CN113753981A - Fourth series underground water and soil pollution treatment method - Google Patents
Fourth series underground water and soil pollution treatment method Download PDFInfo
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- CN113753981A CN113753981A CN202111094149.7A CN202111094149A CN113753981A CN 113753981 A CN113753981 A CN 113753981A CN 202111094149 A CN202111094149 A CN 202111094149A CN 113753981 A CN113753981 A CN 113753981A
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- 238000003911 water pollution Methods 0.000 title description 6
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- 238000012360 testing method Methods 0.000 claims abstract description 30
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/14—Obtaining and confining water by means of wells by means of horizontal or oblique wells
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/06—Methods or installations for obtaining or collecting drinking water or tap water from underground
- E03B3/08—Obtaining and confining water by means of wells
- E03B3/16—Component parts of wells
- E03B3/18—Well filters
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/32—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river
- E03B3/34—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river of underground water
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/406—Aquifer recharge
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Abstract
The invention belongs to the field of groundwater and soil pollution treatment, and discloses a fourth system groundwater and soil pollution treatment method. The main technical characteristics are as follows: roughly estimating a pollution boundary according to a ground pollution source, a groundwater runoff direction and pollution time; drilling exploration holes and determining a pollution boundary; constructing a testing recharge well at the edge of the polluted site, testing the groundwater influence radius R of the recharge well, drilling the recharge well at the position away from the groundwater influence radius R outside the boundary of the polluted site, wherein the interval between adjacent recharge wells is less than 2R, and constructing a horizontal well, wherein the interval between horizontal wells is not more than the groundwater influence radius R, a water filter pipe of the horizontal well is constructed to be close to a water-resisting layer surface according to the stratum condition, and the length covers the whole polluted area; and digging a water storage tank on the ground surface in the determined polluted area, recharging clean water into the recharging well, and simultaneously pumping out and treating the polluted water in the polluted area through the horizontal well. The treatment is more thorough, and the damage of surrounding buildings caused by the drop of the underground water level is avoided.
Description
Technical Field
The invention belongs to the technical field of environmental pollution treatment, and particularly relates to a method for treating fourth-line underground water and soil pollution.
Background
The fourth era is the second era of the new generation. The formation formed by the quaternary is called the fourth system, the deposit distribution of the fourth system is very wide, and the world is almost covered by the quaternary deposits everywhere except for the steep hillside where the rock is exposed. The fourth series of deposits formed later, were mostly unconsolidated and were kept intact. The fourth series of deposition mainly comprises glacier deposition, river deposition, lake deposition, aeolian deposition, cave deposition, sea deposition and the like. And the second is ice water deposition, residual deposition, slope deposition, flood deposition, biological deposition, volcanic deposition and the like.
The soil is a loose surface layer which has certain fertility and can grow plants on the surface of the earth, is a link connecting inorganic world and organic world, is an important natural resource for human survival, and is an important component of the earth environment. Groundwater and soil pollution are phenomena in which the quality of groundwater deteriorates due to human factors. The causes of groundwater and soil pollution are mainly: industrial wastewater is directly discharged underground, contaminated surface water invades into underground aquifers, human and animal excreta or water contaminated by excessive use of pesticides permeates underground, and the like. As a result of the contamination, the contents of harmful components such as phenol, chromium, mercury, arsenic, radioactive substances, bacteria, organic substances, etc. in the groundwater are increased. The polluted underground water is harmful to human health and industrial and agricultural production.
The existing underground water and soil pollution treatment technology mainly comprises the following methods:
first, physical method
1. The shielding method is that various physical barriers are built underground, polluted buckets are enclosed to prevent further diffusion and spread of pollutants, and common mortar curtain methods, slurry water-blocking walls, vibrating pile water-blocking walls and the like are adopted only for treating small-range extremely toxic and difficultly-degradable pollutants;
2. a passive collection method, wherein a channel with enough depth is dug at the downstream of underground water flow, and a collection system is fully distributed in the channel to collect pollutants;
second, in situ treatment
Injecting chemical reagent into polluted water to degrade organic matter or form inorganic compound precipitate;
third, extraction treatment method
Pumping out the polluted underground water and then carrying out centralized treatment.
The pumping treatment method is a method which is widely applied at present, the existing pumping treatment method adopts one or more vertical pumping wells, and the method has the following defects: firstly, one or more vertical pumping wells are adopted according to different areas, and due to the influence of the radius R of underground water, the well digging cost is increased, and dead angles for treatment exist; as shown in fig. 1, which is a schematic view of sewage treatment by a conventional pipe well pumping method, a pumping well 1 cannot penetrate a water-resisting layer 2. Because the depth of the recharge well does not penetrate through the water-resisting layer 2, the recharge well is influenced by the radius of the pipe well in the precipitation extraction process, an unaffected area 3 is formed between two adjacent pumping wells and is close to the lower part, and the polluted water at the position cannot be pumped out of the ground for treatment; secondly, when the polluted underground water is pumped, water outside the polluted area is sucked, the water level of the underground water is lowered, the geological structure of the outside area is changed, collapse can happen in severe cases, and accidents such as collapse of the ground buildings and the like are easy to happen when the ground buildings exist outside the polluted area.
Disclosure of Invention
The invention aims to solve the technical problem of providing a fourth system groundwater and soil pollution treatment method which can treat more thoroughly and avoid uneven settlement of buildings caused by the decrease of groundwater level at the periphery.
In order to solve the problems, the fourth system groundwater and soil pollution treatment method adopts the technical scheme that: the method comprises the following steps:
first, the estimation of the contamination boundary
Roughly estimating a pollution boundary according to a ground pollution source, a groundwater runoff direction and pollution time;
second, exploratory hole is drilled to determine the pollution boundary
Drilling a survey hole at the presumed contamination boundary based on the presumed contamination boundary and the ground construction conditions, the survey hole leaving the ground construction if there is a ground construction at the presumed boundary; measuring water quality through the exploratory hole; if the water quality in the exploration hole is polluted, continuously drilling the exploration hole to the outer side under the condition that no ground building exists until the water quality is not polluted, determining that the position is a polluted boundary, finding out the stratum structure of the area at the moment, finding out the position of the impermeable water-resisting layer, and if the exploration hole penetrates through the impermeable water-resisting layer deeply, sealing the hole;
thirdly, constructing a recharge well
Constructing a testing recharging well at the edge of the polluted site, testing a full-hole water filtering pipe of the recharging well, filling gravel materials from the bottom of the well to the wellhead, performing a water pumping test after the well is formed, obtaining an underground water influence radius R of the testing recharging well according to the water pumping test, marking the position of the recharging well at the underground water influence radius R away from the outer side of the boundary of the polluted site when no building exists outside the polluted region and the polluted region R, enabling the interval between adjacent recharging wells to be smaller than 2 times of the underground water influence radius R, then driving the recharging well according to the marked position of the recharging well, filling the full-hole water filtering pipe of the recharging well, and filling the gravel materials from the bottom of the well to the wellhead; when buildings are in the polluted area and the influence radius R range of underground water outside the polluted area, the position of the recharge well is more than 2 meters away from the buildings;
fourthly, constructing a horizontal well
Calculating the spacing and the number of horizontal wells according to the determined pollution boundary and the testing recharge well pumping groundwater influence radius R, wherein the spacing of the horizontal wells is not more than the groundwater influence radius R, the horizontal section of the horizontal well is a water filter pipe, the water filter pipe of the horizontal well is constructed by being tightly attached to a water-resisting layer according to the stratum condition, and the length of the water filter pipe covers the whole pollution area;
fifthly, digging a water storage tank on the ground surface in the determined pollution area,
digging a water storage tank on the ground surface in the determined pollution area, and putting clear water into the water storage tank;
sixthly, pumping out the polluted water in the polluted area through the horizontal well while recharging clean water into the recharging well and treating the polluted water
Recharging clear water into the recharging well, pumping the polluted underground water out of the ground through the horizontal well, and then treating the polluted underground water by a physical method, a chemical method, a biological method and other treatment methods;
seventhly, sealing the recharging well and recovering the site
After the polluted site is treated, the recharge well and the horizontal well are sealed to prevent secondary pollution of underground water through the recharge well.
