CN111282954A - Sodium sulfide waste residue soil pollution risk management and control system - Google Patents
Sodium sulfide waste residue soil pollution risk management and control system Download PDFInfo
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- CN111282954A CN111282954A CN202010089108.8A CN202010089108A CN111282954A CN 111282954 A CN111282954 A CN 111282954A CN 202010089108 A CN202010089108 A CN 202010089108A CN 111282954 A CN111282954 A CN 111282954A
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- layer
- seepage
- sodium sulfide
- waste residue
- impermeable
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- 239000002699 waste material Substances 0.000 title claims abstract description 66
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910052979 sodium sulfide Inorganic materials 0.000 title claims abstract description 60
- 238000003900 soil pollution Methods 0.000 title claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 28
- 239000002689 soil Substances 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 129
- 239000011241 protective layer Substances 0.000 claims description 34
- 239000000872 buffer Substances 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 7
- 239000002585 base Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 4
- 239000004021 humic acid Substances 0.000 claims description 4
- BWGNESOTFCXPMA-UHFFFAOYSA-N Dihydrogen disulfide Chemical compound SS BWGNESOTFCXPMA-UHFFFAOYSA-N 0.000 claims description 3
- 238000004873 anchoring Methods 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 claims description 3
- 235000013311 vegetables Nutrition 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000002386 leaching Methods 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 description 13
- 239000002893 slag Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- CPJSUEIXXCENMM-UHFFFAOYSA-N phenacetin Chemical compound CCOC1=CC=C(NC(C)=O)C=C1 CPJSUEIXXCENMM-UHFFFAOYSA-N 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- -1 sulfur cyan, sulfur Chemical compound 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229920000265 Polyparaphenylene Polymers 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 239000002221 antipyretic Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000002951 depilatory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229960003893 phenacetin Drugs 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 description 1
- HYHCSLBZRBJJCH-UHFFFAOYSA-N sodium polysulfide Chemical compound [Na+].S HYHCSLBZRBJJCH-UHFFFAOYSA-N 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000988 sulfur dye Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- GTLDTDOJJJZVBW-UHFFFAOYSA-N zinc cyanide Chemical compound [Zn+2].N#[C-].N#[C-] GTLDTDOJJJZVBW-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a sodium sulfide waste residue soil pollution risk management and control system, wherein a bottom anti-seepage system is positioned at the bottom of sodium sulfide waste residue, a vertical anti-seepage system is arranged around the sodium sulfide waste residue, and a field sealing system is arranged at the top and the side surface of the sodium sulfide waste residue; the leachate treatment system is used for collecting leachate generated by the sodium sulfide waste residue. The invention effectively prevents rainwater from leaching the sodium sulfide waste residue, reduces the generation of leachate, prevents the sodium sulfide waste residue leachate from polluting soil and underground water, and collects and treats the sodium sulfide waste residue leachate.
Description
Technical Field
The invention belongs to the technical field of risk management and control of polluted plots, and particularly relates to a sodium sulfide waste residue soil pollution risk management and control system.
Background
The sodium sulfide is used as a basic chemical raw material and a necessity of national life, is widely applied to various industry fields, and is used for manufacturing sulfur dyes, sulfur cyan, sulfur blue or dye intermediate reducing agents, mordants and the like in the dye industry; as a flotation agent for ores in the nonferrous industry; depilatory for hides in the tanning industry; cooking agent for paper pulp in the paper industry. Sodium sulfide is also used in the manufacture of sodium sulfide, sodium polysulfide, sodium hydrosulfide, and the like. The method is used in cyanide zinc plating and silver alloy plating electrolyte and silver recovery in electroplating. Also widely used in industries such as pigment, rubber, etc. Also used for rayon denitration and reduction of nitrated compounds. In the pharmaceutical industry, it is used for producing antipyretic drugs such as phenacetin. In recent years, the rapid development of the production of Chinese high-grade environmental protection coatings, high-grade special engineering plastics, polyphenylene (aryl) sulfide and polysulfide rubber and other high, fine and sharp industries promotes the flourishing of the sodium sulfide market. The production of sodium sulfide mainly adopts the steps of calcining raw material nitre, raw material coal (anthracite) and fuel coal (bituminous coal) at high temperature, then hot melting, evaporating the obtained concentrated alkali liquor and obtaining the sodium sulfide. The sodium sulfide produced by the method can generate a large amount of sodium sulfide waste residues, and the main components of the sodium sulfide waste residues comprise water-insoluble SiO2、A12O3And water-soluble substance Na2SO4、Na2S2O3、Na2CO3Etc., in strong basicity. Most of waste residue disposal is random stacking, the waste residue disposal is not strictly constructed according to the requirements of an industrial waste residue field, a large amount of percolate can be generated after the waste residue is leached by rainwater, an anti-seepage measure is not taken during construction of a percolate collecting pool, after the waste residue collecting pool is used for a long time, the pool bottom has a seepage phenomenon, the investigation result shows that the soil and the underground water at the lower parts of the waste residue field and the percolate collecting pool are polluted, the pH value of the soil is changed into extreme alkalinity, and the underground water is alkalineThe indexes such as sulfate, chloride, aluminum, nitrate and the like have larger difference compared with the background value. Meanwhile, the sodium sulfide waste residue can generate a large amount of hydrogen sulfide through rainwater leaching, and air is polluted.
In the existing alkali sulfide waste residue treatment technology, the top horizontal separation is mainly used, the bottom and the side surfaces are not prevented from seepage, the percolate is not collected and treated, and the pollution of the waste residue percolate to soil and underground water is not effectively prevented, so that the risk control of the alkali sulfide waste residue is carried out, and the effective control of the pollution of the percolate to the soil and the underground water is very important.
Disclosure of Invention
The invention aims to prevent the sodium sulfide waste residue leachate from polluting soil and underground water, and provides an economic and efficient sodium sulfide waste residue risk management and control system.
The purpose of the invention is realized by the following technical scheme:
a management and control system for the soil pollution risk of sodium sulfide waste residues comprises a bottom seepage-proofing system, a field sealing system, a vertical seepage-proofing system and a leachate treatment system;
the bottom anti-seepage system is positioned at the bottom of the sodium sulfide waste residue, the periphery of the sodium sulfide waste residue is provided with a vertical anti-seepage system, and the top and the side surfaces of the sodium sulfide waste residue are provided with field sealing systems;
the bottom anti-seepage system comprises an anti-seepage basic protective layer, a first anti-seepage layer, a second anti-seepage film protective layer, a flow guide layer, a first anti-seepage film protective layer and a first sodium sulfide waste residue buffer layer from bottom to top in sequence;
the sealing system comprises a top sealing system and a side sealing system; the top sealing system sequentially comprises a second alkali disulfide waste residue buffer layer, an exhaust layer, a fourth anti-seepage film protection layer, an anti-seepage base protection layer, a second anti-seepage layer, a third anti-seepage film protection layer, a drainage layer and a first vegetation layer from bottom to top;
the side sealing system comprises an anti-seepage base protective layer, a third anti-seepage layer, a fifth anti-seepage film protective layer, a lattice layer and a second vegetation layer from bottom to top in sequence;
the vertical seepage-proofing system comprises a slag-blocking retaining wall, a fourth seepage-proofing layer and a sixth seepage-proofing film protective layer are arranged on the inner side of the slag-blocking retaining wall, and the vertical seepage-proofing system is positioned around the sodium sulfide waste slag;
the leachate treatment system sequentially comprises a leachate adjusting tank, a leachate stirring tank, a leachate sedimentation tank and a leachate outlet tank, and a fifth anti-seepage layer is arranged in each tank of the leachate treatment system.
The leachate treatment system is used for collecting leachate generated by sodium sulfide waste residues.
The anti-seepage foundation protection layer is made of clay and needs to be compacted, and is located above the ground and below the anti-seepage film, the flow guide layer is made of pebble layers, the thickness of each pebble layer is 30-50 cm, drainage ditches are arranged in the flow guide layer, drainage pipes are distributed in the drainage ditches and connected with a leachate treatment system, and the exhaust layer and the drainage layer are provided with drainage nets.
The permeability coefficient of the impermeable basic protective layer clay is not more than 1 x 10-7cm/s。
The first sodium sulfide waste residue buffer layer and the second sodium sulfide waste residue buffer layer are humic acid layers, and the layer thickness is 3-5 cm.
The slope of the drainage ditch in the bottom anti-seepage system is required to ensure that percolate can rapidly flow to the percolate collecting tank, and the slope is not less than 2%.
The slope of the top of the sealing system is not less than 5%, when the slope of the side surface is greater than 10%, a plurality of steps are adopted, and the slope of the side surface between the steps is not greater than 1: 3, the step width is not smaller than 2 m.
The first vegetation layer is a planted shallow root system plant, the soil thickness is 50cm, and the lattice slope protection layer comprises a vegetation layer.
The slag blocking retaining wall is made of masonry, one half of the slag blocking retaining wall is buried under the earth surface, and an anchoring ditch is formed in the wall body of the slag blocking retaining wall.
The first impermeable layer, the second impermeable layer, the third impermeable layer, the fourth impermeable layer and the fifth impermeable layer are HDPE impermeable membranes with the thickness of 1.5mm, the first impermeable layer of the bottom impermeable system is connected with the bottom edge of the fourth impermeable layer of the vertical impermeable system, the upper edge of the fourth impermeable layer is connected with the lower edge of the third impermeable layer of the side sealing system, and the third impermeable layer is connected with the second impermeable layer of the top sealing system.
The first impermeable membrane protective layer, the second impermeable membrane protective layer, the third impermeable membrane protective layer, the fourth impermeable membrane protective layer, the fifth impermeable membrane protective layer and the sixth impermeable membrane protective layer are all geotextiles, and the specification of the geotextiles is not lower than 300g/m2。
The medicament added into the stirring tank of the percolate treatment system is calcium chloride so as to reduce the sulfate content in the percolate, and then the percolate is sent to a sewage treatment plant.
The invention has the beneficial effects that:
(1) the method adopted by the invention effectively prevents rainwater from leaching the sodium sulfide waste residues, and reduces the generation of leachate.
(2) The method adopted by the invention not only prevents the pollution of the sodium sulfide waste residue percolate to soil and underground water, but also collects and treats the sodium sulfide waste residue percolate;
(3) the humic acid buffer layer is adopted to buffer the sodium sulfide waste residue.
(4) The method of the invention has simple operation and easy implementation, and is suitable for practical engineering.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic view of a bottom anti-seepage system of the present invention;
FIG. 3 is a schematic view of a top seal system of the present invention;
FIG. 4 is a schematic view of a side seal system of the present invention;
FIG. 5 is a schematic view of a vertical seepage prevention system of the present invention;
figure 6 is a schematic view of a leachate treatment system of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and examples, without limiting the scope of the invention to the following.
As shown in fig. 1, a sodium sulfide waste residue soil pollution risk management and control system comprises a bottom seepage-proofing system 1, a closing system 2, a vertical seepage-proofing system 3 and a leachate treatment system 4;
the bottom anti-seepage system 1 is positioned at the bottom of the sodium sulfide waste residue, the periphery of the sodium sulfide waste residue is provided with a vertical anti-seepage system 3, and the top and the side surfaces of the sodium sulfide waste residue are provided with a field sealing system 2;
as shown in fig. 2, the bottom anti-seepage system 1 sequentially comprises an anti-seepage basic protection layer 5, a first anti-seepage layer 81, a second anti-seepage film protection layer 92, a diversion layer 10, a first anti-seepage film protection layer 91 and a first sodium sulfide waste slag buffer layer 111 from bottom to top;
as shown in fig. 3, the sealing system 2 includes a top sealing system and a side sealing system; the top sealing system comprises a second alkali disulfide waste residue buffer layer 112, an exhaust layer 12, a fourth anti-seepage film protective layer 94, an anti-seepage base protective layer 52, a second anti-seepage layer 82, a third anti-seepage film protective layer 93, a drainage layer 100 and a first vegetation layer 131 from bottom to top in sequence;
as shown in fig. 4, the side sealing system sequentially includes, from bottom to top, an impermeable base protective layer 53, a third impermeable layer 83, a fifth impermeable film protective layer 95, a lattice layer 14, and a second vegetation layer 132;
as shown in fig. 5, the vertical seepage-proofing system 3 comprises a slag-blocking wall 16, a fourth seepage-proofing layer 84 and a sixth seepage-proofing film protective layer 96 are arranged on the inner side of the slag-blocking wall 16, and the vertical seepage-proofing system 3 is positioned around the sodium sulfide waste slag;
the leachate treatment system 4 is used for collecting leachate generated by sodium sulphide waste.
As shown in fig. 6, the leachate treatment system 4 sequentially comprises a leachate adjusting tank 18, a leachate stirring tank 19, a leachate settling tank 20, and a leachate outlet tank 21, wherein a fifth impermeable layer 85 is disposed in each tank of the leachate treatment system 4.
The anti-seepage basic protection layer 5 is clay which needs to be compacted and is located above the ground and below the anti-seepage film, the flow guide layer 10 comprises a pebble layer, the thickness of the pebble layer is 30-50 cm, a drainage ditch 6 is arranged in the flow guide layer 10, drainage pipes 7 are distributed in the drainage ditch 6, and the drainage pipes 7 are connected with the leachate treatment system 4.
The permeability coefficient of the impermeable basic protection layer 5 clay is not more than 1 x 10-7cm/s。
The first sodium sulfide waste buffer layer 111 and the second sodium sulfide waste buffer layer 112 are humic acid layers, and the layer thickness is 3-5 cm.
The first vegetation layer 131 and the second vegetation layer 132 are both planted plants with shallow root systems, the thickness of a soil layer is 50cm, and the lattice slope protection layer comprises the vegetation layers.
The slag blocking retaining wall 16 is made of masonry, one half of the slag blocking retaining wall 16 is buried under the earth surface, and an anchoring ditch 17 is formed in the wall body of the slag blocking retaining wall 16.
The first impermeable layer 81, the second impermeable layer 82, the third impermeable layer 83, the fourth impermeable layer 84 and the fifth impermeable layer 85 are HDPE impermeable films with the thickness of 1.5mm, the first impermeable layer 81 of the bottom impermeable system 1 is connected with the bottom edge of the fourth impermeable layer 84 of the vertical impermeable system 3, the upper edge of the fourth impermeable layer 84 is connected with the lower edge of the third impermeable layer 83 of the side sealing system, and the third impermeable layer 83 is connected with the second impermeable layer 82 of the top sealing system.
The first impermeable membrane protective layer 91, the second impermeable membrane protective layer 92, the third impermeable membrane protective layer 93, the fourth impermeable membrane protective layer 94, the fifth impermeable membrane protective layer 95 and the sixth impermeable membrane protective layer 96 are all geotextiles, and the specification of the geotextiles is not lower than 300g/m2。
The medicament added into the stirring tank of the percolate treatment system is calcium chloride so as to reduce the sulfate content in the percolate, and then the percolate is sent to a sewage treatment plant.
Claims (10)
1. A management and control system for the soil pollution risk of sodium sulfide waste residues is characterized by comprising a bottom seepage-proofing system (1), a closing system (2), a vertical seepage-proofing system (3) and a leachate treatment system (4);
the bottom seepage-proofing system (1) is positioned at the bottom of the sodium sulfide waste residue, the vertical seepage-proofing system (3) is arranged around the sodium sulfide waste residue, and the top and the side surfaces of the sodium sulfide waste residue are provided with field sealing systems (2);
the bottom anti-seepage system (1) sequentially comprises an anti-seepage basic protection layer (51), a first anti-seepage layer (81), a second anti-seepage film protection layer (92), a flow guide layer (10), a first anti-seepage film protection layer (91) and a first sodium sulfide waste residue buffer layer (111) from bottom to top;
the sealing system (2) comprises a top sealing system and a side sealing system; the top sealing system sequentially comprises a second alkali disulfide waste residue buffer layer (112), an exhaust layer (12), a fourth anti-seepage film protective layer (94), an anti-seepage base protective layer (52), a second anti-seepage layer (82), a third anti-seepage film protective layer (93), a drainage layer (100) and a first vegetable layer (131) from bottom to top;
the side sealing system comprises an anti-seepage base protective layer (53), a third anti-seepage layer (83), a fifth anti-seepage film protective layer (95) and a lattice slope protection layer (14) from bottom to top in sequence;
the vertical seepage-proofing system (3) comprises a slag-blocking retaining wall (16), a fourth seepage-proofing layer (84) and a sixth seepage-proofing film protective layer (96) are arranged on the inner side of the slag-blocking retaining wall (16), and the vertical seepage-proofing system (3) is positioned around the sodium sulfide waste residues;
the leachate treatment system (4) sequentially comprises a leachate adjusting tank (18), a leachate stirring tank (19), a leachate settling tank (20) and a leachate outlet tank (21), and a fifth impervious layer (85) is arranged in each tank of the leachate treatment system (4).
2. The sodium sulfide waste residue soil pollution risk management and control system as claimed in claim 1, wherein the anti-seepage basic protection layer (5) is clay, the flow guide layer (10) is a pebble layer, the thickness of the pebble layer is 30-50 cm, a drainage ditch (6) is arranged in the flow guide layer (10), drainage pipes (7) are distributed in the drainage ditch (6), the drainage pipes (7) are connected with the leachate treatment system (4), and drainage nets are adopted in the drainage layer and the drainage layer.
3. The sodium sulfide waste residue soil pollution risk management and control system as claimed in claim 1, wherein the permeability coefficient of clay of the impermeable basic protection layer (5) is not more than 1 x 10-7cm/s。
4. The sodium sulfide waste residue soil pollution risk management and control system of claim 1, wherein the first sodium sulfide waste residue buffer layer (111) and the second sodium sulfide waste residue buffer layer (112) are humic acid layers, and the thickness of each layer is 3-5 cm.
5. The sodium sulfide waste residue soil pollution risk management and control system according to claim 1, wherein the slope of the drainage ditch in the bottom anti-seepage system is such that leachate can flow rapidly to the leachate collection tank, and the slope is not less than 2%.
6. The sodium sulfide waste residue soil pollution risk management and control system as claimed in claim 1, wherein the slope of the top of the sealing system (2) is not less than 5%, when the slope of the side surface is greater than 10%, a multi-stage step is adopted, and the slope of the side surface between the steps is not greater than 1: and 3, the step width is not less than 2 m.
7. The sodium sulfide waste residue soil pollution risk management and control system as claimed in claim 1, wherein the first vegetation layer (131) is a planted shallow root system plant, the soil layer thickness is 50cm, and the lattice slope protection layer comprises a vegetation layer.
8. The sodium sulfide waste residue soil pollution risk management and control system as claimed in claim 1, wherein the residue blocking retaining wall (16) is made of masonry, half of the residue blocking retaining wall (16) is buried under the earth surface, and an anchoring ditch (17) is formed in the wall body of the residue blocking retaining wall (16).
9. The alkali sulfide waste residue soil pollution risk management and control system according to claim 1, wherein the first impermeable layer (81), the second impermeable layer (82), the third impermeable layer (83), the fourth impermeable layer (84) and the fifth impermeable layer (85) are 1.5mm HDPE impermeable films, the first impermeable layer (81) of the bottom impermeable system (1) is connected with the bottom edge of the fourth impermeable layer (84) of the vertical impermeable system (3), the upper edge of the fourth impermeable layer (84) is connected with the lower edge of the third impermeable layer (83) of the side sealing system, and the third impermeable layer (83) is connected with the second impermeable layer (82) of the top sealing system.
10. The sodium sulfide waste residue soil pollution risk management and control system according to claim 1, wherein the first impermeable film protection layer (91), the second impermeable film protection layer (92), and the third impermeable film protection layer(s) ((93) The fourth impermeable film protective layer (94), the fifth impermeable film protective layer (95) and the sixth impermeable film protective layer (96) are all geotextiles, and the specification of the geotextiles is not lower than 300g/m2。
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