CN109365499A - A kind of subsurface system, its laying method and purposes - Google Patents
A kind of subsurface system, its laying method and purposes Download PDFInfo
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- CN109365499A CN109365499A CN201811258397.9A CN201811258397A CN109365499A CN 109365499 A CN109365499 A CN 109365499A CN 201811258397 A CN201811258397 A CN 201811258397A CN 109365499 A CN109365499 A CN 109365499A
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- drainpipe
- collector pipe
- soil
- pipe
- eluent
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention provides a kind of subsurface system, its laying method and purposes, the system comprises hidden pipes and sump, the hidden pipe includes drainpipe and collector pipe, and with square crossing or oblique circular array, the sump is set gradually along collector pipe direction for the drainpipe and collector pipe；The drainpipe is equipped with hole, not apertured on the collector pipe.The present invention is by the rational deployment of subsurface system, then is aided with suitable eluent, realizes the efficiently removal in situ of Heavy Metals in Contaminated Soils, can achieve 50~90% to the removal efficiency of the heavy metals such as lead, cadmium, zinc, the regulation effect of soil is good；The invention belongs to environmentally friendly processing modes, small to the destructiveness of soil, not will cause the reduction of soil fertility, suitable for administering the soil of all kinds of heavy metal pollutions, operating cost is lower, and economy is strong.
Description
Technical field
The invention belongs to remediation contaminated soil technical field, it is related to a kind of subsurface system, its laying method and purposes, especially
It is related to a kind of subsurface system, its laying method and the purposes for removing Heavy Metals in Contaminated Soils.
Background technique
The harmful substance that soil pollution refers to that mankind's activity generates enters soil, when its content is more than the self-cleaning of soil itself
Ability, and the phenomenon that so that the content of soil, property is morphed, reduce the yield and quality of crops, and be detrimental to health,
And heavy metal is one of most important soil pollutant, it is difficult to by natural degradation, the variation and migration of form can only occur.Generally
For, the main path of the reparation of heavy-metal contaminated soil includes: the existence for changing heavy metal, reduces its activity, makes it
Passivation is detached from food chain, reduces its toxicity；The heavy metal in soil is absorbed using special plant, then removes the plant；With
Heavy metal is become soluble state, free state by engineering technology, the heavy metal in leacheate is collected after scrubbed, to reach recycling
Heavy metal and the dual purpose for reducing heavy metal in soil.
Currently, the method for removing Heavy Metals in Contaminated Soils mainly includes soil moved in improve the original displacement method, electrodynamic repair method, plant
Repairing method, solvent extraction, soil washing and pyrolysis processing method etc..Wherein, electric repairing technique is complex, by soil
Environment is affected, and needs to expend high power supply expense；Pyrolytic technique is only applicable to the heavy metal of the high volatilities such as processing mercury,
But soil organic matter after pyrolysis can also be decomposed, and soil function is caused to lose, and not be suitable for farmland reparation；Research makes at present
It is that soil washing or soil washing are combined with other methods with more method comprising elution method in situ and dystopy leaching
Wash method.
104525556 A of CN discloses a kind of packaged type device and method of combined contamination soil elution, and the equipment is logical
The soil particle for different-grain diameter can will be sieved in a manner of wet screening to washed off soil by crossing multi-stage screening elution circuit, then
Different-grain diameter soil is cleaned into removal pollutant in soil with corresponded manner, but its Special attention will be given to different-grain diameter soil particle
Separation, and the elution of heavy metal is not specifically introduced.102909215 A of CN discloses a kind of chemical leaching and biology is repaired
Different types of contaminated soil is divided into severe dirt first by the method for complex phase combination restoration of soil polluted by heavy metal, this method
Soil and slight pollution soil are contaminated, then severe contaminated soil is eluted by adding acid chelating agent, extracts and is unearthed
The heavy metal of earth middle and high concentration carries out the polluted soil for eluting the incomplete remaining low concentration in part biological prosthetic.CN
107309266 A disclose a kind of ELUTION METHOD of Compound Heavy Metals serious pollution soil, by using iron chloride and citric acid
Compounding composition eluent, but this method needs for contaminated soil to be sieved, using dystopy elution method, required higher cost, and
Nutriment is easy to be lost in soil.In addition to this, existing many eluents easily cause secondary pollution, destroy soil physics,
Chemical composition causes soil fertility to reduce.
In conclusion the removal of Heavy Metals in Contaminated Soils also needs to explore, in situ, eluent is small to soil fail, at
The method that this is low, economy is strong.
Summary of the invention
In view of the problems of the existing technology, the purpose of the present invention is to provide subsurface system, its laying method and purposes,
The present invention selects suitable eluent by setting subsurface system, the removal in situ of Heavy Metals in Contaminated Soils is realized, to soil
The destructiveness of earth is small, and the eluting rate of heavy metal ion is high, and the regulation effect of soil is good, not will cause soil fertility reduction, and ring
Border is friendly, and economy is strong.
To achieve this purpose, the present invention adopts the following technical scheme:
In a first aspect, the present invention provides a kind of subsurface system, the system comprises hidden pipe and sump, the hidden pipe packet
Drainpipe and collector pipe are included, the drainpipe and collector pipe are with square crossing or oblique circular array, and the sump is along collection
Water pipe direction is set gradually；The drainpipe is equipped with hole, not apertured on the collector pipe.
In the present invention, in order to realize the removal in situ of heavy metal in soil, underground hidden pipe is laid in contaminated soil,
By using the form of drainpipe and collector pipe two-stage pipeline, soil is adequately covered, the weight that will be eluted
Metal exports in time, and sump is arranged along collector pipe direction, the collection in time of the solution containing heavy metal eluted is handled, is adopted
With this subsurface system, the efficient removal of heavy metal in soil may be implemented, operating cost is lower, and soil remediation effect is good.
In the present invention, the system is referred to as device, equipment or process units and its combination etc..
It is used as currently preferred technical solution below, but not as the limitation of technical solution provided by the invention, passes through
Following technical scheme can preferably reach and realize technical purpose and beneficial effect of the invention.
As currently preferred technical solution, the drainpipe and collector pipe include plastic tube.
Preferably, the drainpipe is band ripple hole plastic tube.
Preferably, the diameter of the drainpipe be 80~110mm, such as 80mm, 85mm, 90mm, 95mm, 100mm,
105mm or 110mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the hole on the drainpipe is oval.
Preferably, the drainpipe is coated with outsourcing material.
Preferably, the outsourcing material includes permeable non-woven fabrics.
In the present invention, hidden pipe is laid on underground, in order to prevent its removing for being corroded and influencing heavy metal, is typically chosen modeling
Expects pipe has ripple hole on drainpipe, other substances enter hidden pipe in soil in order to prevent, blocks water-filtering micropore, needs arranging
Water pipe outer cladding outsourcing material is typically chosen corrosion resistant permeable non-woven fabrics, wraps up 2~3 layers, is tied up with fine cordage or cotton rope,
Formation is assured in advance, plays the role of protecting hidden pipe.
Preferably, the diameter of the collector pipe is 150~200mm, such as 150mm, 160mm, 170mm, 180mm, 190mm
Or 200mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the angle of the drainpipe and collector pipe is 45~90 degree, such as 45 degree, 50 degree, 60 degree, 70 degree, 80
Degree or 90 degree etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable, when two
When person's angle is 90 degree, drainpipe and collector pipe vertical arrangement.
Preferably, the hidden pipe further includes main drainpipe.
Preferably, the main drainpipe is plastic tube not with holes.
Preferably, the diameter of the main drainpipe be 200~300mm, such as 200mm, 220mm, 240mm, 260mm,
280mm or 300mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
As currently preferred technical solution, multiple drainpipes are arranged in parallel, multiple collector pipe parallels
Column.
Preferably, the drainpipe is connected with collector pipe in infall.
Preferably, between adjacent row water pipe, the distance between adjacent collector pipe independently is 6~10m, such as 6m, 6.5m,
7m, 7.5m, 8m, 8.5m, 9m, 9.5m or 10m etc., it is not limited to cited numerical value, interior other of the numberical range are not arranged
The numerical value of act is equally applicable.
Preferably, the gradient along drainpipe direction and collector pipe direction independently be 1~8 ‰, such as 1 ‰, 2 ‰, 3 ‰,
4 ‰, 5 ‰, 6 ‰, 7 ‰ or 8 ‰ etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
Preferably, the downstream of multiple collector pipes is connected to main drainpipe, and the main drainpipe is connected with sewage
Processing unit.
In the present invention, the setting of main drainpipe is usually vertical with collector pipe, and the leacheate in collector pipe is pooled to main draining
Focused in pipe, sump can play the role of buffering at this time, be directly entered main drainpipe to avoid a large amount of leacheates and
Have little time to handle.
Preferably, the sewage-treatment plant includes membrane bioreactor integration apparatus.
Preferably, the spacing of adjacent sump is 80~100m, such as 80m, 85m, 90m, 95m or 100m etc., but not
It is only limitted to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
In the present invention, hole is had on drainpipe, the heavy metal into eluent is introduced into drainpipe, then flow to collector pipe,
Finally sewage-treatment plant is collected to through main drainpipe.For the flowing convenient for liquid in pipe, drainpipe, collector pipe and main draining
Pipe is provided with certain gradient, according to the additional amount of eluent and the size of sump, suitably adjusting its spacing, makes hidden pipe
The treatment effeciency of system reaches best.
As currently preferred technical solution, the system also includes inspection shaft, the inspection shaft is along collector pipe direction
It sets gradually.
Preferably, the spacing of adjacent inspection shaft is 20~30m, such as 20m, 22m, 24m, 26m, 28m or 30m etc., but simultaneously
It is not limited only to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
In the present invention, since the spacing of sump is larger, therefore the laying length of collector pipe can also reach relatively large distance, and be
Convenient for checking the water (flow) direction in hidden pipe and whether blocking, convenient for repairing in time, inspection shaft is set along collector pipe direction.
Second aspect, the present invention provides a kind of laying methods of above-mentioned subsurface system, which comprises
(1) filled solid particle after groove is dug in soil to be processed, forms first every drenching layer；
(2) in step (1) described first every the laying described in any item hidden pipes of claim 1-4 in drenching layer；
(3) solid particle is continued to fill up above step (2) described hidden pipe, forms second every drenching layer, then cover native soil,
Groove is filled and led up.
As currently preferred technical solution, the depth of step (1) described groove is 0.8~1.0m, such as 0.8m,
0.85m, 0.9m, 0.95m or 1.0m etc., it is not limited to cited numerical value, other interior unlisted numbers of the numberical range
It is worth equally applicable；Width is 0.4~0.6m, such as 0.4m, 0.45m, 0.5m, 0.55m or 0.6m etc., it is not limited to listed
The numerical value of act, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the spacing of step (1) described groove be 6~10m, such as 6m, 6.5m, 7m, 7.5m, 8m, 8.5m, 9m,
9.5m or 10m etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
Preferably, the shape of step (1) described groove is up-side down triangle or inverted trapezoidal.
In the present invention, groove is set as up-side down triangle or inverted trapezoidal, enters drainpipe after facilitating eluent to elute heavy metal
It excludes in time.
Preferably, the gradient of step (1) described groove is 1~8 ‰, such as 1 ‰, 2 ‰, 3 ‰, 4 ‰, 5 ‰, 6 ‰, 7 ‰
Or 8 ‰ etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
As currently preferred technical solution, step (1) and step (3) described solid particle independently be gravel and/
Or sandstone.
Preferably, step (1) and the average grain diameter of step (3) described solid particle independently are 5~10mm, such as 5mm,
6mm, 7mm, 8mm, 9mm or 10mm etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range
It is equally applicable.
Preferably, step (1) described first independently is 0.15 every the height of drenching layer every drenching layer and step (3) described second
~0.25m, such as 0.15m, 0.16m, 0.18m, 0.20m, 0.22m, 0.24m or 0.25m etc., it is not limited to cited
Numerical value, other interior unlisted numerical value of the numberical range are equally applicable.
In the present invention, " first " and " second " before drenching layer is not only to facilitate to difference to the limitation every drenching layer
The solid particle layer that stage is added distinguishes.Every the setting of drenching layer, it is possible to prevente effectively from soil directly contacts and attached with hidden pipe
On hidden pipe surface, be discharged after timely entering hidden pipe convenient for the leacheate containing heavy metal.
Preferably, step (2) described hidden pipe includes drainpipe, collector pipe and main drainpipe.
Preferably, the laying length of the collector pipe be 80~100m, such as 80m, 82m, 85m, 88m, 90m, 82m,
95m, 98m or 100m etc., it is not limited to cited numerical value, other interior unlisted numerical value of the numberical range are equally suitable
With.
In the present invention, the trench digging of hidden pipe, pipe laying and a series of activities such as embedded can be completed with manual operation, can also be adopted
It is completed with pipe-laying trencher mechanization.The gradient and depth of trench digging can be automatically controlled by laser control system, realize pipe laying gradient
Accurate control.
The third aspect, the present invention provides a kind of methods for removing Heavy Metals in Contaminated Soils, and the method is using above-mentioned
Subsurface system carries out.
As currently preferred technical solution, which comprises
(a) eluent is added on the contaminated soil for being equipped with the subsurface system, eluent and heavy metal ion are sent out
Raw reaction, obtains the leacheate containing heavy metal；
(b) leacheate containing heavy metal that step (1) obtains enters drainpipe, then sequentially flow to collector pipe, main drainpipe
After carry out sewage treatment.
As currently preferred technical solution, step (a) eluent includes biosurfactant and/or organic
Acid.
In the present invention, the selection of the eluent is needed to desorb heavy metal ion from soil particle, is transferred to
In liquid phase, to enter subsurface system with liquid phase eluent, achieve the effect that remove from soil.
Preferably, the biosurfactant includes any one in disodium ethylene diamine tetraacetate, rhamnolipid or saponin(e
Kind or at least two combination, the combination is typical but non-limiting example has: disodium ethylene diamine tetraacetate and rhamnolipid
Combination, the combination of rhamnolipid and saponin(e, disodium ethylene diamine tetraacetate, rhamnolipid and combination of saponin(e etc..
Preferably, the concentration of the biosurfactant be 0.02~0.5mol/L, such as 0.02mol/L,
0.04mol/L, 0.05mol/L, 0.1mol/L, 0.2mol/L, 0.3mol/L, 0.4mol/L or 0.5mol/L etc., but simultaneously not only
It is limited to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
Preferably, the organic acid includes any one in malic acid, citric acid, tartaric acid, acetic acid or ethylenediamine tetra-acetic acid
Kind or at least two combination, the combination is typical but non-limiting example has: the combination of malic acid and citric acid, citric acid with
The combination of tartaric acid, the combination of tartaric acid, acetic acid and ethylenediamine tetra-acetic acid, malic acid, tartaric acid and combination of acetic acid etc..
Preferably, the concentration of the organic acid be 0.005~0.5mol/L, such as 0.005mol/L, 0.01mol/L,
0.03mol/L, 0.05mol/L, 0.1mol/L, 0.2mol/L, 0.3mol/L, 0.4mol/L or 0.5mol/L etc., but simultaneously not only
It is limited to cited numerical value, other unlisted numerical value are equally applicable in the numberical range.
In the present invention, the reaction principle of eluent and heavy metal ion is: biosurfactant is by changing soil
Surface nature, the dissolubility or generation ion exchange of enhancing organic ligand in water, to promote heavy metal ion to turn from solid phase
Change to liquid phase；Small molecular organic acid can be used as chelating agent and form stable chelate in conjunction with heavy metal, make heavy metal from soil
Particle desorption is converted into soluble state by not solvent, improves elution efficiency；Moreover, eluent biosurfactant used and having
Machine acidity can be mild, and biological degradability is good, and there are no pollution to the environment.
Due to performances and soil with organic matter, oxide such as chemical form, solubility of the heavy metal in contaminated soil
The difference of equal counterweights metallochemistry adsorption capacity, identical eluent can not to the removal effect of different heavy metal ion yet
Together；And due to the difference of different eluent self properties, it also can be different to the elution effect of identical heavy metal ion.It is above-mentioned listed
In the biosurfactant of act, saponin(e is best to the removal effect of heavy metal, in cited organic acid, with tartaric acid or lemon
The effect of lemon acid is best.
Preferably, when the biosurfactant and organic acid are used in conjunction with, the molar ratio of the two is (0.5~3): 1,
Such as 0.5:1,1:1,1.5:1,2:1,2.5:1 or 3:1 etc., it is not limited to cited numerical value, in the numberical range its
His unlisted numerical value is equally applicable.
In the present invention, when biosurfactant and organic acid compound, the molar ratio of the two will affect the elution of heavy metal
The concentration bring of effect, especially organic acid influences, and biosurfactant compounds in washed off soil with low-concentration organic acid
Heavy metal when, the two plays the role of mutually promoting, and when organic acid concentration is higher, can generate antagonism instead, reason
May be: the increase of organic acid concentration, the micella formed in solution have fettered the organic acid molecule in medium, while biological surface
The hydrophilic group of activating agent is combined with hydrophilic soil particle, makes the difficulty soluble salts such as the calcium carbonate in soil and residual heavy metal
It is difficult to dissociate.
Preferably, the adding manner of the eluent is spray.
Preferably, the additional amount of the eluent be 40~80 ton/mu soil, such as 40 tons/mu, 45 tons/mu, 50 tons/
Mu, 55 tons/mu, 60 tons/mu, 65 tons/mu, 70 tons/mu, 75 tons/mu or 80 tons/mu etc., it is not limited to cited number
Value, other interior unlisted numerical value of the numberical range are equally applicable.
As currently preferred technical solution, step (b) leacheate enters sewage-treatment plant from main drainpipe
It is handled.
Preferably, the sewage-treatment plant includes membrane bioreactor integration apparatus.
Preferably, it is recycled after the leacheate processing for field irrigation and/or configuration eluent.
Compared with prior art, the invention has the following advantages:
(1) subsurface system of the present invention is rationally distributed, and by selecting suitable eluent, contaminated soil may be implemented
The removal in situ of middle heavy metal, it is high to the removal efficiency of the heavy metals such as lead, cadmium and zinc, it can achieve 50~90%, soil
Regulation effect is good；
(2) method of present invention removal heavy metal in soil is small to the destructiveness of soil, not will cause the drop of soil fertility
It is low, meanwhile, operating cost is lower, and economy is strong.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of subsurface system described in the embodiment of the present invention 1；
Fig. 2 is the structural schematic diagram of subsurface system described in the embodiment of the present invention 2；
Wherein, 1- drainpipe, 2- collector pipe, 3- main drainpipe, 4- concentrate well, 5- inspection shaft, 6- sewage-treatment plant.
Specific embodiment
In order to better illustrate the present invention, it is easy to understand technical solution of the present invention, below to the present invention with specific embodiment party
Formula is further described.But following embodiments is only simple example of the invention, does not represent or limits and is of the invention
Rights protection scope, the scope of the present invention are subject to claims.
The following are typical but non-limiting embodiments of the invention:
Embodiment 1:
Present embodiments provide a kind of subsurface system and its laying method, the structural schematic diagram of the system as shown in Figure 1,
Including hidden pipe and sump 4, the hidden pipe includes drainpipe 1 and collector pipe 2, and the drainpipe 1 and collector pipe 2 are with square crossing
Form arrangement, the sump 4 sets gradually along 2 direction of collector pipe；The drainpipe 1 is equipped with hole, on the collector pipe 2
Not apertured.
Wherein, the drainpipe 1 is band ripple hole plastic tube, and a diameter of 100mm, the collector pipe 2 is modeling not with holes
Expects pipe, a diameter of 180mm；The drainpipe 1 is coated with permeable non-woven fabrics.
Multiple drainpipes 1 are arranged in parallel, and the spacing of adjacent row water pipe 1 is 6m, multiple 2 parallels of collector pipe
Column, the spacing of adjacent collector pipe 2 is also 6m, and the gradient along 2 direction of 1 direction of drainpipe and collector pipe is 4 ‰；Adjacent sump
4 spacing is 100m.
The hidden pipe further includes main drainpipe 3, and the main drainpipe 3 is plastic tube not with holes, a diameter of 250mm；
The downstream of multiple collector pipes 2 is connected to main drainpipe 3, and the main drainpipe 3 is connected with sewage-treatment plant 6, institute
Stating sewage-treatment plant 6 is membrane bioreactor integration apparatus.
The system also includes inspection shaft 5, the inspection shaft 5 is set gradually along 2 direction of collector pipe, adjacent inspection shaft 5
Spacing is 30m.
The laying method of the subsurface system includes:
(1) spacing in soil to be processed according to 6m wide digs the up-side down triangle groove of deep 0.8m, width 0.5m, then fills out
The gravel that average grain diameter is 5mm is filled, forms height as the first of 0.2m every drenching layer；
(2) in step (1) respective groove first every being laid with drainpipe 1, collector pipe 2 and main drainpipe 3 in drenching layer respectively,
The laying length of collector pipe 2 is 100m, and 1 length of drainpipe is the distance between adjacent collector pipe 2；
(3) gravel that average grain diameter is 5mm is continued to fill up in the groove after step (2) are laid with hidden pipe, forming height is
The second of 0.2m is every drenching layer, then covers native soil, and groove is filled and led up.
Embodiment 2:
Present embodiments provide a kind of subsurface system and its laying method, the structural schematic diagram of the system as shown in Fig. 2,
Including hidden pipe and sump 4, the hidden pipe includes drainpipe 1 and collector pipe 2, and the drainpipe 1 and collector pipe 2 are with oblique herringbone
Shape arrangement, the angle of the two is 60 degree, and the sump 4 is set gradually along 2 direction of collector pipe；The drainpipe 1 is equipped with hole,
Not apertured on the collector pipe 2.
Wherein, the drainpipe 1 is band ripple hole plastic tube, and a diameter of 80mm, the collector pipe 2 is not perforated plastic
Pipe, a diameter of 150mm；The drainpipe 1 is coated with permeable non-woven fabrics.
Multiple drainpipes 1 are arranged in parallel, and the spacing of adjacent row water pipe 1 is 8m, multiple 2 parallels of collector pipe
Column, the spacing of adjacent collector pipe 2 is also 8m, and the gradient along 2 direction of 1 direction of drainpipe and collector pipe is 1 ‰；Adjacent sump
4 spacing is 90m.
The hidden pipe further includes main drainpipe 3, and the main drainpipe 3 is plastic tube not with holes, a diameter of 200mm；
The downstream of multiple collector pipes 2 is connected to main drainpipe 3, and the main drainpipe 3 is connected with sewage-treatment plant 6, institute
Stating sewage-treatment plant 6 is membrane bioreactor integration apparatus.
The system also includes inspection shaft 5, the inspection shaft 5 is set gradually along 2 direction of collector pipe, adjacent inspection shaft 5
Spacing is 25m.
The laying method of the subsurface system includes:
(1) spacing in soil to be processed according to 8m wide digs the up-side down triangle groove of deep 0.9m, width 0.4m, then fills out
The sandstone that average grain diameter is 8mm is filled, forms height as the first of 0.15m every drenching layer；
(2) in step (1) respective groove first every being laid with drainpipe 1, collector pipe 2 and main drainpipe 3 in drenching layer respectively,
The laying length of collector pipe 2 is 90m, and 1 length of drainpipe is the distance between adjacent collector pipe 2；
(3) sandstone that average grain diameter is 7mm is continued to fill up in the groove after step (2) are laid with hidden pipe, forming height is
The second of 0.25m is every drenching layer, then covers native soil, and groove is filled and led up.
Embodiment 3:
A kind of subsurface system and its laying method are present embodiments provided, it is described the system comprises hidden pipe and sump 4
Hidden pipe includes drainpipe 1 and collector pipe 2, and the drainpipe 1 and collector pipe 2 are arranged in the form of square crossing, the sump 4
It is set gradually along 2 direction of collector pipe；The drainpipe 1 is equipped with hole, not apertured on the collector pipe 2.
Wherein, the drainpipe 1 is band ripple hole plastic tube, and a diameter of 110mm, the collector pipe 2 is modeling not with holes
Expects pipe, a diameter of 200mm；The drainpipe 1 is coated with permeable non-woven fabrics.
Multiple drainpipes 1 are arranged in parallel, and the spacing of adjacent row water pipe 1 is 10m, multiple 2 parallels of collector pipe
Column, the spacing of adjacent collector pipe 2 is also 10m, and the gradient along 2 direction of 1 direction of drainpipe and collector pipe is 8 ‰；It is adjacent to catchment
The spacing of well 4 is 80m.
The hidden pipe further includes main drainpipe 3, and the main drainpipe 3 is plastic tube not with holes, a diameter of 300mm；
The downstream of multiple collector pipes 2 is connected to main drainpipe 3, and the main drainpipe 3 is connected with sewage-treatment plant 6, institute
Stating sewage-treatment plant 6 is membrane bioreactor integration apparatus.
The system also includes inspection shaft 5, the inspection shaft 5 is set gradually along 2 direction of collector pipe, adjacent inspection shaft 5
Spacing is 20m.
The laying method of the subsurface system includes:
(1) spacing in soil to be processed according to 10m wide digs the inverted trapezoidal of deep 1.0m, upper width 0.6m, lower width 0.2m
Groove is subsequently filled the gravel that average grain diameter is 10mm, forms height as the first of 0.25m every drenching layer；
(2) in step (1) respective groove first every being laid with drainpipe 1, collector pipe 2 and main drainpipe 3 in drenching layer respectively,
The laying length of collector pipe 2 is 80m, and 1 length of drainpipe is the distance between adjacent collector pipe 2；
(3) sandstone that average grain diameter is 10mm is continued to fill up in the groove after step (2) are laid with hidden pipe, forming height is
The second of 0.25m is every drenching layer, then covers native soil, and groove is filled and led up.
In embodiment 1-3, by being laid with subsurface system in contaminated soil, the hidden pipe is rationally distributed, and drainpipe catchments
Pipe and main drainpipe multistage pipeline combine, then pass through the setting of sump and inspection shaft, so that the leaching after elution heavy metal
Washing lotion can be focused on quickly, be also convenient for overhauling hidden pipe in time；The subsurface system is small to the destructiveness of soil, can
Suitable for administering the soil of all kinds of heavy metal pollutions.
Embodiment 4:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 1 institute of embodiment
It is carried out in the subsurface system stated, comprising the following steps:
(a) eluent is sprayed to being equipped on the contaminated soil of subsurface system described in embodiment 1, the eluent uses
Concentration is the rhamnolipid of 0.1mol/L, and additional amount is 40 ton/mu soil, and eluent reacts with heavy metal ion, obtains
Leacheate containing heavy metal；
(b) leacheate containing heavy metal that step (1) obtains enters drainpipe 1, then sequentially flow to collector pipe 2, main draining
After pipe 3, sewage treatment is carried out using membrane bioreactor integration apparatus, treated, and leacheate is used for field irrigation.
In the present embodiment, on the basis of subsurface system, the heavy metal ion in suitable eluent elution soil, institute are selected
Pollution-free to soil with eluent, the eluting rate that the eluting rate of heavy metal Cd can achieve 73%, Pd and Zn also can reach
60% or more.
Embodiment 5:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 2 institute of embodiment
It states in subsurface system and carries out, comprising the following steps:
(a) eluent is sprayed to being equipped on the contaminated soil of subsurface system described in embodiment 2, the eluent uses
Concentration is the tartaric acid of 0.3mol/L, and additional amount is 60 ton/mu soil, and eluent reacts with heavy metal ion, contained
The leacheate of heavy metal；
(b) leacheate containing heavy metal that step (1) obtains enters drainpipe 1, then sequentially flow to collector pipe 2, main draining
After pipe 3, sewage treatment is carried out using membrane bioreactor integration apparatus, treated, and leacheate is configured to eluent again follows
Ring uses.
In the present embodiment, on the basis of subsurface system, the heavy metal ion in suitable eluent elution soil, institute are selected
Pollution-free to soil with eluent, the eluting rate that the eluting rate of heavy metal Cd can achieve 86%, Pb and Zn also can reach
56% or more.
Embodiment 6:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 3 institute of embodiment
It states in subsurface system and carries out, comprising the following steps:
(a) eluent is sprayed to being equipped on the contaminated soil of subsurface system described in embodiment 3, the eluent uses
Saponin(e and citric acid, wherein saponin concentrations are 0.2mol/L, and citric acid concentration 0.075mol/L, additional amount is 80 ton/mu soil
Earth, eluent react with heavy metal ion, obtain the leacheate containing heavy metal；
(b) leacheate containing heavy metal that step (1) obtains enters drainpipe 1, then sequentially flow to collector pipe 2, main draining
After pipe 3, sewage treatment is carried out using membrane bioreactor integration apparatus, treated, and leacheate is configured to eluent again follows
Ring uses.
In the present embodiment, on the basis of subsurface system, biosurfactant and the eluent of organic acid compounding is selected to wash
Heavy metal ion in de- soil, eluent used is pollution-free to soil, the eluting rate of heavy metal Cd can achieve 92%, Pb and
The eluting rate of Zn also can reach 68% or more.
Embodiment 7:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 1 institute of embodiment
State in subsurface system and carry out, referring to embodiment 4, difference is only that the method: eluent used is disodium ethylene diamine tetraacetate
And saponin(e, wherein the concentration of disodium ethylene diamine tetraacetate is 0.02mol/L, and the concentration of saponin(e is 0.5mol/L.
In the present embodiment, the use of eluent used is pollution-free to soil, the eluting rate of heavy metal Cd reach 85%, Pb and
The eluting rate of Zn reaches 60% or more.
Embodiment 8:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 1 institute of embodiment
State in subsurface system and carry out, referring to embodiment 4, difference is only that the method: eluent used is citric acid and ethylenediamine tetraacetic
Acetic acid, wherein the concentration of citric acid is 0.5mol/L, and the concentration of ethylenediamine tetra-acetic acid is 0.05mol/L.
In the present embodiment, the use of eluent used is pollution-free to soil, the eluting rate of heavy metal Cd reach 88%, Pb and
The eluting rate of Zn reaches 60% or more.
Embodiment 9:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 3 institute of embodiment
It states in subsurface system and carries out, referring to embodiment 6, difference is only that the method: the eluent uses rhamnolipid and apple
Acid, wherein rhamnolipid concentration is 0.05mol/L, malic acid concentration 0.1mol/L.
In the present embodiment, the same eluent for selecting biosurfactant and organic acid compounding, weight pollution-free to soil
The eluting rate of metal Cd reaches 86%, Pb and the eluting rate of Zn reaches 60% or more.
Embodiment 10:
A kind of ELUTION METHOD for removing Heavy Metals in Contaminated Soils is present embodiments provided, the method is in 3 institute of embodiment
It states in subsurface system and carries out, referring to embodiment 6, difference is only that the method: the eluent uses saponin(e and malic acid,
Middle saponin concentrations are 0.15mol/L, malic acid concentration 0.4mol/L.
In the present embodiment, since the concentration of organic acid used is higher, surfactant and have when heavy metal in washed off soil
Antagonism is generated between machine acid, is unfavorable for the removal of heavy metal instead, compared with Example 6, the eluting rate of heavy metal Cd is only
Eluting rate for 72%, Pb and Zn is 50% or so.
Based on the above embodiments as can be seen that the present invention is by the rational deployment of subsurface system, then it is aided with suitable elution
Agent realizes the efficiently removal in situ of Heavy Metals in Contaminated Soils, can achieve 50 to the removal efficiency of the heavy metals such as lead, cadmium, zinc
~90%, the regulation effect of soil is good；The system and method that the present invention removes heavy metal in soil is small to the destructiveness of soil, no
It will cause the reduction of soil fertility, meanwhile, operating cost is lower, and economy is strong.
The Applicant declares that the present invention is explained by the above embodiments detailed system and method for the invention, but the present invention
It is not limited to above-mentioned detailed system and method, that is, does not mean that the present invention must rely on above-mentioned detailed system and method could be real
It applies.It should be clear to those skilled in the art, any improvement in the present invention, replaces to the equivalent of present system component
It changes and the addition of accessory, the selection of concrete mode etc., all of which fall within the scope of protection and disclosure of the present invention.
Claims (10)
1. a kind of subsurface system, which is characterized in that the system comprises hidden pipe and sump, the hidden pipe includes drainpipe sum aggregate
Water pipe, the drainpipe and collector pipe with square crossing or oblique circular array, the sump along collector pipe direction successively
Setting；The drainpipe is equipped with hole, not apertured on the collector pipe.
2. subsurface system according to claim 1, which is characterized in that the drainpipe and collector pipe include plastic tube；
Preferably, the drainpipe is band ripple hole plastic tube；
Preferably, the diameter of the drainpipe is 80~110mm；
Preferably, the hole on the drainpipe is oval；
Preferably, the drainpipe is coated with outsourcing material；
Preferably, the outsourcing material includes permeable non-woven fabrics；
Preferably, the diameter of the collector pipe is 150~200mm；
Preferably, the angle of the drainpipe and collector pipe is 45~90 degree；
Preferably, the hidden pipe further includes main drainpipe；
Preferably, the main drainpipe is plastic tube not with holes；
Preferably, the diameter of the main drainpipe is 200~300mm.
3. subsurface system according to claim 1 or 2, which is characterized in that multiple drainpipes are arranged in parallel, Duo Gesuo
It is arranged in parallel to state collector pipe；
Preferably, the drainpipe is connected with collector pipe in infall；
Preferably, between adjacent row water pipe, the distance between adjacent collector pipe independently is 6~10m；
Preferably, the gradient along drainpipe direction and collector pipe direction independently is 1~8 ‰；
Preferably, the downstream of multiple collector pipes is connected to main drainpipe, and the main drainpipe is connected with sewage treatment
Device；
Preferably, the sewage-treatment plant includes membrane bioreactor integration apparatus；
Preferably, the spacing of adjacent sump is 80~100m.
4. subsurface system according to claim 1-3, which is characterized in that the system also includes inspection shaft, institutes
Inspection shaft is stated to set gradually along collector pipe direction；
Preferably, the spacing of adjacent inspection shaft is 20~30m.
5. the laying method of any one of -4 subsurface systems according to claim 1, which is characterized in that the described method includes:
(1) filled solid particle after groove is dug in soil to be processed, forms first every drenching layer；
(2) in step (1) described first every the laying described in any item hidden pipes of claim 1-4 in drenching layer；
(3) solid particle is continued to fill up above step (2) described hidden pipe, second is formed every drenching layer, then cover native soil, by ditch
Slot is filled and led up.
6. laying method according to claim 5, which is characterized in that the depth of step (1) described groove be 0.8~
1.0m, width are 0.4~0.6m；
Preferably, the spacing of step (1) described groove is 6~10m；
Preferably, the shape of step (1) described groove is up-side down triangle or inverted trapezoidal；
Preferably, the gradient of step (1) described groove is 1~8 ‰；
Preferably, step (1) and step (3) described solid particle independently are gravel and/or sandstone；
Preferably, step (1) and the average grain diameter of step (3) described solid particle independently are 5~10mm；
Preferably, step (1) described first every drenching layer and step (3) described second independently be 0.15 every the height of drenching layer~
0.25m；
Preferably, step (2) described hidden pipe includes drainpipe, collector pipe and main drainpipe；
Preferably, the laying length of the collector pipe is 80~100m.
7. a kind of method for removing Heavy Metals in Contaminated Soils, which is characterized in that the method is using any one of claim 1-4
The subsurface system carries out.
8. the method according to the description of claim 7 is characterized in that the described method includes:
(a) eluent is added on the contaminated soil for being equipped with the subsurface system, eluent and heavy metal ion occur instead
It answers, obtains the leacheate containing heavy metal；
(b) leacheate containing heavy metal that step (1) obtains enters drainpipe, then sequentially to flow to collector pipe, main drainpipe laggard
Row sewage treatment.
9. according to the method described in claim 8, it is characterized in that, step (a) eluent includes biosurfactant
And/or organic acid；
Preferably, the biosurfactant include any one in disodium ethylene diamine tetraacetate, rhamnolipid or saponin(e or
At least two combination；
Preferably, the concentration of the biosurfactant is 0.02~0.5mol/L；
Preferably, the organic acid include any one in malic acid, citric acid, tartaric acid, acetic acid or ethylenediamine tetra-acetic acid or
At least two combination；
Preferably, the concentration of the organic acid is 0.005~0.5mol/L；
Preferably, when the biosurfactant and organic acid are used in conjunction with, the molar ratio of the two is (0.5~3): 1；
Preferably, the adding manner of the eluent is spray；
Preferably, the additional amount of the eluent is 40~80 ton/mu soil.
10. method according to claim 8 or claim 9, which is characterized in that step (b) leacheate enters from main drainpipe
Sewage-treatment plant is handled；
Preferably, the sewage-treatment plant includes membrane bioreactor integration apparatus；
Preferably, it is recycled after the leacheate processing for field irrigation and/or configuration eluent.
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| CN201811258397.9A CN109365499A (en) | 2018-10-26 | 2018-10-26 | A kind of subsurface system, its laying method and purposes |
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| CN201811258397.9A CN109365499A (en) | 2018-10-26 | 2018-10-26 | A kind of subsurface system, its laying method and purposes |
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Cited By (4)
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| CN110355194A (en) * | 2019-08-29 | 2019-10-22 | 广东佳德环保科技有限公司 | A kind of heavy-metal contaminated soil elution repair system and method |
| CN112122324A (en) * | 2020-09-14 | 2020-12-25 | 湖南绿楷节能环保科技有限公司 | Bidirectional remediation method for heavy metal ion contaminated soil |
| CN113755177A (en) * | 2021-11-09 | 2021-12-07 | 锐创环境科技(天津)有限公司 | Soil conditioner for fly ash treatment and use method thereof |
| CN113770166A (en) * | 2021-09-28 | 2021-12-10 | 中国科学院遗传与发育生物学研究所农业资源研究中心 | Chemical leaching remediation method for heavy metal contaminated soil |
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