CN115921511B - Accurate detection, extraction and repair method for LNAPL pollution source in groundwater - Google Patents

Accurate detection, extraction and repair method for LNAPL pollution source in groundwater Download PDF

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CN115921511B
CN115921511B CN202310166135.4A CN202310166135A CN115921511B CN 115921511 B CN115921511 B CN 115921511B CN 202310166135 A CN202310166135 A CN 202310166135A CN 115921511 B CN115921511 B CN 115921511B
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lnapl
extraction
osmometer
distance
ground
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CN115921511A (en
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代佳宁
马骏
周磊
王雪
任志敏
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Baohang Environment Restoration Co ltd
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Abstract

The invention discloses a precise detection, extraction and repair method for an LNAPL pollution source in groundwater, which comprises the steps of obtaining the distance between an LNAPL and an air interface to the ground according to a monitoring unit
Figure ZY_1
Is arranged at the burial depth of the appointed osmometer
Figure ZY_2
Pressure of osmometer at location
Figure ZY_3
The method is convenient to operate, and compared with periodic extraction, continuous extraction has less disturbance on LNAPL pollution sources, so that the repair rate is improved, and the treatment effect is ensured.

Description

Accurate detection, extraction and repair method for LNAPL pollution source in groundwater
Technical Field
The invention belongs to the technical field of groundwater pollution control, and relates to a precise detection, extraction and repair method for an LNAPL pollution source in groundwater.
Background
LNAPL in groundwater exists at the upper interface of a groundwater aquifer and is the most important pollution source for groundwater pollution.
When the polluted land block with LNAPL in groundwater is faced, the LNAPL which can flow freely is repaired as much as possible under the condition of disturbing groundwater environment as much as possible. Because the concentration of the pollutants at the LNAPL is extremely high, the pollutants are mainly extracted to the ground surface in a low-flow-rate mode for recovery or subsequent treatment, and soil or groundwater polluted by the LNAPL is subsequently repaired by adopting other technical methods such as heat treatment, in-situ bioremediation, in-situ chemical repair, in-situ electric repair and the like.
There is a large difference between LNAPL extraction and contaminated groundwater extraction techniques. Firstly, in the extraction process, the fluctuation of the depth of the LNAPL is caused to be as small as possible, so that the free-flowing LNAPL is prevented from contacting and being adsorbed in stratum soil with other depths, and the difficulty of repairing treatment is increased.
At present, the related LNAPL extraction technology in groundwater mainly aims at the situation that the occurrence depth and thickness of the LNAPL are determined, and extraction of corresponding states is carried out. Patent CN107935066a discloses a pollution remediation system and method for LNAPL in groundwater based on pollution control, the remediation system comprising a vertical barrier wall, a pump-out treatment unit and a recharging system. However, from the experience and case situation of restoration of pollution sources of groundwater LNAPL for many years at home and abroad, the situation that the LNAPL in the nearby area is desorbed in soil and migrates and diffuses again often occurs after the LNAPL in the underground water extraction well and the nearby area is extracted, so that the restoration period is prolonged often due to the fact that lower-stage restoration decisions are carried out by stage standing and observing the LNAPL situation in the groundwater.
Therefore, there is a need to design a method for accurately detecting, extracting and repairing LNAPL pollution sources in groundwater, so as to solve the technical problems existing at present.
Disclosure of Invention
The invention aims at solving the technical problems, and provides the accurate detection, extraction and repair method for the LNAPL pollution source in the underground water, which has the advantages of reasonable structure, convenience in operation, and less disturbance on the LNAPL pollution source due to continuous extraction compared with periodic extraction, so that the repair rate is improved, and the treatment effect is ensured.
