soil is repaired and administered through encapsulation, leaching can polluted underground water and surrounding environment after handling continuously.
Table 1 subsurface infiltration water content of beary metal and processing back content of beary metal
Difference from Example 1 is: be to improve treatment effect, can add fixedly medicament 3% lime of pollutant in encapsulation, airtight subsurface stratum contaminated soil.
After monitoring result explanation heavy-metal contaminated soil was repaired and administered through encapsulation, leaching can polluted underground water and surrounding environment after handling continuously.
Embodiment 4
Difference from Example 2 is: be to improve treatment effect, can add fixedly medicament 3% lime of pollutant in encapsulation, airtight subsurface stratum contaminated soil.
Monitoring result is: the content of heavy metal substantially becomes in the cleaning soil, leakage water through the concentration of Cu, Pb, Zn and Cd in the outer draining after the precipitation process all 1.0,2.0,0.1 with below the 0.01ppm.After illustrating that heavy-metal contaminated soil is repaired and administered through encapsulation, leaching can polluted underground water and surrounding environment after handling continuously.
Be with the foregoing description difference: according to Polluted area size and level of ground water situation, in industrialized enforcement, adopt the embodiment in the foregoing description, build n encapsulation process pond and form grid type, separation layer can adopt antiseepage film to handle, water seepage and underground water seepage focus on the back discharging on the ground, see Fig. 7.
The monitoring result of monitoring point, many places is: after heavy-metal contaminated soil was repaired and administered through encapsulation, leaching can polluted underground water and surrounding environment after handling continuously.
Claims (4)
1. the improvement method of a heavy-metal contaminated soil, its feature comprises: remove heavy metal pollution district topsoil and cleaning soil is changed in the shop; Subsurface stratum soil is isolated; Lay underground blind pipe, guide moisture.
2. according to the improvement method of the described heavy-metal contaminated soil of claim 1, it is characterized in that: described underground blind pipe is located at subsurface stratum soil below, is used for the guide leakage water.
3. according to the improvement method of the described heavy-metal contaminated soil of claim 1, it is characterized in that: lay antiseepage film between described subsurface stratum soil, topsoil, described underground blind pipe is located at topsoil below, antiseepage film top, is used for the guide surface water.
4. according to the improvement method of the described heavy-metal contaminated soil of claim 1, it is characterized in that: subsurface stratum soil is handled through the curing of pollutant.
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| CNB2006100468445A CN100551563C (en) | 2006-06-06 | 2006-06-06 | A kind of improvement method of heavy-metal contaminated soil |
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| CNB2006100468445A CN100551563C (en) | 2006-06-06 | 2006-06-06 | A kind of improvement method of heavy-metal contaminated soil |
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| CN100551563C true CN100551563C (en) | 2009-10-21 |
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Families Citing this family (11)
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| CN101773928B (en) * | 2009-12-31 | 2011-09-07 | 东南大学 | In-situ solidification and segregation treatment method of heavy-metal industrial polluted field |
| CN102172609B (en) * | 2011-02-21 | 2013-04-10 | 中国科学院南京地理与湖泊研究所 | Ecological remediation technique for use in contamination control of phosphorite waste land |
| CN102319727B (en) * | 2011-06-21 | 2012-09-26 | 北京市环境保护科学研究院 | Ectopic coupled repairing system and method for treating organic compound contaminated soil |
| CN102350437B (en) * | 2011-07-15 | 2012-09-05 | 沈阳环境科学研究院 | Method for carrying out stabilization obstruction on soil with slight heavy metal pollution |
| CN103586273A (en) * | 2012-08-14 | 2014-02-19 | 江苏盖亚环境工程有限公司 | Method for treating contaminated soil by utilizing wedge-shape high-strength isolated leaching reaction tank |
| CN104438299B (en) * | 2013-09-23 | 2018-01-02 | 天津绿茵景观生态建设股份有限公司 | It is a kind of to be used for contaminated soil remediation and the integration unit of revegetation |
| CN104259192B (en) * | 2014-09-24 | 2016-03-02 | 长江水利委员会长江科学院 | A kind of Ecological waterscape repair system of heavy metal pollution agricultural land soil and method |
| CN106703085B (en) * | 2016-12-22 | 2019-02-05 | 上海岩土工程勘察设计研究院有限公司 | A kind of aqueous vapor collection system and its working method in Polluted Soil isolation |
| CN108726820B (en) * | 2017-04-21 | 2021-03-26 | 中国二十冶集团有限公司 | River sludge harmless in-situ treatment method |
| CN112024586B (en) * | 2020-08-05 | 2022-05-27 | 江苏山水环境建设集团股份有限公司 | In-situ solidification and restoration method for contaminated site soil |
| CN112058885A (en) * | 2020-09-04 | 2020-12-11 | 钟德仁 | Novel soil pollution control method |
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| CN1059444A (en) * | 1989-11-02 | 1992-03-18 | 天津石油化工公司化工厂 | A kind of soil improving method by using blind drains for sprinkling irrigation |
| US5570973A (en) * | 1994-07-11 | 1996-11-05 | Foremost Solutions, Inc. | Method and system for bioremediation of contaminated soil using inoculated diatomaceous earth |
| DE19643364A1 (en) * | 1996-10-09 | 1998-04-16 | Umweltforschung Grosbeeren Gmb | Process to liberate especially heavy metals from polluted soil in modular bed |
| CN1765531A (en) * | 2004-10-28 | 2006-05-03 | 刘太祥 | Water-saving type salina physics-chemistry-biology comprehensive improvement and vegetation construction technique |
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- 2006-06-06 CN CNB2006100468445A patent/CN100551563C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059444A (en) * | 1989-11-02 | 1992-03-18 | 天津石油化工公司化工厂 | A kind of soil improving method by using blind drains for sprinkling irrigation |
| US5570973A (en) * | 1994-07-11 | 1996-11-05 | Foremost Solutions, Inc. | Method and system for bioremediation of contaminated soil using inoculated diatomaceous earth |
| DE19643364A1 (en) * | 1996-10-09 | 1998-04-16 | Umweltforschung Grosbeeren Gmb | Process to liberate especially heavy metals from polluted soil in modular bed |
| CN1765531A (en) * | 2004-10-28 | 2006-05-03 | 刘太祥 | Water-saving type salina physics-chemistry-biology comprehensive improvement and vegetation construction technique |
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