An in-situ soil flushing remediation system

Abstract

The application discloses an in-situ soil remediation system, which comprises a cleaning liquid storage unit, a medicine injection unit, an extraction unit and a water treatment unit, the medicine injection unit is connected with the cleaning liquid storage unit and extends into the air zone, the extraction unit extends into the underground water, the water treatment unit comprises a device main body, a first mud-water separation mechanism, a second mud-water separation mechanism and a water flowing mechanism, a sedimentation chamber, a coagulation chamber and a filter chamber are sequentially arranged in the device main body, the extraction unit is connected with the sedimentation chamber, the filter chamber is connected with the cleaning liquid storage unit, and the first mud-water separation mechanism and the second mud-water separation mechanism are arranged outside the sedimentation chamber and the coagulation chamber respectively. Through soil leaching and filtration, large particles and pollutants such as heavy metals in the water body are removed, clean water flows back into the cleaning liquid storage unit to realize recycling, and the precipitates at the bottom of the sedimentation chamber and the coagulation chamber can be cleaned, and the impurities mixed in the water body can be intercepted.

Description

Technical Field

[0001] This invention relates to the field of soil leaching technology, and in particular to an in-situ leaching soil remediation system. Background Technology

[0002] Soil leaching technology refers to the technique of injecting chemical solvents that can promote the dissolution or migration of soil pollutants into contaminated soil, thereby dissolving, separating and treating the pollutants from the soil.

[0003] Soil in-situ leaching remediation technology, as one of the soil leaching technologies, is a technique that directly extracts, treats, and separates contaminated soil from the soil layer. It mainly involves injecting a leaching solution into the contaminated soil, allowing it to penetrate and absorb contaminants such as heavy metals. The contaminant-laden leaching solution then seeps into groundwater. By extracting and filtering the groundwater, the leaching wastewater is remediated, and the leaching solution can be reused, thus saving costs.

[0004] When filtering extracted groundwater, soil and various pollutants are separated, such as through sedimentation tanks and flocculation tanks to separate solids and liquids. Finally, filter media such as activated carbon adsorb the pollutants in the water to achieve the purpose of cleaning the water. However, whether in sedimentation tanks or flocculation tanks, especially in flocculation tanks, traditional flocculation tanks carry away various sediments by flowing with the water. However, this method has drawbacks. When the water flow rate is insufficient, or when the sediment is in a dead zone, a large amount of sediment will accumulate at the bottom of the sedimentation tank. This not only affects the use of the flocculation tank, but also affects the thorough mixing of water and flocculant. After flocculation, relatively clean water rises to the top of the tank, while most of the sediment sinks to the bottom. Clean water is discharged from the top of the flocculation tank to flow to the next process. However, a small amount of smaller flocculent material will still be discharged from the top of the flocculation tank with the clean water, which will have an adverse effect on the next process. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an in-situ leaching soil remediation system to solve the problem of sediment at the bottom of the flocculation tank not being cleaned and sediment being carried in the water discharged from the top of the flocculation tank.

[0006] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is: providing an in-situ leaching soil remediation system, specifically including a cleaning fluid storage unit for storing cleaning fluid for leaching soil, a chemical injection unit, an extraction unit, and a water treatment unit; the input end of the chemical injection unit is connected to the output end of the cleaning fluid storage unit, and the output end of the chemical injection unit is arranged on the contaminated ground and extends into the vadose zone layer of the contaminated ground to inject cleaning fluid into the vadose zone layer of the soil, so that the cleaning fluid penetrates into the soil to remove pollutants from the soil; the input end of the extraction unit penetrates into the vadose zone layer and extends... In the groundwater treatment unit, the output end of the extraction unit extends beyond the bottom surface to facilitate the extraction of pollutants that have seeped into the groundwater, preventing excessive contamination. The water treatment unit includes a main body containing a sedimentation chamber, a coagulation chamber, and a filtration chamber. The output end of the extraction unit is connected to the input end of the sedimentation chamber, allowing the mixed water extracted from the extraction unit to be transported to the sedimentation chamber for preliminary sedimentation. The output end of the filtration chamber is connected to the input end of the cleaning solution storage unit, and the filtration chamber is filled with filter media to ensure the final filtered water is transported. The cleaning fluid is reused in the storage unit, thus saving costs. The water treatment unit also includes a first mud-water separation mechanism and a second mud-water separation mechanism installed on the main body of the device. The input and output ends of the first mud-water separation mechanism are respectively connected to the bottom of the sedimentation chamber and the coagulation chamber to extract the sediment at the bottom of the sedimentation chamber and perform mud-water separation. The separated water is sent to the coagulation chamber for flocculation treatment. The input and output ends of the second mud-water separation mechanism are respectively connected to the bottom of the coagulation chamber and the filter chamber to extract the sediment at the bottom of the coagulation chamber and perform mud-water separation. The separated water is sent to the coagulation chamber for flocculation treatment. The water is sent to the filtration chamber for filtration, thus preventing sediment from accumulating at the bottom of the sedimentation and coagulation chambers. A water flow mechanism is installed at the top of the coagulation chamber, and the output end of the water flow mechanism is connected to the filtration chamber. When the water in the coagulation chamber overflows the input end of the water flow mechanism, the water flows naturally into the water flow mechanism. At the same time, clear water can be output without the use of power equipment. Even if there are flocculent particles in the clarified water at the top, they will gradually stay in the water flow mechanism when they enter it and will not be discharged into the filtration chamber, thus affecting the use of the filter media in the filtration chamber.

[0007] Furthermore, the injection unit includes a main pipe with its input end connected to the output end of the cleaning fluid storage unit and an injection well vertically inserted into the vadose zone layer and connected to the main pipe at its top. The main pipe is evenly laid on the ground, and the injection wells are set in multiple and distributed at equal intervals, so as to rinse the contaminated soil in various places and thus repair the soil.

[0008] Furthermore, the main tube includes a hollow outer tube and a hollow inner tube coaxially disposed within the outer tube. A first conveying cavity is formed between the inner wall of the outer tube and the outer wall of the inner tube, and a second conveying cavity is formed within the inner tube. The first and second conveying cavities are respectively connected to the output end of the cleaning fluid storage unit, so that the cleaning fluid storage unit can convey cleaning fluid into the first and second conveying cavities respectively. Several spray heads connected to the first conveying cavity are evenly spaced at the bottom of the outer tube to spray cleaning fluid onto the ground. The injection well is connected to the second conveying cavity. The first conveying cavity sprays directly onto the bottom surface through the spray heads to mainly wash the upper soil layer of the vadose zone, while the lower soil layer is injected with cleaning fluid through the injection well connected to the second conveying cavity, ensuring that the lower soil layer can also be washed by the cleaning fluid, thereby further ensuring the washing effect.

[0009] Furthermore, two matching partitions are provided on both sides of the sedimentation chamber to block the water. Between the two partitions, a first passage that gradually narrows from bottom to top and a second passage in a "Z" shape are formed sequentially. A first outlet is provided at the top of the sedimentation chamber and above the second passage. The first outlet and the coagulation chamber are connected by a first water outlet pipe. The partitions can block some of the large particles floating in the water. When the water in the sedimentation chamber overflows the first outlet, the water naturally flows to the first water outlet pipe and is input into the coagulation chamber, thereby allowing more sediment to settle in the sedimentation chamber, thus performing preliminary filtration.

[0010] Furthermore, the coagulation chamber is located below the sedimentation chamber, allowing water to flow naturally into the coagulation chamber without the need for power equipment. A stirring section with an output shaft located in the coagulation chamber is provided on the main body of the device. A flocculant injection channel communicating with the coagulation chamber is provided on the main body of the device. The water flow mechanism is located directly above the stirring section. The use of the stirring section allows the flocculant to be more fully mixed with the water for flocculation treatment, while the clean water flows from the top of the coagulation chamber to the filtration chamber through the water flow mechanism.

[0011] Furthermore, an installation chamber is formed within the main body of the device and below the coagulation chamber, spaced apart by a first mounting plate. The stirring unit includes a drive component disposed within the installation chamber and a stirring frame disposed on the output shaft of the drive component within the coagulation chamber. The output shaft of the drive component is sealed and rotates through the first mounting plate. The stirring frame includes a main rod connected to the output shaft of the drive component and vertically arranged, and several stirring rods extending radially from the main rod in a direction perpendicular to the horizontal direction of the main rod, thereby achieving thorough mixing of flocculant and water. An electric slip ring is disposed on the first mounting plate, and the output shaft of the drive component is sealed and rotates through the electric slip ring. The flocculant injection channel includes a main channel formed within the first mounting plate and a branch channel formed on the main rod. The input end of the branch channel is connected to the main channel through the electric slip ring, and the output end is divided into several branches, each extending along the length of the stirring rod and penetrating each stirring rod, so that even during the rotation of the stirring rod, the flocculant can be delivered to each stirring rod and input into the coagulation chamber, so that it can be output from the stirring rod when the stirring frame stirs the water, ensuring that the water and flocculant can be mixed more thoroughly.

[0012] Furthermore, the end of each stirring rod away from the main rod is bent in the horizontal direction in the opposite direction to the rotation direction of the stirring rod to form a curved segment, so that the flocculant can be output along the water flow during the rotation of the stirring rod, while preventing water from entering the sub-channel during the rotation of the stirring rod.

[0013] Furthermore, each of the curved sections has a curved port connected to the sub-channel on the side away from the main rod. A baffle plate is hinged to the side of each curved port near the main rod to block the curved port. A first torsion spring is provided between the baffle plate and the curved port to block the curved port. The side of the baffle plate away from the main rod extends horizontally to form an extension end, so as to block the curved port when the stirring frame is not rotating, preventing water from directly entering the sub-channel and causing flocculants to accumulate in the sub-channel. Each extension end is connected to a balloon filled with gas by a rope. When the stirring frame rotates, the balloon will pull the baffle plate in the opposite direction of the stirring rod rotation along with the water flow, thereby opening the baffle plate and allowing the flocculant to be output.

[0014] Furthermore, the filtration chamber is located directly below the coagulation chamber. The water flow mechanism includes a wavy water pipe. The inlet of the water pipe connects to the coagulation chamber, and the outlet of the water pipe connects to the filtration chamber, enabling the water from the top of the coagulation chamber to be transported to the filtration chamber. When the water enters the water pipe, the curved shape of the pipe greatly slows down the water flow velocity. With the reduced flow velocity, any small amount of sediment carried in the water remains in the water pipe due to water pressure and the obstruction caused by the closure. The water pipe has several upward-curved transition sections, and between any two transition sections is a downward-curved submerged section. Both the transition sections and the submerged section have a first curve midpoint located above and a second curve midpoint located below. The height of the first curve midpoint of the submerged section is lower than that of the transition section. The height of the midpoint of the second bend of the pipe section, the input end of the water pipe is a transition pipe section and the midpoint of the first bend. When the water overflows the input end of the water pipe, the water will naturally flow into the water pipe. At this time, the water flow velocity will be relatively stable, and the sediment in the water pipe will also sink to the sinking pipe section. A first opening is formed at the midpoint of the second bend of each sinking pipe section, which is vertically downward. A baffle is hinged to the first opening to block the first opening. A second torsion spring is set between the baffle and the sinking pipe section. The second torsion spring causes the baffle to block the first opening. When the sediment on the baffle accumulates to a certain extent, it will press down on the baffle to open it, thereby automatically cleaning the sediment in the water pipe. At the same time, the baffle can also prevent water from directly entering the water pipe from the first opening and affecting the filtration effect of the water pipe.

