CN105032921B - A kind of method, system and the control method of efficiently press filtration elution contaminated soil - Google Patents
A kind of method, system and the control method of efficiently press filtration elution contaminated soil Download PDFInfo
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Abstract
The invention discloses a kind of method, system and the control method of efficiently press filtration elution contaminated soil.The method of the restoration of soil polluted by heavy metal comprises the following steps：S1, slurrying, acidification reaction；S2, by it is above-mentioned fully reacted slurries filtration obtain soil filter cake and filtrate；S3, pre- elution, make it come out the heavy metal displacement washing remained in pore in filter cake；After S4, pre- elution, eluent substep is injected in the washing reaction type diaphragm filter press and carries out multistage elution reaction；After S5, elution have been reacted, stabilized to remaining in the heavy metal to dissociate in soil filter cake, the small heavy metal particles for simultaneously being formed stabilization procedures are migrated out in soil, and input pressure is 0.22 0.35 MPa, and vulcanization leaching quantity is 50 80% containing water inventory in soil；S6, stabilize soil.The present invention, which solves the problems, such as in prior art lessivation that leacheate is residued in soil, causes soil Leaching heavy metal index exceeding standard.
Description
Technical field
The present invention relates to a kind of method and system and control method of efficiently press filtration elution contaminated soil, belong to environment remediation
Field.
Background technology
With China's rapid development of economy so that resource-type mineral products are drastically exploited, the enterprise such as mining, metallurgical and chemical industry
Start one after another, because environmental practice is relatively backward and it is not in place to supervise, cause industrial sites and Soil Surrounding and underground water pollution
Getting worse, and triggered a series of Environment Pollution Events；It is simultaneously dirty to environment with the quickening and people of urbanization process
Dye problem is more and more sensitive, therefore the reparation of heavy-metal contaminated soil and recycling turn into one of current most urgent environmental problem.
Due to features such as heavy metal pollution chronicity, disguise and irreversibilities, can directly or indirectly polluted surface water, underground water,
Air, plant and crops, or even the health and lives of the mankind are endangered, therefore, restoration of soil polluted by heavy metal, it is former to recover soil
It is functional, it is always difficult point both domestic and external and focus environmental problem.
Currently used soil restoring technology mainly has curing/stabilizing, elution is repaired and phytoremediation.And Soil leaching
Reparation is that an application is strong, the controllable and fireballing soil remediation Treatment process that can thoroughly remove pollutant, processing procedure, often
For the repairing and treating of contaminated site, it is widely used abroad in contaminated site reparation, and achieve good
Repairing effect.But it is relatively low, most eluent efficiency to be present in Soil leaching reparation（Acid eluent）Soil texture, elution can be destroyed
Output of fluid is big and eluent recovery is difficult, cost is high and may cause the drawbacks such as serious secondary pollution；Soil leaching is repaiied simultaneously
The selection of eluent is the key of recovery technique in recovering technology, and the quality of eluent determines the final reparation effect of soil remediation
Fruit, therefore Soil leaching repairs the research of more eluent repairing effects partially.
As the A of Chinese patent CN 104289515 propose a kind of ELUTION METHOD of heavy-metal contaminated soil, by organic acid with
Additive compound promotes the desorption solubilising of heavy metal in soil into leacheate, has widened the scope of application of leacheate and has improved elution
Agent efficiency, while the waste liquid after elution removes wherein heavy metal by adsorbent, residual waste solution recycles as leacheate, section
About medicament and water resource.The technology is only studied in laboratory stage eluent heavy metal clearance, without to elution
Slag afterwards carries out Leaching research；The present invention relates to Soil leaching to repair not only heavy metal total amount（That is clearance）There is index
It is required that also there is index request to the Leaching of the soil after reparation simultaneously.
And for example eluted after the soil screening that will get dirty of the A of patent CN 104307861 propositions with eluent, by heavy metal
Migrated into from solid phase of soil in elution liquid phase, by the purpose for reaching reparation after separation of solid and liquid.The technology belongs to traditional soil
Earth elutes recovery technique, and same heavy metal clearance is studied, and the Leaching of the soil after elution is not carried out
Following drawback be present in analysis, the technology：1st, elution is remained in by eluent after separation of solid and liquid will cause secondary pollution in soil
The problem of problem；2nd, heavy metal is transferred in leacheate by leacheate from solid phase, in last part eluent residual soil, is led
Soil Leaching heavy metal index does not reach risk assessment Leaching index request after causing elution.
Chinese invention patent CN201510430149.8 proposes a kind of side of press filtration elution restoration of soil polluted by heavy metal
Method, the present invention are the further research carried out to it.
The content of the invention
The defects of for present in existing Soil leaching recovery technique, the present invention is intended to provide a kind of efficiently press filtration elution is dirty
The method and system of soil are contaminated, the restorative procedure and system can efficiently solve leacheate in prior art lessivation and remain
The problem of causing soil Leaching heavy metal index exceeding standard in soil and the eluent secondary pollution soil remained in soil
The problem of earth, further, the present invention can solve after having eluted again with stabilization agent by remain soil middle reaches from heavy metal
When being converted into solid phase, produce finely ground particles and enter the problem of liquid phase causes heavy metal index exceeding standard when Leaching detects,
Yet further, the present invention can also reduce elution medicament from Sources controlling leaching quantity and waste, and elution medicament cost recovery is asked
Topic.
To achieve these goals, the technical solution adopted in the present invention is：
A kind of method of efficiently press filtration elution contaminated soil, is characterized in, comprises the following steps：
S1, heavy-metal contaminated soil is carried out to crushing and screening, and water will be added to carry out slurrying in the soil after crushing and screening, then
Acid adding with soil can acid soluble heavy metal fully reacted；
S2, by it is above-mentioned fully reacted slurry carry out being filtrated to get soil filter cake and filtrate in diaphragm filter press；
S3, clear water is inputted in the diaphragm filter press with pump eluted in advance, it is remained in pore in filter cake
Heavy metal displacement washing come out；
After S4, pre- elution, the barrier film press filtration is injected by different eluent substeps is prepared according to different pollution factors
Multistage elution reaction is carried out in machine, eluent is fully reacted with the heavy metal in soil, different eluent total amounts are leaching
Wash the theoretical response value of heavy metal in soil total amount 0.5-1.5 times, input pressure are 0.2-0.3 MPa；
After S5, elution have been reacted, vulcanizing agent is squeezed into the diaphragm filter press, to remaining in what is dissociated in soil filter cake
Heavy metal is stabilized, while the small heavy metal particles for forming stabilization procedures are migrated out in soil, and input pressure is
0.22-0.35 MPa（Relative to the high 0.02-0.05MPa of elution reaction input pressure）, vulcanization leaching quantity is in soil filter cake
50-80% containing water inventory；
S6, most afterwards through stabilized soil in clear water or alkali lye rinsing step S5, make to residue in transportable in soil filter cake
The heavy metal ion or heavy metal compound or heavy metal complex gone out further fully washes out with clear water stream, until eluate pH
Untill being detected as 6-9, the soil after being repaired.
Alkali lye described in step S6 of the present invention refers to alkaline earth oxide or the solution of hydroxides configuration, such as lime
Water etc..
Thus, can be preferably relative to elution reaction input pressure high 0.02-0.05 MPa in step S5 of the present invention
The molecule formed in elution and sulfidation is carried out from filter cake, while does not destroy filter cake again and causes secondary dirt
The problem of dye.
According to an embodiment of the invention, further optimization can also be made to the present invention, below the skill to be formed after optimization
Art scheme：
In step S1, the solid-to-liquid ratio 1 of soil and water during slurrying:3-1：5.
In step S2, filter pressure 0.2-0.5MPa, filter cake thickness 2.5-3.5cm, filter cake moisture content 70-80%.
In step S3, the input pressure of clear water is 0.2-0.3 MPa during elution in advance, and leaching quantity is aqueous in soil filter cake
The 50-100% of total amount.
Crushing and screening in step S1 is by heavy-metal contaminated soil crush in feeding disintegrating machine, subsequently into screening
System, soil particle particle diameter is set to be not more than 3mm, it is possible thereby to which the impurity in soil and bulky grain stone are separated.
, will weight using ring waste recycling medicament by ring waste caused by multistage elution course of reaction in step S4
Metal is precipitated or flocculated, and separation of solid and liquid is carried out after being disposed, and filtrate, which can return to, carries out slurrying in step S1, filter residue enters
The follow-up resource reclaim of row carries out dangerous waste landfill.Further, the ring waste recycling medicament is sulphurizing salt（Such as sulphur
Change sodium, potassium sulfide, ammonium sulfide etc.）, metal chloride（Such as iron chloride, PAC）, one or more in highly basic and weak base.
In step S6, input pressure 0.2-0.3MPa, leaching quantity is the 50%-80% containing water inventory in soil.
In multistage elution reaction of the invention, pre-leaching is washed, and different elution medicaments are prepared not according to different pollution factors
Multistage is carried out in same eluent substep injection diaphragm filter press and elutes reaction, allows it to be carried out with the heavy metal in soil fully anti-
Should, the different eluent total amounts are 0.5-1.5 times of the theoretical response value of total metalses in washed off soil, and input pressure is
0.2-0.3 MPa, it is basically identical with eluting in advance.
Preferably, the acid in step S1 refers at least one of sulfuric acid, hydrochloric acid and citric acid；It is highly preferred that step S1
In acid be hydrochloric acid, concentration is 0.1-1.0mol/L.
Eluent in step S4 refers to EDTA, Na2-EDTA、Na2S2O3At least one of with CaO.Further preferably
The eluent is EDTA；Or successively select one kind of above-mentioned eluent according to the heterogeneity of a variety of pollution factors in soil
It is or a variety of.
Preferably, the vulcanizing agent in step S5 is dissolvable sulfide.It is highly preferred that the dissolvable sulfide is vulcanization
At least one of sodium, thiocarbamide and vulcanization ammonia.
Based on same inventive concept, present invention also offers a kind of side of efficiently press filtration elution contaminated soil described above
Restoration of soil polluted by heavy metal processing system used in method, including
- slurrying reactor, in the soil after crushing and screening water will be added to carry out slurrying；
- diaphragm filter press, it has plup inlet and multiple fluid holes；
- soda liquor container；
- elution liquid container；
- vulcanization agent container；
- leacheate collection vessel；And
- filtration recycle vessel；
The port of export of the slurrying reactor is connected by pipeline with the entrance point of pan feeding pump, the port of export of the pan feeding pump with
The plup inlet connection of the diaphragm filter press；
The soda liquor container, elution liquid container and vulcanization agent container are connected by the entrance point of pipeline and washing pump respectively
Logical, the port of export of washing pump is connected by pipeline with the part in the fluid hole of the diaphragm filter press, the diaphragm filter press
Fluid hole in a part connected by pipeline with leacheate collection vessel, filtration recycle vessel；
The slurrying reactor, leacheate collection vessel, filtration recycle vessel, soda liquor container, elution liquid container, vulcanization
Agent container, pan feeding pump, washing pump and diaphragm filter press connecting pipe on be equipped with corresponding control valve.
The soda liquor container contains the clear water or alkali lye described in step S6.
Based on same inventive concept, present invention also offers a kind of restoration of soil polluted by heavy metal processing system as described above
The control method of system, is characterized in, comprises the following steps：
1）When heavy metal contaminated soil carries out slurrying reaction, the valve on closing slurrying reactor discharge end pipeline；
2）When slurrying filters after completion of the reaction, the valve on pan feeding pump discharge end and entrance point pipeline, barrier film press filtration are opened
Corresponding valve is all turned on each fluid hole of machine, while the valve opening on the feed end pipeline of filtration recycle vessel, is entered
Row filtering；
3）During pre- elution, by corresponding valve Close All on each fluid hole of diaphragm filter press, pan feeding pump discharge is closed
Valve on end and entrance point pipeline, while the valve on the feed end pipeline of filtration recycle vessel is closed, open cleaning fluid
The valve on valve and washing pump pipeline on container outlet end pipe road, it is then turned on leacheate collection vessel feed end pipeline
Valve, eluted in advance；
4）When carrying out multistage elution reaction：The valve on the feed end pipeline of elution liquid container is opened, cleaning fluid is closed and holds
Valve on device port of export pipeline, carry out multistage elution reaction；
5）During vulcanization reaction, the valve on vulcanizing agent container discharge end pipe road is opened, closes leacheate container discharge end pipe
Valve on road, carry out vulcanization reaction；
6）During harmless treatment, the valve on soda liquor container port of export pipeline is opened, closes vulcanizing agent container discharge end
Valve on pipeline, harmless treatment is carried out, each valve is in closed mode after hours.
The soda liquor container contains the clear water or alkali lye described in step S6.
Compared with prior art, the beneficial effects of the invention are as follows：
（1）Leacheate total amount can be reduced, this technology is focused on soluble heavy metal dissolution, first time by secondary response
Reaction efficiency, second of emphasis elution effect, so on the premise of eluent total amount is ensured, reduces the liquid-solid ratio of slurrying, carries
High eluent reaction density, while flowed by high pressure and replace elution, leacheate dosage is greatly lowered, typically using such skill
Art liquid-solid ratio is 10:1—8:1, this technology can be down to 5：1—3:1, final realize reduces leacheate total amount about 50%；
（2）It is applied widely, avoid multiple slurrying and separation of solid and liquid, treatment effeciency height.This technology washing reaction type every
Filtering, elution and reaction are integrated in filter press membrane, realize one-machine-multi-function, each operation realizes integration operation in filter press,
Using different response parameters when the different pollution factors in soil that avoid getting dirty are repaired, multiple separation of solid and liquid, slurrying reaction etc. are needed
Step, and be fixed in this technique due to getting dirty soil in filter process in filter chamber, only need to be to different elution medicaments
Differential responses parameter is set, inputs in filter chamber and the multiple slurrying reaction of tradition elution technique, whole work(of separation of solid and liquid can be achieved
Can, utilization rate of equipment and installations is improved, saves construction investment；This technology elutes work in the similar soil in-situ that is reduced into of lessivation simultaneously
Skill, but compared with more more controllable than original position elution technique.
