CN211198834U - Vertical multistage permeable reactive barrier - Google Patents
Vertical multistage permeable reactive barrier Download PDFInfo
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- CN211198834U CN211198834U CN201921113026.1U CN201921113026U CN211198834U CN 211198834 U CN211198834 U CN 211198834U CN 201921113026 U CN201921113026 U CN 201921113026U CN 211198834 U CN211198834 U CN 211198834U
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Abstract
The utility model discloses a vertical multistage permeable reactive barrier, which comprises a first impervious wall, a second impervious wall and a reactive wall body, wherein the first impervious wall and the second impervious wall are respectively arranged at two sides of the reactive wall body; the reaction wall body includes from last apron, upper strata that sets gradually down sand layer, the one-level reaction unit, the second grade reaction unit and the lower floor sand layer that permeates water. The utility model has the characteristics of low in construction cost, maintain simple, can handle multiple pollution component, comprehensive treatment efficiency height, shortcoming such as construction cost is high, engineering excavation volume is big when having improved traditional permeable reactive barrier and handling multicomponent combined pollution, can quick replacement reaction medium in the operation is maintained, easy operation has reduced the maintenance cost, is favorable to this normal position repair technique's popularization.
Description
Technical Field
The utility model relates to a pollute place groundwater pollution restoration prevention and cure technical field, especially relate to a vertical multistage permeable reaction wall.
Background
Permeable Reactive Barrier (PRB) technology is a pollution remediation technology for in situ remediation of groundwater. The technology intercepts contaminant plumes by installing active material walls underground. After the contaminated plume passes through the reaction medium, its contaminants are converted to another form that is environmentally acceptable, thereby achieving the goal of achieving a contaminant concentration that meets environmental standards. The PRB is composed of a permeable reaction medium, is usually arranged at the downstream of the underground water pollution plume, and when the polluted underground water passes through the PRB, the pollutants in the water body are removed by the actions of precipitation, adsorption, oxidation reduction and the like, so that clean underground water is obtained. Can remove organic matters, metals, radioactive substances and other pollutants dissolved in underground water.
The PRB technology is an important method for remedying the underground water pollution internationally at present, and has the advantages of continuous in-situ pollutant treatment, good treatment effect, convenience in installation and construction, high cost performance and the like. But the following disadvantages are present at the same time: (1) the method is only suitable for the area with smaller thickness of the aquifer, and for the conditions of large thickness of the aquifer and wide pollution range, the construction cost of the PRB construction project is obviously increased. (2) During the operation of the system, the porosity of the reaction wall is reduced due to the precipitation of reaction product precipitates, the permeability coefficient is increased, and the blockage can be caused, so that the filler needs to be replaced and the system needs to be maintained regularly. (3) When groundwater is simultaneously polluted by multiple component pollutants, traditional PRB cannot be effectively treated at the same time; and if two layers or even multiple layers of PRBs are established in series, the engineering quantity and the repair cost are greatly increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the vertical multistage permeable reactive barrier is provided to solve the problems of high construction cost, high maintenance cost, complex filler replacement operation and the like when multi-component pollutants are treated in the conventional permeable reactive barrier technology.
In order to realize the purpose of the utility model, the utility model discloses a technical scheme as follows:
a vertical multistage permeable reactive barrier comprises a first impervious wall, a second impervious wall and a reactive barrier wall body, wherein the first impervious wall and the second impervious wall are respectively arranged on two sides of the reactive barrier wall body; the reaction wall body includes from last apron, upper strata that sets gradually down sand layer, the one-level reaction unit, the second grade reaction unit and the lower floor sand layer that permeates water.
Preferably, the waterproof curtain is arranged on the upstream of the reaction wall body, and the underground water monitoring well is arranged on the downstream of the reaction wall body.
The permeability coefficient of each layer is required to be more than 2 times greater than that of the aquifer where the layer is located, and the lowest permeability coefficient is not lower than 1.2 × 10-4cm/s, the main components of the upper permeable sand layer and the lower permeable sand layer are quartz sand filter materials, the permeability coefficients of the upper permeable sand layer and the lower permeable sand layer are greater than those of the first-stage reaction unit and the second-stage reaction unit, the layers mainly play roles of filtering and buffering underground water, and the maximum treatment capacity and the service life of the reaction units are guaranteed.
