CN216847139U - Soil pollution detection device based on dye-enhanced laser fluorescence induction technology - Google Patents
Soil pollution detection device based on dye-enhanced laser fluorescence induction technology Download PDFInfo
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Abstract
The utility model discloses a soil pollution detection device based on a dye-enhanced laser fluorescence induction technology. The soil pollution detection device comprises a drill rod, a laser emitting device, a detection device, a data acquisition and processing device and a control device; the water phase solvent conveying pipeline, the hydrophobic dye conveying pipeline and the terminal mixing device are arranged in the drill rod, the tail ends of the water phase solvent conveying pipeline and the hydrophobic dye conveying pipeline are respectively connected with the terminal mixing device, the terminal mixing device is connected with a dye injection port through a pipeline, and the dye injection port extends out of the drill rod and is located below the probe. The device is a soil pollution real-time in-situ detection device, hydrophobic dye is injected through a dye injection port arranged in front of a sapphire lens, NAPLs types which cannot be identified by the traditional LIF device can be detected, and meanwhile, the device can detect a DNAPL layer as thin as 1 mm.
Description
Technical Field
The utility model relates to the technical field of environmental investigation and restoration, in particular to a soil pollution detection device based on a dye-enhanced laser fluorescence induction technology.
Background
In the traditional site investigation method, if a drilling device is used for taking a soil core and a monitoring well is installed to collect a sample and send the sample to a laboratory for analysis, the analysis period is long, only a result of point-like information can be obtained, and the pollution range of the object cannot be quickly and effectively determined on site. Particularly, for an organic pollution site, the existence and migration forms of Non-aqueous Phase Liquids (NAPLs) pollutants in the underground environment are greatly different from those of inorganic pollutants, and are often Non-uniform, so that many data points are needed for sufficient delineation, and therefore, the distribution of the NAPLs in the underground is difficult to be checked by the traditional investigation method.
Compared with the conventional investigation technology, the in-situ real-time monitoring technology has obvious advantages and is more suitable for the requirement of site investigation. Laser-induced fluorescence (LIF) is an in-situ monitoring technology for detecting NAPLs (hydrocarbons, phenols with fluorescence effect and the like) in soil and underground water by the principle that substances can generate fluorescence effect under excitation light induction excitation. Compared with the commonly used detection technology, the laser-induced fluorescence detection is characterized in that the laser-induced fluorescence detection emits light with different directions and different wavelengths from the excitation light with strong directivity and monochromaticity, so that the detection sensitivity is extremely high, and is 2-3 orders of magnitude higher than that of the commonly used ultraviolet and visible light absorption detection. However, since it can only detect NAPLs having a fluorescence effect, and it cannot detect halogenated hydrocarbon DNAPL (lacking fluorophores required for detection using LIF), there is a certain limitation in soil and groundwater investigation.
Aiming at the problem that the traditional laser-induced fluorescence detection cannot identify underground halohydrocarbon DNAPL and other NAPLs which do not fluoresce naturally, the utility model provides a soil pollution detection device based on a dye-enhanced laser fluorescence induction technology.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the technical problems of non-fluorophore and halogenated hydrocarbon which cannot be detected by using a conventional LIF device in the current pollution site investigation process. Therefore, the utility model provides a soil pollution detection device based on a dye-enhanced laser fluorescence induction technology.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a soil pollution detection device based on dye-enhanced laser fluorescence induction technology comprises a drill rod, a laser emitting device, a detection device, a data acquisition and processing device and a control device; a probe is arranged on a drill bit of the drill rod, the laser emitting device emits pulse laser signals to be transmitted to the probe, the probe receives fluorescent signals emitted by surrounding soil pollutants and transmits the fluorescent signals to the detection device, and the detection device is connected with the data acquisition and processing device; the control device is respectively connected with the laser emitting device and the detection device;
The water phase solvent conveying pipeline, the hydrophobic dye conveying pipeline and the terminal mixing device are arranged in the drill rod, the tail ends of the water phase solvent conveying pipeline and the hydrophobic dye conveying pipeline are respectively connected with the terminal mixing device, the terminal mixing device is connected with a dye injection port through a pipeline, and the dye injection port extends out of the drill rod and is located below the probe.
Furthermore, a camera for capturing a fluorescent image of the surrounding soil pollutants is arranged above the probe.
Furthermore, the water phase solvent conveying pipeline and the hydrophobic dye conveying pipeline are respectively connected with respective injection pumps, the two injection pumps are respectively connected with the control device, and the two injection pumps are respectively connected with the data acquisition and processing device.
Furthermore, the probe is connected with an excitation optical fiber and a collection optical fiber, the excitation optical fiber is connected with the laser emission device, the collection optical fiber is connected with the detection device, the excitation optical fiber transmits laser signals to the probe, and the collection optical fiber transmits fluorescence signals to the detection device.
Furthermore, a sapphire lens is installed at the front end of the probe.
Furthermore, a reflector for changing the direction of the laser is arranged in the probe.
Dye enhanced laser induced fluorescence (DyeLIF) is a novel site characterization method for high resolution three-dimensional subsurface mapping of subsurface halocarbon DNAPL and other non-naturally fluorescent NAPLs. In contrast to LIF, dyellif does not require NAPLs to contain natural fluorophores (e.g., infrared compounds such as polycyclic aromatic hydrocarbons [ PAHsl ]), and thus can be used to detect halogenated hydrocarbons and other non-fluorophore NAPLs that were previously undetectable using conventional LIF tools. While the dyellif technique is capable of detecting sub-centimeter thick layers of DNAPL and provides soil relative permeability information by pressure/flow rate logging during dye injection.
The beneficial effects of the utility model are: the utility model has simple structure and the following advantages:
(1) the device is a real-time in-situ soil pollution detection device, hydrophobic dye is injected through a dye injection port arranged in front of a sapphire lens, NAPL types which cannot be seen by a traditional LIF device can be detected, and meanwhile, a DNAPL layer as thin as 1 mm can be detected by the device;
(2) the device provided by the utility model provides a real-time in-situ detection method, so that the problem of soil core recovery of the traditional off-site colorimetric dye test does not exist, 100% representation of a detection interval can be realized, and the device has the remarkable advantages of higher continuity rate, higher data density, automatic electronic recording result and no waste;
(3) the device mixes the dye and the water through the terminal mixing device to form a mixture, the mixture is injected into the soil, the data acquisition and processing device records the data of the injection amount and the pressure measurement, and extra high-resolution lithology information and soil hydraulic conductivity can be obtained through processing, so that continuous vertical section analysis on the generation and distribution of the lithology of the soil and DNAPL is facilitated;
(4) the camera is arranged on the upper part of the probe, so that the existence and distribution conditions of the non-fluorophore and the chlorinated solvent can be reflected more intuitively;
(5) Unlike MIPs and other direct propulsion tools, which can only indirectly infer the existence of DNAPL, the special hydrophobic dye has a specific reaction on NAPL phase, so that VOCs and DNAPL in high-concentration dissolved phases can be distinguished;
(6) the device of the utility model does not generate Investigation Derived Waste (IDW), and the detection result can be used for determining the specific position and depth of soil sample collection, thereby reducing the investigation cost.
Drawings
The utility model is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a schematic diagram of the present invention.
In the figure: 1. the system comprises a water phase solvent conveying pipeline, 2 a hydrophobic dye conveying pipeline, 3 a terminal mixing device, 4 a dye injection port, 5 a sapphire lens, 6 a reflector, 7 a probe, 8 a camera, 9 an excitation optical fiber, 10 an acquisition optical fiber, 11 a detection device, 12 a data acquisition and processing device, 13 a laser emission device, 14 a control device, 15 a drill rod, 16 a ground and 17 an injection pump.