（3）Avoid soil secondary pollution after repairing.This technology will thoroughly elute medicament from soil by harmless treatment
Elute or Non-toxic processing, make after reparation that raffinate pH concentration reaches 6-9 in soil, it is final realize avoid repairing after soil
The problem of secondary pollution.
（4）Heavy metal index reaches when soil toxicity leaches detection after reparation《Surface water quality》Three class water standards.This
Invention is flowed by clear-water high-pressure and replaces elution, and the heavy metal to dissociate in soil is sufficiently displaced from being washed out, then uses sulphur again
Agent will remain in the heavy metal to dissociate in soil filter cake and further carry out stabilisation and form small heavy metal particles, then pass through
High-velocity flow carries out out the particle formed immediately in soil in time, finally realizes the harmless treatment of soil, solves existing
Have and leacheate remained in elution technique soil and the problem of heavy metal, and by after elution again being fixed, at stabilisation
Heavy metal backfill in part can again discharge and cause soil toxicity to leach the environmental risk of heavy metal index exceeding standard after reason, solve simultaneously
Determined after elution carry out immobilization, stabilize after soil toxicity leach heavy metal index exceeding standard the problem of.
Below in conjunction with drawings and examples, the present invention is further elaborated.
Brief description of the drawings
Fig. 1 is the flow chart of an embodiment of the present invention；
Fig. 2 is system diagram of the present invention.
Embodiment
Embodiment 1：
A kind of method that heavy-metal contaminated soil press filtration elution is repaired, comprises the following steps：
（1）Slurrying is reacted：On the basis of certain Pb pollutes discarded place soil, total Pb levels 3.075mg/g will be broken
Soil 350kg after screening, by liquid-solid ratio 5:1 1.0 mol/L citric acids of addition are stirred slurrying reaction 30min, by soil
In can acid soluble heavy metal fully reacted；
（2）Filtering：Above-mentioned fully reacted slurry is carried out being filtrated to get soil in washing reaction type diaphragm filter press
Earth filter cake and filtrate, the filter pressure are 0.5MPa, filter cake thickness 3.5cm, moisture content 70%；
（3）Pre- elution：Clear water is inputted in washing reaction type diaphragm filter press with pump and eluted, makes it by hair in filter cake
The heavy metal displacement washing remained in pore comes out；The input pressure is 0.3 MPa, and leaching quantity is to contain water inventory in soil
50%；
（4）Multistage elution reaction：Pre-leaching washes, by alkali lye（Quick lime）Eluent injects washing reaction type diaphragm filter press
In carry out elution reaction, allow it fully to be reacted with the heavy metal in soil, the quick lime total amount be washed off soil in weight
1.5 times of the theoretical response value of total metal content, input pressure is 0.3 MPa, basically identical with eluting in advance；
（5）Vulcanization reaction：After elution has been reacted, thiocarbamide is injected in washing reaction type diaphragm filter press, allows and remains in soil
The heavy metal to dissociate in earth filter cake is stabilized, while the small heavy metal particles that stabilization procedures are formed migrate out soil
In, input pressure is 0.35 MPa, and vulcanization leaching quantity is 50% containing water inventory in soil；
（6）Harmless treatment：After vulcanization reaction terminates, being cleaned again with clear water and limewash makes to residue in soil filter cake
It is transportable go out heavy metal ion or heavy metal compound or heavy metal complex further fully washed out with washing current, it is described
Input pressure is 0.3 MPa, and leaching quantity is 80% containing water inventory in soil, untill eluate pH is detected as 9, is obtained
Soil after reparation, finally backfilled (repairing effect is shown in Table 1).
