CN103722007A - In-situ combined remediation technology for contaminated soil - Google Patents
In-situ combined remediation technology for contaminated soil Download PDFInfo
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- CN103722007A CN103722007A CN201410013435.XA CN201410013435A CN103722007A CN 103722007 A CN103722007 A CN 103722007A CN 201410013435 A CN201410013435 A CN 201410013435A CN 103722007 A CN103722007 A CN 103722007A
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Abstract
The invention discloses an in-situ combined remediation technology for contaminated soil. The in-situ combined remediation technology adopts a method for combined use of an in-situ leaching technology and an in-situ stabilization solidification technology, and comprises the following steps: feeding leaching liquid into an injection well, extracting the pollutant-containing leaching liquid through an extraction well, and treating the pollutant-containing leaching liquid in wastewater treatment equipment; after leaching, injecting a stabilization agent into a polluted region through the injection well adopted in an in-situ leaching process, and controlling the flow direction of the stabilization agent by virtue of the extraction well to realize recycling; after stabilizing, injecting a solidification agent by virtue of the injection well, isolating site pollutants from an environment, and filling soil gaps. According to the in-situ combined remediation technology, the advantages of in-situ leaching and in-situ stabilization/solidification are combined and a treatment effect is good.
Description
Technical field
The invention belongs to contaminated soil repairing and treating technical field, be specifically related to contaminated soil in-situ combination recovery technique.
Background technology
Continuous quickening along with China's industrialization and urbanization process, Soil Environmental Pollution problem is increasingly severe, polluted farmland soil approximately 10%, enterprises remove carryover contamination place reaches hundreds thousand of hectares, Sustainable Use of Soil Resources and agricultural product ecological safety have been formed to threat, and the improvement of contaminated site is extremely urgent.Soil remediation can be divided into original position reparation and showering by place, and showering not only processing cost is high, and be difficult to administer all contaminated places of deep soil and underground water.Therefore, develop multiple based technique for in-situ remediation and there is good actual application prospect.
It is that soil in-situ is processed the most frequently used technology that Soil leaching and stabilisation are solidified.Original position soil drip washing applies eluent by injector well etc. to soil, makes its infiltration downwards through pollutant and interacts with it, and the combination of eluent pollutant, forms transportable state compound by the effects such as desorb, dissolving or complexing are final.The solution that contains pollutant can be collected, store by modes such as extracting well, more further processes, with again for the treatment of contaminated soil.Original position stabilisation/solidification technology refers to does not need contaminated soil to dig out from place, but directly by stabilisation/solidifying medicament injects contaminated soil, stabilisation/curing technology has comprised two concepts: wherein, stabilisation is to be reacted and make it in metastable state with the stabilization agent adding by pollutant; Curing referring to wraps up pollutant, makes it to be graininess or large block existence, and then reduces the risk that pollutant is working the mischief to environment.
Independent use original position drip washing and original position stabilisation/solidify can not reach good treatment effect.Original position drip washing can thoroughly clear the pollution off, initial stage can be taken away a large amount of pollutants, but the later stage is taken away because fine grained in soil is leached liquid, can form water stream channel, cause leacheate to form short circuit, be accumulated in hypotonicity pollutant in soil simultaneously and be difficult to be removed, drip washing effect can be worse and worse.Original position stabilisation/curing contaminant reducing toxicity and mobility, and by pollutant and external environment isolation, but just temporarily changed form of poluttants, thoroughly do not remove and pollute, while adopting original position to inject stabilisation/curing medicament, processing procedure is subject to the inhomogeneous impact of soil permeability, and stabilisation/curing medicament is difficult to have influence on the soil horizon of hypotonicity.The present invention proposes, by original position drip washing and original position stabilisation/curing United Technologies, when two kinds of technology of performance a little, to make up deficiency separately.