Detailed Description
The utility model will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology shown in fig. 1 comprises a drill rod 15, a laser emitting device 13, a detection device 11, a data acquisition and processing device 12 and a control device 14; a probe 7 is arranged on a drill bit of the drill rod 15, a laser emitting device 13 emits pulse laser signals to be transmitted to the probe 7, the probe 7 receives fluorescent signals emitted by surrounding soil pollutants and transmits the fluorescent signals to a detection device 11, and the detection device 11 is connected with a data acquisition and processing device 12; the control device 14 is respectively connected with the laser emitting device 13 and the detection device 11;
the inside water phase solvent pipeline 1, hydrophobic nature dyestuff pipeline 2 and the terminal mixing device 3 that have of drilling rod 15, the end of water phase solvent pipeline 1 and hydrophobic nature dyestuff pipeline 2 is connected with terminal mixing device 3 respectively, and terminal mixing device 3 has dyestuff injection port 4 through the tube coupling, and dyestuff injection port 4 stretches out drilling rod 15 and is located probe 7 below.
The laser emitting device 13, the detection device 11, the data acquisition and processing device 12 and the control device 14 are prior art, and adopt the structure disclosed by the patent number 2018217022463 with the patent name of being a soil pollution real-time in-situ detection device based on the laser fluorescence induction technology.
A camera 8 for capturing fluorescent images of the surrounding soil contaminants is positioned 20 cm above the probe 7.
The water phase solvent conveying pipeline 1 and the hydrophobic dye conveying pipeline 2 are respectively connected with respective injection pumps 17, the two injection pumps 17 are respectively connected with the control device 14, and the two injection pumps 17 are respectively connected with the data acquisition and processing device 12.
The probe 7 is connected with an excitation optical fiber 9 and a collection optical fiber 10, the excitation optical fiber 9 is connected with a laser emitting device 13, the collection optical fiber 10 is connected with a detection device 11, the excitation optical fiber 9 transmits laser signals to the probe 7, and the collection optical fiber 10 transmits fluorescence signals to the detection device 11.
The front end of the probe 7 is provided with a sapphire lens 5.
The probe 7 is provided with a reflecting mirror 6 for changing the direction of the laser beam, and the reflecting mirror 6 reflects the laser beam in the vertical direction into the laser beam 3 in the horizontal direction.
The operation method of the soil pollution detection device based on the dye-enhanced laser fluorescence induction technology comprises the following steps:
(1) the drilling machine presses the drill rod 15 into the ground 16, and when the drill bit of the drill rod 15 reaches a required position, the drilling machine is connected with the control device 14, and the control device 14 controls the drilling machine to work;
(2) the control device 14 controls the two injection pumps 17 to work, the water phase solvent conveying pipeline 1 and the hydrophobic dye conveying pipeline 2 are respectively filled with the water phase solvent and the hydrophobic dye, the water phase solvent and the hydrophobic dye are mixed in the terminal mixing device 3 and are injected into the surrounding soil through the dye injection port 4, and the data acquisition and processing device 12 respectively records the flow rates of the water phase solvent and the hydrophobic dye;
(3) Injecting a mixture formed by the aqueous phase solvent and the hydrophobic dye into the surrounding soil, wherein if the mixture permeates into the soil containing NAPL, the injected mixture can be dissolved into NAPL within a few milliseconds, an excitation optical fiber 9 transmits a laser signal to a probe 7, intense fluorescence is generated after the soil is irradiated by the laser, and the probe 7 collects the fluorescence signal and transmits the fluorescence signal to a detection device 11 through a collection optical fiber 10; meanwhile, the camera 8 shoots soil layer pictures, stores the soil layer pictures in a memory card, and guides out and collects the soil layer pictures after the soil layer pictures are detected;
(4) after the detection device 11 detects and analyzes the fluorescence signal, the data is transmitted to the data acquisition and processing device 12, and the data acquisition and processing device 12 acquires a fluorescence spectrogram.
Examples
Halogenated hydrocarbon pollution exists in a certain chemical plant, but the specific position and depth are unknown, and the large-scale site encryption and stationing detection cost is higher, so the soil pollution detection device based on the dye-enhanced laser fluorescence induction technology is sampled to carry out in-situ real-time detection so as to quickly determine the pollution range. The device is deployed on a direct-push drilling machine, and the hydraulic power of the direct-push drilling machine provides power for soil layer drilling of the device. Meanwhile, the special hydrophobic dye and the aqueous phase solvent are injected into the conveying pipeline at a certain speed and concentration through the injection pump 17, stirred and mixed in the inner cavity of the end terminal mixing device 3 at the tail end of the pipeline, and then conveyed to the dye injection port 4. The mixture is injected at a target flow rate of 1 milliliter per second (mL/s), and the proportion of the dye in the dye injection port 4 is adjusted by controlling the flow rates of the two liquid conveying pipelines and the concentration of the dye so as to adapt to plots with different pollution degrees and soil layer properties. The mixture is injected into the surrounding soil, if the mixture permeates into the soil containing NAPL, the injected mixture can be dissolved into NAPL within a few milliseconds, the excitation optical fiber 9 transmits a laser signal to the probe 7, strong fluorescence is generated after the soil is irradiated by the laser, the probe 7 collects the fluorescence signal and transmits the fluorescence signal to the detection device 11 through the collection optical fiber 10; meanwhile, the camera 8 shoots soil layer pictures, the soil layer pictures are stored in the memory card, and after the detection is finished, the soil layer pictures are exported and collected. The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology can clearly reflect the pollution range and depth of pollutants in a soil layer through a fluorescence spectrogram and a photo, and can laterally reflect the lithology, permeability and other parameters of the soil layer.
While particular embodiments of the present invention have been described in the foregoing specification, the present invention is not limited to the specific embodiments, and modifications and variations of the foregoing detailed description can be made by those skilled in the art without departing from the spirit and scope of the utility model.
Claims (6)
1. A soil pollution detection device based on dye-enhanced laser fluorescence induction technology comprises a drill rod (15), a laser emitting device (13), a detection device (11), a data acquisition processing device (12) and a control device (14); a probe (7) is arranged on a drill bit of the drill rod (15), a laser emission device (13) emits pulse laser signals to be transmitted to the probe (7), the probe (7) receives fluorescent signals emitted by surrounding soil pollutants and transmits the fluorescent signals to a detection device (11), and the detection device (11) is connected with a data acquisition and processing device (12); the control device (14) is respectively connected with the laser emitting device (13) and the detection device (11); the method is characterized in that:
the water-phase solvent injection device is characterized in that a water-phase solvent conveying pipeline (1), a hydrophobic dye conveying pipeline (2) and a terminal mixing device (3) are arranged in the drill rod (15), the tail ends of the water-phase solvent conveying pipeline (1) and the hydrophobic dye conveying pipeline (2) are respectively connected with the terminal mixing device (3), the terminal mixing device (3) is connected with a dye injection port (4) through a pipeline, and the dye injection port (4) stretches out of the drill rod (15) and is located below the probe (7).
2. The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology according to claim 1, wherein: a camera (8) for capturing a fluorescent image of the surrounding soil pollutants is arranged above the probe (7).
3. The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology according to claim 1, wherein: the water phase solvent conveying pipeline (1) and the hydrophobic dye conveying pipeline (2) are respectively connected with respective injection pumps (17), the two injection pumps (17) are respectively connected with the control device (14), and the two injection pumps (17) are respectively connected with the data acquisition and processing device (12).
4. The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology according to claim 1, wherein: the probe (7) is connected with an excitation optical fiber (9) and a collection optical fiber (10), the excitation optical fiber (9) is connected with a laser emitting device (13), the collection optical fiber (10) is connected with a detection device (11), the excitation optical fiber (9) transmits laser signals to the probe (7), and the collection optical fiber (10) transmits fluorescence signals to the detection device (11).
5. The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology according to claim 1, wherein: and a sapphire lens (5) is arranged at the front end of the probe (7).
6. The soil pollution detection device based on the dye-enhanced laser fluorescence induction technology according to claim 1, wherein: the probe (7) is internally provided with a reflector (6) for changing the direction of the laser.
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| CN115290619A (en) * | 2022-08-05 | 2022-11-04 | 南京贻润环境科技有限公司 | Method and device for detecting colloidal active carbon in soil or underground water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115290619A (en) * | 2022-08-05 | 2022-11-04 | 南京贻润环境科技有限公司 | Method and device for detecting colloidal active carbon in soil or underground water |
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