CN113718855A - Structure for improving efficiency of repairing underground water by multi-sieve-mesh well - Google Patents
Structure for improving efficiency of repairing underground water by multi-sieve-mesh well Download PDFInfo
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- CN113718855A CN113718855A CN202111060171.XA CN202111060171A CN113718855A CN 113718855 A CN113718855 A CN 113718855A CN 202111060171 A CN202111060171 A CN 202111060171A CN 113718855 A CN113718855 A CN 113718855A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
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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
- 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 structure for improving groundwater remediation efficiency of a multi-sieve-mesh well, which comprises the multi-sieve-mesh well arranged in an aquifer to be remedied, wherein a plurality of impermeable areas and sieve-mesh areas are arranged on the wall of the multi-sieve-mesh well at intervals, a heterogeneous porous medium area is arranged on the outer side of the wall of the multi-sieve-mesh well, and comprises a first medium area and a second medium area which are arranged at intervals, wherein the first medium area is opposite to the impermeable areas, the permeability of the first medium area is higher than that of the second medium, the rest areas are filled with the second medium, and the second medium is selected from the aquifer porous medium. The method can further improve the repairing efficiency of groundwater pollution on the basis of an in-situ multi-sieve-mesh well repairing method, and enables the repairing liquid conveyed to the area to be repaired through the multi-sieve-mesh well to gather and flow around by artificially manufacturing heterogeneous geological conditions on the outer side of the well wall of the in-situ multi-sieve-mesh well, so that the transverse dispersion of the repairing liquid is increased, and the mass exchange flux and the reaction mixing efficiency between the repairing liquid and groundwater pollutants are improved.
Description
Technical Field
The invention relates to a structure for improving groundwater remediation efficiency, in particular to a structure for improving groundwater remediation efficiency of a multi-sieve-mesh well.
Background
Groundwater is an important component of water resources, and control and remediation of groundwater pollution is imminent. The method for repairing underground water by using in-situ multi-sieve-hole well is characterized by that the repairing liquid is injected into polluted aquifer by means of multi-sieve-hole well, and the repairing liquid is divided into several plumes by means of several sieve-hole regions, so that the repairing liquid and pollutant can be fully mixed, and the pollutant can be degraded by means of biochemical reaction.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a structure for improving the efficiency of repairing underground water by a multi-sieve-mesh well, which enhances the mixing of a repairing liquid and pollutants in the underground water and improves the repairing efficiency by artificially manufacturing heterogeneous geological conditions outside the wall of the multi-sieve-mesh well.
The technical scheme is as follows: the multi-mesh well comprises a multi-mesh well arranged in an aquifer to be repaired, wherein a plurality of impermeable areas and mesh areas are arranged on the well wall of the multi-mesh well at intervals, a porous medium area is arranged on the outer side of the well wall of the multi-mesh well and comprises a first medium area and a second medium area, the first medium area and the second medium area are arranged at intervals, the first medium area is opposite to the impermeable areas, and the rest areas are filled with a second medium.
The permeability of the first medium area is higher than that of the second medium area, the first medium is a high-permeability porous medium, gravel is adopted in the invention, the second medium is an aquifer porous medium, and sandstone is adopted in the invention.
The first region of media has a thickness no greater than the thickness of the water impermeable zone.
The first medium area and the second medium area are arranged at intervals along the height direction of the multi-sieve-hole well, and the heterogeneous geological condition is artificially manufactured.
The filling method of the first medium region and the second medium region comprises the following steps:
(1) acquiring geological parameters of a polluted area of an aquifer to be repaired;
(2) determining the porosity, permeability coefficient and size of the first medium region and the second medium region according to the geological parameters and the structure of the multi-sieve-hole well;
(3) the positions between adjacent screen hole areas are filled with a first medium, and other well wall outer side areas are filled with a second medium.
And the geological parameters of the aquifer polluted area to be repaired comprise soil porosity and permeability coefficient.
The first medium is a porous medium with higher permeability than the aquifer, and the gravel is adopted in the invention.
The second medium is a water-bearing layer porous medium, and the sand is adopted in the invention.
Has the advantages that: the method can further improve the repairing efficiency of groundwater pollution on the basis of an in-situ multi-sieve-mesh well repairing method, and enables the repairing liquid conveyed to the area to be repaired through the multi-sieve-mesh well to gather and flow around by artificially manufacturing heterogeneous geological conditions on the outer side of the well wall of the in-situ multi-sieve-mesh well, so that the transverse dispersion of the repairing liquid is increased, the mass exchange flux and the reaction mixing efficiency between the repairing liquid and groundwater pollutants are improved, the reaction efficiency can be effectively enhanced under the condition of low investment cost, and the groundwater repairing effect is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a conceptual model diagram of two-dimensional numerical simulation according to an embodiment of the present invention;
FIG. 3a is a solute plume plot for homogeneous geological conditions in an embodiment of the present invention;
FIG. 3b is a solute plume plot for a heterogeneous geological condition in an embodiment of the present invention;
FIG. 4 is a graph of the improvement efficiency of varying the position of the gravel layer in an embodiment of the present invention;
FIG. 5 is a graph of the efficiency of the change in the size of the gravel layer in an embodiment of the present invention;
fig. 6(a) is a graph of the improvement efficiency of changing the mesh spacing at position 1 in the example of the present invention;
fig. 6(b) is a graph showing the improvement efficiency of changing the mesh pitch at position 2 in the example of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in figure 1, the invention comprises a multi-sieve-hole well 2 arranged in an aquifer 1 to be repaired, a watertight area 201 and a sieve-hole area 202 are arranged on the wall of the multi-sieve-hole well 2 at intervals, and groundwater repair liquid enters the aquifer 1 to be repaired from the sieve-hole area 202 of the multi-sieve-hole well 2. The outer side of the well wall of the multi-sieve-pore well 2 is provided with a heterogeneous porous medium area along the height direction, the heterogeneous porous medium area comprises a water-bearing layer porous medium area and a high-permeability porous medium area, and the repairing liquid is gathered and flowed around by artificially manufacturing heterogeneous geological conditions on the outer side of the well wall of the in-situ multi-sieve-pore well, so that the transverse dispersion and mixing of repairing feather are increased, the repairing efficiency of underground water is further improved, and a better underground water repairing effect can be obtained under the condition of low investment cost.
As shown in fig. 1, the aquifer porous medium is sand, the high-permeability porous medium is gravel, the permeability of the high-permeability porous medium is higher than that of the aquifer, the sand layer 3 and the gravel layer 4 are distributed at intervals along the height direction of the multi-sieve-hole well 2, and the permeability of the high-permeability porous medium is greater than that of the aquifer porous medium.
The sand stone layer 3 and the gravel layer 4 are filled by the following method:
(1) and acquiring geological parameters of the aquifer 1 polluted area to be repaired, including soil porosity, permeability coefficient and the like.
(2) Determining the porosity, permeability coefficient and size of the sand layer 3 and the gravel layer 4 according to geological parameters and the structure of the multi-screen well 2 (including the height of the screen hole area 202, the height of a well wall and the like), wherein the porosity of the sand layer 3 and the gravel layer 4 is similar to the porosity of a polluted area of the aquifer 1 to be repaired; the permeability coefficient of the sandstone layer 3 is similar to that of the polluted area of the aquifer 1 to be repaired; under the condition of ensuring the safe and stable structure of the multi-screen well 2, the permeability coefficient of the gravel layer 4 is as large as possible, and the permeability of the gravel layer 4 is ensured to be larger than that of the sand layer 3.
The filling thickness of the gravel layer 4 is determined by the well wall structure of the multi-screen well 2, and the filling length is as large as possible under the premise of considering the construction difficulty and the engineering cost. The groundwater remediation efficiency under to different gravel layer 4 thickness has been calculated according to numerical simulation, can obtain under high promotion remediation rate, the ratio range of gravel layer 4 thickness and 2 wall of a well height of multi-screen hole well, and to the simulation of packing thickness, when the wall of a well height of multi-screen hole well 2 was 0.023m, gravel layer 4 was when 0.01-0.02 m, the remediation efficiency of promotion was all higher, more than 50%, and 0.015m efficiency is the highest. Thus, the thickness of the gravel layer 4 may be selected according to efficiency enhancement requirements. Since the gravel layer 4 is filled in the center of the screen area 202 of the multi-screen well 2 in this embodiment, the gravel packing thickness is selected such that the gravel packing thickness of each layer is the thickness between two adjacent gravel layers 4. Therefore, the filling thickness of the gravel layer 3 is determined by the filling thickness of the gravel layer 4, and the filling length is the same as that of the gravel layer 4.
(3) The vertical arrangement of the sand layer 3 and the gravel layer 4 is selected to be an optimal arrangement combination form, gravel is filled outside the central position of the adjacent screen hole area 202, and sand is filled in other areas outside the well wall.
As shown in fig. 2, the length × height of the model of the aquifer 1 to be repaired is 0.60m × 0.24m, and four typical positions (positions 1 to 4) around the multi-screen well 2 are selected to fill the gravel layer to create the heterogeneous geological condition, and the length × height of the gravel layer 4 is 0.05m × 0.01 m. The screen hole area 202 and the impervious area 201 on the left side of the model of the multi-screen hole well 2 are respectively and continuously injected with the repair liquid and the polluted underground water, the width of the screen hole area 202 is set to be 0.01m, and the width of the impervious area 201 is set to be 0.023 m. The permeability coefficient of the aquifer 1 to be restored is set to 2.5X 10-3m/s, the permeability coefficient of the sand layer 3 is set to 2.5X 10-3m/s, permeability coefficients of the gravel layer 4 were set to 2.5X 10, respectively-1m/s and 2.5X 10-2m/s, the porosity was set to 0.4. Experiment knotThe following fruits were obtained:
compared to the solute plume distribution of the homogeneous geological conditions in fig. 3a, artificially setting the heterogeneous geological conditions around the multi-meshed well 2 may cause the accumulation and streaming of the remediation plumes injected from the mesh region 202 of the well wall of the multi-meshed well 2, as shown in fig. 3 b.
As shown in FIG. 4, when the gravel layer 4 is positioned at the center of the adjacent screen area 202 (i.e., position 2 of FIG. 2), the permeability coefficient is 2.5X 10-1And when the water is m/s, the groundwater remediation efficiency is improved to the highest degree, and the value is 51.64%. It follows that in order to increase the efficiency of the repair, gravel 4 should be packed in the middle of the adjacent screen area 202 and the permeability coefficient of the gravel layer 4 should be as large as possible given that the permeability coefficient of the gravel layer 3 is the same as that of the aquifer 1 to be repaired.
As shown in fig. 5, when the width of the mesh area 202 is 0.01m and the width of the impermeable area 201 is 0.023m, the size of the gravel layer 4 is changed, when the length is 0.05m, the thickness is changed, and when the thickness is 0.015m, the groundwater remediation efficiency is improved to the maximum; when the thickness is 0.015m, the length is changed, and when the length is 0.1m, the groundwater remediation efficiency is improved to the maximum extent.
Fig. 6(a) is a graph showing the improvement efficiency of changing the mesh pitch at position 1; fig. 6(b) is a graph of the improvement efficiency of changing the mesh spacing at position 2, where it can be seen that changing the width of the impermeable zone 201 of the multi-mesh well 2, i.e. changing the injection spacing I, will change the remediation efficiency. Compared with the existing in-situ multi-mesh well with the optimal injection interval of 0.023m, the multi-mesh well repairing liquid injection interval is required to be increased due to the existence of heterogeneous porous media outside the well wall.
According to the invention, by artificially manufacturing heterogeneous geological conditions outside the well wall of the multi-mesh well, the repairing feathers conveyed to the aquifer through the multi-mesh well can be promoted to gather and flow around, so that the transverse dispersion and mixing of the repairing feathers are effectively enhanced, and the groundwater repairing efficiency is economically and efficiently improved.
Claims (8)
1. The utility model provides an improve structure of many sieve mesh wells groundwater remediation efficiency, its characterized in that, is including setting up many sieve mesh well (2) in waiting to restore aquifer (1), the wall of a well interval of many sieve mesh well (2) is provided with a plurality of not permeable areas (201) and sieve mesh district (202), and the wall of a well outside of many sieve mesh well (2) is equipped with porous medium region, porous medium region include that first medium is regional and second medium is regional, wherein, the regional interval of first medium and second medium sets up, first medium region just to not permeable area (201), all the other regions fill the second medium.
2. A structure for improving groundwater remediation efficiency from a multi-mesh well as claimed in claim 1 wherein the first region of media has a higher permeability than the second region of media.
3. A structure for improving groundwater remediation efficiency from a multi-mesh well as claimed in claim 1 or claim 2 wherein the first medium region has a thickness not greater than the thickness of the impermeable zone (201).
4. A structure for improving groundwater remediation efficiency of a multi-mesh well as claimed in claim 1 or claim 2, wherein the first medium region and the second medium region are spaced apart in the height direction of the multi-mesh well (2).
5. The structure for improving groundwater remediation efficiency of a multi-screen well as claimed in claim 4, wherein the first medium region and the second medium region are filled by a filling method comprising:
(1) acquiring geological parameters of a polluted area of an aquifer to be repaired;
(2) determining the porosity, permeability coefficient and size of the first medium region and the second medium region according to the geological parameters and the structure of the multi-sieve-hole well;
(3) and filling a first medium in the area outside the well wall opposite to the impermeable area, and filling a second medium in the areas outside other well walls.
6. A structure for improving groundwater remediation efficiency of a multi-screen well according to claim 5, wherein the geological parameters of the aquifer (1) contaminated area to be remediated include soil porosity and permeability coefficient.
7. A structure for improving groundwater remediation efficiency as claimed in claim 5 wherein the first medium is a porous medium with a permeability higher than that of the aquifer.
8. A structure for improving groundwater remediation efficiency as claimed in claim 5 wherein the second medium is an aquifer porous medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111060171.XA CN113718855B (en) | 2021-09-10 | 2021-09-10 | Structure for improving efficiency of repairing underground water by multi-sieve-mesh well |
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| CN202111060171.XA CN113718855B (en) | 2021-09-10 | 2021-09-10 | Structure for improving efficiency of repairing underground water by multi-sieve-mesh well |
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| CN113718855B CN113718855B (en) | 2022-11-11 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107127211A (en) * | 2017-05-27 | 2017-09-05 | 中科鼎实环境工程股份有限公司 | Pollutant site remediation system and method based on regional pollution amount |
| CN108147551A (en) * | 2017-12-13 | 2018-06-12 | 同济大学 | A kind of two-way blocking repair system in situ of phreatic water polluted by nitrogen migration |
| CN108655169A (en) * | 2018-05-24 | 2018-10-16 | 吉林大学 | Soil repair system based on colloidal state microfoam and restorative procedure |
| CN112775168A (en) * | 2020-12-08 | 2021-05-11 | 河海大学 | System and method for repairing underground water by using in-situ segmented sieve well |
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2021
- 2021-09-10 CN CN202111060171.XA patent/CN113718855B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107127211A (en) * | 2017-05-27 | 2017-09-05 | 中科鼎实环境工程股份有限公司 | Pollutant site remediation system and method based on regional pollution amount |
| CN108147551A (en) * | 2017-12-13 | 2018-06-12 | 同济大学 | A kind of two-way blocking repair system in situ of phreatic water polluted by nitrogen migration |
| CN108655169A (en) * | 2018-05-24 | 2018-10-16 | 吉林大学 | Soil repair system based on colloidal state microfoam and restorative procedure |
| CN112775168A (en) * | 2020-12-08 | 2021-05-11 | 河海大学 | System and method for repairing underground water by using in-situ segmented sieve well |
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