CN110479746A - A kind of soil remediation and lead recovery process in lead contamination place - Google Patents
A kind of soil remediation and lead recovery process in lead contamination place Download PDFInfo
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- CN110479746A CN110479746A CN201910702954.XA CN201910702954A CN110479746A CN 110479746 A CN110479746 A CN 110479746A CN 201910702954 A CN201910702954 A CN 201910702954A CN 110479746 A CN110479746 A CN 110479746A
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- soil
- lead
- filter cake
- filtrate
- contamination place
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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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
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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
- B09C1/02—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
Abstract
The present invention relates to a kind of soil remediation in lead contamination place and lead recovery process, and grade screening, carbonization treatment, resolution process, acidic activated processing, cleaning treatment and filtrate including lead contamination place soil handle laggard quadrat resource reclaim.The soil in lead contamination place is screened, is crushed to less than after 13mm, first in carbonization Chi Zhongjing ammonium hydroxide carbonization, filter cake after separation of solid and liquid enters back into decomposing pool and decomposes through fluosilicic acid, mud sequentially enters acidic activated pond again and is activated and service sink cleaning treatment after decomposition after being separated by solid-liquid separation, filtrate is recycled after sewage disposal device is handled, and finally obtains cleaning soil and leaded filter cake.Present invention process process is simple, it is easy to accomplish.The soil in lead contamination place is after process of the invention, realize the purpose of the recycling of lead resource in the whole backfills in situ of soil and soil in lead contamination place, the secondary pollution to surrounding enviroment is avoided, the depth repairing and treating for obtaining soil for lead contamination place provides technical guarantee.
Description
Technical field
The invention belongs to contaminated soil remediations and resource recycling field, and in particular to a kind of soil in lead contamination place
It repairs and lead recovery process.
Background technique
Smelt in lead, lead storage battery production, industry plating, doped fuel use, used etc. containing lead pigments during can produce
Raw leaded waste water, exhaust gas and waste residue, lead waste water, exhaust gas and waste residue, which enter, will cause soil pollution in soil.Lead is soil
In one of the most common heavy metal contaminants, it can enter human body by animals and plants, and lead can destroy digestion body after entering human body
System is constituted, and reduces immune function of human body, is damaged neural system, marrow hemopoiesis system, digestion system, kidney and reproduction system, is led
Cause infant growth is slow, height is short, intellectual development is slow etc..Lead-contaminated soil constitutes threat to ecological safety, is badly in need of
Repairing and treating is carried out to the type contaminated soil.
The lead contamination place common technology of soil remediation has Soil leaching technology, solidification and stabilization technology, cement kiln collaboration
Disposal technology, phytoremediation technology etc., wherein solidification and stabilization technology is incited somebody to action by adding the curing agent such as stabilizer and cement
Sheath in soil is rolled in inside, reduces the bio-toxicity of lead-contaminated soil, but there is wrapping layer rupture wind as time goes by
Danger, will cause secondary pollution to environment；Cement kiln synergic processing is to send lead-contaminated soil to cement kiln, by contaminated soil in water
It is added in mud production process, this method is be transferred in cement by land pollutant, is not controlled contaminated soil
It manages, there are still the risks of secondary pollution in cement use process；Phytoremediation is to be absorbed using plant to the lead in soil,
The content of lead in soil is reduced, but this method time is longer, and does not have preferable Disposal Measures to plant after absorbing heavy metal；
Soil leaching is common recovery technique in engineering, and this method is to be rinsed with water or eluent to soil, by land pollutant
It is separated with soil.It is proposed in Li Shupeng " a kind of Soil leaching repair system and method " (2017102497807) through clear water leaching
It washes and the pollutant on coarse granule (comprising gravel, coarse sand and fine sand etc.) surface is eluted, is shifted, is concentrated into fine grained soil, contain
Fine grain mud concentrates subsequent processing at mud cake through dehydration filters pressing, elutes clean coarse granule and no longer needs to repair through detecting qualification
It can directly resource utilization utilize.
