CN212442543U - System for comprehensive treatment of saturated zone and aeration zone - Google Patents

System for comprehensive treatment of saturated zone and aeration zone Download PDF

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Publication number
CN212442543U
CN212442543U CN202020449630.8U CN202020449630U CN212442543U CN 212442543 U CN212442543 U CN 212442543U CN 202020449630 U CN202020449630 U CN 202020449630U CN 212442543 U CN212442543 U CN 212442543U
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extraction
napl
gas
phase
well
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张文
王博艺
金增伟
刘爽
张景鑫
王海东
殷晓东
杨勇
黄海
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Zhongke Dingshi Environmental Engineering Co ltd
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Zhongke Dingshi Environmental Engineering Co ltd
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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
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    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The utility model provides a system for comprehensive treatment of a saturated zone and an aeration zone, which comprises an injection system, a multiphase extraction system and a tail gas tail water treatment system, wherein the injection system injects high-pressure air into soil through an air compression device and an injection well; the multiphase extraction system comprises a gas phase extraction well, a multiphase extraction well and a NAPL phase extraction device, wherein the gas phase extraction well is used for extracting polluted gas in soil, a groundwater extraction pipe in the multiphase extraction well can extract polluted water, and the NAPL phase extraction device can accurately extract NAPL phase pollutants; the tail gas tail water treatment system can treat the extracted gas phase, liquid phase and NAPL phase until safe discharge or collection. The utility model discloses an introduce heterogeneous extraction technique and the accurate extraction technique of NAPL and solved the problem of trailing simultaneously in repair time.

