CN114149203B - Compound polymer modified bentonite anti-seepage barrier material and preparation method and application thereof - Google Patents
Compound polymer modified bentonite anti-seepage barrier material and preparation method and application thereof Download PDFInfo
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- CN114149203B CN114149203B CN202111333703.2A CN202111333703A CN114149203B CN 114149203 B CN114149203 B CN 114149203B CN 202111333703 A CN202111333703 A CN 202111333703A CN 114149203 B CN114149203 B CN 114149203B
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- 230000004888 barrier function Effects 0.000 title claims abstract description 136
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 title claims abstract description 91
- 229920000642 polymer Polymers 0.000 title claims abstract description 83
- 239000000463 material Substances 0.000 title claims abstract description 82
- 150000001875 compounds Chemical class 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 45
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 38
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 38
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 38
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000001913 cellulose Substances 0.000 claims abstract description 28
- 239000004927 clay Substances 0.000 claims abstract description 28
- 229920002678 cellulose Polymers 0.000 claims abstract description 23
- 239000011734 sodium Substances 0.000 claims abstract description 21
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 21
- -1 sodium modified bentonite Chemical class 0.000 claims abstract description 21
- 239000000440 bentonite Substances 0.000 claims description 34
- 229910000278 bentonite Inorganic materials 0.000 claims description 34
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- 238000005520 cutting process Methods 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- 239000000356 contaminant Substances 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
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- 229920003086 cellulose ether Polymers 0.000 claims description 2
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 19
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 15
- 239000002689 soil Substances 0.000 abstract description 15
- 230000009471 action Effects 0.000 abstract description 11
- 230000035699 permeability Effects 0.000 abstract description 9
- 239000005416 organic matter Substances 0.000 abstract description 6
- 239000010813 municipal solid waste Substances 0.000 abstract description 5
- 239000003344 environmental pollutant Substances 0.000 description 24
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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- 238000000926 separation method Methods 0.000 description 2
- 238000003900 soil pollution Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 239000008367 deionised water Substances 0.000 description 1
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
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- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 239000002759 woven fabric Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
- C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/30—Landfill technologies aiming to mitigate methane emissions
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A compound polymer modified bentonite anti-seepage barrier material, a preparation method and application thereof. The compound polymer modified bentonite anti-seepage barrier material comprises the following components in percentage by mass: 80-95% of sodium modified bentonite, 0.5-15% of polyanionic cellulose and 0.7-2.5% of hydroxypropyl methyl cellulose; the polyanionic cellulose and the hydroxypropyl methyl cellulose are the compound polymer. The permeability coefficient of the composite barrier material can still be kept extremely low for 20-500mmol/L heavy metal, organic matter or composite pollution solution, and can be reduced by 100 times compared with that of the traditional barrier material; the composite barrier can be used for vertical barrier barriers, horizontal barrier systems or geosynthetic clay liners in heavy metal industrial polluted sites, organic matter industrial polluted sites, household garbage landfill sites and the like, and greatly improves the seepage-proofing and pollutant-intercepting performance of the barrier systems or barriers under the action of the composite polluted soil and underground water.
Description
Technical Field
The invention relates to a compound polymer modified bentonite anti-seepage barrier material, and a preparation method and application thereof, and belongs to the technical field of barrier control of polluted sites or domestic garbage landfill sites.
Background
In recent years, with transformation or migration of industrial enterprises, a large number of old sites of industrial sites are left, and the pollution problem existing in the original sites and underground water in the sites is prominent, so that the health of human beings and the urban development are influenced. The industrial pollution sites have the characteristics of multiple pollutant types, high pollution concentration and multiple pollution sites. In addition, the solid wastes in China have various types and large yield. In 2018, the stockpiling amount of the solid wastes in China exceeds 600 million tons, and the occupied land exceeds 200 million hectares. The solid waste stockpiling can generate a large amount of leachate and harmful gas, and the leachate is rich in heavy metals such as lead, zinc, chromium, cadmium, magnesium, nickel, manganese and the like and organic matters such as COD, ammonia nitrogen, total phosphorus and the like. The high concentration of complex pollutants in these industrial contaminated sites and the complex pollutant-rich leachate in solid waste landfills can cause the soil to accumulate a large amount of pollutants, generate irritating toxic gases, contaminate groundwater, and finally permeate and diffuse to surrounding clean water sources, such as rivers, lakes and seas, thereby seriously affecting the environment and animal health.
In order to protect underground water resources and peripheral soil from being influenced by a polluted site, risk management and control are set as one of important treatment principles in a pollution site control guidance thought determined by a soil pollution control action plan and a soil pollution control law, and a vertical blocking technology is a common, effective and low-cost technical means for comprehensive treatment and risk management and control of the polluted site.
The vertical isolation technology of China originates from the construction of refuse landfill sites, and large landfill sites such as Hangzhou Tianzi ridge first stage, Suzhou Qizi mountain first stage, Nanchang wheat garden, Shanghai Laocang fourth stage, Taizhou gang Yang and Tangshan central area all apply the vertical separation barrier technology to avoid the seepage of percolate of the landfill sites from polluting underground water.
At present, the vertical barrier in the international and domestic environmental protection fields mainly comprises the following types: a soil-bentonite barrier; a cement-bentonite barrier; a soil-cement-bentonite barrier; a geomembrane-bentonite composite barrier; a geomembrane-cement-bentonite composite vertical barrier; the bentonite waterproof blanket is a barrier. These barrier barriers present certain drawbacks: the bentonite has good seepage resistance under the action of clean water. The existing polluted underground water has high pollution concentration and has a large amount of heavy metal and organic matter combined pollution, when bentonite is acted by high-concentration pollutants, the bentonite loses water and contracts, the expansion performance is reduced, the pore size of a soil body is increased, the quantity of the soil body is increased, the permeability coefficient of a soil-bentonite vertical barrier is obviously increased, and the performance of retarding the migration of the pollutants is obviously reduced. The large increase of the permeability coefficient can not meet the anti-seepage barrier requirements proposed by the geotechnical engineering technical specification of the sanitary landfill of the household garbage and the vertical barrier technical specification of the industrial polluted site, so that the barrier fails.
The materials for barrier in horizontal barrier systems are mainly Geosynthetic Clay Liners (GCL) andcompacted Clay Liner (CCL). The bentonite in the geosynthetic clay liner is used as one of main raw materials, and the permeability coefficient of the bentonite can be obviously increased under the action of high-concentration heavy metal/organic matters, so that the seepage-proofing performance of the bentonite is influenced; the clay liner material is clay, which has a general effect on heavy metal/organic matter adsorption and a permeability coefficient of less than 1 × 10 -7 cm/s, which easily causes the infiltration of contaminants.
Therefore, aiming at the defects existing in the vertical barrier, the horizontal barrier system or the geosynthetic clay liner, the development of the compound polymer modified bentonite anti-seepage barrier material aiming at high-concentration compound pollutants has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a compound polymer modified bentonite anti-seepage barrier material and a preparation method and application thereof, which can realize the following steps: (1) the anti-seepage barrier material has better chemical compatibility, and the anti-seepage performance of the anti-seepage barrier material is increased by 100 times compared with that of the traditional barrier material under the corrosion of heavy metal with high concentration (20-500mmol/L) and organic composite polluted solution, so that the barrier requirement is met; (2) the main body materials are all green and low-carbon materials, so that the pollution and energy consumption of the barrier material to the environment in the production process are reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a compound polymer modified bentonite anti-seepage barrier material comprises the following components in parts by mass: 80-95% of sodium modified bentonite, 0.5-15% of polyanionic cellulose (PAC) and 0.7-2.5% of hydroxypropyl methylcellulose (HPMC); the polyanionic cellulose (PAC) and the hydroxypropyl methyl cellulose (HPMC) are the compound polymer.
The improvement is that the polyanionic cellulose (PAC) is water-soluble cellulose ether prepared by chemically modifying natural cellulose, and the molecular weight is 10 4 -10 6 (ii) a The hydroxypropyl methyl cellulose (HPMC) belongs to one of non-ionic cellulose mixed ether, the 100-mesh standard sieve pass rate is more than 99%, and the molecular weight is 10 4 -10 6 。
The improvement is that the sodium modified bentonite belongs to high liquid limit montmorillonite clay, and aluminosilicate minerals mainly comprising montmorillonite minerals have particle size of less than 200 meshes, liquid limit of more than 220% and free expansion rate of more than 16mL/2 g.
