CN110372124A - The vertical multistage permeable reactive barrier system of one kind and its construction method - Google Patents
The vertical multistage permeable reactive barrier system of one kind and its construction 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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The invention discloses a kind of vertical multistage permeable reactive barrier system and its construction methods, reaction wall system includes water-stop curtain, the first cut-pff wall, the second cut-pff wall, reaction wall wall and groundwater monitoring well, the upstream of reaction wall wall is arranged in the water-stop curtain, the downstream of reaction wall wall is arranged in the groundwater monitoring well, and first cut-pff wall and the second cut-pff wall are separately positioned on the two sides of reaction wall wall；The reaction wall wall includes the cover board set gradually from top to bottom, upper layer Permeable Sand Layers, first order reaction unit, second order reaction unit and lower layer's Permeable Sand Layers.The present invention has the characteristics that construction cost is low, maintenance is simple, can handle various pollutant species, integrated treatment is high-efficient, improve the disadvantages of construction cost is high, engineering excavation amount is big when traditional permeable reactive barrier handles multicomponent combined pollution, it can be with quick-replaceable reaction medium in operation maintenance, it is easy to operate, maintenance cost is reduced, popularizing for the based technique for in-situ remediation is conducive to.
Description
Technical field
Repairing Prevention Technique field more particularly to a kind of vertical multistage the present invention relates to contaminated site underground water pollution can seep
Saturating reaction wall system.
Background technique
Permeable reactive barrier (Permeable reactive barrier, PRB) technology is for underground water in-situ immobilization
Pollution remediation technology.The technology is by installing active material wall in underground to intercept pollutant pinnule.When pollution pinniform
After body passes through reaction medium, pollutant translates into environmentally acceptable another form, to realize that pollutant concentration reaches
To the target of environmental standard.PRB is made of permeable reaction medium, is normally placed at the downstream of underground water pollution feathering, when
When polluted underground water passes through PRB, by removing the pollutant in water body the effects of generation precipitating, absorption, redox, thus
Obtain clean underground water.Removably it is lauched organic matter, metal, radioactive substance and the other polluters of dissolution.
Important method of the PRB technology as underground water pollution reparation in the world at present, have continuous in situ processing pollutant,
The advantages such as high treating effect, installation facilitate, sexual valence is higher.But exist simultaneously following disadvantage: (1) being only applicable to water-bearing layer
The lesser region of thickness, and it is big for water-bearing layer thickness, in the case of pollution range is wide, the Construction Cost for building PRB will
It dramatically increases.(2) in system operation, due to the precipitation of reaction product precipitating, reaction wall porosity is caused to reduce, infiltration
The increase of coefficient, so as to cause to block, it is therefore desirable to regularly replace filler and carry out system maintenance.(3) when underground water is received
When polluting simultaneously to various ingredients pollutant, traditional PRB cannot be effectively treated simultaneously；And if establishing concatenated two layers even
If multilayer PRB, and it can greatly increase project amount and rehabilitation cost.
Summary of the invention
It is an object of the invention to: the vertical multistage permeable reactive barrier system of one kind and its construction method are provided, to improve
Construction cost is high when existing permeable reactive barrier skill cardia multicomponent pollutant, maintenance cost is higher, replacement filler behaviour
Make the problems such as complicated.
In order to achieve the above-mentioned object of the invention, The technical solution adopted by the invention is as follows:
A kind of vertical multistage permeable reactive barrier system, including water-stop curtain, the first cut-pff wall, the second cut-pff wall, reaction
The upstream of reaction wall wall, the groundwater monitoring well setting is arranged in wall wall and groundwater monitoring well, the water-stop curtain
In the downstream of reaction wall wall, first cut-pff wall and the second cut-pff wall are separately positioned on the two sides of reaction wall wall；It is described
Reaction wall wall include the cover board set gradually from top to bottom, upper layer Permeable Sand Layers, first order reaction unit, second order reaction unit and
Lower layer's Permeable Sand Layers.
The infiltration coefficient of each layer is both needed to be greater than locating AQUIFER HYDRAULIC 2 times or more, and minimum is not less than 1.2 × 10-
4cm/s.Upper layer Permeable Sand Layers, lower layer's Permeable Sand Layers main component are quartz sand filter media, and infiltration coefficient is greater than first order reaction list
The infiltration coefficient of member and second order reaction unit, this layer primarily serve the effect of underground water filtering, buffering, guarantee reaction member most
Big processing capacity and service life.The cover board is overlying on the top of reaction wall wall, is mainly used for avoiding in system operation
Atmospheric precipitation and think interference of the factor for structure.Groundwater monitoring well location is in cleaning underground water exposure one end, for monitoring
Pollution disposition in system operation provides reliable basis for system maintenance, filter material replacement period etc..
Preferably, the upstream side of reaction wall wall, the bottom end of first cut-pff wall is arranged in first cut-pff wall
It is embedded in water barrier, the top of the first cut-pff wall is concordant or slightly higher with the top of first order reaction unit.
Preferably, the downstream side of reaction wall wall, the bottom end of second cut-pff wall is arranged in second cut-pff wall
Concordant with the bottom end of second order reaction unit, the top of the second cut-pff wall is concordant or slightly lower with ground, but is higher than underground water highest water
Position.Guarantee that guidance underground water flows through total from top to bottom.
Preferably, first cut-pff wall, with a thickness of 0.2-0.5m, the depth of the first cut-pff wall bottom end insertion water barrier is
0.5-1m, the second cut-pff wall with a thickness of 0.2-0.5m, the material of first cut-pff wall and the second cut-pff wall be normal concrete,
The armored concrete or plastic concrete of few muscle.
Preferably, the first order reaction unit and second order reaction unit include support construction, soil engineering composite drainage network, meet water
Expanding layer and reaction medium, the support construction are in hexahedron, and the upper of support construction is arranged in the soil engineering composite drainage network
The surrounding of support construction is arranged in lower two sides, the water-swellable layer, and the reaction medium is arranged in support construction.
Preferably, the cross section parallelogram of the support construction, the long side of support construction is horizontal by 10-
30 ° of angles are embedded between the first cut-pff wall and the second cut-pff wall, to guarantee that reaction member is arranged perpendicular to water (flow) direction, so that instead
It answers and is sufficiently reacted between unit and pollutant.
Preferably, the reaction medium of first order reaction unit filling is the mixed of zeroth order iron powder or zeroth order iron powder and quartz sand
Object, mixed proportion 1-5:2, iron powder partial size < 0.25mm, the quartz sand particle size 0.5-1.0mm are closed, comprehensive partial size guarantees to be situated between
The infiltration coefficient of matter is greater than AQUIFER HYDRAULIC 2 times or more.
Preferably, the reaction medium of the second order reaction unit filling is active carbon, modified zeolite, stalk, sawdust, heap
One or more of fertilizer, cladded type bimetallic material.It integrates infiltration coefficient and is greater than AQUIFER HYDRAULIC 2 times or more, main
It is used for aid in treatment first order reaction unit pollutant difficult to deal with, such as phenol, while adsorbing remaining unreacted pollutant.
Preferably, the water-stop curtain is symmetrically arranged two, one end of the water-stop curtain and the reaction wall wall
Connection, updrift side of the other end towards reaction wall wall.The water-stop curtain needs to cover entire Pollution Plume range, Neng Gouyong
In direct contaminated direction of groundwater flow permeable reactive barrier.
The present invention also provides a kind of construction methods of vertical multistage permeable reactive barrier system, comprising the following steps:
(1) the vertical water-stop curtain for surrounding Pollution Plume is set according to place situation, and several in the setting of downstream suitable position
Open area；
(2) groove, the first cut-pff wall of construction casting and the second cut-pff wall, first antiseepage are excavated in reserved open area
Wall bottom end is embedded in water barrier 0.5-1m, and top is concordant or slightly higher with first order reaction unit top；Second cut-pff wall bottom end with
Second order reaction unit bottom end is concordant or slightly lower, and top is concordant or slightly lower with ground, but should be higher than that underground water peak level；
(3) according to pollution condition, first order reaction unit, second order reaction unit support construction in respectively filling it is corresponding
Packed reaction medium；
(4) soil engineering composite drainage network is bonded in the top and bottom of level-one, second order reaction unit respectively, is met in four side bondings
Water expanding layer；
(5) excavate groove in be layered successively be laid with lower layer's Permeable Sand Layers, second order reaction unit, first order reaction unit, on
Layer Permeable Sand Layers, form reaction wall wall after each layer continuous laying；
(6) cover board is covered at the top of reaction wall wall；
(7) groundwater monitoring well is laid in cleaning underground water exposure side.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
(1) it the present invention provides a kind of permeable reactive barrier for underground water in-situ immobilization multicomponent pollutant and its applies
Work method establishes the means of series connection diaphragm wall when repairing multicomponent pollutant relative to traditional PRB technology, the present invention will handle more
The reaction medium of component pollution is combined well in the same PRB wall, greatly reduces construction work amount, and then reduce
The investment of the fund of reparation.Meanwhile by the way that level-one, second order reaction unit is arranged, replacement is filled out during can simplify system maintenance
The operation of material, the hierarchical design of Permeable Sand Layers, reaction member may be implemented quick clear digging when Zero-valent Iron blocking, and then reduce
Maintenance cost.
(2) present invention has construction cost is low, maintenance is simple, can handle various pollutant species, integrated treatment is high-efficient etc.
Feature improves the disadvantages of construction cost is high, engineering excavation amount is big when traditional permeable reactive barrier handles multicomponent combined pollution,
Can be easy to operate with quick-replaceable reaction medium in operation maintenance, maintenance cost is reduced, the based technique for in-situ remediation is conducive to
Popularize.
Detailed description of the invention
Fig. 1 is the construction process figure of the vertical multistage permeable reactive barrier of one kind provided by the invention；
Fig. 2 is the vertical multistage permeable reactive barrier top view of one kind provided by the invention；
Fig. 3 is the vertical multistage permeable reactive barrier cross-sectional view of one kind provided by the invention；
Fig. 4 is the Structure explosion diagram of level-one provided by the invention or second order reaction unit；
Wherein, 1- reaction wall wall；2- water-stop curtain；The first cut-pff wall of 3-；The second cut-pff wall of 4-；5- groundwater monitoring
Well；6- first order reaction unit；7- second order reaction unit；The upper layer 8- Permeable Sand Layers；9- lower layer Permeable Sand Layers；10- cover board；11- is anti-
Answer medium；12- support construction；13- soil engineering composite drainage network；14- water-swellable layer.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, preferred embodiment is enumerated below, to this hair
Bright further description.However, it is necessary to illustrate, many details listed in specification are used for the purpose of making reader to this
The one or more aspects of invention have a thorough explanation, also may be implemented even without these specific details of the invention
These aspects.
As in Figure 2-4, a kind of vertical multistage permeable reactive barrier of the present invention include water-stop curtain 2, the first cut-pff wall 3,
The upstream of reaction wall wall 1 is arranged in second cut-pff wall 4, reaction wall wall 1 and groundwater monitoring well 5, the water-stop curtain 2,
The downstream of reaction wall wall 1 is arranged in the groundwater monitoring well 5, and first cut-pff wall 3 and the second cut-pff wall 4 are respectively set
In the two sides of reaction wall wall 1；The reaction wall wall 1 includes cover board 10, the upper layer Permeable Sand Layers set gradually from top to bottom
8, first order reaction unit 6, second order reaction unit 7 and lower layer's Permeable Sand Layers 9；The infiltration coefficient of each layer is both needed to be greater than locating water-bearing layer
Infiltration coefficient 2 times or more, and minimum it is not less than 1.2 × 10-4cm/s；Reaction wall wall 1 is anti-close to Pollution Plume side setting first
Wall 3 is seeped, the second cut-pff wall 4 is set close to 5 side of underground water monitoring well.
The upstream side of reaction wall wall 1, the bottom of first cut-pff wall 3 is arranged in first cut-pff wall 3 of the present invention
End insertion water barrier, the top of the first cut-pff wall 3 are concordant or slightly higher with the top of first order reaction unit 6；First cut-pff wall 3
With a thickness of 0.2-0.5m, materials for wall is mainly the armored concrete or plastic concrete of normal concrete, few muscle, bottom end insertion
Water proof layer depth is 0.5-1m, and top is concordant or slightly higher with 6 top of first order reaction unit.
The downstream side of reaction wall wall 1, the bottom of second cut-pff wall 4 is arranged in second cut-pff wall 4 of the present invention
End is concordant with the bottom end of second order reaction unit 7, and the top of the second cut-pff wall 4 is concordant or slightly higher with ground, guarantees guidance underground water
Total is flowed through from top to bottom；Second cut-pff wall 4 with a thickness of 0.2-0.5m, materials for wall be mainly normal concrete,
The armored concrete or plastic concrete of few muscle, bottom end is concordant or slightly lower with 7 bottom end of second order reaction unit, and top and ground are flat
It is neat or slightly lower.
Upper layer Permeable Sand Layers 8 of the present invention, 9 main component of lower layer's Permeable Sand Layers are quartz sand filter media, infiltration coefficient
Greater than first order reaction unit 6, the infiltration coefficient of second order reaction unit 7.
Cover board 10 of the present invention is overlying on 1 top of reaction wall wall, is mainly used for avoiding atmosphere in system operation to drop
Water and think interference of the factor for structure.
Groundwater monitoring well 5 of the present invention is located at cleaning underground water exposure one end, for during supervisory control system running
Pollution disposition, provide reliable basis for system maintenance, filter material replacement period etc..
First order reaction unit 6 and second order reaction unit 7 of the present invention include support construction 12, soil engineering composite drainage network
13, water-swellable layer 14 and reaction medium 11, the first order reaction unit 6 and second order reaction unit 7 include support construction 12, soil
Work composite drainage network 13, water-swellable layer 14 and reaction medium 11, the support construction 12 are in hexahedron, the geosynthetics
The upper and lower surface of support construction 12 is arranged in drainage network 13, and the surrounding of support construction 12, institute is arranged in the water-swellable layer 14
Reaction medium 11 is stated to be arranged in support construction 12.It is respectively set in support construction 12 of the present invention different types of packed anti-
Medium 11 is answered, soil engineering composite drainage network 13, periphery four sides installation water-swellable layer 14 are installed in 12 top and bottom of support construction.Support knot
12 cross section parallelogram of structure, long side is horizontal by 10 ° of -30 ° of angles and between cut-pff wall, to guarantee to react
Unit is arranged perpendicular to water (flow) direction, so that sufficiently reacting between reaction member and pollutant.
It is mainly Zero-valent Iron or Zero-valent Iron, quartz sand mixing that first order reaction unit 6 of the present invention, which fills reaction medium 11,
Object etc., synthesis partial size guarantee that the infiltration coefficient of medium is greater than AQUIFER HYDRAULIC 2 times or more；The second order reaction unit 7
Fill reaction medium 11 main active charcoal, modified zeolite, stalk, sawdust, compost, cladded type bimetallic material etc., infiltration
Coefficient is greater than AQUIFER HYDRAULIC 2 times or more.It is mainly used for the pollutant difficult to deal with of aid in treatment first order reaction unit 6,
Such as phenol, while adsorbing remaining unreacted pollutant.
As shown in Figure 1, implementing a kind of construction method of vertical multistage permeable reactive barrier of the present invention, comprising the following steps:
(1) the vertical water-stop curtain for surrounding Pollution Plume is set according to place situation, and several in the setting of downstream suitable position
Open area；
(2) groove, the first cut-pff wall of construction casting and the second cut-pff wall, the first cut-pff wall bottom are excavated in reserved open area
End insertion water barrier 0.5-1m, top are concordant or slightly higher with first order reaction unit top；Second cut-pff wall bottom end and second order reaction
Unit bottom end is concordant or slightly lower, and top is concordant or slightly lower with ground, but should be higher than that underground water peak level；
(3) according to pollution condition, first order reaction unit, second order reaction unit support construction in respectively filling it is corresponding
Packed reaction medium, to guarantee maximum pollution treatment effeciency；
(4) soil engineering composite drainage network is bonded in the top and bottom of level-one, second order reaction unit respectively, is met in four side bondings
Water expanding layer, so that reaction member can be chimeric with the cut-pff wall of connection and water-stop curtain sealing；
(5) excavate groove in be layered successively be laid with lower layer's Permeable Sand Layers, second order reaction unit, first order reaction unit, on
Layer Permeable Sand Layers, form wall after each layer continuous laying；
(6) cover board is covered at the top of wall；
(7) groundwater monitoring well is laid in cleaning underground water exposure side.
It is application example of the invention below:
Application Example 1:
Certain landfill leachate causes Groundwater Pollution, and landfill leachate is usually to be made jointly by Multiple components pollutant
At compound pollution.Through detecting, landfill leachate flows through the pollution water sample pollution concentration behind water-bearing layer are as follows: CODcr955mg/L,
NH3-N105.5mg/L.It is repaired using the vertical multistage permeable reactive barrier of one kind of the present invention and construction method.It applies
Work method is as follows:
(1) setting covers the vertical water-stop curtain of entire Pollution Plume, and several open areas are arranged in downstream suitable position.
(2) groove, the first cut-pff wall of construction casting and the second cut-pff wall, the first antiseepage wall thickness are excavated in reserved open area
Degree is 0.5m, and materials for wall selects the armored concrete of few muscle, and bottom end is embedded in water barrier 1m, top and first order reaction unit top
Concordantly；For second cut-pff wall with a thickness of 0.5m, materials for wall selects the armored concrete of few muscle, bottom end and second order reaction unit bottom
Hold level with both hands together, top is slightly lower with ground, simultaneously above underground water peak level.
(3) lower layer's Permeable Sand Layers, second order reaction unit, first order reaction list are successively laid with from upper from lower in the groove of excavation
Member, upper layer Permeable Sand Layers form wall after each layer continuous laying.Upper layer Permeable Sand Layers and lower layer's Permeable Sand Layers main component are selected
Quartz sand filter media.
(4) mixed reaction media of zeroth order iron powder and quartz sand is filled in first order reaction unit support structure, wherein iron
Powder diameter < 0.25mm, quartz sand particle size 0.5-1.0mm, mixed proportion 3:2；It is filled in second order reaction unit support structure
The mixed reaction media of quartz sand, active carbon, wherein activated carbon particle size 2.0mm, quartz sand particle size 0.5-1.0mm.Support construction
Cross section parallelogram, long side is horizontal by the installation of 10 ° of -30 ° of angles embedded in water-stop curtain, the first cut-pff wall and the
Between two cut-pff walls, to guarantee that reaction member is arranged perpendicular to water (flow) direction, so that sufficiently anti-between reaction medium and pollutant
It answers.
(5) on the support structure, bond soil engineering composite drainage network below, periphery four sides bonding water-swellable layer.
(6) pass through the underground water after vertical multistage permeable reactive barrier, COD in the detection of downstream underground water monitoring wellCr、
NH3The removal effect of-N is good, and removal rate reaches 85% or more.
Application Example 2:
Certain chemical plant plot underground water is heavily polluted by chemical plant Influence of production, is detected, and pollution is mainly a huge sum of money
Belong to pollution.Wherein, arsenic content 0.0208mg/L-0.862mg/L, content of 6-valence Cr ions 4.6mg/L-7.3mg/L are serious super
Cross groundwater quality Group III standard limited value.Using the vertical multistage permeable reactive barrier of one kind of the present invention and construction method
It is repaired.Construction method is as follows:
(1) setting covers the vertical water-stop curtain of entire Pollution Plume, and several open areas are arranged in downstream suitable position.
(2) groove, the first cut-pff wall of construction casting and the second cut-pff wall, the first antiseepage wall thickness are excavated in reserved open area
Degree is 0.2m, and materials for wall selects normal concrete, and bottom end is embedded in water barrier 0.5m, and top is omited than first order reaction unit top
It is high；Second cut-pff wall selects normal concrete with a thickness of 0.2m, materials for wall, and bottom end is more slightly lower than second order reaction unit bottom end,
Top is slightly lower with ground, simultaneously above underground water peak level.
(3) lower layer's Permeable Sand Layers, second order reaction unit, first order reaction list are successively laid with from upper from lower in the groove of excavation
Member, upper layer Permeable Sand Layers form wall after each layer continuous laying.Upper layer Permeable Sand Layers and lower layer's Permeable Sand Layers main component are selected
Quartz sand filter media.