Summary of the invention
(1) technical problem that will solve
In order to address the above problem, the present invention proposes a kind of contaminated soil in-situ combination recovery technique, adopts original position drip washing and original position stabilisation to solidify associating use, combines original position drip washing and original position stabilisation/curing advantage, made up again its deficiency separately, treatment effect is better.Original position drip washing can be removed a large amount of pollutants in high osmosis soil, but can not well act on hypotonicity soil, therefore carry out original position stabilisation, residual contaminants in hypotonicity soil is carried out to stabilisation, finally carrying out the isolated pollutant of in-situ solidifying contacts with external environment, solidify on the one hand stabilization agent is sealed up for safekeeping in soil, for long term in hyposmosis pollutant in soil, curing agent can be filled because drip washing produces interstices of soil on the other hand, ensures the security and stability in place.
(2) technical scheme
A kind of contaminated soil in-situ combination recovery technique of the present invention, adopts original position drip washing and original position stabilisation to solidify associating use, comprises following several step:
(1) soil in-situ drip washing:
(1.1) toward injecting into well, send drip washing liquid, utilize leacheate self gravitation to flow through contaminated soil, by leacheate dissolved contaminants;
(1.2) out well is extracted the leacheate that contains pollutant out, is collected in sewage disposal device;
(1.3) at sewage disposal device, process the leacheate containing pollutant, and return to step (1.1) and recycle;
(2) soil in-situ stabilisation:
(2.1) original position drip washing finishes, and the Injection Well that stabilization agent is adopted by original position drip washing injects Polluted area;
(2.2) utilize out well to control stabilization agent and flow to, remaining in pollutant in soil, be converted into stable form, stabilization agent returns to step (2.1) and recycles;
(3) soil in-situ solidifies;
(3.1) after original position stabilisation finishes, utilize Injection Well to pour into curing agent, isolated contaminated sites thing and environmental exposure, filling soil space.
As preferably, in step (1.3), described out well leachate contamination substrate concentration drops to after predeterminated target, and original position drip washing finishes.
As preferably, in step (2.2), the leachate contamination substrate concentration that current are collected after by contaminated soil reaches after goal-selling value, and original position stabilisation finishes.
(3) beneficial effect
The present invention compared with prior art, it has following beneficial effect: a kind of contaminated soil in-situ combination recovery technique of the present invention, be about to original position drip washing and original position stabilisation/curing technology and combine use, its situ stabilisation/curing original position stabilisation and in-situ solidifying two steps of being divided into.The method combines original position drip washing and original position stabilisation/curing advantage, made up again its deficiency separately, treatment effect is better: 1. original position drip washing can be taken away most of pollutant, the path that fine grained is pulled away formation in lessivation can be used as stabilisation/solidify the passage of medicament just, makes stabilisation solidify pharmacy effect in hypotonicity soil; 2. the small part pollutant that original position static stabilization can not be removed in original position drip washing, by injecting the form that exists of stabilization agent conversion pollutant, reduces mobility and the biologically active of pollutant; 3. in-situ solidifying not only can completely cut off contaminated sites thing and environmental exposure, and curing agent can fill because drip washing produces interstices of soil, ensures the security and stability in place.