Backfill and heavy metal resources recycling are that the development of soil remediation becomes in situ after contaminated soil of site reparation cleaning
Gesture.Currently, only Soil leaching technology is able to achieve the backfill in situ of part coarse-grained soil, but elution technique can only will be sour in soil
The land pollutant of soluble state and part organic removes, and land pollutant in soil is transferred in fine-grained soil, fine-grained soil
Solidification and stabilization and dystopy landfill disposal are still needed to, is not able to achieve being completely separated for land pollutant and soil.For fine-grained soil Pb
Content is up to the place of 60%-75%, and Soil leaching technology can elute that clean coarse-grained soil is limited, and fine-grained soil still needs to again
Cured stabilization processes cause most of lead-contaminated soil to can not achieve backfill in situ, there is the secondary pollution to environment
Risk, and cause the waste of lead resource in soil.
Therefore, it is necessary to improve existing lead contamination place soil remediation, make it that can either realize coarse granule in the prior art
The backfill in situ of soil, carries out backfill in situ, while can also be to dirt after being also completely separated fine-grained soil and land pollutant
Lead in dye object is recycled.
Summary of the invention
In view of this, being reached the purpose of the present invention is to provide a kind of soil remediation in lead contamination place and lead recovery process
To the purpose that processed soil is carried out to backfill in situ and lead resource recycling.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of soil remediation and lead recovery process in lead contamination place, the technique include:
(1) the soil separate screening and break process in lead contamination place, obtain the soil greater than 100mm grade and be less than etc.
In the soil of 13mm grade；
(2) soil for being less than or equal to 13mm grade described in step (1) is subjected to carbonization treatment, is obtained by sedimentation centrifugation
Filter cake I；
(3) resolution process is carried out to the filter cake I in step (2), obtains filter cake II and filtrate II by sedimentation centrifugation:
(4) acidification is carried out to the filter cake II in step (3), obtains filter cake III and filtrate III by sedimentation centrifugation:
(5) cleaning separating treatment is carried out to the filter cake III in step (4), obtains filter cake IV and filtrate IV, the filter cake IV
As cleaning soil:
(6) filtrate obtained in step (3)~(5) is subjected to sewage treatment, after treatment is separated by solid-liquid separation to obtain
Filter cake V and filtrate V, the filter cake V are lead salvage material.
Preferably, the soil separate screening and break process in lead contamination place described in step (1) specifically:
(1) soil in the lead contamination place is fed circular shale shaker to sieve, the soil of 100mm grade is greater than on sieve
I enters soil coarse grained working area, enters in rotary screen under sieve less than or equal to 100mm grade soil and carries out wet screening, obtains rotary screen
The soil II and rotary screen sieve for sieving upper 100~13mm grade descend to be less than or equal to the soil III of 13mm grade, during the wet screening
With circulating water flushing soil；
(2) so that soil II is entered hammer mill, rotary screen is back to after broken and carries out wet screening, be repeated until described
Soil II is all as the lower soil IV less than or equal to 13mm of rotary screen sieve.
Preferably, carbonization treatment described in step (2) specifically: 13mm grade will be less than or equal to described in step (1)
Soil enters in carbonization pond, is continuously added into the NH of 0.2mol/L4The aqueous solution of OH carries out 1~2h of carbonization, carries out after carbonization
Sedimentation centrifugation, respectively obtains filter cake I and filtrate I.
Preferably, resolution process described in step (3) specifically: filter cake I described in step (2) enters in decomposing pool, holds
The continuous H that 0.15mol/L is added2SiF6Aqueous solution carry out 1~2h of decomposition, carry out sedimentation centrifugation after decomposition, respectively obtain filter
Cake II and filtrate II.
Preferably, acidification described in step (4) specifically: filter cake II described in step (3) enters acidic activated pond
In, it is continuously added into the HNO of 0.1mol/L3Aqueous solution carry out 1~2h of acidification, carry out sedimentation centrifugation after acidification, point
Filter cake III and filtrate III are not obtained.
Preferably, separating treatment is cleaned described in step (5) specifically: filter cake III described in step (4) enters service sink
It is middle to carry out 0.5~1h of cleaning with recirculated water, diaphragm filter press is entered after cleaning and carries out separating treatment, obtains filter cake IV and filter
Liquid IV, the filter cake IV enter cleaning soil working area.
