CN110902751B - Permeable reactive barrier for underground pollutant migration control and underground pollutant migration control treatment method - Google Patents
Permeable reactive barrier for underground pollutant migration control and underground pollutant migration control treatment method Download PDFInfo
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
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- 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
- C02F2101/20—Heavy metals or heavy metal compounds
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- 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
Abstract
The invention discloses a permeable reactive barrier for controlling migration of underground pollutants and a method for controlling and treating migration of underground pollutants, belonging to the technical field of environmental pollution treatment. The permeable reactive barrier for controlling migration of underground pollutants comprises a permeable reactive layer, wherein the permeable reactive layer is mainly prepared from the following raw materials in parts by weight: 20-40 parts of quartz sand, 20-40 parts of activated carbon and 25-60 parts of iron powder; the granularity of the quartz sand is 32-100 meshes; the particle size of the iron powder is 0.050-10 mu m; the particle size of the active carbon is 0.9-2.2 mm. The permeable reactive material is prepared from a plurality of raw materials, and the permeable reactive material is further prepared into the permeable reactive wall, so that pollutants in the underground water body can be efficiently and fully adsorbed and treated, and the control effect of the permeable reactive wall on the migration of the pollutants in the water body is greatly improved.
Description
Technical Field
The invention relates to the technical field of environmental pollution treatment, in particular to a permeable reactive barrier for underground pollutant migration control and an underground pollutant migration control treatment method.
Background
The permeation barrier is mainly used for selectively blocking heavy metal ions, organic pollutant ions and the like through filling media in a Permeable Reactive Barrier (PRB).
PRB is a passive reaction zone filled with active reaction medium material, and when polluted underground water passes through, the pollutants and the reaction medium in the PRB are degraded, adsorbed, precipitated or removed through physical and chemical actions. Specifically, the PRB contains a redox agent, a chelating agent, a complexing agent, an adsorbent, a precipitator or microorganisms capable of removing pollutants, and when the pollutants pass through the PRB arranged in advance along with the water flow, the pollutants can be reduced, adsorbed, precipitated or biodegraded.
The permeable reactive barrier not only avoids the defects of long treatment time consumption, high engineering cost, large interference on a repair area, pollution rebound and the like in the traditional in-situ treatment technology, but also does not damage the body structure, does not occupy the ground treatment space, reduces the storage, transportation and recharging work and greatly reduces the cost compared with the ex-situ repair technology. The permeable reactive barrier technology in the prior art has low removal rate of heavy metals, and particularly after long-term use, the removal rate of the heavy metals is gradually reduced.
Disclosure of Invention
In view of the defects of the prior art, the first object of the present invention is to provide a permeable reactive barrier for controlling the migration of underground pollutants, so as to improve the removal rate of heavy metal pollutants.
The second purpose of the invention is to provide a method for controlling and treating the migration of underground pollutants, which has high removal rate of heavy metal pollutants by permeation and is simple and easy to operate.
In order to achieve the first object, the invention provides the following technical scheme:
the permeable reactive barrier for controlling the migration of underground pollutants comprises a permeable reactive layer, wherein the permeable reactive layer is mainly prepared from the following raw materials in parts by weight: 20-40 parts of quartz sand, 20-40 parts of activated carbon and 25-60 parts of iron powder; the granularity of the quartz sand is 32-100 meshes; the particle size of the iron powder is 0.050-10 μm; the particle size of the active carbon is 0.9-2.2 mm.
By adopting the technical scheme, the raw materials for preparing the permeable reaction layer of the permeable reaction wall comprise the activated carbon and the iron powder, and the particle size of the iron powder is controlled to be greatly smaller than that of the activated carbon, so that the iron powder can enter pores of the activated carbon and be adsorbed on the pore walls of the activated carbon. When groundwater passes through the infiltration reaction wall, the active carbon can adsorb the pollutant in the groundwater to the pore wall in the active carbon, and then reacts with the iron powder in the active carbon, degrades the pollutant, avoids the pollutant to pass the infiltration reaction wall and migrate, still recovers the adsorption performance of active carbon simultaneously. The particle size of quartz sand is between the particle size of active carbon and iron powder, can fill in the clearance of bigger granule such as active carbon, promotes permeable reaction material's closely knit degree, filters the water.
The invention is further configured to: the raw material also comprises 8-20 parts by weight of filler, wherein the filler is at least one of bentonite, perlite and attapulgite.