The specific embodiment
Embodiment:
Take certain pollution of chromium place is example, the about 220m of pollution range length, and wide about 25m, the about 6m of thickness, groundwater level is greatly about 4-8m left and right, and contaminated soil of site is prepared leachate according to HJ/T299, and leachate hexavalent chromium concentration scope is 1.5～65mg/L.Specific embodiments is as follows:
(1) soil in-situ drip washing:
(1.1) toward injecting into well, send drip washing liquid, utilize leacheate self gravitation to flow through contaminated soil, by leacheate, dissolve Cr (VI), the pollutant in soil is transferred in liquid phase and accelerated in soil;
(1.2) out well is extracted the leacheate that contains pollutant out, is collected in sewage disposal device;
(1.3) at sewage disposal device, process the leacheate containing pollutant, and return to step (1.1) and recycle, through after drip washing repeatedly, out well percolate Cr (VI) concentration drop to initial concentration 80% after, when the amplitude of variation of front and back three Cr (VI) concentration is no more than 5%, original position drip washing finishes;
(2) soil in-situ stabilisation:
(2.1) original position drip washing finishes, and the Injection Well that stabilization agent is adopted by original position drip washing injects Polluted area;
(2.2) utilizing out well to control stabilization agent flows to, remaining in Cr in soil (VI), be reduced to comparatively stable Cr (III), form compound hard to tolerate, thereby reduced animal migration and the bioavailability of chromium in environment, returning to afterwards step (2.1) recycles, the percolate Cr (VI) collecting after current are by contaminated soil reaches after 0.1mg/L, and original position stabilisation finishes;
(3) soil in-situ solidifies;
(3.1) after original position stabilisation finishes, utilize Injection Well to pour into curing agent, isolated contaminated sites thing and environmental exposure, filling soil space, prevents that place from subsiding.
A kind of contaminated soil in-situ combination recovery technique of the present invention, closed original position drip washing and original position stabilisation/curing advantage, made up again its deficiency separately, treatment effect is better: 1. original position drip washing can be taken away most of pollutant, the path that fine grained is pulled away formation in lessivation can be used as stabilisation/solidify the passage of medicament just, makes stabilisation solidify pharmacy effect in hypotonicity soil; 2. the small part pollutant that original position static stabilization can not be removed in original position drip washing, by injecting the form that exists of stabilization agent conversion pollutant, reduces mobility and the biologically active of pollutant; 3. in-situ solidifying not only can completely cut off contaminated sites thing and environmental exposure, and curing agent can fill because drip washing produces interstices of soil, ensures the security and stability in place.
Embodiment recited above is described the preferred embodiment of the present invention, not the spirit and scope of the present invention is limited.Do not departing under the prerequisite of design concept of the present invention; various modification and improvement that this area ordinary person makes technical scheme of the present invention; all should drop into protection scope of the present invention, the technology contents that the present invention asks for protection, is all documented in claims.
Claims (3)
1. a contaminated soil in-situ combination recovery technique, is characterized in that: adopt original position drip washing and original position stabilisation curing technology to combine the method for use, comprise following several step:
(1) soil in-situ drip washing:
(1.1) toward injecting into well, send drip washing liquid, utilize leacheate self gravitation to flow through contaminated soil, by leacheate dissolved contaminants;
(1.2) out well is extracted the leacheate that contains pollutant out, is collected in sewage disposal device;
(1.3) in sewage disposal device, process the leacheate containing pollutant, and return to step (1.1) and recycle;
(2) soil in-situ stabilisation:
(2.1) original position drip washing finishes, and the Injection Well that stabilization agent is adopted by original position drip washing injects Polluted area;
(2.2) utilize out well to control stabilization agent and flow to, remaining in pollutant in soil, be converted into stable form, stabilization agent returns to step (2.1) and recycles;
(3) soil in-situ solidifies;
(3.1) after original position stabilisation finishes, utilize Injection Well to pour into curing agent, isolated contaminated sites thing and environmental exposure, filling soil space.
2. contaminated soil in-situ combination recovery technique according to claim 1, is characterized in that: in step (1.3), described out well percolate concentration drops to after predeterminated target, and original position drip washing finishes.
3. contaminated soil in-situ combination recovery technique according to claim 1, is characterized in that: in step (2.2), after the leachate contamination substrate concentration that current are collected after by contaminated soil makes it, original position stabilisation finishes.
