CN111807492A - NAPL pollution remediation system and method in underground water based on pollution prevention and control - Google Patents
NAPL pollution remediation system and method in underground water based on pollution prevention and control Download PDFInfo
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- CN111807492A CN111807492A CN202010506326.7A CN202010506326A CN111807492A CN 111807492 A CN111807492 A CN 111807492A CN 202010506326 A CN202010506326 A CN 202010506326A CN 111807492 A CN111807492 A CN 111807492A
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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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
- Y02A20/40—Protecting water resources
- Y02A20/406—Aquifer recharge
Abstract
The invention discloses a NAPL pollution remediation system in underground water based on pollution prevention and control, which comprises a vertical blocking wall, a water inlet pipe, a water outlet pipe and a water outlet pipe, wherein the vertical blocking wall is used for blocking the polluted underground water in the vertical blocking wall; the pumping unit is used for pumping underground water in the polluted area and providing pressure difference for the pollutants to flow through the vertical treatment system; a vertical treatment unit for treating contaminated groundwater to remove NAPL; and the recharging unit is used for pumping the water treated by the vertical treatment unit out and recharging the water to a target water-bearing layer of the polluted area. Aiming at the defects of poor effect, poor pertinence and frequent rebound of the traditional extraction treatment method, the invention provides a NAPL pollution remediation system suitable for various NAPL pollution types and underground water with different pollution depths. The method can be used for repairing the DNAPL pollution in the underground water and the LNAPL pollution, and realizes the flexible and effective repair and removal of NAPL pollutants at different pollution depths in the underground water.
Description
Technical Field
The invention relates to the field of groundwater remediation, and discloses a pollution prevention and control-based NAPL (non-aqueous phase change) pollution remediation system and a remediation method thereof in groundwater.
Background
In recent years, with the development of industry and agriculture, the pollution of underground water is gradually increased, and the method becomes a hot point for research at home and abroad. The most difficult and hazardous of groundwater is organic pollution, especially non-aqueous liquids (NAPLs). NAPL is classified into LNAPL (light) and DNAPL (heavy) according to the density of relative water, and these organic substances are less water-soluble, not easily degradable and removable, and most of them have carcinogenic, teratogenic and mutagenic hazards.
The LNAPL contaminant has the characteristics of small specific gravity and non-miscibility in water, and the transport of the LNAPL in the aquifer is controlled by its kinetic field and its permeability in the aquifer. DNAPL is mainly characterized in that the specific gravity is greater than that of water, so the gravity action is the main power for the DNAPL to enter soil and underground water; the low viscosity facilitates the movement of the polymer to the underground surface; the interfacial tension is low, so that the resin is easy to infiltrate into tiny pores or penetrate through the clay; the low solubility allows slow and sustained release to expand the area of contamination; the biodegradability is low, so that the pollution time of the soil and underground water is long. In actual groundwater pollution, various pollutants such as both LNAPL and DNAPL pollutants often exist, and due to mutual solubility and solubilization among organic pollutants, the migration rule of mixed NAPL pollutants in an aquifer is complicated. The traditional pumping and processing method has poor effect, can not flexibly set and effectively process LNAPL and DNAPL pollutants at different depths, and often has trailing rebound phenomenon.
Disclosure of Invention
The invention provides a NAPL pollution remediation system in groundwater based on pollution resistance control, aiming at the defects of poor effect, weak pertinence and frequent rebound phenomenon of the traditional pumping treatment method.
In order to solve the technical problem, the invention is solved by the following technical scheme: NAPL pollution remediation system in groundwater based on pollution control, characterized in that the system comprises
The vertical separation walls are distributed around the polluted area and used for separating polluted underground water into the vertical separation walls;
the water pumping unit is positioned on the inner side of the vertical separation wall and is used for pumping underground water in the polluted area and providing pressure difference for pollutants to flow through the vertical treatment system;
the vertical treatment unit is arranged in the polluted area and close to the side of the pumping unit, and comprises a vertical packing area and a vertical filtering area, wherein the vertical packing area is used for treating polluted underground water to remove NAPL, and the vertical filtering area is close to the vertical packing area and is positioned at the upstream of the underground water to filter particulate matters in the underground water so as to improve the removal efficiency of the packing area;
and the recharging unit comprises a plurality of recharging well pipes, and water treated by the vertical treatment unit is pumped out through the recharging well pipes and is recharged to a target aquifer of the polluted area.
Furthermore, the plurality of recharge well pipes are arranged on one side, facing the polluted area, of the vertical separation wall on one side of the polluted area in a manner of being tightly attached to the vertical separation wall, and the pumping unit is arranged on one side, facing the polluted area, of the vertical separation wall on the other side of the polluted area in a manner of being tightly attached to the vertical separation wall.
Preferably, the upper end of perpendicular separation wall surpasss ground surface 300mm ~500mm, is not less than the pumping well head, and the lower extreme is buried underground in the contaminated district aquifer water proof bottom plate, and HDPE geomembrane lower extreme and water proof bottom plate juncture leave 100mm surplus, are lax form, the non-tight form to prevent that the ground warp HDPE geomembrane tensile damage, perpendicular separation wall is 2~4 mm's HDPE geomembrane for thickness, and HDPE membrane inlays in concrete or inflation soil generally with the increase of strength.
Preferably, the depth range of the vertical packing area can be adjusted according to the NAPL pollution depth range of ground groundwater, the upper end of the depth range of the vertical packing area is 200mm higher than the upper end of the NAPL pollution depth, the lower end of the depth range of the vertical packing area is 200mm lower than the lower end of the NAPL pollution depth, the area from the upper end of the vertical packing area to the ground is blocked by a vertical blocking wall, and the area from the lower end of the vertical packing area to the water blocking bottom plate is blocked by a vertical blocking wall.
Preferably, the vertical packing region packing thickness is directly proportional to the logarithm of the regional groundwater contaminant concentration.
Preferably, the range of opening the sieve by the water pumping pipe of the water pumping unit can be set according to the NAPL pollution depth range of the ground groundwater, the upper end of the range of opening the sieve by the water pumping pipe is 300mm higher than the upper end of the NAPL pollution depth, the lower end of the range of opening the sieve by the water pumping pipe is 300mm lower than the lower end of the NAPL pollution depth, and the pipe diameter of the water pumping pipe is 200-300 mm.
Preferably, the recharge well pipes are not provided with sieve holes, the upper ends of the recharge well pipes are flush with the upper edge of the vertical barrier wall, the lower ends of the recharge well pipes are not higher than the NAPL pollution depth, the pipe diameters of the recharge well pipes are 20-40 mm, the arrangement intervals of the recharge well pipes are in inverse proportion to the arithmetic square root of the regional groundwater pollutant concentration, and the maximum well pipe interval is 5 m.
A NAPL pollution remediation method in groundwater based on pollution control, characterized in that the remediation method comprises the following steps:
(1) distributing the vertical separation wall, the vertical treatment unit, the water pumping unit and the recharge unit according to the pollution area, the pollution depth and the pollution degree;
(2) pumping the polluted underground water through the water pumping unit, and treating NAPL pollutants at a specific depth in the site through a vertical treatment unit at a set depth under the action of water force so as to remove NAPL;
(3) after adding a surfactant into the groundwater pumped out by the water pumping unit, the groundwater enters a target aquifer through the recharging unit at intervals, and the dissolution of NAPL in the soil aquifer is enhanced;
(4) the treatments of steps (2) to (3) are repeated to elute NAPL cyclically.
Wherein, the vertical separation wall is arranged around the polluted area; the water pumping unit comprises a plurality of water pumping pipes positioned on the inner side of the vertical separation wall on one side of the pollution area; the vertical treatment unit is arranged in the polluted area and close to the side of the pumping unit, and comprises a vertical packing area and a vertical filtering area, wherein the vertical packing area is used for treating polluted underground water to remove NAPL, and the vertical filtering area is close to the vertical packing area and is positioned at the upstream of the underground water to filter particulate matters in the underground water so as to improve the removal efficiency of the packing area; the recharging unit comprises a plurality of recharging well pipes which are positioned on the inner side of the vertical separation wall on the other side of the polluted area.
The invention realizes the effective remediation and removal of NAPL pollutants with different pollution depths in the groundwater.
Compared with the traditional extraction treatment method, the invention has the following advantages:
(1) according to the groundwater NAPL pollution remediation method based on pollution control, the extraction well, the vertical processing unit and the recharge well are arranged at the position close to the vertical separation wall, and the extraction well, the vertical processing unit and the recharge well are arranged in the vertical anti-seepage grooving process, so that the engineering cost is effectively saved.
(2) The method for repairing NAPL pollution of underground water based on pollution control is designed aiming at the type and depth range of NAPL pollution of the underground water, and comprises the steps of designing the depth range of a filling area of a vertical treatment unit, the sieving range of an underground water pumping well pipe and the recharge depth of a recharge well, treating NAPL pollution in the underground water more pertinently, effectively controlling the treatment capacity of the underground water and greatly improving the repair efficiency.
