CN109290357A - A kind of chemical leaching-electric repair method of heavy-metal contaminated soil - Google Patents
A kind of chemical leaching-electric repair method of heavy-metal contaminated soil Download PDFInfo
- Publication number
- CN109290357A CN109290357A CN201811085826.7A CN201811085826A CN109290357A CN 109290357 A CN109290357 A CN 109290357A CN 201811085826 A CN201811085826 A CN 201811085826A CN 109290357 A CN109290357 A CN 109290357A
- Authority
- CN
- China
- Prior art keywords
- soil
- eluent
- heavy metal
- heavy
- electrolytic cell
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- 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
-
- 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
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a kind of chemical leaching-electric repair method of heavy-metal contaminated soil, it is (3~6) that method, which includes: by mass ratio: 2:1 xylose alcohol fatty acid ester, natural organic acids, hydrolyzed maleic anhydride are mixed to prepare eluent；Eluent washed off soil is used in the electrolytic cell in electro reclamation device, eluent and soil quality ratio are (1~1.3): 1；The Acetic acid-sodium acetate buffer of pH 2~5 is added in anode chamber, the potassium nitrate solution of 0.05~2mol/L is added in cathode chamber, connects the direct current of graphite anode and graphite cathode, and heavy metal ion is recycled in cathode chamber；Heavy metal filtrate is recycled in collecting tank, filtrate can be used as eluent recycling after being electrolysed, while recycle heavy metal.The method restoration of soil polluted by heavy metal effect is good, and reparation speed is fast, and the time used is short, and method is simple and fast, and agents useful for same is safe and non-toxic, and without secondary pollution to environment, heavy metal also recoverable meets sustainable development, energy-saving and environment-friendly requirement.
Description
Technical field
The present invention relates to heavy metal technical field of soil remediation, and in particular to a kind of chemistry leaching of heavy-metal contaminated soil
Wash-electric repair method.
Background technique
The main source of heavy metal pollution of soil have the use of pesticide, trade effluent, the discharge of waste, house refuse,
Atmospheric sedimentation etc..The heavy metal of contaminated soil mainly includes the significant element of the bio-toxicities such as mercury, cadmium, lead, chromium and arsenic, heavy metal
Content is exceeded all to cause very big harm to environment, animals and plants, such as influence the development of plant roots and leaf, destroy human nerve system
System, immune system, skeletal system etc..
Common heavy metal-polluted soil recovery technique includes soil improvement by importing soil from other places, biological restoration, chemical restoration, Electroremediation
Method etc..Several restorative procedures respectively have scarce, and the effect as soil replacement method handles soil seriously polluted, that area is small is good, but engineering
It measures big and at high cost；Biological restoration safety and environmental protection not will cause secondary pollution, simple to operation, not destroy soil physico-chemical property,
But repair time is very long；Chemical restoration simple process to the contaminated soil remediation effect stability of high concentration, thoroughly, and is repaired
Multiple high-efficient, the time used is short, but the part chemical reagent used is toxic, difficult to degrade, generates secondary pollution to environment；Electric power
Repairing method, which has, operates convenient, the short advantage of repairing efficiency, and at low cost, applied widely, but for insoluble organic contamination
Object needs chemical solubilising, is also easy to produce secondary pollution.Therefore two or more restorative procedure and with can learn from other's strong points to offset one's weaknesses,
Better soil remediation effect is reached, it is also more and more to research in this respect in recent years.
A kind of restorative procedure of heavy metal nickel contaminated soil of Chinese patent (CN201510213271.X), is eluted using acetic acid
Electromotion repairing technique is carried out to soil after soil.Removal of heavy metal ions rate is high, and reagent is environment-protecting and non-poisonous, but not can be removed
Organic pollutant, metal ion sink to the bottom fouling to be formed, and decline remediation efficiency.Chinese patent (CN201610539787.8) one
Kind is used for electrodynamics-hydrodynamic seepage pressure (EK-PRB) device of field condition combined contamination soil reparation.It is easy to operate easy
Row, is not limited by place, but heavy metal separating effect is insufficient.
