Titanium dioxide production wastewater treatment sedimentation tank

Abstract

The present application relates to the technical field of separation using chemical and physical methods, and specifically discloses a titanium dioxide production wastewater treatment sedimentation tank, which includes a sedimentation tank body, a sediment accumulation area arranged at the sedimentation end and lower than the bottom of the sedimentation tank, and a sediment discharge pipeline system for discharging sediments in the sediment accumulation area; the sediment discharge pipeline system includes a sewage main pipe, a bypass branch arranged on the sewage main pipe, a slow flow structure arranged at the water inlet end of the sewage main pipe, and a disturbing flow structure connected to the bypass branch, and one end of the sewage main pipe is connected to a power pump. The purpose of setting the slow flow structure at the water inlet end of the sewage main pipe is to slow down the time for sludge to enter the sewage main pipe through its cooperation with the bypass branch, and the purpose of setting the disturbing flow structure is to disturb the sludge in the sediment accumulation area before the sludge enters the sewage main pipe after the power pump is started, so as to increase the amount of water mixed in the sludge, increase the fluidity of the sludge, and avoid blockage caused by the sludge entering the sewage main pipe.

Description

Technical Field

[0001] The invention relates to the technical field of separation using chemical and physical methods, and in particular to a feeding or discharging device for a sedimentation tank. Background Art

[0002] The main pollutants in the titanium dioxide acid wastewater are H2SO4 and FeSO4, which are reacted with Ca(OH)2 emulsion to generate CaSO4 precipitate and Fe(OH)2. In actual production, the iron in the wastewater is removed by oxidizing Fe(OH)2 to Fe(OH)3 precipitate through aeration, mainly because: the solubility product of Fe3+ is lower than that of Fe2+; the concentration and dehydration of Fe(OH)2 sludge are more difficult than those of Fe(OH)3. At a pH of 5.5, the solubility of Fe(OH)3 is the lowest; when aeration is performed at a pH of 7 to 7.5, Fe2+ can be quickly converted into Fe3+, which is conducive to the deposition of Fe3+.

[0003] During the sewage sedimentation process, due to the high viscosity of CaSO4, another main component in the sewage, a large amount of CaSO4 precipitates during the treatment process, causing a large amount of sludge to clump and scale on the surface of the structure and in the sludge pipe. In view of this, the titanium dioxide production sewage sedimentation tank uses a horizontal flow sedimentation tank, which has good sedimentation effect, strong adaptability to impact loads, simple construction and low cost.

[0004] The horizontal flow sedimentation tank uses a traveling scraper to scrape the sludge settled at the bottom of the sedimentation tank, thereby effectively removing scale; the traveling scraper scrapes and pushes the sediment from the end of the sedimentation tank to the front end, and the sediment will eventually be concentrated in the sediment accumulation area at the front end of the sedimentation tank, and the sediment will be extracted from the bottom of the sediment accumulation area through the pipeline. Since the sediment is extracted from the bottom of the accumulation area, when the thickness of the sediment accumulated in the accumulation area is high, the density of the sediment accumulation at the bottom is relatively high, and because CaSO4 has a high viscosity, the sediment entering the pipeline has a high viscosity and a slow flow rate, so it is easy to scale on the inner wall of the pipeline or block the pipeline, thereby increasing the maintenance cost of the pipeline. Summary of the invention

[0005] The purpose of the present invention is to provide a titanium dioxide production wastewater treatment sedimentation tank to solve the problem that the density of sediment accumulation at the bottom is high, CaSO4 has high viscosity, the sediment flows slowly into the pipeline, and is easy to scale on the inner wall of the pipeline or block the pipeline.