Description

System for comprehensive treatment of saturated zone and aeration zone
Technical Field
The utility model relates to a system for extracting and treating soil gas, underground water and floating oil layer in an underground pollution area.
Background
The method is characterized in that a multiphase extraction technology is generally adopted for treating an underground pollution area, namely, soil gas, underground water and a floating oil layer in the underground pollution area are extracted to the ground by a vacuum extraction means to be separated and treated so as to control and repair organic pollutants in the soil and the underground water and achieve the purpose of site repair.
The multiphase extraction has the advantages of small environmental disturbance, simultaneous restoration of underground water and soil and the like, and is suitable for polluted plots of petroleum enterprises, gas stations and the like.
However, because the LNAPL phase (light non-aqueous liquid) floats on groundwater, conventional multiple extraction techniques have difficulty in accurately extracting the LNAPL phase, often causing tailing (i.e., the LNAPL phase accumulates after a period of time after the treatment is completed).
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the system for comprehensive treatment of the saturated zone and the aeration zone is provided, on one hand, the treatment speed is improved, and on the other hand, the tailing phenomenon is eliminated.
In order to achieve the above object, the utility model adopts the following technical scheme:
a system for comprehensive treatment of a saturated zone and an aeration zone is characterized in that: the system comprises an injection system, a multiphase extraction system and a tail gas tail water treatment system, wherein:
the injection system comprises air compression equipment and an injection well, wherein the air compression equipment provides high-pressure air for an air injection pipe, the air injection pipe extends into the depth position below the underground water level line in the injection well, and the screening depth of the injection well is 10-100cm above the highest annual underground water level line;
the multiphase extraction system comprises a gas phase extraction well, a gas phase extraction pipeline, an extraction fan, a multiphase extraction well, a groundwater extraction pipe, an extraction water pump and a NAPL phase extraction device, wherein:
the sieve opening depth of the gas phase extraction well is above the underground water level, the gas phase extraction pipeline is communicated with the extraction fan, and the downstream of the extraction fan is communicated to the bioreactor;
the screen opening depth of the multiphase extraction well is 10-100cm above an underground water level line, the arranged underground water extraction pipe is positioned at an underground water level restoration target depth and is connected with the extraction water pump, and the downstream of the extraction water pump is communicated to the bioreactor;
the NAPL phase extraction device comprises a NAPL extraction pipe and a NAPL extraction pump, the lower end of the NAPL extraction pipe is positioned at the depth position of the NAPL phase, the upper end of the NAPL extraction pipe is connected with the NAPL extraction pump, the downstream of the NAPL extraction pump is connected with a settling tank, the settling tank is provided with a water phase outlet and a NAPL phase outlet, and the water phase outlet is connected with the bioreactor;
the tail gas tail water treatment system comprises the settling tank and the bioreactor.
The system for comprehensive treatment of the saturated zone and the aeration zone comprises: the air compression equipment is connected with a plurality of gas injection pipelines through a gas distributor, and the terminal of each gas injection pipeline is communicated with the injection well through one gas injection pipe.
The system for comprehensive treatment of the saturated zone and the aeration zone comprises: be equipped with vortex street flowmeter, manometer and electrically operated valve on the gas distributor, can evenly distribute the compressed air that air compression equipment produced to each injection well, can also monitor flow and pressure in each gas injection pipeline.
The system for comprehensive treatment of the saturated zone and the aeration zone comprises: and a gas-liquid separator is arranged on the gas-phase extraction pipeline, the separated polluted gas is extracted by the extraction fan and enters the bioreactor for treatment, and the separated polluted liquid is sent to the bioreactor for treatment by a liquid discharge pump.
The system for comprehensive treatment of the saturated zone and the aeration zone comprises: the tail gas tail water treatment system also comprises a NAPL recovery tank, and a NAPL phase outlet of the settling tank is connected with the NAPL recovery tank.
The system for comprehensive treatment of the saturated zone and the aeration zone comprises: the gas phase extraction pipeline is also arranged in the multiphase extraction well, and the gas phase extraction pipeline in the multiphase extraction well is also communicated to the extraction fan.
The system for comprehensive treatment of the saturated zone and the aeration zone comprises: the NAPL phase extraction device comprises a positioner, an online densimeter, the NAPL extraction pipe and the NAPL extraction pump, wherein the online densimeter can detect the depth position of a NAPL phase, the NAPL phase depth position can be fixed on the underground water extraction pipe through the positioner, the underground water extraction pipe is a hose and is connected with a winch, the depth position of the positioner can be controlled through the winch, and the lower end of the NAPL extraction pipe is fixed on the positioner.
The utility model discloses an introduce AS technique and NAPL accurate extraction technique and reduced repair time and solved the problem of trailing simultaneously. Meanwhile, the bioreactor is used as a treatment device for tail gas tail water, so that secondary pollution is avoided, and the overall environmental friendliness of the device is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the system for comprehensive treatment of the saturation zone and the aeration zone provided by the present invention.
FIG. 2 is an enlarged schematic view of the retainer of the NAPL phase extraction apparatus.
