CN210656457U - Circulating well repair system for underground water organic pollutants - Google Patents
Circulating well repair system for underground water organic pollutants Download PDFInfo
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- CN210656457U CN210656457U CN201921247409.8U CN201921247409U CN210656457U CN 210656457 U CN210656457 U CN 210656457U CN 201921247409 U CN201921247409 U CN 201921247409U CN 210656457 U CN210656457 U CN 210656457U
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Abstract
The utility model provides a circulation well repair system to groundwater organic pollutant, include: the circulating well unit comprises a circulating well pipe, a water pumping pipe and an injection pipe, wherein the circulating well pipe is provided with an upper screen pipe section and a lower screen pipe section, so that the inside and the outside of the circulating well pipe are in filterability communication, and a sealer is used between the upper screen pipe section and the lower screen pipe section for water isolation; one of the pumping pipe and the injection pipe extends to a position, above the sealer, in the circulating well pipe; the other one passes through the sealer downwards and extends to a position below the sealer in the circulation well pipe; a submersible pump is arranged in the water pumping pipe; the stripping unit comprises a stripping tower, the stripping tower is connected with the water pumping pipe and can be used for stripping the underground water pumped from the water pumping pipe; and the gas distribution injection unit comprises a gas distribution water collecting tank and an injection pump, and is injected into the circulating well pipe through the injection pipe after the oxidant and/or the biological strengthening agent are/is added. The utility model discloses a two kinds of ways of taking out notes realize taking out NAPL looks pollutant's orientation.
Description
Technical Field
The utility model relates to a biological/chemical oxidation strengthening circulation well repair system to groundwater VOCs and SVOCs pollutant.
Background
With the development of the urbanization process, many chemical and pesticide enterprises begin to be moved, and after being moved, the soil and the underground water in the original factory area are polluted to different degrees and can be used for commercial land, houses or other construction after being repaired. Pollutants in soil and underground water, especially organic pollutants, have the characteristics of low content, multiple types, difficult treatment, great harm and the like, and seriously harm the health and normal life of people.
The existing circulating well repairing technology does not perform targeted treatment measures on NAPL phase pollutants which are difficult to treat in underground water repairing, most of the existing circulating well repairing technologies are underground aeration, and large aeration pressure needs to be provided for a land block with deep underground water burial depth if a high circulating effect is achieved, so that the technical requirement is high.
SUMMERY OF THE UTILITY MODEL
The utility model provides a circulation well repair system to groundwater organic pollutant, the above-mentioned technical problem that exists among the purpose solution prior art.
In order to achieve the above object, the utility model adopts the following technical scheme:
a circulating well remediation system for groundwater organic contaminants, comprising:
the circulating well unit comprises a circulating well pipe, a water pumping pipe and an injection pipe, wherein the circulating well pipe is provided with an upper screen pipe section and a lower screen pipe section, so that the inside and the outside of the circulating well pipe are in filterability communication, and a sealer is used between the upper screen pipe section and the lower screen pipe section for water isolation; one of the pumping pipe and the injection pipe extends to a position, above the sealer, in the circulating well pipe; the other one of the pumping pipe and the injection pipe downwards passes through the sealer and extends to a position below the sealer in the circulating well pipe; a submersible pump is arranged in the water pumping pipe;
the stripping unit comprises a stripping tower, the stripping tower is connected with the water pumping pipe and can be used for stripping the underground water pumped from the water pumping pipe;
the gas distribution injection unit comprises a gas distribution water collecting tank and an injection pump, wherein the gas distribution water collecting tank can be used for allowing the underground water treated by the stripping tower to enter and can be used for adding an oxidant and/or a biological strengthening agent; the treated water liquid in the gas distribution water collecting tank can be injected into the circulating well pipe through the injection pipe under the action of the injection pump.
The circulating well repairing system for underground water organic pollutants comprises: the system also comprises a gas phase extraction unit which comprises a gas extraction pipe, an extraction fan and a gas-liquid separator, wherein the lower end of the gas extraction pipe extends into the position, higher than the underground water level in the rich water period, in the circulating well pipe, the extraction fan is communicated with the upper end of the gas extraction pipe, and the gas-liquid separator can separate liquid in extracted gas.
The circulating well repairing system for underground water organic pollutants comprises: the water pumping pipe extends to the position, above the sealer, in the circulating well pipe, the lower end opening of the water pumping pipe is located above the sealer, a middle opening is further formed in the underground water level corresponding to the dry period, and a one-way valve is arranged at the middle opening.
