CN112893431A - Leaching extraction treatment method and system for loose stratum land block pollution - Google Patents
Leaching extraction treatment method and system for loose stratum land block pollution Download PDFInfo
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- CN112893431A CN112893431A CN202110271680.0A CN202110271680A CN112893431A CN 112893431 A CN112893431 A CN 112893431A CN 202110271680 A CN202110271680 A CN 202110271680A CN 112893431 A CN112893431 A CN 112893431A
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- 238000002386 leaching Methods 0.000 title claims abstract description 65
- 238000000605 extraction Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 200
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 66
- 231100000719 pollutant Toxicity 0.000 claims abstract description 66
- 238000005273 aeration Methods 0.000 claims abstract description 45
- 238000012544 monitoring process Methods 0.000 claims abstract description 37
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 230000005012 migration Effects 0.000 claims abstract description 11
- 238000013508 migration Methods 0.000 claims abstract description 11
- 239000003673 groundwater Substances 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000011109 contamination Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 17
- 239000002689 soil Substances 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a leaching extraction treatment method and a leaching extraction treatment system for loose stratum plot pollution, wherein in a pollution area of the loose stratum plot, the leaching water quantity is increased manually, the mobility of pollutants in an aeration zone is increased, the migration of the pollutants in the aeration zone to underground water is accelerated, and the pollutants in the pollution aeration zone which are difficult to treat are leached to the underground water; and pumping the leached underground water containing the pollutants out of the polluted area and the downstream area in the underground water flow direction through an underground water monitoring well. The invention increases the leaching water amount in a manual mode, accelerates the transportation of the aeration zone pollutants to the underground water through the leaching action, so that the polluted aeration zone pollutants which are difficult to treat are leached into the underground water, the pollutants are easy to treat and low in treatment cost, and simultaneously, the repeated pollution of water quality caused by the fact that the pollutants in the aeration zone are dissolved and separated out and enter the underground water again due to the rising of the water level of the underground water or rainfall is effectively avoided.
Description
Technical Field
The invention relates to the technical field of environmental engineering, in particular to a leaching extraction treatment method and a leaching extraction treatment system for loose stratum land parcel pollution.
Background
At present, pollutants in a chemical industrial park in a unconsolidated stratum often leak and leak vertically through an aeration zone, are firstly adsorbed and intercepted by soil in the aeration zone in the infiltration process, and are then continuously transported downwards to enter underground water after being adsorbed to saturation, the pollutants entering the underground water are often pumped out and treated, but the treatment effect is only limited to the pollutants entering the underground water, and the pollutants in the aeration zone are dissolved and separated out to enter the underground water again when the water level of the underground water rises or the surface water is leached, so that the water quality of the underground water in an affected area is repeatedly deteriorated, the pollution treatment time is prolonged, and meanwhile, for the stratum with poor water-rich property, the aim of artificially increasing the water inflow is fulfilled by leaching, so that effective pumping treatment is realized; the pollutants intercepted by the aeration zone are usually treated by soil replacement, the cost is high, and due to the evaporation and adsorption effects of the pollutants in the underground water in the transportation process, the pollution with a relatively light degree but a larger influence range of the downstream aeration zone is usually caused, and the partial pollution is extremely difficult to carry out large-area soil replacement.
Disclosure of Invention
In order to overcome the technical problems in the background art, the invention provides a leaching extraction treatment method and a leaching extraction treatment system for loose stratum land parcel pollution.
The technical scheme adopted by the invention for solving the technical problems is as follows: a leaching extraction treatment method for loose stratum plot pollution is characterized in that in a pollution area of the loose stratum plot, leaching water quantity is increased manually, the mobility of pollutants in an aeration zone is increased, the migration of the pollutants in the aeration zone to underground water is accelerated, and pollutants in the aeration zone which are difficult to treat are leached into the underground water; and pumping the leached underground water containing the pollutants out of the polluted area and the downstream area in the underground water flow direction through an underground water monitoring well.
The invention accelerates the migration of pollutants in the aeration zone to the underground water through the leaching effect, thereby converting the pollution aeration zone which is difficult to treat into the polluted underground water which is easy to treat for treatment, having low pollution treatment cost and high treatment speed, and simultaneously avoiding the repeated pollution of the underground water quality caused by the dissolution and precipitation of the pollutants in the aeration zone into the underground water again due to the rising of the underground water level or the rainfall.
Further, the treatment method of the invention comprises the following specific steps:
A. arranging a water conveying pipe in a pollution area of a unconsolidated formation plot to increase the leaching water quantity, increase the mobility of pollutants in an aeration zone, accelerate the migration of the pollutants in the aeration zone to underground water, and leach the pollutants in the aeration zone which are difficult to treat into the underground water;
B. and pumping the leached underground water containing the pollutants out through the underground water monitoring wells by utilizing the existing or additionally arranged underground water monitoring wells in the polluted area and the downstream area in the underground water flow direction.
Preferably, the water level descending area of the descending funnel formed by pumping the groundwater monitoring well covers the pollution area and the secondary pollution area, the range of the pollution area is controlled, the pollution area is prevented from being enlarged, and pollutants are effectively leached and pumped out in the controllable area.
Preferably, the setting depth of the underground water monitoring well is as follows: more than 1m of filter pipes are positioned above the water level in the abundant water period of the underground water, more than 1m of filter pipes are positioned below the water level in the dry water period of the underground water, and the underground water containing pollutants can be effectively pumped all the year round.
Preferably, the leaching water can be added with edible surfactant to enhance the dissolving effect on pollutants, realize more effective leaching effect and simultaneously achieve the purpose of treating polluted soil and underground water,
the invention also provides a leaching and pumping treatment system for loose stratum plot pollution, which comprises a leaching system distributed in a pollution area of the loose stratum plot and an extraction system distributed in the pollution area and a downstream area of the pollution area in the groundwater flow direction;
the leaching system includes: the water delivery pump, the water delivery pipe and the spray pipe connected with the water delivery pipe; the extraction system comprises: the water suction pipe of the water suction pump extends into the underground water monitoring well.
Preferably, the water level descending area of the descending funnel formed by pumping the distributed underground water monitoring well covers the pollution area and the secondary pollution area, the range of the pollution area is controlled, the pollution area is limited to be enlarged, and pollutants are effectively leached and pumped out in the controllable area.
Preferably, the setting depth of the underground water monitoring well is as follows: the water level is above 1m in the water-rich period of the underground water and below 1m in the dry period of the underground water, so that the underground water containing pollutants can be effectively pumped all the year round; the underground water monitoring well is internally provided with a water filter pipe, the outer diameter of the water filter pipe is not less than phi 146mm, enough water pumping amount can be kept, and a good effective extraction effect is realized.
Preferably, the water delivery pipe of the leaching system is provided with a regulating valve for regulating water quantity, the water quantity can be regulated according to the concentration of pollutants and the permeability coefficient of the aeration zone, the leaching water quantity is regulated from small to large, the optimal leaching treatment effect is achieved by adopting the underground water pumping treatment capacity of the distributed underground water monitoring wells not to exceed the underground water pumping treatment capacity.
Preferably, the shower pipes of the leaching system are buried in the polluted area shallowly, so that the evaporation of water quantity can be reduced, the leaching quantity is increased, and the leaching is accelerated.
The invention has the beneficial effects that: according to the invention, the leaching water amount is increased in a manual mode in a pollution area, the mobility of pollutants in the aeration zone is increased, the migration of the pollutants in the aeration zone to underground water is accelerated, and the pollutants in the aeration zone which are difficult to treat are leached to the underground water; the pollution treatment cost is low, and the repeated pollution of the groundwater quality caused by dissolving and separating out the pollutants in the aeration zone and then entering the groundwater again due to the rising of the groundwater level or rainfall is effectively avoided.
In the stratum of the area with poor water-rich property, the leaching water quantity is increased on the ground surface in a manual mode, so that effective pollutant extraction treatment is realized to a greater extent;
and a water level descending area of a descending funnel formed by pumping the distributed underground water monitoring well covers the pollution area and the secondary pollution area. The pollution area is prevented from being enlarged, the pollution is effectively leached in the controllable area, and the effect of removing the pollutants is achieved.
The food-grade surfactant can be added into the leaching water in a targeted manner, so that more effective leaching effect is realized, and the aim of simultaneously treating the polluted soil and the underground water is fulfilled.
The method has the advantages of low pollution treatment cost, high treatment efficiency, high treatment speed and no secondary pollution, realizes in-situ remediation of the polluted soil, and has good popularization value.
Drawings
FIG. 1 is a schematic illustration of an embodiment of the present invention;
fig. 2 is a schematic diagram of the system of the present invention.
Parts and numbering in the figures:
1-a leaching system; 2-an extraction system; 11-a spray pipe; 12-a water conveying pipe; 13-a water delivery pump; 21-underground water monitoring well; 22-a water pump; 100-contaminated area; 200-aeration zone; 300-secondary pollution area; 400-water level in the rich water period; 500-water level in dry season.
Detailed Description
The following examples are provided to illustrate a leaching extraction process of loose formation parcel contamination and system therefor, but are not intended to limit the scope of the invention.