[0006] The titanium dioxide production wastewater treatment sedimentation tank includes a sedimentation tank body, a sediment accumulation area located at the end of the sedimentation tank body and below the bottom of the sedimentation tank, and a sediment discharge pipeline system for discharging sediments in the sediment accumulation area;

[0007] The sediment discharge pipeline system includes a sewage main pipe, a bypass branch pipe arranged on the sewage main pipe, a slow flow structure arranged at the water inlet end of the sewage main pipe, and a disturbing flow structure connected to the bypass branch pipe; the water inlet end of the sewage main pipe is arranged as a venturi tube structure, the bypass branch pipe is connected to the throat of the venturi tube structure, the sewage main pipe is connected to the power pump and water is taken in from the inlet section of the venturi tube structure;

[0008] The slow flow structure includes a slidable flow block disposed in the inlet section of the venturi tube structure. The flow block is pushed toward the end under the action of a spring to close the inlet section. The flow block moves toward the throat to open the inlet section.

[0009] The spoiler structure includes a power cylinder and a spoiler assembly. A piston is slidably connected inside the power cylinder. The piston separates the upper part of the power cylinder to form a power chamber. A bypass branch pipe is connected to the power chamber and a water inlet hole with a diameter smaller than that of the bypass branch pipe is provided on the power chamber. The spoiler assembly includes a spoiler plate and a connecting rod whose two ends are respectively hinged to the piston and one end of the spoiler plate, and the other end of the spoiler plate is hinged to the water inlet end of the sewage main pipe.

[0010] The beneficial effects of this solution are:

[0011] After the sludge settled at the bottom of the sedimentation tank is scraped off by a traveling scraper, the sludge will be concentrated and settled in the sediment accumulation area. After a certain period of time, the sludge will be completely settled in the sediment accumulation area. At this time, the sediment discharge pipeline system can be started to discharge the accumulated sediment. Since the sediment after the treatment of titanium dioxide production wastewater contains a large amount of CaSO 4 precipitation, and due to the precipitation of CaSO 4 High density and high viscosity make it easy to form scale in the pipeline and cause pipeline blockage. (1) In the above technical solution, when the power pump is not started, the flow block is pushed away from the throat of the Venturi tube structure and the end of the sewage pipe is closed, so that the sludge cannot enter the sewage pipe through the end of the sewage pipe; as the power pump is started, negative pressure will be formed in the sewage pipe, and because the bypass branch directly connects the throat of the Venturi tube, the fluid will first enter the sewage pipe through the bypass branch. The diameter of the water inlet hole on the power chamber is smaller than the bypass branch, which will cause negative pressure to form in the power chamber, causing the piston in the power cylinder to move upward, and the piston, connecting rod and spoiler form a crank slider mechanism, and the upward movement of the piston will cause the spoiler to swing. Since the spoiler is arranged at the water inlet end of the sewage main, before the water enters the sewage main, the spoiler will disturb the sludge around the water inlet end of the sewage main, reduce its mixing ratio with water, reduce its density, increase the fluidity of the sludge, and avoid the sludge entering the sewage main with too high a density, blocking the sewage main and accelerating the structure.

[0012] (2) As the power pump continues to operate, due to the limited flow rate of the bypass branch, the pressure in the inlet section of the Venturi tube structure will continue to decrease and overcome the thrust of the spring on the baffle block. The baffle block moves toward the throat of the Venturi tube structure and connects the water inlet end of the sewage main pipe, and the sludge will enter through the water inlet end of the sewage main pipe. Since the flow rate at the water inlet end of the sewage main pipe is several times larger than the flow rate of the bypass branch, the flow rate in the bypass branch will be relatively reduced. When the fluid flows in the Venturi tube structure, the pressure in its throat will decrease. At this time, the fluid formed in the bypass branch is mainly sucked in through the pressure drop in the throat. The fluid in the bypass branch is relatively clean water with very little mud compared to the sludge. After entering the throat, it has the effect of flushing and diluting the sludge. Secondly, when the fluid enters the diffusion section of the Venturi tube structure from the throat, it will form a jet dispersion effect, thereby reducing the viscosity of the sludge and further avoiding blockage and scaling.

[0013] (3) As the sewage main pipe is opened, the flow rate of the bypass branch pipe will decrease, and the flow rates of the bypass branch pipe and the water inlet hole of the power chamber will reach a balance, and the piston will be less affected by the flow rate of the bypass branch pipe. However, at this time, a fluid is formed near the water inlet end of the sewage main pipe, and the flowing fluid will form a certain vibration effect on the spoiler, and also have a certain spoiling effect, so as to promote the mixing of sludge and the surrounding water body, and have the effect of reducing the sludge density.

[0014] Preferred solution 1: As a further optimization of the basic solution, a ring step for limiting the baffle is provided on the side wall between the throat of the venturi tube and the baffle, the baffle is a butterfly valve structure composed of a butterfly plate and a ring body, the butterfly plate is rotatably connected in the ring body through a rotating shaft, the ring body is divided into an upper half ring and a lower half ring by the rotating shaft of the butterfly plate, the upper half ring and the lower half ring are provided with blocks for limiting the butterfly plate and located on both sides of the butterfly plate, a torsion spring is installed on the rotating shaft of the butterfly plate to make the butterfly plate fit the block, the block is made of a magnet, and the butterfly plate is made of a magnetic conductive material;

[0015] The ring body is provided with an installation groove for installing a limit hook, and the middle part of the limit hook is rotatably connected to the side wall of the installation groove through a rotating shaft to form a lever structure. The limit hook is provided with a first hook at one end facing the butterfly plate, and a second hook is provided at the other end of the limit hook. A groove cooperating with the first hook is provided on the side wall of the butterfly plate, and a wedge surface is provided on the side wall of the butterfly plate in the direction of opening the butterfly plate; a limit groove opposite to the second hook is provided on the step surface of the ring step, and a convex edge cooperating with the second hook is provided on the side wall of the limit groove away from the center of the ring step, and a wedge surface is provided on the side of the second hook facing the ring step, and a torsion spring is provided on the rotating shaft of the limit hook to make the first hook and the second hook move toward the groove and the convex edge respectively.

[0016] In the preferred solution 1, under the action of the torsion spring, the first hook of the limit hook is embedded in the groove of the side wall of the butterfly plate, which has a locking effect on the butterfly plate; at the same time, the stopper has a limiting effect on the butterfly plate, so that the butterfly plate can only rotate to one side to open the baffle. As the baffle moves toward the ring step, when the baffle matches the step surface of the ring step, the second hook of the limit hook will enter the limit groove, and the convex edge in the limit groove will abut against the wedge surface of the second hook, which will press the second hook to make the first hook disengage from the groove. When disengaging, under the action of the negative pressure on the left side of the butterfly plate and the water pressure on the right side, the magnetic attraction of the butterfly plate and the stopper will be overcome, so that the butterfly plate rotates, and the water inlet end of the sewage main is connected.

[0017] When the power pump stops working, the second hook cooperates with the convex edge, and the flow block cannot return to its position temporarily under the action of the spring; at this time, under the action of the torsion spring, the butterfly plate is reset, and under the action of the magnetic attraction of the block, the butterfly plate squeezes the wedge surface of the first hook to make the first hook embedded in the groove on the edge of the butterfly plate. In this process, the second hook is separated from the convex edge, and under the action of the spring, the flow block is separated from the ring step and moves to the end of the water inlet end of the sewage main pipe; after the power pump stops working, the flow block can close the water inlet end of the sewage main pipe again. The butterfly valve structure composed of the ring body and the butterfly plate can form a larger channel after the butterfly plate is opened, which is conducive to the discharge of sludge.

[0018] Preferred solution 2: As a further optimization of preferred solution 1, two limit hooks are symmetrically arranged along the rotation axis of the butterfly plate. The symmetrical limit hooks form a more stable limit effect on the butterfly plate and the ring body.

[0019] Preferred solution three: As a further optimization of preferred solution two, the spoiler is provided with a plurality of strip holes whose length direction is along the axis direction of the sewage main pipe. The provision of strip holes can enhance the spoiler's disturbing effect on the sludge and prevent the sludge from agglomerating.

[0020] Preferred solution four: As a further optimization of preferred solution three, the power cylinder is arranged above the sediment accumulation area; this is conducive to replenishing clean water into the power cylinder and reducing the amount of impurities sucked into the bypass branch pipe.

[0021] Preferred solution five: As a further optimization of preferred solution four, the inner wall of the ring body and the outer periphery of the butterfly plate are configured as mutually matching spherical surfaces to enhance the sealing performance of the butterfly plate and the ring body.

[0022] Preferred Option Six: As a further optimization of Preferred Option Five, the annular step is provided with two-level step surfaces, the limit groove is provided on the first-level step surface close to the side wall of the sewage main pipe, and the spring providing thrust for the baffle block is provided between the second-level step surface and the baffle block; thereby facilitating the layout of the installation space of the limit hook, the limit groove and the spring, and reducing the space occupied inside the sewage main pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A magnified view of part A;

[0025] Figure 3 It is a partial view of the cooperation between the ring step and the ring body of the spoiler in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following is further described in detail through specific implementation methods:

[0027] The figure marks in the drawings of the specification include: sedimentation tank 10, sediment accumulation area 11, sewage main 20, venturi tube structure 30, diffusion section 31, throat 32, inlet section 33, bypass branch 41, annular step 51, limiting groove 511, ring body 52, block 521, butterfly plate 53, limiting hook 54, second hook 541, first hook 542, compression spring 55, spoiler structure 60, power cylinder 61, piston 62, water inlet hole 63, connecting rod 64, spoiler 65, strip hole 651, power chamber 66.

[0028] Embodiment 1:

[0029] like Figure 1 As shown, the titanium dioxide production wastewater treatment sedimentation tank includes a sedimentation tank 10 body, a sediment accumulation area located at the end of the sedimentation tank 10 and lower than the bottom of the sedimentation tank 10, and a sediment discharge pipeline system for discharging the sediment in the sediment accumulation area. In this embodiment, the sedimentation tank 10 body is arranged below the ground level, so that the traveling scraper can travel above the sedimentation tank 10 to scrape the sediment at the bottom of the sedimentation tank 10 and push it into the sediment accumulation area; the sediment accumulation area is arranged at the end of the sedimentation tank 10, and the bottom of the sediment accumulation area is connected to the bottom of the sedimentation tank 10 body through a guide slope, and when the traveling scraper scrapes the sediment from the other side of the sedimentation tank 10 to one side of the sediment accumulation area, the guide slope will facilitate the sediment to slide into the sediment accumulation area.

[0030] After the sediment at the bottom of the sedimentation tank 10 is scraped off, the sediment discharge pipeline system can be started to discharge the sediment at the bottom of the sediment accumulation area after standing for a period of time. In this embodiment, the sediment discharge pipeline system includes a sewage discharge main pipe 20, a bypass branch pipe 41 arranged on the sewage discharge main pipe 20, a slow flow structure arranged at the water inlet end of the sewage discharge main pipe 20, and a flow disturbance structure 60 connected to the bypass branch pipe 41. One end of the sewage discharge main pipe 20 is connected to a power pump, and the power pump adopts an external water pump. The water inlet end of the other end of the sewage discharge main pipe 20 extends to the sediment accumulation area so that the sediment sludge in the sediment accumulation area can be extracted. Secondly, the power pump is installed at the ground level to process the extracted sediment; in the sewage discharge process, in order to avoid residual sludge in the sewage discharge main pipe 20, the power pump can be turned off after the power pump discharges the clean water. Therefore, the sewage discharge main pipe 20 should be set as short as possible, so as to avoid storing too much clean water in the sewage discharge main pipe 20, which cannot be recycled.

[0031] The purpose of setting a slow flow structure at the water inlet end of the sewage main pipe 20 is to slow down the time for sludge to enter the sewage main pipe 20 through its cooperation with the bypass branch pipe 41. That is, when the power pump is started, a negative pressure will be formed in the sewage main pipe 20. In the process of gradually reducing the negative pressure in the sewage main pipe 20, the slow flow structure will make the water inlet end of the sewage main pipe 20 temporarily closed. At this time, the sewage main pipe 20 can only take in water through the bypass branch pipe 41. Therefore, a large flow rate will also be formed in the bypass branch pipe 41. In this embodiment, the inner diameter of the sewage main pipe 20 is set to 7 times the inner diameter of the bypass branch pipe 41, and the inner diameter of the throat is 5 times the inner diameter of the bypass branch pipe 41.

[0032] The purpose of providing the flow disturbance structure 60 is to disturb the sludge deposited in the sediment accumulation area before entering the sewage main pipe 20 after the power pump is started, so as to increase the amount of water mixed in the sludge, reduce the sludge density, and increase the sludge fluidity, so as to avoid the sludge from entering the sewage main pipe 20 and causing blockage and adhering to the side wall of the pipe to form scale.

[0033] like Figure 1As shown, the spoiler structure 60 includes a power cylinder 61 and a spoiler assembly. The power cylinder 61 is arranged in the clean water area above the sediment accumulation area. A piston 62 is slidably connected inside the power cylinder 61. The piston 62 separates the upper part of the power cylinder 61 to form a power chamber 66. The bypass branch pipe 41 is connected to the power chamber 66 and a water inlet hole 63 with a diameter smaller than that of the bypass branch pipe 41 is provided at the top of the power chamber 66. In the present embodiment, the diameter of the water inlet hole 63 is 2 / 3 of the inner diameter of the bypass branch pipe 41. Secondly, a retaining ring is provided on the lower side wall of the power cylinder 61 below the piston 62, and a tension spring is provided between the retaining ring and the piston 62; at the initial stage of starting the power pump, a large flow will be formed in the bypass branch pipe 41, but the diameter of the water inlet hole 63 is small, and it is impossible to supply water to the power chamber 66 in time to achieve the flow balance between the bypass branch pipe 41 and the water inlet hole 63, so a negative pressure will be formed in the power chamber 66, the piston 62 moves upward, and under the action of the tension spring, the piston 62 vibrates in the power cylinder 61. The spoiler assembly includes a spoiler 65 and a connecting rod 64 whose two ends are respectively hinged to the piston 62 and one end of the spoiler 65, and the other end of the spoiler 65 is hinged to the water inlet end of the sewage main pipe 20, so that the piston 62, the connecting rod 64 and the spoiler 65 form a crank slider mechanism, so that in the process of the piston 62 sliding up and down, the spoiler 65 will swing up and down, thereby disturbing the sludge. Secondly, in order to enhance the disturbance effect, a plurality of strip-shaped holes 651 are provided on the spoiler 65 , the length direction of which is parallel to the axial direction of the water inlet end of the sewage pipe 20 .

[0034] like Figure 2 , Figure 3 As shown, in this embodiment, the slow flow structure includes a flow block arranged at the water inlet end of the sewage main pipe 20 and a ring step 51 fixed to the side wall of the water inlet end of the sewage main pipe 20, wherein the flow block is close to the end of the water inlet end. The flow block is a butterfly valve structure composed of a butterfly plate 53 and a ring body 52. ​​The mating surface of the butterfly plate 53 and the ring body 52 is a spherical surface to enhance the sealing performance. The ring body 52 is slidably connected to the side wall of the water inlet end. In order to prevent the ring body 52 from rotating relative to the water inlet end, the side wall of the water inlet end and the ring body 52 are provided with mutually matching ridges and grooves. The butterfly plate 53 is rotatably connected in the ring body 52 through a rotating shaft. The ring body 52 is divided into an upper half ring and a lower half ring by the rotating shaft of the butterfly plate 53. The upper half ring and the lower half ring are provided with stoppers 521 for limiting the butterfly plate 53 and located on the left and right of the butterfly plate 53, wherein the stopper 521 of the upper half ring is arranged on the right side, and the stopper 521 of the lower half ring is arranged on the left side. A torsion spring is installed on the rotating shaft of the butterfly plate 53 to make the butterfly plate 53 fit the stopper 521. The stopper 521 is made of a magnet and the butterfly plate 53 is made of cast iron; thus, the stopper 521 can magnetically attract the butterfly plate 53. In addition, in order to avoid pressure balance between the upper and lower parts of the butterfly plate 53, the area of ​​the stopper 521 on the lower half ring is larger than the area of ​​the stopper ring 521 on the upper half ring.

[0035] The ring body 52 is provided with an installation groove for installing the limit hook 54. The middle part of the limit hook 54 is rotatably connected to the side wall of the installation groove through a rotating shaft to form a lever structure, and two limit hooks 54 are symmetrically provided along the rotating shaft of the butterfly plate 53. The limit hook 54 is provided with a first hook portion 542 at the right end facing the butterfly plate 53, and a second hook portion 541 at the left end of the limit hook 54. A groove matching the first hook portion 542 is provided on the side wall of the butterfly plate 53. The first hook portion 542 is provided on the side facing the direction of opening the butterfly plate 53 (as shown in the attached figure). Figure 3 The wedge surface of the first hook portion 542 of the upper limiting hook 54 faces the left side, and the other side surface of the first hook portion 542 is set as a vertical surface, so that after the first hook portion 542 is embedded in the groove, the butterfly plate 53 will not be able to open. The second hook portion 541 extends out of the ring body 52, and a limiting groove 511 opposite to the second hook portion 541 is provided on the step surface of the ring step 51. The side wall of the limiting groove 511 is away from the center of the ring step 51 (such as the attached Figure 3 In the embodiment, a convex edge is provided on the top wall of the upper limiting groove 511) and a convex edge is provided to cooperate with the second hook 541. The left side of the second hook 541 is set as a wedge surface, and the right side of the second hook 541 can cooperate with the convex edge, and the cooperation surface is a vertical surface, that is, after the second hook 541 cooperates with the convex edge, the second hook 541 will not be able to actively disengage from the convex edge. The rotating shaft of the limiting hook 54 is provided with a torsion spring that makes the first hook 542 and the second hook 541 move toward the groove and the convex edge respectively, so that the limiting hook 54 has a reset function.

[0036] The ring step 51 is provided with two-level steps, the limiting groove 511 is provided on the first-level step close to the side wall of the sewage pipe 20, and a compression spring 55 is provided between the second-level step of the ring step 51 and the ring body 52. ​​After the power pump is started, negative pressure will be formed in the sewage pipe. As the negative pressure gradually decreases, the ring body 52 will move toward the ring step 51, and the second hook 541 will enter the limiting groove 511. The convex edge in the limiting groove 511 presses the wedge surface of the second hook 541, which will lift the first hook 542, and the first hook 542 will be out of engagement with the groove. Therefore, the butterfly plate 53 can be opened only by overcoming the magnetic attraction of the stopper 521 and the butterfly plate 53, that is, in this embodiment, the butterfly plate 53 is opened under the negative pressure on the left side of the butterfly plate 53 and the water pressure on the right side. When the power pump stops, the butterfly plate 53 is reset under the action of the torsion spring. After the butterfly plate 53 approaches the stopper 521, the magnetic attraction force increases, and the butterfly plate 53 squeezes the wedge surface of the first hook 542 to separate the second hook 541 from the convex edge. Then, under the action of the compression spring 55, the ring body 52 is reset to block the water inlet end.

[0037] like Figure 1As shown, the water inlet end of the sewage main pipe 20 is set as a venturi tube structure 30, wherein the bypass branch pipe 41 is connected to the throat 32 of the venturi tube structure 30, and the baffle is set in the inlet section 33 of the venturi tube structure 30; and the diffuser section 31 of the venturi tube structure 30 faces one end of the power pump. By setting the venturi tube structure 30, after the venturi tube structure 30 is connected, the sludge enters the throat 32 of the venturi tube structure 30, and the negative pressure of the throat 32 will suck clean water through the bypass branch pipe 41, thereby further reducing the sludge density; secondly, after entering the diffuser section 31, the dispersion effect formed by the jet has the effect of dispersing the sludge to prevent the sludge from clogging the pipeline.

[0038] After the sewage discharge main pipe 20 is opened, a relatively fast fluid will be formed near the spoiler 65, and the tension spring under the piston 62 will make the spoiler 65 vibrate, thereby forming a disturbing effect on the sediment during the sewage discharge process.

[0039] Embodiment 2:

[0040] The difference between Example 2 and Example 1 is that in Example 2, the baffle block composed of a ring body and a butterfly plate is replaced by a valve core similar to a sliding valve, and the water inlet end of the sewage main pipe and the valve core form a sliding valve structure; the negative pressure formed in the sewage main pipe pushes the valve core to slide, and the sliding valve structure can be turned on. After the power pump stops, the sliding valve is reset under the action of the compression spring.

[0041] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A sedimentation tank for treating wastewater produced by titanium dioxide, comprising a sedimentation tank body, a sedimentation accumulation area arranged at the end of the sedimentation tank body and lower than the bottom of the sedimentation tank, and a sediment discharge pipe system for discharging sediments in the sedimentation accumulation area, characterized in that: The sediment discharge pipeline system includes a sewage main pipe, a bypass branch pipe arranged on the sewage main pipe, a slow flow structure arranged at the water inlet end of the sewage main pipe, and a disturbing flow structure connected to the bypass branch pipe; the water inlet end of the sewage main pipe is arranged as a venturi tube structure, the bypass branch pipe is connected to the throat of the venturi tube structure, the sewage main pipe is connected to the power pump and water is taken in from the inlet section of the venturi tube structure; The slow flow structure includes a slidable flow block disposed in the inlet section of the venturi tube structure. The flow block is pushed toward the end under the action of a spring to close the inlet section. The flow block moves toward the throat to open the inlet section. The spoiler structure includes a power cylinder and a spoiler assembly, a piston is slidably connected in the power cylinder, the piston separates the upper part of the power cylinder to form a power chamber, the bypass branch is connected to the power chamber and the power chamber is provided with a water inlet hole with a diameter smaller than the bypass branch; the spoiler assembly includes a spoiler and a connecting rod hinged to the piston and one end of the spoiler at both ends, and the other end of the spoiler is hinged to the water inlet end of the sewage main pipe; a ring step for limiting the spoiler is provided on the side wall between the throat of the venturi tube and the spoiler, and the spoiler is a butterfly valve structure composed of a butterfly plate and a ring body, the butterfly plate is rotatably connected in the ring body through a rotating shaft, and the ring body is divided into an upper half ring and a lower half ring by the rotating shaft of the butterfly plate, the upper half ring and the lower half ring are provided with blocks for limiting the butterfly plate and located on both sides of the butterfly plate, and a torsion spring is installed on the rotating shaft of the butterfly plate to make the butterfly plate fit the block, the block is made of a magnet, and the butterfly plate is made of a magnetic conductive material; The ring body is provided with an installation groove for installing a limit hook, and the middle part of the limit hook is rotatably connected to the side wall of the installation groove through a rotating shaft to form a lever structure, and a first hook is provided at one end of the limit hook facing the butterfly plate, and a second hook is provided at the other end of the limit hook, and a groove cooperating with the first hook is provided on the side wall of the butterfly plate, and a wedge surface is provided on the side of the first hook facing the direction of opening the butterfly plate; a limit groove opposite to the second hook is provided on the step surface of the ring step, and a convex edge cooperating with the second hook is provided on the side wall of the limit groove away from the center of the ring step, and a wedge surface is provided on the side of the second hook facing the ring step, and a torsion spring is provided on the rotating shaft of the limit hook to make the first hook and the second hook move toward the groove and the convex edge respectively; the ring step is provided with two-level step surfaces, and the limit groove is provided on the first-level step surface close to the side wall of the sewage main pipe, and a spring providing thrust for the baffle block is provided between the second-level step surface and the baffle block.

2. The titanium dioxide production wastewater treatment sedimentation tank according to claim 1, characterized in that: Two limit hooks are symmetrically arranged along the rotating axis of the butterfly plate.

3. The titanium dioxide production wastewater treatment sedimentation tank according to claim 2, characterized in that: The spoiler is provided with a plurality of strip-shaped holes whose length direction is along the axis direction of the sewage main pipe.

4. The titanium dioxide production wastewater treatment sedimentation tank according to claim 3, characterized in that: The power cylinder is arranged above the sediment accumulation area.

5. The titanium dioxide production wastewater treatment sedimentation tank according to claim 4, characterized in that: The inner wall of the ring body and the outer periphery of the butterfly plate are arranged as spherical surfaces which fit each other.

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