CN101362146B - Chemical leaching agent and repairing method for removing heavy metal and arsenic from soil - Google Patents
Chemical leaching agent and repairing method for removing heavy metal and arsenic from soil Download PDFInfo
- Publication number
- CN101362146B CN101362146B CN2008101983936A CN200810198393A CN101362146B CN 101362146 B CN101362146 B CN 101362146B CN 2008101983936 A CN2008101983936 A CN 2008101983936A CN 200810198393 A CN200810198393 A CN 200810198393A CN 101362146 B CN101362146 B CN 101362146B
- Authority
- CN
- China
- Prior art keywords
- soil
- heavy metal
- chemical
- arsenic
- edta
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002689 soil Substances 0.000 title claims abstract description 45
- 239000000126 substance Substances 0.000 title claims abstract description 26
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 25
- 238000002386 leaching Methods 0.000 title claims abstract description 23
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 14
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 title description 2
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims abstract description 24
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000006408 oxalic acid Nutrition 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 239000003480 eluent Substances 0.000 abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052793 cadmium Inorganic materials 0.000 abstract description 6
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 6
- 239000010949 copper Substances 0.000 abstract description 6
- 229910052725 zinc Inorganic materials 0.000 abstract description 6
- 239000011701 zinc Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000011133 lead Substances 0.000 abstract description 5
- 238000010828 elution Methods 0.000 abstract description 2
- -1 etc. Chemical compound 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract 2
- 229910021529 ammonia Inorganic materials 0.000 abstract 1
- 239000013043 chemical agent Substances 0.000 abstract 1
- 238000005406 washing Methods 0.000 description 10
- 229960001484 edetic acid Drugs 0.000 description 7
- 238000005303 weighing Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 231100000749 chronicity Toxicity 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000000618 nitrogen fertilizer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 241000894007 species Species 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a chemical eluent and a restoration method thereof for eliminating heavy metal and arsenic in soil simultaneously, the chemical eluent is prepared by three chemical agents, namely, EDTA, ammonia and oxalic acid, and after the preparing process, the molarity of the EDTA and the oxalic acid are respectively 0.005 to 0.05mol/L and 0.05 to 0.5mol/L, while the molar ratio between the EDTA and oxalic acid is 1:1. The formula of the chemical eluent is simple and the effect is obvious; the heavy metals such as cadmium, copper, lead and zinc, etc., and arsenic existing in the form of negative ion in the soil can be eliminated by one time elution and the eliminating effect is good. When being used for the heavy metal polluted soil, the chemical eluent is characterized by lowcost and high restoration, etc.; the chemical eluent used by the invention can adjust parameters such as the density of the eluent, processing time and liquid-solid ratio, etc. according to differentvariety and content of the heavy metals contained in the polluted soil. The soil after the leaching treatment is washed by water, and then can be refilled in the original position; therefore, no secondary pollution can be caused.
Description
Technical field
The present invention relates to a kind of chemical leaching and restorative procedure thereof that is used for to remove simultaneously heavy metal in soil and arsenic.
Background technology
Because heavy metal pollution of soil has characteristics such as disguise, chronicity and irreversibility, just be difficult to administer in case be subjected to polluting.China is ten years in the past, and the phytoremediation technology of heavy-metal contaminated soil is because its lower cost and environmentally friendlyly caused numerous concerns.Yet the super accumulation of heavy metal plant has poor growth, biomass is low, growing environment is special, is subjected to the features such as restriction of local climate condition and available plant species, is difficult to satisfy the requirement that industrial waste ground is administered fast.Therefore, have widely that the soil drip washing technology of adaptability and rapidity is international difficult point and hot research problem always, and studied in the laboratory widely and be applied in open-air actual the improvement.
