CN208288666U - A kind of green is recycled to soil pollution by heavy metal device - Google Patents
A kind of green is recycled to soil pollution by heavy metal device Download PDFInfo
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- CN208288666U CN208288666U CN201820226669.6U CN201820226669U CN208288666U CN 208288666 U CN208288666 U CN 208288666U CN 201820226669 U CN201820226669 U CN 201820226669U CN 208288666 U CN208288666 U CN 208288666U
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Abstract
The utility model discloses a kind of devices that soil pollution by heavy metal is recycled to for green, and described device includes: heavy metal in soil leaching equipment, active carbon adsorption material preparation facilities, carbon dioxide preparation facilities.Using the device, method and green leachant " CO are soaked by ground2+O2" achieve the purpose that efficient process heavy metal pollution of soil.This method has strong operability, feature without secondary pollution.It active carbon is prepared using stalk can make full use of the natural resources and improve crops utilization efficiency, the active carbon that heavy metal in soil leaches adsorption saturation in process, which carries out oxygen-enriched combusting, can provide the carbon dioxide that heavy metal in soil leaches needs, so that forming carbon cycle utilizes environmentally protective technical process.
Description
Technical field
The utility model belongs to remediation contaminated soil technical field, and in particular to a kind of green is recycled to huge sum of money dependent territory
Earth polluting device.
Background technique
With a large amount of development and utilization of mineral resources, industrial fast development and various chemical products, pesticide and change
Fertilizer is widely used, and the pollutant containing heavy metal enters environment by all means, causes soil, especially an agricultural land soil huge sum of money
Belong to pollution to get worse.Currently, countries in the world soil, there are different degrees of pollution, Hg about 1.5 is discharged in the whole world every year on average
About 3,400,000 about 5,000,000 about 1 500 ten thousand t, Ni about 100t of t, Mn of t, Pb of × 104t, Cu.In Europe, by the farmland of heavy metal pollution
There are millions of hectares；Japan by the pollutions such as Cd, Cu, As farmland area be 7224hm2.Current China by Cd, Hg, As,
Cultivated area about 2 000 × 104hm of Cr, Pb pollution2, the grain lost every year by heavy metal pollution about 1 000 × 104t,
Contaminated grain up to 1 200 × 104t, economic loss are at least up to 200 × 108 yuan.
Currently, countries in the world mainly include physics, chemistry, biology, agricultural to farmland soil heavy metals pollution remediation technology
Ecology and combined remediation technology etc..
Peripheral doses technology
Peripheral doses technology mainly includes engineering measure (soil moved in improve the original, soil removal and replacement and deep ploughing are digged) and thermal desorption.Engineering measure tool
Have the advantages that thorough, stable, but project amount is big, investment is high, and destructible soil structures cause soil fertility to decline, to avoid two
Secondary pollution will also focus on contaminated soil.Therefore, it is only applicable to the reparation of the serious contaminated soil of small area；Heat is de-
Attached heated to contaminated soil, has volatile heavy metal if Hg, As, Se etc. in soil from desorbing for some
A kind of method, this method simple process, but energy consumption is high, and operating cost is high, and is only applicable to volatile pollutant, the gas of desorption
Body need to collect processing.
Chemical remediation technology
Chemical remediation technology includes electro reclamation, elution technique, stabilization/solidification recovery technique.
Electro reclamation is to form electric-force gradient, heavy metal in soil pollution by applying DC voltage in contaminated soil two sides
Object is brought to electrode both ends under electric field action by way of electromigration, electroosmotic flow or electrophoresis, then carries out at centralized collection
Reason, thus cleaning soil.Clay and silt soil of this method particularly suitable for hyposmosis, can control the flowing side of pollutant
To.Currently, Pool body design, electrokinetic process and its mechanism, in terms of carried out some exploration sex works.Electricity
Dynamic reparation is a kind of based technique for in-situ remediation, can remove removing heavy metals and organic pollutant simultaneously, not stir soil layer, is easy to operate, place
It manages high-efficient, is a kind of economically viable recovery technique, but easily lead to soil physico-chemical property variation.Electrokinetic remediation efficiency may be because
Soil surface particle is adsorbed to pollutant and electrode both ends H+(anode) and OH-(cathode) aggregation is influenced and is reduced.Since soda acid can
Cause soil physico-chemical property to change, adds such as chelating agent, complexing agent, surfactant and oxidation/reduction agent (H2O2、
NaMnO4、KMnO4、 Fe0), it is allowed to form stable state and the soluble compound in pH wider range with heavy metal, passes through enhancing soil
Heavy metals mobilization achievees the purpose that efficiently to remove in earth.Research finds electric driving method removal effect is good and economic benefit height etc. is excellent
While point, there are still shortcomings, such as system acidification to lead to reverse osmosis flow phenomenon；Deposited phenomenon easily occurs in alkalinity band；Soil
In certain pollutants be difficult to the problems such as parsing.
Soil leaching technology is by water or the chelating agent (citric acid, EDTA, DTPA, EDDS) containing rinse aid, acid/base
Solution (H2SO4、HNO3), complexing agent (acetic acid, ammonium acetate, cyclodextrin), surfactant (APG, SDS, SDBS, DDT, sandlwood
Glycolipid) etc. eluents be injected into contaminated soil or deposit, elution and cleaning pollutant in soil process.The pass of the technology
Key is to find one kind to extract the heavy metal of various forms and destroy the leacheate of soil texture.Studies have shown that
0.1mol·L-1For HCl as eluent, the removal rate to Cu, Ni, Pb, Zn is respectively 92%, 77%, 79%, 75%；Commonly
Artificial chelating agent, as ethylenediamine tetra-acetic acid (EDTA) is attained by ideal elution effect to Pb and Cd.A large amount of engineering practice tables
Bright, Soil leaching technology is a kind of fast and efficiently method.The poor soil remediation effect of weight viscous for geology, permeability
It is poor.Efficient eluent is expensive, and elution waste liquid may cause the secondary pollution of soil and groundwater.Currently, can scale
The Soil leaching technology and development of complete equipment of application relatively lag behind, it would be highly desirable to further increase and perfect.
Stabilization/curing soil recovery technique, which refers to, fixes noxious pollutant in soil with method physically or chemically
Come, or pollutant is converted to the inactive form of chemical property, prevents it from activities such as migrating, spread in the environment, to drop
The recovery technique of the murder by poisoning degree of low pollution substance.Common Curing Agents are divided into 4 classes: inorganic bond substance (such as cement, lime),
Organic binder (such as pitch thermoplastic material), thermmohardening organic polymer (such as urea, phenoplasts and epoxides),
Glassy substances.Chemistry is fixed mainly by the way that chemical agent or material is added, and is formed between heavy metal using it insoluble
Or poor mobility, small toxicity substance and reduce its biological effectiveness and migration in the soil.Existing a large amount of improvement material
Material, as Multimetal oxide, clay mineral, organic matter, macromolecule polymeric material, biomaterial are applied.The pass of the technology
Key is to find cheap and environmental-friendly modifying agent.Stabilization/curing soil recovery technique is in-situ immobilization, simple and easy,
But it is not a kind of permanent reclamation activities, because only changing the existing forms of heavy metal, heavy metal element is remained in soil,
It is easy reactivation and generates secondary pollution.
Bioremediation technology
It is biological prosthetic to refer to using specific bio-absorbable, conversion, removing or degradation environmental contaminants, realize that environment is net
Change, the biological control measure that ecological effect is restored, mainly includes phytoremediation, microorganism remediation and animal reparation.This method is because having
At low cost, easy to operate, without secondary pollution, high treating effect and the advantages that can be widely applied, mechanism study and is answered
It is concerned with prospect.
Phytovolatilization is to absorb metal using root system of plant, is translated into gaseous material and evaporate into atmosphere, to reduce
Soil pollution, but easily cause secondary pollution.Microorganism remediation is to heavy metal adsorption or to be converted into low toxicity using active microorganism
Product, to reduce heavy metal pollution degree.But microorganism individual is small, it is difficult to separate from soil, there is also existing with reparation
Field indigenous strain competition etc..Agro-ecology is repaired main include two aspect: one is to agronomy reclamation activities.Second is that restoration of the ecosystem.
The advantages that technology maturation, cost is relatively low, smaller to soil environment disturbance, but repairing efficiency is long, and effect is not significant.
3.5 combined remediation technology
Studying more United Technologies at present includes bio combined technology, physical chemistry United Technologies and physical chemistry-life
Object United Technologies.The technology rests on the laboratory research stage more, and technological means is immature.
The above-mentioned prior art has the disadvantage in that
1, energy consumption is high, and operating cost is high；
2, can scale application Soil leaching technology and development of complete equipment relatively lag behind；
3, it is easy reactivation and generates secondary pollution；
4, repairing efficiency is long, and effect is not significant.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, a kind of green is provided and is recycled to huge sum of money dependent territory
The method and device of earth pollution, this method can achieve efficient process heavy metal pollution of soil purpose, and can recycle straw
The biomass resources such as stalk.
A kind of method that green is recycled to soil pollution by heavy metal, which is characterized in that this method includes below scheme:
Heavy metal in soil leaches process: step 1. carbon dioxide and oxygen is passed through liquid injecting pipeline, according to carbon dioxide and
The volume ratio of oxygen is that 3:1 is configured to leachant,
Step 2. prepares the leachant completed and is drilled by well site collection control with each fluid injection is distributed to after flow,
Leaching solution described in step 3. flows through contaminated soil horizon for the Leaching of Heavy Metals in soil, and leachate passes through immersible pump
From contaminated soil horizon, drawing liquid branch pipe is promoted to earth's surface along production well,
Leachate in each drawing liquid branch pipe of step 4. summarizes after liquid collecting, then by filter progress by solid therein
Particulate matter removal,
Step 5. enters heavy metal recovery process by the leachate of filter progress, the heavy metal recovery process use from
The leachate of sub-exchange resin absorption and active carbon absorption technology heavy-metal ion removal, heavy-metal ion removal becomes tail washings,
Return step 1 reenters preparation process；
Active carbon adsorption material preparation flow: agricultural stalk is modified and prepares active carbon adsorption material by carbonization, prepares
The obtained absorbent charcoal material is applied to active carbon absorption technology described in the leachate heavy metal recovery process；
Carbon dioxide preparation flow: the active carbon of adsorption saturation is laggard by dryness in the sun in the active carbon absorption technology
Row oxygen-enriched combusting, the tail gas after collecting burning, the tail gas obtain carbon dioxide gas, the carbon dioxide by washing, purifying
Gas is for preparing the leachant.
In above-mentioned technical proposal, the carbon dioxide gas injects fluid injection general pipeline, the oxygen after the measurement of gas flow
It after the measurement of gas flow, flows directly into each fluid injection drilling branch pipe(tube), the amount of carbon dioxide dissolved in the leaching solution
For 200~400mg/L, remaining oxygen content is 30~60mg/L to the leachate in the middle.
In above-mentioned technical proposal, the active carbon adsorption material preparation flow be agricultural stalk crushing be length 1~
10cm particle, the particle are placed in alkali in 1~5wt%NaOH solution and soak 24~72h, then take out and be washed with water to neutrality,
The particle after washing is dried, by the particle after drying in 0.01~0.5g/mL (NH4)2HPO4It is impregnated in solution
24~36h, the particle and the (NH4)2HPO4Solution quality ratio is 1:5, and the particle is dried at 100-120 DEG C after dipping,
The particle after drying again pre-oxidizes 1~3h at 120~180 DEG C in air, the particle by pre-oxidation 500~
It is activated under 800 DEG C of nitrogen protections, in 20~30 DEG C/min, activation time is 50~60min for rate of heat addition control.
In above-mentioned technical proposal, the carbon dioxide preparation flow is by adsorption saturation in the active carbon absorption technology
Active carbon carries out oxygen-enriched combusting with 1000-1200kg/h, and removal impurity is washed with water in the carbon dioxide gas that oxygen-enriched combusting generates,
Carbon dioxide gas is obtained by washing, purifying, the carbon dioxide gas is for preparing the leachant.
In above-mentioned technical proposal, the heavy metal recovery process further includes ion exchange resin elution desorption process and ion
Exchanger resin step for regeneration.
A kind of device for the above method, which is characterized in that described device includes:
Heavy metal in soil leaching equipment: match liquid pool (1), the first centrifugal pump (2), well site central station of floating dock (3), carbon dioxide stream
Meter (6), liquid oxygen basin (7), oxygen gasified device (8), oxygen flow meter (9), fluid injection drill (10), production well
(11), immersible pump (12), collecting tank (13), filter (14), ion exchange tower (15), the second centrifugal pump (16) active carbon are inhaled
Attached tower (18)；The wherein outlet with liquid pool (1) is connected to the import of the first centrifugal pump (2) using pipeline, described first from
The outlet connection fluid injection general pipeline of heart pump (2) enters the well site central station of floating dock (3) and is divided into note identical with the fluid injection hole number
Liquid drilling branch pipe, the fluid injection drilling branch pipe connect the fluid injection drilling (10), and the immersible pump (12) is arranged in the drawing liquid
The bottom of drilling (11), the outlet of the immersible pump (12) is connected to the entrance of collecting tank (13), the collecting tank by pipeline
(13) outlet is connected to the entrance of the second centrifugal pump (16), the outlet of the second centrifugal pump (16) and the filter by pipeline
(14) inlet duct is connected, and the outlet of said filtration device (14) is connected with the inlet duct of the ion exchange tower (15), institute
The outlet for stating ion exchange tower (15) is connected with the activated carbon adsorber (18) inlet duct, the activated carbon adsorber (18)
It is connected with the inlet duct with liquid pool (1)；
Active carbon adsorption material preparation facilities: pulverizer (19), drying machine (20), retort (21), the pulverizer
(19) outlet is connected to the drying machine (20) entrance by conveying equipment, and drying machine (20) outlet passes through conveying equipment
It is connected to the retort (21) entrance；
Carbon dioxide preparation facilities: the first air blower (22), combustion tower (23), the second air blower (24), scrubbing tower (25),
First air blower (22) outlet is connected to the combustion tower (23) gas phase entrance, combustion tower (23) gas by pipeline
Mutually outlet is connected with the second air blower (24) inlet duct, and the second air blower (24) outlet is connected to institute by pipeline
The gas phase entrance of scrubbing tower (25) lower part is stated, scrubbing tower (25) the upper gaseous phase outlet is connected to the titanium dioxide by pipeline
Carbon flow meter (6).
In above-mentioned technical proposal, flow indication and adjustment equipment, the pumping are set on the every fluid injection drilling branch pipe
UPVC material casing is arranged in liquid drilling and fluid injection bore inner.
In above-mentioned technical proposal, the filter is bag filter, and filter process is filtered using two-stage difference is no less than
The filter series connection of precision is filtered, and the ion exchange tower cascade connection, the ion exchange tower quantity is not less than
3。
In above-mentioned technical proposal, fluid injection drilling and the production well arrangement form can for four-point, five-point type,
The quantity ratio of seven point types and/or determinant, fluid injection drilling and the production well is 1:(1~3), the production well with
The distance between fluid injection drilling is 10~20m, and the depth that the production well and fluid injection drill is 30cm~100cm, is in addition existed
The zone boundary for carrying out heavy metal pollution of soil processing is needed to be additionally provided with inspection well (17).
In above-mentioned technical proposal, the first air blower (22) power is 1~1.5KW, the second air blower (24) function
Rate is 6~7KW.
It the advantages of the utility model and has the beneficial effect that
The purpose of this utility model is to provide a kind of method and device of novel processing heavy metal-polluted soil, by using
Soak method and green leachant " CO in ground2+O2" achieve the purpose that efficient process heavy metal pollution of soil."CO2+O2" the molten leaching of green
Agent can be improved heavy metal-polluted soil activity, promote migration, increase harmful heavy metal transformation activity in soil, in conjunction with drilling
Ground soaks to achieve the purpose that remove heavy metal in soil, and this method has strong operability, without secondary pollution.Stalk is as a kind of life
Substance carbon carrier, recycles in the present invention, can sufficiently, efficiently utilize natural resources, will to the influence of environment drop
To minimum.
Detailed description of the invention
Fig. 1 is the process flow chart that a kind of green is recycled to soil pollution by heavy metal.
Fig. 2 is the schematic diagram of the utility model embodiment one.
Fig. 3 is the schematic diagram of the utility model embodiment two.
Fig. 4 is the utility model fluid injection drilling and the production well arrangement form schematic diagram.
Wherein:
1: match liquid pool, 2: the first centrifugal pumps, 3: well site central station of floating dock, 6: carbon dioxide stream meter, 7: liquid oxygen basin,
8: oxygen gasified device, 9: oxygen flow meter, 10: fluid injection drilling, 11: production well, 12: immersible pump, 13: collecting tank, 14: filtering
Device, 15: ion exchange tower, 16: the second centrifugal pumps, 17: inspection well, 18: activated carbon adsorber, 19: pulverizer, 20: drying machine,
21: retort, 22: the first air blowers, 23: combustion tower, 24: the second air blowers, 25 scrubbing towers.
A: four-point fluid injection drilling, production well arrangement, b: five-point type fluid injection drilling, production well arrangement, c: seven point types
Fluid injection drilling, production well arrangement, d: determinant fluid injection drilling, production well arrangement.
It for those of ordinary skill in the art, without creative efforts, can be according to above attached
Figure obtains other relevant drawings.
Specific embodiment
In order to make those skilled in the art better understand the scheme of the utility model, combined with specific embodiments below into one
Step illustrates the technical solution of the utility model.
Embodiment one
Heavy metal in soil leaching equipment, including match liquid pool (1), the first centrifugal pump (2), well site central station of floating dock (3), titanium dioxide
Carbon flow meter (6), liquid oxygen basin (7), oxygen gasified device (8), oxygen flow meter (9), fluid injection drill (10), production well
(11), immersible pump (12), collecting tank (13), filter (14), ion exchange tower (15), the second centrifugal pump (16)；It is wherein described
Outlet with liquid pool (1) is connected to the import of the first centrifugal pump (2), the outlet connection of first centrifugal pump (2) using pipeline
Fluid injection general pipeline enters the well site central station of floating dock (3) and is divided into fluid injection drilling branch pipe identical with the fluid injection hole number, the note
Liquid drilling branch pipe connects the fluid injection drilling (10), and immersible pump (12) setting, should in the bottom of the production well (11)
The outlet of immersible pump (12) is connected to the entrance of collecting tank (13) by pipeline, and the outlet of the collecting tank (13) is connected by pipeline
It is connected to the entrance of the second centrifugal pump (16), the outlet of the second centrifugal pump (16) is connected with the inlet duct of the filter (14),
The outlet of said filtration device (14) is connected with the inlet duct of the ion exchange tower (15), and the ion exchange tower (15) goes out
Mouth is connected with the activated carbon adsorber (18) inlet duct, the activated carbon adsorber (18) and the entering with liquid pool (1)
Mouth pipeline is connected.
Active carbon adsorption material preparation facilities: pulverizer (19), drying machine (20), retort (21), the pulverizer
(19) outlet is connected to the drying machine (20) entrance by conveying equipment, and drying machine (20) outlet passes through conveying equipment
It is connected to the retort (21) entrance；
Carbon dioxide preparation facilities: power is the first air blower (22) of 1kW, and combustion tower (23), power is the second of 6kW
Air blower (24), scrubbing tower (25), the first air blower (22) outlet are connected to the combustion tower (23) gas phase by pipeline
Entrance, combustion tower (23) gaseous phase outlet are connected with the second air blower (24) inlet duct, second air blower
(24) outlet is connected to the gas phase entrance of the scrubbing tower (25) lower part, scrubbing tower (25) the upper gaseous phase outlet by pipeline
The carbon dioxide stream meter (6) is connected to by pipeline.
Flow indication and adjustment equipment are set on the every fluid injection drilling branch pipe, the filter is bag type filtering
Device, filter process are filtered using the filter series connection of two-stage difference filtering accuracy.After ion exchange tower is using the series connection of 3 towers
Activated carbon adsorber of connecting carries out heavy metal ion adsorbed.Position centered on fluid injection drilling and the production well arrangement form
Seven point types are set, corner part is arranged using quincunx or determinant.The quantity ratio of fluid injection drilling and the production well is 1:
2.5, it further include being arranged inspection well totally 8 in the zone boundary for needing to carry out heavy metal pollution of soil processing.Production well and note
The distance between liquid drilling is 15m, and UPVC material casing is arranged in the production well and fluid injection bore inner.
Carbon dioxide enters fluid injection general pipeline after the metering of carbon dioxide stream meter, and fluid injection general pipeline leads in the central station of floating dock of well site
To different fluid injections drilling branch pipe, the oxygen after gasification is passed through fluid injection after oxygen flow meter measures for distribution after the control of overcurrent meter
Drilling branch pipe is configured into leachant and is passed through each fluid injection drilling；
The leaching solution flows through contaminated soil horizon for the Leaching of Heavy Metals in soil, and leachate is by immersible pump from dirty
Dye soil horizon drawing liquid branch pipe along production well is promoted to earth's surface；Leachate in each drawing liquid branch pipe summarizes into liquid collecting
Pond, the leachate in collecting tank by the second centrifugal pumping to the concatenated bag filter of two-stage different accuracy, by filter progress
Solid particulate matter therein is removed；Enter heavy metal recovery process by the leachate of filter progress, passes through three series connection works
One activated carbon adsorber heavy-metal ion removal of series connection after the ion exchange tower of work, activated carbon adsorber export adsorption tail liquid
It returns to and continues to prepare leachate with liquid pool reuse.
The amount of carbon dioxide wherein dissolved in leaching solution is 300mg/L, and remaining oxygen content is 50mg/L in the leachate.
Active carbon adsorption material preparation flow: agricultural stalk is ground into granularity to be modified and preparing active carbon suction by carbonization
Enclosure material, the absorbent charcoal material being prepared are applied to activated carbon adsorption described in the leachate heavy metal recovery process
Technique；
In above-mentioned technical proposal, the active carbon adsorption material preparation flow is that the agricultural stalk passes through pulverizer (19)
Crushing is length 1cm particle, and the particle is placed in alkali leaching in 1wt%NaOH solution and for 24 hours, then takes out in being washed with water to
Property, the particle after washing carries out the drying in drying machine (20), by the particle after drying in 0.01g/mL (NH4)2HPO4It is impregnated in solution for 24 hours, the particle and the (NH4)2HPO4Solution quality ratio is 1:5, and the particle is 100 after dipping
DEG C drying, again dry after the particle pre-oxidize 3h at 120 DEG C in air in carbide furnace (21), by of pre-oxidation
Grain is activated under 500 DEG C of nitrogen protections, and the rate of heat addition is controlled in 20 DEG C/min, activation time 60min.
In above-mentioned technical proposal, the carbon dioxide preparation flow is by adsorption saturation in the active carbon absorption technology
Active carbon mixes progress oxygen-enriched combusting to be blown into air in 1000kg/h investment combustion tower (23) with the first air blower (22), oxygen-enriched
The carbon dioxide gas that burning generates is sent into scrubbing tower (25) bottom by the second air blower (24) and removes impurity by water washing,
Carbon dioxide gas is obtained by washing, purifying, the carbon dioxide gas is sent to carbon dioxide stream meter (6) for preparing institute
State leachant.
The heavy metal recovery process further includes ion exchange resin elution desorption process and ion exchange resin regeneration work
Sequence.
Embodiment two
Heavy metal in soil leaching equipment, including match liquid pool (1), the first centrifugal pump (2), well site central station of floating dock (3), titanium dioxide
Carbon gas source (4), carbon dioxide stream meter (6), liquid oxygen basin (7), oxygen gasified device (8), oxygen flow meter (9), fluid injection
Drill (10), production well (11), immersible pump (12), collecting tank (13), filter (14), ion exchange tower (15), second from
Heart pump (16), activated carbon adsorber (18)；Wherein the outlet with liquid pool (1) is connected to the first centrifugal pump (2) using pipeline
Import, the outlet connection fluid injection general pipeline of first centrifugal pump (2), which enters, the well site central station of floating dock (3) and to be divided into and the note
The identical fluid injection drilling branch pipe of fluid apertures quantity, the fluid injection drilling branch pipe connect the fluid injection drilling (10), the immersible pump
(12) it is arranged in the bottom of the production well (11), the outlet of the immersible pump (12) is connected to collecting tank (13) by pipeline
The outlet of entrance, the collecting tank (13) is connected to the entrance of the second centrifugal pump (16) by pipeline, the second centrifugal pump (16)
Outlet is connected with the inlet duct of the filter (14), outlet and the ion exchange tower (15) of said filtration device (14)
Inlet duct is connected, and the outlet of the ion exchange tower (15) is connected with the activated carbon adsorber (18) inlet duct, described
Activated carbon adsorber (18) is connected with the inlet duct with liquid pool (1).
Active carbon adsorption material preparation facilities: pulverizer (19), drying machine (20), retort (21), the pulverizer
(19) outlet is connected to the drying machine (20) entrance by conveying equipment, and drying machine (20) outlet passes through conveying equipment
It is connected to the retort (21) entrance；
Carbon dioxide preparation facilities: power is the first air blower (22) of 1.5kW, and combustion tower (23), power is 6.5kW's
Second air blower (24), scrubbing tower (25), the first air blower (22) outlet are connected to the combustion tower (23) by pipeline
Gas phase entrance, combustion tower (23) gaseous phase outlet are connected with the second air blower (24) inlet duct, second air blast
Machine (24) exports the gas phase entrance that the scrubbing tower (25) lower part is connected to by pipeline, and scrubbing tower (25) upper gaseous phase goes out
Mouth is connected to the carbon dioxide stream meter (6) by pipeline.
Flow indication and adjustment equipment are set on the every fluid injection drilling branch pipe, the filter is bag type filtering
Device, filter process are filtered using the filter series connection of second level difference filtering accuracy.After ion exchange tower is using the series connection of 4 towers
Activated carbon adsorber form of connecting carries out heavy metal ion adsorbed.Fluid injection drilling and during the production well arrangement form is
Seven point type of heart position, corner part are arranged using four point-type or determinant.Fluid injection drilling and the quantity ratio of the production well are
1:2.25 further includes being arranged inspection well totally 10 in the zone boundary for needing to carry out heavy metal pollution of soil processing.Production well
The distance between fluid injection drilling is 10m, and UPVC material casing is arranged in the production well and fluid injection bore inner.
Carbon dioxide enters fluid injection general pipeline after the metering of carbon dioxide stream meter, and fluid injection general pipeline leads in the central station of floating dock of well site
To different fluid injections drilling branch pipe, the oxygen after gasification is passed through fluid injection after oxygen flow meter measures for distribution after the control of overcurrent meter
Drilling branch pipe is configured into leachant and is passed through each fluid injection drilling；
The leaching solution flows through contaminated soil horizon for the Leaching of Heavy Metals in soil, and leachate is by immersible pump from dirty
Dye soil horizon drawing liquid branch pipe along production well is promoted to earth's surface；Leachate in each drawing liquid branch pipe summarizes into liquid collecting
Pond, the leachate in collecting tank by the second centrifugal pumping to the concatenated bag filter of second level different accuracy, by filter progress
Solid particulate matter therein is removed；Enter heavy metal recovery process by the leachate of filter progress, passes through 4 tandem workings
Ion exchange tower after connect an activated carbon adsorber heavy-metal ion removal, activated carbon adsorber export adsorption tail liquid weight
New return continues to prepare leachate with liquid pool reuse.
The amount of carbon dioxide wherein dissolved in leaching solution is 200mg/L, and remaining oxygen content is 60mg/L in the leachate.
Active carbon adsorption material preparation flow: agricultural stalk is ground into granularity to be modified and preparing active carbon suction by carbonization
Enclosure material, the absorbent charcoal material being prepared are applied to activated carbon adsorption described in the leachate heavy metal recovery process
Technique；
In above-mentioned technical proposal, the active carbon adsorption material preparation flow is that the agricultural stalk passes through pulverizer (19)
Crushing is length 5cm particle, and the particle is placed in alkali in 3wt%NaOH solution and soaks 36h, is then taken out in being washed with water to
Property, the particle after washing carries out the drying in drying machine (20), by the particle after drying in 0.3g/mL (NH4)2HPO430h, the particle and the (NH are impregnated in solution4)2HPO4Solution quality ratio is 1:5, and the particle is 110 after dipping
DEG C drying, again dry after the particle pre-oxidize 2h at 150 DEG C in air in carbide furnace (21), by of pre-oxidation
Grain is activated under 700 DEG C of nitrogen protections, and the rate of heat addition is controlled in 25 DEG C/min, activation time 55min.
In above-mentioned technical proposal, the carbon dioxide preparation flow is by adsorption saturation in the active carbon absorption technology
Active carbon mixes progress oxygen-enriched combusting to be blown into air in 1100kg/h investment combustion tower (23) with the first air blower (22), oxygen-enriched
The carbon dioxide gas that burning generates is sent into scrubbing tower (25) bottom by the second air blower (24) and removes impurity by water washing,
Carbon dioxide gas is obtained by washing, purifying, the carbon dioxide gas is sent to carbon dioxide stream meter (6) for preparing institute
State leachant.
The heavy metal recovery process further includes ion exchange resin elution desorption process and ion exchange resin regeneration work
Sequence.
Embodiment three
Heavy metal in soil leaching equipment, including match liquid pool (1), the first centrifugal pump (2), well site central station of floating dock (3), liquid two
Carbonoxide basin (4), carbon dioxide gasification device (5), carbon dioxide stream meter (6), liquid oxygen basin (7), oxygen gasified device
(8), oxygen flow meter (9), fluid injection drill (10), production well (11), immersible pump (12), collecting tank (13), filter (14),
Ion exchange tower (15), the second centrifugal pump (16)；Wherein the outlet with liquid pool (1) is connected to the first centrifugal pump using pipeline
(2) the outlet connection fluid injection general pipeline of import, first centrifugal pump (2) enters the well site central station of floating dock (3) and is divided into and institute
The identical fluid injection drilling branch pipe of fluid injection hole number is stated, the fluid injection drilling branch pipe connects the fluid injection drilling (10), the diving
It pumps (12) to be arranged in the bottom of the production well (11), the outlet of the immersible pump (12) is connected to collecting tank (13) by pipeline
Entrance, the outlet of the collecting tank (13) is connected to the entrance of the second centrifugal pump (16), the second centrifugal pump (16) by pipeline
Outlet be connected with the inlet duct of the filter (14), the outlet of said filtration device (14) and the ion exchange tower
(15) inlet duct is connected, outlet and the activated carbon adsorber (18) the inlet duct phase of the ion exchange tower (15)
Even, the activated carbon adsorber (18) is connected with the inlet duct with liquid pool (1).
Active carbon adsorption material preparation facilities: pulverizer (19), drying machine (20), retort (21), the pulverizer
(19) outlet is connected to the drying machine (20) entrance by conveying equipment, and drying machine (20) outlet passes through conveying equipment
It is connected to the retort (21) entrance；
Carbon dioxide preparation facilities: power is the first air blower (22) of 1.5kW, and combustion tower (23), power is 6.5kW's
Second air blower (24), scrubbing tower (25), the first air blower (22) outlet are connected to the combustion tower (23) by pipeline
Gas phase entrance, combustion tower (23) gaseous phase outlet are connected with the second air blower (24) inlet duct, second air blast
Machine (24) exports the gas phase entrance that the scrubbing tower (25) lower part is connected to by pipeline, and scrubbing tower (25) upper gaseous phase goes out
Mouth is connected to the carbon dioxide stream meter (6) by pipeline.
Flow indication and adjustment equipment are set on the every fluid injection drilling branch pipe, the filter is bag type filtering
Device, filter process are filtered using the filter series connection of second level difference filtering accuracy.After ion exchange tower is using the series connection of 5 towers
It is heavy metal ion adsorbed that 2 activated carbon adsorber forms of connecting carry out heavy metal ion adsorbed form progress.Fluid injection drilling and institute
Stating production well arrangement form is seven point type of center position, and corner part is arranged using four point-type or determinant.Fluid injection drilling and
The quantity ratio of the production well is 1:2.75, further includes being arranged in the zone boundary for needing to carry out heavy metal pollution of soil processing
Inspection well totally 18.The distance between production well and fluid injection drilling are 20m, the production well and the setting of fluid injection bore inner
UPVC material casing.
Carbon dioxide enters fluid injection general pipeline after the metering of carbon dioxide stream meter, and fluid injection general pipeline leads in the central station of floating dock of well site
To different fluid injections drilling branch pipe, the oxygen after gasification is passed through fluid injection after oxygen flow meter measures for distribution after the control of overcurrent meter
Drilling branch pipe is configured into leachant and is passed through each fluid injection drilling；
The leaching solution flows through contaminated soil horizon for the Leaching of Heavy Metals in soil, and leachate is by immersible pump from dirty
Dye soil horizon drawing liquid branch pipe along production well is promoted to earth's surface；Leachate in each drawing liquid branch pipe summarizes into liquid collecting
Pond, the leachate in collecting tank by the second centrifugal pumping to the concatenated bag filter of second level different accuracy, by filter progress
Solid particulate matter therein is removed；Enter heavy metal recovery process by the leachate of filter progress, ion exchange tower uses 5
2 activated carbon adsorber form heavy-metal ion removals of series connection, activated carbon adsorber export adsorption tail liquid again after tower series connection
It returns and continues to prepare leachate with liquid pool reuse.
The amount of carbon dioxide wherein dissolved in leaching solution is 400mg/L, and remaining oxygen content is 30mg/L in the leachate.
Active carbon adsorption material preparation flow: agricultural stalk is ground into granularity to be modified and preparing active carbon suction by carbonization
Enclosure material, the absorbent charcoal material being prepared are applied to activated carbon adsorption described in the leachate heavy metal recovery process
Technique；
In above-mentioned technical proposal, the active carbon adsorption material preparation flow is that the agricultural stalk passes through pulverizer (19)
Crushing is length 10cm particle, and the particle is placed in alkali in 5wt%NaOH solution and soaks 72h, is then taken out in being washed with water to
Property, the particle after washing carries out the drying in drying machine (20), by the particle after drying in 0.5g/mL (NH4)2HPO436h, the particle and the (NH are impregnated in solution4)2HPO4Solution quality ratio is 1:5, and the particle is 120 after dipping
DEG C drying, again dry after the particle pre-oxidize 1h at 180 DEG C in air in carbide furnace (21), by of pre-oxidation
Grain is activated under 800 DEG C of nitrogen protections, and the rate of heat addition is controlled in 30 DEG C/min, activation time 60min.
In above-mentioned technical proposal, the carbon dioxide preparation flow is by adsorption saturation in the active carbon absorption technology
Active carbon mixes progress oxygen-enriched combusting to be blown into air in 1200kg/h investment combustion tower (23) with the first air blower (22), oxygen-enriched
The carbon dioxide gas that burning generates is sent into scrubbing tower (25) bottom by the second air blower (24) and removes impurity by water washing,
Carbon dioxide gas is obtained by washing, purifying, the carbon dioxide gas is sent to carbon dioxide stream meter (6) for preparing institute
State leachant.
The heavy metal recovery process further includes ion exchange resin elution desorption process and ion exchange resin regeneration work
Sequence.
The relational terms of such as " first " and " second " or the like have been used to be used merely in embodiment for ease of explanation,
One is distinguished with another component with same names, is existed without necessarily requiring or implying between these components
Any actual relationship or order.
Illustrative description has been done to utility model above, it should explanation, in the core for not departing from the utility model
In the case where, any simple deformation, modification or other skilled in the art can not spend being equal for creative work
Replacement each falls within the protection scope of the utility model.
Claims (10)
1. the device that a kind of green is recycled to soil pollution by heavy metal, which is characterized in that described device includes:
Heavy metal in soil leaching equipment: match liquid pool (1), the first centrifugal pump (2), well site central station of floating dock (3), carbon dioxide stream meter
(6), liquid oxygen basin (7), oxygen gasified device (8), oxygen flow meter (9), fluid injection drill (10), and production well (11) is dived
Water pump (12), collecting tank (13), filter (14), ion exchange tower (15), the second centrifugal pump (16) activated carbon adsorber (18)；
Wherein the outlet with liquid pool (1) is connected to the import of the first centrifugal pump (2) using pipeline, first centrifugal pump (2)
Outlet connection fluid injection general pipeline enters the well site central station of floating dock (3) and is divided into fluid injection drilling branch identical with the fluid injection hole number
Pipe, the fluid injection drilling branch pipe connect the fluid injection drilling (10), and the immersible pump (12) is arranged in the production well (11)
Bottom, the outlet of the immersible pump (12) is connected to the entrance of collecting tank (13), the outlet of the collecting tank (13) by pipeline
The entrance of the second centrifugal pump (16), the outlet of the second centrifugal pump (16) and the entrance of the filter (14) are connected to by pipeline
Pipeline is connected, and the outlet of said filtration device (14) is connected with the inlet duct of the ion exchange tower (15), the ion exchange
The outlet of tower (15) is connected with the activated carbon adsorber (18) inlet duct, and the activated carbon adsorber (18) matches liquid with described
The inlet duct in pond (1) is connected；
Active carbon adsorption material preparation facilities: pulverizer (19), drying machine (20), retort (21), the pulverizer (19) go out
Mouth is connected to the drying machine (20) entrance by conveying equipment, and drying machine (20) outlet is connected to institute by conveying equipment
State retort (21) entrance；
Carbon dioxide preparation facilities: the first air blower (22), combustion tower (23), the second air blower (24), scrubbing tower (25) are described
First air blower (22) outlet is connected to the combustion tower (23) gas phase entrance, combustion tower (23) gaseous phase outlet by pipeline
It is connected with the second air blower (24) inlet duct, the second air blower (24) outlet is connected to the washing by pipeline
The gas phase entrance of tower (25) lower part, scrubbing tower (25) the upper gaseous phase outlet are connected to the carbon dioxide flow by pipeline
It counts (6).
2. the apparatus according to claim 1, which is characterized in that flow indication is arranged on the every fluid injection drilling branch pipe
And UPVC material casing is arranged in adjustment equipment, the production well and fluid injection bore inner.
3. the apparatus according to claim 1, which is characterized in that the filter is bag filter, and filter process uses
The filter series connection of no less than two-stage difference filtering accuracy is filtered.
4. the apparatus according to claim 1, which is characterized in that the ion exchange tower cascade connection, the ion
Exchange column quantity is not less than 3.
5. the apparatus according to claim 1, which is characterized in that loaded particles shape amberlite in the ion exchange tower
Rouge, filling are highly the half of ion exchange tower direct tube section height to 2/3rds, are loaded in the activated carbon adsorber
Active carbon particle filling height is the half of activated carbon adsorber direct tube section height or more.
6. the apparatus according to claim 1, which is characterized in that the fluid injection drilling and the production well arrangement form can
Think four-point, five-point type, seven point types and/or determinant.
7. the apparatus according to claim 1, which is characterized in that the fluid injection drilling and the quantity ratio of the production well are
1:1~3, the distance between the production well and fluid injection drilling are 10~20m.
8. the apparatus according to claim 1, which is characterized in that the production well and fluid injection drilling depth be 30cm~
100cm。
9. the apparatus according to claim 1, which is characterized in that in addition in the area for needing to carry out heavy metal pollution of soil processing
Domain boundary is additionally provided with inspection well (17).
10. device according to claim 6, which is characterized in that the first air blower (22) power is 1~1.5KW, institute
Stating the second air blower (24) power is 6~7KW.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820226669.6U CN208288666U (en) | 2018-02-08 | 2018-02-08 | A kind of green is recycled to soil pollution by heavy metal device |
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|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125153A (en) * | 2018-02-08 | 2019-08-16 | 天津大学 | A kind of green is recycled to the method and device of soil pollution by heavy metal |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110125153A (en) * | 2018-02-08 | 2019-08-16 | 天津大学 | A kind of green is recycled to the method and device of soil pollution by heavy metal |
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