The circulating well repairing system for underground water organic pollutants comprises: the submersible pump is arranged in the position, lower than the middle opening, in the water pumping pipe.
The circulating well repairing system for underground water organic pollutants comprises: the pipe walls of the upper screen pipe section and the lower screen pipe section are filled with quartz sand, so that the inside of the pipe and the outside of the pipe are in filterability communication.
The circulating well repairing system for underground water organic pollutants comprises: the highest position of the upper screen pipe section is 1-2m above the underground water level in the rich water period, and the lowest position of the upper screen pipe section is 2-3m below the underground water level in the low water period.
The circulating well repairing system for underground water organic pollutants comprises: and an outer pipe is also arranged outside the circulating well pipe, and is also provided with an upper screen pipe section, a sealer and a lower screen pipe section, and the positions of the outer pipe and the positions of the upper screen pipe section, the sealer and the lower screen pipe section of the circulating well pipe are the same.
The circulating well repairing system for underground water organic pollutants comprises: the tail gas treatment unit comprises an active carbon adsorption tank, and the tail gas generated by the gas phase extraction unit and the tail gas generated by the stripping tower are communicated to the active carbon adsorption tank.
The circulating well repairing system for underground water organic pollutants comprises: and an automatic feeder is arranged in the gas distribution water collecting tank and is used for feeding an oxidant and/or a biological strengthening agent.
The utility model has the advantages that:
(1) the circulating well repairing system aiming at the underground water organic pollutants can be used for treating saturated zones/unsaturated zones with the underground water burial depth of 20-40m or even deeper.
(2) The directional extraction of NAPL phase pollutants is realized through two extraction and injection modes.
(3) The main equipment is mostly on the ground, and the submersible pump is arranged outside the main pipe, so that the maintenance and the overhaul are convenient.
Drawings
Fig. 1 is a schematic structural diagram of a circulating well remediation system for groundwater organic pollutants.
Fig. 2 is another schematic diagram of the circulation structure of the system for repairing the circulation well for groundwater organic pollutants provided by the invention.
Description of reference numerals: an outer tube 1; an upper screen section 11; a lower screen section 12; a sealer 15; a circulation well pipe 2; an upper screen section 21; a lower screen section 22; a solid pipe section 23; bentonite or cement grout 24; a sealer 25; a water pumping pipe 3; a middle opening 31; a submersible pump 32; a check valve 33; a lower end opening 34; an injection pipe 4; a gas extraction pipe 51; an extraction fan 52; a gas-liquid separator 53; a stripping column 61; a gas distribution water collecting tank 71; an injection pump 72; an activated carbon adsorption tank 81.
Detailed Description
The utility model provides a circulating well repair system to groundwater organic pollutant, as shown in figure 1, including underground circulating well unit, blow off unit, gas distribution injection unit, vapor extraction unit and tail gas processing unit, wherein:
(1) circulation well unit
The circulating well unit comprises an outer pipe 1, a circulating well pipe 2, a water pumping pipe 3 and an injection pipe 4, wherein the circulating well pipe 2, the water pumping pipe 3 and the injection pipe 4 are all arranged in the outer pipe 1, and the water pumping pipe 3 and the injection pipe 4 are all of steel structures;
the circulating well pipe 2 is a main well pipe and is provided with an upper screen pipe section 21 and a lower screen pipe section 22, the other pipe sections are solid pipe sections 23, the pipe walls of the upper screen pipe section 21 and the lower screen pipe section 22 are filled with quartz sand, so that filterability communication is formed between the inside and the outside of the pipe, and the pipe wall of the solid pipe section 23 is filled with bentonite or cement grout 24 and has a water isolating function; the water separation is carried out between the upper screen pipe section 21 and the lower screen pipe section 22 by a sealer 25; the highest position of the upper screen pipe section 21 is 1-2m above the underground water level in the rich water period, and the lowest position is 2-3m below the underground water level in the dry water period;
the outer pipe 1 mainly plays a protection role, and the outer pipe 1 is also provided with an upper screen section 11, a sealer 15 and a lower screen section 12, and the positions of the upper screen section 21, the sealer 25 and the lower screen section 22 of the circulating well pipe 2 are the same;
the lower end opening 34 of the water pumping pipe 3 is positioned above the sealer 25, the water pumping pipe 3 is also provided with a middle opening 31 at the underground water level corresponding to the dry season, the submersible pump 32 is placed in the water pumping pipe 3 at a position slightly lower than the middle opening 31, so that LNAPL floating on the underground water level can be pumped out, the middle opening 31 is provided with the one-way valve 33, and water in the water pumping pipe 3 can be prevented from being back-filled into the circulating well pipe 2;
the injection pipe 4 penetrates through the sealer 25 downwards and is arranged in the lower screen section 22 of the circulating well pipe 2, the injection pipe is mainly used for treating recharging after dosing, and hydraulic circulation of the circulating well repairing system can be achieved through pumping out upper-layer underground water through the pumping pipe 3 and injecting lower-layer underground water through the injection pipe 4.
(2) Vapor Extraction (SVE) unit
The gas phase extraction unit comprises a gas extraction pipe 51, an extraction fan 52 and a gas-liquid separator 53, wherein the lower end of the gas extraction pipe 51 extends into the position, higher than the underground water level in the rich water period, in the circulation well pipe 2, the extraction fan 52 is communicated with the upper end of the gas extraction pipe 51, and the gas extraction pipe mainly provides negative pressure for the well environment; the gas-liquid separator 53 can separate liquid from the extracted gas;
the addition of the vapor extraction unit can form negative pressure in the upper space of the circulating well, VOCs on the upper part of the well pipe released due to the flowing of underground water and VOCs in the aeration zone of soil are extracted by the extraction fan 52, so that secondary pollution is prevented, and the VOCs in the aeration zone is effectively collected.
(3) Stripping unit
The stripping unit mainly comprises a stripping tower 61, can carry out stripping treatment on the underground water pumped out from the water pumping pipe 3, and effectively removes VOCs pollutants in the underground water.
(4) And a gas distribution injection unit.
The gas distribution injection unit mainly comprises a gas distribution water collecting tank 71 and an injection pump 72;
the underground water treated by the stripping tower 61 enters the air distribution water collecting tank 71, the oxidant or the biological strengthening agent can be added into the air distribution water collecting tank 71, the agent can be added manually or by an automatic feeder, meanwhile, air distribution pipes are distributed in the air distribution water collecting tank 71, the oxygen content in the water of the air distribution water collecting tank 71 can be effectively improved, and the added oxidant/biological strengthening agent can be fully mixed with the water during air distribution.
The treated water liquid in the gas distribution water collecting tank 71 is injected into the circulating well pipe 2 through the injection pipe 4 under the action of the injection pump 72.
(5) Tail gas treatment unit
The tail gas treatment unit comprises an activated carbon adsorption tank 81, and tail gas generated by the gas phase extraction unit and tail gas generated by the stripping tower 61 enter the activated carbon adsorption tank 81 together and are discharged after reaching the standard after being treated.
Use the utility model discloses, can carry out following processing to the groundwater that has LNAPL to pollute:
(1) the water pumping pipe 3 is arranged at the upper part of the sealer 25 of the circulating well pipe 2, the submersible pump 32 is arranged in the water pumping pipe 3 and is slightly lower than the underground water level, polluted underground water is pumped out through the lower end opening 34 of the water pumping pipe 3, and LNAPL floating on the water surface is pumped out through the middle opening 31 of the water pumping pipe 3;
(2) the underground water pumped from the water pumping pipe 3 enters a stripping tower 61 for stripping treatment;
(3) the blown-off underground water enters a gas distribution water collecting tank 71 for gas distribution and addition of an oxidant/biological strengthening agent;
(4) the groundwater added with the gas distribution and the oxidant/biological strengthening agent is injected into the lower part of the sealer 25 of the circulation well pipe 2 through the injection pipe 4 by the injection pump 72;
(5) when the water pumping pipe 3 works, the gas phase extraction unit is started to carry out gas phase extraction on the aeration zone, and VOCs pollutants in the soil of the aeration zone are treated;
(6) the tail gas generated in the vapor extraction unit and the stripping tower 61 enters a tail gas treatment unit (activated carbon adsorption tank 81) to be purified and then discharged.
