In-situ remediation device and method for controlling nitrogen and phosphorus release of urban lake sediment by using adsorption material

Abstract

The invention discloses an in-situ remediation device and method for controlling nitrogen and phosphorus release of urban lake sediment by using an adsorption material, and belongs to the technical field of sediment nitrogen and phosphorus release remediation. The quantitative feeding part comprises a box body and a storage cavity which is formed in the box body and used for storing adsorption material particles, and a plurality of discharging ends are arranged at the bottom of the box body; and each discharging covering part comprises a material guiding pipe communicating with the discharging end, a discharging pipe fitting movably arranged on the outer side of the material guiding pipe in a sleeving mode, a bottom frame arranged at the end, away from the material guiding pipe, of the discharging pipe fitting and a detection sensor arranged on the bottom frame, and the discharging pipe fitting is connected with the box body through first telescopic equipment. Through the synergistic effect of the mounting part, the quantitative feeding part and the discharging covering part, the height of the discharging pipe fitting is dynamically adjusted according to distance data fed back by a detection sensor, and it is ensured that adsorption material particles accurately reach and are stably attached to the surface of target bottom mud without disturbing the bottom mud.

Description

Technical Field

[0001] This invention relates to the field of nitrogen and phosphorus release remediation in sediments, specifically to an in-situ remediation device and method for controlling nitrogen and phosphorus release from urban lake sediments using adsorption materials. Background Technology

[0002] Currently, elevated nitrogen and phosphorus levels in urban lakes easily lead to eutrophication problems such as algal blooms. Treatment methods mainly include in-situ and ex-situ remediation. In-situ remediation technology is widely used due to its advantages of not requiring dredging, lower cost, and minimal ecological disturbance. Common methods include aeration reoxygenation, microbial remediation, and physicochemical adsorption. Most current in-situ remediation devices control nitrogen and phosphorus pollution by introducing adsorbent materials into the sediment to fix active phosphorus and inhibit endogenous release. However, these devices still have the following drawbacks: Most in-situ remediation devices release adsorbent material particles into the water by deploying equipment. However, the adsorbent material particles drift laterally during the sinking process due to the influence of water flow, making it impossible to accurately reach the preset bottom sediment location, resulting in material waste and inaccurate pollution remediation. To address this, we propose an in-situ remediation device and method that utilizes adsorbent materials to control the release of nitrogen and phosphorus from urban lake bottom sediments. Summary of the Invention

[0003] The purpose of this invention is to provide an in-situ remediation device and method for controlling nitrogen and phosphorus release from urban lake sediments using adsorbent materials. This invention solves the technical problem that most existing in-situ remediation devices release adsorbent material particles into the water through an injection device. However, the adsorbent material particles are affected by water flow during the sinking process and drift laterally, failing to accurately reach the preset sediment location, resulting in material waste and inaccurate pollution remediation.

[0004] The present invention achieves the above objectives through the following technical solutions: An in-situ remediation device for controlling nitrogen and phosphorus release from urban lake sediments using adsorption materials comprises several main components, each including: Mounting section, used for mounting on surface mobile equipment; A quantitative feeding unit includes a box body, a storage chamber for storing adsorbent material particles inside the box body, and a number of discharge ends for discharging adsorbent material particles at the bottom of the box body. Several discharge covers are provided, each of which is connected to a discharge end. Each discharge cover includes a guide pipe connected to the discharge end, a discharge pipe fitting movably sleeved on the outside of the guide pipe, a base frame located at the end of the discharge pipe fitting away from the guide pipe, and a detection sensor located on the base frame for detecting the distance data between the discharge pipe fitting and the lake bottom sediment. The discharge pipe fitting is connected to the housing via a first telescopic device, which adjusts the height of the discharge pipe fitting based on the distance data fed back by the detection sensor.

[0005] A further improvement is that the mounting section includes a mounting bracket for connecting to a surface mobile device, and an electric slide rail device for connecting the mounting bracket and the housing.

[0006] A further improvement is that the quantitative feeding unit also includes a receiving cavity opened in the box body and located below the storage cavity, a rotating roller rotatably disposed in the receiving cavity, and a rotating device disposed on the side wall of the box body for driving the rotating roller to rotate. The storage cavity and the receiving cavity are connected through several discharge ports, the receiving cavity is connected to each discharge end, and the discharge port corresponds to the discharge end one by one. The outer circumference of the rotating roller is provided with several receiving grooves in a ring array for cooperating with the discharge port and the discharge end. The receiving grooves are used to contain adsorbent material particles.