The soil elution method is to come the drip washing contaminated soil with leacheate, and the heavy metal that adsorbs or be fixed on the soil particle is dissolved, and it is recycling to reclaim leacheate then.The method of drip washing and leaching is better for the repairing effect in the area of small size heavy metal severe contamination.First large-scale soil drip washing project is finished in October, 1992 at N.J..According to the report (EPA2000) of EPA in 2000, repairing what have in the new and high technology demonstration project that 4.2% project adopts in the place of more than 600 government-fundeds is exactly soil drip washing technology.The commercial operation of comparative maturity has been arranged at the chemical leaching technology of heavy-metal contaminated soil now.
The contaminated soil that the current research person is used to study focuses mostly at the contaminated soil to a kind of or two or three heavy metal species (cadmium, copper, lead, zinc etc.), and laboratory artificial contamination's method is also usually adopted in the source of pollution.Restorative procedure to the contaminated soil that contains coexistences such as the arsenic that exists with anionic form and cadmium, copper, lead, zinc does not simultaneously then appear in the newspapers.Do not see the report of the contaminated soil that has a kind of eluent to handle simultaneously to contain the various heavy that the yin, yang ionic species exists yet.The soil drip washing Study on Technology of China is less, and all is in the laboratory lab scale stage, and demonstration project is not arranged as yet.And research also concentrates on aspect desorb or the heavy metallic activation in phytoremediation.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of chemical leaching that can remove heavy metal and arsenic simultaneously is provided.
Another object of the present invention provides the method for utilizing above-mentioned chemical leaching rehabilitating soil.
The chemical leaching that is used for removing simultaneously heavy metal in soil and arsenic of the present invention, formulated by EDTA, ammoniacal liquor and three kinds of chemical reagent of oxalic acid, the molar concentration of preparation back EDTA and oxalic acid is respectively 0.005-0.05mol/L and 0.05-0.5mol/L, and the mol ratio of EDTA and ammoniacal liquor is 1:1.The purpose of ammoniacal liquor is to make the EDTA dissolving, and the ammonium radical ion is provided.
The method of utilizing chemical leaching that soil is repaired is fairly simple, only needs add in contaminated soil chemical leaching, and at room temperature vibration is centrifugal, abandons its eluate, can remove heavy metal and arsenic simultaneously.The liquid-solid ratio of chemical leaching and contaminated soil is preferably 20 milliliters: 1 gram.
If damage ratio is more serious, drip washing repeatedly also can be adjusted the concentration of eluent, parameters such as liquid-solid ratio and processing time, and heavy metal in soil and arsenic content reach environmental safety standard.
Compared with prior art, the present invention has following beneficial effect:
1. chemical leaching agent prescription of the present invention is simple, effect is remarkable, can be simultaneously divalence such as the cadmium that exists in the soil, copper, lead, zinc or trivalent heavy metals and the arsenic that exists with anionic form there be removal effect preferably, being applied to this class heavy-metal contaminated soil, to have a cost low, characteristics such as remediation efficiency height;
2. the used chemical leaching of the present invention can have the disposable characteristics that wash out to the cadmium that exists in the soil, copper, lead, zinc, arsenic etc.;
3. the used chemical leaching of the present invention, at the difference of contained heavy metal kind of different contaminated soils and content, can be to the concentration of eluent, parameters such as processing time are carried out certain adjustment.Soil after drip washing is handled is filled out the reposition reason after clear water cleans, can not cause secondary pollution.
The specific embodiment
The invention will be further described by the following examples.
The preparation of embodiment 1 chemical leaching
(1) takes by weighing 1.46g EDTA (ethylenediamine tetra-acetic acid), pour in the 1L volumetric flask after adding that 400ml is water-soluble and separating, add the ammoniacal liquor of 3.75ml25% (percent by volume) again, when adding ammoniacal liquor, shake gently and make EDTA reach abundant dissolving.
(2) take by weighing and pour in the volumetric flask of step (1) after 6.3g oxalic acid adds that 400ml is water-soluble and separates, afterwards again constant volume to the 1L graticule, the formation chemical leaching.