As a further improvement, the fifth step is to pump out the polluted water in the polluted area through a horizontal well and treat the polluted water, and the treated harmless water is put into the water storage tank again;
a detection water drainage port is arranged at the water outlet of the horizontal well, the detection water drainage port is connected with a sewage detection mechanism, and the horizontal well is stopped pumping water when the sewage detected by the sewage detection mechanism meets the requirement;
the horizontal well is a unidirectional horizontal well;
the horizontal well is a bidirectional horizontal well.
Compared with the prior art, the fourth-system underground water and soil pollution treatment method provided by the invention has the following advantages: firstly, the method comprises the following steps:
step one, roughly estimating a pollution boundary according to a ground pollution source, a groundwater runoff direction and pollution time; secondly, drilling exploration holes at the presumed pollution boundary according to the presumed pollution boundary and the ground building condition, and if ground buildings exist at the presumed boundary, the exploration holes leave the ground building; measuring water quality through the exploratory hole; if the water quality in the exploration hole is polluted, continuously drilling the exploration hole to the outer side under the condition that no ground building exists until the water quality is not polluted, determining that the position is a polluted boundary, finding out the stratum structure of the area at the moment, finding out the position of the impermeable water-resisting layer, and if the exploration hole penetrates through the impermeable water-resisting layer deeply, sealing the hole; thirdly, constructing a testing recharging well at the edge of the polluted site, testing the full-hole water filtering pipe of the recharging well, filling gravel materials from the bottom of the well to the top of the well, performing a water pumping test after the well is formed, obtaining the underground water influence radius R of the testing recharging well according to the water pumping test, marking the position of the recharging well at the underground water influence radius R away from the outer side of the boundary of the polluted site when no building exists in the polluted area and the polluted area R, enabling the interval between adjacent recharging wells to be smaller than 2 times of the underground water influence radius R, then driving the recharging well according to the marked position of the recharging well, filling the full-hole water filtering pipe of the recharging well, and filling the gravel materials from the bottom of the well to the top of the well; when buildings are in the polluted area and the influence radius R range of underground water outside the polluted area, the position of the recharge well is more than 2 meters away from the buildings; fourthly, calculating the spacing and the number of horizontal wells according to the determined pollution boundary and the testing recharge well pumping groundwater influence radius R, wherein the spacing of the horizontal wells is not larger than the groundwater influence radius R, the horizontal section of the horizontal well is a water filter pipe, the water filter pipe of the horizontal well is constructed by being tightly attached to a water-resisting layer according to the stratum condition, and the length of the water filter pipe covers the whole pollution area; fifthly, digging a water storage tank on the ground surface in the determined pollution area, and putting clear water into the water storage tank; sixthly, recharging clear water into the recharging well, pumping the polluted underground water out of the ground through the horizontal well, and then treating the polluted underground water by a physical method, a chemical method, a biological method and other treatment methods; and seventhly, after the polluted site is treated, sealing the recharge well and the horizontal well to prevent secondary pollution of underground water through the recharge well: 1. a recharge well is constructed in the polluted area, and the recharge well can guarantee that geological disasters such as uneven ground settlement and the like cannot be caused when underground water is pumped in the polluted area; 2. the polluted area utilizes the horizontal well to extract polluted underground water, and then the underground water is treated on the ground, so that the production efficiency is greatly improved; 3. digging a water storage tank on the plane of the polluted area and putting clean water into the water storage tank, so that the polluted water body can be diluted, a water-containing layer can be washed, and the circulating flow of underground water can be accelerated, thereby shortening the restoration time of the underground water; 4. eluting and cleaning pollutants in soil by water, solution containing a treating agent or a surfactant and the like under the action of gravity by using a leaching technology, collecting the cleaned wastewater through a lower horizontal pipe, and sucking by a water pump to remove the wastewater from the ground for water treatment; 5. the horizontal well directly collects underground water on a water-resisting layer of a polluted area, and an area which cannot be treated cannot appear; secondly, as the fifth step is to pump out the polluted water in the polluted area through the horizontal well and carry out the treatment step, the treated harmless water is put into the water storage tank again; the detection water drainage port is arranged at the water outlet of the horizontal well, the detection water drainage port is connected with the sewage detection mechanism, when the sewage detected by the sewage detection mechanism reaches a requirement, the horizontal well is stopped from pumping water, the wastewater extracted from the horizontal well is treated and then led into the water storage tank, the water in the water storage tank rapidly permeates to the lower part due to the self gravity and the negative pressure generated after underground water is pumped out, in the underwater seepage process after treatment, the residual harmful substances in the soil can be effectively discharged until the water pumped out from the water outlet of the horizontal well is qualified through the detection mechanism, and the use is more convenient.
Drawings
FIG. 1 is a schematic view of a conventional tubular well pumping method for treating sewage;
FIG. 2 is a schematic view of groundwater and soil contamination area estimation;
FIG. 3 is a schematic view of the construction of a recharge well;
FIG. 4 is a floor plan;
FIG. 5 is a schematic diagram of bi-directional horizontal well construction;
FIG. 6 is a schematic view of a unidirectional horizontal well;
FIG. 7 is a schematic view of a horizontal well pumping out contaminated water.
Detailed Description
The structure and the use principle of the construction method of the sandstone-type water-yielding geothermal well and the recharging well are further described in detail with reference to the attached drawings and the specific implementation mode.
FIG. 2 is a schematic diagram of the estimation of groundwater and soil pollution area; the water polluted by the pollution source 4 permeates into the topsoil 5, the silt layer 6 and the silt layer 7, the infiltration path is blocked by the water-resisting layer 2, and the polluted area deviates in the runoff direction of the pollution source 4 under the influence of the runoff direction of the underground water. The top surface of the water-resisting layer 2 is determined through exploration, a pollution area 15 is determined, and a pollution boundary is roughly estimated according to a ground pollution source, the direction of groundwater runoff and pollution time.
As shown in fig. 3, a schematic diagram of a recharging well construction is shown, polluted groundwater is treated by a pumping-out method, in order to prevent the polluted site underground polluted water from pumping out and causing uneven and settlement of surrounding buildings 8, a testing recharging well 9 is firstly constructed at the edge of the polluted site, a full-hole water filter pipe and a full-hole gravel filler of the recharging well are tested, the testing recharging well 9 is recharged all the time during pumping water in the polluted area, the water level 10 outside the polluted area is ensured to be constant, and a water level line 11 in the polluted area is in an inverted cone shape. And (3) performing a water pumping test after the well is formed, acquiring groundwater influence radius R data according to the water pumping test, marking the position of the recharge well at the position of the groundwater influence radius R away from the outer side of the pollution site boundary according to the influence radius data, wherein the interval between adjacent recharge wells is less than 2R, and then driving the recharge well 12 according to the marked position of the recharge well.
As shown in fig. 4, is a floor plan; the recharging wells 12 are uniformly arranged on the periphery of the polluted area, the distance L2 between the adjacent recharging wells is less than or equal to 2R, the distance L1 between the recharging wells and the boundary of the polluted area is greater than or equal to R, and the distance L between the two adjacent horizontal wells is less than or equal to R to achieve the best effect.
As shown in fig. 5, which is a schematic diagram of the construction of a bidirectional horizontal well, in a polluted area 15 surrounded by a recharging well 12, the outer edge of the polluted area is constructed with the bidirectional horizontal well 13, the horizontal section of the horizontal well clings to a water-resisting layer 1, the horizontal water filter pipe of the horizontal well covers the whole polluted area, and the vertical section of the horizontal well 13 is used for placing a water pump.
As shown in fig. 6, a construction diagram of a unidirectional horizontal well is shown. In a pollution area 15 surrounded by the recharge well 12, a unidirectional horizontal well 14 is constructed at the outer edge of the pollution area, the horizontal section of the unidirectional horizontal well 14 is tightly attached to the water-resisting layer 1, the horizontal water filter pipe of the horizontal well covers the whole pollution area, and the vertical section of the unidirectional horizontal well 14 is used for placing a water pump.
As shown in fig. 7, a schematic diagram of sewage treatment by pumping out of a horizontal well is shown, a water seepage tank 16 is excavated above a polluted area 15, during the pumping of the horizontal well 13, water, a solution containing a treating agent, a surfactant and the like are eluted and cleaned by gravity from soil by using a leaching technology, the cleaned wastewater is collected by the lower horizontal well 13, and the wastewater is pumped by a water pump to be discharged to the ground for water treatment.
As shown in fig. 7, a detection water drainage port 17 is arranged at the water outlet 19 of the horizontal well 13, and the detection water drainage port 17 is connected with a sewage detection mechanism 18.
The fourth series underground water and soil pollution treating process includes the following steps:
first, the estimation of the contamination boundary
Roughly estimating a pollution boundary according to the ground pollution source 4, the groundwater runoff direction and the pollution time;
second, exploratory hole is drilled to determine the pollution boundary
Drilling a survey hole at the presumed contamination boundary based on the presumed contamination boundary and the ground construction conditions, the survey hole leaving the ground construction if there is a ground construction at the presumed boundary; measuring water quality through the exploratory hole; if the water quality in the exploration hole is polluted, continuously drilling the exploration hole to the outer side under the condition that no ground building exists until the water quality is not polluted, determining that the position is a polluted boundary, finding out the stratum structure of the area at the moment, finding out the position of the impermeable water-resisting layer, and if the exploration hole penetrates through the impermeable water-resisting layer deeply, sealing the hole;
thirdly, constructing a recharge well
Constructing a testing recharging well 9 at the edge of the polluted site, testing a full-hole water filtering pipe of the recharging well, filling gravel materials from the bottom of the well to the top of the well, performing a water pumping test after the well is formed, obtaining an underground water influence radius R of the testing recharging well according to the water pumping test, marking the position of the recharging well at the underground water influence radius R away from the outer side of the boundary of the polluted site when no building 8 exists outside the polluted region and the polluted region R, wherein the interval between adjacent recharging wells is less than 2 times of the underground water influence radius R, then according to the marked position of the recharging well 12, punching the recharging well 12, and filling the full-hole water filtering pipe of the recharging well 12, wherein the gravel materials are filled from the bottom of the well to the top of the well; when a building 8 is in the polluted area and the influence radius R range of underground water outside the polluted area, the position of the recharge well is more than 2 meters away from the building;
fourthly, constructing a horizontal well
Calculating the spacing and the number of horizontal wells according to the determined pollution boundary and the groundwater influence radius R measured by pumping water from the test recharge well 9, wherein the spacing of the horizontal wells 13 is not more than the groundwater influence radius R, the horizontal section of the horizontal well is a water filter pipe, the water filter pipe of the horizontal well 13 is constructed by clinging to a water-resisting layer according to the stratum condition, and the length of the water filter pipe covers the whole pollution area;
fifthly, digging a water storage tank on the ground surface in the determined pollution area,
digging a water storage tank 16 on the ground in the determined pollution area 15, and putting clean water into the water storage tank 16;
sixthly, pumping out the polluted water in the polluted area through the horizontal well while recharging clean water into the recharging well and treating the polluted water
Recharging clean water into the recharging well 12, pumping the polluted underground water out of the ground through the horizontal well, and then treating the polluted underground water by a physical method, a chemical method, a biological method and other treatment methods;
seventhly, sealing the recharging well and recovering the site
After the polluted site is treated, the recharge well and the horizontal well are sealed to prevent secondary pollution of underground water through the recharge well.
As a further improvement, the polluted water in the polluted area is pumped out through the horizontal well and treated, and the treated harmless water is put into the water storage tank 16 again;
a detection water drainage port 17 is arranged at the water outlet of the horizontal well 13, the detection water drainage port 17 is connected with a sewage detection mechanism 18, and when the sewage detected by the sewage detection mechanism 18 meets the requirement, the horizontal well stops pumping water.
The scope of the present invention is not limited to the above-described embodiments, and is within the scope of the present invention as long as the method is the same or similar in structure to the fourth groundwater and soil pollution treatment method of the present invention.
Claims (4)
1. The fourth series groundwater and soil pollution treatment method is characterized in that: the method comprises the following steps:
first, the estimation of the contamination boundary
Roughly estimating a pollution boundary according to a ground pollution source, a groundwater runoff direction and pollution time;
second, exploratory hole is drilled to determine the pollution boundary
Drilling a survey hole at the presumed contamination boundary based on the presumed contamination boundary and the ground construction conditions, the survey hole leaving the ground construction if there is a ground construction at the presumed boundary; measuring water quality through the exploratory hole; if the water quality in the exploration hole is polluted, continuously drilling the exploration hole to the outer side under the condition that no ground building exists until the water quality is not polluted, determining that the position is a polluted boundary, finding out the stratum structure of the area at the moment, finding out the position of the impermeable water-resisting layer, and if the exploration hole penetrates through the impermeable water-resisting layer deeply, sealing the hole;
thirdly, constructing a recharge well
Constructing a testing recharging well at the edge of the polluted site, testing a full-hole water filtering pipe of the recharging well, filling gravel materials from the bottom of the well to the wellhead, performing a water pumping test after the well is formed, obtaining an underground water influence radius R of the testing recharging well according to the water pumping test, marking the position of the recharging well at the underground water influence radius R away from the outer side of the boundary of the polluted site when no building exists outside the polluted region and the polluted region R, enabling the interval between adjacent recharging wells to be smaller than 2 times of the underground water influence radius R, then driving the recharging well according to the marked position of the recharging well, filling the full-hole water filtering pipe of the recharging well, and filling the gravel materials from the bottom of the well to the wellhead; when buildings are in the polluted area and the influence radius R range of underground water outside the polluted area, the position of the recharge well is more than 2 meters away from the buildings;
fourthly, constructing a horizontal well
Calculating the spacing and the number of horizontal wells according to the determined pollution boundary and the testing recharge well pumping groundwater influence radius R, wherein the spacing of the horizontal wells is not more than the groundwater influence radius R, the horizontal section of the horizontal well is a water filter pipe, the water filter pipe of the horizontal well is constructed by being tightly attached to a water-resisting layer according to the stratum condition, and the length of the water filter pipe covers the whole pollution area;
fifthly, digging a water storage tank on the ground surface in the determined pollution area,
digging a water storage tank on the ground surface in the determined pollution area, and putting clear water into the water storage tank;
sixthly, pumping out the polluted water in the polluted area through the horizontal well while recharging clean water into the recharging well and treating the polluted water
Recharging clear water into the recharging well, pumping the polluted underground water out of the ground through the horizontal well, and then treating the polluted underground water by a physical method, a chemical method, a biological method and other treatment methods;
seventhly, sealing the recharging well and recovering the site
After the polluted site is treated, the recharge well and the horizontal well are sealed to prevent secondary pollution of underground water through the recharge well.
2. A fourth series groundwater and soil pollution treatment method as claimed in claim 1, wherein:
the fifth step of pumping out the polluted water in the polluted area through a horizontal well and treating the polluted water, and putting the treated harmless water into the water storage tank again;
the water outlet of the horizontal well is provided with a detection water drainage port which is connected with a sewage detection mechanism, and when the sewage detected by the sewage detection mechanism reaches the requirement, the horizontal well stops pumping water.
3. A fourth series groundwater and soil pollution treatment method as claimed in claim 1 or 2, wherein: the horizontal well is a unidirectional horizontal well.
4. A fourth series groundwater and soil pollution treatment method as claimed in claim 1 or 2, wherein: the horizontal well is a bidirectional horizontal well.
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