[0015] Furthermore, the stirring rod at the top of the stirring rack is positioned close to the baffle so that when the stirring rack rotates, the water flow is laterally flowing, forcing the baffle to open briefly, and after the stirring rod passes around, it is driven by the second torsion spring to continue blocking the first opening.

[0016] The in-situ leaching soil remediation system of the present invention has at least the following beneficial effects:

[0017] By coordinating the cleaning solution storage unit, injection unit, extraction unit, and water treatment unit, cleaning solution is injected into the contaminated soil for rinsing, and water mixed with pollutants is extracted, thereby remediating the soil and protecting the environment. The water treatment unit filters the water to remove large particles and pollutants such as heavy metals, allowing the clean water to flow back into the cleaning solution storage unit for recycling and resource conservation. The first and second mud-water separation mechanisms within the water treatment unit work together to clean the sediment at the bottom of the sedimentation and coagulation chambers, preventing sediment accumulation that could affect water filtration. Simultaneously, the water flow mechanism transports relatively clean water from the coagulation chamber while preventing the retention of impurities mixed in the water, thus preventing water containing sediment from entering the filtration chamber and clogging the filter media, which would affect the filter media's lifespan. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 This is a circuit diagram of the in-situ leaching soil remediation system of the present invention;

[0020] Figure 2 This is a cross-sectional view showing the arrangement of the drug injection unit and the extraction unit of the present invention;

[0021] Figure 3 This is a cross-sectional view of the water treatment unit of the present invention;

[0022] Figure 4 for Figure 3 A magnified view of part A shown;

[0023] Figure 5 for Figure 3 A magnified view of part B shown;

[0024] Figure 6 for Figure 3 A magnified view of part C shown;

[0025] Figure 7 This is a top view of the stirring rack of the present invention.

[0026] The meanings of the labels in the attached diagram are as follows:

[0027] Washing solution storage unit-1; Injection unit-2; Main pipe-21; Outer pipe-211; Inner pipe-212; First delivery chamber-213; Second delivery chamber-214; First delivery pump-23; Injection well-22; Extraction unit-3; Third delivery pump-31; Water treatment unit-4; Main body of the device-41; First mounting plate-411; Second mounting plate-412; Third mounting plate-413; Installation chamber-414; First mud-water separation mechanism-42; Second mud-water separation mechanism-43; Mud separation chambers-421, 431; Water storage chambers-422, 432; Fourth outlet-423, 433; Third water outlet pipe-424, 434; Water pump-425, 435; Drain outlet-426, 436; Drying channel-427, 437; Sewage pipe-428, 438; Water flow mechanism-44; Water flow Pipe-441; Transition pipe section-4411; Submerged pipe section-4412; Midpoint of the first bend-4413; Midpoint of the second bend-4414; First opening-4415; Baffle-4416; Sedimentation chamber-45; Enclosure-451; Second passageway-4511; First outlet pipe-452; First inlet-453; First outlet-454; Coagulation chamber-46; Flocculant injection channel-4 61; Main channel - 4611; Sub-channel - 4612; Second outlet pipe - 462; Filter chamber - 47; Second delivery pump - 471; Return pipe - 472; Third outlet - 473; Stirring section - 48; Drive component - 481; Stirring frame - 482; Main rod - 4821; Stirring rod - 4822; Curved section - 4823; Baffle plate - 4824; Balloon - 4825; Electric slip ring - 483. Detailed Implementation

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Reference Figures 1 to 3 As shown, an in-situ leaching soil remediation system of the present invention includes a leaching liquid storage unit 1 for storing leaching liquid used for leaching soil, an injection unit 2 for injecting the leaching liquid in the leaching liquid storage unit 1 into the soil, an extraction unit 3 for extracting groundwater, and a water treatment unit 4 for filtering the mixed water extracted by the extraction unit 3. The water treatment unit 4 then transports the filtered water to the leaching liquid storage unit 1 for repeated use.

[0030] The cleaning solution storage unit 1 includes a storage tank containing cleaning solution, which can be water or a solution containing chemical additives. The cleaning solution is used to leach pollutants into the soil, dissolving or migrating them and separating the pollutants from the soil. After filtration, the solution can be recycled or reused multiple times to remove pollutants. For cleaning solutions containing chemical additives, the cleaning solution storage unit 1 also includes a dosing mechanism for preparing the appropriate cleaning solution according to work requirements. The storage tank has an input end and an output end connecting the inside and outside of the storage tank. The input end is connected to the water treatment unit 4 to recover the filtered cleaning solution, while the output end is connected to the dosing unit 2. A first delivery pump 23 is installed between the output end and the dosing unit 2 to deliver the cleaning solution from the storage tank.

[0031] The input end of the injection unit 2 is connected to the output end of the cleaning fluid storage unit 1. The output end of the injection unit 2 is arranged on the contaminated ground and extends into the vadose zone of the contaminated ground to inject cleaning fluid into the vadose zone of the soil to achieve rinsing treatment of the soil.

[0032] Reference Figure 2 As shown, the injection unit 2 includes a main pipe 21 whose input end is connected to the output end of the cleaning fluid storage unit 1 and an injection well 22 vertically inserted into the vadose zone layer and whose top end is connected to the main pipe 21. The main pipe 21 can be configured as multiple pipes or as a single pipe that is bent to be evenly distributed on the ground. Several injection wells 22 are provided on each pipe or section of the main pipe 21 at equal intervals to inject cleaning fluid into the soil at different locations in the vadose zone layer for rinsing.

[0033] The main pipe 21 defined in this invention includes a hollow outer pipe 211 and a hollow inner pipe 212 coaxially disposed within the outer pipe 211. The outer pipe 211 is sleeved on the outside of the inner pipe 212, forming a first conveying cavity 213 between the inner wall of the outer pipe 211 and the outer wall of the inner pipe 212. A second conveying cavity 214 is formed inside the inner pipe 212. The first and second conveying cavities 213 and 214 are respectively connected to the output end of the storage tank, so that the first conveying pump 23 can convey cleaning fluid into the first and second conveying cavities 213 and 214 respectively during operation. A plurality of spray heads communicating with the inside and outside of the first conveying cavity 213 are equally spaced at the bottom of the outer pipe 211. After the cleaning fluid is injected into the first conveying cavity 213, the spray heads spray the cleaning fluid onto the ground. The injection well 22 is connected to the second conveying cavity 214 to wash deeper layers of soil. Since the rinsing of the cleaning fluid is mainly achieved through the infiltration between water and soil, and even in soil with high permeability, some water will remain in the soil, the first delivery chamber 213 mainly targets the upper soil layer for rinsing, and the vertical spraying method makes the rinsing area wider and more comprehensive. When the vertically arranged injection well 22 injects the cleaning fluid into the soil through the second delivery chamber 214, due to the permeability of the cleaning fluid, the cleaning fluid tends to seep downwards when it exits from the injection well 22. This may result in the soil closer to the top not being fully rinsed, and the rinsing mainly targets the lower soil layer. However, the combination of the first delivery chamber 213 and the spray head can complement each other to solve this problem and improve the rinsing effect.

[0034] The extraction unit 3 includes an extraction well with its inlet and outlet ends vertically penetrating the vadose zone and extending into the groundwater layer, and an output pipe connected to the output end of the extraction well. The output end of the extraction well is located on the ground, while the output pipe is either a single pipe bent to be evenly laid on the ground, or multiple output pipes arranged parallel to each other at equal intervals on the ground. A third delivery pump 31 is installed on the output pipe. Several extraction wells are configured and connected to the output pipe, and each extraction well is distributed at various points on the output pipe. They can be evenly spaced and corresponding to each injection well 22. For example, along the distribution direction of the main pipe 21, one extraction well is set for every at least one injection well 22 to facilitate the extraction of groundwater from various locations.

[0035] Reference Figure 3As shown, the water treatment unit 4 includes a main body 41, a first mud-water separation mechanism 42 mounted on the main body 41, a second mud-water separation mechanism 43 mounted on the main body 41, and a water flow mechanism 44 mounted on the main body 41. A sedimentation chamber 45, a coagulation chamber 46, and a filtration chamber 47 are sequentially arranged within the main body 41. The output end of the output pipe is connected to the output end of the sedimentation chamber 45, and the output end of the sedimentation chamber 45 is connected to the input end of the coagulation chamber 46. The water flow mechanism 44 is located at the top of the coagulation chamber 46 and is connected to the coagulation chamber 46. The inner cavity has a water flow mechanism 44 whose output end is connected to the filter chamber 47, thus connecting the output end of the coagulation chamber 46 and the input end of the filter chamber 47. The output end of the filter chamber 47 is connected to the input end of the storage tank, so that the water extracted from the extraction well is first transported to the sedimentation chamber 45 for preliminary sedimentation. The extraction well is directly extracted from groundwater, which carries large particles such as silt. The purpose of the sedimentation chamber 45 is to allow the large particles in the water to naturally settle to the bottom. The upper part of the sedimentation chamber 45 is mainly water, which is directly output from the top surface of the sedimentation chamber 45, achieving the initial separation of solids such as silt and liquids. After the water enters the flocculation chamber, flocculation treatment is carried out, causing the sludge and other substances in the water to agglomerate into flocculent coagulates, thereby achieving secondary separation between solids and liquids through sedimentation. The filter chamber 47 is filled with filter media, which can adsorb pollutants such as heavy metals absorbed in the water, thereby removing the pollutants from the water and achieving water filtration. The output end of the filter chamber 47 and the input end of the storage tank are connected by a return pipe 472. The filtered water is transported to the storage tank through the return pipe 472 for reuse, thereby saving water resources. A second delivery pump 471 is installed on the return pipe 472. The input end of the first mud-water separation mechanism 42 is connected to the bottom of the sedimentation chamber 45, while the output end of the first mud-water separation mechanism 42 is connected to the coagulation chamber 46. This allows the water containing a large amount of sediment at the bottom of the sedimentation chamber 45 to be periodically pumped away and separated into solids and liquids. The separated liquid is then transported to the coagulation chamber 46 for flocculation treatment to prevent the accumulation of a large amount of sediment at the bottom of the sedimentation chamber 45, which would gradually breed a large number of microorganisms. Furthermore, the accumulated sediment would cause the sediment at the top to be closer to the output end of the sedimentation chamber 45, which could lead to substances that should be settled being transported into the coagulation chamber 46, causing further problems.The input end of the second mud-water separation mechanism 43 is connected to the bottom of the coagulation chamber 46, and the output end of the second mud-water separation mechanism 43 is connected to the filter chamber 47. This allows for the extraction of water containing a large amount of sediment at the bottom of the coagulation chamber 46 and the separation of solids and liquids. The separated liquid is then transported to the filter chamber 47 for adsorption and filtration. This prevents a large amount of sediment from accumulating at the bottom of the coagulation chamber 46, which would affect the concentration of the flocculant after mixing with the water. This also prevents the mixing of the flocculant and the water from affecting the flocculation effect.