The preparation method of the compound polymer modified bentonite anti-seepage barrier material comprises the following steps:
sodium modified bentonite, polyanionic cellulose and hydroxypropyl methyl cellulose are mixed according to the mass ratio of 82.9:15: 2.1-94.4: 4.9:0.7, adding the mixture into a dry powder stirrer, and stirring at the speed of 14-38r/min for 10-60min to prepare the compound polymer modified bentonite anti-seepage barrier material.
The composite polymer modified bentonite anti-seepage barrier material is applied to a vertical barrier, a horizontal barrier system or a geosynthetic clay liner, and the vertical barrier, the horizontal barrier system or the geosynthetic clay liner can be used for blocking composite pollutants with the concentration of 20-500 mmol/L.
As an improvement, the vertical barrier application is by excavation backfill, multi-axis deep agitation, high pressure jet, trench cutting deep agitation (TRD), or double wheel milling deep agitation (CSM).
As an improvement, the vertical barrier comprises a soil-bentonite vertical barrier, a soil-cement-bentonite series vertical barrier, a geomembrane-bentonite composite vertical barrier, a geomembrane-cement-bentonite series composite vertical barrier, or a bentonite waterproof blanket vertical barrier.
The compound polymer modified bentonite anti-seepage barrier material for high-concentration composite pollutants has the characteristics of keeping an extremely low permeability coefficient and good chemical compatibility under the action of high-concentration (20-500mmol/L) heavy metals and organic composite pollutants, and compared with the traditional barrier material, the compound polymer modified bentonite anti-seepage barrier material can reduce the permeability coefficient by 100 times, ensure the long-term anti-seepage retardation performance of a vertical barrier and a horizontal barrier system, greatly increase the breakdown time of the barrier or the system, and greatly improve the service life.
When the compound polymer modified bentonite anti-seepage barrier material is inThe application of the geosynthetic clay liner comprises the following specific steps: according to the sequence from bottom to top, a woven fabric layer, a compound polymer modified bentonite anti-seepage barrier material layer and a non-woven fabric layer are sequentially arranged, a compound polymer modified bentonite synthetic clay liner with the thickness of 7-10 mm and the width of 5m is manufactured by adopting a needle punching method, and the surface density of the compound polymer modified bentonite anti-seepage barrier material is more than 4.6kg/m 2 。
When the composite polymer modified bentonite barrier material is applied to a horizontal barrier system, the method specifically comprises the following steps:
step 1, pouring the composite polymer modified bentonite anti-seepage barrier material into a stirrer, adding dried and ground clay according to the mass fraction of the composite polymer modified bentonite not more than 10%, and uniformly stirring, wherein the water content is controlled to be 1-4% greater than the optimal water content of the clay (namely W op +1％≤W≤W op + 4%), the mixing time is not less than 5 minutes;
step 2, flattening the site according to survey data of the earlier-stage polluted site, paving compacted clay layers playing a role of an impervious layer at the bottom of the urban industrial heavy metal polluted site to be treated, wherein the total thickness of the compacted clay layers is 60cm, the compacted clay layers are paved in 3 layers according to the thickness of each 20cm, each layer needs to be tamped with clay mixed with the compound polymer modified bentonite impervious barrier material by using a road roller or a heavy tamping tamper, the degree of compaction of the compacted clay layers is controlled to be more than 90%, and after the construction is completed in one day, a covering object is placed above the compacted clay layers to prevent water from losing;
step 3, after the construction of the compacted clay layer is completed, cleaning the ground, ensuring the ground to be smooth, paving a geosynthetic clay liner modified by the compound polymer above the compacted clay layer, configuring a lap joint paste at the lap joint of adjacent geosynthetic clay liners by using the compound polymer modified bentonite anti-seepage barrier material, wherein the soil-water ratio (namely the mass ratio of the compound polymer modified bentonite material to water) of the lap joint paste at the upper liner lap joint is 1:6, the lower layer is 1:9, uniformly stirring by using an electric stirrer during configuration, and the lap joint width is 300mm and the thickness is 10-20 mm;
and 4, sequentially laying an HDPE geomembrane with the thickness of 2mm and a protective layer with the thickness of 30cm above the geosynthetic clay liner modified by the compound polymer, wherein the HDPE geomembrane is laid by adopting a welding method, the lap joint width is larger than 100mm, and the protective layer is a sand layer.
Meanwhile, the compound polymer modified bentonite anti-seepage barrier material aiming at the high-concentration compound pollutants can be applied to vertical barrier barriers by the methods of excavation backfill, multi-shaft deep stirring, high-pressure rotary spraying, channel cutting deep stirring (TRD), double-wheel milling deep stirring (CSM) and the like. The method has more applicable methods and can be applied to most of complex polluted sites.
The construction method is characterized in that the method is applied to a vertical barrier by an excavation backfill construction method aiming at the high-concentration compound pollutant compound polymer modified bentonite anti-seepage barrier material, and specifically comprises the following steps:
step 1) according to the early-stage survey report result, leveling the fields around the urban heavy metal industrial polluted field, the organic matter industrial polluted field, the composite polluted industrial polluted field and the household garbage landfill to be treated;
step 2), guide wall construction: according to the construction scheme, after the position of the vertical separation barrier is positioned, a guide wall is excavated at a corresponding position, the guide wall is of a cast-in-place concrete structure, the strength grade of concrete is not lower than C20, and the thickness of the guide wall is not smaller than 200 mm; the top surface of the guide wall is higher than the ground by 100mm and higher than the ground water level by more than 0.5m, the bottom of the guide wall is higher than the in-situ soil by more than 200mm, and the height of the guide wall is not less than 1.2 m; the outer side of the guide wall is filled with clay, the wall surface at the inner side of the guide wall is vertical, and the clear distance of the guide wall is widened by 40mm compared with the designed thickness of the underground water continuous wall; the guide wall concrete is weighed and poured, the form can be removed after 70% of the design strength is achieved, and the guide wall after the form removal is added with a counter brace and the like.
Step 3), excavating a groove to a watertight layer or a weakly permeable layer, and performing bentonite slurry wall protection in the groove; the bentonite slurry needs to be fully hydrated, and the sodium modified bentonite slurry is prepared by mixing sodium modified bentonite and water according to the mass ratio of 1: 10;
step 4), backfill material preparation: the excavated in-situ soil is removed from gravels, construction wastes and other impurities, the composite polymer modified bentonite anti-seepage barrier material is uniformly mixed with the in-situ soil in a stirring tank according to the mass fraction of 8-15%, a proper amount of tap water is added during the mixing process, the water content is controlled to prepare the vertical barrier backfill material of the composite polymer modified bentonite anti-seepage barrier material, the water content of the vertical barrier backfill material of the composite polymer modified bentonite is the corresponding water content of the backfill material under the medium slump value of 125mm,
and 5) backfilling the prepared backfill material of the compound polymer modified bentonite vertical barrier into the groove to finish the construction of the vertical barrier.
The method is applied to a vertical barrier by using multi-axis deep stirring, high-pressure rotary spraying, channel cutting deep stirring (TRD) and double-wheel milling deep stirring (CSM) methods aiming at the high-concentration compound pollutant compound polymer modified bentonite anti-seepage barrier material, and specifically comprises the following steps:
step 1) according to the early-stage survey report result, leveling the fields around the urban heavy metal industrial polluted field, the organic matter industrial polluted field, the composite polluted industrial polluted field and the household garbage landfill to be treated;
step 2), excavating a guide groove: according to a construction scheme, after the position of the vertical blocking barrier is positioned, a guide groove is dug at a corresponding position, the width of the guide groove is more than 1 meter, the height of the guide groove is more than 1 meter, and the side wall is ensured not to collapse;
step 3) preparation of compound polymer modified bentonite barrier material slurry: uniformly stirring the prepared composite polymer modified bentonite anti-seepage barrier material and tap water in a stirring pool according to the water-cement ratio of 2-3;
and 4) pressurizing the prepared compound polymer modified bentonite seepage-proofing barrier material slurry, pumping to a deep stirring machine, and constructing according to a four-stirring two-spraying process or a six-stirring three-spraying process to finish the construction of the vertical barrier.