Description of reference numerals: an air compression device 1; an injection well 2; a gas distributor 3; a gas injection pipe 4; a gas injection pipe 5; a vapor extraction well 6; a vapor extraction line 7; an extraction fan 8; a multiphase extraction well 9; an underground water extraction pipe 10; an extraction water pump 11; NAPL phase extraction unit 12; a gas-liquid separator 13; a bioreactor 14; a drain pump 15; a positioner 16; an on-line densitometer 17; NAPL extraction tubing 18; NAPL extraction pump 19; a settling tank 20; NAPL recovery tank 21.
Detailed Description
As shown in figure 1, the utility model provides a system that is used for saturation zone and aeration area to synthesize to administer, including injection system, heterogeneous extraction system and tail gas tail water processing system, wherein:
the injection system comprises air compression equipment 1 and an injection well 2, wherein the air compression equipment 1 is connected with a plurality of gas injection pipelines 4 through a gas distributor 3, the terminal of each gas injection pipeline 4 is connected with a gas injection pipe 5, the gas injection pipe 5 extends into the depth position below the underground water line in the injection well 2, and the screening depth of the injection well 2 is 10-100cm above the highest underground water line all the year around, so that the remediation effect of an aeration zone can be achieved at different water levels all the year around; the air compression provides high-pressure air for the air injection pipe 5, and the air injection accelerates the transfer of VOCs pollutants from soil particles or underground water to soil gas; the gas distributor 3 is provided with a vortex shedding flowmeter, a pressure gauge and an electric valve, compressed air generated by the air compression equipment 1 can be uniformly distributed to each injection well 2, and the flow and the pressure in each gas injection pipeline 4 can be monitored;
the multiphase extraction system comprises a gas phase extraction well 6, a gas phase extraction pipeline 7, an extraction fan 8, a multiphase extraction well 9, an underground water extraction pipe 10, an extraction water pump 11 and a NAPL phase extraction device 12, wherein:
the sieve opening depth of the gas phase extraction well 6 is above the underground water level, the gas phase extraction pipeline 7 is communicated with the extraction fan 8 and is used for extracting soil gas polluted by VOCs contained in the soil, a gas-liquid separator 13 is arranged on the gas phase extraction pipeline 7, the separated polluted gas is extracted and enters a bioreactor 14 for treatment, and the separated polluted liquid is sent to the bioreactor 14 for treatment through a liquid discharge pump 15; the bioreactor 14 can treat tail gas and tail water simultaneously, so that the cost is saved, and the occupied area of equipment is also saved;
the screen opening depth of the multiphase extraction well 9 is 10-100cm above the underground water level line so as to achieve the accurate extraction effect on LNAPL at different water levels all year round, wherein the arranged underground water extraction pipe 10 is positioned at the underground water level restoration target depth and is connected with the extraction water pump 11, and the extracted water is treated by the bioreactor 14 and then is discharged after reaching the standard;
the gas phase extraction pipeline 7 is also arranged in the multiphase extraction well 9, so that VOCs pollutants volatilized from underground water in the multiphase extraction well 9 can be collected, and pollution gas is prevented from entering soil through sieve holes; the gas phase extraction well 6 and the multiphase extraction well 9 share one extraction fan 8, so that the project cost can be greatly saved;
the multiphase extraction well 9 is also provided with a NAPL phase extraction device 12 for accurately extracting NAPL phase pollutants, the NAPL phase extraction device 12 is composed of a positioner 16, an on-line densimeter 17, a NAPL extraction pipe 18 and a NAPL extraction pump 19, the on-line densimeter 17 is positioned on the positioner 16, the positioner 16 is annular and is sleeved on the lower end of the underground water extraction pipe 10, the underground water extraction pipe 10 is a hose and is connected with a winch, the positioner 16 can be controlled to be positioned at the depth position of the NAPL phase by combining the winch with the on-line densimeter 17, the NAPL extraction pipe 18 is also fixed on the positioner 16, the lower end of the NAPL extraction pipe 18 is exposed out of the positioner 16, the upper end of the NAPL extraction pipe is connected with the NAPL extraction pump 19, the downstream of the NAPL extraction pump 19 is connected with a settling tank 20, the settling tank 20 is provided with an aqueous phase outlet and an NAPL phase outlet, the aqueous phase outlet is connected with the bioreactor 14, the NAPL phase outlet is connected with a NAPL recovery tank 21; when the device is used, the ground control system can control the starting and stopping of the winch according to data fed back by the densimeter so as to control the positioner 16 to accurately stop at the NAPL layer, when the positioner 16 is positioned at the NAPL layer, the NAPL extraction pump 19 starts to work, extracted liquid firstly enters the settling tank 20 to separate a water phase from the NAPL phase, the NAPL phase enters the NAPL recovery tank 21 to be collected, and the water phase enters the bioreactor 14 to be treated;
the tail gas tail water treatment system includes the settling tank 20, the NAPL recovery tank 21, and the bioreactor 14; the settling tank 20 is mainly used for separating the liquid phase extracted by the NAPL phase extraction device 12 from the NAPL phase, the NAPL phase recovery tank is used for storing and recovering the separated NAPL phase, and the bioreactor 14 is used for treating extracted polluted water and polluted gas.
From the above, the utility model has the advantages that:
(1) the system can repair soil and underground water simultaneously.
(2) The system carries out the design of accurate extraction aiming at the groundwater remediation tailing phenomenon caused by NAPL, effectively solves the remediation tailing problem caused by NAPL, and simultaneously completes the resource utilization of NAPL phases.
(3) The injection pipeline is provided with a gas distributor 3 which can uniformly distribute the compressed air generated by the air compression device into each injection well 2 and monitor the flow rate of the pressure machine in each injection well 2.
(4) The system adopts the bioreactor 14 to treat tail water and tail gas, and reduces the operation cost of the system compared with the active carbon adsorption treatment without treating waste active carbon.
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 (7)