Through adopting above-mentioned technical scheme, bentonite can expand when meeting water, can further improve the closely knit degree of reverse osmosis wall, has prolonged the time that the water passes through the osmotic reaction wall, improves the filter effect to pollutant in the water. The perlite has good water absorption, further improves the time of water body passing through the permeable reactive barrier, and can also improve the wettability among the raw materials when preparing the reverse osmosis material, thus facilitating granulation. The attapulgite clay has certain water absorbability and viscosity, can prolong the water passing time, can improve the viscosity of the mixed raw materials, and is convenient for granulation.
The invention is further configured to: the filler consists of bentonite, perlite and silicon-magnesia in a mass ratio of (1-1.5) to (5-8) to (3-5).
By adopting the technical scheme, in order to ensure that the activated carbon can efficiently adsorb pollutants in water, the addition amount of the filler is not too large, and in order to ensure that each filler can exert better effect, the proportion of bentonite, perlite and attapulgite is optimized, the bentonite, the perlite and the attapulgite are matched with each other, and the processability for preparing the permeable reactive material is improved on the basis of prolonging the water passing time to the greatest extent. .
The invention is further configured to: the raw materials also comprise 3-8 parts by weight of lime and 10-15 parts by weight of gypsum.
By adopting the technical scheme, when the permeable reactive material is prepared, the raw materials can be firmly combined together by utilizing the gypsum and the water, so that the granular material is convenient to form.
The invention is further configured to: the raw material also comprises 5-10 parts by weight of zeolite.
By adopting the technical scheme, the zeolite can replace part of active carbon to adsorb pollutants in a water body, and the particles fully adsorb the pollutants by utilizing the stronger water wettability of the zeolite.
The invention is further configured to: the raw materials also comprise 10-15 parts by weight of high molecular polymer, wherein the high molecular polymer is at least one of polypropylene, polyacrylonitrile, polyethylene oxide, ethylene-ethyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-butyl acrylate copolymer.
By adopting the technical scheme, the added high molecular polymer can directly adsorb partial organic pollutants, and the range of controlling the migration of water pollutants is improved.
The invention is further configured to: the high molecular polymer comprises a homopolymerization material and a copolymerization material, wherein the homopolymerization material is at least one of polypropylene, polyacrylonitrile and polyethylene oxide, and the copolymerization material is at least one of ethylene-ethyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer and ethylene-butyl acrylate copolymer.
By adopting the technical scheme, homopolymerization materials and copolymerization materials with different configurations can adsorb various organic pollutants, so that the adsorption efficiency is improved.
The invention is further configured to: the raw materials also comprise 15-20 parts by weight of reinforcing metal, wherein the reinforcing metal is at least one of aluminum powder, magnesium powder and zinc powder.
By adopting the technical scheme, the reaction effect of single iron powder is changed by adding the reinforced metal, the iron powder can be supplemented, and the reaction sufficiency is improved.
In order to achieve the second object, the invention provides the following technical scheme:
a method for controlling and treating the migration of underground pollutants comprises the following steps:
1) after uniformly mixing the activated carbon and the iron powder, adding quartz sand and uniformly mixing to prepare a permeable reactive material;
2) and excavating a groove in the field to be treated, and filling permeable reactive materials in the groove to form a permeable reactive barrier.
By adopting the technical scheme, the method provided by the invention can effectively block the migration of pollutants and realize the control of the pollutants by digging the groove in the polluted site to be treated and preparing the permeable reactive barrier.
The invention is further configured to: step 1) uniformly mixing the activated carbon and the iron powder, adding quicklime, gypsum and water, uniformly mixing to obtain a granular material, and then uniformly mixing the granular material and quartz sand to obtain the permeable reactive material.
Through adopting above-mentioned technical scheme, mix the back with the iron powder earlier active carbon, during the iron powder of tiny granule can get into the hole of active carbon, when preparing into the infiltration reaction wall, reacts the absorbent pollutant of active carbon, has improved reaction efficiency, falls the back with the absorbent pollutant reaction of active carbon moreover, has also carried out the adsorption efficiency with the active carbon and has resumeed, has improved the life of infiltration reaction wall.
In conclusion, the invention has the following beneficial effects:
the permeable reactive material is prepared from a plurality of raw materials, and the permeable reactive material is further prepared into the permeable reactive wall, so that pollutants in the underground water body can be efficiently and fully adsorbed and treated, and the control effect of the permeable reactive wall on the migration of the pollutants in the water body is greatly improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
The permeable reactive barrier for controlling migration of underground pollutants is used for controlling migration of Cr pollutants. In the raw materials for preparing the permeable reactive material used for the permeable reactive barrier for controlling the migration of underground pollutants, the sum of the weight of iron powder and zinc powder is 40-60 parts. The mass ratio of the iron powder to the reinforcing metal is (1-2) to 1. Preferably, the reinforcing metal is magnesium powder or zinc powder and aluminum powder, and the weight ratio of (2-3): 1 by mass ratio. The particle size of the reinforcing metal is preferably 325-1100 mesh. The aluminum powder and the magnesium powder can adopt aluminum alloy scraps and magnesium alloy scraps in mechanical processing so as to realize the utilization of waste resources. The iron powder and the reinforced metal are sprayed with 9.8 mass percent dilute sulfuric acid before use and then washed with water to remove impurities and oxide films on the surface of the iron powder so as to improve the activity of the iron powder and the reinforced metal.
The granularity of the bentonite is 100-200 meshes. The granularity of the perlite is 90-100 meshes. The particle size of the homopolymerization material is 1-2 mm. The grain diameter of the copolymerization material is 2-4 mm.
In the method for controlling and treating the migration of the underground pollutants, the activated carbon and the iron powder are uniformly mixed and stirred for 10-30min at the rotating speed of 50-80 r/min. After the quartz sand is added, the mixture is evenly mixed and stirred for 10-20min at the rotating speed of 100-150 r/min.
Example 1
The infiltration reaction wall for underground pollutant migration control of this embodiment includes filter screen, metalling, filter screen, sand bed, filter screen, permeable reaction layer, filter screen, sand bed, filter screen, metalling, filter screen that set gradually along groundwater flow direction. The thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reaction layer is 50 cm. The filter screen comprises a filter screen framework and polyethylene nets fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework composed of longitudinal ribs and transverse ribs. The mesh size of the polyethylene net is 1 mm. The crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm. The sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm.
The permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 40 parts of quartz sand, 20 parts of activated carbon and 40 parts of iron powder; the granularity of the quartz sand is 40 meshes; the particle size of the iron powder is 5 mu m; the particle size of the activated carbon was 1.5 mm.
The underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon and iron powder into a stirrer, stirring at the rotating speed of 80r/min for 20min, then adding quartz sand, and stirring at the rotating speed of 150r/min for 10min to prepare the permeable reactive material.
2) A groove is dug in a place where a permeable reactive wall needs to be arranged, then a plurality of layers of filter screens are vertically and fixedly arranged, and then broken stones, natural sand and permeable reactive materials are respectively filled in a plurality of gaps among the filter screens.
Example 2
The infiltration reaction wall for underground pollutant migration control of this embodiment includes filter screen, metalling, filter screen, sand bed, filter screen, permeable reaction layer, filter screen, sand bed, filter screen, metalling, filter screen that set gradually along groundwater flow direction. The thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reaction layer is 50 cm. The filter screen comprises a filter screen framework and polyethylene nets fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework composed of longitudinal ribs and transverse ribs. The mesh size of the polyethylene net is 1 mm. The crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm. The sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm.
The permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 20 parts of quartz sand, 40 parts of activated carbon, 55 parts of iron powder, 5 parts of quicklime and 10 parts of gypsum; the granularity of the quartz sand is 70 meshes; the particle size of the iron powder is 10 mu m; the particle size of the activated carbon was 0.9 mm.
The underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon and iron powder into a stirrer, stirring at a rotating speed of 50r/min for 30min, then adding quicklime and gypsum, stirring at a rotating speed of 50r/min for 10min, adding 10 parts of water, stirring at a rotating speed of 50r/min for 10min to obtain a granular material, then adding quartz sand, and stirring at a rotating speed of 100r/min for 20min to obtain the permeable reactive material.
2) A groove is dug in a place where a permeable reactive wall needs to be arranged, then a plurality of layers of filter screens are vertically and fixedly arranged, and then broken stones, natural sand and permeable reactive materials are respectively filled in a plurality of gaps among the filter screens.