(3) According to the groundwater NAPL pollution remediation method based on pollution control, the vertical remediation unit packing area is in a modular design and can be freely taken out, the depth is convenient to adjust, meanwhile, the medium material can be flexibly replaced to obtain a good remediation effect, and the method can be used for DNAPL pollution remediation in groundwater and LNAPL pollution remediation.
(4) The groundwater NAPL pollution remediation method based on pollution prevention and control combines the hydraulic backwashing control of the added surfactant, solves the problems that the traditional pumping treatment method is poor in effect and trailing rebounding phenomenon often occurs, and reduces damage to the geology of a polluted area caused by remediation through the operations of circulating recharge and dissolving out NAPL in the remediation process.
(5) The pumping well can be used as a groundwater pollutant monitoring well at the same time, and is used for monitoring the repairing and removing condition of pollutants and judging whether the filler of the vertical treatment unit needs to be replaced.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional profile view of an underground water NAPL pollution remediation system based on pollution control according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a groundwater NAPL contamination remediation system based on contamination control according to an embodiment of the present invention.
In the drawings, the main reference symbols indicate:
1. an uncontaminated region; 2. a vertical barrier wall; 3. a water pumping unit; 4. a vertical packing region; 5. a vertical filtration zone; 6. a contaminated area; 7. a waterproof bottom plate; 8. and a recharging unit.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings 1 to 2 and examples:
in a specific embodiment, the vertical separation wall 2 is made of HDPE geomembrane with the thickness of 2mm, the upper end of the HDPE geomembrane exceeds 300mm of the ground surface and is flush with a well platform of the pumping unit 3, the lower end of the HDPE geomembrane is embedded in the aquifer water-proof bottom plate 5 of the polluted area, the bottom of the vertical separation wall is folded by 100mm to prevent the influence of foundation deformation, and the vertical separation wall mainly plays a role in separating polluted underground water, separating the uncontaminated area 1 from the polluted area 6 and preventing further pollution diffusion. The waterproof bottom plate 7 is a waterproof layer at the bottom of the water-containing layer. The vertical barrier wall 2 can also use other materials with waterproof barrier effect, but the HDPE geomembrane has more excellent performance.
The pumping unit 3 pumps the underground water, the range of the pumping pipe for opening the screen of the pumping unit can be set according to the NAPL pollution depth range of the ground underground water, the upper end of the range of the pumping pipe for opening the screen (opening) is 300mm higher than the upper end of the NAPL pollution depth, the lower end of the range of the pumping pipe for opening the screen is 300mm lower than the lower end of the NAPL pollution depth, the range of the underground water petroleum hydrocarbon pollution depth is approximately 2 m-4 m below the ground in a specific embodiment, and the range of the pumping pipe for opening the screen is 1.7 m-4.. The diameter of the water pumping pipe is 300 mm. The underground water forms a low water level on one side of a pumping well of the polluted site after being pumped out, and the polluted underground water in the site flows through a vertical filtering area 5 and a vertical filling area 4 of a vertical processing unit in sequence under the action of water force for processing.
The depth range of the vertical packing area can be adjusted according to the NAPL pollution depth range of ground groundwater, the upper end of the depth range of the vertical packing area is 200mm higher than the upper end of the NAPL pollution depth, and the lower end of the depth range of the vertical packing area is 200mm lower than the lower end of the NAPL pollution depth. In a specific embodiment, the approximate range of the petroleum hydrocarbon pollution depth of underground water is 2-4 m below the ground, the depth of the water-resisting layer is 12m below the ground, the depth range of the vertical packing area is set to be 1.8-4.2 m below the ground, the area, which is not from the upper end of the vertical packing area to the ground, is blocked by a vertical blocking wall, the area, which is not from the lower end of the vertical packing area to the water-resisting bottom plate, is blocked by a vertical blocking wall, the area, which is from the ground level to the upper end of the vertical packing area, is blocked by a HDPE geomembrane with the thickness of 2mm, and the blocking range is 0; and blocking the area, which is not between the lower end of the vertical filler area and the bottom baffle plate, by using an HDPE geomembrane with the thickness of 2mm, wherein the blocking range is 4.2-12 m below the ground.
The functional structure of the vertical packing zone is determined by the type of pollutant to be treated, in a specific embodiment, the underground water is mainly petroleum hydrocarbon pollutant, and the vertical packing zone adopts a mixture of reduced iron powder, waste pig iron and activated carbon as a reaction medium. The thickness of the filler in the vertical filler area is in direct proportion to the logarithm of the concentration of the regional underground water pollutants, in a specific embodiment, the concentration of the underground water petroleum hydrocarbons is 5000 mug/L, the thickness of the vertical filler area is set to be 200mm, and the removal rate of the petroleum hydrocarbons by the treatment unit can reach 85%. The groundwater treated by the filling area is pumped out by the pumping unit 3, mixed with the surfactant and conveyed to the recharging unit 8. The vertical filtering area 5 is generally made of clean quartz sand with the grain size of 0.8-1.2 mm.
The recharge unit 8 is composed of a plurality of recharge well pipes, the recharge well pipes are not provided with sieve holes, the upper ends of the recharge well pipes are flush with the upper edge of the vertical barrier wall, the lower ends of the recharge well pipes are located at the 500mm lower end of NAPL pollution depth (the lowest position is located at the 20-30 mm position above the aquifer water-stop bottom plate), the approximate range of the pollution depth of the underground water petroleum hydrocarbons in a specific embodiment is 2-4 m below the ground, and the lower ends of the recharge well pipes are 4.5m below the ground. The reinjection water is reinjected to the pollution depth, so that NAPL in the aquifer can be effectively dissolved out. The pipe diameter of the recharge well pipes is 50mm, and the arrangement interval of the recharge well pipes is 3 m.
As shown in fig. 2, the vertical separation wall 2 encloses the contaminated area of the site into a rectangular area, which is not strictly limited to the site shape in practice, or may be other irregular shapes, and can be flexibly laid according to the contaminated condition, and in addition, the arrangement of the pumping unit, the vertical processing unit and the recharging unit can also be flexibly laid according to the contaminated condition.
One of the NAPL pollution remediation systems in groundwater using pollution control based on pollution control as described above of the present invention comprises the steps of:
(1) distributing the vertical separation wall, the vertical treatment unit, the water pumping unit and the recharge unit according to the pollution area, the pollution depth and the pollution degree;
(2) pumping the polluted underground water through the water pumping unit, and treating NAPL pollutants at a specific depth in the site through a vertical treatment unit at a set depth under the action of water force so as to remove NAPL;
(3) after adding a surfactant into the groundwater pumped out by the water pumping unit, the groundwater enters a target aquifer through the recharging unit at intervals, and the dissolution of NAPL in the soil aquifer is enhanced; the surfactant is preferably green nontoxic biosurfactant, such as algal glycolipid, rhamnolipid, sophorolipid, etc.
(4) The treatments of steps (2) to (3) are repeated to elute NAPL cyclically.
The invention realizes the effective remediation and removal of NAPL pollutants with different pollution depths in the groundwater.
In conclusion, the groundwater NAPL pollution remediation method based on pollution control is characterized in that the extraction well, the vertical processing unit and the recharge well are arranged at the position close to the vertical separation wall, and the extraction well, the vertical processing unit and the recharge well are arranged in the vertical anti-seepage slotting process, so that the engineering cost is effectively saved; aiming at the depth range of NAPL pollution of underground water, the depth range of a filling area of a vertical processing unit, the sieving range of an underground water pumping well pipe and the recharge depth of a recharge well are designed, so that NAPL pollution with a specific depth in the underground water is treated more pertinently, the treatment capacity of the underground water is effectively controlled, and the remediation efficiency is greatly improved; the vertical repairing unit filler area can be freely taken out by adopting a modular design, the depth is convenient to adjust, and meanwhile, the medium material can be flexibly replaced to obtain a good repairing effect, so that the vertical repairing unit filler area can be used for repairing DNAPL pollution in underground water and LNAPL pollution; the hydraulic backwashing control with the surfactant is combined, the problems that the traditional pumping treatment method is poor in effect and trailing rebounding phenomenon often occurs are solved, and the operations of circulating recharging and dissolving out NAPL in the repairing process reduce damage of repairing to the geology of the polluted area.
Claims (9)
1. NAPL pollution remediation system in groundwater based on pollution control, characterized in that the system comprises
The vertical separation walls are distributed around the polluted area and used for separating polluted underground water into the vertical separation walls;
the water pumping unit comprises a plurality of water pumping pipes positioned on the inner side of the vertical separation wall and is used for pumping underground water in the polluted area and providing pressure difference for pollutants to flow through the vertical treatment system;
the vertical treatment unit is arranged in the polluted area and close to the side of the pumping unit, and comprises a vertical packing area and a vertical filtering area, wherein the vertical packing area is used for treating polluted underground water to remove NAPL, and the vertical filtering area is close to the vertical packing area and is positioned at the upstream of the underground water to filter particulate matters in the underground water so as to improve the removal efficiency of the packing area;
and the recharging unit comprises a plurality of recharging well pipes, and water treated by the vertical treatment unit is pumped out through the recharging well pipes and is recharged to a target aquifer of the polluted area.
2. The NAPL pollution remediation system in a groundwater based on pollution control of claim 1, wherein: the plurality of recharge well pipes are arranged on one side, facing the polluted area, of the vertical separation wall on one side of the polluted area in a mode of being tightly attached to the vertical separation wall, and the pumping unit is arranged on one side, facing the polluted area, of the vertical separation wall on the other side of the polluted area in a mode of being tightly attached to the vertical separation wall.
3. The NAPL pollution remediation system in a groundwater based on pollution control of claim 1, wherein: the upper end of perpendicular baffling wall surpasss ground surface 300mm ~500mm, is not less than the pumping well head, and the lower extreme is buried underground in contaminated district aquifer water proof bottom plate, folds 100mm in order to prevent the influence of ground deformation, perpendicular baffling wall is the HDPE geomembrane.
4. The NAPL pollution remediation system in a groundwater based on pollution control of claim 1, wherein: the upper end of the depth range of the vertical packing area is 200mm higher than the upper end of the NAPL pollution depth, the lower end of the depth range of the vertical packing area is 200mm lower than the lower end of the NAPL pollution depth, the area from the upper end of the vertical packing area to the ground is blocked by a vertical blocking wall, and the area from the lower end of the vertical packing area to the water blocking bottom plate is blocked by a vertical blocking wall.
5. The NAPL pollution remediation system in a groundwater based on pollution control of claim 1, wherein: the vertical packing region packing thickness is directly proportional to the logarithm of the regional groundwater contaminant concentration.
6. The NAPL pollution remediation system in a groundwater based on pollution control of claim 1, wherein: the upper end of the sieve opening range of the water pumping pipe is 300mm higher than the upper end of the NAPL pollution depth, the lower end of the sieve opening range of the water pumping pipe is 300mm lower than the lower end of the NAPL pollution depth, and the pipe diameter of the water pumping pipe is 200-300 mm.
7. The NAPL pollution remediation system in a groundwater based on pollution control of claim 3, wherein: the method is characterized in that no sieve mesh is arranged on the recharge well pipes, the upper ends of the recharge well pipes are flush with the upper edge of the vertical barrier wall, the lower ends of the recharge well pipes are located at the 500mm lower end of the NAPL pollution depth, the pipe diameters of the recharge well pipes are 20-40 mm, the arrangement intervals of the recharge well pipes are inversely proportional to the arithmetic square root of the concentration of regional groundwater pollutants, and the maximum well pipe interval is 5 m.
8. A restoration method of an NAPL pollution restoration system in underground water based on pollution prevention and control is characterized in that: the repairing method comprises the following steps:
(1) distributing the vertical separation wall, the vertical treatment unit, the water pumping unit and the recharge unit according to the pollution area, the pollution depth and the pollution degree;
(2) pumping the polluted underground water through the water pumping unit, and treating NAPL pollutants at a specific depth in the site through a vertical treatment unit at a set depth under the action of water force so as to remove NAPL;
(3) after adding a surfactant into the groundwater pumped out by the water pumping unit, the groundwater enters a target aquifer through the recharging unit at intervals, and the dissolution of NAPL in the soil aquifer is enhanced;
(4) the treatments of steps (2) to (3) are repeated to elute NAPL cyclically.
9. The method of claim 8 for remediation of a NAPL contamination remediation system in groundwater based on contamination control, wherein: the vertical separation walls are arranged around the polluted area; the water pumping unit comprises a plurality of water pumping pipes positioned on the inner side of the vertical separation wall on one side of the pollution area; the vertical treatment unit is arranged in the polluted area and close to the side of the pumping unit, and comprises a vertical packing area and a vertical filtering area, wherein the vertical packing area is used for treating polluted underground water to remove NAPL, and the vertical filtering area is close to the vertical packing area and is positioned at the upstream of the underground water to filter particulate matters in the underground water so as to improve the removal efficiency of the packing area; the recharging unit comprises a plurality of recharging well pipes which are positioned on the inner side of the vertical separation wall on the other side of the polluted area.
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Cited By (1)
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