CN105598144A - Restoration method of polluted soil - Google Patents
Restoration method of polluted soil Download PDFInfo
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- CN105598144A CN105598144A CN201610171376.8A CN201610171376A CN105598144A CN 105598144 A CN105598144 A CN 105598144A CN 201610171376 A CN201610171376 A CN 201610171376A CN 105598144 A CN105598144 A CN 105598144A
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- soil
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- contaminated soil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mycology (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Botany (AREA)
- Biomedical Technology (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a restoration method of polluted soil. The restoration method comprises the following steps: adding an extracting solution into the polluted soil to extract heavy metals in the polluted soil, planting wetland plants in the polluted soil, and obtaining the plants with enrichment of the heavy metals after one growing season. The restoration method has the advantages that the heavy metals in the soil are extracted in situ, and aquatic plants are used for absorbing the heavy metals enriched in the extracting solution, so that the aftertreatment problem of the leached liquid from soil extraction and the problem of loss of nutrient components such as nitrogen, phosphorus and potassium and the like in the soil after soil extraction are solved; and an innovative idea and an innovative path are provided for restoring the soil polluted by the heavy metals.
Description
Technical field
The invention belongs to environmental improvement technical field, be specifically related to a kind of restorative procedure of contaminated soil, be specially adapted to heavilyThe soil of serious pollution in metal small size.
Background technology
The situation is tense for China's heavy metal pollution of soil, presents arable land heavy metal pollution serious, industrial and mining area and ambient contamination thereofThe features such as aggravation and high background value regional soil heavy metals exceeding standard. Number of ways causes sending out of heavy metal pollution of soil phenomenonRaw, the exploitation of for example heavy metal, smelting, sewage irrigation, containing using of heavy metal fertilizer, agricultural chemicals, and special groundGeochemistry circulation etc. Heavy metal has the notable features such as toxicity is large, incubation period long and can be bioaccumulation, once soilContaminated by heavy metals, certainly will amplify and have a strong impact on human health by the accumulation of food chain. Meanwhile, heavy metal-polluted soil dirtDye the pollution that also can directly cause by the Transport And Transformation of himself water environment and air ambient.
The restorative procedure of heavy metal-polluted soil is numerous, but only has two kinds from fundamental way classification, once being by heavy metal-polluted soilGround immobilization or Passivation Treatment, make it change invalid state into from available state, enters food chain and periphery thereby reduce heavy metalThe risk of environment. The 2nd, utilize the method such as chemical extraction or bio-absorbable, heavy metal is removed from soil, thoroughly reduceThe total amount of heavy metal-polluted soil. Last approach does not reduce heavy metal-polluted soil total amount, in the situation that condition is suitable, and soil weightMetal has the possibility being reactivated. Then an approach, because heavy metal has been shifted out to soil, fundamentally solves a soil huge sum of moneyBelong to pollution problem.
Chemical leaching method is exactly a kind of method of effective minimizing heavy metal-polluted soil total amount. It utilizes different digestion agents to make a huge sum of moneyBelong to and move to liquid phase from solid phase of soil, and reach by the discharge of leachate the object that reduces heavy metal-polluted soil. Soil soaksThe technology of carrying is applicable to the small size soil remediation of serious pollution in heavy metal, can reach efficient, quick to heavy metal-polluted soilThe object of removing. However, still Shortcomings part of soil lixiviate removal heavy metal at present, for example, soil lixiviateImplementation process soil need to be moved away from original position, and soil extract contains the further processing of a large amount of heavy metal needs and soil soaksPutting forward the nutritional labelings such as rear Soil Nitrogen, phosphorus and potassium can run off etc. to some extent. Above-mentioned not enough can increase soil remediation cost and cause afterThe problem of the continuous agricultural nutrient deficiency of soil.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of restorative procedure of contaminated soil, by the weight in original position lixiviate soilMetal, absorb the heavy metal in enrichment leaching liquor with water plant, solved post processing problem that soil lixiviate drenches fluid andThe problem that after soil lixiviate, the nutritional labeling such as Soil Nitrogen, phosphorus and potassium can run off. For the reparation of heavy-metal contaminated soil providesArticle one, open one's minds and approach.
The technical solution adopted for the present invention to solve the technical problems is:
A restorative procedure for contaminated soil, step comprises:
A, contaminated soil is dug out and is backfilling in antiseepage heatable adobe sleeping platform after treatment;
B, digestion agent and water are made into extracting solution join in contaminated soil, make soil pH between 5-6.5, and makeSolution exceeds soil surface 5-25cm, lixiviate Heavy Metals in Contaminated Soils;
C, wetland plant is planted in contaminated soil, and make contaminated soil in water logging state, after 1 growth season, gather in the cropsThe plant of enriching heavy metal.