Preferably, the volume mass of the liquid and solid ratio in pond that is carbonized during the carbonization treatment is not less than 10:1, institute
The volume mass of liquid and solid ratio is stated during resolution process in decomposing pool not less than 10:1, acid during the acidification
Property activating tank in the volume mass of liquid and solid ratio be not less than 10:1, liquid in cleaning separating treatment Cleaning Process pond
It is not less than 10:1 with the volume mass ratio of solid, the unit of the volume mass ratio is mL:g.
Preferably, sewage treatment described in step (6) specifically: filtrate II obtained in step (3)~(5), filtrate III
It is handled with filtrate IV into sewage disposal device, obtains overflow and bottom liquid, the overflow enters circulating water pool and recycled
It utilizes, the bottom liquid enters filter press and is separated by solid-liquid separation, and obtains filter cake V and filtrate V, it is temporary that the filter cake V enters lead cake
Area, the filtrate V repeat aforesaid operations into sewage disposal device.
Preferably, it is that pH adjusts and adjust the sewage treatment that NaOH is added in sewage disposal device described in step (6)
PH value in equipment is 8~10, and addition PAM is flocculant.
The beneficial effects of the present invention are:
1, the invention discloses a kind of soil remediation in lead contamination place and lead recovery process, including lead contamination place soil
Grade screening, the carbonization treatment of soil, resolution process, acidic activated processing, cleaning and filtrate handle laggard quadrat resource
Recycling.The purpose for realizing the recycling of lead resource in the whole backfills in situ of soil and soil in lead contamination place, avoids
Secondary pollution to surrounding enviroment, the depth repairing and treating for obtaining soil for lead contamination place provide technical guarantee.
2, the process flow of the soil remediation and lead recovery process in a kind of lead contamination place disclosed by the invention is simple, is easy to
Realize, by adopting the above technical scheme handle lead contamination place soil, can thoroughly remove organic in soil, Fe-Mn oxide and
The land pollutant of residual form, lead content can be reduced to construction land soil pollution risk screening value hereinafter, solving in soil
Land pollutant in soil and soil cannot be completely separated the problem of wasting with lead resource in soil in the prior art.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target of the invention and other advantages can be realized by following specification and
It obtains.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, in which:
Fig. 1 is the flow chart of the soil remediation and lead recovery process in a kind of lead contamination place.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that diagram provided in following embodiment is only to show
Meaning mode illustrates basic conception of the invention, and in the absence of conflict, the feature in following embodiment and embodiment can phase
Mutually combination.
Using the soil in the lead contamination place of the area great Zu, Chongqing City lead storage battery factory genuine location as experimental subjects, soil is carried out
The processing of earth reparation and lead recovery process, flow chart is as shown in Figure 1:
Embodiment 1
(1) aqueous solution is formulated as follows using recirculated water: the NH of 0.2mol/L4OH aqueous solution, the H of 0.15mol/L2SiF6It says
Solution, the HNO of 0.1mol/L3Aqueous solution；
(2) the soil 10kg in the lead contamination place after excavating feeds circular shale shaker and is sieved, and 0.61kg is obtained after screening
It is greater than 100mm grade soil I on sieve, measuring lead content therein is 298.1mg/Kg, and lead content is lower therefore can be directly entered
Soil coarse grained working area；And sieve then to enter in rotary screen less than or equal to the soil of 100mm grade down and carry out wet screening, during wet screening
Soil is constantly rinsed with recirculated water, guarantees that the volume of the recirculated water in rotary screen is greater than 27L (the solid volume ratio of liquid i.e. in rotary screen
Greater than 3:1, L:Kg)；
(3) it is small for the soil II and undersize grade of 100~13mm to be divided into oversize particle grade for the soil after rotary screen sieves
In the soil III for being equal to 13mm, wherein soil II is back to rotary screen after entering hammer crushing crusher machine, until being completely formed grain
Grade is less than or equal to the soil of 13mm, and soil of the grade less than or equal to 13mm then enters carbonization pond；