Embodiment 2 soil remediation
Gather Guangzhou Nitrogenous Fertilizer Factory's former warehouse contaminated soil, heavy metal-polluted soil background content: arsenic content 74.4mg/kg, copper 325.0mg/kg, cadmium 1.73mg/kg, plumbous 254.4mg/kg, zinc 258.6mg/kg, pH=7.31.With the soil gathered natural air drying at ambient temperature, again soil is broken gently into pieces the back and crossed the 2mm sieve.Take by weighing soil after the 1g screening in centrifuge tube, add 20ml chemical leaching (embodiment 1), at room temperature vibrated 2 hours, hunting speed is 180 rev/mins, and is centrifugal again, abandons its eluate.By analysis, drip washing once to various removal rate of heavy metal is: As29.6%, Cd44.2%, Cu58.7%, Pb27.8%, Zn27.8%.To the soil after handling, add 20ml chemical leaching (embodiment 1) again, the accumulative total clearance of each heavy metal species is after the drip washing 2 times continuously: As40.1%, Cd56.7%, Cu64.9%, Pb40.4%, Zn34.9%.The content of handling each heavy metal species in the soil of back is up to state standards.
Claims (3)
1. chemical leaching that is used for removing simultaneously heavy metal in soil and arsenic, it is characterized in that by EDTA, ammoniacal liquor and three kinds of chemical reagent of oxalic acid formulated, the molar concentration of preparation back EDTA and oxalic acid is respectively 0.005-0.05mol/L and 0.05-0.5mol/L, and the mol ratio of EDTA and ammoniacal liquor is 1:1.
2. the method for utilizing the described chemical leaching of claim 1 that soil is repaired is characterized in that comprising the steps: adding chemical leaching in contaminated soil, at room temperature vibration is centrifugal, abandons its eluate.
3. restorative procedure as claimed in claim 2, the liquid-solid ratio that it is characterized in that described chemical leaching and contaminated soil is 20 milliliters: 1 gram.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101983936A CN101362146B (en) | 2008-09-12 | 2008-09-12 | Chemical leaching agent and repairing method for removing heavy metal and arsenic from soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101983936A CN101362146B (en) | 2008-09-12 | 2008-09-12 | Chemical leaching agent and repairing method for removing heavy metal and arsenic from soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101362146A CN101362146A (en) | 2009-02-11 |
| CN101362146B true CN101362146B (en) | 2011-02-16 |
Family
ID=40388854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101983936A Active CN101362146B (en) | 2008-09-12 | 2008-09-12 | Chemical leaching agent and repairing method for removing heavy metal and arsenic from soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101362146B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103084384A (en) * | 2013-01-08 | 2013-05-08 | 四川农业大学 | Application of oxalic acid in removal of soil cadmium pollution |
| CN103111463B (en) * | 2013-02-01 | 2017-10-10 | 深圳市先科环保有限公司 | The restorative procedure of heavy-metal contaminated soil |
| CN103495596A (en) * | 2013-09-24 | 2014-01-08 | 廖柏寒 | Elution method for heavy metals in soil |
| CN103611725B (en) * | 2013-11-20 | 2016-04-06 | 北京鼎实环境工程有限公司 | A kind of electronation combines with chemical leaching the method for restoration of soil polluted by heavy metal |
| CN103639191A (en) * | 2013-12-17 | 2014-03-19 | 辽宁石油化工大学 | Method for restoring zinc polluted soil by rinsing |
| CN103639187A (en) * | 2013-12-17 | 2014-03-19 | 辽宁石油化工大学 | Method for restoring zinc polluted soil with 2-hydroxyphosphonoacetic acid (HPAA) |
| CN105032910A (en) * | 2015-06-12 | 2015-11-11 | 湖南大学 | Composite eluting agent for repairing arsenic contaminated soil and application method thereof |
| CN105880274A (en) * | 2016-05-17 | 2016-08-24 | 云南民族大学 | Washing system for removing lead in polluted soil |
| CN106433674A (en) * | 2016-09-20 | 2017-02-22 | 中节能六合天融环保科技有限公司 | Heavy metal compound contaminated soil leaching remediation agent, preparation method thereof and remediation method using same |