The invention provides a leaching extraction treatment method for loose stratum plot pollution, which is characterized in that in a pollution area of the loose stratum plot, the leaching water amount is increased in a manual mode, the mobility of pollutants in an aeration zone is increased, the migration of the pollutants in the aeration zone to underground water is accelerated, and the pollutants in the aeration zone which are difficult to treat are leached into the underground water; and pumping the leached underground water containing the pollutants out of the polluted area and the downstream area in the underground water flow direction through an underground water monitoring well.
The invention accelerates the migration of the pollutants in the aeration zone to the underground water through the leaching effect, thereby converting the pollutants in the aeration zone which is difficult to treat into the polluted underground water which is easy to treat, having low pollution treatment cost and high treatment speed, and simultaneously avoiding the repeated pollution of the water quality of the underground water caused by the dissolution and the separation of the pollutants in the aeration zone into the underground water again due to the rising of the water level of the underground water or rainfall.
The treatment method comprises the following specific steps:
A. arranging a water delivery pipe on the surface of a pollution area of a unconsolidated formation plot to increase the leaching water quantity, increase the mobility of pollutants in an aeration zone, accelerate the migration of the pollutants in the aeration zone to underground water, and leach the pollutants in the aeration zone which are difficult to treat into the underground water;
B. and pumping the leached underground water containing the pollutants out through the underground water monitoring wells by utilizing the existing or additionally arranged underground water monitoring wells in the polluted area and the downstream area in the underground water flow direction.
Preferably, the water level descending area of the descending funnel formed by pumping the groundwater monitoring well covers the pollution area and the secondary pollution area, the range of the pollution area is controlled, the pollution area is prevented from being enlarged, and pollutants are effectively leached and filtered in the controllable area.
Preferably, the setting depth of the underground water monitoring well is as follows: more than 1m of filter pipes are positioned above the water level in the abundant water period of the underground water, more than 1m of filter pipes are positioned below the water level in the dry water period of the underground water, and the underground water containing pollutants can be effectively pumped all the year round.
Preferably, the leaching water can be added with an edible surfactant, so that the dissolving effect on pollutants is enhanced, a more effective leaching effect is realized, and the purpose of simultaneously treating polluted soil and underground water is achieved.
As shown in fig. 1 and 2, the invention also provides a leaching and pumping treatment system for loose stratum plot pollution, which comprises a leaching system 1 distributed in a pollution area 100 of the loose stratum plot and an extraction system 2 distributed in the pollution area 100 and a downstream area of the underground water flow direction;
the leaching system 1 comprises: a water delivery pump 13, a water delivery pipe 12 and a spray pipe 11 connected with the water delivery pipe; the extraction system 2 comprises: the device comprises an underground water monitoring well 21 and a water suction pump 22, wherein a water suction pipe of the water suction pump 22 extends into the underground water monitoring well 21.
Fig. 1 is a schematic view from a top view, fig. 2 is a schematic view of a system structure, and the implementation process is as follows:
A. arranging the water conveying pipe 12 in the pollution area 100 of the unconsolidated formation plot to increase the mobility of pollutants in the aeration zone 200, accelerate the migration of the pollutants in the aeration zone 200 to underground water and leach the pollutants in the pollution aeration zone 200 which are difficult to treat into the underground water;
B. in the polluted region 100 and the groundwater flow direction downstream region thereof, the groundwater monitoring wells 21 are used, which are already or additionally arranged, and the groundwater containing the pollutants which is leached and filtered out is pumped out and treated through the groundwater monitoring wells 21.
The arrow to the right in fig. 1 and 2 indicates the groundwater flow direction.
As shown in fig. 2, a water delivery pipe 12 arranged in the polluted area 100 is connected with a spray pipe 11 and a water delivery pump 13 to form a leaching system 1; in the polluted region 100 and the region downstream in the groundwater flow direction, the groundwater monitoring well 21 and the water pump 22 are arranged to constitute the extraction system 2.
The distributed underground water monitoring well 21 pumps water to form a falling funnel water level descending area which covers the pollution area 100 and the secondary pollution area 300, so that pollution control is realized, the pollution range is limited to be expanded, and pollutants are effectively leached and filtered in a controllable area.
The setting depth of the underground water monitoring well 21 is as follows: more than 1m of the underground water is located above the water level 400 in the water abundance period, more than 1m of the underground water is located below the water level 500 in the dry period, the underground water containing pollutants can be effectively pumped all the year round, the underground water monitoring well 21 is internally provided with a water filtering pipe, the outer diameter is not less than phi 146mm, the sufficient water pumping amount can be kept, and the good effective extraction effect is realized.