(4) continue the NH that 0.2mol/L is added into carbonization pond4The aqueous solution of OH carries out carbonization 1h to soil, keeps carbonization
The ratio of liquid and solid in pond is not less than 10:1, L:Kg, and the mud after carbonization enters sedimentation centrifuge and separated, obtained
To filter cake I and filtrate I, filter cake I goes successively to decomposing pool and is further processed, and filtrate I can enter carbonization pond and be followed
Ring utilizes；
(5) continue the H that 0.15mol/L is added into decomposing pool2SiF6Aqueous solution to soil carry out resolution process 1h, protect
The ratio of the liquid and solid in decomposing pool is held not less than 10:1, L:Kg, the mud after decomposition enters sedimentation centrifuge progress
Separation, obtains filter cake II and filtrate II, filter cake II goes successively to acidic activated pond and is further processed, and filtrate II then enters
Sewage disposal device is handled；
(6) continue the HNO that 0.1mol/L is added in oxytropism activating tank3Aqueous solution acidic activated processing is carried out to soil
1h keeps the ratio of the liquid and solid in acidic activated pond not less than 10:1, L:Kg, it is acidic activated after mud enter it is heavy
Drop centrifuge is separated, and obtains filter cake III and filtrate III, filter cake III goes successively to service sink and is further processed, and filtrate
III is handled into sewage disposal device；
(7) continue the addition recirculated water into service sink and 0.5h is started the cleaning processing to soil, keep the liquid in service sink
It is not less than 10:1, L:Kg with the ratio of solid, the mud after cleaning enters diaphragm filter press and carries out separating treatment, obtains filter cake
IV and filtrate IV, filter cake IV is treated soil, can enter cleaning soil working area, and filtrate IV then enters sewage
Processing equipment is handled；
(8) Ph regulator (NaOH) and flocculant (PAM) are sequentially added into sewage disposal device, adjust pH value therein
It is 8；After treatment obtains overflow and bottom liquid, and wherein overflow can be directly entered in circulating water pool and be recycled, and bottom
Liquid then enters chamber filter press and is separated by solid-liquid separation, and obtains filter cake V and filtrate V, and filter cake V is leaded pollutant
Into lead cake working area, and filtrate V can return and carry out reprocessing in sewage disposal device until reaching discharge or use
Standard；
(9) grade of soil of the test after above-mentioned process and corresponding lead content, result such as 1 institute of table
Show.
Embodiment 2
(1) aqueous solution is formulated as follows using recirculated water: the NH of 0.2mol/L4OH aqueous solution, the H of 0.15mol/L2SiF6It says
Solution, the HNO of 0.1mol/L3Aqueous solution；
(2) the soil 10kg in the lead contamination place after excavating feeds circular shale shaker and is sieved, and 0.61kg is obtained after screening
It is greater than 100mm grade soil I on sieve, measuring lead content therein is 298.1mg/Kg, and lead content is lower therefore can be directly entered
Soil coarse grained working area；And sieve then to enter in rotary screen less than or equal to the soil of 100mm grade down and carry out wet screening, during wet screening
Soil is constantly rinsed with recirculated water, guarantees that the volume of the recirculated water in rotary screen is greater than 27L (the solid volume ratio of liquid i.e. in rotary screen
Greater than 3:1, L:Kg)；
(3) it is small for the soil II and undersize grade of 100~13mm to be divided into oversize particle grade for the soil after rotary screen sieves
In the soil III for being equal to 13mm, wherein soil II is back to rotary screen after entering hammer crushing crusher machine, until being completely formed grain
Grade is less than or equal to the soil of 13mm, and soil of the grade less than or equal to 13mm then enters carbonization pond；
(4) continue the NH that 0.2mol/L is added into carbonization pond4The aqueous solution of OH carries out carbonization 1.5h to soil, keeps carbon
The ratio for changing liquid and solid in pond is not less than 10:1, L:Kg, and the mud after carbonization enters sedimentation centrifuge and separated,
Filter cake I and filtrate I are obtained, filter cake I goes successively to decomposing pool and is further processed, and filtrate I can enter carbonization pond and carry out
It recycles；
(5) continue the H that 0.15mol/L is added into decomposing pool2SiF6Aqueous solution to soil carry out resolution process 1.5h,
Keep decomposing pool in liquid and solid ratio be not less than 10:1, L:Kg, the mud after decomposition enter sedimentation centrifuge into
Row separation, obtain filter cake II and filtrate II, filter cake II goes successively to acidic activated pond and is further processed, and filtrate II then into