Embodiment 2：
A kind of method that heavy-metal contaminated soil press filtration elution is repaired, comprises the following steps：
（1）Slurrying is reacted：On the basis of certain Pb pollutes discarded place soil, total Pb levels 3.075mg/g will be broken
Soil 250kg after screening, by liquid-solid ratio 3:1 0.1 mol/L sulfuric acid of addition is stirred slurrying reaction 30min, by soil
Can acid soluble heavy metal fully reacted；
（2）Filtering：Above-mentioned fully reacted slurry is carried out being filtrated to get soil in washing reaction type diaphragm filter press
Earth filter cake and filtrate, the filter pressure are 0.2 MPa, filter cake thickness 2.5, moisture content 80%；
（3）Pre- elution：Clear water is inputted in washing reaction type diaphragm filter press with pump and eluted, makes it by hair in filter cake
The heavy metal displacement washing remained in pore comes out；The input pressure is 0.2 MPa, and leaching quantity is to contain water inventory in soil
100%；
（4）Multistage elution reaction：Pre-leaching washes, by Na2Eluted in-EDTA injection washing reaction type diaphragm filter press
Reaction, allows it fully to be reacted with the heavy metal in soil, the Na2- EDTA total amounts are total metalses in washed off soil
0.5 times of theoretical response value, input pressure is 0.2 MPa, basically identical with eluting in advance；
（5）Vulcanization reaction：After elution has been reacted, by vulcanization ammonia injection washing reaction type diaphragm filter press, allow and remain in
The heavy metal to dissociate in soil filter cake is stabilized, while the small heavy metal particles that stabilization procedures are formed are migrated and are unearthed
In earth, input pressure is 0.22 MPa, and vulcanization leaching quantity is 80% containing water inventory in soil；
（6）Harmless treatment：After vulcanization reaction terminates, cleaned again with clear water make to residue in soil filter cake it is transportable go out
Heavy metal ion or heavy metal compound or heavy metal complex further fully washed out with washing current, the input pressure
For 0.2 MPa, leaching quantity is 50% containing water inventory in soil, untill eluate pH is detected as 6, after being repaired
Soil, finally backfilled (repairing effect is shown in Table 1).
Embodiment 3：
A kind of method that heavy-metal contaminated soil press filtration elution is repaired, comprises the following steps：
（1）Slurrying is reacted：On the basis of certain Pb, Cr combined pollution discards place soil, total Pb, Cr levels are respectively
3.075mg/g, 2.136mg/g, by the soil 300kg after crushing and screening, by liquid-solid ratio 4:1, which adds 0.7 mol/L hydrochloric acid, is carried out
Stir slurrying reaction 30min, by soil can acid soluble heavy metal fully reacted；
（2）Filtering：Above-mentioned fully reacted slurry is carried out being filtrated to get soil in washing reaction type diaphragm filter press
Earth filter cake and filtrate, the filter pressure are 0.35 MPa, filter cake thickness 3cm, moisture content 76%；
（3）Pre- elution：Clear water is inputted in washing reaction type diaphragm filter press with pump and eluted, makes it by hair in filter cake
The heavy metal displacement washing remained in pore comes out；The input pressure is 0.25 MPa, and leaching quantity is aqueous total in soil
The 78% of amount；
（4）Multistage elution reaction：Pre-leaching is washed, and EDTA is injected in washing reaction type diaphragm filter press and elute instead
Should, allow it to carry out with the heavy metal Pb in soil after fully reaction terminates, then by Na2S2O3Inject washing reaction type barrier film press filtration
Elution reaction is carried out in machine, allows it further fully to be reacted with the heavy metal Cr in soil, described EDTA, Na2S2O3 are total
Amount be heavy metal Pb in washed off soil, 1 times of theoretical response value of Cr total amounts, input pressure is 0.25 MPa, with pre-leaching
Wash basically identical；
（5）Vulcanization reaction：After elution has been reacted, vulcanized sodium is injected in washing reaction type diaphragm filter press, allows and remains in
The heavy metal to dissociate in soil filter cake is stabilized, while the small heavy metal particles that stabilization procedures are formed are migrated and are unearthed
In earth, input pressure is 0.28 MPa, and vulcanization leaching quantity is 63% containing water inventory in soil；
（6）Harmless treatment：After vulcanization reaction terminates, cleaned again with limewash make to residue in it is transportable in soil filter cake
The heavy metal ion or heavy metal compound or heavy metal complex gone out further fully washes out with washing current, the input pressure
Power is 0.25 MPa, and leaching quantity is 67% containing water inventory in soil, untill eluate pH is detected as 7.5, is repaired
Soil afterwards, finally backfilled (repairing effect is shown in Table 1).
Embodiment 4
Processing system used in a kind of method of efficiently press filtration elution contaminated soil described above, as shown in Fig. 2 including using
In the soil after by crushing and screening plus water carries out the slurrying reactor 1 of slurrying, and there is plup inlet 31, leacheate to wash into hole
33rd, the washing reaction type diaphragm filter press 3 of leacheate fluid hole 34 and multiple fluid holes 32, soda liquor container 6, liquid container is eluted
7, vulcanize agent container 8, leacheate collection vessel 4；And filtration recycle vessel 5；The port of export of the slurrying reactor 1 passes through pipe
Road connects with the entrance point of pan feeding pump 2, the plup inlet 31 of the port of export of the pan feeding pump 2 and the washing reaction type diaphragm filter press
Connection；The soda liquor container 6, elution liquid container 7 are connected by the entrance point of pipeline washing pump 9 respectively with vulcanization agent container 8,
The port of export of washing pump 9 is connected by pipeline with the part in the fluid hole 32 of the washing reaction type diaphragm filter press, should
A part in the fluid hole 32 of washing reaction type diaphragm filter press is held by pipeline and leacheate collection vessel 4, filtrate recovery
Device 5 connects.