The water delivery pipe 12 of the leaching system 1 is provided with a regulating valve for regulating water quantity, the water quantity can be regulated according to the concentration of pollutants and the permeability coefficient of the aeration zone 200, the leaching water quantity is regulated from small to large, the optimal leaching treatment effect is achieved by adopting the underground water pumping treatment capacity of the underground water monitoring well 21 which is not more than the distributed underground water pumping treatment capacity.
The shower pipes 11 of the leaching system 1 may be arranged on the ground surface of the contaminated area 100 or may be buried shallowly. The evaporation of the water quantity can be reduced by preferably arranging the shallow buried way, and the leaching effect is increased and accelerated.
Edible surfactant can be added into leaching water, so that the dissolving effect on pollutants is enhanced, a more effective leaching effect is realized, and the purpose of simultaneously treating polluted soil and underground water is achieved.
In this specification, the invention has been described with reference to specific embodiments thereof, but it will be apparent that various modifications can be made without departing from the scope of the invention. The description is thus to be regarded as illustrative instead of limiting.
Claims (10)
1. A leaching extraction treatment method for loose stratum plot pollution is characterized in that in a pollution area of the loose stratum plot, the leaching water quantity is increased manually, the mobility of pollutants in an aeration zone is increased, the migration of the pollutants in the aeration zone to underground water is accelerated, and the pollutants in the aeration zone which are difficult to treat are leached into the underground water; and pumping the leached underground water containing the pollutants out of the polluted area and the downstream area in the underground water flow direction through an underground water monitoring well.
2. The leaching extraction treatment method for loose formation parcel contamination according to claim 1, wherein the treatment method comprises the following steps:
A. arranging a water conveying pipe in a pollution area of a unconsolidated formation plot to increase the leaching water quantity, increase the mobility of pollutants in an aeration zone, accelerate the migration of the pollutants in the aeration zone to underground water, and leach the pollutants in the aeration zone which are difficult to treat into the underground water;
B. and pumping the leached underground water containing the pollutants out through the underground water monitoring wells by utilizing the existing or additionally arranged underground water monitoring wells in the polluted area and the downstream area in the underground water flow direction.
3. The leaching and pumping treatment method for unconsolidated formation parcel contamination according to claim 1 or 2, wherein the pumping of the groundwater monitoring well forms a falling funnel water level area covering the contaminated area and the secondary contaminated area.
4. The leaching and pumping treatment method for unconsolidated formation parcel contamination according to claim 1 or 2, wherein the depth of the groundwater monitoring wells is set as follows: more than 1m is above the water level in the groundwater rich period, and more than 1m is below the water level in the dry period.
5. A method as claimed in claim 1 or claim 2, wherein the leach water is supplemented with a food grade surfactant.
6. A leaching and pumping treatment system for unconsolidated formation plot pollution is characterized by comprising a leaching system (1) distributed in a contaminated area of unconsolidated formation plot and an extraction system (2) distributed in the contaminated area and a downstream area of the contaminated area in the water flow direction of underground water;
the leaching system (1) comprises: a water delivery pump (13), a water delivery pipe (12) and a spray pipe (11) connected with the water delivery pump; the extraction system (2) comprises: the underground water monitoring system comprises an underground water monitoring well (21) and a water suction pump (22), wherein a water suction pipe of the water suction pump (22) extends into the underground water monitoring well (21).
7. A leaching and pumping treatment system for unconsolidated formation parcel contamination according to claim 6 wherein groundwater monitoring wells (21) are deployed to pump water to form a falling funnel level fall area covering the contaminated and secondary contaminated areas.
8. A leaching and extraction treatment system for unconsolidated formation parcel contamination according to claim 6, wherein the groundwater monitoring wells (21) are set at depths of: more than 1m is above the water level in the groundwater rich period, and more than 1m is below the water level in the dry period.
9. Leaching and pumping treatment system for unconsolidated formation parcel contamination according to claim 6, wherein the water delivery pipe (12) of the leaching system (1) is provided with a regulating valve for regulating the amount of water.
10. Leaching extraction treatment system of loose formation parcel contamination according to claim 6, characterized in that the shower (11) of the leaching system (1) is buried shallow in the contaminated area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271680.0A CN112893431A (en) | 2021-03-12 | 2021-03-12 | Leaching extraction treatment method and system for loose stratum land block pollution |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110271680.0A CN112893431A (en) | 2021-03-12 | 2021-03-12 | Leaching extraction treatment method and system for loose stratum land block pollution |
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2021
- 2021-03-12 CN CN202110271680.0A patent/CN112893431A/en active Pending
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