In order to solve the technical problems, the invention provides the accurate detection, extraction and repair method for the LNAPL pollution source in the groundwater, which is used for obtaining the distance between the LNAPL and the air interface to the ground according to the monitoring unit
Figure SMS_1
Is arranged at the depth of the appointed osmometer>
Figure SMS_2
Pressure of osmometer in position +.>
Figure SMS_3
Controlling the suction speed of the LNAPL and the position of the oil inlet of the extraction pipe, so that the distance between the oil inlet of the extraction pipe and the ground is smaller than the distance between the LNAPL and the water interface and the ground, and the distance between the oil inlet of the extraction pipe and the ground is larger than the distance between the LNAPL and the air interface and the ground; wherein the distance between the LNAPL and the air interface to the ground is +.>
Figure SMS_4
The distance between the LNAPL and the water interface to the ground is +.>
Figure SMS_5
And->
Figure SMS_6
And (3) summing; thickness of LNAPL->
Figure SMS_7
The method comprises the following steps:
Figure SMS_8
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_9
is the burial depth of the osmometer (i.e. the distance from the osmometer to the ground), m; />
Figure SMS_10
Is the liquid level burial depth (i.e. the distance from the LNAPL to the air interface to the ground), m;
Figure SMS_11
is the measured pressure of the osmometer, pa;
Figure SMS_12
is the density of water, t/m 3 ；
Figure SMS_13
Is the density of LNAPL, t/m 3 ；
Figure SMS_14
Is the acceleration of gravity, N/kg.
In some embodiments, the osmometer burial depth
Figure SMS_15
：
Figure SMS_16
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_17
is the thickness of the LNAPL to water interface to the osmometer.
In some embodiments of the present invention, in some embodiments,
Figure SMS_18
：
Figure SMS_19
preferably, in some embodiments, the oil inlet of the extraction tube is located 2-5mm above the LNAPL and water interface.
In some embodiments, the monitoring unit comprises an osmometer and an infrared rangefinder, wherein the osmometer is fixed on the underside of the LNAPL-water interface, and the infrared rangefinder is disposed on the upper edge of the extraction well to monitor the liquid level depth of the LNAPL (i.e., the distance of the LNAPL-air interface to the surface).
In some embodiments, the upper end of the extraction tube is configured with a drive motor to control the position of the oil inlet at the lower end.
In some embodiments, the oil inlet is configured with a filter to prevent large particles from entering the extraction tube.
In some embodiments, the upper edge of the extraction well is configured with a three-phase separator tank; the upper part of the three-phase separation box is an air part, and the extraction pipe is connected with the air part and is provided with negative pressure by a vacuum fan to realize liquid extraction; the lower part of the three-phase separation box is a liquid collecting part for collecting LNAPL and a water phase.
In some embodiments, a float switch is configured inside the three-phase separation tank, and the float switch is disposed above the LNAPL liquid level to prevent the liquid level from being higher than the extraction liquid inlet of the three-phase separation tank.
In some embodiments, the extraction is initiated when the LNAPL is greater than 20mm thick; when the LNAPL thickness was less than 2-5mm, the extraction was stopped.
The invention has the beneficial effects that:
compared with extraction in the prior art, the accurate detection, extraction and repair method for the LNAPL pollution source in the underground water has the advantages that the structure is reasonable, the operation is convenient, the occurrence (residual) state of the LNAPL pollution source including the thickness of the LNAPL can be perceived in real time, the LNAPL is prevented from being extracted too fast by adjusting the pumping speed and the oil inlet position, the underground hydraulic disturbance is caused to be too large, the oil stain absorption influence range is enlarged, the disturbance on the LNAPL pollution source is smaller, the repair rate is improved, and the treatment effect is ensured.
Drawings
The above-described advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are meant to be illustrative only and not limiting of the invention, wherein:
FIG. 1 is a schematic diagram of an accurate detection extraction repair system for LNAPL pollution sources in groundwater according to the invention;
FIG. 2 is a statistical graph of LNAPL extraction and repair operations in groundwater corresponding to an extraction well.
Detailed Description
The present invention will be described in detail with reference to specific embodiments and drawings.
The examples described herein are specific embodiments of the present invention, which are intended to illustrate the inventive concept, are intended to be illustrative and exemplary, and should not be construed as limiting the invention to the embodiments and scope of the invention. In addition to the embodiments described herein, those skilled in the art can adopt other obvious solutions based on the disclosure of the claims and specification of the present application, including those adopting any obvious substitutions and modifications to the embodiments described herein.