Preferably, the first impervious wall is arranged on one side of the upstream of the wall body of the reaction wall, the bottom end of the first impervious wall is embedded into the water-proof layer, and the top end of the first impervious wall is flush with or slightly higher than the top end of the first-stage reaction unit.
Preferably, the second impervious wall is arranged on the downstream side of the reaction wall body, the bottom end of the second impervious wall is flush with or slightly lower than the bottom end of the secondary reaction unit, and the top end of the second impervious wall is flush with or slightly lower than the ground but higher than the highest groundwater level. Ensuring that the groundwater is guided to flow through the whole structure from top to bottom.
Preferably, the thickness of the first impervious wall is 0.2-0.5m, the depth of the bottom end of the first impervious wall embedded into the water-resisting layer is 0.5-1m, the thickness of the second impervious wall is 0.2-0.5m, and the first impervious wall and the second impervious wall are made of common concrete, reinforced concrete with few ribs or plastic concrete.
Preferably, first order reaction unit and second order reaction unit include bearing structure, geotechnological composite drainage network, meet water inflation layer and reaction medium, bearing structure is hexahedron, geotechnological composite drainage network sets up the upper and lower two sides at bearing structure, meet water inflation layer setting around bearing structure, reaction medium sets up in bearing structure.
Preferably, the cross section of the support structure is a parallelogram, and the long side and the horizontal plane of the support structure form an included angle of 10-30 degrees and are embedded between the first impervious wall and the second impervious wall, so that the reaction unit is arranged perpendicular to the water flow direction, and the reaction unit and pollutants are fully reacted.
Preferably, the reaction medium filled in the first-stage reaction unit is zero-valent iron powder or a mixture of the zero-valent iron powder and quartz sand, and the mixing ratio is 1-5: 2, the particle size of the iron powder is less than 0.25mm, the particle size of the quartz sand is 0.5-1.0mm, and the comprehensive particle size ensures that the permeability coefficient of the medium is more than 2 times of the permeability coefficient of the aquifer.
Preferably, the reaction medium filled in the secondary reaction unit is one or more of activated carbon, modified zeolite, straw, sawdust, compost and coated bimetallic material. The comprehensive permeability coefficient of the composite material is more than 2 times of the permeability coefficient of an aquifer, and the composite material is mainly used for assisting in treating pollutants which are difficult to treat in a first-stage reaction unit, such as phenol and the like, and adsorbing residual unreacted pollutants.
Preferably, the waterproof curtains are symmetrically arranged, one end of each waterproof curtain is connected with the wall of the reaction wall, and the other end of each waterproof curtain faces the upstream direction of the wall of the reaction wall. The waterproof curtain needs to cover the whole pollution plume range and can be used for guiding polluted underground water to flow to the permeable reactive wall.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
(1) the utility model provides a permeable reactive barrier and construction method for groundwater normal position restores multicomponent pollutant establishes the means of establishing the continuous wall in series when restoreing multicomponent pollutant for traditional PRB technique, the utility model discloses to handle the fine combination of reaction medium that multicomponent pollutes in same PRB wall body, the construction work volume that has significantly reduced, and then reduced the input of restoration fund. Meanwhile, the operation of replacing the filler in the system maintenance process can be simplified by arranging the first-stage reaction unit and the second-stage reaction unit, and the rapid dredging when the zero-valent iron is blocked can be realized by the layered design of the permeable sand layer and the reaction units, so that the maintenance cost is reduced.
(2) The utility model has the characteristics of low in construction cost, maintain simple, can handle multiple pollution component, comprehensive treatment efficiency height, shortcoming such as construction cost is high, engineering excavation volume is big when having improved traditional permeable reactive barrier and handling multicomponent combined pollution, can quick replacement reaction medium in the operation is maintained, easy operation has reduced the maintenance cost, is favorable to this normal position repair technique's popularization.
Drawings
FIG. 1 is a top view of a vertical multistage permeable reactive barrier of the present invention;
FIG. 2 is a sectional view of a vertical multistage permeable reactive barrier according to the present invention;
FIG. 3 is an exploded view of the first or second reaction unit of the present invention;
fig. 4 is a flow chart of the construction of a vertical multistage permeable reactive barrier of the present invention.