During work, when slurrying is reacted, all valves of system are turned off, and the agitator of slurrying reactor 1 is opened, and are stirred anti-
Should；Filtering：Pan feeding pump 2 and pipeline are gone forward late gate unlatching, and corresponding valve is all turned on fluid hole 32, while filtrate is reclaimed
Valve opening before container 5, is filtered；Pre- elution：Corresponding valve Close All, pan feeding pump 2 and pipeline on fluid hole 32
Go forward late gate closing, while by filtration recycle vessel 5, above valve is closed, and opens the early gate of soda liquor container 6 and washing pump 9
And the valve of pipeline connection, the above valve of leacheate collection vessel 4 is then turned on, is eluted in advance；Multistage elution reaction：Open
The above valve of liquid container 7 is eluted, closes the early gate of soda liquor container 6, carries out multistage elution reaction（Note：Elute liquid container 7 and leaching
Multichamber vessel can be selected according to the property of different contaminated soils in wash pools container 4.）；Vulcanization reaction：Open sulphur
The early gate of agent container 8, elution liquid container 7 above valve is closed, carries out vulcanization reaction；Harmless treatment：Cleaning fluid is opened to hold
The early gate of device 6, the vulcanization early gate of agent container 8 is closed, carries out harmless treatment, each system valve is in closing after hours
State.
Contrast case 1：(existing conventional art)
A kind of method that heavy-metal contaminated soil press filtration elution is repaired, comprises the following steps：
（1）Crushing and screening：On the basis of certain Pb pollutes discarded place soil, total Pb levels 3.075mg/g, by the dirt
Dye soil crushed in feeding disintegrating machine, subsequently into screening system, two-stage screening is carried out, by the impurity in soil and big
The separation such as grain stone, obtain 400kg screening soil；
（2）Slurrying reaction 1：Soil after screening is pressed into solid-to-liquid ratio 1:8 carry out slurrying, and are carried out with 1.2 mol/L hydrochloric acid
Stirring reaction 30min, by soil can acid soluble heavy metal dissociate；
（3）Slurrying reaction 2：Into slurries, another step adds 25kg vulcanized sodium medicaments, stirring reaction 30min, by soil
Heavy metal fully precipitates；
(4) filter-press dehydration：By the input filtering equipment dehydration of muddy water slurries, make mud-water separation；Soil after dehydration reparation
（Soil）Backfilled (repairing effect is shown in Table 1)；
（5）Chemical precipitation：Ring waste caused by pressure-filtering process is precipitated heavy metal using vulcanized sodium；
（6）Filtering：After chemical precipitation has been handled, separation of solid and liquid is carried out, filtrate is directly discharged after processing is up to standard, and filter residue
Carry out dangerous waste landfill.
Contrast case 2：(existing conventional art)
A kind of method that heavy-metal contaminated soil press filtration elution is repaired, comprises the following steps：
（1）Crushing and screening：On the basis of certain Pb pollutes discarded place soil, total Pb levels 3.075mg/g, by the dirt
Dye soil crushed in feeding disintegrating machine, subsequently into screening system, two-stage screening is carried out, by the impurity in soil and big
The separation such as grain stone, obtain 350kg screening soil；
（2）Slurrying reaction 1：Soil after screening is pressed into solid-to-liquid ratio 1:10 carry out slurrying, and are carried out with 1.4 mol/L hydrochloric acid
Stirring reaction 30min, by soil can acid soluble heavy metal dissociate；
（3）Slurrying reaction 2：Into slurries, another step adds 20kg vulcanized sodium medicaments, stirring reaction 30min, by soil
Heavy metal fully precipitates；
(4) filter-press dehydration：By the input filtering equipment dehydration of muddy water slurries, make mud-water separation；Soil after dehydration reparation
（Soil）Backfilled (repairing effect is shown in Table 1)；
（5）Chemical precipitation：Ring waste caused by pressure-filtering process is precipitated heavy metal using vulcanized sodium；
（6）Filtering：After chemical precipitation has been handled, separation of solid and liquid is carried out, filtrate is directly discharged after processing is up to standard, and filter residue
Carry out dangerous waste landfill.
The various embodiments of the present invention of table 1. and the effect of routine techniques compare analytical table
Remarks：Embodiment 1,2 and comparative example 1,2 contaminated soils are heavy metal Pb contaminated soil, and the soil of embodiment 3 is
Pb, Cr combined contamination soil.
The surface water of table 2. and sewage discharge Pb content standards
The content that above-described embodiment illustrates should be understood to that these embodiments are only used for being illustrated more clearly that the present invention, without
For limiting the scope of the present invention, after the present invention has been read, the various equivalent form of values of the those skilled in the art to the present invention
Modification each fall within the application appended claims limited range.
Claims (10)
- A kind of 1. method of efficiently press filtration elution contaminated soil, it is characterised in that comprise the following steps：S1, heavy-metal contaminated soil is carried out to crushing and screening, and water will be added to carry out slurrying, then acid adding in the soil after crushing and screening With in soil can acid soluble heavy metal fully reacted；S2, by it is above-mentioned fully reacted slurry carry out being filtrated to get soil filter cake and filtrate in diaphragm filter press；S3, clear water is inputted in the diaphragm filter press with pump eluted in advance, the weight for making it to be remained in pore in filter cake Metal replacement is washed out；After S4, pre- elution, injected different eluent substeps is prepared according to different pollution factors in the diaphragm filter press Multistage elution reaction is carried out, eluent is fully reacted with the heavy metal in soil, different eluent total amounts are lessive 0.5-1.5 times of the theoretical response value of total metalses, input pressure 0.2-0.3MPa in earth；After S5, elution have been reacted, vulcanizing agent is squeezed into the diaphragm filter press, to remaining in the huge sum of money to dissociate in soil filter cake Category is stabilized, while the small heavy metal particles for forming stabilization procedures are migrated out in soil, input pressure 0.22- 0.35 MPa, the high 0.02-0.05MPa of input pressure is reacted relative to elution, vulcanization leaching quantity is containing water inventory in soil 50-80%；S6, most afterwards through stabilized soil in clear water or alkali lye rinsing step S5, make to residue in soil filter cake it is transportable go out Heavy metal ion or heavy metal compound or heavy metal complex further fully wash out with washing current, until eluate pH is examined Untill surveying as 6-9, the soil after being repaired.
- 2. the method for efficiently press filtration elution contaminated soil according to claim 1, it is characterised in that in step S1, slurrying When soil and water solid-to-liquid ratio 1:3-1：5.
- 3. the method for efficiently press filtration elution contaminated soil according to claim 1, it is characterised in that in step S2, filtering Pressure is 0.2-0.5MPa, filter cake thickness 2.5-3.5cm, filter cake moisture content 70-80%.
- 4. the method for efficiently press filtration elution contaminated soil according to claim 1, it is characterised in that in step S3, pre-leaching The input pressure of clear water is 0.2-0.3 MPa when washing, and leaching quantity is the 50-100% containing water inventory in soil filter cake.
- 5. the method for efficiently press filtration elution contaminated soil according to claim 1, it is characterised in that will be more in step S4 Heavy metal is precipitated or flocculated using ring waste recycling medicament by ring waste caused by level elution course of reaction, Separation of solid and liquid is carried out after being disposed, filtrate can return to and slurrying is carried out in step S1, and filter residue carries out follow-up resource reclaim or entered Row dangerous waste fills.
- 6. the method for efficiently press filtration elution contaminated soil according to claim 5, it is characterised in that the ring waste returns Receipts treatment agent is the one or more in sulphurizing salt, metal chloride, highly basic and weak base.
- 7. the method for efficiently press filtration elution contaminated soil according to claim 1, it is characterised in that in step S6, input Pressure is 0.2-0.3 MPa, and leaching quantity is the 50%-80% containing water inventory in soil filter cake.
- 8. the method for efficiently press filtration elution contaminated soil according to claim 1, it is characterised in that the acid in step S1 is Refer at least one of sulfuric acid, hydrochloric acid and citric acid.
- 9. the remediating heavy metal used in a kind of method of efficient press filtration elution contaminated soil as described in one of claim 1-8 is dirty Contaminate soil treatment system, it is characterised in that including- slurrying reactor（1）, in the soil after crushing and screening water will be added to carry out slurrying；- diaphragm filter press（3）, it has plup inlet（31）With multiple fluid holes（32）；- soda liquor container（6）；- elution liquid container（7）；- vulcanization agent container（8）；- leacheate collection vessel（4）；And- filtration recycle vessel（5）；The slurrying reactor（1）The port of export pass through pipeline and pan feeding pump（2）Entrance point connection, the pan feeding pump（2）Go out Mouth end and the plup inlet of the diaphragm filter press（31）Connection；The soda liquor container（6）, elution liquid container（7）With vulcanization agent container（8）Pass through pipeline and washing pump respectively（9）Enter The connection of mouth end, washing pump（9）The port of export pass through multiple fluid holes of pipeline and the diaphragm filter press（32）In a part Connection, multiple fluid holes of the diaphragm filter press（32）In a part pass through pipeline and leacheate collection vessel（4）, filtrate return Receptacle（5）Connection；The slurrying reactor（1）, leacheate collection vessel（4）, filtration recycle vessel（5）, soda liquor container（6）, leacheate Container（7）, vulcanization agent container（8）, pan feeding pump（2）, washing pump（9）And diaphragm filter press（3）Connecting pipe on be equipped with Corresponding control valve.
- A kind of 10. control method of restoration of soil polluted by heavy metal processing system as claimed in claim 9, it is characterised in that bag Include following steps：1）When heavy metal contaminated soil carries out slurrying reaction, slurrying reactor is closed（1）Valve on discharge end pipeline；2）When slurrying filters after completion of the reaction, pan feeding pump is opened（2）Valve on the port of export and entrance point pipeline, diaphragm filter press （3）Each fluid hole（32）Valve corresponding to upper is all turned on, while filtration recycle vessel（5）Feed end pipeline on valve Open, filtered；3）During pre- elution, by diaphragm filter press（3）Each fluid hole（32）Valve Close All corresponding to upper, closes pan feeding pump （2）Valve on the port of export and entrance point pipeline, while by filtration recycle vessel（5）Feed end pipeline on valve close, Open soda liquor container（6）Valve and washing pump on port of export pipeline（9）Valve on pipeline, it is then turned on leacheate and collects appearance Device（4）Valve on feed end pipeline, is eluted in advance；4）When carrying out multistage elution reaction：Open elution liquid container（7）Discharge end pipeline on valve, close soda liquor container （6）Valve on port of export pipeline, carry out multistage elution reaction；5）During vulcanization reaction, vulcanization agent container is opened（8）Valve on discharge end pipeline, close elution liquid container（7）Discharge end Valve on pipeline, carry out vulcanization reaction；6）During harmless treatment, soda liquor container is opened（6）Valve on port of export pipeline, close vulcanization agent container（8）Discharging Valve on end pipe road, harmless treatment is carried out, each valve is in closed mode after hours.
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| CN106734101A (en) * | 2016-12-29 | 2017-05-31 | 常州赛蓝光伏技术有限公司 | Useless silicon mud recycling and processing device |
| CN107583947A (en) * | 2017-08-17 | 2018-01-16 | 天津华勘环保科技有限公司 | Heavy-metal contaminated soil builds heap cycling elution restorative procedure |
| CN107309263B (en) * | 2017-08-21 | 2019-11-22 | 张晨 | High concentration, complete circulation type soil, in solid waste pollutant chemical leaching separation method and its separation system |
| CN109332347A (en) * | 2018-08-31 | 2019-02-15 | 江苏天楹环保能源成套设备有限公司 | A kind of waste incineration flying ash washing dechlorination method and its dechlorination system |
| CN110465124A (en) * | 2019-08-21 | 2019-11-19 | 利得环境科技（北京）有限公司 | A kind of diaphragm filter press cleaning system |
| CN112142281B (en) * | 2020-09-09 | 2022-09-30 | 朱栋梁 | Contaminated fluid treatment system |
| CN112028424B (en) * | 2020-09-09 | 2022-09-06 | 季丹萍 | Waste treatment process |
| CN114369464A (en) * | 2022-01-11 | 2022-04-19 | 上海同济工程咨询有限公司 | Composite eluting agent for repairing heavy metal contaminated soil and repairing method |
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| CN102601106B (en) * | 2012-03-08 | 2014-12-24 | 中国科学院过程工程研究所 | Ectopic leaching restoring device and restoring method for chromic slag polluted soil |
| 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 |
| KR101375482B1 (en) * | 2013-05-24 | 2014-03-18 | 현대건설주식회사 | System and method for remediation of highly concentrated soil by continuous sequential advanced??separation and heavy metals removal process |
| CN103316907B (en) * | 2013-06-07 | 2015-07-15 | 东江环保股份有限公司 | Heavy-metal-polluted site soil leaching remediation method and device |
| CN103861867B (en) * | 2014-02-19 | 2016-01-13 | 江苏日升环保工程有限公司 | A kind of elution method soil remediation technique |
| CN104014583B (en) * | 2014-06-10 | 2016-01-20 | 苏州同和环保工程有限公司 | A kind of heavy-metal contaminated soil drip washing and heavy metal enrichment method and equipment thereof |
| CN104226678B (en) * | 2014-09-05 | 2016-08-24 | 周昱 | A kind of heavy-metal contaminated soil restorative procedure and equipment thereof |
| CN104525556B (en) * | 2014-12-26 | 2017-05-17 | 北京中持绿色能源环境技术有限公司 | Movable device and movable method for leaching composite polluted soil |
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