1. A system for comprehensive treatment of a saturated zone and an aeration zone is characterized in that: the system comprises an injection system, a multiphase extraction system and a tail gas tail water treatment system, wherein:
the injection system comprises air compression equipment and an injection well, wherein the air compression equipment provides high-pressure air for an air injection pipe, the air injection pipe extends into the depth position below the underground water level line in the injection well, and the screening depth of the injection well is 10-100cm above the highest annual underground water level line;
the multiphase extraction system comprises a gas phase extraction well, a gas phase extraction pipeline, an extraction fan, the multiphase extraction well, a groundwater extraction pipe, an extraction water pump and a NAPL phase extraction device, wherein:
the sieve opening depth of the gas phase extraction well is above the underground water level, the gas phase extraction pipeline is communicated with the extraction fan, and the downstream of the extraction fan is communicated to the bioreactor;
the screen opening depth of the multiphase extraction well is 10-100cm above an underground water level line, the arranged underground water extraction pipe is positioned at an underground water level restoration target depth and is connected with the extraction water pump, and the downstream of the extraction water pump is communicated to the bioreactor;
the NAPL phase extraction device comprises a NAPL extraction pipe and a NAPL extraction pump, the lower end of the NAPL extraction pipe is positioned at the depth position of the NAPL phase, the upper end of the NAPL extraction pipe is connected with the NAPL extraction pump, the downstream of the NAPL extraction pump is connected with a settling tank, the settling tank is provided with a water phase outlet and a NAPL phase outlet, and the water phase outlet is connected with the bioreactor;
the tail gas tail water treatment system comprises the settling tank and the bioreactor.
2. The system for integrated saturated and aerated zones remediation of claim 1, wherein: the air compression equipment is connected with a plurality of gas injection pipelines through a gas distributor, and the terminal of each gas injection pipeline is communicated with the injection well through one gas injection pipe.
3. The system for integrated saturated and aerated zones remediation of claim 2, wherein: be equipped with vortex street flowmeter, manometer and electrically operated valve on the gas distributor, can evenly distribute the compressed air that air compression equipment produced to each injection well, can also monitor flow and pressure in each gas injection pipeline.
4. The system for integrated saturated and aerated zones remediation of claim 1, wherein: and a gas-liquid separator is arranged on the gas-phase extraction pipeline, the separated polluted gas is extracted by the extraction fan and enters the bioreactor for treatment, and the separated polluted liquid is sent to the bioreactor for treatment by a liquid discharge pump.
5. The system for integrated saturated and aerated zones remediation of claim 1, wherein: the tail gas tail water treatment system also comprises a NAPL recovery tank, and a NAPL phase outlet of the settling tank is connected with the NAPL recovery tank.
6. The system for integrated saturated and aerated zones remediation of claim 1, wherein: the gas phase extraction pipeline is also arranged in the multiphase extraction well, and the gas phase extraction pipeline in the multiphase extraction well is also communicated to the extraction fan.
7. The system for integrated saturated and aerated zones remediation of claim 1, wherein: the NAPL phase extraction device comprises a positioner, an online densimeter, the NAPL extraction pipe and the NAPL extraction pump, wherein the online densimeter can detect the depth position of a NAPL phase, the NAPL phase depth position can be fixed on the underground water extraction pipe through the positioner, the underground water extraction pipe is a hose and is connected with a winch, the depth position of the positioner can be controlled through the winch, and the lower end of the NAPL extraction pipe is fixed on the positioner.
CN202020449630.8U 2020-03-31 2020-03-31 System for comprehensive treatment of saturated zone and aeration zone Active CN212442543U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020449630.8U CN212442543U (en) 2020-03-31 2020-03-31 System for comprehensive treatment of saturated zone and aeration zone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020449630.8U CN212442543U (en) 2020-03-31 2020-03-31 System for comprehensive treatment of saturated zone and aeration zone

Publications (1)

Publication Number Publication Date
CN212442543U true CN212442543U (en) 2021-02-02

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