[0007] A further improvement is that a sealing seat is provided on one side of the base frame, and a matching piston is movably provided at one end of the sealing seat. The piston is connected to the inner wall of one side of the sealing seat through an elastic element. A movable block is connected to the side of the piston away from the elastic element. The movable block passes through one side of the sealing seat and is connected to a contact block. An inclined protrusion is integrally provided on the side of the contact block away from the movable block. Several sets of ball bearings are embedded at the bottom of the inclined protrusion. A groove for installing a detection sensor is opened at the bottom of the contact block.

[0008] A further improvement is that the discharge pipe includes a discharge pipe one movably sleeved on the outside of the guide pipe, a discharge pipe two spaced below the discharge pipe one and coaxial with the discharge pipe one, two sets of corrugated pipes arranged sequentially from the inside to the outside between the discharge pipe one and the discharge pipe two, and an elastic connecting rod arranged in the two sets of corrugated pipes connecting the discharge pipe one and the discharge pipe two. The outer wall of the discharge pipe one is also provided with a self-lifting part for driving the discharge pipe two to move relative to the discharge pipe one.

[0009] A further improvement is that the self-lifting part includes a sleeve fixedly fitted on the outer wall of the discharge pipe, an annular cavity opened in the sleeve, and a piston ring movably disposed in the annular cavity. The sleeve is connected to a sealing seat through a pipeline. The sealing seat and the side of the piston ring and the pipeline are both filled with driving medium. Several pull ropes are connected to one side of the piston ring, and one end of the pull ropes extends into two sets of corrugated pipes and is connected to the discharge pipe. When the movable block drives the piston to move towards the side of the discharge pipe in the sealing seat, the driving medium is pressurized and transmitted to the annular cavity through the pipeline, pushing the piston ring to move upward in the annular cavity. Then, the piston ring pulls the discharge pipe upward through the pull ropes.

[0010] A further improvement is that the sealing seat is provided with a one-way inlet pipe and a one-way outlet pipe. The one-way inlet pipe is provided with a filter screen. The other end of the one-way outlet pipe extends into the groove and corresponds to the sensing end of the detection sensor. When the piston is driven by the movable block to move towards the outlet pipe in the sealing seat, the one-way inlet pipe draws water from the water area into the sealing seat. When the piston moves in the opposite direction to reset, the one-way outlet pipe discharges the water in the sealing seat into the groove and flows to the detection sensor to clean it. A cleaning component is attached to the bottom of the movable block. One end of the cleaning component is connected to the sealing seat, and the other end moves through the side wall of the contact block. The cleaning component is used to clean the sensing end of the detection sensor when the movable block drives the piston to move towards the discharge pipe side inside the sealing seat.

[0011] A further improvement is that the base frame has an opening that communicates with the discharge pipe, and a sealing plate is movably installed in the opening. The sealing plate is connected to a second telescopic device embedded in the base frame. The second telescopic device is used to drive the sealing plate to move to open or close the opening.

[0012] A further improvement is that the adsorbent material particles stored in the main body of each of the several devices are different, and the adsorbent material particles include: calcium-based adsorbent particles, ferric chloride particles and salt-activated zeolite particles. The calcium-based adsorbent particles are formed by granulation of calcium hydroxide, red soil, and bentonite in a certain proportion.

[0013] An in-situ remediation method for controlling nitrogen and phosphorus release from urban lake sediments using adsorption materials, utilizing the aforementioned in-situ remediation device, includes the following steps: S1: Install it on the water surface mobile equipment through the mounting part of the main body of the device; S2: The mobile device moves through the urban lake. During this process, the detection sensor continuously monitors the distance between the bottom of the discharge pipe and the surface of the lake bottom mud. The first telescopic device adjusts the height of the discharge pipe in real time based on the distance data fed back by the sensor, so that the bottom of the pipe always maintains the preset working height with the bottom mud. S3: The adsorbent material particles stored in the storage chamber are fed into the feed pipe through the discharge end at the bottom of the box, and then the adsorbent material particles are discharged from the feed pipe and discharge pipe to cover the surface of the lake bottom mud.