| CN106433653A (en) * | 2016-09-22 | 2017-02-22 | 北京新源环境有限公司 | Composite eluting agent for restoring Cd and Pb contaminated soil and application method thereof |
| CN108795438B (en) * | 2018-05-02 | 2021-07-06 | 厦门翼臻环保科技有限公司 | Preparation and use method of soil heavy metal leacheate |
| CN109013682A (en) * | 2018-08-22 | 2018-12-18 | 四川西冶新材料股份有限公司 | The leach extraction method of cadmium in a kind of digestion agent and preparation method thereof and soil |
| CN108941177B (en) * | 2018-09-10 | 2019-05-07 | 江西夏氏春秋环境股份有限公司 | It is a kind of for repairing the eluent and its application method of Cu, Pb, As combined contamination soil |
| CN110484263B (en) * | 2019-07-02 | 2021-11-23 | 广东省生态环境技术研究所 | Composite leaching agent and application thereof |
| CN110479746B (en) * | 2019-07-31 | 2021-07-30 | 招商局生态环保科技有限公司 | Soil remediation and lead recovery process for lead-polluted site |
| CN112108509A (en) * | 2020-07-24 | 2020-12-22 | 中南大学 | Method for removing arsenic, cadmium and lead in field soil by using combined eluent in synergy mode |
-
2008
- 2008-09-12 CN CN2008101983936A patent/CN101362146B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101362146A (en) | 2009-02-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101362146B (en) | Chemical leaching agent and repairing method for removing heavy metal and arsenic from soil | |
| CN101362145B (en) | Chemical leaching repairing method for heavy metal contaminated soil | |
| CN103357655B (en) | A kind of composite chemical ELUTION METHOD for restoration of soil polluted by heavy metal | |
| CN103555338B (en) | The method of surfactant and chelating agen Combined Treatment lead zinc pollution and eluent thereof | |
| CN104668281B (en) | Chemical washing-plant absorbing combined repair method for cadmium heavy pollution acid soil of non-ferrous metal mining area of south China | |
| CN106825018A (en) | A kind of composite chemical ELUTION METHOD of efficient restoration of soil polluted by heavy metal | |
| CN104289515A (en) | Heavy metal contaminated soil washing method | |
| CN109796982A (en) | A kind of soil remediation stabilizer and its preparation method and application prepared by high iron tailings | |
| CN103056158A (en) | Chemical leaching method for repairing heavy metal contaminated soil | |
| CN107159701A (en) | It is a kind of at the same remove soil in arsenic antimony method | |
| CN104307866A (en) | Method for repairing soil polluted by heavy metals by using chemical oxidation enhanced chemical leaching | |
| CN103084384A (en) | Application of oxalic acid in removal of soil cadmium pollution | |
| CN109226233A (en) | Height repairs target heavy-metal contaminated soil administering method | |
| CN105441081A (en) | Eluting solution capable of restoring heavy metal-contaminated soil | |
| CN105176540A (en) | Preparation method of leacheate capable of repairing soil polluted by organic matter | |
| CN112222181A (en) | Heavy metal lead contaminated soil remediation method based on deep eutectic solvent synthesized by choline chloride and malonic acid | |
| CN113481014A (en) | Preparation and application methods of cadmium-polluted soil solid waste base passivator | |
| CN105199742A (en) | Leaching liquid for repairing soil polluted by organic matters | |
| CN103611725B (en) | A kind of electronation combines with chemical leaching the method for restoration of soil polluted by heavy metal | |
| CN102327893B (en) | Material for removing lead in heavy-metal soil leacheate as well as preparation method and application thereof | |
| CN103028598A (en) | Application of polyacrylamide in removal of soil heavy metal zinc pollution | |
| CN110899323A (en) | Method for restoring farmland heavy metal contaminated soil by combining chemical leaching and phytoremediation | |
| CN103521515B (en) | Method for restoring heavy metal contaminated soil through double-liquid-phase extraction | |
| CN104923555A (en) | Method for removing lead and zinc in contaminated soil by leaching with biologic materials | |
| CN107321298B (en) | The preparation method of modified magnetite and its application in heavy metal pollution reparation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |