CN113896273B - Permeable reactive wall structure and method for treating pollution plume by permeable reactive wall structure - Google Patents
Permeable reactive wall structure and method for treating pollution plume by permeable reactive wall structure Download PDFInfo
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- CN113896273B CN113896273B CN202111292730.XA CN202111292730A CN113896273B CN 113896273 B CN113896273 B CN 113896273B CN 202111292730 A CN202111292730 A CN 202111292730A CN 113896273 B CN113896273 B CN 113896273B
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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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
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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 relates to a permeable reactive barrier and a method for treating pollution plume by the permeable reactive barrier, which comprises the following steps: setting an incomplete well in a polluted aquifer to perform reduced pressure flow collection on the polluted underground water and capture the polluted underground water; a water guide pipe is arranged at one side of the incomplete well and used for converging and leading out the polluted underground water in the incomplete well to a permeable reactive wall; and filling active filler in the permeable reactive wall, and intercepting or removing pollution components in underground water through the active filler to realize purification treatment of the polluted underground water. The invention can effectively solve the problems of large excavation difficulty, high installation cost, low utilization rate of active filler, irreversible interference easily caused by underground water flow fields and the like in the traditional permeable reactive wall structure type.
Description
Technical Field
The invention relates to the technical field of groundwater pollution control and remediation, in particular to a permeable reactive wall structure and a method for treating pollution plume by using the same.
Background
The permeable reactive barrier is an in-situ remediation technology for intercepting or removing pollution components in underground water by using specific active fillers through the actions of adsorption, precipitation, oxidation reduction and the like. Compared with other groundwater remediation technologies, the permeable reactive barrier has the advantages of low energy consumption, simple and convenient management, capability of treating polluted groundwater for a long time and the like, and is a green and sustainable groundwater in-situ remediation technology. The structure type of the permeable reactive barrier determines the groundwater remediation effect and cost to a great extent, and the permeable reactive barrier is selected by combining the hydrogeological characteristics of the polluted site and the scale of the pollution plume. The traditional permeable reactive wall structure types are a continuous permeable reactive wall, a funnel-water guide door type reactive wall and an injection type reactive zone. However, there are several major problems with conventional permeable reactive wall construction types: 1) The dependence on hydrogeological characteristics and pollution plume range of a repair site is large, and excavation difficulty and installation cost of the repair site are increased when underground water is deeply buried and pollution plume is overlarge in scale. 2) The pollutant concentration of the pollution plume is usually not uniformly distributed, which leads to low utilization rate of the active filler and is easy to cause local breakdown effect. 3) Irreversible interference to the flow field of the underground water is easy to cause.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a permeable reactive wall structure and a method for treating pollution plume thereof, which effectively solve the problems of the conventional permeable reactive wall structure, such as high excavation difficulty, high installation cost, low utilization rate of active fillers, and irreversible interference caused by groundwater flow fields.
In order to achieve the above object, on one hand, the technical scheme adopted by the invention is as follows: a method of treating pollution plume by a permeable reactive wall structure, comprising: setting an incomplete well in a polluted aquifer to perform reduced pressure flow collection on the polluted underground water and capture the polluted underground water; a water guide pipe is arranged at one side of the incomplete well and used for converging and leading out the polluted underground water in the incomplete well to a permeable reactive wall; and filling active filler in the permeable reactive wall, and intercepting or removing pollution components in underground water by the active filler to realize purification treatment of the polluted underground water.
Further, a buffer water distribution layer is arranged on the water inlet side of the permeable reactive barrier; the buffer water distribution layer is connected with the water diversion conduit, and the gathered underground water uniformly flows through the permeable reactive barrier.
Further, the setting of the incomplete well comprises:
arranging the incomplete well near a large-flow section in a polluted aquifer with a large hydraulic gradient;
the non-completion well is disposed at a depth less than a depth of the contaminated groundwater.
Further, the diversion conduit confluently directs the contaminated groundwater within the incomplete well to a permeable reactive wall, comprising:
when water flows out of the water guide conduit, the water head in the incomplete well is lower than the water head of the polluted underground water nearby, so that a water head difference is generated;
the water head difference drives the polluted underground water collected in the incomplete well to continuously enter the water guide conduit and be guided to the permeable reactive wall by the water guide conduit.
Further, the capturing contaminated groundwater includes:
the water head difference enables polluted underground water near the incomplete well to be collected into the incomplete well, hydraulic barriers are formed on two sides of the downstream of the landfill, and the width of pollution plumes is reduced;
and the polluted underground water is collected into the incomplete well from the well wall and the well bottom, and the deeper polluted underground water is captured.
Further, the permeability coefficient of the active filler is greater than the permeability coefficient of the surrounding aqueous medium.
On the other hand, the technical scheme adopted by the invention is as follows: a permeable reactive wall structure for implementing the above method, comprising: the permeable reactive barrier is arranged at the downstream of the pollution plume; the pressure-reducing collecting system is arranged at the upstream of the permeable reactive wall and used for collecting the polluted underground water to the permeable reactive wall from the pressure-reducing collecting system; and the active filler is arranged in the permeable reactive wall and is used for capturing pollutants and purifying polluted underground water.
Further, the reduced pressure manifold system includes:
the incomplete well is arranged in a polluted aquifer with large hydraulic gradient and is positioned near the large-flow section;
and the water guide pipe is used for connecting the incomplete well and the permeable reactive wall.
Furthermore, a buffer water distribution layer is arranged on the water inlet side of the permeable reactive barrier; the buffer water distribution layer is positioned between the water diversion guide pipe and the permeable reactive barrier.
Further, the active filler is provided in at least one layer.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention collects the polluted underground water through the pressure-reducing flow-collecting facility to reduce the scale of pollution plume, the design size (length and height) of the permeable reactive barrier is reduced, and the construction difficulty and the repair cost are obviously reduced.
2. According to the invention, a vertical barrier is not required to be built around the landfill site, and the hydraulic gradient in the hydrogeological environment can be used for realizing non-exogenous power operation, so that the operation cost is reduced.
3. The invention mixes and allocates the groundwater with different pollutant concentrations in the decompression flow collecting well, and then the groundwater uniformly flows through the permeable reactive barrier through the aqueduct and the buffering water distribution layer, which greatly improves the utilization rate of the active filler, thereby prolonging the service life of the permeable reactive barrier.
4. The invention can close the pressure-reducing flow-collecting facility after the repair is finished, and is easy to restore to the original underground water flow field.
Drawings
FIG. 1 is a sectional view of a pressure-reducing and flow-collecting type permeable reactive barrier according to an embodiment of the present invention;
FIG. 2 is a plan view of a pressure-reducing and flow-collecting type permeable reactive barrier according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The permeable reactive wall structure and the method for treating the pollution plume thereof provided by the invention have the advantages that the incomplete well is arranged in the polluted aquifer to carry out reduced pressure flow collection on the polluted underground water, so that the polluted underground water is captured; a water guide pipe is arranged at one side of the incomplete well and is positioned at the downstream of the polluted underground water, so that the polluted underground water in the incomplete well is converged and led out to the permeable reactive barrier; active filler is filled in the permeable reactive wall, and the active filler is used for intercepting or removing the pollution components in the underground water, so that the purification treatment of the polluted underground water is realized. The invention can effectively solve the problems of large excavation difficulty, high installation cost, low utilization rate of active filler, irreversible interference easily caused by underground water flow fields and the like in the traditional permeable reactive wall structure type.
In one embodiment of the invention, a method for treating pollution plume by a permeable reactive wall structure is provided. The embodiment is mainly used for solving the groundwater remediation problems of large hydraulic gradient, fast groundwater flow speed and large pollution plume scale, and aims at the groundwater remediation situation of leachate pollution of a valley type landfill, as shown in fig. 1 and 2, the method comprises the following steps:
1) Arranging an incomplete well 1 in the polluted aquifer 8 to perform reduced pressure flow collection on the polluted underground water and capture the polluted underground water;
2) A water guide pipe 2 is arranged at one side of the incomplete well 1 at the downstream of the polluted underground water, and the polluted underground water in the incomplete well 1 is converged and led out to a permeable reactive barrier 4;
3) Active filler 5 is filled in the permeable reactive barrier 4, and the purification treatment of the polluted underground water is realized by intercepting or removing the pollution components in the underground water through the active filler 5.
In the above embodiment, the water inlet side of the permeable reactive barrier 4 is provided with the buffer water distribution layer 3; the buffer water distribution layer 3 is connected with the water guide pipe 2, and the gathered underground water flows through the permeable reactive barrier 4 uniformly.
In this embodiment, the buffering water distribution layer 3 can play a role in buffering transition and uniform water distribution, so that the gathered polluted underground water can uniformly flow through the permeable reactive barrier 4.
When the permeable reactive barrier is used, underground water containing different pollutant concentrations is mixed and prepared in the incomplete well 1, and then the underground water uniformly flows through the permeable reactive barrier 4 through the water guide pipe 2 and the buffering water distribution layer 3, so that the utilization rate of the active filler 5 is greatly improved, and the service life of the permeable reactive barrier 4 is prolonged.
In the step 1), the setting method of the incomplete well 1 comprises the following steps: in a polluted aquifer 8 with a large hydraulic gradient, an incomplete well 1 is arranged near a large-flow section; the depth of the non-completed well 1 is set to be lower than the depth of the contaminated groundwater.
In the step 2), the water guide pipe 2 converges and leads out the polluted groundwater in the incomplete well 1 to the permeable reactive barrier 4, which specifically comprises the following steps:
when water flows out of the water guide pipe 2, the water head in the incomplete well 1 is lower than the water head of nearby polluted underground water, and a water head difference is generated;
the polluted underground water collected in the incomplete well 1 is driven by the water head difference to continuously enter the water guide pipe 2 and is led out to the permeable reactive barrier 4 by the water guide pipe 2.
Preferably, the method for capturing contaminated groundwater comprises:
the water head difference enables polluted underground water near the incomplete well 1 to be collected into the incomplete well 1, hydraulic blocking is formed on two sides of the downstream of the landfill, and the width of pollution plumes is reduced;
because the depth of the incomplete well 1 is lower than that of the polluted underground water, the polluted underground water can be collected into the incomplete well 1 through the well wall and the water inlet at the bottom of the well, deeper polluted underground water can be captured, and the design height of the permeable reactive barrier 4 is further obviously reduced. For the conventional construction type, the permeable reactive barrier is typically embedded 60cm below the water-stop floor 9.
For example, as shown in fig. 1, when the incomplete well 1 is discharged at a certain flow rate through the water conduit 2, the original water level 6 at the position of the incomplete well 1 is lowered to a water level 7, and the water head in the incomplete well 1 is lower than the water head of the nearby polluted underground water, so that the polluted underground water near the incomplete well 1 is collected into the incomplete well 1, and hydraulic barriers are formed at the two sides of the downstream of the landfill site (as shown in fig. 2) to reduce the width of pollution plume, thereby reducing the design length of the permeable reactive wall 4.
In step 3) above, the permeability coefficient of the active filler 5 is greater than the permeability coefficient of the surrounding aqueous medium. When in use, the active filler 5 intercepts or removes the pollution components in the underground water through the actions of adsorption, precipitation, oxidation reduction and the like.
In this embodiment, the active filler 5 is screened according to the type and concentration of the target pollutant in the pollution plume, so as to ensure that the target pollutant can be effectively degraded or fixed, and common active fillers include zero-valent iron, activated carbon, zeolite, and the like, and a single-layer or multi-layer filler can be placed. By setting the permeability coefficient of the active filler 5 to be larger than that of the surrounding aqueous medium, the pollution plume does not generate the phenomenon of flow by-pass when flowing through the reaction zone, but cannot be too large, so as to ensure that the pollutants and the filler have enough contact reaction time.
In one embodiment of the present invention, a permeable reactive wall structure is provided that enables reduced pressure mass flow. In this embodiment, the permeable reactive wall structure is used to implement any one of the methods in the above embodiments, as shown in fig. 1 and 2, and the permeable reactive wall structure includes:
the permeable reactive barrier 4 is arranged at the downstream of the pollution plume;
the pressure-reducing collecting system is arranged at the upstream of the permeable reactive barrier 4 and collects the polluted underground water to the permeable reactive barrier 4 from the pressure-reducing collecting system;
and the active filler 5 is arranged in the permeable reactive barrier 4 and is used for capturing pollutants and purifying polluted underground water.
In the above embodiment, the reduced pressure manifold system includes:
the non-integral well 1 is arranged in a polluted aquifer 8 with a large hydraulic gradient and is positioned near a large-flow section; in this embodiment, the incomplete well 1 is a pressure-reducing collecting well without external power.
A water guide pipe 2 for connecting the incomplete well 1 and the permeable reactive barrier 4; when the underground water pressure reducing and collecting well is used, underground water gathered in the pressure reducing and collecting well 1 flows to the buffering water distribution layer 3 through the water conduit 2 under the driving of a water head difference.
