CN106881345A - The EK PRB combined remediation methods and its device of heavy metal Cr (VI) contaminated soil - Google Patents
The EK PRB combined remediation methods and its device of heavy metal Cr (VI) contaminated soil Download PDFInfo
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- CN106881345A CN106881345A CN201710147768.5A CN201710147768A CN106881345A CN 106881345 A CN106881345 A CN 106881345A CN 201710147768 A CN201710147768 A CN 201710147768A CN 106881345 A CN106881345 A CN 106881345A
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- prb
- soil
- caal
- ldh
- heavy metal
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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
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
Abstract
The present invention relates to a kind of EK PRB combined remediation methods of efficient process heavy metal chromium (VI) contaminated soil, under the conditions of certain moisture content, this method relies on dynamic electricity to repair (EK), and combine permeable reactive barrier (PRB) technology, combine d bioremediation heavy metal in soil Cr (VI).Material in the permeable reactive barrier (PRB) being related in the present invention is layered double-hydroxide CaAl LDH.Cr (VI) effectively can be carried out enrichment concentration by electrokinetic technique in the inventive method, and layered double-hydroxide CaAl LDH have preferably absorption fixation to Cr (VI).Repaired using layered double-hydroxide CaAl LDH as the dynamic electricity of the PRB of reaction medium auxiliary so that migrate to the Cr of anode (VI) to pollute and fix, improve the operability of electrokinetic technique, and in the actual repair for being expected to apply to other anion in soil.The inventive method have it is safe and reliable, it is easy to operate, the advantages of with low cost.The layered double-hydroxide CaAl LDH in the present invention can regenerate within the scope of certain temperature and return to original layer structure reuse in addition.
Description
Technical field
The present invention is a kind of EK-PRB combined remediation methods of efficient process heavy metal chromium (VI) contaminated soil, belongs to soil
Pollutant abatement technology field, is related to a kind of EK-PRB combined remediation technologies of heavy-metal contaminated soil.
Background technology
To 2012, national contaminated arable area was 1.5 × 109Mu, causes because sewage is poured
About the 3.25 × 10 of pollution7Mu, ruins field and solid waste stores up occupation of land about 2 × 106Mu, total accounts for the whole nation can plough the land used gross area
More than 10%, land pollution and its serious, because heavy metal pollution of soil and caused by crop production reduction be up to 1 × 107Ton, by weight
The grain of metallic pollution up to 1.2 × 107Ton, 20,000,000,000 yuan or so of direct economic loss.
Animal migration of the heavy metal in soil is poor, with the residence time is long, toxicity big, it is disguised strong the features such as, from length
From the point of view of remote, it might even be possible to be enriched with by food chain, finally jeopardize the life and health of the mankind.Due to the washing away of earth's surface river, invade
Erosion and the metallic pollution material in polluted soil moved into the fresh water such as river, lake and underground water source, the life of the mankind
Deposit and threatened by serious.
The recovery technique of current chromium-polluted soil mainly has：Heavy metal pollution of soil, fixation-stabilisation, chemical reduction method, Chemical cleaning
Method etc..But it is particularly simultaneous in different shape chromium pollutant due to differences such as soil constitution, pollutant type, properties
In the case of combined pollution, traditional recovery technique is often difficult to fast and efficiently reach reparation purpose.Traditional heavy metal pollution
There is high cost in soil remediation method, destroy soil texture and fertility, easily cause secondary pollution, big to soil environment disturbance etc. all
Many shortcomings.Dynamic electricity repairing method has labor intensive few, and contact harmful substance is few, and simple to operate, secondary pollution is small, and removal effect is good
The advantages of, had a good application prospect in terms of chromium-polluted soil is repaired.
The content of the invention
It is an object of the invention to provide a kind of method of efficient process heavy metal in soil Cr (VI) pollution.
A kind of EK-PRB combined remediation methods of heavy metal Cr (VI) contaminated soil, it is characterised in that have following process and
Step：
A. the preparation containing Cr (VI) simulating pollution soil：Soil clean under natural environment is removed into larger impurity particle, warp
Ground 20 mesh sieve after natural air drying, afterwards with containing Cr (VI) solution 10:1 mixes, by evenly mixing rear ground 20 mesh sieve
Son, and be put in dry ventilation ageing 30d it is standby.It is 1000mg (Cr)/kg to prepare the aimed concn containing Cr (VI) contaminated soil
(soil).
B. the preparation of the layered double-hydroxide CaAl-LDH in permeable reactive barrier (PRB)：Weigh the calcium chloride of 5.55g
It is added in 50ml distilled water with the Aluminium chloride hexahydrate of 6.04g and is made into mixed solution, the solution is imported 100ml, 1.5 mol/L
Sodium hydroxide solution in, the magnetic agitation 1h under conditions of logical nitrogen is then sealed, and continues magnetic agitation 23h, and stirring terminates
After carry out suction filtration, wash and dry, drying solid-like is washed again, then dried under the conditions of 105 °, drying sample is through grinding
Honed 100 mesh sieve is standby.
C. repair process process：Cr (VI) contaminated soil for preparing is filled into the simulation dress used by EK-PRB combine d bioremediations
In putting, after soaking 24h under the conditions of certain moisture content, graphite electrode is connected with dc source, and be arranged on certain electricity
Under the conditions of pressure.The consistent of moisture content is kept in experiment running.The double hydrogen-oxygens of stratiform in experiment in permeable reactive barrier (PRB)
The fixed Cr (VI) of compound CaAl-LDH absorption, can use Na at a certain temperature2CO3Solution is regenerated, after regeneration
Material can be used as reaction filler again, and the Cr (VI) for being bound seizure can further concentration extraction.Described is certain
Moisture content is 20%-30%；Described voltage of electric field is 30-60V；Described uniform temperature is 410-580 DEG C.
A kind of special purpose device used by the EK-PRB combined remediation methods of heavy metal Cr (VI) contaminated soil, it is characterised in that
It is made up of the earth pillar containing chromium of dc source, graphite electrode, nylon cloth, permeable reactive barrier and container central filler；Leaning in addition
Clean soil is filled with nearly apparatus container two ends.
It is an advantage of the current invention that under laboratory conditions, Cr (VI) contaminated soil to preparing simulates virtual condition
Under it is dynamic electricity repair, without being separately provided negative and positive the two poles of the earth electrolytic cell, ensure the certain moisture content of soil under conditions of, directly stone
In the electrode ink soil to be repaired of insertion.In addition combined with permeable reactive barrier technology (PRB), under electric field action containing chromium
The seizure that heavy metal anion is oriented, reduces dynamic electricity and repairs subsequent treatment cost, and CaAl-LDH can also regenerate
Recycling.The present invention is a kind of efficient, safety, the processing method of quick soil Cr pollutions.
Brief description of the drawings
Fig. 1 is a special purpose device schematic diagram of the inventive method.
Fig. 2 is the clearance change schematic diagram of point A1.
Specific embodiment
After now specific embodiment of the invention is described in.
Embodiment
The specific size and experimental process parameters of the present embodiment, experimental conditions are as described below：
A. the size of the present apparatus is：Length × width × height=350 × 100 × 100（mm）, permeable reactive barrier body thickness is 10mm, in
Between fill earth pillar be 300 × 100 × 100（mm）, graphite electrode board size is 100 × 100 × 4 (mm), in addition near experiment
20 × 100 × 100 at device two ends（mm）It is to be filled with clean soil.
B. it is connected with dc source by graphite electrode and single condctor, dc source adjustable extent is 30-60V, experiment
During in holding meanss the moisture content of soil be 20%-30%.The soil of central filler is 1078mg/kg containing Cr (VI) concentration,
The permeable reactive barrier of 5g layered double-hydroxide CaAl-LDH reaction mediums is filled with anode tap in earth pillar.
C. under the voltage conditions of 30V, the cycle of operation is 5d, is reacted on middle earth pillar surface since anode every 12h
Region, a sampled point is set every 50mm, is named as A1, and A2, A3, A4, A5, sampling quality are maintained at 200-500mg.Through alkali
Formula measures Cr (VI) concentration after clearing up (USEPA-3060A), so as to deduce the change of the residual volume in experimental provision.
D. by after 5d process times, by continuous detection, the residual volume of chromium is 10%-20% in middle earth pillar,
That is under the conditions of voltage is 30V, Cr (VI) clearance has reached more than 80%, meet the secondary standard of country.In experiment
Under the conditions of room, it was demonstrated that this technology can efficiently process Cr (VI) contaminated soil.
Claims (2)
1. a kind of EK-PRB combined remediation methods of heavy metal Cr (VI) contaminated soil, it is characterised in that have following process and step
Suddenly：
A. the preparation containing Cr (VI) simulating pollution soil：Soil clean under natural environment is removed into larger impurity particle, warp
From
So air-dry after ground 20 mesh sieve, afterwards with containing Cr (VI) solution 10:1 mixes, by evenly mixing rear ground 20 mesh
Sieve, and be put in dry ventilation ageing 30d it is standby, prepare containing Cr (VI) contaminated soil aimed concn for 1000mg (Cr)/
Kg (soil)；
B. the preparation of the layered double-hydroxide CaAl-LDH in permeable reactive barrier (PRB)：Weigh 5.55g calcium chloride and
The Aluminium chloride hexahydrate of 6.04g is made into mixed solution in being added to 50ml distilled water, and the solution is imported 100ml, 1.5
In the sodium hydroxide solution of mol/L, the magnetic agitation 1h under conditions of logical nitrogen is then sealed, and continues magnetic agitation 23h, is stirred
Mix and carry out suction filtration after terminating, wash and dry, drying solid-like is washed again, then dried under the conditions of 105 °, dry sample
The ground mesh sieve of mistake 100 of product is standby；
C. repair process process：Cr (VI) contaminated soil for preparing is filled into the analogue means used by EK-PRB combine d bioremediations
In, after soaking 24h under the conditions of certain moisture content, graphite electrode is connected with dc source, and be arranged on certain voltage
Under the conditions of, the consistent of moisture content is kept in experiment running, the double hydroxides of the stratiform in experiment in permeable reactive barrier (PRB)
The fixed Cr (VI) of thing CaAl-LDH absorption, can use Na at a certain temperature2CO3Solution is regenerated, after regeneration
Material can be used as reaction filler again, and the Cr (VI) for being bound seizure can further concentration extraction；Described necessarily contains
Water rate is 20%-30%；Described voltage of electric field is 30-60V；Described uniform temperature is 410-580 DEG C.
2. the special purpose device used by a kind of EK-PRB combined remediation methods of heavy metal Cr (VI) contaminated soil, it is characterised in that by
Directly
Stream power supply（1）, graphite electrode（2）, nylon cloth（3）, permeable reactive barrier（4）With the earth pillar containing chromium of container central filler
（5）Composition；Clean soil is filled with approaching device container two ends in addition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710147768.5A CN106881345A (en) | 2017-03-14 | 2017-03-14 | The EK PRB combined remediation methods and its device of heavy metal Cr (VI) contaminated soil |
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|---|---|---|---|
| CN201710147768.5A CN106881345A (en) | 2017-03-14 | 2017-03-14 | The EK PRB combined remediation methods and its device of heavy metal Cr (VI) contaminated soil |
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| CN106881345A true CN106881345A (en) | 2017-06-23 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109702008A (en) * | 2018-12-29 | 2019-05-03 | 上海大学 | The method that reducing agent/chelating agent strengthens electro reclamation arsenic chromium combined contamination soil |
| CN109821885A (en) * | 2019-03-06 | 2019-05-31 | 中新曜昂环境修复(江苏)有限公司 | The EK-PRB device of packaged type reparation combined contamination soil |
| CN109909293A (en) * | 2019-03-11 | 2019-06-21 | 上海大学 | A kind of device and method of stick electrode joint PRB technology in-situ remediation soil polluted by heavy metals |
| CN110697968A (en) * | 2019-10-17 | 2020-01-17 | 上海康恒环境修复有限公司 | Pulse current and permeable reactive barrier co-processing method for removing pollution in soil and underground water |
| CN113182349A (en) * | 2021-06-08 | 2021-07-30 | 福州大学 | Method for restoring chromium-polluted soil by utilizing electro-dynamic coupling permeation reaction wall |
| CN113651507A (en) * | 2021-09-14 | 2021-11-16 | 中国科学院南京土壤研究所 | Method for removing heavy metals in livestock and poultry manure/biogas residues and EKR-PRB coupling device |
| JP2022044528A (en) * | 2020-09-06 | 2022-03-17 | 桂林理工大学 | Repair method of arsenic-contaminated soil due to electromotive strengthening penetrative reactive wall |
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| CN109821885A (en) * | 2019-03-06 | 2019-05-31 | 中新曜昂环境修复(江苏)有限公司 | The EK-PRB device of packaged type reparation combined contamination soil |
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| CN110697968A (en) * | 2019-10-17 | 2020-01-17 | 上海康恒环境修复有限公司 | Pulse current and permeable reactive barrier co-processing method for removing pollution in soil and underground water |
| CN110697968B (en) * | 2019-10-17 | 2023-05-12 | 上海康恒环境修复有限公司 | Pulse current and permeable reactive barrier cooperative treatment method for removing pollution in soil and underground water |
| JP2022044528A (en) * | 2020-09-06 | 2022-03-17 | 桂林理工大学 | Repair method of arsenic-contaminated soil due to electromotive strengthening penetrative reactive wall |
| CN113182349A (en) * | 2021-06-08 | 2021-07-30 | 福州大学 | Method for restoring chromium-polluted soil by utilizing electro-dynamic coupling permeation reaction wall |
| CN113651507A (en) * | 2021-09-14 | 2021-11-16 | 中国科学院南京土壤研究所 | Method for removing heavy metals in livestock and poultry manure/biogas residues and EKR-PRB coupling device |
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Application publication date: 20170623 |