Wherein, 1-a reaction wall body; 2-waterproof curtain; 3-a first impervious wall; 4-a second cut-off wall; 5-underground water monitoring well; 6-a first-stage reaction unit; 7-a secondary reaction unit; 8-upper permeable sand layer; 9-lower permeable sand layer; 10-a cover plate; 11-a reaction medium; 12-a support structure; 13-geotechnical composite drainage net; 14-water swellable layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description will be given of preferred embodiments and further detailed description of the present invention. It should be understood, however, that the numerous specific details set forth in the specification are merely set forth to provide a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in fig. 1-3, the vertical multistage permeable reactive barrier of the present invention comprises a waterproof curtain 2, a first impervious wall 3, a second impervious wall 4, a reactive wall body 1 and a groundwater monitoring well 5, wherein the waterproof curtain 2 is disposed at the upstream of the reactive wall body 1, the groundwater monitoring well 5 is disposed at the downstream of the reactive wall body 1, and the first impervious wall 3 and the second impervious wall 4 are respectively disposed at two sides of the reactive wall body 1; the reaction wall body 1 comprises a cover plate 10, an upper permeable sand layer 8, a first-stage reaction unit 6, a second-stage reaction unit 7 and a lower permeable sand layer 9 which are sequentially arranged from top to bottom; the permeability coefficient of each layer is 2 times larger than that of the aquiferAbove, and at least not less than 1.2 × 10-4cm/s; a first impervious wall 3 is arranged on one side of the reaction wall body 1 close to the pollution feather, and a second impervious wall 4 is arranged on one side close to the underground water monitoring well 5.
The first impervious wall 3 of the utility model is arranged at one side of the upstream of the reaction wall body 1, the bottom end of the first impervious wall 3 is embedded into the water-proof layer, and the top end of the first impervious wall 3 is flush with or slightly higher than the top end of the first-level reaction unit 6; the thickness of the first impervious wall 3 is 0.2-0.5m, the wall material is mainly ordinary concrete, reinforced concrete with few ribs or plastic concrete, the depth of the waterproof layer embedded at the bottom end is 0.5-1m, and the top end is flush with or slightly higher than the top end of the first-stage reaction unit 6.
The second impervious wall 4 of the utility model is arranged at one side of the downstream of the reaction wall body 1, the bottom end of the second impervious wall 4 is flush with the bottom end of the second-stage reaction unit 7, and the top end of the second impervious wall 4 is flush with the ground or slightly higher, so that the groundwater is guided to flow through the whole structure from top to bottom; the thickness of the second impervious wall 4 is 0.2-0.5m, the wall material is mainly ordinary concrete, reinforced concrete with few ribs or plastic concrete, the bottom end of the second impervious wall is flush with or slightly lower than the bottom end of the second-stage reaction unit 7, and the top end of the second impervious wall is flush with or slightly lower than the ground.
The upper sand layer 8 that permeates water, the lower floor 9 principal ingredients that permeates water of sand layer are the quartz sand filter material, and its osmotic coefficient is greater than the osmotic coefficient of one-level reaction unit 6, second grade reaction unit 7.
Apron 10 covers in 1 tops of reaction wall body, mainly used avoids system operation in-process atmosphere precipitation and considers the interference of factor to the structure.
First-order reaction unit 6 and second grade reaction unit 7 all include bearing structure 12, geotechnological composite drainage network 13, meet water inflation layer 14 and reaction medium 11, first-order reaction unit 6 and second grade reaction unit 7 include bearing structure 12, geotechnological composite drainage network 13, meet water inflation layer 14 and reaction medium 11, bearing structure 12 is hexahedron, geotechnological composite drainage network 13 sets up the upper and lower two sides at bearing structure 12, meet water inflation layer 14 setting around bearing structure 12, reaction medium 11 sets up in bearing structure 12. Set up the bagged reaction medium 11 of different grade type in bearing structure 12 respectively, bearing structure 12 is upper and lower face installation geotechnological composite drainage network 13, and water swelling layer 14 is installed on peripheral four sides. The cross section of the supporting structure 12 is a parallelogram, the long side of the supporting structure and the horizontal plane form an included angle of 10-30 degrees and the supporting structure is embedded between the impervious walls, so that the reaction unit is arranged perpendicular to the water flow direction, and the reaction unit and pollutants are fully reacted.
The first-stage reaction unit 6 of the utility model is filled with reaction media 11 which are mainly zero-valent iron or a mixture of zero-valent iron and quartz sand, and the comprehensive particle size ensures that the permeability coefficient of the media is more than 2 times of the permeability coefficient of the aquifer; the filling reaction medium 11 of the second-stage reaction unit 7 mainly comprises active carbon, modified zeolite, straws, sawdust, compost, coated bimetallic materials and the like, and the permeability coefficient of the filling reaction medium is more than 2 times that of the filling reaction medium of the second-stage reaction unit. The method is mainly used for auxiliary treatment of pollutants which are difficult to treat in the first-stage reaction unit 6, such as phenol and the like, and simultaneously adsorbing residual unreacted pollutants.
Implement the utility model relates to a construction method of vertical multistage permeable reactive barrier, including following step:
(1) arranging a vertical waterproof curtain surrounding the pollution feathers according to the site condition, and arranging a plurality of opening areas at proper positions downstream;
(2) digging a groove in the reserved opening area, constructing and pouring a first impervious wall and a second impervious wall, embedding a water-proof layer for 0.5-1m at the bottom end of the first impervious wall, and enabling the top end to be level with or slightly higher than the top end of the first-stage reaction unit; the bottom end of the second impervious wall is flush with or slightly lower than the bottom end of the second-stage reaction unit, and the top end of the second impervious wall is flush with or slightly lower than the ground but higher than the highest water level of underground water;
(3) according to the pollution condition, corresponding bagged reaction media are respectively filled in the supporting structures of the first-stage reaction unit and the second-stage reaction unit so as to ensure the maximum pollution treatment efficiency;
(4) the upper surface and the lower surface of the first-stage reaction unit and the second-stage reaction unit are respectively bonded with a geotechnical composite drainage net, and the four side surfaces are bonded with water-swelling layers, so that the reaction units can be hermetically embedded with the connected impervious wall and the waterproof curtain;
(5) sequentially laying a lower permeable sand layer, a secondary reaction unit, a primary reaction unit and an upper permeable sand layer in layers in the excavated groove, and continuously laying the layers to form a wall;
(6) a cover plate is added on the top of the wall body;
(7) and arranging a groundwater monitoring well at the exposed side of the clean groundwater.
The following are examples of the application of the present invention:
application example 1:
the landfill leachate causes groundwater water quality pollution, and the landfill leachate is usually compound pollution caused by a plurality of component pollutants. Through detection, the pollution concentration of a polluted water sample after the landfill leachate flows through the aquifer is as follows: CODcr955mg/L，NH3-N105.5mg/L. the vertical multistage permeable reactive barrier and the construction method of the utility model are adopted for repairing, the construction method is as follows:
(1) a vertical water-stop curtain covering the whole pollution plume is arranged, and a plurality of opening areas are arranged at proper positions downstream.
(2) Digging a groove in the reserved opening area, constructing and pouring a first impervious wall and a second impervious wall, wherein the thickness of the first impervious wall is 0.5m, the wall material is reinforced concrete with few ribs, the bottom end of the wall material is embedded into a water-proof layer by 1m, and the top end of the wall material is flush with the top end of the primary reaction unit; the thickness of the second impervious wall is 0.5m, the wall material is reinforced concrete with few ribs, the bottom end of the second impervious wall is flush with the bottom end of the second-stage reaction unit, the top end of the second impervious wall is slightly lower than the ground, and the top end of the second impervious wall is higher than the highest water level of underground water.
(3) And sequentially paving a lower permeable sand layer, a secondary reaction unit, a primary reaction unit and an upper permeable sand layer from bottom to top in the excavated groove, and continuously paving all the layers to form the wall. The main components of the upper permeable sand layer and the lower permeable sand layer are quartz sand filter materials.
(4) Filling a mixed reaction medium of zero-valent iron powder and quartz sand in the primary reaction unit supporting structure, wherein the particle size of the iron powder is less than 0.25mm, the particle size of the quartz sand is 0.5-1.0mm, and the mixing ratio is 3: 2; and filling a mixed reaction medium of quartz sand and active carbon in the secondary reaction unit supporting structure, wherein the particle size of the active carbon is 2.0mm, and the particle size of the quartz sand is 0.5-1.0 mm. The cross section of the supporting structure is in a parallelogram shape, and the long side of the supporting structure and the horizontal plane form an included angle of 10-30 degrees and are installed and embedded among the waterproof curtain, the first impervious wall and the second impervious wall so as to ensure that the reaction unit is arranged perpendicular to the water flow direction and ensure that the reaction medium and pollutants are fully reacted.