Summary of the invention
The present invention in view of the deficiencies of the prior art mentioned above, provides a kind of chemical leaching-electricity of heavy-metal contaminated soil
Dynamic restorative procedure, the method restoration of soil polluted by heavy metal effect is good, and reparation speed is fast, and the time used is short, and method is simple and fast,
Agents useful for same is safe and non-toxic, without secondary pollution to environment, and heavy metal also recoverable meets sustainable development, energy conservation and environmental protection
Requirement.
Technical scheme is as follows:
(1) preparation of eluent: closing the switchable partition of electro reclamation device, is (3~6): the xylitol of 2:1 by mass ratio
Aliphatic ester, 0.15~0.5mol/L natural organic acids, hydrolyzed maleic anhydride are mixed to prepare eluent；
(2) washed off soil: uniformly spraying washed off soil with eluent in the electrolytic cell of electro reclamation device, makes soil and elution
Agent completely attaches to, and eluent and soil quality ratio are (1~1.3): 1,1~2h is stood, soil reaches water saturation state；
(3) Electroremediation: the Acetic acid-sodium acetate buffer of addition pH 2~5 in anode chamber, cathode chamber addition 0.05~
The potassium nitrate solution of 2mol/L, connects the direct current of graphite anode and graphite cathode, and heavy metal ion is recycled in cathode chamber；It is electronic
Power opens the switchable partition of electro reclamation device after repairing, eluent is filtered through non-woven nylon cloth after Electroremediation and flowed into
Collecting tank obtains heavy metal filtrate in collecting tank, and heavy metal filtrate can reuse as eluent again after being electrolysed again, simultaneously
Recyclable heavy metal.
The electro reclamation device is by electrolytic cell, anode chamber, cathode chamber, collecting tank, graphite anode, graphite cathode, filter
Net A, filter membrane B, switchable partition, non-woven nylon cloth composition.
As a further explanation of the present invention, the natural organic acids is citric acid, in tartaric acid, sodium gluconate
It is a kind of.
As a further explanation of the present invention, the citric acid be 0.15~0.2mol/L, tartaric acid be 0.2~
0.3mol/L, sodium gluconate are 0.3~0.5mol/L.
As a further explanation of the present invention, the both ends of electrolytic cell are respectively anode chamber and cathode chamber；Anode chamber and electrolysis
It is strainer A between slot, strainer A is wrapped on plastic filter screen by filter paper and is made；It is filter membrane B, filter membrane B between electrolytic cell and cathode chamber
It is made of plastic wire and cation-exchange membrane；Be collecting tank below electrolytic cell, be switchable partition between electrolytic cell collecting tank with
Layer of non-woven fabric nylon cloth.
Xylose alcohol fatty acid ester is polyol-based non-ionic surfactant, safe and non-toxic, not can cause environmental pollution.
It, can be with complexation heavy metal ion due to the functional groups such as hydroxyl, carboxyl and surface-active in its its molecular structure, moreover it is possible to solubilising
With the degradation for promoting the organic pollutants such as polycyclic aromatic hydrocarbon.Its hydrophobic group makes it be adsorbed on soil mineral surface;The soil organism with
The interaction of hydrophobic carbochain has suction-operated；Hydrogen bond action and electrostatic attraction of the hydrophilic radical with soil surface.Xylitol
Aliphatic ester can be adsorbed on soil particle surface, to change solid liquid interface property, heavy metal be made to be detached from soil particle, Jin Erda
To the effect of removal heavy metal in soil.
Citric acid, tartaric acid, sodium gluconate are a kind of natural organic acids, containing multiple ligands, to the solution of heavy metal
Analysis includes the molten effect of acid and chelation.Hydrolyzed maleic anhydride is a kind of low molecular weight polyelectrolyte, and nontoxic, as a kind of gold
Belong to chelating agent, antisludging agent.
Since natural organic acids has stronger sequestering power, it may be formed and be precipitated with metal ion.Xylose alcohol fatty acid ester,
The shared not only available better sequestering power of hydrolyzed maleic anhydride, natural organic acids can also increase its solubility, prevent
Heavy metal in soil forms precipitating, and fouling blockage is caused to be difficult to the problem of removing；And three acts synergistically so that metal is accelerated
The migration rate of dissolution, ion increases, while also can increase soil conductivity, improves the electric current in electro reclamation system, reduces
The Electroremediation time.
The invention has the advantages that
1, fast using chemical leaching-electromotion repairing technique method reparation speed, the time used is short, and heavy metal removing rate is high, may be used also
Remove the organic pollutant in soil.
2, filtrate will can reuse again washed off soil, energy conservation and environmental protection by electrolysis after metal recovery.
3, agents useful for same is safe and non-toxic, biodegradable, will not cause secondary pollution to environment, will not soil fertilizer
Power can increase soil carbon source.
4, the method for the present invention is at low cost, simple to operate, uses manpower and material resources sparingly.
Specific embodiment
Embodiment 1:
(1) the switchable partition of electro reclamation device, xylose alcohol fatty acid ester, the 0.1mol/L for being 5:2:1 by mass ratio are closed
Citric acid, hydrolyzed maleic anhydride are mixed to prepare eluent；Eluent washed off soil is used in the electrolytic cell in electro reclamation device,
Eluent and soil quality ratio are 1:1；
(2) the Acetic acid-sodium acetate buffer of pH 2~5 is added in anode chamber, the potassium nitrate that 0.15mol/L is added in cathode chamber is molten
Liquid, connects the direct current of graphite anode and graphite cathode, and heavy metal ion is recycled in cathode chamber；Open electro reclamation device can
Partition is switched, recycles heavy metal filtrate in collecting tank, filtrate can be used as eluent recycling after being electrolysed, while recycle a huge sum of money
Belong to.
Embodiment 2:
(1) the switchable partition of electro reclamation device, xylose alcohol fatty acid ester, the 0.3mol/L for being 4:2:1 by mass ratio are closed
Tartaric acid, hydrolyzed maleic anhydride are mixed to prepare eluent；Eluent washed off soil is used in the electrolytic cell in electro reclamation device,
Eluent and soil quality ratio are 1.3:1；
(2) the Acetic acid-sodium acetate buffer of pH 2~5 is added in anode chamber, the potassium nitrate solution of 1.3mol/L is added in cathode chamber,
The direct current of graphite anode and graphite cathode is connected, heavy metal ion is recycled in cathode chamber；Open opening for electro reclamation device
Partition is closed, recycles heavy metal filtrate in collecting tank, filtrate can be used as eluent recycling after being electrolysed, while recycle a huge sum of money
Belong to.
Embodiment 3:
(1) the switchable partition of electro reclamation device, xylose alcohol fatty acid ester, the 0.4mol/L for being 6:2:1 by mass ratio are closed
Sodium gluconate, hydrolyzed maleic anhydride are mixed to prepare eluent；It is eluted in the electrolytic cell in electro reclamation device with eluent
Soil, eluent and soil quality ratio are 1.2:1；
(2) the Acetic acid-sodium acetate buffer of pH 2~5 is added in anode chamber, the potassium nitrate that 0.08mol/L is added in cathode chamber is molten
Liquid, connects the direct current of graphite anode and graphite cathode, and heavy metal ion is recycled in cathode chamber；Open electro reclamation device can
Partition is switched, recycles heavy metal filtrate in collecting tank, filtrate can be used as eluent recycling after being electrolysed, while recycle a huge sum of money
Belong to.
Embodiment 4:
(1) the switchable partition of electro reclamation device, xylose alcohol fatty acid ester, the 0.015mol/ for being 3:2:1 by mass ratio are closed
L citric acid, hydrolyzed maleic anhydride are mixed to prepare eluent；Eluent lessive is used in the electrolytic cell in electro reclamation device
Earth, eluent and soil quality ratio are 1:1；
(2) the Acetic acid-sodium acetate buffer of pH 2~5 is added in anode chamber, cathode chamber is added the potassium nitrate solution of 2mol/L, connects
The direct current of logical graphite anode and graphite cathode, heavy metal ion are recycled in cathode chamber；Open the switchable of electro reclamation device
Partition recycles heavy metal filtrate in collecting tank, and filtrate can be used as eluent recycling after being electrolysed, while recycle heavy metal.
