CN105750318A - Device and method for removing heavy metals in soil - Google Patents
Device and method for removing heavy metals in soil Download PDFInfo
- Publication number
- CN105750318A CN105750318A CN201610292164.5A CN201610292164A CN105750318A CN 105750318 A CN105750318 A CN 105750318A CN 201610292164 A CN201610292164 A CN 201610292164A CN 105750318 A CN105750318 A CN 105750318A
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- China
- Prior art keywords
- soil
- heavy metal
- capillary
- leacheate
- drainage band
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
Abstract
The invention discloses a device for removing heavy metals in soil. The device comprises a capillary through drainage belt buried at the bottom of a contaminated soil layer, a water collecting pipe which is communicated with the capillary through drainage belt, a heavy metal adsorption device connected with the outlet of the water collecting pipe, and a peristaltic pump connected with the water outlet of the heavy metal adsorption device, wherein the peristaltic pump is used for sending eluents back to the contaminated soil layer through a water inlet pipe, the capillary through drainage belt is provided with multiple capillary aqueducts which are arranged at intervals and have big insides and small outsides, and the capillary aqueducts are communicated with the water collecting pipe. A method for removing the heavy metals in the soil comprises the following steps: arranging the capillary through drainage belt at the bottom of heavy metal contaminated soil, rapidly discharging the eluents by the capillary through drainage belt, then discharging water of the eluents containing the heavy metals and reusing in the soil after being subjected to adsorption treatment, leaching the soil again, repeating and recycling for several times and then discharging the eluents. The device and the method for removing the heavy metals in the soil realize rapid separation of the eluents and the soil, improve the removal efficiency of the heavy metals and have a high drainage rate, high efficiency and low probability of blockage.
Description
Technical field
The present invention relates to field of environment protection, specifically a kind of device and method removing heavy metal in soil.
Background technology
In recent years, along with economic develops rapidly, the increasing soil of China is subject to heavy metal pollution.According to statistics, the arable land of current China existing more than 12% is subject to serious heavy metal pollution, and the life and health of the people is caused serious threat.Thus, need badly and the soil by heavy metal pollution is repaired and administered.Chemical leaching method is a kind of efficient heavy-metal contaminated soil restorative procedure.This method utilizes chemical leaching liquid that the heavy metal being adsorbed in solid phase of soil is transferred in leacheate, then the leacheate rich in heavy metal is recycled further, thus realizing the purpose of rehabilitating soil.The mass transport process that challenge is how strengthening leacheate and soil of this method and how effectively to carry out separating of leacheate and soil.Relatively frequently with original position elution method cross contaminated soil by leacheate at the flows by action of gravity or external force, and adopt the conventional discharge method such as recovery well or ditching collect and remove leacheate.For original position drip washing, the mixing of leacheate and soil is also insufficient, and conventional discharge method drainage rates is slow, easy silting, often cannot effectively discharge leacheate.
Summary of the invention
For existing original position elution technique Problems existing, the present invention provides a kind of device and method removing heavy metal in soil, capillary penetrating drainage band is coupled by it with chemical leaching method, utilizes capillary penetrating drainage band to discharge leacheate efficiently, it is achieved the sharp separation of leacheate and soil；Simultaneously, the leacheate of discharge is back to again in soil after treatment, soil is carried out drip washing again, thus forming the elution circuit of a set of closed cycle, to strengthen the mass transport process of soil and leacheate, promoting original position elution technique and remove the effect of heavy metal, leacheate is repeatedly discharged by such iterative cycles afterwards.
A kind of device removing heavy metal in soil, the peristaltic pump that the heavy metal adsorption device that the collector pipe connected with capillary penetrating drainage band including the capillary penetrating drainage band being embedded in bottom contaminated soil layer is connected with the outlet of collector pipe is connected with the outlet of heavy metal adsorption device, peristaltic pump is for being transmitted back in contaminated soil layer by water inlet pipe by leacheate, capillary penetrating drainage band is provided with multiple spaced interior big outer little capillary aqueduct, and capillary aqueduct connects with collector pipe.
Further, described capillary penetrating drainage band is the flat belt-like structure being made up of flexible material.
Further, capillary penetrating drainage band is spaced in the width direction and extends in length direction and be provided with multiple osculum, each osculum vertically extends to form downwards the groove running through capillary penetrating drainage band end face, the width of groove forms described capillary aqueduct less than the diameter of osculum, osculum and groove.
Further, capillary penetrating drainage band offers, every 1.5mm, the osculum that diameter is 1mm, and every osculum longitudinally cuts the wide groove of 0.3mm again open.
Further, the longitudinally spaced mounting groove offered for grafting capillary penetrating drainage band on collector pipe, capillary penetrating drainage band tilts to insert in mounting groove.
Further, capillary penetrating drainage band 2 is 1～90 ° with the angle of mounting groove.
Further, heavy metal adsorption device is heavy metal adsorption post, wherein equipped with the macromolecule polymer material of Adsorption of Heavy Metals or natural minerals.
Further, described macromolecule polymer material is the one in shell element, cellulose, chitosan or its mixing, and described natural minerals is the one in zeolite, kieselguhr or its mixing
A kind of method removing heavy metal in soil, adopts said apparatus to carry out, said method comprising the steps of:
A capillary penetrating drainage band and coupled collector pipe are laid in the bottom of contaminated soil layer by (), when burying underground, the notch of groove is downward；
B leacheate is added contaminated soil layer by (), and by leacheate with mixing with soil to carry out drip washing, the leacheate after eluting heavy metal rapidly enters in collector pipe under the effect of capillary penetrating drainage band, thus being discharged soil；
C () leacheate containing heavy metal enters in heavy metal adsorption device and carries out adsorption treatment, the leacheate after purification is again back in soil under the effect of peristaltic pump, and soil is carried out drip washing again；
D leacheate is repeatedly discharged by () so iterative cycles afterwards.
Further, described leacheate is prepared by the conventional eluent of chemical leaching method, including: organic acid, mineral acid, alkali, chelating agen or surfactant.
The invention have the benefit that capillary penetrating drainage band is laid in the bottom by heavy-metal contaminated soil by the present invention, capillary penetrating drainage band is utilized quickly to discharge leacheate, then the leacheate water outlet containing heavy metal is back in soil after adsorption treatment, soil is carried out drip washing again, leacheate is repeatedly discharged by such iterative cycles afterwards, leacheate is in continuous flow regime in this process, mixing with soil is comparatively abundant, enhance the mass transport process of soil and leacheate, improve heavy metals removal effect；Additionally, the drainage rates of this technique is fast, efficiency is high, and is not easily blocked.
Accompanying drawing explanation
Fig. 1 is the principle schematic that the present invention removes the method for heavy metal in soil；
Fig. 2 is the sectional view of capillary penetrating drainage band in the present invention.
In figure: 1 contaminated soil layer, 2 capillary penetrating drainage bands, 3 collector pipes, 4 leacheates, 5 outlet pipes, 6 heavy metal adsorption devices, 7 peristaltic pumps, 21 osculums, 22 grooves.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is clearly and completely described.
Refer to Fig. 1, the present invention removes the device of heavy metal in soil and includes being embedded in the peristaltic pump 7 that the heavy metal adsorption device 6 that the collector pipe 3 that the capillary penetrating drainage band 2 bottom contaminated soil layer 1 connects with capillary penetrating drainage band 2 is connected with the outlet of collector pipe 3 is connected with the outlet of heavy metal adsorption device 6, and peristaltic pump 7 is for being transmitted back to leacheate 4 in contaminated soil layer 1 by water inlet pipe.The outlet of collector pipe 3 is connected by the water inlet of outlet pipe 5 with heavy metal adsorption device 6.
Described capillary penetrating drainage band 2 be in civil engineering relatively frequently with commercial capillary penetrating drainage band, flexible material (such as flexible plastic) make flat belt-like structure, its width can be 100～200mm, and thickness can be 1.5～2.5mm.Please further refer to Fig. 2, capillary penetrating drainage band 2 being spaced in the width direction and extension is provided with multiple osculum 21 in length direction, each osculum 21 vertically extends to form the groove 22 running through capillary penetrating drainage band 2 end face downwards.The width of groove 22 is less than the diameter of osculum 21, and namely osculum 21 and groove 22 form interior big outer little capillary aqueduct structure.As shown in Figure 1, capillary penetrating drainage band 2 offers, every 1.5mm, the osculum 21 that diameter is 1mm, every osculum 21 longitudinally cuts groove 22 wide for 0.3mm open again, and the notch of groove 22 is downward when burying underground, oarse-grained soil will not enter from groove 22, and the leacheate permeated from soil then can pass through groove 22 and suck.
Groove 22 is as utilizing the capillarity water entering section to be sucked by the leacheate 4 in contaminated soil layer 1, and osculum 21 is as being used for collecting the leacheate 4 of groove 22 entrance and catchmenting and Drainage Division of being discharged by leacheate 4.Capillarity by the moisture ordered about in soil from lower to upper automatically in osculum thus realize soil, water separate.Additionally, due to capillary effect, current will form moisture film on groove 22, thus stoping leaking outside of current.
Described collector pipe 3 is the conventional corrugated tube of industry or pvc pipe.The longitudinally spaced mounting groove offered for grafting capillary penetrating drainage band 2 on collector pipe 3, capillary penetrating drainage band 2 tilts to insert in (angle is: 1～90 °) in mounting groove, and the two adopts glass cement or watertight transparent adhesive plaster to bond.Capillary penetrating drainage band 2 is installed along collector pipe 3 longitudinal separation.Capillary penetrating drainage band 2 tilts at an angle to be located on collector pipe 3, and capillary penetrating drainage band 2 two ends can be made to have certain drop, and when current fill the capillary aqueduct of drainage belt, current will flow to the outlet drain of capillary aqueduct under gravity.When current arrive outlet spilling, the siphonage produced because of drop will produce negative pressure further, constantly be aspirated by the leacheate entering capillary aqueduct, thus drainage rates is significantly increased.Compared with traditional drain pipe drainage, capillary penetrating drainage band has higher drainage efficiency, and is not easily blocked.
Described leacheate 4 is prepared by the conventional eluent of chemical leaching method, including: organic acid (such as citric acid), mineral acid (example hydrochloric acid), alkali (such as sodium hydroxide), chelating agen, surfactant (such as EDTA) etc..
Described heavy metal adsorption device 6 can be heavy metal adsorption post, wherein equipped with the customary filler of Adsorption of Heavy Metals, including: macromolecule polymer material (such as chitin, cellulose, chitosan), natural minerals (such as zeolite, kieselguhr).
The present invention removes the work process of the device of heavy metal in soil:
Leacheate 4 is added by the soil 1 of heavy metal pollution, and by leacheate 4 with mixing with soil to carry out drip washing, heavy metal will from soil release to leacheate 4.Owing to capillary penetrating drainage band 2 is connected with collector pipe 3, leacheate 4 will rapidly enter in collector pipe 3 under the effect of capillary penetrating drainage band 2, and then be discharged soil.After leacheate containing heavy metal enters heavy metal adsorption device 6 by outlet pipe 5, the heavy metal in leacheate is by filled absorption, so that leacheate is purified.Leacheate after purification is again back in soil under the effect of peristaltic pump 8, and soil is carried out drip washing again.In the continuous cyclic process of leacheate, the mass transfer between soil and leacheate obtains strengthening, and the heavy metal ion in soil constantly migrates in leacheate.Leacheate is repeatedly discharged by such iterative cycles afterwards, can realize the efficient removal to heavy metal in soil ion.
The present invention also provides for the method that heavy metal in soil is removed in a kind of capillary penetrating drainage band-chemical leaching coupling, and its application said apparatus carries out, and comprises the following steps:
A capillary penetrating drainage band 2 and coupled collector pipe 3 are laid in the bottom of contaminated soil layer 1 by (), when burying underground, the notch of groove 22 is downward；
B leacheate 4 is added contaminated soil layer 1 by (), and by leacheate 4 with mixing with soil to carry out drip washing, the leacheate after eluting heavy metal rapidly enters in collector pipe 3 under the effect of capillary penetrating drainage band 2, thus being discharged soil；
C () leacheate containing heavy metal enters in heavy metal adsorption device 6 and carries out adsorption treatment, the leacheate after purification is again back in soil under the effect of peristaltic pump 8, and soil is carried out drip washing again；
D leacheate is repeatedly discharged by () so iterative cycles afterwards.
The invention have the benefit that leacheate is in continuous flow regime, the mixing with soil is comparatively abundant, enhances the mass transport process of soil and leacheate, improves heavy metals removal effect.Additionally, the drainage rates of this technique is fast, efficiency is high, and is not easily blocked.
Claims (10)
1. the device removing heavy metal in soil, it is characterized in that: include being embedded in the capillary penetrating drainage band (2) of contaminated soil layer (1) bottom, the collector pipe (3) connected with capillary penetrating drainage band (2), the heavy metal adsorption device (6) being connected with the outlet of collector pipe (3), the peristaltic pump (7) being connected with the outlet of heavy metal adsorption device (6), peristaltic pump (7) is for being transmitted back in contaminated soil layer (1) by water inlet pipe by leacheate (4), capillary penetrating drainage band (2) is provided with multiple spaced interior big outer little capillary aqueduct, capillary aqueduct connects with collector pipe (3).
2. the device removing heavy metal in soil as claimed in claim 1, it is characterised in that: described capillary penetrating drainage band (2) is the flat belt-like structure being made up of flexible material.
3. the device removing heavy metal in soil as claimed in claim 1 or 2, it is characterized in that: capillary penetrating drainage band (2) is spaced in the width direction and extension is provided with multiple osculum (21) in length direction, each osculum (21) vertically extends to form the groove (22) running through capillary penetrating drainage band (2) end face downwards, the width of groove (22) forms described capillary aqueduct less than the diameter of osculum (21), osculum (21) and groove (22).
4. the device removing heavy metal in soil as claimed in claim 3, it is characterized in that: capillary penetrating drainage band (2) offers the osculum that diameter is 1mm (21) every 1.5mm, every osculum (21) longitudinally cuts groove (22) wide for 0.3mm open again.
5. the device removing heavy metal in soil as claimed in claim 1, it is characterized in that: the upper longitudinally spaced mounting groove offered for grafting capillary penetrating drainage band (2) of collector pipe (3), capillary penetrating drainage band (2) tilts to insert in mounting groove.
6. the device removing heavy metal in soil as claimed in claim 5, it is characterised in that: the angle of capillary penetrating drainage band 2 and mounting groove is 1～90 °.
7. the device removing heavy metal in soil as claimed in claim 1, it is characterised in that: state heavy metal adsorption device (6) for heavy metal adsorption post, wherein equipped with the macromolecule polymer material of Adsorption of Heavy Metals or natural minerals.
8. the device removing heavy metal in soil as claimed in claim 7, it is characterised in that: described macromolecule polymer material is the one in shell element, cellulose, chitosan or its mixing, and described natural minerals is the one in zeolite, kieselguhr or its mixing.
9. the method removing heavy metal in soil, it is characterised in that: adopt arbitrary described device in claim 1-8 to carry out, said method comprising the steps of:
A capillary penetrating drainage band (2) and coupled collector pipe (3) are laid in the bottom of contaminated soil layer (2) by (), when burying underground, the notch of groove (22) is downward；
B leacheate (4) is added contaminated soil layer (1) by (), and leacheate (4) is stirred with mixing with soil to carry out drip washing, leacheate after eluting heavy metal rapidly enters in collector pipe (3) under the effect of capillary penetrating drainage band (2), thus being discharged soil；
C () leacheate containing heavy metal enters in heavy metal adsorption device (6) and carries out adsorption treatment, the leacheate after purification is again back in soil under the effect of peristaltic pump (8), and soil is carried out drip washing again；
D leacheate is repeatedly discharged by () so iterative cycles afterwards.
10. the method removing heavy metal in soil as claimed in claim 1, it is characterised in that described leacheate is prepared by the conventional eluent of chemical leaching method, including: organic acid, mineral acid, alkali, chelating agen or surfactant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610292164.5A CN105750318A (en) | 2016-05-05 | 2016-05-05 | Device and method for removing heavy metals in soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610292164.5A CN105750318A (en) | 2016-05-05 | 2016-05-05 | Device and method for removing heavy metals in soil |
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| CN105750318A true CN105750318A (en) | 2016-07-13 |
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| CN201610292164.5A Pending CN105750318A (en) | 2016-05-05 | 2016-05-05 | Device and method for removing heavy metals in soil |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734180A (en) * | 2017-03-14 | 2017-05-31 | 北京建工环境修复股份有限公司 | Chemical leaching system and its method for arranging that a kind of farmland pollution is administered |
| CN106734143A (en) * | 2016-12-09 | 2017-05-31 | 天津天润益康环保科技有限公司 | A kind of drip washing prosthetic device of heavy-metal contaminated soil |
| CN106881340A (en) * | 2017-03-14 | 2017-06-23 | 北京建工环境修复股份有限公司 | A kind of administering method in heavy metal pollution farmland |
| CN107442564A (en) * | 2017-09-01 | 2017-12-08 | 长江水利委员会长江科学院 | A kind of integrated flexible electro reclamation device and method laid suitable for mechanization |
| CN109365499A (en) * | 2018-10-26 | 2019-02-22 | 知合环境（北京）有限责任公司 | A kind of subsurface system, its laying method and purposes |
| CN109454102A (en) * | 2019-01-04 | 2019-03-12 | 北京高能时代环境技术股份有限公司 | A kind of elution of chromium slag contaminated soil-stabilisation combined remediation method |
| CN112958619A (en) * | 2021-02-02 | 2021-06-15 | 辽宁工程技术大学 | Fermentation chemical remediation method and device for heavy metal polluted underground water |
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Application publication date: 20160713 |