Has the advantages that:
compared with the prior art, the compound polymer modified bentonite anti-seepage barrier material and the preparation method and the application thereof have many technical advantages:
1. according to the invention, sodium modified bentonite is modified by the composite polymer polyanionic cellulose (PAC) and hydroxypropyl methyl cellulose (HPMC) according to the mass fraction of claim 1, and hydrogel generated by the composite polymer is connected with bentonite particles to generate a bonding effect on dispersed particles; in addition, the bentonite can form an obvious three-dimensional cross-linked network structure, and in addition, hydrogel generated by the polymer occupies most of gaps of the bentonite or the blocking barrier backfill material, so that the effect of blocking the gaps is achieved;
2. according to the invention, sodium modified bentonite is modified by the composite polymer polyanionic cellulose (PAC) and hydroxypropyl methylcellulose (HPMC) according to the mass fraction of claim 1, the bentonite particles are smaller and finer under the combined action of the composite polymer, and the Zeta potential of the bentonite is more negative by the composite polymer;
3. according to the invention, sodium modified bentonite is modified by compounding polymers polyanionic cellulose (PAC) and hydroxypropyl methylcellulose (HPMC) according to the mass fraction of claim 1, and carboxyl in the polyanionic cellulose (PAC) and hydroxyl in the hydroxypropyl methylcellulose (HPMC) have chelation with heavy metal under the attack of high-concentration pollutants, so that the heavy metal is adsorbed. In addition, after the high-concentration pollutant contacts with the compound polymer, the polymer curls to wrap the pollutant, so that the bentonite is protected, and extremely high seepage-proofing and retarding performances are achieved;
4. according to the invention, sodium modified bentonite is modified by the composite polymer polyanionic cellulose (PAC) and hydroxypropyl methylcellulose (HPMC) according to the mass fraction of claim 1, and under the action of the composite polymer, part of bentonite agglomerate layers are stripped, the size of a sticky particle is reduced, the specific surface area is increased, and the anti-seepage performance is improved;
5. according to the invention, sodium modified bentonite is modified by compounding polymer polyanionic cellulose (PAC) and hydroxypropyl methylcellulose (HPMC) according to the mass fraction of claim 1, wherein the compounding polymer polyanionic cellulose (PAC) and the hydroxypropyl methylcellulose (HPMC) belong to nontoxic and harmless green materials, and the compounding polymer is commonly used in food additives.
6. The polymer modified bentonite anti-seepage barrier material compounded aiming at the high-concentration composite pollutants has the advantages of simple preparation process and wider applicable process, and can be used as vertical barrier backfill to improve the anti-seepage performance, the adsorption performance and the retardation migration performance of the vertical barrier backfill. The compound polymer modified bentonite anti-seepage barrier material can be mixed with clay to be used as a compacted clay layer in a horizontal barrier system, so that the anti-seepage performance of the barrier material is improved, and pollutants are prevented from infiltrating downwards; the composite polymer modified bentonite anti-seepage barrier material can be used as a raw material of a geosynthetic clay liner, and the anti-seepage performance and the migration retardation performance of the composite polymer modified bentonite anti-seepage barrier material are improved.
Detailed Description
The present invention will be described in detail with reference to specific examples.
In the in-situ soil of the vertical barrier, sand is the material with the largest permeability coefficient and the worst seepage-proofing effect, so the sand is selected as the in-situ soil in the test to verify the seepage-proofing and pollutant-intercepting performance of the invention under the most unfavorable condition at extreme.
The following materials used, sandy soil, were taken from the Yangtze river beach area of Nanjing, commercial sodium modified bentonite was produced from the Mufeng mineral processing plant in Zhenjiang city, and polyanionic cellulose (PAC) and Hydroxypropylmethylcellulose (HPMC) were both produced from Pujie trade company, Hunan.
Example 1
A compound polymer modified bentonite impermeable barrier material aiming at high-concentration compound pollutants is applied to vertical barrier backfill by an excavation backfill construction method.
The compound polymer modified bentonite anti-seepage barrier material comprises the following components in parts by mass: 94.4% of sodium modified bentonite, 4.9% of polyanionic cellulose (PAC) and 0.7% of hydroxypropyl methylcellulose (HPMC). In addition, the mass ratio of the compound polymer modified bentonite anti-seepage barrier material to the in-situ sand is 5.3: 44.7.
The preparation process comprises the following steps:
step 1), mixing sodium modified bentonite, polyanionic cellulose and hydroxypropyl methyl cellulose according to a mass ratio of 94.4: 4.9:0.7, adding the mixture into a dry powder stirrer, and stirring for 30min to prepare the compound polymer modified bentonite anti-seepage barrier material; wherein the rotating speed of the dry powder stirrer is 30 r/min;
and step 2) mixing the compound polymer modified bentonite anti-seepage barrier material with sandy soil and tap water according to the proportion, and controlling the slump of the backfill to be 125mm to prepare the compound polymer modified bentonite/sand backfill.
Example 2
A compound polymer modified bentonite impermeable barrier material aiming at high-concentration compound pollutants is applied to vertical barrier backfill by an excavation backfill construction method.
The compound polymer modified bentonite anti-seepage barrier material comprises the following components in parts by mass: 89.2% of sodium modified bentonite, 9.4% of polyanionic cellulose (PAC) and 1.4% of hydroxypropyl methylcellulose (HPMC). In addition, the mass ratio of the composite polymer modified bentonite barrier material to the in-situ sand is 1.4: 11.1.
The preparation process comprises the following steps:
step 1), mixing sodium modified bentonite, polyanionic cellulose and hydroxypropyl methyl cellulose according to a mass ratio of 89.2: 9.4:1.4, adding the mixture into a dry powder stirrer, and stirring for 30min to prepare the compound polymer modified bentonite anti-seepage barrier material; wherein the rotating speed of the dry powder stirrer is 30 r/min;
and 2) mixing the compound polymer modified bentonite anti-seepage barrier material with sandy soil and tap water according to the proportion, and controlling the slump of the backfill to be 125mm to prepare the compound polymer modified bentonite/sand backfill.
Example 3
A composite polymer modified bentonite impermeable barrier material aiming at high-concentration composite pollutants is applied to vertical barrier backfill by an excavation backfill construction method,
the compound polymer modified bentonite anti-seepage barrier material comprises the following components in parts by mass: 83.2% of sodium modified bentonite, 14.7% of polyanionic cellulose (PAC) and 2.1% of hydroxypropyl methylcellulose (HPMC). In addition, the mass ratio of the composite polymer modified bentonite barrier material to the in-situ sand is 3: 22.
The preparation process comprises the following steps:
step 1), mixing sodium modified bentonite, polyanionic cellulose and hydroxypropyl methyl cellulose according to a mass ratio of 83.2: 14.7:2.1, adding the mixture into a dry powder stirrer, and stirring for 30min to prepare the compound polymer modified bentonite anti-seepage barrier material; wherein the rotating speed of the dry powder stirrer is 30 r/min;
and 4) mixing the compound polymer modified bentonite anti-seepage barrier material with sandy soil and tap water according to the proportion, and controlling the slump of the backfill to be 125mm to prepare the compound polymer modified bentonite/sand backfill.
Comparative example
In order to more clearly show the advantages of the traditional non-modified bentonite material and various indexes of the high-concentration composite pollutant compound polymer modified bentonite anti-seepage barrier material, a traditional sand/bentonite backfill control case is set, the non-modified bentonite and the sand are mixed according to the mass ratio of 1:10, tap water is added in the mixing process, and the slump of the backfill is controlled to be 125mm, so that the traditional bentonite/sand backfill is prepared.
Test of
The following tests were conducted on the composite polymer modified bentonite barrier materials of examples 1 to 3 and the conventional bentonite materials of the comparative examples, respectively, wherein the same material as the original bentonite in the Zhenjiang city Mufeng was used, and the specific physical property indexes thereof are shown in Table 1:
test 1) free expansion test, according to ASTM D5890; the test results are shown in Table 2;
test 2) improved fluid loss test, the test standard is referred to national standard (GBT29170-2012), and the test adopts 20mmol/L high-concentration CaCl 2 The solution simulates the environment of salt solution and heavy metal salt solution, and is prepared by deionized water. The results of the improved fluid loss test under the action of this contaminated liquid are shown in table 3;
TABLE 1 physical Properties of Bentonite
TABLE 2 free swell test results
Table 3 improved fluid loss test results
In the in-situ soil of the vertical barrier, sand is the material with the largest permeability coefficient and the worst seepage-proofing effect, so the sand is selected as the backfill material in the test to verify the seepage-proofing and pollutant-cutting performance of the invention under the most unfavorable condition at extreme. The compounded polymer modified bentonite/sand backfill of examples 1-3 and the conventional unmodified bentonite/sand backfill of the comparative example were subjected to a flexible wall penetration test respectively, wherein the same raw materials of Zhenjiangfenfeng bentonite and Nanjing Changjiang river beach sand were used, and the specific physical chemical properties of the sand are shown in Table 4:
test 1) flexible wall penetration test, the test refers to ASTM D5084, and the test adopts domestic waste landfill leachate diluted by 50 times as a composite pollution solution. The chemical composition of the leachate from the original landfill is shown in table 5. The results of the flexible wall permeation test under the action of the landfill leachate are shown in table 6; furthermore, a high concentration of 40mmol/L of organic acid: the results of the flexible wall permeation test under the action of the acetic acid and oxalic acid solution simulating COD in the landfill leachate and the organic acid polluted liquid are shown in Table 7;
TABLE 4 basic physicochemical characteristics of sands
TABLE 5 landfill leachate chemistry composition
TABLE 6 penetration test results of flexible wall under the action of landfill leachate
TABLE 7 results of flexible wall permeation test under organic acid contaminant
The results of the above tests prove that compared with the traditional unmodified vertical barrier material, the composite polymer modified bentonite anti-seepage barrier material for high-concentration composite pollutants has the advantages of simple preparation method, wide application range and excellent characteristics of blocking high-concentration heavy metals, organic matters or composite pollutants.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (5)
1. The compound polymer modified bentonite anti-seepage barrier material is characterized by comprising the following components in parts by mass: 80-95% of sodium modified bentonite, 0.5-15% of polyanionic cellulose and 0.7-2.5% of hydroxypropyl methyl cellulose; the polyanionic cellulose and the hydroxypropyl methyl cellulose are compound polymers; the sodium modified bentonite belongs to high liquid limit montmorillonite clay, and is an aluminosilicate mineral mainly comprising montmorillonite minerals, wherein the particle size is less than 0.075mm, the liquid limit is more than 220%, and the free expansion rate is more than 16mL/2 g; the above-mentionedThe polyanionic cellulose is water-soluble cellulose ether prepared by chemically modifying natural cellulose, and has molecular weight of 10 4 -10 6 (ii) a The hydroxypropyl methyl cellulose belongs to nonionic cellulose mixed ether, the passing rate of a standard sieve with 100 meshes is more than 99 percent, and the molecular weight is 10 4 -10 6 。
2. The preparation method of the compound polymer modified bentonite barrier material based on claim 1 is characterized by comprising the following steps: sodium modified bentonite, polyanionic cellulose and hydroxypropyl methyl cellulose are mixed according to the mass ratio of 82.9:15: 2.1-94.4: 4.9:0.7, adding the mixture into a dry powder stirrer, and stirring at the speed of 14-38r/min for 10-60min to prepare the compound polymer modified bentonite anti-seepage barrier material.
3. Use of a compounded polymer modified bentonite barrier material prepared on the basis of claim 1 or claim 2 in a vertical barrier, a horizontal barrier system or a geosynthetic clay liner, wherein the vertical barrier, the horizontal barrier system or the geosynthetic clay liner is useful for blocking composite contaminants at a concentration of 20-500 mmol/L.
4. The use of claim 3, wherein the vertical barrier application is by excavation backfill, multi-axis deep agitation, high pressure jet, trench cutting deep agitation, or double wheel milling deep agitation.
5. The use according to claim 4, wherein the vertical barrier comprises a soil-bentonite vertical barrier, a soil-cement-bentonite series vertical barrier, a geomembrane-bentonite composite vertical barrier, a geomembrane-cement-bentonite series composite vertical barrier, or a bentonite waterproof blanket series vertical barrier.
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