(4) zeroth order iron powder reaction medium is filled in first order reaction unit support structure；In second order reaction unit supports knot
Filling-modified zeolite reaction medium in structure.Support construction cross section parallelogram, long side is horizontal by 10 ° of -30 ° of folders
Angle installation is embedded between water-stop curtain, the first cut-pff wall and the second cut-pff wall, to guarantee that reaction member is set perpendicular to water (flow) direction
It sets, so that sufficiently being reacted between reaction medium and pollutant.
(5) on the support structure, bond soil engineering composite drainage network below, periphery four sides bonding water-swellable layer.
(6) pass through the underground water after vertical multistage permeable reactive barrier, master therein in the detection of downstream underground water monitoring well
Characteristic contamination arsenic, Cr VI is wanted to be processed tolerance interval, pollutants removal rate is up to 98%.
Application Example 3:
Underground water is seriously polluted in certain chromium plating factory plot, and it is maximum that the pollution surveys stage discloses Cr VI in underground water
Concentration is more than 10mg/L, TCE maximum concentration 19mg/L, is more than relevant criterion limit value, causes seriously to environment and sensitive target
It influences.It is repaired using the vertical multistage permeable reactive barrier of one kind of the present invention and construction method.Construction method is as follows:
(1) setting covers the vertical water-stop curtain of entire Pollution Plume, and several open areas are arranged in downstream suitable position.
(2) groove, the first cut-pff wall of construction casting and the second cut-pff wall, the first antiseepage wall thickness are excavated in reserved open area
Degree is 0.3m, and materials for wall selects normal concrete, and bottom end is embedded in water barrier 0.7m, and top is omited than first order reaction unit top
It is high；Second cut-pff wall selects normal concrete with a thickness of 0.3m, materials for wall, and bottom end is concordant with second order reaction unit bottom end,
Top is concordant with ground, simultaneously above underground water peak level.
(3) lower layer's Permeable Sand Layers, second order reaction unit, first order reaction list are successively laid with from upper from lower in the groove of excavation
Member, upper layer Permeable Sand Layers form wall after each layer continuous laying.Upper layer Permeable Sand Layers and lower layer's Permeable Sand Layers main component are selected
Quartz sand filter media.
(4) zeroth order iron powder reaction medium is filled in first order reaction unit support structure；In second order reaction unit supports knot
Active carbon reaction medium is filled in structure.Support construction cross section parallelogram, long side is horizontal by 10 ° of -30 ° of angles
Installation is embedded between water-stop curtain, the first cut-pff wall and the second cut-pff wall, to guarantee that reaction member is arranged perpendicular to water (flow) direction,
So that sufficiently being reacted between reaction medium and pollutant.
(5) on the support structure, bond soil engineering composite drainage network below, periphery four sides bonding water-swellable layer.
(6) pass through the underground water after vertical multistage permeable reactive barrier, master therein in the detection of downstream underground water monitoring well
Characteristic contamination Cr VI, TCE is wanted to be processed tolerance interval, Cr6+Mass concentration be reduced to 0.05mg/L hereinafter,
The mass concentration of TCE is reduced to 0.5ug/L or less.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of vertical multistage permeable reactive barrier system, it is characterised in that: prevent including water-stop curtain, the first cut-pff wall, second
Wall, reaction wall wall and groundwater monitoring well are seeped, the upstream of reaction wall wall, the underground water prison is arranged in the water-stop curtain
The downstream of reaction wall wall is arranged in well logging, and first cut-pff wall and the second cut-pff wall are separately positioned on the two of reaction wall wall
Side；The reaction wall wall includes that the cover board set gradually from top to bottom, upper layer Permeable Sand Layers, first order reaction unit, second level are anti-
Answer unit and lower layer's Permeable Sand Layers.
2. vertical multistage permeable reactive barrier system according to claim 1, it is characterised in that: first cut-pff wall is set
The upstream side in reaction wall wall is set, the bottom end of first cut-pff wall is embedded in water barrier, the top of the first cut-pff wall and one
The top of order reaction unit is concordant or slightly higher.
3. vertical multistage permeable reactive barrier system according to claim 1, it is characterised in that: second cut-pff wall is set
It sets in the downstream side of reaction wall wall, the bottom end of second cut-pff wall is concordant or slightly lower with the bottom end of second order reaction unit,
The top of second cut-pff wall is concordant or slightly lower with ground, but is higher than underground water peak level.
4. vertical multistage permeable reactive barrier system according to claim 2, it is characterised in that: the first antiseepage wall thickness
Degree is 0.2-0.5m, and the depth that the first cut-pff wall bottom end is embedded in water barrier is 0.5-1m, the second cut-pff wall with a thickness of 0.2-0.5m,
The material of first cut-pff wall and the second cut-pff wall is the armored concrete or plastic concrete of normal concrete, few muscle.
5. vertical multistage permeable reactive barrier system according to claim 1, it is characterised in that: the first order reaction unit
And second order reaction unit includes support construction, soil engineering composite drainage network, water-swellable layer and reaction medium, the support construction is in
The upper and lower surface of support construction is arranged in hexahedron, the soil engineering composite drainage network, and the water-swellable layer setting is supporting
The surrounding of structure, the reaction medium are arranged in support construction.
6. vertical multistage permeable reactive barrier system according to claim 5, it is characterised in that: the cross of the support construction
The long side of section parallelogram, support construction is embedded in the first cut-pff wall and the second cut-pff wall horizontal by 10-30 ° of angle
Between.
7. vertical multistage permeable reactive barrier system according to claim 5, it is characterised in that: the first order reaction unit
The reaction medium of filling is the mixture of zeroth order iron powder or zeroth order iron powder and quartz sand, mixed proportion 1-5:2, the iron powder grain
Diameter < 0.25mm, quartz sand particle size 0.5-1.0mm.
8. vertical multistage permeable reactive barrier system according to claim 5, it is characterised in that: the second order reaction unit
The reaction medium of filling is one of active carbon, modified zeolite, stalk, sawdust, compost, cladded type bimetallic material or several
Kind.
9. vertical multistage permeable reactive barrier system according to claim 1, it is characterised in that: the water-stop curtain is pair
Claim two of setting, one end of the water-stop curtain and the reaction wall wall connecting, the other end is towards the upstream of reaction wall wall
Direction.
10. a kind of construction method of vertical multistage permeable reactive barrier system, it is characterised in that: the following steps are included:
(1) the vertical water-stop curtain for surrounding Pollution Plume is set according to place situation, and several openings are set in downstream suitable position
Region；
(2) groove, the first cut-pff wall of construction casting and the second cut-pff wall, first cut-pff wall bottom are excavated in reserved open area
End insertion water barrier 0.5-1m, top are concordant or slightly higher with first order reaction unit top；Second cut-pff wall bottom end and second level
Reaction member bottom end is concordant or slightly lower, and top is concordant or slightly lower with ground, but should be higher than that underground water peak level；
(3) according to pollution condition, first order reaction unit, second order reaction unit support construction in respectively filling it is corresponding packed
Reaction medium；
(4) soil engineering composite drainage network is bonded in the top and bottom of level-one, second order reaction unit respectively, it is swollen to meet water in four side bondings
Swollen layer；
(5) it is layered that be successively laid with lower layer's Permeable Sand Layers, second order reaction unit, first order reaction unit, upper layer saturating in groove excavating
Water sand layer forms reaction wall wall after each layer continuous laying；
(6) cover board is covered at the top of reaction wall wall；
(7) groundwater monitoring well is laid in cleaning underground water exposure side.
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| CN111807437A (en) * | 2020-07-20 | 2020-10-23 | 四川省冶勘设计集团有限公司 | Modular PRB repairing method with environment risk control function |
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| CN115215403A (en) * | 2021-04-16 | 2022-10-21 | 中国电建集团华东勘测设计研究院有限公司 | Composite underground vertical antifouling barrier system and method for controlling pollutant migration |
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| CN114393018A (en) * | 2022-01-14 | 2022-04-26 | 生态环境部南京环境科学研究所 | Underground water circulating treatment method of in-situ reduction-extraction oxidation |
| CN114393018B (en) * | 2022-01-14 | 2023-01-06 | 生态环境部南京环境科学研究所 | Underground water circulating treatment method of in-situ reduction-extraction oxidation |
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