[0014] The beneficial effects of this invention are as follows: This invention achieves quantitative control and uniform coverage of adsorbent material particles in an underwater environment through the synergistic action of the installation unit, the quantitative feeding unit, and the discharge covering unit. Furthermore, it dynamically adjusts the height of the discharge pipe based on the spacing data fed back by the detection sensor, ensuring that the adsorbent material particles accurately reach and stably adhere to the target sediment surface without disturbing the sediment. This achieves efficient remediation while reducing particle drift caused by water flow, improving the control precision and remediation quality of nitrogen and phosphorus pollution, and also reducing material waste and the risk of secondary pollution. Secondly, the discharge cover of this invention has excellent anti-collision and obstacle avoidance capabilities. When encountering underwater obstacles, it not only provides elastic buffering to effectively absorb impact energy, but also retracts the discharge pipe to avoid continuous collisions, thus preventing structural damage, sensor damage, or pipe blockage. This improves the stability of the device in underwater environments. At the same time, it also removes silt, microbial film, or impurities adhering to the surface of the sensor's sensing end during collisions, effectively preventing measurement signal distortion, data errors, or performance degradation caused by sensor contamination, and ensuring long-term stable operation of the sensor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the in-situ repair device of the present invention; Figure 2 For the present invention Figure 1 Structural side view; Figure 3 For the present invention Figure 1 Partial structural sectional view; Figure 4 This is a schematic diagram of the discharge cover structure of the present invention; Figure 5 For the present invention Figure 5 Partial structural sectional view; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of structure A in the image; Figure 7 For the present invention Figure 5 An enlarged schematic diagram of the B structure in the image.

[0016] In the diagram: 100, Installation section; 101, Mounting frame; 102, Electric slide rail device; 200, Quantitative feeding section; 201, Box body; 202, Storage chamber; 203, Rotating roller; 204, Receiving trough; 205, Discharge port; 206, Rotating device; 300, Discharge cover section; 301, Guide pipe; 302, Discharge pipe one; 303, Discharge pipe two; 304, Corrugated pipe; 305, Base frame; 306 307. Sealing plate; 308. First telescopic device; 309. Sealing seat; 310. Moving block; 311. Contact block; 312. Inclined protrusion; 313. Ball bearing; 314. Sleeve; 315. Elastic element; 316. Pull rope; 317. Detection sensor; 318. Cleaning component; 319. One-way liquid outlet pipe; 320. One-way liquid inlet pipe; 321. Piston ring; 322. Piston component; 323. Second telescopic device. Detailed Implementation

[0017] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0018] Example 1 Please see the appendix Figure 1-3 An in-situ remediation device for controlling nitrogen and phosphorus release from urban lake sediments using adsorption materials comprises several main components, each including: The mounting unit 100 is used to be installed on the water surface mobile device. Optionally, the water surface mobile device in this embodiment can be an unmanned boat or other water surface mobile device. The water surface mobile device and the electrical components in the main body of the device can be connected to an external control terminal through a wireless communication device so that the operator can remotely control the nitrogen and phosphorus release and remediation work of urban lake bottom sediment. The quantitative feeding unit 200 includes a box 201 and a storage cavity 202 opened inside the box 201 for storing adsorbent material particles. The bottom of the box 201 has several discharge ends for discharging adsorbent material particles. Furthermore, the top of the box 201 also has a feed port communicating with the storage cavity 202 to replenish the adsorbent material particles into the storage cavity 202. Several discharge ends are equidistantly distributed along the length of the box 201 at the bottom of the box 201 so that the adsorbent material particles are discharged and cover the surface of the urban lake bottom sediment. Several discharge covers 300, each discharge cover 300 is connected to a discharge end, that is, the number of discharge covers 300 and discharge ends are the same. After the adsorbent material particles are discharged through the discharge end, they enter the corresponding discharge cover 300 and are discharged from the corresponding discharge cover 300. In this embodiment, the discharge cover 300 includes a guide pipe 301 communicating with the discharge end, a discharge pipe fitting movably sleeved on the outside of the guide pipe 301, a base frame 305 (L-shaped vertical section) located at the end of the discharge pipe fitting away from the guide pipe 301, and a detection sensor 316 located on the base frame 305 for detecting the distance between the discharge pipe and the lake bottom sediment (or lake bottom surface). Optionally, the detection sensor 316 in this embodiment is an ultrasonic ranging sensor, but it is not limited to this type. The discharge pipe fitting is connected to the housing 201 via a first telescopic device 307 (such as an electric telescopic rod). The first telescopic device 307 adjusts the height of the discharge pipe fitting in real time based on the distance data fed back by the detection sensor 316. Specifically, the first telescopic device 307 and the detection sensor... All sensors 316 are connected to an external control terminal. The sensors 316 provide real-time feedback of spacing data to the external control terminal. The external control terminal then precisely adjusts the first telescopic device 307 to move the discharge pipe relative to the guide pipe 301 to maintain the preset working height between its bottom and the bottom mud. This method not only avoids uneven coverage of adsorbent material particles caused by hull movement or uneven bottom mud, but also avoids the adsorbent material particles drifting laterally due to water flow during descent, thus preventing them from accurately reaching the preset bottom mud position. This significantly improves the positioning accuracy and distribution uniformity of the adsorbent material particles, effectively enhances the in-situ remediation effect of the adsorbent material particles on nitrogen and phosphorus release from the bottom mud, reduces material waste, and avoids secondary disturbance to the bottom mud.

[0019] Preferably, the mounting section 100 in this embodiment includes a mounting bracket 101 for connecting to a surface mobile device, and an electric slide rail device 102 for connecting the mounting bracket 101 and the housing 201. Optionally, the mounting bracket 101 can be connected to the surface equipment using bolted components for easy assembly and disassembly; The aforementioned electric slide rail device 102 is a conventional device in this field, including a slider, a slide rail, and a drive system. The slider is connected to the housing 201, and the slide rail is connected to the mounting bracket 101. These details will not be elaborated further here. The drive system controls the slider to move along the slide rail, thereby driving the entire housing 201 and the discharge cover 300 below it to rise and fall smoothly, allowing it to accurately enter the predetermined working depth in the lake water area. This achieves flexible and precise adjustment of the height of the housing 201 and the discharge cover 300, adapting to different water depths and operational requirements.

[0020] Please see the appendix Figure 3 Preferably, the quantitative feeding unit 200 of this embodiment also includes a receiving cavity (with a circular vertical cross section) opened in the box 201 and located below the storage cavity 202, a rotating roller 203 rotatably disposed in the receiving cavity, and a rotating device 206 (such as a motor, preferably an adjustable speed motor) disposed on the side wall of the box 201 for driving the rotating roller 203 to rotate. The storage chamber 202 and the receiving chamber are connected by several discharge ports 205. The receiving chamber is connected to each discharge end, and the discharge ports 205 correspond one-to-one with the discharge ends, meaning the number of discharge ports 205 and discharge ends is the same. The outer circumference of the rotating roller 203 has several receiving grooves 204 arranged in a ring array to cooperate with the discharge ports 205 and discharge ends. The receiving grooves 204 are used to hold adsorbent material particles. Specifically, each discharge port 205, discharge end, and receiving groove 204 holds only one adsorbent material particle. The rotation is adjusted... The rotation speed control of the rotating roller 203 in the equipment 206 allows the receiving tank 204 to sequentially receive individual adsorbent material particles from the discharge port 205 during rotation and transport them to the corresponding discharge end position for discharge. This ensures that the adsorbent material particles enter the discharge cover 300 in an orderly manner. This method achieves quantitative, controllable, and continuous conveying of adsorbent material particles, effectively preventing blockage and jamming, and improving the accuracy and consistency of feeding. At the same time, the rotation speed can be adjusted to flexibly adapt to the feeding needs under different repair conditions, enhancing the reliability and operating efficiency of the entire device.

