Sludge in-situ solidification treatment method in river regulation construction

Abstract

This invention discloses a method for in-situ solidification of sludge during river remediation construction. The method utilizes an in-situ solidification device for sludge in river remediation construction to solidify the sludge in situ. The device includes a main shaft connected to a motor, a stirring device mounted on the main shaft, and a spraying component at the bottom of the main shaft's protective sleeve. The method includes: forming a spraying space deep into the sludge using an arrow-shaped structure that moves with the spraying component; and spraying a solidifying agent into the spraying space using the spraying component. The in-situ solidification method for sludge in river remediation construction provided by this invention utilizes the spraying space formed by the arrow-shaped structure attached to the stirring device, which moves with the main shaft to inject the solidifying agent. This allows the solidifying agent to reach and penetrate the sludge, resulting in a more efficient agent mixing effect for in-situ sludge treatment and improving the quality of in-situ solidification of sludge during river remediation construction.

Description

Technical Field

[0001] This invention relates to the field of river management technology, and in particular to a method for in-situ solidification treatment of sludge during river remediation construction. Background Technology

[0002] In modern river management projects, in-situ solidification of sludge is a crucial step. With the acceleration of industrialization and urbanization, river pollution has become increasingly severe. Large amounts of sludge containing pollutants such as heavy metals and organic matter accumulate at the bottom of river channels, affecting not only the flood control capacity of the rivers but also causing continuous damage to the aquatic ecological environment.

[0003] Traditional methods of river sludge treatment often require large-scale excavation, transportation, and off-site processing. This method is costly, prone to secondary pollution during transportation, and occupies a large amount of land resources. Therefore, in-situ solidification technology has emerged. It aims to transform sludge into a stable solid form by adding solidifying agents without moving the sludge, thereby reducing the leaching of harmful substances and improving the strength and stability of the sludge for further treatment or utilization.

[0004] The in-situ sludge solidification treatment device for river remediation construction disclosed in CN219259803U, while capable of solving the problem of off-site treatment after large-scale excavation and transportation, exhibits a significant issue in practical applications: the solidification agent struggles to quickly penetrate the sludge during mixing. Sludge typically possesses a complex composition and structure, containing particles of varying sizes, substantial amounts of water, and interwoven fibrous materials, resulting in a fine and irregular internal pore structure. When conventional mixing devices operate, relying solely on simple blade rotation and tumbling, the solidification agent remains largely on the sludge surface, failing to rapidly and uniformly penetrate deeper into the sludge. This results in a significant time commitment to prolong the mixing process, hoping for the agent to slowly diffuse inward. This not only greatly reduces construction efficiency, increases equipment energy consumption and labor costs, and prolongs the river remediation period, but also leads to uneven agent penetration and inconsistent solidification effects. Some areas of the treated sludge meet the strength standards, while others remain loose and prone to loss, failing to meet the project's requirements for the overall stability of the solidified sludge. Consequently, it is difficult to achieve the desired river remediation effect, and there remains a risk of environmental pollution in the future.

[0005] In conclusion, it is urgent to develop an in-situ solidification treatment method for sludge during river remediation construction that can effectively solve the problem of rapid penetration of solidification agents into the sludge during sludge mixing. Summary of the Invention

[0006] The purpose of this invention is to provide a method for in-situ solidification of sludge during river remediation construction. This method can improve the penetration effect of the agent on the sludge, allowing the agent to be sprayed directly to a deeper location, reducing the possibility of the agent being absorbed in large quantities on the sludge surface, and improving the construction quality of in-situ solidification of sludge.

[0007] This invention provides a method for in-situ solidification of sludge during river remediation construction. The method utilizes an in-situ solidification device for sludge in river remediation construction to perform in-situ solidification of the sludge. The device includes a main shaft connected to a motor, a stirring device mounted on the main shaft, and a spraying assembly at the bottom of the protective sleeve of the main shaft. The method includes:

[0008] An arrow-shaped structure that follows the movement of the spraying component creates a deep injection space into the sludge.

[0009] The solidifying agent is sprayed into the injection space using a spraying assembly;

[0010] The injection space is located behind the agitator blades and is formed by arrow-shaped sludge dividing plates and sludge supporting plates. As the agitator blades rotate, the injection space penetrates deeper into the sludge, allowing the agent to be sprayed directly to deeper areas, reducing the possibility of it being absorbed in large quantities on the surface. The sludge dividing plates divide the sludge, and the sludge supporting plates create the space. After the agent is sprayed, as the agitator blades continue to rotate, the surrounding sludge will backfill into the injection space and mix with the agent.

[0011] The method for in-situ solidification of sludge during river remediation construction provided by the present invention further includes using the rotating base plate of the spraying assembly to periodically oscillate and spray the sludge with chemicals. This periodic oscillation spraying achieves the effect of following the injection space for a certain distance to spray the chemical solution into the sludge, and then resetting to spray the chemical solution onto the sludge, thereby further increasing the mixing effect of the chemical and the sludge.

[0012] In the in-situ solidification treatment method for sludge during river remediation construction provided by the present invention, adjacent mixing blades of the mixing device are symmetrically arranged with mud-dividing plates, and the mud-dividing plates are provided with relatively distributed mud-supporting plates. The mud-dividing plates and mud-supporting plates form an arrow-shaped structure, and the arrow-shaped structure forms a chemical injection space. The mud-dividing plates and mud-supporting plates are distributed in a straight line along the height direction of the main axis, and the chemical spraying component is provided with chemical spray nozzles that cooperate with the chemical injection space.

[0013] Compared with the prior art, the in-situ solidification treatment method for sludge in river remediation construction provided by the present invention utilizes the injection space formed by the arrow-shaped structure attached to the mixing device to inject solidifying agent as the main shaft moves, so that the solidifying agent can reach the sludge protrusion (the depth of the arrow extension is the depth that the solidifying agent can reach), which brings a more efficient agent mixing effect to the in-situ treatment of sludge, thereby improving the quality of in-situ solidification treatment of sludge in river remediation construction.

[0014] In the in-situ sludge solidification method for river remediation construction provided by this invention, the sludge separating plate is V-shaped. This pointed head structure not only improves the efficiency of sludge separation but, more importantly, minimizes resistance, thereby reducing the load and energy consumption of the main shaft motor. The sludge separating plate can be fixed in various ways, including but not limited to welding to the mixing blades, and it needs to extend beyond the edge of the mixing blades, with the extension length set as needed. The outward extension of the sludge separating plate at the edge of the mixing blades minimizes obstruction of the vertical injection space by the mixing blades.

[0015] In the in-situ sludge solidification method for river remediation construction provided by this invention, the sludge support plate and the rotating direction of the mixing blades are tangential. This better achieves smooth rotation while reducing corresponding resistance.

[0016] In the in-situ solidification treatment method for sludge during river remediation construction provided by this invention, the spraying assembly has a spraying shell, which is a bottom-opening structure composed of a circular top and annular enclosures distributed around the edge of the circular top. Multiple sets of inlet pipes are distributed in annular array on the circular top of the spraying shell. A rotating base plate that can rotate horizontally inside the spraying shell is movably installed at the opening of the spraying shell. Multiple sets of chemical nozzles that cooperate with the inlet pipes are distributed in annular array on the rotating base plate. Each set of chemical nozzles and inlet pipes are connected by a flexible telescopic connecting pipe. The chemical nozzles are located directly above the injection space. The rotating base plate can rotate with the rotation of the main shaft.

[0017] In the in-situ sludge solidification treatment method for river remediation construction provided by the present invention, multiple sets of sliding grooves are paired on the lower surface of the circular top of the spraying shell and the upper surface of the rotating base plate. The sliding grooves are inclinedly distributed, and a sliding rod that can slide along the sliding groove is movably installed between the two sets of upper and lower corresponding sliding grooves. A return spring is provided between the end of the sliding rod and the end of the sliding groove. A sliding rod actuating plate that cooperates with the sliding rod is radially installed on the side wall of the main shaft corresponding to the position of the sliding rod. The distance between the far end of the sliding groove and the center of the main shaft is the same as the sum of the length of the sliding rod actuating plate and the diameter of the sliding rod.

[0018] In the in-situ solidification treatment method for sludge during river remediation construction provided by the present invention, the cross-section of the chute is narrow at the top and wide at the bottom, and anti-detachment plates that fit into the chute are respectively provided at both ends of the chute.

[0019] In the in-situ solidification treatment method for sludge during river remediation construction provided by the present invention, one end of the chute where the reset spring is installed is flat, and a stabilizing block is integrally formed at the same horizontal height position of the slide rod corresponding to the reset spring, with the end of the stabilizing block near the reset spring being flat. Attached Figure Description

[0020] Figure 1This is a three-dimensional diagram of an in-situ sludge solidification treatment device used in river remediation construction.

[0021] Figure 2 A top view of the mixing device in an in-situ sludge solidification treatment apparatus used in river remediation construction, as part of a method for in-situ sludge solidification treatment during river remediation construction.

[0022] Figure 3 A three-dimensional diagram of the spraying component of a sludge in-situ solidification treatment device used in river remediation construction, as part of the sludge in-situ solidification treatment method for river remediation construction.

[0023] Figure 4 A top view of the spraying component of a sludge in-situ solidification treatment device used in river remediation construction, as part of the sludge in-situ solidification treatment method for river remediation construction. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific embodiments.

[0025] The present invention provides a method for in-situ solidification of sludge during river remediation construction (hereinafter referred to as "the method"). The method utilizes an in-situ solidification device for sludge in river remediation construction to perform in-situ solidification treatment on sludge. The in-situ solidification device for sludge in river remediation construction has a main shaft connected to a motor and a stirring device installed on the main shaft. A spraying component is provided at the bottom of the protective sleeve of the main shaft. The method includes forming a spraying space deep into the sludge using an arrow-shaped structure that follows the movement of the spraying component, and spraying solidifying agent into the spraying space using the spraying component. At the same time, the method can also use the rotating base plate of the spraying component to periodically swing and spray the sludge with the agent. This periodic swinging spraying achieves the effect of following the spraying space for a certain distance to spray the agent into the sludge, and then resetting to spray the agent onto the sludge, further increasing the mixing effect of the agent and the sludge.

[0026] Before describing the method in detail, this paper introduces the in-situ solidification treatment device for sludge used in river remediation construction. This in-situ solidification treatment device for sludge used in river remediation construction (hereinafter referred to as "the device") can be found in [link to relevant documentation]. Figure 1-3 As shown, the device includes a main shaft 1, stirring blades 2, mud-dividing plate 3, mud-supporting plate 4, injection space 5, protective sleeve 6, spraying shell 7, inlet pipe 8, rotating base plate 9, spray nozzle 10, flexible telescopic connecting pipe 11, chute 12, sliding rod 13, return spring 14, actuating plate 15, anti-detachment plate 16, and stabilizing block 17, wherein the stirring blades 2 are part of the stirring device 18.

[0027] See Figure 1The main shaft 1 of the device is connected to a drive motor (not shown in the figure), which drives the main shaft to rotate. Multiple sets of stirring devices 18 are installed at the lower part of the main shaft 1 to agitate the sludge. Each set of stirring devices has six stirring blades 2. In this embodiment, two sets of stirring devices 18 are arranged along the height of the main shaft, which can be adjusted as needed. After the stirring blades 2 are inserted into the sludge, the external motor drives the main shaft 1 to rotate, using the stirring blades 2 to agitate the sludge and better mix the sludge with the solidification agent. It is worth mentioning that sludge-dividing plates 3 and sludge-supporting plates 4 are installed on the stirring blades. The arrow-shaped structure formed by the sludge-dividing plates 3 and sludge-supporting plates 4 allows the solidification agent to reach the interior of the sludge effectively, changing the problem that traditional agent application mostly only reaches the surface of the sludge. The mud-dividing plates 3 are symmetrically arranged between adjacent mixing blades. The mud-dividing plates 3 and the mud-supporting plates 4 are distributed in a straight line along the height direction of the main shaft. This linear distribution facilitates the delivery of the drug to the deepest parts of the sludge with the shortest possible stroke. The mud-dividing plates can be welded and fixed to the mixing blades. To cut through the sludge and reduce the load on the motor, the mud-dividing plates 3 adopt a V-shaped structure. The V-shaped tip easily cuts through the sludge and moves synchronously with the mixing blades. The mud-supporting plates 4 are distributed opposite each other on the inner side of the mud-dividing plates 3. This effectively utilizes the mud-dividing plates 3 and 4 to form the drug injection space 5. Figure 1 and Figure 2 It can be seen that since the mud-distributing plate 3 is a long strip-shaped component distributed along the height direction of the main shaft, its height is roughly the same as the height of the main shaft at the bottom of the spraying assembly.

[0028] In this embodiment, two sets of stirring devices are used. The stirring devices at the same horizontal height have six blades, corresponding to three pairs of mud-dividing plates and their matching mud-supporting plates 4. This arrow-shaped structure is symmetrically distributed, and the arrow-shaped structures of adjacent stirring blades back to back form multiple paths for the solidification agent to penetrate deep into the sludge for delivery.

[0029] It is worth mentioning that in this embodiment, the mud-supporting plate 4 is tangent to the rotation direction of the stirring blade 2, so that the mud-separating plate 3 and the mud-supporting plate 4 form an arrow-shaped structure. The two adjacent sets of mud-supporting plates 4 form a chemical injection space 5. When the stirring blade 2 stirs the sludge, the mud-separating plate 3 separates the sludge, and the mud-supporting plate 4 supports the sludge, so that the sludge forms a space at the chemical injection space 5. At this time, the solidifying agent is directly sprayed into the sludge cavity at the chemical injection space 5 and mixed into the depth of the sludge. After rotation, the sludge merges and mixes the agent into the sludge at different layers, increasing the solidification effect.

[0030] In this embodiment, the sludge-dividing plate has a V-shaped cross-section, which efficiently cuts apart the sludge when the agitator blades rotate. The sludge-supporting plate supports the cut sludge, thus forming a stable injection space. This dynamic cutting and supporting process effectively reduces sludge accumulation on the opening side of the injection space. The rotating base plate in the spraying assembly rotates with the main shaft, ensuring that the spray nozzle is always directly above the injection space. As the agitator blades continuously stir to form new injection spaces, the nozzles can promptly spray the agent into the newly formed space, reducing the possibility of sludge blockage due to a stationary space. The injection space is located behind the agitator blades and is formed by the sludge-dividing plate and the sludge-supporting plate. When the agitator blades rotate, the injection space continuously penetrates deeper into the sludge, allowing the agent to be sprayed directly to deeper areas, reducing the possibility of excessive absorption on the surface. The sludge-dividing plate cuts apart the sludge, and the sludge-supporting plate creates the space. After the agent is sprayed, as the agitator blades continue to rotate, the surrounding sludge will backfill into the injection space and mix with the agent. This process of cutting, spraying, and backfilling allows the agent to mix thoroughly with the surrounding sludge in a short time, reducing the possibility of excessive absorption of the agent during its downward movement. This structural design relies on a single direction of rotation to ensure that the sludge separating and supporting plates can effectively cut and support the sludge, forming a stable injection space; therefore, it operates according to a specific direction of rotation.

[0031] In this embodiment, the main shaft is provided with a protective sleeve 6, and the bottom of the protective sleeve 6 is provided with a spraying assembly. The spraying assembly has a spraying housing 7, which has a circular top and an annular side enclosure distributed along the edge of the circular top. A rotating base plate 9 that can rotate horizontally inside the spraying housing 7 is movably installed in the bottom open portion of the spraying housing 7. The inner center hole of the rotating base plate 9 allows the main shaft to pass through the rotating base plate 9. Multiple sets of inlet pipes 8 are evenly distributed at intervals on the circular top of the spraying housing. For example, in this embodiment, six sets of inlet pipes are distributed in a circular array on the circular top of the spraying housing. Multiple sets of liquid spray nozzles 9 that cooperate with the inlet pipes are evenly distributed at intervals on the rotating base plate 9. The liquid spray nozzles 9 are located directly above the injection space 5 to facilitate spraying external liquid medicine into the injection space 5. Each set of liquid spray nozzles and inlet pipes are connected by a flexible telescopic connecting pipe 11, which includes, but is not limited to, a corrugated pipe. In this way, the rotating base plate 9 can rotate along with the main shaft, allowing the mixing blade 2 and the mud separating plate 3 to spray the medicine through the sludge holes during the mixing process that forms the injection space 5.

