A method for monitoring the position and extent of clogging in a constructed wetland

Abstract

This invention relates to a method for monitoring the location and degree of blockage in constructed wetlands. The steps are as follows: In the constructed wetland, multiple pipes with sidewall openings are pre-buried at predetermined intervals; test points are arranged at predetermined depths in each pipe; using a test point in one pipe as a reference test point, at the same depth, the initial resistance between the test points in the remaining pipes and the corresponding reference test point is measured; based on the distance between the test point and the corresponding reference test point and the initial resistance, the corresponding initial resistivity is obtained; at predetermined time intervals, based on the same depth, the current resistance between the test points in the remaining pipes and the corresponding reference test point is measured, and based on the distance between the test point and the corresponding reference test point and the current resistance, the corresponding current resistivity is obtained; by comparing the initial resistivity and the current resistivity, the location and degree of blockage in the constructed wetland are determined. This method can accurately determine the location and degree of blockage in a constructed wetland system.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a method for monitoring the location and extent of blockage in constructed wetlands. Background Technology

[0002] Substrate clogging is one of the main reasons affecting the water treatment efficiency of constructed wetlands and a key factor restricting their application and development. Studies have confirmed that the accumulation of impurities and biofilms in the wetland substrate leads to a decrease in porosity, and the resulting increased clogging makes the wetland more prone to an anaerobic state, which in turn further increases the degree of clogging. Generally, the physical, chemical, and biological processes that lead to wetland substrate clogging occur simultaneously and influence each other. For example, the accumulation of organic matter or particulate matter clogs the substrate pores, reducing the hydraulic conductivity and thus decreasing the oxygen supply capacity within the wetland, reducing the activity of microorganisms. Low microbial activity slows down the degradation rate of organic matter, which in turn exacerbates the accumulation of organic matter and accelerates the clogging process. Temperature is also an important factor affecting the operational efficiency of constructed wetlands. Low or excessively high temperatures can affect the growth activity of plants and microorganisms. Most plants lose activity or even die under extreme temperature conditions. Reduced plant activity also reduces their decontamination efficiency. If the remains of dead plants are not cleaned up in time, they will also cause blockage. Microorganisms also lose activity and metabolic rate under extreme temperatures, which will prevent pollutants from being removed in time. This will cause them to accumulate in the substrate and exacerbate the anaerobic environment, ultimately worsening the blockage.

[0003] Therefore, timely monitoring of the degree of blockage in wetland systems is crucial for implementing preventative measures, ensuring wetland water treatment efficiency, stabilizing and reducing energy consumption, and maintaining the ecological health of downstream water bodies. Currently, commonly used wetland system blockage detection technologies include the permeability coefficient method, the tracer method, and the numerical model method. While these methods can effectively determine the degree of blockage, for large wetland systems, the hydraulic conditions vary at different locations, leading to varying degrees of blockage at different depths in different areas. Indiscriminately determining whether the entire wetland is blocked is detrimental to the subsequent development and implementation of preventative measures, and increases the difficulty and workload of prevention and control. Therefore, developing convenient, rapid, effective, and targeted detection technologies is essential for tracking and monitoring the dynamic blockage status of wetland systems and accurately determining the location of blockages. Summary of the Invention

[0004] The purpose of this invention is to provide a method for monitoring the location and degree of blockage in constructed wetlands, so as to accurately determine the location and degree of blockage in constructed wetland systems.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for monitoring the location and extent of blockage in constructed wetlands includes the following steps:

[0007] In constructed wetlands, multiple pipes with sidewall openings are pre-buried at predetermined intervals, with adjacent pipes running parallel to each other;

[0008] Test points are arranged at preset depths in each pipe. Taking the test point in one pipe as the reference test point, the initial resistance between the test points in the other pipes and the corresponding reference test point is tested based on the same depth. The corresponding initial resistivity is obtained according to the distance between the test point and the corresponding reference test point and the initial resistance.

[0009] At preset time intervals, based on the same depth, test the current resistance between the test point and the corresponding reference test point in the remaining pipe, and obtain the corresponding current resistivity based on the distance between the test point and the corresponding reference test point and the current resistance;

[0010] By comparing the initial resistivity with the current resistivity, the location and degree of blockage in the constructed wetland can be determined.

[0011] Preferably, the preset distance is the distance between adjacent pipes, and the preset distance is between 5cm and 9cm.

[0012] Preferably, the arrangement of test points at preset depths in each pipe is done along the length of each pipe at preset depths, with the preset depths being between 3cm and 7cm.

[0013] Preferably, the preset time is at least 60 days.

[0014] Preferably, the constructed wetland is in a saturated flow state when testing the initial or current resistance.

[0015] Preferably, the initial resistivity is calculated using Formula I:

[0016]

[0017] In Equation I, ρ 初 R represents the initial resistivity between the test point and the corresponding reference test point, in Ω / m. 初 The initial resistance between the test point and the corresponding reference test point is expressed in Ω; L represents the distance between the test point and the corresponding reference test point, expressed in meters.

[0018] Preferably, the current resistivity is calculated using Formula II:

[0019]

[0020] In formula II, ρ 当 R represents the current resistivity between the test point and the corresponding reference test point, in Ω / m. 当The current resistance between the test point and the corresponding reference test point is expressed in Ω; L represents the distance between the test point and the corresponding reference test point, expressed in meters.

[0021] Preferably, the location and degree of blockage in the constructed wetland are determined by comparing the initial resistivity with the current resistivity, specifically including:

[0022] The initial and current resistivity were converted into a color-filled map using Origin software. The location of blockage in the constructed wetland was determined by the color distribution, and the degree of blockage was determined by the color depth.

[0023] Preferably, the pipes are arranged in the artificial wetland in a direction perpendicular to the horizontal plane.

[0024] Preferably, the initial resistance and the current resistance are obtained by measuring with a multimeter.

[0025] The beneficial effects of this invention are:

[0026] The present invention discloses a method for monitoring the location and degree of blockage in constructed wetlands. First, the constructed wetland is divided laterally into several equidistant sections by inserting (or pre-burying) vertical pipes with sidewall openings into the wetland. One of these pipes is used as a reference pipe. The positive electrode of a multimeter is fixed in the reference pipe, while the negative electrode is moved sequentially through the other pipes to test the resistance between the reference pipe and the other pipes at different depths. The resistivity is calculated based on the distance between the positive and negative electrodes. The test results represent the resistivity values ​​at different distances and depths within the wetland system. Then, the obtained resistivity values ​​at different distances and depths are imported into Origin software and converted into a visual color-filled graph, allowing for direct observation of the location and degree of blockage in the constructed wetland system. This monitoring method can conveniently, quickly, and accurately pinpoint the location and degree of blockage in constructed wetland systems, enabling dynamic detection of blockage levels, timely identification of blockage problems, and implementation of preventative measures. This ensures the stable and long-term operation of the constructed wetland system and has significant application value in the field of wastewater treatment technology. Attached Figure Description

[0027] Figure 1 A schematic diagram of the structure for testing the electrical resistance of constructed wetlands;

[0028] Figure 2 The result of importing the initial resistivity into Origin software;

[0029] Figure 3 The result of importing the current resistivity into Origin software;

[0030] Figure 4 A schematic diagram of the structure for converting the initial resistivity into a color-filled map;

[0031] Figure 5 Resistivity distribution of an artificial wetland system after 60 days of operation;

[0032] Figure 6 Resistivity distribution map of the constructed wetland system after 370 days of operation;

[0033] Among them, 1-artificial wetland; 2-pipeline; 3-multimeter; 31-positive electrode; 32-negative electrode. Detailed Implementation

[0034] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0035] Example

[0036] like Figure 1 As shown, a method for monitoring the location and extent of blockage in constructed wetlands includes the following steps:

[0037] S1. In the constructed wetland 1, pipes 2 with sidewall openings are pre-embedded at preset intervals in a direction perpendicular to the horizontal plane. Adjacent pipes 2 are parallel to each other. In this embodiment, the substrate of the constructed wetland 1 includes A: gravel and B: fine sand. The constructed wetland 1 includes pipes with preset intervals between 5cm and 9cm. The pipes 2 can be glass pipes or plastic pipes, etc.

[0038] S2. Arrange test points at preset depths in each pipe. Using a test point in one pipe as a reference test point, measure the initial resistance between the test points in the remaining pipes and the corresponding reference test point at the same depth. Obtain the corresponding initial resistivity based on the distance between the test point and the corresponding reference test point and the initial resistance. Specifically, this includes:

[0039] S21. In the constructed wetland 1, a test point is arranged at a predetermined depth at each interval along the length of each pipe 2, with the test point in one of the pipes serving as the reference test point, such as... Figure 1As shown, in this embodiment, a test point is arranged every 5cm along the length of the pipe. That is, in each pipe 2, a test point is arranged sequentially from bottom to top along the length of the pipe at depths of 50cm, 45cm, 40cm, 35cm, 30cm, 25cm, 20cm, 15cm, 10cm, and 5cm. The pipes include pipes A1, A2, A3, A4, and A5. Figure 1 The test point in pipe A1 is the baseline test point;

[0040] S22. During the measurement process, first adjust the multimeter 3 to the ohm measurement mode. Then, under the premise that the artificial wetland 1 is in a saturated flow state and at the same depth, fix the positive electrode 31 of the multimeter at the reference test point in pipe A1. Move the negative electrode 32 one by one in pipes A2, A3, A4 and A5 to the test point at the corresponding depth. Measure the initial resistance between the test point in the other pipes and the corresponding reference test point using the multimeter.

[0041] S23. Based on the distance between the test point and the corresponding reference test point and the initial resistance, calculate the initial resistivity between the test point and the corresponding reference test point using Formula I:

[0042]

[0043] In Equation I, ρ 初 R represents the initial resistivity, in units of Ω / m. 初 The initial resistance is represented in Ω; L represents the preset distance.

[0044] S24. Import the calculated initial resistivity into Origin software. In this embodiment, the results of importing the initial resistivity calculated at the same depth into Origin software are as follows: Figure 2 As shown;

[0045] S3. At preset time intervals, based on the same depth, test the current resistance between the test point and the corresponding reference test point in the remaining pipes, and obtain the corresponding current resistivity based on the distance between the test point and the corresponding reference test point and the current resistance. Specifically, this includes:

[0046] S31. At a preset time interval, that is, the artificial wetland is operated for a preset time. Then, under the premise that the artificial wetland 1 is in a saturated flow state and at the same depth, the positive electrode of the multimeter is fixed at the reference test point in pipe A1, and the negative electrode is moved one by one in pipes A2, A3, A4 and A5 to the test point at the corresponding depth. The current resistance between the test point in the other pipes and the corresponding reference test point is obtained by measuring with the multimeter. In this embodiment, the preset time is at least 60 days.

[0047] S32. Based on the distance between the test point and the corresponding reference test point and the current resistance, calculate the current resistivity between the test point and the corresponding reference test point using Formula II:

[0048]

[0049] In formula II, ρ 当 R represents the current resistivity between the test point and the corresponding reference test point, in Ω / m. 当 The current resistance between the test point and the corresponding reference test point is expressed in Ω; L represents the distance between the test point and the corresponding reference test point, expressed in meters.

[0050] S33. Import the calculated current resistivity into Origin software. In this embodiment, the result of importing the current resistivity calculated at the same depth into Origin software is as follows: Figure 3 As shown;

[0051] S4. Compare the initial resistivity with the current resistivity to determine the location and degree of blockage in the constructed wetland, specifically including:

[0052] In Origin software, the distance between the test point and the corresponding baseline test point is used as the X-axis value, the pipe depth as the Y-axis value, and the initial resistivity or current resistivity as the Z-axis value. Figure 4 As shown, select the hash data in the Origin software and click... And select from the drop-down options The following The option allows you to convert the initial and current resistivity into a visually appealing color-filled plot. In this embodiment, the resistivity distribution map of the constructed wetland system after 60 days of operation is shown below. Figure 5 As shown, where, Figure 5 A represents an artificial wetland system composed of a gravel matrix. Figure 5 B represents an artificial wetland system composed of fine sand substrate; the resistivity distribution diagram of the artificial wetland system after 370 days of operation is shown below. Figure 6 As shown, where, Figure 6 A represents an artificial wetland system composed of a gravel matrix. Figure 6 B represents an artificial wetland system composed of fine sand substrate. Figure 5 and Figure 6 The liquid level in the pipe indicates its depth. Figure 5 and Figure 6 The location of blockages in constructed wetlands can be determined by color distribution, and the degree of blockage can be determined by color depth. (Comparison) Figure 5 A and Figure 6 A, and Figure 5As can be seen from Figures B and 6B, the blockage is mainly concentrated in the lower part of the reactor, and the blockage trend extends from bottom to top.

[0053] In summary, the method for monitoring the location and degree of blockage in constructed wetlands according to the present invention firstly divides the constructed wetland into several equidistant sections by inserting (pre-embedded) vertical pipes with sidewall openings into the wetland. Using one of these pipes as a reference pipe, the positive electrode of a multimeter is fixed in the reference pipe, while the negative electrode is moved sequentially through the other pipes to test the resistance between the reference pipe and the other pipes at different depths. The resistivity is calculated based on the distance between the positive and negative electrodes, and the test results represent the resistivity values ​​at different distances and depths within the wetland system. Then, the obtained resistivity values ​​at different distances and depths are imported into Origin software and converted into a visual color-filled graph, allowing for direct observation of the location and degree of blockage in the constructed wetland system. This monitoring method of the present invention can conveniently, quickly, and accurately target and locate the location and degree of blockage in constructed wetland systems, enabling dynamic detection of blockage levels, timely identification of blockage problems, and implementation of preventative measures to ensure the stable and long-term operation of the constructed wetland system. It has significant application value in the field of wastewater treatment technology.

[0054] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A method for monitoring the location and degree of blockage in constructed wetlands, characterized in that, Includes the following steps: In constructed wetlands, multiple pipes with sidewall openings are pre-buried at predetermined intervals, with adjacent pipes running parallel to each other; Test points are arranged at preset depths in each pipe. Taking the test point in one pipe as the reference test point, the initial resistance between the test points in the other pipes and the corresponding reference test point is tested based on the same depth. The corresponding initial resistivity is obtained according to the distance between the test point and the corresponding reference test point and the initial resistance. At preset time intervals, based on the same depth, test the current resistance between the test point and the corresponding reference test point in the remaining pipe, and obtain the corresponding current resistivity based on the distance between the test point and the corresponding reference test point and the current resistance; By comparing the initial resistivity with the current resistivity, the location and degree of blockage in the constructed wetland can be determined. Specifically, the initial resistivity and current resistivity are converted into a color-filled map using Origin software. The location of blockage in the constructed wetland is determined by the color distribution, and the degree of blockage is determined by the color depth. When testing the initial or current resistance, the constructed wetland is in a saturated flow state.

2. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The preset distance is the distance between adjacent pipes, and the preset distance is between 5cm and 9cm.

3. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The arrangement of test points at preset depths in each pipe means arranging test points at preset depths along the length of each pipe, with the preset depths being between 3cm and 7cm.

4. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The preset time is at least 60 days.

5. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The initial resistivity is obtained by calculation using Formula I: (Ⅰ) In Equation I, ρinitial represents the initial resistivity between the test point and the corresponding reference test point, in Ω / m; Rinitial represents the initial resistance between the test point and the corresponding reference test point, in Ω; and L represents the distance between the test point and the corresponding reference test point, in m.

6. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The current resistivity is calculated using Formula II: (Ⅱ) In Equation II, ρ represents the current resistivity between the test point and the corresponding reference test point, in Ω / m; R represents the current resistance between the test point and the corresponding reference test point, in Ω; and L represents the distance between the test point and the corresponding reference test point, in m.

7. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The pipeline is arranged in the artificial wetland in a direction perpendicular to the horizontal plane.

8. The method for monitoring the location and degree of blockage in constructed wetlands according to claim 1, characterized in that, The initial resistance and current resistance are obtained by measuring with a multimeter.

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