Example 3
The infiltration reaction wall for underground pollutant migration control of this embodiment includes filter screen, metalling, filter screen, sand bed, filter screen, permeable reaction layer, filter screen, sand bed, filter screen, metalling, filter screen that set gradually along groundwater flow direction. The thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reaction layer is 50 cm. The filter screen comprises a filter screen framework and polyethylene nets fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework composed of longitudinal ribs and transverse ribs. The mesh size of the polyethylene net is 1 mm. The crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm. The sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm.
The permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 15 parts of quartz sand, 45 parts of activated carbon, 25 parts of iron powder, 15 parts of aluminum powder, 5 parts of bentonite, 5 parts of perlite, 3 parts of quicklime, 15 parts of gypsum and 10 parts of polypropylene particles; the granularity of the quartz sand is 100 meshes; the particle size of the active carbon is 2.2 mm; the particle size of the iron powder is 1 mu m; the granularity of the aluminum powder is 325 meshes; the granularity of the bentonite is 200 meshes; the granularity of the perlite is 90 meshes; the polypropylene particles had an average particle size of 1 mm.
The underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon, iron powder and aluminum powder into a stirrer, stirring for 30min at the rotating speed of 50r/min, then adding quicklime, gypsum, bentonite and perlite, stirring for 10min at the rotating speed of 50r/min, adding 10 parts of water, stirring for 10min at the rotating speed of 50r/min to obtain a granular material, then adding quartz sand and polypropylene granules, stirring for 20min at the rotating speed of 100r/min to obtain the permeable reactive material.
2) A groove is dug in a place where a permeable reactive wall needs to be arranged, then a plurality of layers of filter screens are vertically and fixedly arranged, and then broken stones, natural sand and permeable reactive materials are respectively filled in a plurality of gaps among the filter screens.
Example 4
The infiltration reaction wall for underground pollutant migration control of this embodiment includes filter screen, metalling, filter screen, sand bed, filter screen, permeable reaction layer, filter screen, sand bed, filter screen, metalling, filter screen that set gradually along groundwater flow direction. The thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reaction layer is 50 cm. The filter screen comprises a filter screen framework and polyethylene nets fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework composed of longitudinal ribs and transverse ribs. The mesh size of the polyethylene net is 1 mm. The crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm. The sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm.
The permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 10 parts of quartz sand, 50 parts of activated carbon, 30 parts of iron powder, 20 parts of aluminum powder, 1 part of bentonite, 5 parts of perlite, 3 parts of attapulgite, 3 parts of quicklime, 15 parts of gypsum, 8 parts of zeolite, 6 parts of polypropylene particles and 9 parts of EVA; the granularity of the quartz sand is 70 meshes; the particle size of the active carbon is 0.9 mm; the particle size of the iron powder is 10 mu m; the granularity of the aluminum powder is 325 meshes; the granularity of the bentonite is 200 meshes; the granularity of the perlite is 90 meshes; the average particle diameter of the polypropylene particles was 1mm, and the average particle diameter of the EVA was 2 mm.
The underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon, zeolite, iron powder and aluminum powder into a stirrer, stirring for 30min at the rotating speed of 50r/min, then adding quicklime, gypsum, bentonite, perlite and attapulgite, stirring for 15min at the rotating speed of 80r/min, adding 10 parts of water, stirring for 10min at the rotating speed of 50r/min to obtain a granular material, then adding quartz sand, polypropylene particles and EVA, stirring for 20min at the rotating speed of 100r/min to obtain the permeable reactive material.
2) Digging grooves in a field needing to be provided with the permeable reactive barrier, vertically and fixedly arranging a plurality of layers of filter screens, respectively filling broken stones, natural sand and permeable reactive materials in a plurality of gaps among the filter screens, and filling soil to bury.
Example 5
The infiltration reaction wall for underground pollutant migration control of this embodiment includes filter screen, metalling, filter screen, sand bed, filter screen, permeable reaction layer, filter screen, sand bed, filter screen, metalling, filter screen that set gradually along groundwater flow direction. The thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reactive layer is 50 cm. The filter screen comprises a filter screen framework and polyethylene nets fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework composed of longitudinal ribs and transverse ribs. The mesh size of the polyethylene net is 1 mm. The crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm. The sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm.
The permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 20 parts of quartz sand, 35 parts of activated carbon, 30 parts of iron powder, 15 parts of aluminum powder, 5 parts of magnesium powder, 2 parts of bentonite, 10 parts of perlite, 6 parts of attapulgite, 5 parts of quicklime, 10 parts of gypsum, 5 parts of zeolite, 3 parts of polypropylene particles and 8 parts of EVA; the granularity of the quartz sand is 70 meshes; the particle size of the active carbon is 0.9 mm; the particle size of the iron powder is 10 mu m; the granularity of the aluminum powder is 325 meshes; the granularity of the magnesium powder is 800 meshes; the granularity of the bentonite is 200 meshes; the granularity of the perlite is 90 meshes; the average particle size of the polypropylene particles was 1mm, and the average particle size of the EVA particles was 2 mm.
The underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon, zeolite, iron powder and aluminum powder into a stirrer, stirring for 30min at the rotating speed of 60r/min, then adding quicklime, gypsum, bentonite, perlite and attapulgite, stirring for 15min at the rotating speed of 90r/min, adding 10 parts of water, stirring for 15min at the rotating speed of 50r/min to obtain a granular material, then adding quartz sand, polypropylene particles and EVA, stirring for 10min at the rotating speed of 150r/min to obtain the permeable reactive material.
2) Digging grooves in a field needing to be provided with the permeable reactive barrier, vertically and fixedly arranging a plurality of layers of filter screens, respectively filling broken stones, natural sand and permeable reactive materials in a plurality of gaps among the filter screens, and filling soil to bury.
Example 6
The infiltration reaction wall for underground pollutant migration control of this embodiment includes filter screen, metalling, filter screen, sand bed, filter screen, permeable reaction layer, filter screen, sand bed, filter screen, metalling, filter screen that set gradually along groundwater flow direction. The thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reaction layer is 50 cm. The filter screen comprises a filter screen framework and polyethylene nets fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework formed by longitudinal ribs and transverse ribs. The mesh size of the polyethylene net is 1 mm. The crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm. The sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm.
The permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 20 parts of quartz sand, 35 parts of activated carbon, 20 parts of iron powder, 15 parts of aluminum powder, 5 parts of zinc powder, 2 parts of bentonite, 8 parts of perlite, 5 parts of attapulgite, 8 parts of quicklime, 12 parts of gypsum, 10 parts of zeolite, 5 parts of polypropylene particles and 10 parts of EVA; the granularity of the quartz sand is 70 meshes; the particle size of the active carbon is 0.9 mm; the particle size of the iron powder is 10 mu m; the granularity of the aluminum powder is 325 meshes; the granularity of the zinc powder is 1100 meshes; the granularity of the bentonite is 200 meshes; the granularity of the perlite is 90 meshes; the average particle diameter of the polypropylene particles was 1mm, and the average particle diameter of the EVA was 2 mm.
The underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon, zeolite, iron powder, aluminum powder and zinc powder into a stirrer, stirring for 30min at the rotating speed of 60r/min, then adding quicklime, gypsum, bentonite, perlite and attapulgite, stirring for 15min at the rotating speed of 90r/min, adding 10 parts of water, stirring for 15min at the rotating speed of 50r/min to obtain a granular material, then adding quartz sand, polypropylene particles and EVA, and stirring for 15min at the rotating speed of 120r/min to obtain the permeable reaction material.
2) Digging grooves in a field needing to be provided with the permeable reactive barrier, vertically and fixedly arranging a plurality of layers of filter screens, respectively filling broken stones, natural sand and permeable reactive materials in a plurality of gaps among the filter screens, and filling soil to bury.
Comparative example 1
The permeable reactive layer in this comparative example was formed by mixing a permeable reactive material consisting of 60 parts by weight of quartz sand and 40 parts by weight of activated carbon.
Comparative example 2
The permeable reactive layer in this comparative example was formed by mixing a permeable reactive material of 40 parts by weight of quartz sand and 60 parts by weight of iron powder.
Test examples
The permeable reactive materials of examples 1 to 6 and comparative example were tested as follows.
The simulated polluted underground water is prepared by distilled water and potassium dichromate, wherein the mass solubility of Cr (VI) is 100mg/L, and the pH value of the simulated polluted underground water is 6.2-6.8, which is close to the pH value of actual underground water.
The test is carried out by adopting a penetration test device which comprises a Marshall flask, the water outlet of the Marshall flask is connected with an organic glass tube (the tube length is 500mm, and the inner diameter is 50mm) through a rubber tube, the organic glass tube is vertically arranged, the upper end and the lower end of the organic glass tube are sealed by rubber plugs, and the rubber tube connected with the Marshall flask is arranged in the rubber plug at the lower end through a short glass tube. The upper end of the organic glass tube is provided with a short glass tube in a penetrating way and is connected with a measuring cylinder through a rubber tube. The bottom of the March's flask is higher than the water outlet at the upper end of the organic glass tube, a vertically arranged long glass tube is arranged on the plug of the bottle mouth of the March's flask in a penetrating manner, and the opening at the lower end of the long glass tube is also higher than the water outlet at the upper end of the organic glass tube. The rubber plugs at the two ends of the organic glass tube are internally padded with filter screens, and a quartz sand layer, a permeable reactive material layer and a quartz sand layer are sequentially filled between the filter screens at the two ends.
Simulated polluted underground water is filled in the Mariotte bottle, a fixed water head difference delta h is kept between the lower end opening of the long glass tube in the bottle and the upper end water outlet of the organic glass tube, and the seepage speed of water is controlled to be 60-80 cm/d. Sampling is carried out at a water outlet every day, and the Cr (VI) content and the pH value are detected and analyzed. The measurement results after one week of operation are shown in the following table.
TABLE 1 simulation of contaminated groundwater infiltration test results
As can be seen from the table above, the permeable reactive material of the invention has very good degradation effect on Cr (VI) pollution, the removal rate can reach more than 99 percent, and when the permeable reactive material is used as a permeable reactive wall, the permeable reactive material can well control the migration of polluted underground water and has better treatment effect on a polluted site.
Claims (1)
1. An underground pollutant migration control and treatment method using a permeable reactive barrier for underground pollutant migration control is characterized in that: the permeable reactive barrier for controlling the migration of underground pollutants comprises a filter screen, a gravel layer, a filter screen, a sand layer, a filter screen, a permeable reactive layer, a filter screen, a sand layer, a filter screen, a gravel layer and a filter screen which are sequentially arranged along the direction of underground water flow; the thickness of the crushed stone layer is 20cm, the thickness of the sand layer is 10cm, and the thickness of the permeable reaction layer is 50 cm; the filter screen comprises a filter screen framework and polyethylene screens fixedly arranged on two sides of the filter screen framework, and the filter screen framework is a framework formed by longitudinal ribs and transverse ribs; the mesh size of the polyethylene net is 1 mm; the crushed stone layer is composed of crushed stones with the grain diameter of 4.75-9.50 mm; the sand layer is composed of natural sand with the grain diameter of 1.18-2.36 mm;
the permeable reactive layer is formed by filling permeable reactive materials, and the permeable reactive materials are prepared from the following raw materials in parts by weight: 20 parts of quartz sand, 35 parts of activated carbon, 20 parts of iron powder, 15 parts of aluminum powder, 5 parts of zinc powder, 2 parts of bentonite, 8 parts of perlite, 5 parts of attapulgite, 8 parts of quicklime, 12 parts of gypsum, 10 parts of zeolite, 5 parts of polypropylene particles and 10 parts of EVA; the granularity of the quartz sand is 70 meshes;
the particle size of the active carbon is 0.9 mm; the particle size of the iron powder is 10 mu m; the granularity of the aluminum powder is 325 meshes; the granularity of the zinc powder is 1100 meshes; the granularity of the bentonite is 200 meshes; the granularity of the perlite is 90 meshes; the average particle size of the polypropylene particles is 1mm, and the average particle size of the EVA particles is 2 mm;
the underground pollutant migration control treatment method comprises the following steps:
1) adding activated carbon, zeolite, iron powder, aluminum powder and zinc powder into a stirrer, stirring for 30min at the rotating speed of 60r/min, then adding quicklime, gypsum, bentonite, perlite and attapulgite, stirring for 15min at the rotating speed of 90r/min, adding 10 parts of water, stirring for 15min at the rotating speed of 50r/min to obtain a granular material, then adding quartz sand, polypropylene particles and EVA, and stirring for 15min at the rotating speed of 120r/min to obtain a permeable reaction material;
2) digging grooves in a field needing to be provided with the permeable reactive barrier, vertically and fixedly arranging a plurality of layers of filter screens, respectively filling broken stones, natural sand and permeable reactive materials in a plurality of gaps among the filter screens, and filling soil to bury.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911304960.6A CN110902751B (en) | 2019-12-17 | 2019-12-17 | Permeable reactive barrier for underground pollutant migration control and underground pollutant migration control treatment method |
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