CN114604983A - System and method for repairing in-situ circulating well of perfluoro and polyfluoroalkyl compounds in underground water - Google Patents
System and method for repairing in-situ circulating well of perfluoro and polyfluoroalkyl compounds in underground water Download PDFInfo
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- CN114604983A CN114604983A CN202210512717.9A CN202210512717A CN114604983A CN 114604983 A CN114604983 A CN 114604983A CN 202210512717 A CN202210512717 A CN 202210512717A CN 114604983 A CN114604983 A CN 114604983A
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- pipe
- aeration
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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
- C02F7/00—Aeration of stretches of 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/36—Organic compounds containing halogen
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an in-situ circulating well repairing system and method for perfluoro and polyfluoroalkyl compounds in underground water, which comprises the following steps: the well pipe is composed of a solid pipe, an upper sieve pipe and a lower sieve pipe, wherein the upper sieve pipe is positioned at the groundwater level, and the lower sieve pipe is positioned at the lower edge of the groundwater pollution range; the aeration system comprises an aeration pipe, the air outlet end of the aeration pipe is provided with an aeration head, and the aeration head is arranged in the lower section screen pipe area; the collecting and extracting system comprises an extracting pipe, wherein a foam collecting head is arranged at the collecting end of the extracting pipe and is arranged above the water surface of underground water in the well; the separation treatment system comprises a gas-liquid separator, a gas treatment device and a liquid phase collecting tank, wherein the inlet of the gas-liquid separator is connected with the discharge end of the extraction pipe, the exhaust port is connected with the gas treatment device, and the liquid discharge port is connected with the liquid phase collecting tank. The invention improves the recovery rate of PFAS by aeration stripping and combining with an underground water circulating well, and reduces the repair cost and repair period of PFAS polluted underground water.
Description
Technical Field
The invention relates to the technical field of underground water in situ, in particular to a system and a method for repairing a perfluoro and polyfluoroalkyl compound in underground water by using an in-situ circulating well.
Background
Perfluoro and polyfluoroalkyl compounds (PFAS) are a general term for a series of synthetic organofluoro compounds. The fire extinguishing agent is originally used for extinguishing large petroleum fires, and is often applied to manufacturing daily necessities and fire-fighting products with requirements on water resistance, pollution resistance, grease resistance and the like due to the extremely stable chemical structure, and oil repellency and hydrophobicity. The PFAS contains carbon-fluorine bonds with high bond energy, has difficult degradability and extremely high durability and mobility, is ubiquitous in water, sediments, soil, atmosphere and organisms, and has potential environmental and health risks.
Because PFAS has special properties such as high electronegativity, strong carbon-fluorine bond and the like, the common in-situ groundwater remediation technology (such as bioremediation, chemical oxidation and the like) has poor treatment effect on PFAS-polluted groundwater; although the in-situ thermal desorption technology is effective, the stable structure of the pollutants is damaged by extremely high heating temperature, and the repair cost and the energy consumption are extremely high; the pumping treatment technology is to pump a large amount of polluted underground water to the ground surface and then carry out water treatment to remove PFAS in the pumped water, but the system has long operation period, needs continuous energy supply and regular monitoring and maintenance, and has high cost and large secondary pollution risk. Therefore, there is a need for an in situ remediation technology for treating PFAS in soil and groundwater.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an in-situ circulating well repairing system and method for perfluoro and polyfluoroalkyl compounds in underground water.
The invention discloses an in-situ circulating well repairing system of perfluoro and polyfluoroalkyl compounds in underground water, which comprises:
the well casing comprises a solid pipe, an upper sieve pipe and a lower sieve pipe, wherein the upper sieve pipe is positioned at the groundwater level, and the lower sieve pipe is positioned at the lower edge of the groundwater pollution range;
the aeration system comprises an aeration pipe, the air outlet end of the aeration pipe is provided with an aeration head, and the aeration head is arranged in the lower section screen pipe area;
the system comprises a collecting and extracting system and a foam collecting device, wherein the collecting and extracting system comprises an extracting pipe, a foam collecting head is arranged at the collecting end of the extracting pipe, and the foam collecting head is arranged above the water surface of underground water in the well;
the separation treatment system comprises a gas-liquid separator, a gas treatment device and a liquid phase collecting tank, wherein the inlet of the gas-liquid separator is connected with the discharge end of the extraction pipe, the exhaust port is connected with the gas treatment device, and the liquid discharge port is connected with the liquid phase collecting tank.
As a further improvement of the invention, the exterior of the upper sieve tube and the lower sieve tube is filled with filter materials, and the materials of the well pipe include but are not limited to PVC, stainless steel and HDPE.
As a further improvement of the invention, an aeration valve is arranged on the aeration pipe, and the size of bubbles generated by the aeration head is 10-25 μm.
As a further improvement of the invention, the aeration system further comprises an aeration fan, and the aeration fan is connected with the air inlet end of the aeration pipe.
As a further improvement of the invention, an extraction valve is arranged on the extraction pipe, and the foam collecting head is in an inverted funnel shape.
As a further improvement of the present invention, the collection and extraction system further comprises an extraction blower, and the extraction blower is disposed on a pipeline between the gas-liquid separator and the gas treatment device.
As a further improvement of the invention, the gas treatment device is an activated carbon adsorption tank.
The invention also discloses an in-situ circulating well repairing method of the perfluoro and polyfluoroalkyl compounds in underground water, which comprises the following steps:
constructing an in-situ circulating well repairing system;
starting an aeration system, wherein PFAS pollutants in water are stripped to the water surface by micro-nano bubbles generated by the aeration system to form foam; meanwhile, the water level difference is formed outside the well, water in the aquifer is introduced into the well through the lower sieve tube, and then the water is injected into the aquifer from the upper sieve tube again, so that the underground water is circulated around the well pipe repeatedly;
Starting a collecting and extracting system, and extracting PFAS into a gas-liquid separator; the separated gas enters a gas treatment device, and the gas is discharged after reaching the standard; the concentrated liquid phase PFAS was separated and stored temporarily in a liquid phase collection tank.
Compared with the prior art, the invention has the beneficial effects that:
the invention utilizes the characteristic that PFAS is easy to be enriched on a gas/water interface, improves the recovery rate of PFAS by aeration stripping and combining with an underground water circulating well, reduces the repair cost and repair period of PFAS polluted underground water, and improves the efficiency of repairing the polluted underground water.
Drawings
FIG. 1 is a schematic diagram of an in situ circulation well remediation system for perfluorinated and polyfluoroalkyl compounds in groundwater according to one embodiment of the present invention.
In the figure:
11. solid tubes; 12. an upper sieve tube; 13. a lower sieve tube; 21. an aeration fan; 22. an aeration valve; 23. an aeration pipe; 24. an aeration head; 31. a foam collection head; 32. an extraction pipe; 33. an extraction valve; 34. an extraction fan; 41. a gas-liquid separator; 42. a gas processing device; 43. and a liquid phase collecting tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention is described in further detail below with reference to the following drawings:
as shown in fig. 1, the present invention provides an in situ circulating well remediation system for perfluoro and polyfluoroalkyl compounds in subterranean water, comprising: the device comprises a well pipe, an aeration system, a collection extraction system and a separation treatment system; wherein the content of the first and second substances,
the well pipe comprises a solid pipe 11, an upper sieve pipe 12 and a lower sieve pipe 13, wherein the upper sieve pipe 12 is positioned at the groundwater level, and the lower sieve pipe 13 is positioned at the lower edge of the groundwater pollution range; furthermore, the exterior of the upper screen 12 and the lower screen 13 is filled with filter materials such as quartz sand, the material of the well pipe includes but is not limited to PVC, stainless steel and HDPE, and the specific size and structure of the well pipe are determined according to site ground conditions and pollution conditions.
The aeration system comprises an aeration fan 21, an aeration valve 22, an aeration pipe 23 and an aeration head 24, wherein the aeration fan 21 can be arranged on the ground, and the aeration pipe 23 is positioned in a well and is preferably parallel to a well pipe; an aeration valve 22 is arranged on the aeration pipe 23, the air inlet end of the aeration pipe 23 is connected with an aeration fan 21, the air outlet end of the aeration pipe 23 is provided with an aeration head 24, and the aeration head 24 is arranged in the area of the lower sieve pipe 13; furthermore, the aeration system can adopt one or more aeration heads 24 to enhance the aeration effect; furthermore, the aeration system can adopt a micro-nano bubble generator, and the size of bubbles is preferably 10-25 μm.
The collecting and extracting system comprises a foam collecting head 31, an extracting pipe 32, an extracting valve 33 and an extracting fan 34, wherein the foam collecting head 31 is arranged at the collecting end of the extracting pipe 32, and the foam collecting head 31 is arranged above the water surface of underground water in the well, can be in a funnel shape and is used for collecting foam containing high-concentration PFAS generated by aeration; the discharge end of the extraction pipe 32 is connected to an extraction valve 33, an extraction blower 34 and a separation treatment system on the ground, so that the high-concentration PFAS foam is extracted into the separation treatment system.
The separation treatment system of the present invention comprises a gas-liquid separator 41, a gas treatment device 42, and a liquid phase collection tank 43, wherein an inlet of the gas-liquid separator 41 is connected to a discharge end of the extraction pipe 32, an exhaust port of the gas-liquid separator 41 is connected to the gas treatment device 42, and a drain port of the gas-liquid separator 41 is connected to the liquid phase collection tank 43. Further, the extraction fan 34 is provided on the piping between the gas-liquid separator 41 and the gas treatment device 42; further, the gas treatment device 42 may be an activated carbon adsorption tank, and the gas is discharged after reaching the standard; the liquid phase collection tank 43 temporarily stores the concentrated liquid phase PFAS separated by the gas-liquid separator, and then, considering the factors of processing capacity, cost, etc. comprehensively, it is recommended to transport the waste liquid in the liquid phase collection tank to a unit with processing capacity and qualification for harmless disposal.
The invention provides an in-situ circulating well repairing method of perfluoro and polyfluoroalkyl compounds in underground water, which comprises the following steps:
step 1, building one or more well pipes based on detection parameters such as distribution of pollution sources, and constructing an aeration system, a collection and extraction system and a separation treatment system to realize an in-situ circulating well repairing system;
step 3, starting the collecting and extracting system, and extracting the PFAS foam layer into a gas-liquid separator 41 of the separation treatment system;
step 4, starting the separation treatment system, and carrying out gas-liquid separation on the PFAS foam layer by using the gas-liquid separator 41; the separated gas enters a gas treatment device 42, and the gas is discharged after reaching the standard; the concentrated liquid phase PFAS is separated and temporarily stored in the liquid phase collection tank 43, and the waste liquid in the liquid phase collection tank is transported to a unit with treatment capacity and qualification for harmless disposal, such as incineration and the like.
And 5, arranging monitoring wells near and around the circulating well, continuously paying attention to the concentration change of the target pollutants, and timely correcting the deviation until the problems are found until the standard is reached.
The repair principle of the invention is as follows:
the PFAS has a hydrophilic head and a hydrophobic carbon-fluorine tail main chain, and the characteristics ensure that the PFAS has surface activity and is easy to concentrate at an air/water interface so as to be collected and separated and removed; based on the method, PFAS is enriched at a gas/water interface in a foam form by aeration stripping and combination of a groundwater circulating well; and then extracting the mixture to a separation treatment system for liquid-gas separation and treatment.
The invention has the advantages that:
the invention utilizes the characteristic that PFAS is easy to be enriched on a gas/water interface, improves the recovery rate of PFAS by aeration stripping and combining with an underground water circulating well, reduces the repair cost and repair period of PFAS polluted underground water, and improves the efficiency of repairing the polluted underground water.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An in situ circulating well remediation system for perfluoro and polyfluoroalkyl compounds in subterranean water comprising:
the well pipe is composed of a solid pipe, an upper screen pipe and a lower screen pipe, the upper screen pipe is positioned at the groundwater level, and the lower screen pipe is positioned at the lower edge of the groundwater pollution range;
the aeration system comprises an aeration pipe, the air outlet end of the aeration pipe is provided with an aeration head, and the aeration head is arranged in the lower section screen pipe area;
the collecting and extracting system comprises an extracting pipe, wherein a foam collecting head is arranged at the collecting end of the extracting pipe and is arranged above the water surface of underground water in the well;
the separation processing system comprises a gas-liquid separator, a gas processing device and a liquid phase collecting tank, wherein the inlet of the gas-liquid separator is connected with the discharge end of the extraction pipe, the exhaust port is connected with the gas processing device, and the liquid discharge port is connected with the liquid phase collecting tank.
2. The in situ circulation well remediation system of claim 1 wherein the exterior of the upper and lower screen sections are filled with filter material, the well casing material including but not limited to PVC, stainless steel and HDPE.
3. The in-situ circulating well repairing system according to claim 1, wherein an aeration valve is installed on the aeration pipe, and the size of bubbles generated by the aeration head is 10-25 μm.
4. The in-situ circulation well remediation system of claim 1 or claim 3 wherein the aeration system further comprises an aeration fan connected to the air inlet end of the aeration pipe.
5. The in situ circulation well remediation system of claim 1 wherein the extraction pipe is fitted with an extraction valve and the foam collection head is in the form of an inverted funnel.
6. The in-situ circulating well remediation system of claim 1 or 5 wherein the collection extraction system further comprises an extraction fan disposed on the piping between the gas-liquid separator and the gas treatment unit.
7. The in situ circulation well remediation system of claim 1 wherein the gas treatment device is an activated carbon adsorption tank.
8. A method of remediation based on an in situ circulation well remediation system as claimed in any one of claims 1 to 7, comprising:
constructing an in-situ circulating well repairing system;
starting an aeration system, wherein PFAS pollutants in water are stripped to the water surface by micro-nano bubbles generated by the aeration system to form foam; meanwhile, the water level difference is formed outside the well, water in the aquifer is introduced into the well through the lower sieve tube, and then the water is injected into the aquifer from the upper sieve tube again, so that the underground water is circulated around the well pipe repeatedly;
Starting a collecting and extracting system, and extracting PFAS into a gas-liquid separator; the separated gas enters a gas treatment device, and the gas is discharged after reaching the standard; the concentrated liquid phase PFAS was separated and stored temporarily in a liquid phase collection tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210512717.9A CN114604983A (en) | 2022-05-12 | 2022-05-12 | System and method for repairing in-situ circulating well of perfluoro and polyfluoroalkyl compounds in underground water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210512717.9A CN114604983A (en) | 2022-05-12 | 2022-05-12 | System and method for repairing in-situ circulating well of perfluoro and polyfluoroalkyl compounds in underground water |
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| CN114604983A true CN114604983A (en) | 2022-06-10 |
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| CN202210512717.9A Pending CN114604983A (en) | 2022-05-12 | 2022-05-12 | System and method for repairing in-situ circulating well of perfluoro and polyfluoroalkyl compounds in underground water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU219531U1 (en) * | 2023-05-23 | 2023-07-21 | Общество с ограниченной ответственностью "Каббаллкгеология" | WELL AERATION DEVICE |
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| CN103145232A (en) * | 2012-02-21 | 2013-06-12 | 清华大学 | Method and system using micro-nanometer bubbles to repair underground water in in-situ mode |
| JP2014141802A (en) * | 2013-01-23 | 2014-08-07 | Nakajima Kogyo:Kk | Wellhole repair method using superfine air bubbles, and device therefor |
| US20150041392A1 (en) * | 2012-02-21 | 2015-02-12 | Tsinghua University | Method and system using micro/nano bubbles for enhanced in situ remediation of polluted groundwater |
| CN109562334A (en) * | 2016-06-10 | 2019-04-02 | 欧佩克修复技术有限公司 | Method and apparatus for the separate substance from underground water |
| CN110482737A (en) * | 2019-08-02 | 2019-11-22 | 中科鼎实环境工程有限公司 | For the circulation well repair system of Organic Contamination of Groundwater object |
| CN114380380A (en) * | 2022-01-21 | 2022-04-22 | 森特士兴环保科技有限公司 | In-situ remediation system and method for perfluorinated compound polluted underground water |
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2022
- 2022-05-12 CN CN202210512717.9A patent/CN114604983A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103145232A (en) * | 2012-02-21 | 2013-06-12 | 清华大学 | Method and system using micro-nanometer bubbles to repair underground water in in-situ mode |
| US20150041392A1 (en) * | 2012-02-21 | 2015-02-12 | Tsinghua University | Method and system using micro/nano bubbles for enhanced in situ remediation of polluted groundwater |
| JP2014141802A (en) * | 2013-01-23 | 2014-08-07 | Nakajima Kogyo:Kk | Wellhole repair method using superfine air bubbles, and device therefor |
| CN109562334A (en) * | 2016-06-10 | 2019-04-02 | 欧佩克修复技术有限公司 | Method and apparatus for the separate substance from underground water |
| CN110482737A (en) * | 2019-08-02 | 2019-11-22 | 中科鼎实环境工程有限公司 | For the circulation well repair system of Organic Contamination of Groundwater object |
| CN114380380A (en) * | 2022-01-21 | 2022-04-22 | 森特士兴环保科技有限公司 | In-situ remediation system and method for perfluorinated compound polluted underground water |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU219531U1 (en) * | 2023-05-23 | 2023-07-21 | Общество с ограниченной ответственностью "Каббаллкгеология" | WELL AERATION DEVICE |
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Application publication date: 20220610 |