CN107935066B - Pollution resistance control-based LNAPL pollution remediation system and method in underground water - Google Patents
Pollution resistance control-based LNAPL pollution remediation system and method in underground water Download PDFInfo
- Publication number
- CN107935066B CN107935066B CN201711154885.0A CN201711154885A CN107935066B CN 107935066 B CN107935066 B CN 107935066B CN 201711154885 A CN201711154885 A CN 201711154885A CN 107935066 B CN107935066 B CN 107935066B
- Authority
- CN
- China
- Prior art keywords
- pollution
- lnapl
- underground water
- groundwater
- pumping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
A system and a method for restoring LNAPL pollution in underground water based on pollution resistance control are disclosed, wherein the restoration system comprises a vertical separation wall, a pumping-out processing unit and a recharging system. The remediation method of LNAPL pollution in groundwater based on pollution prevention and control carries out groundwater pumping treatment and recharge water backwashing on the basis of implementing vertical obstruction on polluted groundwater, solves the problem of trailing rebound phenomenon in the traditional pumping treatment method, more effectively finishes groundwater pollution remediation, effectively controls the diffusion range and treatment capacity of the groundwater LNAPL, greatly improves remediation efficiency, and saves engineering cost by laying infiltration tanks in the vertical infiltration prevention grooving process.
Description
Technical Field
The invention belongs to the technical field of groundwater pollution control, and particularly relates to a system and a method for remedying LNAPL pollution in groundwater based on pollution control.
Background
With the rapid development of the chemical industry in recent years, a large amount of light non-aqueous phase liquid (LNAPL) enters soil and groundwater every year during the production, transmission, storage and use of products, and becomes an important pollutant, which commonly comprises petroleum, kerosene and paraxylene. The LNAPL has small water solubility, is not easy to degrade and remove, has most of the hazards of carcinogenesis, teratogenesis and mutagenesis, and most of the hazardous and harmful organic pollutants which are prioritized and controlled by various countries have long-term adverse effects on human health and ecological environment once entering the environment.
LNAPL is less dense than water, and LNAPL that enters groundwater tends to be present on the surface of aquifers, and when it encounters a soil layer with a fine particle size, it adheres thereto to form light oil aggregates. LNAPL retained in soil and groundwater can further migrate due to volatilization, dissolution or external force, resulting in a wider range of soil and groundwater environment pollution. The residual LNAPL pollutants in the saturated aquifer are one of the difficulties faced by the groundwater remediation work, and because the LNAPL has lower water solubility and higher interfacial tension with water, the traditional pumping treatment method has poor effect and often has trailing rebound phenomenon.
Disclosure of Invention
In view of the deficiencies of the prior art, it is a primary object of the present invention to provide a system and method for pollution remediation by LNAPL in groundwater based on pollution control, so as to solve at least one of the above problems.
The invention is realized by the following technical scheme:
as one aspect of the invention, the invention provides a pollution control-based LNAPL pollution remediation system in underground water, which comprises a vertical separation wall, a pumping processing unit and a recharging system; wherein the content of the first and second substances,
the vertical separation walls enclose a limited range and penetrate into the ground to a certain depth, and at least the upper half part of the ground water polluted by the LNAPL is separated in the limited range;
the pumping treatment unit comprises a pumping pipeline and a treatment unit, wherein the pumping pipeline is positioned in a limited range surrounded by the vertical barrier walls and is used for pumping the underground water polluted by the LNAPL into the treatment unit for treatment and then injecting the underground water into a recharge system;
the recharging system is arranged between the pumping pipeline and the vertical separation wall and is used for recharging the underground water treated by the treatment unit into the underground water flow channel.
Preferably, the vertical separation wall is composed of an HDPE geomembrane, the upper end of the HDPE geomembrane is positioned above the ground surface, and the lower end of the HDPE geomembrane is positioned 0.5-1 m below the water level of the polluted target aquifer.
Preferably, the bottom of the pumping pipeline is located 0.3-0.5 m below the water level of the polluted aquifer.
Preferably, the pipe diameter of the pumping pipeline is 300-400 mm.
Preferably, the recharge system consists of a percolation tank.
Preferably, the seepage grooves are distributed in a circumference way, and the radius r of the circumference of the seepage groove of the nth layernRn/m; wherein R is the radius of the circumference of the seepage groove at the outermost layer, m is the total number of layers, and the innermost layer is the first layer; the distance between the innermost layer seepage groove and the pumping pipeline is 1-2 m.
Preferably, the upper part of the seepage groove is flush with the ground surface, and the lower part of the seepage groove is located 30-50 mm above the bottom of the vertical separation wall.
As another aspect of the present invention, a pollution control-based method for remedying LNAPL pollution in groundwater is provided, where the pollution control-based system for remedying LNAPL pollution in groundwater is utilized, and the method includes the specific steps of: and conveying the polluted underground water to a treatment unit through a pumping pipeline, adding a solubilizer into the purified water, then introducing the purified water into a target aquifer through a recharge system, pumping water again after a period of time, repeating the remediation process, and circularly dissolving out LNAPL in a mode of bringing the recharge water into the solubilizer to realize efficient remediation of the polluted underground water.
Preferably, the vertical barrier walls and the outermost seepage grooves are arranged simultaneously after the vertical grooving.
Preferably, the recharge system is arranged in layers according to the condition of the polluted site
According to the technical scheme, the repairing system and the repairing method have the following beneficial effects:
(1) the underground water pollution remediation engineering is implemented after vertical seepage prevention is utilized, the diffusion range and the treatment capacity of the underground water LNAPL are effectively controlled, the remediation efficiency is greatly improved, the vertical seepage-proofing wall does not need to be arranged on a water-resisting layer according to the characteristics of the LNAPL, and meanwhile, seepage grooves are arranged in the vertical seepage-proofing grooving process, so that the engineering cost is saved;
(2) the underground water LNAPL pollution remediation method based on pollution resistance control is constructed, and the problems that the traditional pumping treatment method is poor in effect and the trailing rebound phenomenon often occurs are solved by combining the hydraulic backwashing control of adding the solubilizer;
(3) according to the groundwater LNAPL pollution remediation method based on pollution control, the remediation zone is located on the ground surface, so that the medium material can be flexibly replaced to obtain a good remediation effect.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of an LNAPL pollution remediation system in groundwater based on pollution control in an embodiment of the invention;
FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention of a pollution control-based LNAPL pollution remediation system in groundwater;
wherein: 1-vertical separation wall, 2-pumping treatment unit, 3-seepage tank, 4-polluted aquifer water level and 5-water distribution pipe.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention provides a pollution resistance control-based LNAPL pollution remediation system and method in underground water. The remediation method of LNAPL pollution in groundwater based on pollution prevention and control carries out groundwater pumping treatment and recharge water backwashing on the basis of implementing vertical obstruction on polluted groundwater, solves the problem of trailing rebound phenomenon in the traditional pumping treatment method, more effectively finishes groundwater pollution remediation, effectively controls the diffusion range and treatment capacity of the groundwater LNAPL, greatly improves remediation efficiency, and saves engineering cost by laying infiltration tanks in the vertical infiltration prevention grooving process.
Specifically, the invention provides a pollution control-based LNAPL pollution remediation system in underground water, which comprises a vertical separation wall, a pumping-out processing unit and a recharging system; wherein the content of the first and second substances,
the vertical separation walls enclose a limited range and penetrate into the ground to a certain depth, and at least the upper half part of the ground water polluted by the LNAPL is separated in the limited range;
the pumping treatment unit comprises a pumping pipeline and a treatment unit, wherein the pumping pipeline is positioned in a limited range surrounded by the vertical barrier walls and is used for pumping the underground water polluted by the LNAPL into the treatment unit for treatment and then injecting the underground water into a recharge system;
the recharging system is arranged between the pumping pipeline and the vertical separation wall and is used for recharging the underground water treated by the treatment unit into the underground water flow channel.
Preferably, the vertical separation wall is composed of HDPE geomembrane with the thickness of 2-4 mm, the upper end of the geomembrane exceeds the ground surface by 30-50 mm, the lower end of the geomembrane is located 0.5-1 m below the water level of the polluted target aquifer, and the LNAPL polluted underground water is shielded in a limited range.