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| CN201410013435.XA CN103722007B (en) | 2014-01-13 | 2014-01-13 | A kind of contaminated soil in-situ combination restorative procedure |
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Cited By (9)
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| CN104174647A (en) * | 2014-09-16 | 2014-12-03 | 陈岳芹 | In-situ remediation method for soil polluted by biological polypeptide product production wastewater |
| CN104624624A (en) * | 2014-12-19 | 2015-05-20 | 湖南凯天重金属污染治理工程有限公司 | Method for restoring severe chromium contaminated soil through in-situ elution and curing-stabilizing |
| CN106890847A (en) * | 2017-04-06 | 2017-06-27 | 苏州尚梵斯科技有限公司 | A kind of soil repair system and method based on process integration |
| CN106903152A (en) * | 2017-03-15 | 2017-06-30 | 湖南农业大学 | One kind separates mineral material or soil surface method of protein |
| CN107282620A (en) * | 2017-08-11 | 2017-10-24 | 北京高能时代环境技术股份有限公司 | Multiple-layer horizontal well washed off soil restorative procedure and device in situ |
| CN107903903A (en) * | 2017-11-14 | 2018-04-13 | 四川长虹格润再生资源有限责任公司 | A kind of solidification and stabilization medicament for being used to repair beryllium pollution soils and sediments |
| CN108817060A (en) * | 2018-08-03 | 2018-11-16 | 王子豪 | The method of efficient restoration of soil polluted by heavy metal |
| CN109809657A (en) * | 2019-03-27 | 2019-05-28 | 煜环环境科技有限公司 | A kind of sludge containing heavy metal processing disposition integrated approach |
| CN112934938A (en) * | 2021-01-29 | 2021-06-11 | 国网河北省电力有限公司衡水供电分公司 | In-situ leaching repairing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104174647A (en) * | 2014-09-16 | 2014-12-03 | 陈岳芹 | In-situ remediation method for soil polluted by biological polypeptide product production wastewater |
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| CN104624624A (en) * | 2014-12-19 | 2015-05-20 | 湖南凯天重金属污染治理工程有限公司 | Method for restoring severe chromium contaminated soil through in-situ elution and curing-stabilizing |
| CN106903152A (en) * | 2017-03-15 | 2017-06-30 | 湖南农业大学 | One kind separates mineral material or soil surface method of protein |
| CN106903152B (en) * | 2017-03-15 | 2020-02-11 | 湖南农业大学 | Method for separating mineral material or soil surface protein |
| CN106890847A (en) * | 2017-04-06 | 2017-06-27 | 苏州尚梵斯科技有限公司 | A kind of soil repair system and method based on process integration |
| CN106890847B (en) * | 2017-04-06 | 2018-05-01 | 浙江益壤环保科技有限公司 | A kind of soil repair system and method based on process integration |
| CN107282620A (en) * | 2017-08-11 | 2017-10-24 | 北京高能时代环境技术股份有限公司 | Multiple-layer horizontal well washed off soil restorative procedure and device in situ |
| CN107903903A (en) * | 2017-11-14 | 2018-04-13 | 四川长虹格润再生资源有限责任公司 | A kind of solidification and stabilization medicament for being used to repair beryllium pollution soils and sediments |
| CN108817060A (en) * | 2018-08-03 | 2018-11-16 | 王子豪 | The method of efficient restoration of soil polluted by heavy metal |
| CN109809657A (en) * | 2019-03-27 | 2019-05-28 | 煜环环境科技有限公司 | A kind of sludge containing heavy metal processing disposition integrated approach |
| CN112934938A (en) * | 2021-01-29 | 2021-06-11 | 国网河北省电力有限公司衡水供电分公司 | In-situ leaching repairing method |
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Inventor after: Han Qingjie Inventor after: Guo Bei Inventor after: Wang Tingtao Inventor after: Sun Guang Inventor after: Chen Feng Inventor after: Jia Shijie Inventor before: Han Qingjie |
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Effective date of registration: 20170627 Address after: 266000 Shandong province Qingdao city Yanan Road No. 39 Patentee after: QINGDAO XINTIANDI ENVIRONMENTAL PROTECTION CO., LTD. Address before: Yanan City, Shandong province Qingdao City Road 266000 No. 39 Patentee before: Han Qingjie |
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