For the groundwater polluted by DNAPL, as shown in fig. 2, the submersible pump 32 can be put into the original injection pipe 4, and the connection direction of the injection pipe 4 on the ground and the water pumping pipe 3 is exchanged (i.e. the injection pipe 4 is connected to the stripping tower 61, and the water pumping pipe 3 is connected downstream of the gas distribution water collecting tank 71, which can be completed by the control of a valve), so that the functions of the injection pipe 4 and the water pumping pipe 3 are exchanged. At this time, the water pumping pipe 3 can pump the DNAPL positioned at the lower part of the sealer 25 for treatment, and the water subjected to air stripping and chemical adding treatment is injected into the upper part of the sealer 25 through the original water pumping pipe 3, so that hydraulic circulation which is pumped out from the underground part of the circulation and injected from the upper part of the circulation is formed.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A circulating well remediation system for groundwater organic contaminants, comprising:
the circulating well unit comprises a circulating well pipe, a water pumping pipe and an injection pipe, wherein the circulating well pipe is provided with an upper screen pipe section and a lower screen pipe section, so that the inside and the outside of the circulating well pipe are in filterability communication, and a sealer is used between the upper screen pipe section and the lower screen pipe section for water isolation; one of the pumping pipe and the injection pipe extends to a position, above the sealer, in the circulating well pipe; the other one of the pumping pipe and the injection pipe downwards passes through the sealer and extends to a position below the sealer in the circulating well pipe; a submersible pump is arranged in the water pumping pipe;
the stripping unit comprises a stripping tower, the stripping tower is connected with the water pumping pipe and can be used for stripping the underground water pumped from the water pumping pipe;
the gas distribution injection unit comprises a gas distribution water collecting tank and an injection pump, wherein the gas distribution water collecting tank can be used for allowing the underground water treated by the stripping tower to enter and can be used for adding an oxidant and/or a biological strengthening agent; the treated water liquid in the gas distribution water collecting tank can be injected into the circulating well pipe through the injection pipe under the action of the injection pump.
2. A circulating well remediation system for groundwater organic contaminants according to claim 1, wherein: the system also comprises a gas phase extraction unit which comprises a gas extraction pipe, an extraction fan and a gas-liquid separator, wherein the lower end of the gas extraction pipe extends into the position, higher than the underground water level in the rich water period, in the circulating well pipe, the extraction fan is communicated with the upper end of the gas extraction pipe, and the gas-liquid separator can separate liquid in extracted gas.
3. A circulating well remediation system for groundwater organic contaminants according to claim 1, wherein: the water pumping pipe extends to the position, above the sealer, in the circulating well pipe, the lower end opening of the water pumping pipe is located above the sealer, a middle opening is further formed in the underground water level corresponding to the dry period, and a one-way valve is arranged at the middle opening.
4. A circulating well remediation system for groundwater organic contaminants according to claim 3, wherein: the submersible pump is arranged in the position, lower than the middle opening, in the water pumping pipe.
5. A circulating well remediation system for groundwater organic contaminants according to claim 1, wherein: the pipe walls of the upper screen pipe section and the lower screen pipe section are filled with quartz sand, so that the inside of the pipe and the outside of the pipe are in filterability communication.
6. A circulating well remediation system for groundwater organic contaminants according to claim 1, wherein: the highest position of the upper screen pipe section is 1-2m above the underground water level in the rich water period, and the lowest position of the upper screen pipe section is 2-3m below the underground water level in the low water period.
7. A circulating well remediation system for groundwater organic contaminants according to claim 1, wherein: and an outer pipe is also arranged outside the circulating well pipe, and is also provided with an upper screen pipe section, a sealer and a lower screen pipe section, and the positions of the outer pipe and the positions of the upper screen pipe section, the sealer and the lower screen pipe section of the circulating well pipe are the same.
8. A circulating well remediation system for groundwater organic contaminants according to claim 2, wherein: the tail gas treatment unit comprises an active carbon adsorption tank, and the tail gas generated by the gas phase extraction unit and the tail gas generated by the stripping tower are communicated to the active carbon adsorption tank.
9. A circulating well remediation system for groundwater organic contaminants according to claim 1, wherein: and an automatic feeder is arranged in the gas distribution water collecting tank and is used for feeding an oxidant and/or a biological strengthening agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921247409.8U CN210656457U (en) | 2019-08-02 | 2019-08-02 | Circulating well repair system for underground water organic pollutants |
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| CN201921247409.8U CN210656457U (en) | 2019-08-02 | 2019-08-02 | Circulating well repair system for underground water organic pollutants |
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| CN210656457U true CN210656457U (en) | 2020-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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- 2019-08-02 CN CN201921247409.8U patent/CN210656457U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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