Enter sewage disposal device to be handled；
(6) continue the HNO that 0.1mol/L is added in oxytropism activating tank3Aqueous solution acidic activated processing is carried out to soil
1.5h keeps the ratio of the liquid and solid in acidic activated pond not less than 10:1, L:Kg, it is acidic activated after mud enter
Sedimentation centrifuge is separated, and obtains filter cake III and filtrate III, filter cake III goes successively to service sink and is further processed, and filters
Liquid III then enters sewage disposal device and is handled；
(7) continue the addition recirculated water into service sink and 0.75h is started the cleaning processing to soil, keep the liquid in service sink
It is not less than 10:1, L:Kg with the ratio of solid, the mud after cleaning enters diaphragm filter press and carries out separating treatment, obtains filter cake
IV and filtrate IV, filter cake IV is treated soil, can enter cleaning soil working area, and filtrate IV then enters sewage
Processing equipment is handled；
(8) Ph regulator (NaOH) and flocculant (PAM) are sequentially added into sewage disposal device, adjust pH value therein
It is 9；After treatment obtains overflow and bottom liquid, and wherein overflow can be directly entered in circulating water pool and be recycled, and bottom
Liquid then enters chamber filter press and is separated by solid-liquid separation, and obtains filter cake V and filtrate V, and filter cake V is leaded pollutant
Into lead cake working area, and filtrate V can return and carry out reprocessing in sewage disposal device until reaching discharge or use
Standard；
(9) grade of soil of the test after above-mentioned process and corresponding lead content, result such as 1 institute of table
Show.
Embodiment 3
(1) aqueous solution is formulated as follows using recirculated water: the NH of 0.2mol/L4OH aqueous solution, the H of 0.15mol/L2SiF6It says
Solution, the HNO of 0.1mol/L3Aqueous solution；
(2) the soil 10kg in the lead contamination place after excavating feeds circular shale shaker and is sieved, and 0.61kg is obtained after screening
It is greater than 100mm grade soil I on sieve, measuring lead content therein is 298.1mg/Kg, and lead content is lower therefore can be directly entered
Soil coarse grained working area；And sieve then to enter in rotary screen less than or equal to the soil of 100mm grade down and carry out wet screening, during wet screening
Soil is constantly rinsed with recirculated water, guarantees that the volume of the recirculated water in rotary screen is greater than 27L (the solid volume ratio of liquid i.e. in rotary screen
Greater than 3:1, L:Kg)；
(3) it is small for the soil II and undersize grade of 100~13mm to be divided into oversize particle grade for the soil after rotary screen sieves
In the soil III for being equal to 13mm, wherein soil II is back to rotary screen after entering hammer crushing crusher machine, until being completely formed grain
Grade is less than or equal to the soil of 13mm, and soil of the grade less than or equal to 13mm then enters carbonization pond；
(4) continue the NH that 0.2mol/L is added into carbonization pond4The aqueous solution of OH carries out carbonization 2h to soil, keeps carbonization
The ratio of liquid and solid in pond is not less than 10:1, L:Kg, and the mud after carbonization enters sedimentation centrifuge and separated, obtained
To filter cake I and filtrate I, filter cake I goes successively to decomposing pool and is further processed, and filtrate I can enter carbonization pond and be followed
Ring utilizes；
(5) continue the H that 0.15mol/L is added into decomposing pool2SiF6Aqueous solution to soil carry out resolution process 2h, protect
The ratio of the liquid and solid in decomposing pool is held not less than 10:1, L:Kg, the mud after decomposition enters sedimentation centrifuge progress
Separation, obtains filter cake II and filtrate II, filter cake II goes successively to acidic activated pond and is further processed, and filtrate II then enters
Sewage disposal device is handled；
(6) continue the HNO that 0.1mol/L is added in oxytropism activating tank3Aqueous solution acidic activated processing is carried out to soil
2h keeps the ratio of the liquid and solid in acidic activated pond not less than 10:1, L:Kg, it is acidic activated after mud enter it is heavy
Drop centrifuge is separated, and obtains filter cake III and filtrate III, filter cake III goes successively to service sink and is further processed, and filtrate
III is handled into sewage disposal device；
(7) continue recirculated water is added into service sink and 1h started the cleaning processing to soil, keep liquid in service sink and
The ratio of solid is not less than 10:1, L:Kg, and the mud after cleaning enters diaphragm filter press and carries out separating treatment, obtains filter cake IV
With filtrate IV, filter cake IV is treated soil, can enter cleaning soil working area, and filtrate IV then enters at sewage
Reason equipment is handled；
(8) Ph regulator (NaOH) and flocculant (PAM) are sequentially added into sewage disposal device, adjust pH value therein
It is 10；After treatment obtains overflow and bottom liquid, and wherein overflow can be directly entered in circulating water pool and be recycled, and bottom
Liquid then enters chamber filter press and is separated by solid-liquid separation, and obtains filter cake V and filtrate V, and filter cake V is leaded pollutant
Into lead cake working area, and filtrate V can return and carry out reprocessing in sewage disposal device until reaching discharge or use
Standard；
(9) grade of soil of the test after above-mentioned process and corresponding lead content, result such as 1 institute of table
Show.
The grade and Pb content of soil after being handled in 1 Examples 1 to 3 of table
Control experiment:
Reparation operation is carried out using soil of the elution technique in the prior art to identical place, tests scrubbed technology
The grade of treated soil and corresponding lead content, the results are shown in Table 2.
Pb content in the soil after Pb content and scrubbed technical treatment in the former lead contamination of table 2 place in soil
| Granularmetric composition/mm | Each grain size content/% | Lead content/mg/kg in original soil | Lead content/mg/kg in soil after elution is repaired |
| +100 | 6.1 | 357.3 | 251.7 |
| 100-13 | 5.5 | 834.6 | 292.11 |
| 13-5 | 4.3 | 2800.7 | 392.098 |
| 5-2 | 3.8 | 4276.7 | 855.34 |
| 2-1 | 8.4 | 6035.4 | 1508.85 |
| 1-0.25 | 10.1 | 10060.1 | 3018.03 |
| < 0.25 | 61.8 | 18592.9 | 20795.7 |
| It is total | 100 | 13364.1 | 13364.1 |
Note: construction land one kind land used land pollutant risk screening value is 400mg/kg.
The soil in the lead contamination place is through eluting skill it can be seen from the measurement result of lead content in the above Tables 1 and 2
Only 15.9% soil meets the needs of direct in-situ backfill after art reparation, and land pollutant is rich in being less than 0.25mm grade soil
Collection.And after technical solution of the present invention is repaired, in the soil in the place, the content of lead is significantly reduced, and lead contains in each grade soil
It is 400mg/kg standard that amount, which is respectively less than construction land one kind land used land pollutant risk screening value, and what all satisfaction backfilled in situ wants
It asks；In addition, the content for testing lead in the lead cake in obtained lead cake working area realizes lead resource in soil 80% or so
It recycles, avoids the secondary pollution to environment.
In conclusion the soil remediation and lead recovery process in a kind of lead contamination place disclosed by the invention, by lead contamination
After the grade screening of the soil in place, the carbonization treatment of soil, resolution process and acidic activated processing, cleaning and filtrate processing
The processing operation for carrying out lead resource recycling, finally obtains cleaning soil and leaded filter cake, the soil for realizing lead contamination place is complete
Portion backfills the purpose with the recycling of lead resource in soil in situ, avoids the secondary pollution to surrounding enviroment, is lead contamination
The depth repairing and treating that place obtains soil provides technical guarantee.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (9)
1. the soil remediation and lead recovery process in a kind of lead contamination place, which is characterized in that the technique includes:
(1) the soil separate screening and break process in lead contamination place, obtains the soil greater than 100mm grade and is less than or equal to
The soil of 13mm grade；
(2) soil for being less than or equal to 13mm grade described in step (1) is subjected to carbonization treatment, obtains filter cake by sedimentation centrifugation
Ⅰ；
(3) resolution process is carried out to the filter cake I in step (2), obtains filter cake II and filtrate II by sedimentation centrifugation:
(4) acidification is carried out to the filter cake II in step (3), obtains filter cake III and filtrate III by sedimentation centrifugation:
(5) cleaning separating treatment is carried out to the filter cake III in step (4), obtains filter cake IV and filtrate IV, the filter cake IV is
Cleaning soil:
(6) filtrate obtained in step (3)~(5) is subjected to sewage treatment, after treatment is separated by solid-liquid separation to obtain filter cake
V and filtrate V, the filter cake V is lead salvage material.
2. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that step
(1) soil separate of lead contamination place described in is sieved and break process specifically:
(1) soil in the lead contamination place circular shale shaker is fed to sieve, on sieve greater than 100mm grade soil I into
Enter soil coarse grained working area, enter in rotary screen under sieve less than or equal to 100mm grade soil and carry out wet screening, obtains on rotary screen sieve
The lower soil III less than or equal to 13mm grade of soil II and rotary screen sieve of 100~13mm grade, with following during the wet screening
Ring water rinses soil；
(2) so that soil II is entered hammer mill, rotary screen is back to after broken and carries out wet screening, is repeated until the soil
II all as the lower soil IV less than or equal to 13mm of rotary screen sieve.
3. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that step
(2) carbonization treatment described in specifically: the soil for being less than or equal to 13mm grade described in step (1) is entered in carbonization pond, is held
The continuous NH that 0.2mol/L is added4The aqueous solution of OH carries out 1~2h of carbonization, carries out sedimentation centrifugation after carbonization, respectively obtains filter
Cake I and filtrate I.
4. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that step
(3) resolution process described in specifically: filter cake I described in step (2) enters in decomposing pool, is continuously added into 0.15mol/L's
H2SiF6Aqueous solution carry out 1~2h of decomposition, carry out sedimentation centrifugation after decomposition, respectively obtain filter cake II and filtrate II.
5. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that step
(4) acidification described in specifically: filter cake II described in step (3) enters in acidic activated pond, is continuously added into 0.1mol/L
HNO3Aqueous solution carry out 1~2h of acidification, carry out sedimentation centrifugation after acidification, respectively obtain filter cake III and filtrate
Ⅲ。
6. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that step
(5) separating treatment is cleaned described in specifically: filter cake III described in step (4) enters in service sink to be cleaned with recirculated water
0.5~1h enters diaphragm filter press and carries out separating treatment, obtains filter cake IV and filtrate IV after cleaning, the filter cake IV into
Enter cleaning soil working area.
7. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that the carbon
Change the volume mass of the liquid and solid ratio in pond that is carbonized in treatment process and is not less than 10:1, decomposing pool during the resolution process
The volume mass of middle liquid and solid ratio is not less than 10:1, liquid and solid in acidic activated pond during the acidification
Volume mass ratio is not less than 10:1, and the volume mass of liquid and solid ratio is not small in the cleaning separating treatment Cleaning Process pond
In 10:1, the unit of the volume mass ratio is mL:g.
8. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 1, which is characterized in that step
(6) sewage treatment described in specifically: filtrate II obtained in step (3)~(5), filtrate III and filtrate IV enter sewage treatment
Equipment is handled, and overflow and bottom liquid are obtained, and the overflow enters circulating water pool and recycled, and the bottom liquid enters filters pressing
Machine is separated by solid-liquid separation, and filter cake V and filtrate V are obtained, and the filter cake V enters lead cake working area, and the filtrate V enters sewage
Processing equipment repeats aforesaid operations.
9. the soil remediation and lead recovery process in a kind of lead contamination place according to claim 8, which is characterized in that step
(6) addition NaOH is pH adjustment in sewage disposal device described in and the pH value adjusted in the sewage disposal device is 8~10,
Addition PAM is flocculant.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103750A (en) * | 1986-05-28 | 1988-03-02 | 戴元宁 | Wet process for extracting metallic compound from multi-metal refractory paragenetic ore |
| US6085911A (en) * | 1997-08-07 | 2000-07-11 | Greenleigh; Stephen H. | Method and apparatus for extracting metallic contaminants from substrates |
| CN1705525A (en) * | 2002-10-24 | 2005-12-07 | 帝人纤维株式会社 | Method for clarifying soil |
| CN101362146A (en) * | 2008-09-12 | 2009-02-11 | 中山大学 | Chemical leaching repairing method for removing heavy metal and arsenic from soil |
| CN103137231A (en) * | 2011-11-30 | 2013-06-05 | 荏原工业洗净株式会社 | Decontamination method and apparatus for solid-state material contaminated by radiocesium |
| CN103909089A (en) * | 2014-04-14 | 2014-07-09 | 北京矿冶研究总院 | Method for leaching heavy metal contaminated soil |
| JP2015123393A (en) * | 2013-12-26 | 2015-07-06 | 株式会社ネオス | Method and system for extracting and removing heavy metals in soil |
| CN105268737A (en) * | 2015-11-15 | 2016-01-27 | 长沙新气象自动化技术有限公司 | Heavy metal contaminated soil remediation equipment and remediation process thereof |
| CN106077060A (en) * | 2016-02-28 | 2016-11-09 | 湖南先科环保有限公司 | A kind of heavy-metal contaminated soil processing means and process technique thereof |
| CN106167852A (en) * | 2016-06-30 | 2016-11-30 | 天津市兰依科技股份有限公司 | A kind of potash fertilizer produce in the solid-liquid processing system of mine tailing and method |
| CN107597827A (en) * | 2017-09-29 | 2018-01-19 | 广西博世科环保科技股份有限公司 | It is a kind of to remove the method for arsenic antimony and other heavy metal elements in contaminated site soil |
| CN108778539A (en) * | 2016-02-10 | 2018-11-09 | 法国原子能源和替代能源委员会 | The method for carrying out selective dissolution using nonionic surfactant |
-
2019
- 2019-07-31 CN CN201910702954.XA patent/CN110479746B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103750A (en) * | 1986-05-28 | 1988-03-02 | 戴元宁 | Wet process for extracting metallic compound from multi-metal refractory paragenetic ore |
| US6085911A (en) * | 1997-08-07 | 2000-07-11 | Greenleigh; Stephen H. | Method and apparatus for extracting metallic contaminants from substrates |
| CN1705525A (en) * | 2002-10-24 | 2005-12-07 | 帝人纤维株式会社 | Method for clarifying soil |
| CN101362146A (en) * | 2008-09-12 | 2009-02-11 | 中山大学 | Chemical leaching repairing method for removing heavy metal and arsenic from soil |
| CN103137231A (en) * | 2011-11-30 | 2013-06-05 | 荏原工业洗净株式会社 | Decontamination method and apparatus for solid-state material contaminated by radiocesium |
| JP2015123393A (en) * | 2013-12-26 | 2015-07-06 | 株式会社ネオス | Method and system for extracting and removing heavy metals in soil |
| CN103909089A (en) * | 2014-04-14 | 2014-07-09 | 北京矿冶研究总院 | Method for leaching heavy metal contaminated soil |
| CN105268737A (en) * | 2015-11-15 | 2016-01-27 | 长沙新气象自动化技术有限公司 | Heavy metal contaminated soil remediation equipment and remediation process thereof |
| CN108778539A (en) * | 2016-02-10 | 2018-11-09 | 法国原子能源和替代能源委员会 | The method for carrying out selective dissolution using nonionic surfactant |
| CN106077060A (en) * | 2016-02-28 | 2016-11-09 | 湖南先科环保有限公司 | A kind of heavy-metal contaminated soil processing means and process technique thereof |
| CN106167852A (en) * | 2016-06-30 | 2016-11-30 | 天津市兰依科技股份有限公司 | A kind of potash fertilizer produce in the solid-liquid processing system of mine tailing and method |
| CN107597827A (en) * | 2017-09-29 | 2018-01-19 | 广西博世科环保科技股份有限公司 | It is a kind of to remove the method for arsenic antimony and other heavy metal elements in contaminated site soil |
Non-Patent Citations (1)
| Title |
|---|
| NEALE, CN 等: "Evaluating acids and chelating agents for removing heavy metals from contaminated soils", 《ENVIRONMENTAL PROGRESS》 * |
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