The drawings in the present specification are schematic views, which assist in explaining the concept of the present invention, and schematically show the shapes of the respective parts and their interrelationships. Note that, in order to clearly show the structures of the components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
FIG. 1 is a schematic diagram of an accurate detection, extraction and repair system for an LNAPL pollution source in groundwater, which is provided by an embodiment of the invention, the accurate detection, extraction and repair system for the LNAPL pollution source in groundwater comprises an extraction well 10, a three-phase separation tank 20 is arranged at the upper edge of the extraction well, the upper part of the three-phase separation tank 20 is an air part, and a vacuum fan provides negative pressure to realize liquid extraction; the lower part of the three-phase separator tank 20 is a liquid collecting part for collecting the LNAPL and the aqueous phase.
Further, the air part of the three-phase separation tank 20 is connected with an extraction pipe 30, that is, the extraction pipe 30 is connected with the air part of the three-phase separation tank 20; specifically, the extraction pipe 30 is placed in the vertical direction in the extraction well 10 to extract the LNAPL in the groundwater according to the set conditions.
Further, the accurate detection, extraction and repair system for the LNAPL pollution source in the groundwater further comprises a monitoring unit, wherein the monitoring unit comprises an osmometer 41 and an infrared distance meter 42, the osmometer 41 is fixed on the lower side of the interface between the LNAPL and the water, the burial depth (i.e. the distance from the osmometer to the ground) of the osmometer is a fixed value appointed in advance and is larger than the depth of the interface between the LNAPL and the water, which is investigated in the earlier stage, and the infrared distance meter 42 is arranged on the upper edge of the extraction well 10 so as to monitor the liquid level depth of the LNAPL (i.e. the distance between the LNAPL and the air interface to the ground).
Meanwhile, the invention provides a method for accurately detecting, extracting and repairing the LNAPL pollution source in the groundwater, which obtains the distance between the LNAPL and the air interface to the ground according to a monitoring unit
Figure SMS_20
Is arranged at the depth of the appointed osmometer>
Figure SMS_21
Pressure of osmometer in position +.>
Figure SMS_22
Controlling LNAPL suctionThe speed and the position of the oil inlet of the extraction pipe are such that the distance between the oil inlet of the extraction pipe and the ground is smaller than the distance between the LNAPL and the water interface and the ground, and the distance between the oil inlet of the extraction pipe and the ground is larger than the distance between the LNAPL and the air interface and the ground; wherein the distance between the LNAPL and the air interface to the ground is +.>
Figure SMS_23
The distance between the LNAPL and the water interface to the ground is +.>
Figure SMS_24
And->
Figure SMS_25
And (3) summing; thickness of LNAPL->
Figure SMS_26
The method comprises the following steps:
Figure SMS_27
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_28
is the burial depth of the osmometer (i.e. the distance from the osmometer to the ground), m;
Figure SMS_29
is the liquid level burial depth (i.e. the distance from the LNAPL to the air interface to the ground), m;
Figure SMS_30
is the measured pressure of the osmometer, pa;
Figure SMS_31
is the density of water, t/m 3 ；
Figure SMS_32
Is the density of LNAPL, t/m 3 ；
Figure SMS_33
Is the acceleration of gravity, N/kg.
In some embodiments, the osmometer burial depth
Figure SMS_34
：
Figure SMS_35
Wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure SMS_36
is the thickness of the LNAPL to water interface to the osmometer.
In some embodiments of the present invention, in some embodiments,
Figure SMS_37
：/>
Figure SMS_38
as one embodiment of the invention, the oil inlet of the extraction pipe is positioned 2-5mm above the interface of the LNAPL and water.
In the embodiment shown in fig. 1, the upper end of the extraction pipe 30 is provided with a drive motor 31 to control the position of the oil inlet at the lower end. By means of an automatic detection and control system, continuous extraction operation and operation can be enhanced, and repair treatment efficiency is improved.