Preferably, the pumping treatment unit consists of a plurality of pumping pipelines with the pipe diameters of 300-400 mm and a surface treatment unit, the bottom of each pumping pipeline is located 0.3-0.5 m below the water level of the polluted aquifer, and the polluted underground water is pumped out for surface treatment and then is injected into the recharge system through a water guide pipe.
Preferably, the recharge system comprises a plurality of seepage grooves with the thickness of 30-50 mm, the seepage grooves are distributed in a circumferential manner, and the radius r of the circumference of the seepage groove on the nth layernRn/m; wherein R is the radius of the circumference of the seepage groove at the outermost layer, m is the total number of layers, and the innermost layer is the first layer; the distance between the innermost layer seepage groove and the pumping pipeline is 1-2 m. The seepage grooves on the outermost layer are arranged at the same time of slotting the vertical separation wall, and are positioned on the inner side of the vertical separation wall, namely on the side facing the polluted area. The upper part of the seepage groove is flush with the ground surface, and the lower part of the seepage groove is located 30-50 mm above the bottom of the vertical separation wall.
In practical engineering application, the vertical separation wall and the infiltration groove on the outermost layer are arranged after vertical grooving, and the recharge system is arranged in layers according to the pollution site condition. And after the vertical barrier wall and the recharge system are arranged, arranging a pumping pipeline and a surface treatment system according to the pollution range and degree of the field. The specific repairing process is that a water suction pump is started, polluted underground water is conveyed to a surface treatment system from a water suction system for treatment, purified water enters a target aquifer through a recharge system after being added with a solubilizer, the dissolution of LNAPL in the aquifer is enhanced, water is pumped again after a period of time, the repairing process is repeated, the LNAPL is dissolved out in a cyclic and reciprocating mode of introducing the recharge water into the solubilizer, the efficient repairing of the polluted underground water is achieved, and trailing and rebounding phenomena are avoided.
The following description is made for further explanation of the implementation and application of the present invention by referring to the accompanying drawings and several specific embodiments.
Examples
Fig. 1 is a schematic longitudinal section view of an underground water LNAPL pollution remediation system based on pollution resistance control, and fig. 2 is a schematic cross-sectional view of an underground water LNAPL pollution remediation system based on pollution resistance control. As shown in fig. 1 and 2, the system is composed of a vertical barrier wall 1, a pumping treatment unit 2 and a recharge system 3. The vertical separation wall 1 is composed of HDPE geomembranes with the thickness of 2-4 mm, the upper end of each geomembrane exceeds the ground surface by 30-50 mm, the lower end of each geomembrane is located 0.5-1 m below the water level 4 of a polluted target aquifer, the underground water polluted by LNAPL is shielded in a limited range, and further pollution diffusion is controlled. The pumping treatment unit 2 consists of a plurality of pumping pipelines with the pipe diameters of 300-400 mm and surface treatment facilities, the bottom of each pumping pipeline is located 0.3-0.5 m below the water level 4 of the polluted aquifer, and the polluted underground water is pumped out for surface treatment and then is injected into a recharge system through a water distribution pipe 5. The recharge system 3 is composed of a plurality of seepage grooves 3 with the thickness of 30-50 mm, the seepage grooves 3 are circumferentially arranged, as shown in fig. 2, the radius Rn of the seepage groove 3 on the nth layer is Rn/m (R is the radius of the seepage groove on the outermost layer, m is the total number of layers, the innermost layer is the first layer), and the distance between the seepage grooves 3 which are perpendicular to the flow direction of underground water and close to a pollution source is 1-2 m. The seepage grooves 3 at the outermost layer are arranged at the same time of slotting the vertical barrier wall, and the seepage grooves 3 are positioned at the inner side of the vertical barrier wall, namely, the side facing the polluted area. The upper part of the seepage groove 3 is flush with the ground surface, and the lower part is located 30-50 mm above the bottom of the vertical separation wall.
In practical engineering application, the vertical separation wall 1 and the infiltration groove 3 on the outermost layer are arranged after vertical grooving, and the recharge system is arranged in layers according to the pollution site condition. And after the vertical barrier wall and the recharge system are arranged, arranging a pumping pipeline and a surface treatment system according to the pollution range and degree of the field. The specific repairing process is that a water suction pump is started, polluted underground water is conveyed to a surface treatment system from a water suction system for treatment, purified water enters a target aquifer through a recharge system after being added with a solubilizer, the dissolution of LNAPL in the aquifer is enhanced, water is pumped again after a period of time, the repairing process is repeated, the LNAPL is dissolved out in a cyclic and reciprocating mode of introducing the recharge water into the solubilizer, the efficient repairing of the polluted underground water is achieved, and trailing and rebounding phenomena are avoided.
The remediation method of LNAPL pollution in groundwater based on pollution prevention and control carries out groundwater pumping treatment and recharge water backwashing on the basis of vertical blocking of polluted groundwater, solves the problems of poor effect and trailing rebound phenomenon of the traditional pumping treatment method, and more effectively finishes groundwater pollution remediation. According to the LNAPL characteristic, the vertical anti-seepage wall can play a role in controlling the diffusion of pollutants without being arranged on a water-resisting layer, and meanwhile, the seepage grooves are arranged in the vertical anti-seepage grooving process, so that the engineering cost is saved. Meanwhile, the system repair area is located on the ground surface, and medium materials can be flexibly replaced to obtain a good repair effect.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An LNAPL pollution remediation system in underground water based on pollution resistance control is characterized by comprising a vertical separation wall, a pumping-out processing unit and a recharging system; wherein the content of the first and second substances,
the vertical separation wall is composed of HDPE geomembranes, the upper end of the HDPE geomembrane is positioned above the ground surface, and the lower end of the HDPE geomembrane is positioned 0.5-1 m below the water level of the polluted target aquifer, so that the vertical separation wall encloses a limited range and separates at least the upper half part of the underground water polluted by LNAPL within the limited range;
the pumping treatment unit comprises a pumping pipeline and a treatment unit, wherein the pumping pipeline is positioned in a limited range surrounded by the vertical barrier walls and is used for pumping the underground water polluted by the LNAPL into the treatment unit for treatment and then injecting the underground water into a recharge system;
the recharge system is arranged between the pumping pipeline and the vertical separation wall and used for recharging the solubilizer and the underground water treated by the treatment unit into the underground water flow channel, the recharge system consists of a plurality of seepage grooves which are circumferentially arranged, and the radius r of the circumference of the seepage groove on the nth layernRn/m; wherein R is the radius of the circumference of the seepage groove at the outermost layer, m is the total number of layers, and the innermost layer is the first layer; the distance between the innermost layer seepage groove and the pumping pipeline is 1-2 m.
2. The pollution control-based underground water LNAPL pollution remediation system of claim 1, wherein the bottom of the extraction pipeline is 0.3-0.5 m below the water level of the polluted aquifer.
3. The pollution control-based underground water LNAPL pollution remediation system of claim 1, wherein the pipe diameter of the extraction line is 300-400 mm.
4. The pollution control-based LNAPL pollution remediation system in groundwater according to claim 1, wherein the upper part of the seepage tank is level with the ground surface, and the lower part is 30-50 mm above the bottom of the vertical barrier wall.
5. A method for remedying LNAPL pollution in groundwater based on pollution control by using the system for remedying the LNAPL pollution in groundwater based on pollution control as claimed in any one of claims 1 to 4 is characterized by comprising the following specific steps: and conveying the polluted underground water to a treatment unit through a pumping pipeline, adding a solubilizer into the purified water, then introducing the purified water into a target aquifer through a recharge system, pumping water again after a period of time, repeating the remediation process, and circularly dissolving out LNAPL in a mode of bringing the recharge water into the solubilizer to realize efficient remediation of the polluted underground water.
6. The pollution control-based remediation method of LNAPL pollution in groundwater according to claim 5, wherein the vertical barrier walls and the outermost seepage grooves are laid simultaneously after vertical trenching.
7. The pollution control-based remediation method of LNAPL pollution in groundwater according to claim 5, wherein the recharge system is deployed hierarchically according to the situation of the polluted site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711154885.0A CN107935066B (en) | 2017-11-17 | 2017-11-17 | Pollution resistance control-based LNAPL pollution remediation system and method in underground water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711154885.0A CN107935066B (en) | 2017-11-17 | 2017-11-17 | Pollution resistance control-based LNAPL pollution remediation system and method in underground water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107935066A CN107935066A (en) | 2018-04-20 |
| CN107935066B true CN107935066B (en) | 2020-11-10 |
Family
ID=61931960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711154885.0A Active CN107935066B (en) | 2017-11-17 | 2017-11-17 | Pollution resistance control-based LNAPL pollution remediation system and method in underground water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107935066B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007130602A (en) * | 2005-11-11 | 2007-05-31 | Kurita Water Ind Ltd | Construction method for enclosing contaminated soil and groundwater |
| CN102974600A (en) * | 2012-11-10 | 2013-03-20 | 华北电力大学 | Periodic-dosing oil-gas-liquid three-phase extraction device and method thereof for repairing petroleum-contaminated soil |
| CN103613236A (en) * | 2013-12-04 | 2014-03-05 | 中国环境科学研究院 | Meandering steam type groundwater pollution repairing device |
| CN206384854U (en) * | 2016-11-01 | 2017-08-08 | 北京高能时代环境技术股份有限公司 | One kind, which is drawn water, handles re-injection ground water circulation repair system |
-
2017
- 2017-11-17 CN CN201711154885.0A patent/CN107935066B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007130602A (en) * | 2005-11-11 | 2007-05-31 | Kurita Water Ind Ltd | Construction method for enclosing contaminated soil and groundwater |
| CN102974600A (en) * | 2012-11-10 | 2013-03-20 | 华北电力大学 | Periodic-dosing oil-gas-liquid three-phase extraction device and method thereof for repairing petroleum-contaminated soil |
| CN103613236A (en) * | 2013-12-04 | 2014-03-05 | 中国环境科学研究院 | Meandering steam type groundwater pollution repairing device |
| CN206384854U (en) * | 2016-11-01 | 2017-08-08 | 北京高能时代环境技术股份有限公司 | One kind, which is drawn water, handles re-injection ground water circulation repair system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107935066A (en) | 2018-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107720853B (en) | DNAPL (deoxyribonucleic acid-PL) pollution remediation system and method in underground water based on pollution resistance control | |
| CN206232569U (en) | Underground water pollution place pump-and-treat system and biological synthesis repair system | |
| CN111136094B (en) | Method for restoring polluted soil and underground water | |
| CN108330953B (en) | Novel composite underground seepage-proofing bentonite wall and construction method thereof | |
| CN105945045A (en) | In-situ vertical well leaching repair system and application method | |
| US5054961A (en) | Onsite soil treatment process | |
| CN106277406A (en) | Series progressive subsoil water heavy metal pollution in-situ remediation system and restorative procedure | |
| CN111097787B (en) | Method for restoring polluted soil and underground water | |
| CN203853374U (en) | In-situ polluted soil leaching system | |
| CN104624638B (en) | The dystopy microorganism remediation system and restorative procedure of petroleum-polluted soil | |
| CN107159698A (en) | A kind of method that three-dimensional well elution joint stabilizes in-situ remediation soil polluted by heavy metals | |
| CN111097785B (en) | Method for restoring polluted soil and underground water | |
| CN106186123A (en) | Hypotonicity contaminated site circulation controllable groundwater remediation system and restorative procedure | |
| CN113500091A (en) | Heavy metal contaminated soil and underground water repairing system and repairing method | |
| US10232416B1 (en) | Corrugated and slotted injection system and method of use | |
| CN107935066B (en) | Pollution resistance control-based LNAPL pollution remediation system and method in underground water | |
| CN213679892U (en) | Horizontal well repairing device for polluted underground water | |
| CN111136093B (en) | Method for restoring polluted soil and underground water | |
| CN104478027B (en) | For the technique that volatile organic contaminant in subsoil water is repaired | |
| CN209428159U (en) | Phreatic water extracts restoration processing system out | |
| CN111807492B (en) | NAPL pollution restoration system in underground water based on pollution control and restoration method thereof | |
| CN108203990B (en) | Construction method of composite underground seepage-proofing bentonite wall | |
| JP5030999B2 (en) | Contaminated soil purification method | |
| CN112922039A (en) | Negative pressure prevention of seepage clean system | |
| CN111733890A (en) | Polluted underground water blocking treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |