Soil pollution in-situ detection device and method

Abstract

The invention discloses a soil pollution in-situ detection device and method.The detection device comprises a control module, a drill rod mechanism, a first detection module, a second detection module and a third detection module, and the control module is connected with the drill rod mechanism, the first detection module, the second detection module and the third detection module; the first detection module, the second detection module and the third detection module are respectively arranged at the bottom of a drill rod body of the drill rod mechanism; the control module is used for calculating a detection interval according to the real-time pH value and the real-time temperature detected by the first detection module and the second detection module respectively in the drilling process, and controlling the third detection module to detect the soil pollutants according to the detection interval. According to the invention, continuous in-situ detection of soil by each detection module is realized, the detection precision is improved, and the problem of detection result deviation caused by separation of an ex-situ detection method from an original state is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of on-line soil detection, and particularly relates to an in-situ soil pollution detection device and method. Background Art

[0002] With the accelerating pace of urbanization development, the problem of soil pollution prevention has become increasingly important. The sites of retired industrial enterprises may contain a large amount of heavy metal pollutants and organic pollutants. Obtaining the background value of soil pollution is an essential part of subsequent soil remediation.

[0003] At present, there has been a certain development in domestic soil detection, and the detection equipment has been gradually improved. However, most current soil pollution detections are off-site detections, which are separated from the original state, and there are certain deviations in the detection data. Currently, there are also reports on in-situ soil detection equipment, which requires certain knowledge of the strata for fixed-point and fixed-depth detection, with low efficiency and long time consumption. Summary of the Invention

[0004] The purpose of the present invention is to provide an in-situ soil pollution detection device and method to solve the problems that traditional detection methods are mostly off-site detections, resulting in deviations in detection results, and fixed-point and fixed-depth detections with low efficiency and long time consumption.

[0005] The present invention solves the above technical problems through the following technical solutions: An in-situ soil pollution detection device includes a control module, a drill pipe mechanism, a first detection module, a second detection module, and a third detection module. The control module is connected to the drill pipe mechanism, the first detection module, the second detection module, and the third detection module. The first detection module, the second detection module, and the third detection module are respectively arranged at the bottom of the drill pipe body of the drill pipe mechanism.

[0006] The control module is used to control the drill pipe body of the drill pipe mechanism to drill into the soil; calculate the detection interval according to the received real-time pH value and real-time temperature, and control the third detection module to perform soil pollutant detection according to the detection interval, and receive the soil pollutant detection result feedback by the third detection module.

[0007] The first detection module is used to detect the real-time pH value of the soil during the drilling process and feedback the real-time pH value to the control module.

[0008] The second detection module is used to detect the real-time temperature of the soil during the drilling process and feedback the real-time temperature to the control module.

[0009] The third detection module is used to detect soil pollutants under the control of the control module and feedback the soil pollutant detection result to the control module.

[0010] Further, the drill pipe mechanism includes a driving motor, a gearbox, a main shaft, and a drill pipe body. The driving motor is connected to the control module and is used to drive the gearbox. The output end of the gearbox is fixedly connected to the main shaft, and the drill pipe body is provided at the bottom of the main shaft. The driving motor and the gearbox are fixedly arranged on a support.

[0011] Further, the first detection module includes a pH sensor. The pH sensor is arranged inside the drill pipe body, and its probe contacts the soil during the downhole drilling process.

[0012] The second detection module includes a temperature sensor. The temperature sensor is arranged inside the drill pipe body, and its probe contacts the soil during the downhole drilling process.

[0013] Further, the third detection module includes an XRF spectrometer. The XRF spectrometer is arranged inside the drill pipe body, and a transparent detection window is provided on the outer wall of the drill pipe body corresponding to the XRF spectrometer.

[0014] Further, the third detection module is located above the first detection module and the second detection module.

[0015] Further, the control module is a PLC controller.

[0016] Further, the detection device further includes a host computer connected to the control module. The host computer is used to display the detection results.

[0017] Based on the same concept, the present invention further provides a method for in-situ detection of soil pollution, which is applied to the in-situ detection device for soil pollution as described above. The detection method includes:

[0018] Controlling the drill pipe body of the drill pipe mechanism to drill in the soil;

[0019] During the downhole drilling process, obtaining the real-time pH value and real-time temperature of the soil;

[0020] Calculating the detection interval according to the real-time pH value and real-time temperature;

[0021] Controlling the third detection module to perform soil pollutant detection according to the detection interval.

[0022] Further, the PID algorithm is used to calculate the detection interval. The specific calculation formula of the detection interval is:

[0023]

[0024] where, ΔT represents the detection interval; K p represents the proportionality coefficient; e k represents the pH error rate at the kth sampling moment; K Irepresents the integration time constant; e(t) represents the pH error rate at time t, represents the area enclosed by the pH error rate curve from the 0th sampling moment to the kth sampling moment, represents the change rate of the pH error rate; K d represents the differential time constant; t represents time; T k represents the real-time temperature at the kth sampling moment, pH k represents the real-time pH at the kth sampling moment, pH nor represents the one corresponding to pH k corresponding normal soil pH.

[0025] Further, controlling the third detection module to perform soil pollutant detection according to the detection interval includes:

[0026] If the detection interval is greater than or equal to 1, controlling the third detection module to perform soil pollutant detection;

[0027] If the detection interval is less than 1, no soil pollutant detection is performed.

[0028] Beneficial effects

[0029] Compared with the prior art, the advantages of the present invention are as follows:

[0030] The present invention utilizes the drill pipe mechanism to achieve continuous in-situ detection of soil by each detection module, improving the detection accuracy and avoiding the problem of detection result deviation caused by the off-site detection method deviating from the original state; through the drill pipe mechanism, soil detection at different depths is achieved, without the need for detection under the condition of having a certain understanding of the formation, improving the detection efficiency; controlling soil pollutant detection according to the detection interval reduces the detection cost while ensuring the detection accuracy of soil pollutants.

[0031] The present invention is scientific and feasible, reducing the manual construction time and shortening the construction period; through automatic intelligent detection, more reliable soil background information is provided, providing a basis for soil remediation. Description of the drawings

[0032] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only one embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 is a schematic structural diagram of the in-situ soil pollution detection device in the embodiment of the present invention;

[0034] Figure 2It is a schematic diagram of the layout of each detection module in the embodiment of the present invention.

[0035] Explanation of reference numerals: 1 - control module, 2 - drive motor, 3 - drill pipe body, 4 - support, 5 - third detection module, 51 - XRF spectrometer, 52 - transparent detection window, 6 - first detection module, 61 - pH sensor, 7 - display screen, 8 - host computer, 9 - partition board. Detailed implementation manners

[0036] The following combines the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] The following uses specific embodiments to elaborate on the technical solutions of the present application in detail. These several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0038] Embodiment 1

[0039] To solve the deviation problem caused by off-site soil detection, the present invention provides an in-situ soil pollution detection device, which uses a drill pipe mechanism to send each detection module into different depths of the soil to achieve in-situ detection. As Figure 1 shown, the in-situ soil pollution detection device of the present invention includes a control module 1, a drill pipe mechanism, a first detection module 6, a second detection module, and a third detection module 5. The control module 1 is connected to the drill pipe mechanism, the first detection module 6, the second detection module, and the third detection module 5. The first detection module 6, the second detection module, and the third detection module 5 are respectively arranged at the bottom of the drill pipe body 3 of the drill pipe mechanism.

[0040] The first detection module 6 is used to detect the real-time pH value of the soil during the downhole drilling process and feedback the real-time pH value to the control module 1; the second detection module is used to detect the real-time temperature of the soil during the downhole drilling process and feedback the real-time temperature to the control module 1; the second detection module is used to detect soil pollutants under the control of the control module 1 and feedback the soil pollutant detection result to the control module 1.

[0041] The control module 1 is used to control the drill pipe body 3 of the drill pipe mechanism to drill in the soil; calculate the detection interval according to the received real-time pH value and real-time temperature, and control the third detection module 5 to perform soil pollutant detection according to the detection interval, and receive the soil pollutant detection result feedback by the third detection module 5. In this embodiment, the control module 1 adopts a PLC controller.

[0042] The specific working process of the in-situ soil pollution detection device of the present invention is as follows: The drill pipe body 3 is drilled into the soil under the control of the control module 1, and each detection module is sent to different depths of the soil; during the drilling process, the first detection module 6 and the second detection module detect the real-time soil pH value and real-time temperature according to the set sampling interval; the control module 1 calculates the detection interval according to the real-time pH value and real-time temperature, and then controls whether the third detection module 5 performs soil pollutant detection according to the detection interval.

[0043] Soil pollutant detection is usually soil heavy metal concentration detection. Soil heavy metal concentration detection usually uses an XRF spectrometer 51. The XRF spectrometer 51 is expensive, and a light source needs to be consumed every time it is detected, resulting in high detection costs. To solve the problem of high soil heavy metal concentration detection costs, the present invention uses the real-time soil pH value and real-time temperature to determine the detection interval of soil pollutants, and reduces the detection cost while ensuring the detection accuracy of soil pollutants.

[0044] There is a certain correlation between soil pH value and the heavy metal pollutants contained in the soil. When the pH value is neutral or low, the heavy metal concentration will also change accordingly, that is, the soil may be contaminated with heavy metals and heavy metal concentration detection is required; when the pH value is high, there is no heavy metal pollution in the soil and heavy metal concentration detection is not required.

[0045] In the specific embodiment of the present invention, the drill pipe mechanism includes a drive motor 2, a gearbox, a main shaft, and a drill pipe body 3. The drive motor 2 is connected to the control module 1 and is used to drive the gearbox. The output end of the gearbox is fixedly connected to the main shaft, and the drill pipe body 3 is provided at the bottom of the main shaft; the drive motor 2 and the gearbox are fixedly arranged on the support 4. In this embodiment, the drive motor 2 is a variable frequency motor.

[0046] Under the control of the control module 1, the drive motor 2 works, driving the gears in the gearbox to rotate, and driving the drill pipe body 3 to move downward through the rotation of the gears, and the drill pipe body 3 drills into the soil. The detection depth of the soil can be calculated according to the rotation speed and time of the drive motor 2. In this embodiment, the drill pipe body 3 includes a cylindrical main rod and a conical drill bit, and the conical drill bit makes it easier for the drill pipe body 3 to drill into the soil.

[0047] In a specific embodiment of the present invention, the first detection module 6 includes a pH sensor 61 connected to the control module 1. The pH sensor 61 is disposed inside the drill pipe body 3, and its probe contacts the soil during the downhole operation to achieve real-time detection of the soil pH. The pH sensor 61 in this embodiment detects the pH based on the redox reaction: on the outer wall of the probe of the pH sensor 61, two common metals (such as aluminum, copper, iron, aluminum, etc., separated by a rubber gasket between the two metals) contact the soil. The redox reaction between these two metals generates a potential difference signal, and this potential difference signal is processed to obtain the pH.

[0048] The second detection module includes a temperature sensor connected to the control module 1. The temperature sensor is disposed inside the drill pipe body 3, and its probe contacts the soil during the downhole operation to achieve real-time detection of the soil temperature.

[0049] In a specific embodiment of the present invention, the third detection module 5 includes an XRF spectrometer 51 connected to the control module 1. The XRF spectrometer 51 is disposed inside the drill pipe body 3, and a transparent detection window 52 is provided on the outer wall of the drill pipe body 3 corresponding to the XRF spectrometer 51, as Figure 2 shown.

[0050] The XRF spectrometer 51 internally contains an optical processing module, a signal processing module, a controller, and a power supply module. Its working principle is as follows: the X-ray tube generates X-rays under the control of the power supply, and the X-rays are filtered by a primary filter and a primary collimator and then irradiated onto the soil sample at the transparent detection window 52. The fluorescence excited by the sample passes through a secondary collimator and a secondary filter and then reaches the detector. The detector amplifies or counts the filtered fluorescence to form fluorescence energy spectrum data. The fluorescence energy spectrum data is transmitted to the control module 1 through the controller to complete the qualitative and quantitative detection of soil pollutants.

[0051] In a specific embodiment of the present invention, the third detection module 5 is located above the first detection module 6 and the second detection module, and the third detection module 5 is separated from the first detection module 6 and the second detection module by a partition 9.

[0052] Since the third detection module 5 is located above the first detection module 6 and the second detection module, the soil sample depth of the first detection module 6 and the second detection module is higher than that of the third detection module 5. During the process of calculating and determining the need for soil pollutant detection based on the detection results of the first detection module 6 and the second detection module, the third detection module 5 moves downward, so that the soil sample depth of the third detection module 5 during soil pollutant detection is closer to the soil sample depth of the first detection module 6 and the second detection module, ensuring that the soil samples of the third detection module 5 are consistent with those of the first detection module 6 and the second detection module, and improving the detection accuracy.

[0053] In a specific embodiment of the present invention, the detection device further includes a host computer connected to the control module 1, and the host computer is used to display the detection results. The host computer includes a host 8 and a display screen 7, and the detection results of the soil pH value, temperature, and pollutant concentration at different depths can be displayed through the display screen 7.

[0054] Embodiment 2

[0055] The in-situ soil pollution detection method applied to the in-situ soil pollution detection device in Embodiment 1 provided by the embodiments of the present invention includes the following steps:

[0056] Step 1: Control the drill pipe body of the drill pipe mechanism to drill downward in the soil.

[0057] The control module controls the driving motor of the drill pipe mechanism to work, and the driving motor drives the drill pipe body to move downward, so that the drill pipe body gradually drills into the soil, and at the same time, the first detection module, the second detection module, and the third detection module are sent into the soil.

[0058] Step 2: During the drilling process, obtain the real-time pH value and real-time temperature of the soil.

[0059] During the drilling process, the first detection module, the second detection module, and the third detection module are at different soil depths. According to the set sampling interval, the first detection module and the second detection module respectively obtain the real-time pH value and real-time temperature of the soil, and thus the real-time pH value and real-time temperature at different soil depths can be obtained during the drilling process.

[0060] Step 3: Calculate the detection interval according to the real-time pH value and real-time temperature.

[0061] There is a certain correlation between the soil pH value and the heavy metal pollutants contained in the soil. When the pH value is neutral or low, the heavy metal concentration will also change accordingly, that is, the soil may be contaminated with heavy metals and heavy metal concentration detection is required. Therefore, the detection interval can be calculated according to the real-time pH value and real-time temperature, and then it can be judged whether soil pollutant detection is needed according to the detection interval. In a specific embodiment of the present invention, the PID algorithm is used to calculate the detection interval, and its specific calculation formula is:

[0062]

[0063] where, ΔT represents the detection interval; K p represents the proportionality coefficient; e k represents the pH error rate at the kth sampling moment; K I represents the integral time constant; e(t) represents the pH error rate at time t, represents the area enclosed by the pH error rate curve from the 0th sampling moment to the kth sampling moment, represents the change rate of the pH error rate; K d represents the differential time constant; t represents time; T k represents the real-time temperature at the k-th sampling moment, pH k represents the real-time pH at the k-th sampling moment, pH nor represents the one corresponding to pH k normal soil pH

[0064] The normal soil pH is a set value. According to formula (3), the pH error rate corresponding to each real-time pH can be calculated, and thus the curve of the pH error rate changing with time, i.e., the pH error rate curve, can be obtained.

[0065] Step 4: Control the third detection module to detect soil pollutants according to the detection interval ΔT.

[0066] In the specific implementation manner of the present invention, controlling the third detection module to detect soil pollutants according to the detection interval includes:

[0067] If the detection interval ΔT is greater than or equal to 1, control the third detection module to detect soil pollutants;

[0068] If the detection interval ΔT is less than 1, do not detect soil pollutants.

[0069] The above-disclosed is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or modifications, which should all be covered within the protection scope of the present invention.

Claims

1. A soil pollution in-situ detection device, characterized in that: The detection device includes a control module, a drill rod mechanism, a first detection module, a second detection module and a third detection module, wherein the control module is connected to the drill rod mechanism, the first detection module, the second detection module and the third detection module, and the first detection module, the second detection module and the third detection module are respectively arranged at the bottom of the drill rod body of the drill rod mechanism; The control module is used to control the drill rod body of the drill rod mechanism to drill in the soil; calculate the detection interval according to the received real-time pH and real-time temperature, and control the third detection module to perform soil pollutant detection according to the detection interval, and receive the soil pollutant detection result fed back by the third detection module; The first detection module is used to detect the real-time pH value of the soil during the drilling process, and feed back the real-time pH value to the control module; The second detection module is used to detect the real-time temperature of the soil during the drilling process and feed the real-time temperature back to the control module; The third detection module is used to detect soil pollutants under the control of the control module and feed back the soil pollutant detection results to the control module.

2. The soil pollution in-situ detection device according to claim 1, characterized in that: The drill rod mechanism includes a drive motor, a gear box, a main shaft and a drill rod body. The drive motor is connected to the control module and is used to drive the gear box. The output end of the gear box is fixedly connected to the main shaft, and the bottom of the main shaft is provided with a drill rod body. The drive motor and the gear box are fixedly arranged on a support.

3. The soil pollution in-situ detection device according to claim 1, characterized in that: The first detection module includes a pH sensor, the pH sensor is arranged in the drill rod body and its probe contacts the soil during the drilling process; The second detection module comprises a temperature sensor, which is arranged in the drill rod body and a probe of the temperature sensor contacts the soil during the drilling process.

4. The soil pollution in-situ detection device according to claim 1, characterized in that: The third detection module comprises an XRF spectrometer, which is arranged in the drill pipe body and a transparent detection window is arranged on the outer wall of the drill pipe body corresponding to the XRF spectrometer.

5. The soil pollution in-situ detection device according to claim 1, characterized in that: The third detection module is located above the first detection module and the second detection module.

6. The soil pollution in-situ detection device according to claim 1, characterized in that: The control module is a PLC controller.

7. The soil contamination in-situ detection device according to any one of claims 1 to 6, characterized in that: The detection device also includes a host computer connected to the control module, and the host computer is used to display the detection result.

8. A soil contamination in-situ detection method, characterized in that: Applied to the soil contamination in-situ detection device according to any one of claims 1 to 7, the detection method comprises: Controlling the drill rod body of the drill rod mechanism to drill down into the soil; During the drilling process, obtain the real-time pH and temperature of the soil; Calculating a detection interval according to the real-time pH and real-time temperature; The third detection module is controlled to perform soil pollutant detection according to the detection interval.

9. The soil contamination in-situ detection method according to claim 8, characterized in that: The detection interval is calculated using the PID algorithm, and the specific calculation formula of the detection interval is: Where ΔT represents the detection interval; K p Represents the proportionality coefficient; e k K represents the pH error rate at the kth sampling moment; I represents the integral time constant; e(t) represents the pH error rate at time t, It represents the area enclosed by the pH error rate curve from the 0th sampling moment to the kth sampling moment. Indicates the rate of change of pH error rate; K d represents the differential time constant; t represents time; T k Indicates the real-time temperature at the kth sampling moment, pH k Indicates the real-time pH at the kth sampling moment, pH nor Indicated by pH k Corresponding normal soil pH.

10. The soil contamination in-situ detection method according to claim 8 or 9, characterized in that: Controlling the third detection module to perform soil pollutant detection according to the detection interval includes: If the detection interval is greater than or equal to 1, controlling the third detection module to perform soil pollutant detection; If the detection interval is less than 1, no soil pollutant detection is performed.

Images