Further, the oil inlet of the extraction tube 30 is provided with a filter 32 to prevent large particles from entering the extraction tube and to prevent the large particles from blocking the pipe of the extraction tube 30.
As an embodiment of the present invention, a float switch 20a is disposed in the three-phase separation tank 20, and the float switch 20a is disposed above the LNAPL liquid level to prevent the liquid level from being higher than the extraction liquid inlet of the three-phase separation tank.
Embodiment one:
in the same pollution plume area, 2 underground water LNAPL pollution layer extraction wells, namely CC-1 and CC-2, are arranged at the underground oil pollution leakage position of a petrochemical group. The caliber of the extraction well is 200mm, the depth is 12m, the liquid level burial depth of the LNAPL is 5m, the LNAPL is petroleum hydrocarbon substance, the thickness is 1m, namely the distance from the interface of the LNAPL and water to the ground is 6m.
Wherein, the CC-1 is taken out and is set up the immersible pump in the well, pump depth 7m. A floating ball start-stop controller is arranged in the well, and the submersible pump is started when the underground liquid level is restored to the depth of 6.5 m; the underground liquid level is automatically stopped when it falls to 7m. The maximum flow of the submersible pump is 2m 3 Per hour, the flow rate under the normal working condition is 0.1-0.5 m 3 /h。
Wherein, set up this patent complete set LNAPL pollution source accurate detection extraction equipment in CC-2, osmometer burial depth
Figure SMS_39
The oil inlet is arranged at the position 8m away from the ground, and the initial arrangement of the oil inlet is positioned at the position 2-5mm away from the interface of the LNAPL and water, and the tolerance error is +/-1 mm. The vacuum pump is set to be started and stopped, and the LNAPL is started to be extracted when the thickness of the LNAPL layer exceeds 20 mm; when the LNAPL layer thickness was less than 2-5mm, the extraction was stopped. The LNAPL power source is a vacuum pump, the vacuum degree is 90-95%, the flow can be regulated through a one-way valve, and the flow under the conventional working condition is 10-50L/h.
The two extraction wells are respectively provided with an oil-water separation tank, and the collected and extracted LNAPL operates for 1 week in the field extraction operation.
FIG. 2 is a statistical chart of LNAPL extraction and repair operations in groundwater corresponding to an extraction well, wherein the total amount of LNAPL extracted by a CC-1 monitoring well adopting a conventional submersible pump method is 2.0m 3 Pumping out the underground water quantity 56m 3 The method comprises the steps of carrying out a first treatment on the surface of the CC-2 monitoring well adopting LNAPL pollution source accurate detection extraction equipment extracts total LNAPL of 3.4m 3 Pumping out the underground water quantity of 4m 3 。
Compared with the traditional submersible pump mode, the LNAPL extraction efficiency of the invention is about 85%, and the sewage treatment capacity is reduced by about 93%.
Compared with the defects and shortcomings of the prior art, the accurate detection, extraction and repair method for the LNAPL pollution source in the underground water is reasonable in structure, convenient to operate, and less in disturbance on the LNAPL pollution source due to continuous extraction compared with periodic extraction, so that the repair rate is improved, and the treatment effect is guaranteed.
The present invention is not limited to the above embodiments, and any person can obtain other products in various forms under the teaching of the present invention, however, any changes in shape or structure of the products are included in the scope of protection of the present invention, and all the products having the same or similar technical solutions as the present application are included in the present invention.

