CN111906114A - Safe ecological system for treating heavy metal solid waste - Google Patents
Safe ecological system for treating heavy metal solid waste Download PDFInfo
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- CN111906114A CN111906114A CN202010631456.3A CN202010631456A CN111906114A CN 111906114 A CN111906114 A CN 111906114A CN 202010631456 A CN202010631456 A CN 202010631456A CN 111906114 A CN111906114 A CN 111906114A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 39
- 239000002910 solid waste Substances 0.000 title claims abstract description 38
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 239000002689 soil Substances 0.000 claims abstract description 29
- 239000002699 waste material Substances 0.000 claims abstract description 26
- 235000015097 nutrients Nutrition 0.000 claims abstract description 11
- 239000003673 groundwater Substances 0.000 claims description 27
- 241000196324 Embryophyta Species 0.000 claims description 15
- 229920001903 high density polyethylene Polymers 0.000 claims description 8
- 239000004700 high-density polyethylene Substances 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 7
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 6
- 235000016709 nutrition Nutrition 0.000 claims description 5
- 230000035764 nutrition Effects 0.000 claims description 5
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical group C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 claims description 4
- 241001494508 Arundo donax Species 0.000 claims description 4
- 241000723346 Cinnamomum camphora Species 0.000 claims description 4
- 241001428136 Grateloupia filicina Species 0.000 claims description 4
- 235000011201 Ginkgo Nutrition 0.000 claims description 3
- 235000008100 Ginkgo biloba Nutrition 0.000 claims description 3
- 240000000950 Hippophae rhamnoides Species 0.000 claims description 3
- 235000003145 Hippophae rhamnoides Nutrition 0.000 claims description 3
- 241000830535 Ligustrum lucidum Species 0.000 claims description 3
- 241000124844 Sedum alfredii Species 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 210000000582 semen Anatomy 0.000 claims description 3
- 241000878006 Miscanthus sinensis Species 0.000 claims description 2
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- 206010028980 Neoplasm Diseases 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- 201000011510 cancer Diseases 0.000 description 1
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- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000010814 metallic waste Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B1/00—Dumping solid waste
- B09B1/004—Covering of dumping sites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
- B09C1/105—Reclamation of contaminated soil microbiologically, biologically or by using enzymes using fungi or plants
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mycology (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Botany (AREA)
- Biotechnology (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Soil Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a safe ecological system for treating heavy metal solid waste, which comprises a base layer at the bottom of a reservoir, a flow guide layer of underground water, a compacted clay layer, a percolate flow guide layer, a waste stack layer, a covering soil layer in the middle of a sealing field, a sealing field exhaust layer, a sealing field compacted clay layer, a sealing field drainage layer, a nutrient soil layer and an ecological greening layer; a first geomembrane is arranged between the reservoir bottom foundation layer and the underground water diversion layer; a second geomembrane is arranged between the underground water diversion layer and the compacted clay layer; a third geomembrane and a fourth geomembrane are arranged between the compacted clay layer and the percolate flow guide layer; and a fifth geomembrane is arranged between the percolate flow guide layer and the waste stack layer. Each geomembrane in the system can play the roles of protecting, blocking and isolating, and the heavy metal content in the nutrient soil layer is greatly reduced. The ecological greening layer is matched with multiple arbor-shrub-grass in an integrated manner, so that ecological restoration is realized. The application provides a safe ecosystem has the advantage that prevention of seepage standard is high, secondary pollution risk is low, environmental security is high.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a safe ecological system for treating heavy metal solid waste.
Background
With the development of agriculture and science and the continuous improvement of the living standard of people, the yield of domestic garbage and industrial solid waste is presented as a rapid growth trend. A large amount of various solid wastes not only occupy a large amount of land and cause pollution to farmlands, the atmosphere, water bodies and the like, but also easily spread diseases, and thus, the solid wastes need to be properly treated.
At present, the treatment mode of solid waste mainly comprises a heat treatment technology, a biological treatment technology, a solid treatment technology and a final treatment technology, wherein the safe landfill in the final treatment technology is a widely applied solid waste treatment method in China. Heavy metals are harmful to human bodies, for example, any heavy metal can cause headache, insomnia, nerve disorder, arthralgia, calculus, cancer and the like of people, and particularly, cells, organs, skin, bones and nerves of the digestive system and the urinary system are damaged more seriously, so that solid wastes containing heavy metals such as mercury, cadmium, arsenic and lead are required to be properly treated for landfill, and the treatment of the solid wastes containing heavy metals is a problem to be solved urgently.
Disclosure of Invention
The invention provides a safe ecological system for treating heavy metal solid waste, which is used for properly treating the heavy metal-containing solid waste.
The invention provides a safe ecological system for treating heavy metal solid waste, which comprises a base layer at the bottom of a reservoir, an underground water diversion layer, a compacted clay layer, a percolate diversion layer, a waste stack layer, a covering soil layer in the middle of a sealing field, a sealing field exhaust layer, a sealing field compacted clay layer, a sealing field drainage layer, a nutrient soil layer and an ecological greening layer which are sequentially arranged from bottom to top;
a first geomembrane is arranged between the reservoir bottom foundation layer and the underground water diversion layer;
a second geomembrane is arranged between the underground water diversion layer and the compacted clay layer;
a third geomembrane and a fourth geomembrane are arranged between the compacted clay layer and the percolate flow guide layer; the fourth geomembrane is positioned between the third geomembrane and the leachate diverting layer;
and a fifth geomembrane is arranged between the percolate flow guide layer and the waste stack layer.
Preferably, the bottom of the groundwater diversion layer is provided with a groundwater diversion blind ditch, and a groundwater drainage pipe is arranged in the groundwater diversion blind ditch.
Preferably, the compacted density of the compacted clay layer is more than or equal to 95 percent, and the hydraulic transmission coefficient is less than or equal to 1 x 10-7m/s。
Preferably, a percolate guide blind ditch is arranged at the bottom of the percolate guide layer, and percolate drainage pipes are arranged in the percolate guide blind ditch.
Preferably, the waste stack layer adopts modified clay and FeSO4Stably solidifying, the heavy metal solid waste in the waste stack layer, the modified clay and the FeSO4In a weight ratio of 100:20: 4.
Preferably, the thicknesses of the field sealing middle covering soil layer, the field sealing exhaust layer, the field sealing compacted clay layer, the field sealing drainage layer and the nutrition soil layer are respectively 400mm for 300-.
Preferably, the ecological greening layer is a georgette-herbaceous plant multi-element integrated plant; the arbor plant is selected from Cinnamomum camphora, semen Ginkgo, and fructus Cinnamomi; the said plant is selected from Ligustrum lucidum ait, Arundo donax Linn and Hippophae rhamnoides; the herbaceous plant is selected from Grateloupia filicina, Sedum alfredii and Miscanthus sinensis.
Preferably, the first geomembrane, the second geomembrane, the third geomembrane, the fourth geomembrane and the fifth geomembrane are all high density polyethylene geomembranes.
Preferably, the first and fifth geomembranes have a gauge of 240g/m2(ii) a The specification of the fourth geomembrane is 600g/m2(ii) a The thickness of the third geomembrane is 1-2 mm; the specification of the second geomembrane is 300g/m2。
Preferably, both the groundwater flow guiding layer and the percolate flow guiding layer are filled with pebbles, gravel or crushed stones.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention provides a safe ecological system for treating heavy metal solid waste, which comprises a base layer at the bottom of a reservoir, an underground water diversion layer, a compacted clay layer, a percolate diversion layer, a waste stack layer, a covering soil layer in the middle of a sealing field, a sealing field exhaust layer, a sealing field compacted clay layer, a sealing field drainage layer, a nutrient soil layer and an ecological greening layer which are sequentially arranged from bottom to top; a first geomembrane is arranged between the reservoir bottom foundation layer and the underground water diversion layer; a second geomembrane is arranged between the underground water diversion layer and the compacted clay layer; a third geomembrane and a fourth geomembrane are arranged between the compacted clay layer and the percolate flow guide layer; the fourth geomembrane is positioned between the third geomembrane and the leachate diverting layer; and a fifth geomembrane is arranged between the percolate flow guide layer and the waste stack layer. In the system, a first geomembrane is arranged between a reservoir bottom foundation layer and an underground water flow guide layer, a second geomembrane is arranged between the underground water flow guide layer and a compacted clay layer, a third geomembrane and a fourth geomembrane are arranged between the compacted clay layer and a percolate flow guide layer, and a fifth geomembrane is arranged between the percolate flow guide layer and a waste pile layer, wherein each geomembrane plays the roles of protecting, blocking and isolating, and the heavy metal content in a nutrient soil layer can be greatly reduced. In addition, the ecological greening layer planted on the nutrient soil layer is matched with arbor-shrub-grass in a multi-element mode, and ecological restoration is achieved. The application provides a handle heavy metal solid waste's safe ecosystem has the advantage that prevention of seepage standard is high, the secondary pollution risk is low, environmental security is high.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a structural diagram of a safety ecosystem for treating heavy metal solid waste according to an embodiment of the present invention;
the symbols represent:
1-a reservoir bottom base layer, 2-an underground water diversion layer, 3-a compacted clay layer, 4-a percolate diversion layer, 5-a waste stack layer, 6-a closure middle covering soil layer, 7-a closure exhaust layer, 8-a closure compacted clay layer, 9-a closure drainage layer, 10-a nutrient soil layer, 11-an ecological greening layer, 12-a first geomembrane, 13-a second geomembrane, 14-a third geomembrane, 15-a fourth geomembrane, 16-a fifth geomembrane, 17-an underground water diversion blind ditch, 18-an underground water calandria, 19-a percolate diversion blind ditch and 20-a percolate calandria.
Detailed Description
Referring to fig. 1, fig. 1 is a structural diagram illustrating a safe ecosystem for treating heavy metal solid waste according to an embodiment of the present application. As can be seen from the attached drawing 1, the safe ecological system for treating heavy metal solid waste provided by the embodiment of the application comprises a reservoir bottom base layer 1, an underground water diversion layer 2, a compacted clay layer 3, a percolate diversion layer 4, a waste stack layer 5, a seal cover middle soil covering layer 6, a seal cover exhaust layer 7, a seal cover compacted clay layer 8, a seal cover drainage layer 9, a nutrient soil layer 10 and an ecological greening layer 11 which are sequentially arranged from bottom to top, wherein a first geomembrane 12 is arranged between the reservoir bottom base layer 1 and the underground water diversion layer 2; a second geomembrane 13 is arranged between the underground water diversion layer 2 and the compacted clay layer 3; a third geomembrane 14 and a fourth geomembrane 15 are arranged between the compacted clay layer 3 and the percolate flow guiding layer 4, and the fourth geomembrane 15 is positioned between the third geomembrane 14 and the percolate flow guiding layer 4; a fifth geomembrane 16 is arranged between the percolate flow guiding layer 4 and the waste stack layer 5.
Specifically, the base layer 1 is the bottommost layer of the reservoir area, which is a clay layer. The compaction density of the base layer 1 is not less than 95%, and the thickness is 800-1000 mm. More preferably, the thickness of the library bottom base layer 1 is 850 mm. The underground water diversion layer 2 is the upper layer of the base layer 1 at the bottom of the reservoir and is used for diversion and output of underground water. Be equipped with first geomembrane 12 between storehouse bottom foundation layer 1 and groundwater water conservancy diversion layer 2, this first geomembrane 12 set up can prevent the groundwater seepage, realize the collection to groundwater, and then export the groundwater water conservancy diversion of collecting through groundwater water conservancy diversion layer 2. The groundwater diversion layer 2 in the embodiment of the application is formed by filling pebbles, gravels or crushed stones with the grain diameter of 32-64mm, the filling thickness is 400-500mm, and preferably, the filling thickness of the groundwater diversion layer 2 is 400 mm.
Further, a groundwater guiding blind ditch 17 is arranged at the bottom of the groundwater guiding layer 2, and a groundwater drainage pipe 18 is arranged in the groundwater guiding blind ditch 17. The underground water guide blind ditch 17 is in a concave form and is used for collecting underground water, and the collected underground water is led out through an underground water discharge pipe 18. Pebbles, gravels or broken stones with the particle size of 16-32mm are filled between the underground water diversion blind ditch 17 and the underground water discharge pipe 18. Further, the underground water discharging pipe 18 is a high density polyethylene pipe, and a plurality of underground water collecting holes (not shown) for collecting the underground water from the underground water guiding blind ditch 17 are provided in the underground water discharging pipe 18. More preferably, the diameter of the underground water collecting hole is 16-22mm, and the hole distance between two adjacent underground water collecting holes is 60-80 mm.
The compacted clay layer 3 is a clay layer positioned above the underground water diversion layer 2. The compacted density of the compacted clay layer 3 is more than or equal to 95 percent, and the hydraulic transmission coefficient is less than or equal to 1 multiplied by 10-7m/s. Be equipped with second geomembrane 13 between groundwater diversion layer 2 and the compaction clay layer 3, this second geomembrane 13 can the separation the clay in the compaction clay layer 3, and then prevents that groundwater diversion layer 2 from taking place to block up, reaches the purpose of carrying out the protection to groundwater diversion layer 2.
The percolate guiding layer 4 is a layer above the compacted clay layer 3 and is used for collecting and guiding percolate generated by heavy metal wastes in the waste stack layer 5 so as to prevent the compacted clay layer 3 and the third geomembrane 14 from being damaged due to overhigh water pressure of percolate generated in the waste stack layer 5. A third geomembrane 14 and a fourth geomembrane 15 are arranged between the compacted clay layer 3 and the percolate flow guiding layer 4, and the fourth geomembrane 15 is positioned between the third geomembrane 14 and the percolate flow guiding layer 4. The third geomembrane 14 serves to protect the compacted clay layer 3, and the fourth geomembrane 15 serves to protect the third geomembrane 14. The matching among the compacted clay layer 3, the third geomembrane 14 and the fourth geomembrane 15 can prevent leachate generated in the waste stack layer 5 from permeating into the lower soil. The percolate flow guiding layer 4 in the embodiment of the application is formed by filling filled pebbles, gravels or broken stones with the particle size of 16-32mm, and the thickness of the percolate flow guiding layer 4 is 500-600mm, preferably 550 mm.
Further, a percolate guide blind ditch 19 is arranged at the bottom of the percolate guide layer 4, and a percolate drainage pipe 20 is arranged in the percolate guide blind ditch 19. The percolate guide blind ditch 19 is in a concave form and is used for collecting percolate, and the collected percolate is guided out through a percolate discharge pipe 20. Pebbles, gravels or broken stones with the particle size of 8-16mm are filled between the percolate guide blind ditch 19 and the percolate calandria 20. Further, the percolate discharge pipe 20 is a high density polyethylene pipe, and a plurality of percolate collecting holes (not shown in the figure) are provided in the percolate discharge pipe 20, and are used for collecting percolate from the percolate guide blind drain 19. More preferably, the diameter of the percolate water collecting holes is 16-22mm, and the hole distance between two adjacent percolate water collecting holes is 60-80 mm.
The waste stack layer 5 is a flat layer for stacking heavy metal solid waste. The waste stack layer 5 in the embodiment of the application adopts modified clay and FeSO4The solid waste is used as a stable curing agent for stable curing, wherein the heavy metal solid waste, the modified clay and the FeSO in the waste stack layer 54In a weight ratio of 100:20: 4. Further, the modified clay is obtained by adding modification into common clay, wherein the addition amount of the sodium bentonite is 8% of the mass of the common clay. FeSO4FeSO with the concentration of 10 percent is adopted4And (3) solution.A fifth geomembrane 16 is arranged between the waste stack layer 5 and the percolate flow guiding layer 4, and the fifth geomembrane 16 is used for protecting the percolate flow guiding layer 4.
And after the waste stack layer 5 is filled with the heavy metal solid waste, filling clay on the surface of the heavy metal solid waste to form an intermediate covering soil layer 6 of the sealing field. The cover soil layer 6 in the middle of the sealing field can better isolate runoff, and prevent the runoff from immersing into the waste stack layer 5 to form percolate. The sealing exhaust layer 7 is used for collecting the stacking gas formed by stacking the heavy metal solid waste in the waste stacking layer 5 and guiding the stacking gas into the collecting tank. The sealing compaction clay layer 8 is used for preventing water seepage from entering the landfill body and preventing the overflowing of accumulated gas. The sealing drainage layer 9 is used for draining infiltrated groundwater and reducing the pressure of infiltrated water on a lower impermeable layer. The nutrient soil layer 10 is used for providing soil for plant growth and other natural soil, and is used for protecting an impermeable layer from being damaged by drying shrinkage, freeze thawing and the like, so as to prevent a drainage layer from being blocked, maintain stability and provide nutrition for the ecological greening layer 11. Ecological greening layer 11 is used for planting plants to realize ecological restoration. The ecological greening layer 11 in the embodiment of the present application is a georgette-shrubbery-herbaceous plant multi-element plant. Wherein the arbor plant is selected from Cinnamomum camphora, semen Ginkgo and fructus Cinnamomi Immaturus, preferably Cinnamomum camphora; the plant is selected from Ligustrum lucidum ait, Arundo donax Linn and Hippophae rhamnoides, preferably Arundo donax Linn; the herb is selected from Grateloupia filicina, Sedum alfredii Hance and Mangifera Indica, preferably Grateloupia filicina.
In the embodiment of the application, the middle covering soil layer 6 of the sealing field is an clay layer with the thickness of 300-400mm, and the preferable thickness is 350 mm. The thickness of the seal gas exhaust layer 7 is 250-350mm, preferably 300mm, and the seal gas exhaust layer is filled with pebbles, gravels or broken stones with the particle size of 32-64 mm. The field sealing compacted clay layer 8 has a thickness of 300-400mm, preferably 350 mm. The thickness of the sealing drainage layer 9 is 250-350mm, and the sealing drainage layer is filled with quartz sand with the grain diameter of 32-64 mm. The thickness of the nutrition soil layer 10 is 300-350mm, and the preferable thickness is 325 mm.
In the embodiment of the present application, the first geomembrane 12, the second geomembrane 13, the third geomembrane 14, the fourth geomembrane 15 and the fifth geomembrane 16 are all high density polyethylene geomembranes. High density polyethylene resists corrosion by acid, alkali and various saltsThe high-density polyethylene has the characteristics of good wear resistance, electrical insulation, toughness and cold resistance and good chemical stability, and in addition, the high-density polyethylene also has the advantages of small permeability to water vapor and air and low water absorption, and is suitable for preparing the geomembrane. Further, the first geomembrane 12 and the fifth geomembrane 16 have a specification of 240g/m2(ii) a The specification of the fourth geomembrane 15 is 600g/m2(ii) a The thickness of the third geomembrane 14 is 1-2 mm; the specification of the second geomembrane 13 is 300g/m2。
In the safe ecosystem who handles heavy metal solid waste that this application embodiment provided, be equipped with first geomembrane 12 between storehouse bottom foundation layer 1 and the groundwater diversion layer 2, be equipped with second geomembrane 13 between groundwater diversion layer 2 and the compaction clay layer 3, be equipped with third geomembrane 14 and fourth geomembrane 15 between compaction clay layer 3 and the leachate diversion layer 4, be equipped with fifth geomembrane 16 between leachate diversion layer 4 and the discarded object heap body layer 5, each geomembrane plays the protection, blocks, the purpose of keeping apart, can the heavy metal content in the nutrition soil layer 10 that significantly reduces. In addition, the ecological greening layer planted on the nutrient soil layer 10 is matched with arbor-shrub-grass in a multi-element mode, and ecological restoration is achieved. The safe ecosystem for treating heavy metal solid waste provided by the embodiment of the application has the advantages of high anti-seepage standard, low secondary pollution risk and high environmental safety.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It is to be understood that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A safe ecological system for treating heavy metal solid waste is characterized by comprising a base foundation layer (1), an underground water diversion layer (2), a compacted clay layer (3), a percolate diversion layer (4), a waste stack layer (5), a field-sealing middle covering soil layer (6), a field-sealing exhaust layer (7), a field-sealing compacted clay layer (8), a field-sealing drainage layer (9), a nutrient soil layer (10) and an ecological greening layer (11) which are sequentially arranged from bottom to top;
a first geomembrane (12) is arranged between the reservoir bottom foundation layer (1) and the underground water diversion layer (2);
a second geomembrane (13) is arranged between the underground water diversion layer (2) and the compacted clay layer (3);
a third geomembrane (14) and a fourth geomembrane (15) are arranged between the compacted clay layer (3) and the percolate flow guiding layer (4); the fourth geomembrane (15) being located between the third geomembrane (14) and the leachate guiding layer (4);
and a fifth geomembrane (16) is arranged between the percolate flow guide layer (4) and the waste stack layer (5).
2. The safety ecosystem for treating heavy metal solid waste according to claim 1, wherein a groundwater diversion blind ditch (17) is arranged at the bottom of the groundwater diversion layer (2), and a groundwater drainage pipe (18) is arranged in the groundwater diversion blind ditch (17).
3. The safe ecosystem for treating heavy metal solid waste according to claim 1, wherein the compacted clay layer (3) has a compacted density of 95% or more and a hydraulic transmission coefficient of 1 x 10 or less-7m/s。
4. The safety ecosystem for treating heavy metal solid waste according to claim 1, wherein a percolate guide blind ditch (19) is arranged at the bottom of the percolate guide layer (4), and percolate drainage pipes (20) are arranged in the percolate guide blind ditch (19).
5. The safety ecosystem for treating heavy metal solid waste according to claim 1, wherein the waste heap layer (5) employs modified clay and FeSO4Stably solidifying, the heavy metal solid waste in the waste stack layer (5) and the modified clay and the FeSO4In a weight ratio of 100:20: 4.
6. The safety ecosystem for treating heavy metal solid waste according to claim 1, wherein the thicknesses of the sealing field middle covering soil layer (6), the sealing field exhaust layer (7), the sealing field compacted clay layer (8), the sealing field drainage layer (9) and the nutrition soil layer (10) are respectively 400mm for 300-.
7. The safe ecosystem for treating heavy metal solid waste according to claim 1, wherein the ecological greening layer (11) is a georgette-shrubbery-herbaceous plant multi-integrated plant; the arbor plant is selected from Cinnamomum camphora, semen Ginkgo, and fructus Cinnamomi; the said plant is selected from Ligustrum lucidum ait, Arundo donax Linn and Hippophae rhamnoides; the herbaceous plant is selected from Grateloupia filicina, Sedum alfredii and Miscanthus sinensis.
8. The safe ecosystem for treating heavy metal solid waste according to claim 1, wherein the first, second, third, fourth and fifth geomembranes (12, 13, 14, 15, 16) are all high density polyethylene geomembranes.
9. According to the claimsThe safe ecosystem for treating heavy metal solid waste according to claim 8, wherein the first geomembrane (12) and the fifth geomembrane (16) have a specification of 240g/m2(ii) a The specification of the fourth geomembrane (15) is 600g/m2(ii) a The thickness of the third geomembrane (14) is 1-2 mm; the specification of the second geomembrane (13) is 300g/m2。
10. The safety ecosystem for the treatment of heavy metal solid waste according to claim 1, wherein the groundwater diverting layer (2) and the leachate diverting layer (4) are both filled with pebbles, gravel or crushed stone.
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