Embodiment 5:
(1) the switchable partition of electro reclamation device, xylose alcohol fatty acid ester, the 0.25mol/L for being 5:2:1 by mass ratio are closed
Tartaric acid, hydrolyzed maleic anhydride are mixed to prepare eluent；Eluent washed off soil is used in the electrolytic cell in electro reclamation device,
Eluent and soil quality ratio are 1.2:1；
(2) the Acetic acid-sodium acetate buffer of pH 2~5 is added in anode chamber, cathode chamber is added the potassium nitrate solution of 1mol/L, connects
The direct current of logical graphite anode and graphite cathode, heavy metal ion are recycled in cathode chamber；Open the switchable of electro reclamation device
Partition recycles heavy metal filtrate in collecting tank, and filtrate can be used as eluent recycling after being electrolysed, while recycle heavy metal.
1 heavy-metal contaminated soil repairing effect of table
Claims (4)
1. a kind of chemical leaching-electric repair method of heavy-metal contaminated soil, it is characterised in that the restorative procedure includes following
Step:
(1) preparation of eluent: closing the switchable partition of electro reclamation device, is (3~6): the xylitol of 2:1 by mass ratio
Aliphatic ester, 0.15~0.5mol/L natural organic acids, hydrolyzed maleic anhydride are mixed to prepare eluent；
(2) washed off soil: uniformly spraying washed off soil with eluent in the electrolytic cell of electro reclamation device, makes soil and elution
Agent completely attaches to, and eluent and soil quality ratio are (1~1.3): 1,1~2h is stood, soil reaches water saturation state；
(3) Electroremediation: the Acetic acid-sodium acetate buffer of addition pH 2~5 in anode chamber, cathode chamber addition 0.05~
The potassium nitrate solution of 2mol/L, connects the direct current of graphite anode and graphite cathode, and heavy metal ion is recycled in cathode chamber；It is electronic
Power opens the switchable partition of electro reclamation device after repairing, eluent is filtered through non-woven nylon cloth after Electroremediation and flowed into
Collecting tank obtains heavy metal filtrate in collecting tank, and heavy metal filtrate can reuse as eluent again after being electrolysed again, simultaneously
Recyclable heavy metal；
The electro reclamation device by electrolytic cell, anode chamber, cathode chamber, collecting tank, graphite anode, graphite cathode, strainer A,
Filter membrane B, switchable partition, non-woven nylon cloth composition.
2. a kind of chemical leaching-electric repair method of heavy-metal contaminated soil according to claim 1, feature exist
In: the natural organic acids is one of citric acid, tartaric acid, sodium gluconate.
3. a kind of chemical leaching-electric repair method of heavy-metal contaminated soil according to claim 2, feature exist
In: the citric acid is 0.15~0.2mol/L, tartaric acid is 0.2~0.3mol/L, sodium gluconate be 0.3~
0.5mol/L。
4. a kind of chemical leaching-electric repair method of heavy-metal contaminated soil according to claim 1, feature exist
In: the both ends of electrolytic cell are respectively anode chamber and cathode chamber；It is strainer A between anode chamber and electrolytic cell, strainer A is wrapped up by filter paper
It is made on plastic filter screen；It is filter membrane B between electrolytic cell and cathode chamber, filter membrane B is made of plastic wire and cation-exchange membrane；Electricity
Solving is collecting tank below slot, is switchable partition and layer of non-woven fabric nylon cloth between electrolytic cell collecting tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085826.7A CN109290357A (en) | 2018-09-18 | 2018-09-18 | A kind of chemical leaching-electric repair method of heavy-metal contaminated soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811085826.7A CN109290357A (en) | 2018-09-18 | 2018-09-18 | A kind of chemical leaching-electric repair method of heavy-metal contaminated soil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109290357A true CN109290357A (en) | 2019-02-01 |
Family