Claims (6)

1. A precise detection, extraction and repair method for an LNAPL pollution source in groundwater is characterized in that a distance D between the LNAPL and an air interface to the ground is obtained according to a monitoring unit surf Is arranged at the burial depth D of the appointed osmometer piz Pressure P of osmometer at location piz Controlling the suction speed of the LNAPL and the position of the oil inlet of the extraction pipe, so that the distance between the oil inlet of the extraction pipe and the ground is smaller than the distance between the LNAPL and the water interface and the ground, and the distance between the oil inlet of the extraction pipe and the ground is larger than the distance between the LNAPL and the air interface and the ground; wherein the distance between the LNAPL and the air interface to the ground is D surf The distance between the LNAPL and the water interface to the ground is D surf And Th (Th) LN And (3) summing; thickness Th of LNAPL LN The method comprises the following steps:
Figure QLYQS_1
wherein D is piz Is the burial depth, m, of the osmometer;
D surf the distance between the LNAPL and the air interface to the ground is m;
P piz is the measured pressure of the osmometer, pa;
ρ Wa is the density of water, t/m3;
ρ LN is the density of LNAPL, t/m3;
g is the acceleration of gravity, N/kg;
osmometer burial depth D piz ：
D piz ＝Th LN +Th wa +D surf
Wherein Th is Wa Is the thickness from the interface of LNAPL and water to osmometer
P piz ：
P piz ＝ρ LN gTh LN +ρ Wa gTh Wa
The monitoring unit comprises an osmometer and an infrared range finder, wherein the osmometer is fixed on the lower side of the interface between the LNAPL and water, and the infrared range finder is arranged on the upper edge of the extraction well so as to monitor the distance between the LNAPL and the air interface and the ground;
the upper end of the extraction pipe is provided with a driving motor to control the position of an oil inlet at the lower end.
2. The method for accurately detecting, extracting and repairing the LNAPL pollution source in the underground water according to claim 1, wherein the oil inlet of the extracting tube is positioned at a position 2-5mm above the interface of the LNAPL and the water.
3. The method for accurately detecting, extracting and repairing the LNAPL pollution source in the underground water according to claim 1, wherein the oil inlet is provided with a filter for preventing large particles from entering the extraction pipe.
4. The method for accurately detecting, extracting and repairing the LNAPL pollution source in the underground water according to claim 1, wherein a three-phase separation box is arranged at the upper edge of the extraction well; the upper part of the three-phase separation box is an air part, and the extraction pipe is connected with the air part and is provided with negative pressure by a vacuum fan to realize liquid extraction; the lower part of the three-phase separation box is a liquid collecting part for collecting LNAPL and a water phase.
5. The method for accurately detecting, extracting and repairing the LNAPL pollution source in the groundwater according to claim 4, wherein a float switch is arranged in the three-phase separation tank, and the float switch is arranged above the liquid level of the LNAPL to prevent the liquid level from being higher than an extraction liquid inlet of the three-phase separation tank.
6. The method for accurately detecting, extracting and repairing the pollution source of the LNAPL in the groundwater according to claim 1, wherein when the thickness Th of the LNAPL is LN When the diameter is larger than 20mm, starting extraction; thickness Th of LNAPL LN And stopping extraction when the diameter is smaller than 2-5 mm.
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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6928862B1 (en) * 2003-12-04 2005-08-16 Bryce V. Robbins Method of monitoring dual-phase liquid and interface levels
WO2016141202A1 (en) * 2015-03-03 2016-09-09 ARCADIS Corporate Services, Inc. System and method for measuring non-aqueous phase liquid accumulations in monitoring wells at contaminated sites
CN207845303U (en) * 2017-11-28 2018-09-11 天津蓝天环科环境科技股份有限公司 Lightweight nonaqueous phase liquid extracts processing system in a kind of underground water
US11231339B2 (en) * 2018-03-16 2022-01-25 Aecom Systems and methods for determining a thickness of a nonaqueous phase liquid layer
CN212843828U (en) * 2020-07-15 2021-03-30 北京高能时代环境技术股份有限公司 Monitoring and extracting equipment for repairing non-aqueous phase liquid polluted underground water
CN112142160A (en) * 2020-09-07 2020-12-29 南京万德斯环保科技股份有限公司 AS/MPE combined repairing system and method for underground water polluted by LNAPL
CN113087043B (en) * 2021-04-25 2022-06-21 清华大学 Device and method for repairing underground water polluted by LNAPL (Low noise alkaline peroxide solution)
CN114923661B (en) * 2022-05-01 2024-06-11 长江水利委员会长江科学院 Radial well flow test system and method for implantable relief well
CN115165974A (en) * 2022-07-12 2022-10-11 华北水利水电大学 LNAPL migration monitoring device and data processing method thereof

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