(5) The upper surface and the lower surface of the supporting structure are bonded with the geotechnical composite drainage net, and the four surfaces of the periphery are bonded with the water-swelling layers.
(6) Detecting the COD of the groundwater passing through the vertical multistage permeable reactive barrier in a downstream groundwater monitoring wellCr、NH3The removal effect of-N is good, and the removal rate reaches more than 85%.
Application example 2:
the groundwater in a certain chemical plant is seriously polluted due to the influence of the production of the chemical plant, and the pollution is mainly heavy metal pollution through detection, wherein the content of arsenic is 0.0208 mg/L-0.862 mg/L, the content of hexavalent chromium is 4.6 mg/L-7.3 mg/L, and the arsenic and the hexavalent chromium both seriously exceed the III-class standard limit value of the groundwater quality.
(1) A vertical water-stop curtain covering the whole pollution plume is arranged, and a plurality of opening areas are arranged at proper positions downstream.
(2) Digging a groove in the reserved opening area, constructing and pouring a first impervious wall and a second impervious wall, wherein the thickness of the first impervious wall is 0.2m, the wall material is common concrete, the bottom end of the wall material is embedded into a water-proof layer by 0.5m, and the top end of the wall material is slightly higher than that of the first-stage reaction unit; the thickness of the second impervious wall is 0.2m, the wall material is common concrete, the bottom end of the second impervious wall is slightly lower than the bottom end of the second-stage reaction unit, the top end of the second impervious wall is slightly lower than the ground, and the second impervious wall is higher than the highest water level of underground water.
(3) And sequentially paving a lower permeable sand layer, a secondary reaction unit, a primary reaction unit and an upper permeable sand layer from bottom to top in the excavated groove, and continuously paving all the layers to form the wall. The main components of the upper permeable sand layer and the lower permeable sand layer are quartz sand filter materials.
(4) Filling a zero-valent iron powder reaction medium in the first-stage reaction unit supporting structure; and filling the modified zeolite reaction medium in the secondary reaction unit supporting structure. The cross section of the supporting structure is in a parallelogram shape, and the long side of the supporting structure and the horizontal plane form an included angle of 10-30 degrees and are installed and embedded among the waterproof curtain, the first impervious wall and the second impervious wall so as to ensure that the reaction unit is arranged perpendicular to the water flow direction and ensure that the reaction medium and pollutants are fully reacted.
(5) The upper surface and the lower surface of the supporting structure are bonded with the geotechnical composite drainage net, and the four surfaces of the periphery are bonded with the water-swelling layers.
(6) The underground water passing through the vertical multistage permeable reactive barrier is detected by a downstream underground water monitoring well, wherein main characteristic pollutants arsenic and hexavalent chromium are treated to an acceptable range, and the pollutant removal rate is as high as 98%.
Application example 3:
the underground water in a certain chromium plating factory land block is seriously polluted, the maximum concentration of hexavalent chromium in the underground water is revealed to exceed 10 mg/L and 19 mg/L in the pollution investigation stage, the maximum concentration of hexavalent chromium exceeds the relevant standard limit value, and the environment and a sensitive target are seriously influenced.
(1) A vertical water-stop curtain covering the whole pollution plume is arranged, and a plurality of opening areas are arranged at proper positions downstream.
(2) Digging a groove in the reserved opening area, constructing and pouring a first impervious wall and a second impervious wall, wherein the thickness of the first impervious wall is 0.3m, the wall material is common concrete, the bottom end of the wall material is embedded into a water-proof layer by 0.7m, and the top end of the wall material is slightly higher than that of the first-stage reaction unit; the thickness of the second impervious wall is 0.3m, the wall material is common concrete, the bottom end of the second impervious wall is flush with the bottom end of the second-stage reaction unit, the top end of the second impervious wall is flush with the ground, and the second impervious wall is higher than the highest water level of underground water.
(3) And sequentially paving a lower permeable sand layer, a secondary reaction unit, a primary reaction unit and an upper permeable sand layer from bottom to top in the excavated groove, and continuously paving all the layers to form the wall. The main components of the upper permeable sand layer and the lower permeable sand layer are quartz sand filter materials.
(4) Filling a zero-valent iron powder reaction medium in the first-stage reaction unit supporting structure; and filling an activated carbon reaction medium in the secondary reaction unit supporting structure. The cross section of the supporting structure is in a parallelogram shape, and the long side of the supporting structure and the horizontal plane form an included angle of 10-30 degrees and are installed and embedded among the waterproof curtain, the first impervious wall and the second impervious wall so as to ensure that the reaction unit is arranged perpendicular to the water flow direction and ensure that the reaction medium and pollutants are fully reacted.
(5) The upper surface and the lower surface of the supporting structure are bonded with the geotechnical composite drainage net, and the four surfaces of the periphery are bonded with the water-swelling layers.
(6) Detecting the groundwater passing through the vertical multistage permeable reactive barrier by a downstream groundwater monitoring well, wherein the main characteristic pollutants of hexavalent chromium and TCE are treated to an acceptable range, and Cr is6+The mass concentration of (A) is reduced to be below 0.05 mg/L, and the mass concentration of TCE is reduced to be below 0.5 ug/L.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A vertical multistage permeable reactive barrier which is characterized in that: the anti-seepage reaction wall comprises a first anti-seepage wall, a second anti-seepage wall and a reaction wall body, wherein the first anti-seepage wall and the second anti-seepage wall are respectively arranged on two sides of the reaction wall body; the reaction wall body includes from last apron, upper strata that sets gradually down sand layer, the one-level reaction unit, the second grade reaction unit and the lower floor sand layer that permeates water.
2. The vertical multistage permeable reactive barrier of claim 1, wherein: the waterproof curtain is arranged on the upper stream of the wall body of the reaction wall, and the underground water monitoring well is arranged on the lower stream of the wall body of the reaction wall.
3. The vertical multistage permeable reactive barrier of claim 1, wherein: the first impervious wall is arranged on one side of the upstream of the wall body of the reaction wall, the bottom end of the first impervious wall is embedded into the water-proof layer, and the top end of the first impervious wall is flush with or slightly higher than the top end of the first-stage reaction unit.
4. The vertical multistage permeable reactive barrier of claim 1, wherein: the second impervious wall is arranged on one side of the downstream of the wall body of the reaction wall, the bottom end of the second impervious wall is flush with or slightly lower than the bottom end of the second-stage reaction unit, and the top end of the second impervious wall is flush with or slightly lower than the ground but higher than the highest water level of underground water.
5. The vertical multistage permeable reactive barrier of claim 3, wherein: the thickness of the first impervious wall is 0.2-0.5m, the depth of the bottom end of the first impervious wall embedded into the water-resisting layer is 0.5-1m, the thickness of the second impervious wall is 0.2-0.5m, and the first impervious wall and the second impervious wall are made of common concrete, reinforced concrete with few ribs or plastic concrete.
6. The vertical multistage permeable reactive barrier of claim 1, wherein: first-order reaction unit and second order reaction unit include bearing structure, geotechnological composite drainage network, meet water inflation layer and reaction medium, bearing structure is hexahedron, geotechnological composite drainage network sets up the upper and lower two sides at bearing structure, meet water inflation layer setting around bearing structure, the reaction medium sets up in bearing structure.
7. The vertical multistage permeable reactive barrier of claim 6, wherein: the cross section of the supporting structure is parallelogram, and the long edge of the supporting structure and the horizontal surface form an included angle of 10-30 degrees and are embedded between the first impervious wall and the second impervious wall.
8. The vertical multistage permeable reactive barrier of claim 6, wherein: the reaction medium filled in the secondary reaction unit is one or more of active carbon, modified zeolite, straw, sawdust, compost and coated bimetallic materials.
9. The vertical multistage permeable reactive barrier of claim 2, wherein: the waterproof curtain is symmetrically arranged, one end of the waterproof curtain is connected with the wall body of the reaction wall, and the other end of the waterproof curtain faces the upstream direction of the wall body of the reaction wall.
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| CN201921113026.1U CN211198834U (en) | 2019-07-16 | 2019-07-16 | Vertical multistage permeable reactive barrier |
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