In the above embodiment, the water inlet side of the permeable reactive barrier 4 is provided with the buffer water distribution layer 3; the buffer water distribution layer 3 is positioned between the water guide pipe 2 and the permeable reactive barrier 4 and has the functions of buffer transition and uniform water distribution, so that the gathered underground water can uniformly flow through the permeable reactive barrier 4.
In the above embodiment, the active filler 5 is provided in at least one layer. The polluted components in the underground water are intercepted or removed through the actions of adsorption, precipitation, oxidation reduction and the like of the active filler 5, the active filler 5 is screened according to the type and concentration of target pollutants in the polluted feather, and single-layer or multi-layer fillers can be placed, so that the purification treatment of the polluted underground water is realized.
The system provided in this embodiment is used for executing the above method embodiments, and for details of the process and the details, reference is made to the above embodiments, which are not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for treating pollution plume through a permeable reactive wall structure, comprising:
setting an incomplete well in a polluted aquifer to perform reduced pressure flow collection on the polluted underground water and capture the polluted underground water;
a water guide pipe is arranged on one side of the incomplete well and used for converging and leading the polluted underground water in the incomplete well to a permeable reactive barrier;
filling active fillers in the permeable reactive wall, intercepting or removing pollution components in underground water through the active fillers, and realizing purification treatment of polluted underground water;
a buffer water distribution layer is arranged on the water inlet side of the permeable reactive barrier; the buffer water distribution layer is connected with the water diversion conduit, so that the gathered underground water uniformly flows through the permeable reactive barrier;
the setting of an incomplete well comprises:
arranging the incomplete well near a large-flow section in a polluted aquifer with a large hydraulic gradient;
setting the depth of the incomplete well to be lower than the depth of the contaminated groundwater;
the water guide conduit leads polluted underground water in the incomplete well to a permeable reactive barrier in a confluence mode, and comprises:
when water flows out of the water guide pipe, the water head in the incomplete well is lower than the water head of nearby polluted underground water, and a water head difference is generated;
the water head difference drives the polluted underground water collected in the incomplete well to continuously enter the water guide pipe and be guided out to the permeable reactive wall by the water guide pipe;
the capturing contaminated groundwater, comprising:
the water head difference enables polluted underground water near the incomplete well to be collected into the incomplete well, hydraulic barriers are formed on two sides of the downstream of the landfill, and the width of pollution plumes is reduced; wherein, the polluted underground water is collected into an incomplete well through a well wall and well bottom water inlet;
the polluted underground water is converged to the incomplete well from the well wall and the well bottom, and the deeper polluted underground water is captured.
2. The method of claim 1, wherein the active filler has a permeability coefficient greater than the permeability coefficient of the surrounding aqueous medium.
3. A permeable reactive wall structure for implementing the method according to any one of claims 1 to 2, comprising:
the permeable reactive barrier is arranged at the downstream of the pollution plume;
the pressure-reducing collecting system is arranged at the upstream of the permeable reactive wall and used for collecting the polluted underground water to the permeable reactive wall from the pressure-reducing collecting system;
and the active filler is arranged in the permeable reactive wall and is used for capturing pollutants and purifying polluted underground water.
4. A permeable reactive wall structure according to claim 3, wherein said reduced pressure manifold system comprises:
the incomplete well is arranged in a polluted aquifer with large hydraulic gradient and is positioned near the large-flow section;
and the water guide pipe is used for connecting the incomplete well and the permeable reactive wall.
5. A permeable reactive barrier structure according to claim 3, wherein the water inlet side of the permeable reactive barrier is provided with a buffer water distribution layer; the buffer water distribution layer is positioned between the water diversion guide pipe and the permeable reactive barrier.
6. A permeable reactive wall structure according to claim 3, wherein the active filler is provided as at least one layer.
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| CN105668680B (en) * | 2016-01-19 | 2018-05-04 | 中国科学院南京土壤研究所 | A kind of method using mercury pollution in magnetic iron ore and bauxite slag in-situ remediation of underground water |
| CN106242029B (en) * | 2016-08-23 | 2019-08-16 | 中国环境科学研究院 | A kind of karez formula underground water pollution repair system |
| CN106975653A (en) * | 2017-04-19 | 2017-07-25 | 合肥工业大学 | It is a kind of to prevent the permeable reactive barrier in-situ remediation method of pollution of underground aquifers |
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