[0036] The main body 41 of the device can be a tank structure with a hollow interior. Inside the main body 41, it is divided into independent sedimentation chamber 45, coagulation chamber 46, filtration chamber 47, and installation chamber 414 by means of a first mounting plate 411, a second mounting plate 412, and a third mounting plate 413, with the second mounting plate 412, the first mounting plate 411, and the third mounting plate 413 arranged sequentially from top to bottom. Preferably, the sedimentation chamber 45, the coagulation chamber 46, the installation chamber 414, and the filtration chamber 47 are arranged sequentially from top to bottom.

[0037] Reference Figure 3As shown, two matching enclosures 451 are provided on both sides of the sedimentation chamber 45 to block the water. Between the two enclosures 451, a first passage that gradually narrows from bottom to top and a second passage 4511 in the shape of a "Z" are formed sequentially from bottom to top. The part of the two enclosures 451 where the first passage is located is inclined outward from top to bottom; the two enclosures 451 where the second passage 4511 is located are bent in a complementary "Z" shape from bottom to top. When water is supplied to the sedimentation chamber 45 through the output pipe, the input of the water creates turbulence throughout the sedimentation chamber 45, causing the water to tumble. Some of the large particles mixed in the water will move with the water within the sedimentation chamber 45. The gradually narrowing first passage causes the large particles in the water to collide with the side panels 451 on both sides of the first passage as the water gradually flows upward to the second passage 4511, preventing them from floating upward. Even if some still cross the first passage, the second passage 4511 will also block the large particles as they move upward with the water flow in the vertical or other directions. Preferably, each side wall of the side panels 451 on both sides of the second passage 4511 is inclined relative to the vertical direction, so that the large particles can slide down the inner wall of the second passage 4511 to the bottom of the sedimentation chamber 45 after being blocked by the second passage 4511, thus completing the sedimentation of the large particles. A first inlet 453 for connecting the output pipe is provided inside the sedimentation chamber 45 and below the enclosure 451, so that the extraction unit 3 can input groundwater into the sedimentation chamber 45. A first outlet 454 is provided at the top of the sedimentation chamber 45 and above the second passage 4511. The first outlet 454 and the coagulation chamber 46 are connected by a first water outlet pipe 452. When the water flows through the first passage and the second passage 4511 in sequence, the upward water flow is slowed down due to the obstruction caused by the collision with the enclosure 451. The slowed water flow not only facilitates the sedimentation of large particles carried in the water, but also, after the water flow velocity is effectively blocked by the enclosure 451, the water that has flowed through the second passage 4511 naturally flows through the first outlet 454. Through the difference in water level, the water flows naturally into the coagulation chamber 46 through the first water outlet pipe 452, avoiding further agitation of the water flow by using power equipment to output water, so that some large particles are not allowed to settle before being input into the coagulation chamber 46.

[0038] Reference Figure 3As shown, the coagulation chamber 46 has a second inlet and a second outlet. The second inlet corresponds to the input end of the coagulation chamber 46, and the second outlet corresponds to the output end of the coagulation chamber 46. The first outlet pipe 452 is connected to the second inlet. A stirring section 48 with an output shaft located inside the coagulation chamber 46 is provided on the main body 41 of the device to stir the water inside the coagulation chamber 46. A flocculant injection channel 461 communicating with the coagulation chamber 46 is provided on the main body 41 to inject flocculant into the coagulation chamber 46. Combined with the stirring section 48, this allows for more thorough mixing of the water and flocculant, causing pollutants in the water to coagulate into large particles and then settle, thereby achieving the purpose of separating pollutants from the water. A water flow mechanism 44 is located directly above the stirring section 48, and the output end of the water flow mechanism 44 is connected to the second outlet to allow the water above to be output into the filtration chamber 47.

[0039] Reference Figure 3 and Figure 7 As shown, the stirring unit 48 includes a drive component 481 disposed within the mounting chamber 414 and a stirring frame 482 disposed on the output shaft of the drive component 481 within the coagulation chamber 46. The drive component 481 can be a motor or a rotary cylinder, etc. A first through hole is vertically formed at the center of the first mounting plate 411, and an electric slip ring 483 is disposed within the first through hole. The edges of the electric slip ring 483 are sealed to the inner wall of the first through hole. The output shaft of the drive component 481 passes through the through hole on the electric slip ring 483 in a sealed manner, so that the output shaft of the drive component 481 passes through the first mounting plate 411 in a sealed manner. The stirring frame 482 includes a main rod 4821 connected to the output shaft of the drive unit 481 and vertically arranged, and a plurality of stirring rods 4822 extending radially from the main rod 4821 in a horizontal direction perpendicular to the main rod 4821. The operation of the drive unit 481 can drive the main rod 4821 to rotate. One end of each stirring rod 4822 is connected to the main rod 4821, and the other end of each stirring rod 4822 extends horizontally in different radial directions along the main rod 4821 so that the stirring rods 4822 are radially distributed so as to agitate the water. It should be noted that the electric slip ring 483 can directly use the existing structure, or the electric slip ring 483 can be configured as another structure including a cylindrical body, with a rotating through hole opened in the cylindrical body along its axial direction, a bearing fixed and sealed in the rotating through hole, the outer ring and rolling element of the bearing being embedded in the cylindrical body, only the inner ring being movable, a sealing ring being provided between the top surface of the inner ring and the cylindrical body to achieve sealing, and an injection hole opened in the cylindrical body along the radial direction, and an annular injection groove being formed around the outer side wall of the output shaft at the position corresponding to the injection hole; the output shaft of the drive member 481 is sealed through the inner ring to extend into the coagulation chamber 46.

[0040] Reference Figure 5As shown, the flocculant injection channel 461 includes a main channel 4611 formed in the first mounting plate 411 and a branch channel 4612 formed on the output shaft of the main rod 4821 and the drive member 481. The main channel 4611 is connected to an external flocculant injection device. The input end of the branch channel 4612 is connected to the main channel 4611 via an electric slip ring 483 or an injection groove. The output end of the branch channel 4612 is divided into several parts and extends along the length of the stirring rod 4822 until it penetrates each stirring rod 4822, so that the injection device can inject into the main channel 4611. After flocculant is applied, it enters the sub-channel 4612 through the main channel 4611 and is output to the coagulation chamber 46 by the stirring rod 4822. This not only allows the flocculant to be output from various directions, but also, when the drive unit 481 operates to rotate the stirring frame 482, the flocculant is output from the stirring rod 4822 during the rotation process. As the stirring rod 4822 rotates, it mixes with the water at different locations, allowing the flocculant to be dispersed in various parts of the coagulation chamber 46. Combined with the stirring of the stirring frame 482, the mixing of the flocculant and the water is more thorough.

[0041] Preferably, the end of each stirring rod 4822 furthest from the main rod 4821 is bent horizontally in the opposite direction to the rotation direction of the stirring rod 4822, forming a curved segment 4823. A branch channel 4612 penetrates each curved segment 4823, so that each curved segment 4823 has a curved port connected to the branch channel 4612 on the side furthest from the main rod 4821. The curved port is a vertical plane, so that when the flocculant is output through each branch channel 4612, since the stirring frame 482 is mostly in a rotating state, the water, under the stirring of the stirring rod 4822, undergoes a phenomenon similar to the Karman vortex street near the stirring rod 4822. Turbulence can occur, potentially forcing a small amount of water into the distribution channel during the rotation of the stirring rod 4822. If the water contains sediment, it could block the curved port, affecting the output of the flocculant and proper mixing. However, the curved section 4823, when the stirring rod 4822 rotates, directs the water flow from the curved section 4823 toward the rear of the stirring rod 4822, i.e., in the opposite direction to the movement of the outer end of the stirring rod 4822, and gradually disperses outwards. Therefore, during the rotation of the stirring rod 4822, sediment will not approach the curved port due to the water flow, thus preventing the curved port from being blocked during the stirring process.

[0042] Reference Figure 6As shown, since the mixing rack 482 does not rotate continuously, when water is introduced into the coagulation chamber 46 while the mixing rack 482 is not rotating, there is a possibility that sediment may enter the sub-channel 4612 and block the curved port where the mixing rod 4822 is located near the bottom. Therefore, preferably, a baffle 4824 that can block the curved port is hinged to the side of each curved port near the main rod 4821, or it can be hinged at any position of the curved port; the baffle 4824 and the curved port A first torsion spring is provided to block the curved port of the baffle 4824. That is, under no external force, the first torsion spring ensures that the baffle 4824 blocks the curved port. The first torsion spring is in a normal or contracted state when the baffle 4824 blocks the curved port, and in a contracted state when the baffle 4824 is extended relative to the curved port. This ensures that when the stirring rod 4822 is stationary, the baffle 4824 always blocks the curved port, preventing sediment from entering the distribution channel 4612. Preferably, the side of the baffle 4824 away from the main rod 4821 extends horizontally to form an extension end, so that when the stirring rod 4822 rotates, the baffle 4824 is opened by water flow. To further ensure that the baffle 4824 does not affect the flocculant output when the stirring rod 4822 rotates, it is preferable that each extension end is connected by a string to a balloon 4825 filled with gas. Since the balloon 4825 is lighter than water and has a larger volume, it experiences greater resistance. After the stirring rod 4822 rotates, the balloon 4825 remains behind the curved end due to the resistance from the water. Upon impact with the water, the surface of the balloon 4825 pulls towards the rear of the stirring rod 4822, significantly widening the baffle 4824. This ensures that the baffle 4824 remains deployed during the rotation of the stirring rod 4822, thus not affecting the flocculant output. Simultaneously, the surface of the balloon 4825 impacts the water in multiple directions as the stirring rod 4822 moves, creating multi-directional water flow near the balloon 4825, further promoting thorough mixing of the water and flocculant.

[0043] The filter chamber 47 is located at the bottom of the device housing. A third outlet 473 is provided on the bottom surface of the filter chamber 47. A filter screen is installed at the third outlet 473. The filter chamber 47 is filled with filter media such as activated carbon to adsorb pollutants such as heavy metals in the water. When the water flows to the third outlet 473 by gravity, it is connected to the input end of the storage tank through a return pipe 472 to facilitate the transport of the filtered water in the filter chamber 47 to the storage tank for circulation.

[0044] The first mud-water separation mechanism 42 and the second mud-water separation mechanism 43 both include a separator body. The separator body has a mud-blocking chamber 421 and 431 with an open top and a water storage chamber 422 and 432 located below the mud-blocking chamber 421 and 431. A sewage pipe 428 and 438 are provided between the bottom of the first mud-water separation mechanism 42 and the sedimentation chamber 45, and between the bottom of the second mud-water separation mechanism 43 and the coagulation chamber 46 for connection. A fourth delivery pump is provided on the sewage pipe 428 and the sewage pipe 438 to start and output the sewage at the bottom of the sedimentation chamber 45 and the coagulation chamber 46 at regular intervals. The mud-separating chamber 421 and the water storage chamber 422, as well as the mud-separating chamber 431 and the water storage chamber 432, are separated by a fourth mounting plate. The water storage chambers 422 and 432 are provided with a fourth output port 423, 433 and a fifth output port. The fourth output ports 423 and 433 are located at the top of the water storage chambers 422 and 432 and are connected to the input end of an exhaust fan to create a negative pressure in the water storage chambers 422 and 432. The first mud-water separation mechanism 42 and the coagulation chamber 46, and the fifth outlet of the second mud-water separation mechanism 43 and the filter chamber 47 are all connected by a third water outlet pipe 424, 434. A water pump 425, 435 is installed on each of the third water outlet pipes 424, 434. Alternatively, the water storage chambers 422, 432 are set at a position higher than the coagulation chamber 46, and the fifth outlet is located at the bottom of the water storage chambers 422, 432. Thus, according to the difference in water level, the water in the water storage chambers 422, 432 is transported to the corresponding coagulation chamber 46 or filter chamber 47. A drain outlet 426, 436 is vertically formed on the fourth mounting plate. A filter screen is installed at each drain outlet 426, 436. When a negative pressure is formed in the water storage chambers 422, 432, the water in the mixed water at the bottom of the coagulation chamber 46 or sedimentation chamber 45, which contains a large amount of sediment, is drawn downwards. The sediment is retained in the mud-separating chambers 421, 431, thus achieving solid-liquid separation. The first mud-water separation mechanism 42 and the second mud-water separation mechanism 43 operate intermittently, with the specific interval determined by the actual sedimentation volume. It should be noted that the first mud-water separation mechanism 42 and the second mud-water separation mechanism 43 can also be directly replaced by a filter press.

[0045] Preferably, the fourth mounting plate is provided with drying channels 427 and 437 distributed in a tree-like structure, and several through holes connecting the drying channels 427 and 437 are opened downward on the top surface of the fourth mounting plate. The drying channels 427 and 437 are connected to an external dryer for drying the separated precipitates, thereby facilitating the treatment of the precipitates.

[0046] Reference Figure 3 and Figure 4As shown, the water flow mechanism 44 includes a wave-shaped water pipe 441. The entire water pipe 441 is located inside the coagulation chamber 46. The inlet end of the water pipe 441 is connected to the coagulation chamber 46, and the outlet end of the water pipe 441 is connected to a second outlet to connect to the filter chamber 47, so that the water in the coagulation chamber 46 is output to the filter chamber 47 through the water pipe 441. The arrangement of the water pipe 441 ensures that even if the water contains a small amount of sediment entering the water pipe 441, it will sink due to collision with the inner wall of the water pipe 441 as it flows inside, thereby effectively reducing or even preventing sediment from being transported to the filter chamber 47.

[0047] Specifically, the water pipe 441 has several upward-curving transition pipe sections 4411, and between any two transition pipe sections 4411 there is a downward-curving sunken pipe section 4412 to form a wave-like structure. The transition pipe section 4411 has an upper first arc midpoint 4413a, the sunken pipe section 4412 has an upper first arc midpoint 4413b, the transition pipe section 4411 has a lower second arc midpoint 4414a, and the sunken pipe section 4412 has a lower second arc midpoint 4414b. The first arc midpoint 4413a in the transition pipe section 4411 is its highest point, and the second arc midpoint 4414b in the sunken pipe section 4412 is its lowest point. The height of the midpoint 4413b of the first bend of the submerged pipe section 4412 is lower than the height of the midpoint 4414b of the second bend of the transition pipe section 4411. This causes the water to flow into the water pipe 441 and down to the submerged pipe section 4412, impacting the section between the midpoint 4413a of the first bend of the transition pipe section 4411 and the midpoint 4413b of the first bend of the submerged pipe section 4412. This significantly slows down the water flow and causes the water to flow downwards, carrying sediment to the midpoint 4414b of the second bend of the submerged pipe section 4412. Furthermore, due to the obstruction of the inner wall of the submerged pipe section 4412, the sediment is unlikely to flow into the next transition pipe section 4411, thus achieving the purpose of intercepting the sediment. Preferably, the inlet end of the water pipe 441 is a transition pipe section 4411, which is vertically cut off at the midpoint 4413a of the first bend. In this way, when the water level in the coagulation chamber 46 overflows the inlet end of the water pipe 441, the water flows into the water pipe 441 naturally without the need for power equipment. The water is output only through the difference between high and low water levels, so that the water enters the water pipe 441 at a relatively low flow rate. Through the collision in the water pipe 441, the water can flow through the water pipe 441 at a relatively gentle speed, which facilitates the sedimentation of the precipitate.

[0048] Preferably, a first opening 4415 extending vertically downwards is formed at the midpoint 4414b of the second bend of each submerged pipe section 4412 to connect the water pipe 441 and the coagulation chamber 46. A baffle 4416 is hinged at the first opening 4415 to block it. A second torsion spring is provided between the baffle 4416 and the submerged pipe section 4412. The second torsion spring causes the baffle 4416 to block the first opening 4415. That is, when the baffle 4416 blocks the first opening 4415, the second torsion spring is in a contracted or normal state. When enough sediment accumulates on the baffle 4416 and reaches a certain weight, the sediment presses down on the baffle 4416, causing the second torsion spring to contract and the baffle 4416 to open the first opening 4415, so that the sediment on the baffle 4416 can be discharged from the water pipe 441, avoiding excessive sediment accumulation in the water pipe 441 and blocking it. Preferably, the uppermost stirring rod 4822 of the stirring rack 482 is positioned close to the baffle 4416, so that when the stirring rod 4822 rotates and passes under each baffle 4416, the stirring of the stirring rod 4822 forces the water to flow laterally and pass under the baffle 4416. When the water flows laterally under the baffle 4416, it generates negative pressure, causing the baffle 4416 to open and adsorb the sediment in the sinking pipe section 4412 into the coagulation chamber 46. After the stirring rod 4822 passes the baffle 4416, the baffle 4416 returns to its original position under the action of the second torsion spring to close the first opening 4415. As the stirring proceeds, each baffle 4416 opens and closes intermittently to adsorb the sediment on the baffle 4416.

Claims

1. An in-situ leaching soil remediation system, characterized in that, include: A cleaning fluid storage unit for storing cleaning fluid used in soil rinsing; The injection unit has an input end connected to the output end of the cleaning fluid storage unit and an output end arranged on the contaminated ground and extending into the vadose zone layer of the contaminated ground to inject cleaning fluid into the vadose zone layer of the soil. An extraction unit, wherein the input end of the extraction unit penetrates the vadose zone and extends into the groundwater, and the output end extends beyond the bottom surface; as well as A water treatment unit includes a main body containing a sedimentation chamber, a coagulation chamber, and a filtration chamber arranged sequentially within it. The output of an extraction unit is connected to the input of the sedimentation chamber, and the output of the filtration chamber is connected to the input of a cleaning solution storage unit. The filtration chamber is filled with filter media. The unit also includes a first mud-water separation mechanism and a second mud-water separation mechanism mounted on the main body. The input and output of the first mud-water separation mechanism are respectively connected to the bottom of the sedimentation chamber and the coagulation chamber, and the input and output of the second mud-water separation mechanism are respectively connected to the bottom of the coagulation chamber and the filtration chamber. A water flow mechanism is located at the top of the coagulation chamber, and the output of the water flow mechanism is connected to the filtration chamber. Two matching partitions are provided on both sides of the sedimentation chamber to block the water. A first passage that gradually narrows from bottom to top and a second passage in the shape of a "Z" are formed between the two partitions. A first outlet is provided at the top of the sedimentation chamber and above the second passage. The first outlet and the coagulation chamber are connected by a first water outlet pipe. The coagulation chamber is located below the sedimentation chamber. An agitator with an output shaft located inside the coagulation chamber is provided on the main body of the device. A flocculant injection channel communicating with the coagulation chamber is provided on the main body of the device. The water flow mechanism is located directly above the agitator. The filtration chamber is located directly below the coagulation chamber. The water flow mechanism includes a wave-shaped water pipe, with its inlet end connected to the coagulation chamber and its outlet end connected to the filtration chamber. The water pipe has several upward-curved transition pipe sections, and between any two transition pipe sections there is a downward-curved sinking pipe section. The transition pipe section and the sinking pipe section each have a first curve midpoint located above and a second curve midpoint located below. The height of the first curve midpoint of the sinking pipe section is lower than the height of the second curve midpoint of the transition pipe section. The input end of the water pipe is a transition pipe section and is the first curve midpoint. A first opening extending vertically downwards is formed at the midpoint of the second bend of each of the submerged pipe sections. A baffle is hinged to the first opening to block it. A second torsion spring is provided between the baffle and the submerged pipe section, and the second torsion spring causes the baffle to block the first opening.

2. The in-situ leaching soil remediation system as described in claim 1, characterized in that: The injection unit includes a main pipe with its input end connected to the output end of the cleaning fluid storage unit and an injection well vertically inserted into the vadose zone layer and connected to the main pipe at its top. The main pipe is evenly laid on the ground, and the injection wells are arranged in multiples and distributed at equal intervals.

3. The in-situ leaching soil remediation system as described in claim 2, characterized in that: The main tube includes a hollow outer tube and a hollow inner tube coaxially disposed within the outer tube. A first conveying cavity is formed between the inner wall of the outer tube and the outer wall of the inner tube, and a second conveying cavity is formed within the inner tube. The first and second conveying cavities are respectively connected to the output end of the cleaning fluid storage unit. A plurality of spray heads communicating with the first conveying cavity are equally spaced at the bottom of the outer tube to spray cleaning fluid onto the ground. The injection well is connected to the second conveying cavity.

4. The in-situ leaching soil remediation system as described in claim 1, characterized in that: An installation chamber is formed within the main body of the device and below the coagulation chamber, spaced apart by a first mounting plate. The stirring part includes a driving component disposed in the installation chamber and a stirring frame disposed on the output shaft of the driving component and located in the coagulation chamber. The output shaft of the driving component is sealed and rotates through the first mounting plate. The stirring frame includes a main rod connected to the output shaft of the driving component and vertically arranged, and a plurality of stirring rods extending radially from the main rod in a horizontal direction perpendicular to the main rod. An electric slip ring is provided on the first mounting plate. The output shaft of the drive unit is sealed and rotates through the electric slip ring. The flocculant injection channel includes a main channel formed in the first mounting plate and a sub-channel formed on the main rod. The input end of the sub-channel is connected to the main channel through the electric slip ring, and the output end is divided into several sub-channels that extend along the length of the stirring rod and penetrate each stirring rod.

5. The in-situ leaching soil remediation system as described in claim 4, characterized in that: The end of each stirring rod away from the main rod is bent in the horizontal direction in the opposite direction to the rotation direction of the stirring rod to form a curved segment.

6. The in-situ leaching soil remediation system as described in claim 5, characterized in that: Each of the curved segments has a curved port on the side away from the main pole that connects to the branch channel. A baffle that can block the curved port is hinged to the side of each curved port that is close to the main pole. A first torsion spring is provided between the baffle and the curved port so that the baffle blocks the curved port. The side of the baffle away from the main pole extends horizontally toward the side away from the main pole to form an extension end. A balloon filled with gas is connected to each extension end by a rope.

7. The in-situ leaching soil remediation system as described in claim 6, characterized in that: The stirring rack is positioned with the uppermost stirring rod close to the water flow mechanism.

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