[0021] Please see the appendix Figure 4-7 Preferably, in this embodiment, a sealing seat 308 is provided on one side of the base frame 305. A matching piston 321 is movably provided at one end of the sealing seat 308. Optionally, the piston 321 is a piston plate, and a sealing ring is embedded in its outer wall to abut against the inner wall of the sealing seat 308. The piston 321 is connected to the inner wall of one side of the sealing seat 308 through an elastic member 314 (such as a spring). Specifically, as shown in the attached figure... Figure 5 As shown, one end of the elastic element 314 is connected to the left side of the piston element 321, and the other end is connected to the inner wall of the right side of the sealing seat 308. A movable block 309 is connected to the side of the piston element 321 away from the elastic element 314. The movable block 309 passes through one side of the sealing seat 308 and is connected to a contact block 310. An inclined protrusion 311 is integrally provided on the side of the contact block 310 away from the movable block 309, as shown in the attached diagram. Figure 5 As shown, the end of the inclined protrusion 311 facing the contact block 310 is lower than the other end. Several sets of balls 312 are embedded in the bottom of the inclined protrusion 311 for contacting the colliding object. The bottom of the contact block 310 has a groove for installing the detection sensor 316. Preferably, the inclined protrusion 311 in this device faces the same direction as the movement of the surface mobile device. When the surface mobile device is moving, when the discharge cover 300 encounters an obstacle underwater, the inclined protrusion 311 contacts the obstacle first. With the help of the ball bearing 312, the contact block 310 and the movable block 309 move laterally, pushing the piston 321 to compress the elastic element 314, effectively buffering and avoiding collision impact. Then, under the action of the restoring force of the elastic element 314, it automatically resets. This method not only significantly improves the anti-collision capability of the detection sensor 316 and the discharge pipe in the underwater environment, but also ensures the continuous stable operation and measurement accuracy of this device through mechanical buffering and self-resetting functions.

[0022] Please see the appendix Figure 4-7 Preferably, the discharge pipe fitting in this embodiment includes a discharge pipe 302 movably sleeved on the outside of the guide pipe 301 (i.e., the inner diameter of the discharge pipe 302 is adapted to the outer diameter of the guide pipe 301), a discharge pipe 303 spaced below the discharge pipe 302 and coaxial with the discharge pipe 302, two sets of corrugated pipes 304 arranged sequentially from the inside to the outside between the discharge pipe 302 and the discharge pipe 303, and a connection between the discharge pipe 302 and the discharge pipe 303. 03. The elastic connecting rod is located within the two sets of corrugated pipes 304. The elastic connecting rod is like an elastic telescopic rod. The elastic connecting rod can play a role in assisting reset and limiting the direction of movement when the discharge pipe 2 303 moves relative to the discharge pipe 1 302. At the same time, the two sets of corrugated pipes 304 effectively protect the elastic connecting rod from water intrusion, siltation and mechanical damage. The outer wall of the discharge pipe 1 302 is also provided with a self-lifting part for driving the discharge pipe 2 303 to move relative to the discharge pipe 1 302.

[0023] Preferably, the base frame 305 of this embodiment has an opening that communicates with the discharge pipe 303. A sealing plate 306 is movably installed in the opening. The sealing plate 306 is connected to a second telescopic device 322 (such as an electric telescopic rod) embedded in the base frame 305. The second telescopic device 322 is used to drive the sealing plate 306 to move to open or close the opening. In this way, it is possible to effectively prevent impurities in the water from backflowing and clogging the pipeline, and avoid accidental leakage of adsorbent material particles when not in operation.

[0024] An in-situ remediation method for controlling nitrogen and phosphorus release from urban lake sediments using adsorbent materials, employing the in-situ remediation device described above, includes the following steps: S1: The device is installed on a surface mobile device via the mounting part 100 of the main body of the device; S2: The mobile device moves through the urban lake. During this process, the sensor 316 continuously monitors the distance between the bottom of the discharge pipe and the surface of the lake bottom mud. The first telescopic device 307 adjusts the height of the discharge pipe in real time based on the distance data fed back by the sensor, so that the bottom of the pipe always maintains the preset working height with the bottom mud. S3: The adsorbent material particles stored in the storage chamber 202 are fed into the guide pipe 301 through the discharge end at the bottom of the box 201, and then the adsorbent material particles are discharged from the guide pipe 301 and the discharge pipe to cover the surface of the lake bottom mud.

[0025] Example 2 Please see the appendix Figure 4-7Based on Embodiment 1, the self-lifting part of this embodiment includes a sleeve 313 fixedly sleeved on the outer wall of the discharge pipe 302, an annular cavity opened in the sleeve 313, and a piston ring 320 movably disposed in the annular cavity. The top of the sleeve 313 is provided with a vent to ensure that the piston ring 320 moves smoothly up and down in the cavity. The sleeve 313 is connected to the sealing seat 308 through a pipeline. The sealing seat 308 and the side of the piston ring 320 and the pipeline are filled with a driving medium, which includes compressed gas or hydraulic oil. A number of pull ropes 315 are connected to one side of the piston ring 320, and one end of the pull ropes 315 extends into the two sets of corrugated pipes 304 and is connected to the discharge pipe 303. When encountering an obstacle underwater, the tilting protrusion 311 first contacts the obstacle, and the ball bearing 312 guides the contact block 310 and the movable block 309 to move laterally. Then, the movable block 309 drives the piston 321 to move towards the discharge pipe 303 within the sealing seat 308. During the movement, the driving medium is pressurized and transmitted through the pipeline to the annular cavity, pushing the piston ring 320 to move upward within the annular cavity. Then, the piston ring 320 pulls the discharge pipe 303 upward through the pull rope 315. In this way, the discharge pipe 303 can be automatically and quickly retracted in the event of a collision to avoid continuous collisions, structural damage, damage to the detection sensor 316, or pipeline blockage. This improves the device's adaptive obstacle avoidance capability, operational reliability, and equipment durability in complex underwater environments. At the same time, lifting and buffering reset can be completed without external control intervention, ensuring the continuity and safety of repair operations.

[0026] Example 3 Please see the appendix Figure 4-7 Based on Embodiment 1, the self-lifting part in this embodiment can also be: the self-lifting part includes a sleeve 313 fixedly sleeved on the outer wall of the discharge pipe 302, an annular cavity opened in the sleeve 313, and a piston ring 320 movably disposed in the annular cavity. A magnetic block (not shown in the figure) is embedded in the inner wall of the top of the piston ring 320. An electromagnetic ring (not shown in the figure) that is energized to attract the magnetic block is embedded in the top wall of the sleeve 313. A sensor (not shown in the figure, such as a pressure sensor) for contacting the piston 321 is embedded in the inner wall of one side of the sealing seat 308. When the movable block 309 drives the piston 321 to move towards the discharge pipe 303 in the sealing seat 308, the sensor does not receive the pressure data of the piston 321, and then sends a signal to the external control terminal. The external control terminal controls the electromagnetic ring to be energized, and then the electromagnetic ring attracts the magnetic block, causing the piston ring 320 to move upward. As a result, the pull rope 315 pulls the discharge pipe 303 upward, so that the contact block 310 and the inclined protrusion 311 are disengaged from the obstacle.

[0027] This device offers two types of self-lifting sections, which can be selected according to needs, and will not be described in detail here.

[0028] Example 4 Please see the appendix Figure 4-7 Based on Embodiment 2 or Embodiment 3, as a preferred embodiment, the sealing seat 308 is provided with a one-way inlet pipe 319 and a one-way outlet pipe 318. Both the one-way inlet pipe 319 and the one-way outlet pipe 318 are pipes with one-way valves. The one-way inlet pipe 319 is provided with a filter screen for filtering the inhaled water. The other end of the one-way outlet pipe 318 extends into the groove and corresponds to the sensing end of the detection sensor 316. When the piston 321 driven by the movable block 309 moves towards the discharge pipe 303 side within the sealing seat 308, a negative pressure is formed on one side of the inner cavity of the sealing seat 308, thereby drawing water from the lake. When the piston 321 is pushed into the sealing seat 308 and moves back to its original position under the action of the elastic member 314, the one-way outlet pipe 318 discharges the water in the sealing seat 308 into the groove and flows to the detection sensor 316 to clean it. Although the detection sensor 316 is always in the lake, the pressure water flow generated by the mechanical movement still plays a certain role in removing the silt, biofilm and impurities attached to the sensing end, which significantly prevents the measurement signal from attenuating and the data from being distorted. It can be seen that the above setting method not only provides effective impact buffering and adaptive lifting obstacle avoidance function when encountering obstacles, but also realizes the self-cleaning of the detection sensor 316 by its own movement. The bottom of the movable block 309 is attached to the cleaning component 317. The area of ​​the movable block 309 is larger than that of the cleaning component 317. When the movable block 309 is not moving, it protects the cleaning component 317. Optionally, the cleaning component 317 is a cleaning brush. One end of the cleaning component 317 is connected to the sealing seat 308, and the other end moves through the side wall of the contact block 310. The cleaning component 317 is used to clean the sensing end of the detection sensor 316 when the movable block 309 drives the piston component 321 to move towards the discharge pipe 303 in the sealing seat 308. When the device encounters an obstacle and triggers the movable block 309 to drive the piston 321 to move towards the discharge pipe 303, the cleaning component 317 scrapes or cleans the sensor sensing end surface along with the lateral displacement of the movable block 309. This can simultaneously remove silt, microbial film or impurities attached to the surface of the detection sensor 316 during the obstacle avoidance and buffering process, effectively preventing measurement signal distortion, data error or performance degradation caused by sensor end contamination.

[0029] Example 5 Not shown in the figure, based on Example 1, the adsorbent material particles stored in the main body of several devices in this example are different. The adsorbent material particles include: calcium-based adsorbent particles, ferric chloride particles and salt-activated zeolite particles. Among them, the calcium-based adsorbent particles are granulated by mixing calcium hydroxide with red soil and bentonite in a certain proportion. The amount of each component is selected according to the actual situation, which will not be described in detail here. The aforementioned ferric chloride particles are conventional processing materials in this field; Salt-activated zeolite particles are made using conventional techniques in the field, such as activating natural zeolite by soaking in salt solution followed by baking, high-temperature calcination, or alkali (acid) treatment, which can further improve the adsorption performance of zeolite. Optionally, this remediation device can flexibly select single or combined covering modes when remediating lake bottom sediment, for example: 1. Treatment with only calcium-based adsorbent particles; 2. Treatment by combined coverage of calcium-based adsorption particles and ferric chloride particles; 3. The treatment involves using calcium-based adsorption particles and salt-activated zeolite particles. Preferably, the salt-activated zeolite particles are coated first, followed by the calcium-based adsorption particles.

[0030] This multi-material, multi-mode design makes the remediation process highly targeted and adaptable, capable of simultaneously and efficiently removing pollutants such as phosphorus and nitrogen from sediment, meeting the treatment needs of different pollution loads and water quality characteristics, while enhancing the durability and environmental compatibility of the remediation effect.

[0031] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An in-situ remediation device for controlling nitrogen and phosphorus release from urban lake sediments using adsorption materials, characterized in that, It includes several device bodies, each device body comprising: Mounting section (100) for mounting on surface mobile equipment; The quantitative feeding unit (200) includes a box (201) and a storage chamber (202) for storing adsorbent material particles opened in the box (201). The bottom of the box (201) has a plurality of discharge ends for discharging adsorbent material particles. Several discharge covers (300) are provided, each of which is connected to a discharge end. Each discharge cover (300) includes a guide pipe (301) connected to the discharge end, a discharge pipe fitting movably sleeved on the outside of the guide pipe (301), a base frame (305) located at the end of the discharge pipe fitting away from the guide pipe (301), and a detection sensor (316) located on the base frame (305) for detecting the distance data between the discharge pipe fitting and the lake bottom sediment. The discharge pipe fitting is connected to the box body (201) through a first telescopic device (307). The first telescopic device (307) adjusts the height of the discharge pipe fitting based on the distance data fed back by the detection sensor (316).

2. The in-situ repair device according to claim 1, characterized in that, The mounting section (100) includes a mounting bracket (101) for connecting to a surface mobile device, and an electric slide rail device (102) for connecting the mounting bracket (101) and the housing (201).

3. The in-situ repair device according to claim 1, characterized in that, The quantitative feeding unit (200) further includes a receiving cavity opened in the box (201) and located below the storage cavity (202), a rotating roller (203) rotatably disposed in the receiving cavity, and a rotating device (206) disposed on the side wall of the box (201) for driving the rotating roller (203) to rotate. The storage cavity (202) and the receiving cavity are connected through a number of discharge ports (205). The receiving cavity is connected to each discharge end, and the discharge ports (205) correspond one-to-one with the discharge ends. The outer circumference of the rotating roller (203) is provided with a number of receiving grooves (204) in a ring array for cooperating with the discharge ports (205) and the discharge ends. The receiving grooves (204) are used to contain adsorbent material particles.

4. The in-situ repair device according to claim 1, characterized in that, A sealing seat (308) is provided on one side of the base frame (305). A matching piston (321) is movably provided at one end of the sealing seat (308). The piston (321) is connected to the inner wall of one side of the sealing seat (308) through an elastic element (314). A movable block (309) is connected to the side of the piston (321) away from the elastic element (314). The movable block (309) passes through one side of the sealing seat (308) and is connected to a contact block (310). An inclined protrusion (311) is integrally provided on the side of the contact block (310) away from the movable block (309). Several sets of ball bearings (312) are embedded at the bottom of the inclined protrusion (311). A groove for installing a detection sensor (316) is opened at the bottom of the contact block (310).

5. The in-situ repair device according to claim 4, characterized in that, The discharge pipe fitting includes a discharge pipe one (302) movably sleeved on the outside of the guide pipe (301), a discharge pipe two (303) spaced below the discharge pipe one (302) and coaxial with the discharge pipe one (302), two sets of corrugated pipes (304) arranged sequentially from the inside to the outside between the discharge pipe one (302) and the discharge pipe two (303), and an elastic connecting rod arranged in the connection between the discharge pipe one (302) and the discharge pipe two (303) and located in the two sets of corrugated pipes (304). The outer wall of the discharge pipe one (302) is also provided with a self-lifting part for driving the discharge pipe two (303) to move relative to the discharge pipe one (302).

6. The in-situ repair device according to claim 5, characterized in that, The self-lifting part includes a sleeve (313) fixedly sleeved on the outer wall of the discharge pipe (302), an annular cavity opened in the sleeve (313), and a piston ring (320) movably disposed in the annular cavity. The sleeve (313) is connected to a sealing seat (308) through a pipeline. The sealing seat (308) and the side of the piston ring (320) and the pipeline are both filled with driving medium. A number of pull ropes (315) are connected to one side of the piston ring (320). One end of the pull rope (315) extends into the two sets of corrugated pipes (304) and connects to the discharge pipe two (303). When the movable block (309) drives the piston (321) to move towards the discharge pipe two (303) in the sealing seat (308), the driving medium is pressurized and transmitted to the annular cavity through the pipeline to push the piston ring (320) to move upward in the annular cavity. Then the piston ring (320) pulls the discharge pipe two (303) upward through the pull rope (315).

7. The in-situ repair device according to claim 6, characterized in that, The sealing seat (308) is provided with a one-way inlet pipe (319) and a one-way outlet pipe (318). The one-way inlet pipe (319) is provided with a filter screen. The other end of the one-way outlet pipe (318) extends into the groove and corresponds to the sensing end of the detection sensor (316). When the moving block (309) drives the piston (321) to move towards the discharge pipe (303) side in the sealing seat (308), the one-way inlet pipe (319) draws water from the water area into the sealing seat (308). When the piston (321) moves in the opposite direction to reset, the one-way outlet pipe (318) discharges the water in the sealing seat (308) into the groove and flows to the detection sensor (316) to clean it. The bottom of the movable block (309) is fitted with a cleaning component (317). One end of the cleaning component (317) is connected to the sealing seat (308), and the other end moves through the side wall of the contact block (310). The cleaning component (317) is used to clean the sensing end of the detection sensor (316) when the movable block (309) drives the piston component (321) to move in the sealing seat (308) toward the discharge pipe (303).

8. The in-situ repair device according to claim 5, characterized in that, The base frame (305) has an opening that communicates with the discharge pipe (303). A sealing plate (306) is movably installed in the opening. The sealing plate (306) is connected to a second telescopic device (322) embedded in the base frame (305). The second telescopic device (322) is used to drive the sealing plate (306) to move to open or close the opening.

9. The in-situ repair device according to claim 1, characterized in that, The adsorbent material particles stored in the main body of several devices are different, including: calcium-based adsorbent particles, ferric chloride particles and salt-activated zeolite particles. The calcium-based adsorbent particles are formed by granulation of calcium hydroxide, red soil, and bentonite in a certain proportion.

10. An in-situ remediation method for controlling nitrogen and phosphorus release from urban lake sediments using adsorbent materials, comprising the in-situ remediation device as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Install it on the surface mobile equipment via the mounting part (100) of the main body of the device; S2: The mobile device moves through the urban lake. During this process, the sensor (316) continuously monitors the distance between the bottom of the discharge pipe and the surface of the lake bottom mud. The first telescopic device (307) adjusts the height of the discharge pipe in real time based on the distance data fed back by the sensor, so that the bottom of the pipe always maintains the preset working height with the bottom mud. S3: The adsorbent material particles stored in the storage chamber (202) are fed into the guide pipe (301) through the discharge end at the bottom of the box (201), and then the adsorbent material particles are discharged from the guide pipe (301) and the discharge pipe to cover the surface of the lake bottom mud.

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