ID=65163422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811085826.7A Withdrawn CN109290357A (en) | 2018-09-18 | 2018-09-18 | A kind of chemical leaching-electric repair method of heavy-metal contaminated soil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109290357A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453048A (en) * | 2020-11-06 | 2021-03-09 | 天津水泥工业设计研究院有限公司 | Electric in-situ remediation method for chromium-contaminated soil |
| CN114192561A (en) * | 2021-11-17 | 2022-03-18 | 广东工业大学 | Remediation method for cadmium-containing contaminated soil and application thereof |
| CN115446100A (en) * | 2022-08-17 | 2022-12-09 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green restoration method and device |
-
2018
- 2018-09-18 CN CN201811085826.7A patent/CN109290357A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112453048A (en) * | 2020-11-06 | 2021-03-09 | 天津水泥工业设计研究院有限公司 | Electric in-situ remediation method for chromium-contaminated soil |
| CN114192561A (en) * | 2021-11-17 | 2022-03-18 | 广东工业大学 | Remediation method for cadmium-containing contaminated soil and application thereof |
| CN115446100A (en) * | 2022-08-17 | 2022-12-09 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green restoration method and device |
| CN115446100B (en) * | 2022-08-17 | 2024-03-22 | 武汉大学 | In-situ reflux chemical leaching and diaphragm electrodialysis coupling green repair method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104174648B (en) | A kind of method of restoration of soil polluted by heavy metal and special equipment thereof | |
| CN1331619C (en) | Cathode acidifying electric power repairing process for heavy metal contaminated soil | |
| CN102500612B (en) | Chemical leaching restoring method for soil polluted by heavy metals | |
| CN109290357A (en) | A kind of chemical leaching-electric repair method of heavy-metal contaminated soil | |
| CN107413841A (en) | The microorganism renovation agent and restorative procedure of a kind of heavy-metal contaminated soil | |
| CN102500613B (en) | Process for restoring heavy metal contaminated soil/sludge through combining nanometer zero-valent iron with electromagnetic rake | |
| CN105567247A (en) | Heavy metal-contaminated soil remediation agent and preparation method thereof | |
| CN203304274U (en) | Device for intensively treating heavy metal contaminated soil by power-driven method | |
| CN105567248A (en) | Soil heavy metal passivator and preparation method and application thereof | |
| CN205966754U (en) | Arsenic slag contaminated sites soil electronic PRB prosthetic devices | |
| CN104741371A (en) | Contaminated land remediation method | |
| CN105542792A (en) | Heavy metal pollution soil restoration agent and application thereof | |
| CN207325582U (en) | A kind of electric power soil repair system based on solar energy | |
| CN107617637A (en) | A kind of method of chemistry of micro-organisms method renovation of heavy metal polluted soil with combined | |
| CN107639108A (en) | A kind of Ex-situ washing remediation of heavy-metal contaminated soil | |
| CN111570501A (en) | Remediation method for improving remediation effect of heavy metal contaminated soil | |
| CN102615098B (en) | Method for repairing cadmium-lead composite polluted calcareous soil | |
| CN108160698A (en) | Liquid and preparation method thereof is repaired in a kind of heavy-metal contaminated soil elution of environment-friendly high-efficiency | |
| CN109370596A (en) | A kind of in-situ passivation the reparation medicament, preparation method and application of cadmium arsenic combined pollution agricultural land soil | |
| CN108941177A (en) | It is a kind of for repairing the eluent and its application method of Cu, Pb, As combined contamination soil | |
| CN109622581A (en) | A method of Heavy Metals in Soil Contaminated is removed using magnetic modification biological charcoal | |
| CN110125158A (en) | A kind of method that low level elutes high-order extraction technique processing heavy metal in soil pollution | |
| CN103736718A (en) | Electrokinetic remediation method and device of heavy metal contaminated soil | |
| CN110947751B (en) | Device and method for restoring cadmium-polluted soil through electric auxiliary leaching | |
| CN106670220A (en) | Soil remediation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190201 |
|
| WW01 | Invention patent application withdrawn after publication |