In described steps A, antiseepage treatment step is: barrier film on contaminated soil surrounding ground pad, and by the dirt of digging outDying soil is stacked on barrier film; Spread can natural degradation plastics thin digging out the heatable adobe sleeping platform surrounding that forms after soil and bottomFilm, after by the soil digging out again landfill in heatable adobe sleeping platform, and around heatable adobe sleeping platform, build the high enclosure wall of 0.5-1.0m, can natural degradationPlastic sheeting extends to body of wall top;
In described step B, digestion agent is organic acid and/or hydrochloric acid; Described digestion agent is pure for analyzing, the extracting solution preparingPH is 4-6; Described organic acid is selected from one or more in citric acid, malic acid, acetic acid, tartaric acid; Described soakingThe extraction time of carrying Heavy Metals in Contaminated Soils is 48-72h, maintains soil liquid pH5-6.5 constant during lixiviate;
In affiliated step C, wetland plant is iris or water hyacinth; Iris is yellow flag.
The invention has the beneficial effects as follows:
The present invention is directed to current chemical leaching method and process the deficiency of heavy-metal contaminated soil, developed a kind of soil lixiviate associating wetlandThe method of plant original position repairing heavy metal in soil, is easy to engineering construction, environmental friendliness, has following advantage simultaneously:
1) adopt the processing of biodegradable films bed course, ensure soil in-situ lixiviate, saved soil landed cost.
2) at soil leaching process, utilize wetland plant synchronously to process soil extract, solve containing after heavy metal soil extractThe problem of processing has improved efficiency simultaneously.
3) adopt not saliferous organic acid or hydrochloric acid as digestion agent, avoided the inhibition of leachate self to plant growth.
4) this method plant soil restoration cycle shorter, have that cost is low, non-secondary pollution, and plant can conserve water and soil,Increase soil fertility, and then accelerate the advantage of ecosystem self-regeneration, reach a soil huge sum of money by the results of plant simultaneouslyBelong to the object of thoroughly repairing.
Detailed description of the invention
Carry out further instruction below in conjunction with specific embodiment.
Embodiment 1
The present invention is directed to the soil that area is less, heavy metal pollution is comparatively serious and carry out, first take measures to utilize digestion agent formerPosition lixiviate, after the wetland plant repairing heavy metal in soil of planting. This working of an invention step is: the first step: first at Polluted SoilBarrier film on earth surrounding ground pad, then digs contaminated soil according to the purposes of soil after the heavy metal pollution degree of depth and reparationGo out, dig out soil and be stacked on barrier film, prevent the pollution to Soil Surrounding. Second step: form digging out after soilHeatable adobe sleeping platform surrounding and bottom spread thermoplastic starch plastic film, after by the soil digging out again landfill in heatable adobe sleeping platform, andThe high enclosure wall of heatable adobe sleeping platform top surrounding brick work 0.5m, biodegradable plastic film extends to body of wall top to do antiseepage. The 3rdStep: selecting citric acid digestion agent and water to be made into pH is 4.5 solution, solution is poured over to the heatable adobe sleeping platform of landfill contaminated soilIn, make lixiviate soil pH between 5-5.5, and make solution exceed soil surface 10cm. The 4th step: keep soil to soakCarry process 48h, maintain during this time soil liquid pH5-5.5 constant. The 5th step: select the wet of acidproof and energy enriching heavy metalGround plant yellow flag is planted in lixiviate soil, protects during this time by adding heavy metal free polluted river water, pond water or running waterHold waterlogging state. The 6th step: gather in the crops plant after 1 growth season, remove heatable adobe sleeping platform surrounding leakage proof wall.
Contaminated soil after Check processing, heavy metal in soil ion Cr, Pb, Cu, Cd concentration by 5.67mg/Kg,21.72mg/Kg, 11.43mg/Kg, 7.56mg/Kg reduce to respectively 0.51mg/Kg, 0.33mg/Kg, 1.12mg/Kg,0.23mg/Kg。
Embodiment 2
The present invention is directed to the soil that area is less, heavy metal pollution is comparatively serious and carry out, first take measures to utilize digestion agentOriginal position lixiviate, after the wetland plant repairing heavy metal in soil of planting. This working of an invention step is: the first step: first pollutingBarrier film on soil surrounding ground pad, then according to the heavy metal pollution degree of depth and after repairing the purposes of soil by contaminated soilDig out, dig out soil and be stacked on barrier film, prevent the pollution to Soil Surrounding. Second step: digging out shape after soilBecome heatable adobe sleeping platform surrounding and bottom spread thermoplastic starch plastic film, after by the soil digging out again landfill in heatable adobe sleeping platform, andAt the high enclosure wall of heatable adobe sleeping platform top surrounding brick work 0.5m, biodegradable plastic film extends to body of wall top to do antiseepage. TheThree steps: select malic acid, acetic acid, tartaric acid, hydrochloric acid digestion agent and water wiring solution-forming, malic acid, acetic acid, tartaric acid,Hydrochloric acid solution pH value is 5-6; Solution is poured in the heatable adobe sleeping platform of landfill contaminated soil, makes lixiviate soil pH at 6-6.5Between, and make solution exceed soil surface 10cm. The 4th step: keep soil leaching process 60h, maintain during this time soilPH value of solution 6-6.5 is constant. The 5th step: select wetland plant water hyacinth acidproof and energy enriching heavy metal to plant in lixiviate soilIn earth, keep waterlogging state by adding heavy metal free polluted river water, pond water or running water during this time. The 6th step:After 1 growth season, gather in the crops plant, remove heatable adobe sleeping platform surrounding leakage proof wall.
Contaminated soil after Check processing, heavy metal in soil ion Cr, Pb, Cu, Cd concentration by 5.67mg/Kg,21.72mg/Kg, 11.43mg/Kg, 7.56mg/Kg reduce to respectively 0.57mg/Kg, 0.46mg/Kg, 1.32mg/Kg,0.34mg/Kg。
Claims (7)
1. a restorative procedure for contaminated soil, step comprises:
A, contaminated soil is dug out and is backfilling in antiseepage heatable adobe sleeping platform after treatment;
B, digestion agent and water are made into extracting solution join in contaminated soil, make soil pH between 5-6.5, and makeSolution exceeds soil surface 5-25cm, lixiviate Heavy Metals in Contaminated Soils;
C, wetland plant is planted in contaminated soil, and make contaminated soil in water logging state, after 1 growth season, gather in the cropsThe plant of enriching heavy metal.
2. restorative procedure as claimed in claim 1, is characterized in that: in described steps A, antiseepage treatment step is:Barrier film on contaminated soil surrounding ground pad, is stacked in the contaminated soil digging out on barrier film; Digging out after soilSpread the heatable adobe sleeping platform surrounding forming and bottom can natural degradation plastic sheeting, after by the soil digging out again landfill in heatable adobe sleeping platform,And around heatable adobe sleeping platform, build the high enclosure wall of 0.5-1.0m, can extend to body of wall top by natural degradation plastic sheeting.
3. restorative procedure as claimed in claim 1, is characterized in that: in described step B digestion agent be organic acid and/orHydrochloric acid; Extracting solution pH is 4-6.
4. restorative procedure as claimed in claim 3, is characterized in that: described organic acid is selected from citric acid, malic acid, vinegarOne or more in acid, tartaric acid.
5. restorative procedure as claimed in claim 1, is characterized in that: when the lixiviate of described lixiviate Heavy Metals in Contaminated SoilsBetween be 48-72h, during lixiviate, maintain soil liquid pH5-6.5 constant.
6. restorative procedure as claimed in claim 1, is characterized in that: in affiliated step C, wetland plant is that Jris is plantedThing or water hyacinth.
7. restorative procedure as claimed in claim 6, is characterized in that: described iris is yellow flag.
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Cited By (23)
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| CN105935693A (en) * | 2016-05-30 | 2016-09-14 | 青岛理工大学 | Heavy-pollution site Sb in-situ and off-site coupling detoxication method |
| CN105945052A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Pb in-situ and ex-situ couplingdetoxificationmethod |
| CN105945043A (en) * | 2016-07-10 | 2016-09-21 | 中山市绿浪助剂有限公司 | Method for rapidly treating heavy metal pollution of soil |
| CN105945047A (en) * | 2016-07-10 | 2016-09-21 | 中山市绿浪助剂有限公司 | Comprehensive remediation method for soil polluted by heavy metals and application of comprehensive remediation method |
| CN105945055A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Hg in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN105945056A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavy-polluted site Cd in-situ and ectopic coupling detoxification method based on biogas residues |
| CN105945065A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Cu in-situ and ex-situ coupling detoxification method based on biogas residues |
| CN105964684A (en) * | 2016-05-30 | 2016-09-28 | 青岛理工大学 | Heavy pollution site Cd in-situ and off-site coupling detoxification method |
| CN106001088A (en) * | 2016-05-30 | 2016-10-12 | 青岛理工大学 | Pb in-situ and heterotopic coupling detoxifying method for heavily-contaminated site based on biogas residues |
| CN106001087A (en) * | 2016-05-30 | 2016-10-12 | 青岛理工大学 | Hg in-situ and heterotopic coupling detoxifying method for heavily-contaminated site |
| CN106001085A (en) * | 2016-05-30 | 2016-10-12 | 青岛理工大学 | Zn in-situ and heterotopic coupling detoxifying method for heavily-contaminated site |
| CN106040735A (en) * | 2016-05-30 | 2016-10-26 | 青岛理工大学 | Heavily-polluted site Cu in-situ and ex-situ coupling detoxifying method |
| CN106040736A (en) * | 2016-05-30 | 2016-10-26 | 青岛理工大学 | Biogas-residue-based in-situ and heterotopic coupling detoxication method for Sb of heavily-polluted site |
| CN106269831A (en) * | 2016-08-30 | 2017-01-04 | 夏百庆 | A kind of method of quick improvement heavy metal pollution of soil |
| CN106269822A (en) * | 2016-08-22 | 2017-01-04 | 李荣华 | One utilizes super enriching plant Huang gland perfume (or spice) green grass or young crops remediating heavy metal lead-contaminated soil method |
| CN107159692A (en) * | 2017-06-30 | 2017-09-15 | 中冶华天工程技术有限公司 | Heavy metal pollution place disposal system and method |
| CN107446584A (en) * | 2016-05-30 | 2017-12-08 | 青岛理工大学 | A kind of Cr VI place based on biogas residue is in situ and dystopy couples detoxification |
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| CN105935693B (en) * | 2016-05-30 | 2021-02-23 | 上海洁壤环保科技有限公司 | Sb in-situ and ectopic coupling detoxification method for heavily polluted site |
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| CN105945055A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Hg in-situ and ex-situ coupling detoxification method based on biogas residues |
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| CN105945052B (en) * | 2016-05-30 | 2020-10-27 | 青岛理工大学 | Pb in-situ and ectopic coupling detoxification method for heavily polluted site |
| CN106001087B (en) * | 2016-05-30 | 2020-10-23 | 青岛理工大学 | Hg in-situ and ectopic coupling detoxification method for heavily polluted site |
| CN107446584A (en) * | 2016-05-30 | 2017-12-08 | 青岛理工大学 | A kind of Cr VI place based on biogas residue is in situ and dystopy couples detoxification |
| CN106040735A (en) * | 2016-05-30 | 2016-10-26 | 青岛理工大学 | Heavily-polluted site Cu in-situ and ex-situ coupling detoxifying method |
| CN106040736A (en) * | 2016-05-30 | 2016-10-26 | 青岛理工大学 | Biogas-residue-based in-situ and heterotopic coupling detoxication method for Sb of heavily-polluted site |
| CN105945052A (en) * | 2016-05-30 | 2016-09-21 | 青岛理工大学 | Heavily-polluted site Pb in-situ and ex-situ couplingdetoxificationmethod |
| CN105935693A (en) * | 2016-05-30 | 2016-09-14 | 青岛理工大学 | Heavy-pollution site Sb in-situ and off-site coupling detoxication method |
| CN106001085B (en) * | 2016-05-30 | 2020-12-15 | 青岛理工大学 | Zn in-situ and ectopic coupling detoxification method for heavily polluted site |
| CN105945047A (en) * | 2016-07-10 | 2016-09-21 | 中山市绿浪助剂有限公司 | Comprehensive remediation method for soil polluted by heavy metals and application of comprehensive remediation method |
| CN105945043A (en) * | 2016-07-10 | 2016-09-21 | 中山市绿浪助剂有限公司 | Method for rapidly treating heavy metal pollution of soil |
| CN106269822A (en) * | 2016-08-22 | 2017-01-04 | 李荣华 | One utilizes super enriching plant Huang gland perfume (or spice) green grass or young crops remediating heavy metal lead-contaminated soil method |
| CN106269831A (en) * | 2016-08-30 | 2017-01-04 | 夏百庆 | A kind of method of quick improvement heavy metal pollution of soil |
| CN107159692A (en) * | 2017-06-30 | 2017-09-15 | 中冶华天工程技术有限公司 | Heavy metal pollution place disposal system and method |
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| CN109909292B (en) * | 2019-02-27 | 2021-07-23 | 安徽农业大学 | Method for repairing soil lead pollution by using enriched flower iris |
| CN110756576A (en) * | 2019-09-12 | 2020-02-07 | 金晨辉 | Soil replacement lead removal method for soil lead pollution treatment |
| CN113510144A (en) * | 2021-04-22 | 2021-10-19 | 贵州星硕铭越环保科技有限公司 | Method for treating heavy metal pollution of agricultural land in zinc smelting pollution area by soil method |
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