[0032] The lower surface of the circular top of the spraying casing and the top of the rotating base plate 9 are provided with paired sliding grooves 12 to facilitate the sliding of the sliding rod 13. See [reference needed]. Figure 3-4As shown, the slides 12 are inclined on their respective distribution surfaces. Taking the rotating base plate 9 as an example, the angle between the central axis O2 of the slide 12 and the vertical central axis O1 of the rotating base plate 9 is α, where α is an acute angle, for example, 36°. The slides 12 on the rotating base plate 9 are arranged in a circular array around the center of the rotating base plate. A sliding rod 13 is movably installed between the two pairs of slides 12 that correspond to each other. The end of the sliding rod 13 is fixedly connected to the end of the slide 12 through a return spring 14, so that the sliding rod 13 can overcome the tension of the return spring and move along the slide under the action of external force. After the external force disappears, it is reset along the slide 12 by the tension of the return spring. A deflector plate 15 is radially arranged on the side wall of the main shaft 1 corresponding to the position of the slide rod 13. In this embodiment, three deflector plates are distributed accordingly. The distance T2 between the far end of the slide groove 12 and the center of the main shaft is the same as the sum of the length T2 of the deflector plate and the diameter D of the slide rod (T2 = T2 + D). Thus, after the wave rod 15 pushes the slide rod 13 to the far end of the slide groove 12, the deflector plate 15 can pass over the slide rod 13 and continue to move forward. The slide rod is reset by the tension of the return spring 14 and waits for the next push of the deflector plate 15. In this process, the deflector plate 15 indirectly drives the rotating base plate 9 to rotate by pushing the slide rod 13 and the cooperation of the return spring 14, and forms a periodic swing. This achieves the effect of following the injection space 5 for a distance to spray the medicine into the sludge, and then resetting to spray the medicine onto the sludge, further enhancing the mixing effect of the medicine and the sludge.

[0033] It is worth mentioning that the cross-section of the slide groove 12 is narrow at the top and wide at the bottom. Anti-detachment plates 16 that fit into the slide groove are provided at both ends of the slide rod 13, preventing the slide rod 13 from detaching from the slide groove 12 and thus supporting the spraying housing 7 and the rotating base plate 9. The end of the slide groove where the return spring is installed is flat. A stabilizing block 17 is integrally formed at the same horizontal height as the return spring on the slide rod 13. The end of the stabilizing block 17 closest to the return spring is also flat. These two flat surfaces facilitate the installation of the return spring, and the stabilizing block also restricts the rotation of the slide rod 13 within the slide groove, preventing the return spring from getting tangled on the slide rod 13 and damaging it.

[0034] During construction, the drive motor rotates the main shaft 1, and the liquid pump pumps the liquid to the inlet pipe 8. The rotation of the main shaft 1 drives the stirring blade 2 to rotate, which causes the mud-dividing plate 3 welded on the stirring blade 2 to cut the sludge along the rotation direction of the stirring blade 2. Then, the mud is opened up by the mud-supporting plate 4, and finally, the injection space 5 (i.e., the injection space formed by the arrow-shaped structure) is formed behind the mud-supporting plate 4. The sludge is cut into a space here. At this time, the solidifying agent is sprayed from the inlet pipe 8 through the corrugated pipe and then from the liquid nozzle 10 into the sludge space, sprinkling the solidifying agent deep into the sludge and increasing the mixing effect of the agent.

[0035] Simultaneously, the rotating main shaft 1 drives the actuating plate 15 to rotate within the spraying housing 7. When the actuating plate 15 comes into contact with the sliding rod 13, it squeezes the sliding rod 13, causing the sliding rod 13 to pull the return spring 14. The return spring 14 pulls the rotating base plate 9, which in turn drives the chemical spray nozzle 10 on the rotating base plate 9 to follow the injection space 5 formed after being stirred by the stirring blade 2, so that the solidified agent is sprayed. When the actuating plate 15 further pushes the sliding rod 13, the sliding rod 13 moves to the farthest end of the chute 12. At this time, the sliding rod 13 passes over the actuating plate 15 and is pulled back by the return spring 14. At the same time, the rotating base plate 9 resets within the spraying housing 7, driving the chemical spray nozzle 10 to reset, spraying the liquid onto the uncut sludge, so that the solidified agent is mixed from top to bottom, further increasing the mixing effect of the agent.

[0036] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A method for in-situ solidification of sludge during river remediation construction, comprising a sludge in-situ solidification device for river remediation construction, the sludge in-situ solidification device having a main shaft connected to a motor, a stirring device mounted on the main shaft, and a spraying component provided at the bottom of the protective sleeve of the main shaft, characterized in that... The method includes: An arrow-shaped structure that follows the movement of the spraying component creates a deep injection space into the sludge. The solidifying agent is sprayed into the injection space using a spraying assembly; The injection space is located behind the mixing blades and is formed by the arrow-shaped mud-dividing plate and mud-supporting plate at the mixing device. When the mixing blades rotate, the agent in the injection space continuously penetrates into the sludge with the movement of the mixing blades, so that the agent can be directly sprayed to a deeper position, reducing the possibility of the agent being absorbed in large quantities on the surface of the sludge. The mixing device has symmetrical mud-dividing plates arranged on adjacent mixing blades. The mud-dividing plates are provided with relatively distributed mud-supporting plates. The mud-dividing plates and mud-supporting plates form an arrow-shaped structure. The arrow-shaped structure forms a chemical injection space. The mud-dividing plates and mud-supporting plates are distributed in a straight line along the height direction of the main shaft. The chemical spraying component is provided with a chemical spray nozzle that cooperates with the chemical injection space. The spraying assembly has a spraying shell, which is a bottom-opening structure composed of a circular top and annular enclosures distributed around the edge of the circular top. The circular top of the spraying shell has multiple sets of inlet pipes arranged in annular array. A rotating base plate that can rotate horizontally inside the spraying shell is movably installed at the opening of the spraying shell. The rotating base plate has multiple sets of spray nozzles that cooperate with the inlet pipes arranged in annular array. Each set of spray nozzles and inlet pipes is connected by a flexible telescopic connecting pipe. The spray nozzles are located directly above the spraying space. The rotating base plate can rotate with the rotation of the main shaft. The lower surface of the circular top of the spraying shell and the upper surface of the rotating base plate are provided with multiple sets of sliding grooves. The sliding grooves are inclined. A sliding rod that can slide along the sliding groove is movably installed between the two sets of upper and lower corresponding sliding grooves. A return spring is provided between the end of the sliding rod and the end of the sliding groove. A sliding rod actuating plate that cooperates with the sliding rod is radially installed on the side wall of the main shaft corresponding to the position of the sliding rod. The distance between the far end of the sliding groove and the center of the main shaft is the same as the sum of the length of the sliding rod actuating plate and the diameter of the sliding rod. The mud support plate is tangential to the rotation direction of the stirring blade.

2. The method for in-situ solidification treatment of sludge during river regulation construction according to claim 1, characterized in that, The method further includes: The sludge is periodically sprayed with chemicals using the rotating base plate assembly of the spraying unit.

3. The method for in-situ solidification treatment of sludge during river regulation construction according to claim 1, characterized in that, The mud-dividing plate is V-shaped.

4. The method for in-situ solidification treatment of sludge during river regulation construction according to claim 1, characterized in that, The cross-section of the chute is narrow at the top and wide at the bottom, and anti-detachment plates that fit into the chute are respectively provided at both ends of the slide rod.

5. The method for in-situ solidification treatment of sludge during river regulation construction according to claim 1, characterized in that, The end of the slide groove where the reset spring is installed is flat, and the slide rod is integrally formed with a stabilizing block at the same horizontal height as the reset spring. The end of the stabilizing block near the reset spring is flat.

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