Biochemical sludge thickening tank

Abstract

The utility model provides a biochemical sludge thickening tank which comprises a tank body provided with a cavity with an upward opening, and the bottom of the tank body is provided with a sludge discharge port communicated with the cavity; the water outlet structure is connected with the outer side wall surface of the pool body and forms a water outlet groove with an upward opening with the side wall surface of the pool body; the mud blocking structure comprises a first mud blocking plate and a second mud blocking plate, the first mud blocking plate is connected with the inner side wall face of the pond body, the first mud blocking plate and the inner side wall face of the pond body form a mud blocking groove with an upward opening, the bottom face of the mud blocking groove is provided with a sedimentation opening communicated with the cavity, and the second mud blocking plate is connected with the inner wall face of the mud blocking groove and divides the mud blocking groove into an inner ring groove and an outer ring groove; the upper end of the second fender is higher than the upper end of the first fender, the upper end of the first fender is higher than or equal to the upper end of the side wall face of the pool body, a circulation opening is formed between the lower end of the second fender and the lower wall face of the mud blocking groove, and the inner annular groove and the outer annular groove are communicated through the circulation opening. The utility model can solve the problem that clods are mixed into supernatant and discharged, and improves the feeding concentration of the dehydrator.

Description

Technical Field

[0001] The utility model relates to the technical field of biochemical sludge treatment, in particular to a biochemical sludge thickening tank. Background Art

[0002] High-ammonia-nitrogen organic wastewater usually needs to be treated by a biochemical system to remove pollutants such as COD and ammonia nitrogen in the water. The moisture content of the excess sludge generated by the biochemical system usually reaches more than 98%, and it cannot directly enter a dehydrator (screw press or belt filter press) for filtration. Usually, a sludge thickening tank is required for sedimentation and thickening to increase the solid content of the sludge, thereby improving the dehydration efficiency of the dehydrator.

[0003] Since the biochemical sludge contains nitrate nitrogen, after the sludge is discharged into the sludge thickening tank, anaerobic denitrification occurs in the tank, generating nitrogen gas to cause the sludge to float in lumps. Among them, the phenomenon of sludge floating is particularly serious in the high-temperature season in summer. The floating of the sludge will affect the mud-water stratification in the sludge thickening tank, resulting in an increase in the turbidity of the supernatant in the thickening tank. When treating the supernatant, it is necessary to increase the consumption of polyacrylamide (PAM) agents used to adsorb suspended particles in the water. Moreover, the floating of the sludge will cause less sludge at the bottom of the thickening tank, a decrease in the feed concentration of the dehydrator, a reduction in the working efficiency of the dehydrator, and even affect the normal operation of the dehydrator, resulting in thin materials. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a biochemical sludge thickening tank.

[0005] The solution for the utility model to solve its technical problems is as follows:

[0006] A biochemical sludge thickening tank, comprising:

[0007] A tank body, the tank body is provided with a cavity with an upward opening, and a sludge discharge port is arranged at the bottom of the tank body, and the sludge discharge port is communicated with the cavity;

[0008] An effluent structure, the effluent structure is connected to the outer side wall surface of the tank body and jointly forms an effluent trough with the side wall surface of the tank body, and the opening of the effluent trough is arranged upward;

[0009] The mud guard structure includes a first mud guard and a second mud guard. The first mud guard is connected to the inner wall surface of the tank body and jointly forms a mud guard groove with an upward opening with the inner wall surface of the tank body. A sedimentation port is provided at the bottom surface of the mud guard groove, and the sedimentation port is communicated with the cavity. The second mud guard is connected to the inner wall surface of the mud guard groove and divides the mud guard groove into an inner ring groove and an outer ring groove. The upper end of the second mud guard is higher than the upper end of the first mud guard. The upper end of the first mud guard is higher than or equal to the upper end of the side wall of the tank body. A circulation port is formed between the lower end of the second mud guard and the lower wall surface of the mud guard groove. The inner ring groove and the outer ring groove are communicated through the circulation port.

[0010] The utility model has at least the following beneficial effects: During the use of the biochemical sludge thickening tank, the cavity maintains a full liquid level state. The supernatant liquid with sludge in the cavity enters the inner ring groove of the mud guard groove through the upper end of the first mud guard. The sludge is blocked by the second mud guard and precipitates to the bottom of the mud guard groove, is discharged from the mud guard groove through the sedimentation port, and sinks to the bottom of the cavity and is discharged to the dehydrator through the sludge discharge port. The supernatant liquid without sludge enters the outer ring groove through the circulation port at the lower end of the second mud guard and passes over the side wall of the tank body and enters the water outlet tank. Due to the setting of the mud guard structure, the sludge in the supernatant liquid does not directly pass over the side wall of the tank body and enter the water outlet tank. Instead, under the blocking action of the second mud guard, it sinks to the bottom of the mud guard groove and is discharged through the sedimentation port, and finally precipitates to the bottom of the cavity. The supernatant liquid flowing out to the water outlet tank has a low sludge concentration, which can reduce the consumption of chemicals for treating the supernatant liquid. Moreover, more sludge sinks to the bottom of the tank body and enters the dehydrator, which can increase the feeding concentration of the dehydrator, maintain the normal operation of the dehydrator, and improve the working efficiency of the dehydrator.

[0011] As a further improvement of the above technical solution, the lower wall surface of the mud guard groove is inclined downward in the direction towards the sedimentation port. With this setting, the sludge blocked by the second mud guard can slide along the lower wall surface of the mud guard groove to the sedimentation port and leave the mud guard groove, avoiding the accumulation of floating mud in the mud guard groove, thereby avoiding the situation that the sludge at the bottom of the tank body becomes less and the feeding concentration of the dehydrator decreases.

[0012] As a further improvement of the above technical solution, the sedimentation port is arranged between the first mud guard and the inner wall surface of the tank body, and the lower wall surface of the mud guard groove is inclined downward from the middle of the tank body towards the side wall surface of the tank body. With this setting, the sludge discharged from the mud guard groove through the sedimentation port can sink along the inner wall surface of the tank body and is not easily re-floated during the sinking process, which is beneficial to the free settlement of sludge debris to the sedimentation port.

[0013] As a further improvement of the above technical solution, the biochemical sludge thickening tank further includes:

[0014] Flushing structure, including a water pipe and a nozzle. The water pipe is connected to the upper end of the tank body, the nozzle is connected to the water pipe, and the nozzle is arranged towards the cavity.

[0015] The nozzle can spray flushing water into the cavity. The flushing water can break up the floating sludge and disperse nitrogen gas, causing the sludge to sink, enabling more sludge to sink to the bottom of the tank body and enter the dehydrator, further increasing the feed concentration of the dehydrator.

[0016] As a further improvement of the above technical solution, multiple groups of the flushing structures are provided, and the multiple groups of flushing structures are circumferentially and evenly arranged around the central axis of the tank body. Setting multiple groups of flushing structures can evenly break up the floating sludge in the upper part of the cavity and improve the effect of breaking up the floating sludge.

[0017] As a further improvement of the above technical solution, the water pipe extends radially outward along the tank body, the nozzle is perpendicular to the water pipe, and the angle between the nozzle and the horizontal plane is an acute angle. With this setting, when the nozzle sprays flushing water into the cavity, the flushing water of multiple groups of flushing structures sprays the sludge in the cavity and jointly forms a resultant force, causing the supernatant liquid with floating sludge in the upper part of the cavity to drift in a clockwise or counterclockwise direction, which is more conducive to breaking up all the floating sludge in the upper part of the cavity and allowing more floating sludge to sink back to the bottom of the cavity.

[0018] As a further improvement of the above technical solution, the biochemical sludge thickening tank further includes:

[0019] A draft tube, which is arranged in the cavity. The draft tube is hollow and provided with a draft channel. The lower end of the draft channel is communicated with the cavity, and the upper end of the draft tube is higher than the upper end of the first mud baffle.

[0020] Setting the draft tube can guide the sludge into the middle or even the lower part of the cavity, preventing the muddy water with sludge from directly flowing towards the mud retaining structure and causing short-circuiting, reducing the sludge concentration in the supernatant liquid entering the mud retaining structure, and improving the efficiency of sludge sedimentation.

[0021] As a further improvement of the above technical solution, the bottom surface of the tank body is inclined downward towards the sludge discharge port. With this setting, the efficiency of sludge sedimentation and discharge can be further improved, and the situation of sludge accumulation at the bottom of the cavity can be reduced.

[0022] As a further improvement of the above technical solution, the biochemical sludge thickening tank further includes:

[0023] A sludge scraper, which is provided with a sludge scraping plate. The sludge scraping plate is arranged in the cavity, rotates around the center of the sludge discharge port, and is movably connected to the bottom surface of the tank body.

[0024] A sludge scraper is provided, which can scrape the sludge on the bottom surface of the cavity towards the sludge discharge port. Even when the slope of the bottom surface of the tank body is set to be small, the accumulation of sludge at the bottom of the cavity can be avoided, enabling more sludge to be discharged through the sludge discharge port into the dehydrator, thereby increasing the feed concentration of the dehydrator.

[0025] As a further improvement of the above technical solution, the biochemical sludge thickening tank further includes:

[0026] A cover plate, which is connected to the upper end of the water outlet structure and covers the upper ends of the water outlet trough and the cavity. The cover plate is provided with a deodorizing air duct, and the deodorizing air duct is communicated with the cavity;

[0027] A deodorizing device, which is connected to the deodorizing air duct.

[0028] The arrangement of the cover plate and the deodorizing device can effectively prevent the odor gas from overflowing and reduce the impact on the surrounding environment during the sludge treatment process. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly describe the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, rather than all embodiments. Those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative efforts.

[0030] Figure 1 It is a schematic structural diagram of the biochemical sludge thickening tank according to the embodiment of the present invention;

[0031] Figure 2 is Figure 1 An enlarged structural diagram of part A in

[0032] Figure 3 It is a schematic layout diagram of the flushing structure of the biochemical sludge thickening tank according to the embodiment of the present invention.

[0033] Reference numerals: 100, tank body; 110, cavity; 120, sludge discharge port; 200, water outlet structure; 210, water outlet trough; 300, mud retaining structure; 310, first mud retaining plate; 311, first plate body; 312, second plate body; 320, second mud retaining plate; 330, mud retaining trough; 331, inner ring trough; 332, outer ring trough; 340, sedimentation port; 400, flushing structure; 410, spray head; 420, water pipe; 500, sludge scraper; 510, sludge scraping plate; 600, draft tube; 610, draft channel; 700, deodorizing device; 800, dehydrator; 900, cover plate; 910, deodorizing air duct. Detailed Embodiments

[0034] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having like or similar functions throughout. The embodiments described by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation of the present utility model.

[0035] In the description of the present utility model, when it comes to orientation descriptions, such as the orientations or positional relationships indicated by up, down, front, back, left, right, etc., they are based on the orientations or positional relationships shown in the accompanying drawings. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present utility model.

[0036] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more. Understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0037] In the description of the present utility model, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0038] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model. Each technical feature in the present utility model can be combined interactively on the premise of not conflicting with each other.

[0039] Referring to Figures 1 to 3 , an embodiment of the present utility model provides a biochemical sludge thickening tank, which can solve the problem that sludge blocks float up and mix into the supernatant and are discharged in the existing sludge thickening tank, reduce the consumption of chemicals in the supernatant treatment process, ensure the feeding concentration of the dehydrator 800, improve the working efficiency of the dehydrator 800, and keep the dehydrator 800 running normally.

[0040] In this embodiment, the biochemical sludge thickening tank includes a tank body 100 and an effluent structure 200. The tank body 100 is provided with a cavity 110 in the middle. The cavity 110 is open upward. A sludge discharge port 120 is provided at the bottom of the tank body 100. The sludge discharge port 120 is communicated with the cavity 110. When the sludge and water enter the cavity 110, the sludge can settle to the bottom of the cavity 110 and can be discharged through the sludge discharge port 120 at the bottom of the tank body 100 into a dehydrator 800 for pressure filtration. Moreover, when the sludge settles to the bottom of the cavity 110, the sludge and water will be stratified. The upper part of the sludge is supernatant liquid, and the supernatant liquid can overflow from the upper end of the side wall surface of the tank body 100 to the outside of the tank body 100. The effluent structure 200 is arranged outside the tank body 100 and is connected to the outer side wall surface of the tank body 100. The effluent structure 200 and the side wall surface of the tank body 100 together form an effluent trough 210. The effluent trough 210 is used to store the supernatant liquid and is open upward.

[0041] It can be understood that during the use process, the cavity 110 remains in a full-liquid state. The side wall surface of the tank body 100 between the effluent trough 210 and the cavity 110 forms an effluent weir. The supernatant liquid in the cavity 110 can flow over the upper end of the effluent weir into the effluent trough 210.

[0042] It should be noted that the biochemical sludge thickening tank of this embodiment further includes a mud retaining structure 300. The mud retaining structure 300 is arranged in the cavity 110. The mud retaining structure 300 includes a first mud retaining plate 310 and a second mud retaining plate 320. The first mud retaining plate 310 is connected to the inner side wall surface of the tank body 100. Moreover, the inner side wall surface of the tank body 100 and the first mud retaining plate 310 together form a mud retaining trough 330. The mud retaining trough 330 is open upward. A precipitation port 340 is provided at the bottom surface of the mud retaining trough 330. The precipitation port 340 allows floating mud to pass through. The precipitation port 340 is communicated with the cavity 110. The second mud retaining plate 320 is installed in the mud retaining trough 330 and extends upward beyond the upper opening of the mud retaining trough 330. The second mud retaining plate 320 divides the mud retaining trough 330 into two parts, an inner ring trough 331 and an outer ring trough 332. The upper end of the second mud retaining plate 320 is higher than the upper end of the first mud retaining plate 310. The upper end of the first mud retaining plate 310 is not lower than the upper end of the side wall surface of the tank body 100. A communication port is formed between the lower end of the second mud retaining plate 320 and the lower wall surface of the mud retaining trough 330. The inner ring trough 331 and the outer ring trough 332 are communicated with each other through this communication port.

[0043] It can be understood that the second mud retaining plate 320 is connected to the inner wall surface of the mud retaining trough 330. In this embodiment, the first mud retaining plate 310 and the second mud retaining plate 320 are respectively fixed to the inner side wall surface of the tank body 100 through brackets. The brackets have good corrosion resistance.

[0044] During use, the supernatant with floating sludge in the cavity 110 passes over the upper end of the first baffle 310 and enters the baffle trough 330, and is blocked by the second baffle 320. The floating sludge blocked by the second baffle 320 sinks to the lower part of the baffle trough 330, and is re-precipitated to the bottom of the cavity 110 through the precipitation port 340. The supernatant flows from the inner ring trough 331 to the outer ring trough 332 and flows to the water outlet trough 210 through the water outlet weir. Since the floating sludge is blocked by the baffle structure 300 during the process of the supernatant flowing out to the water outlet trough 210, the sludge concentration of the supernatant finally flowing into the water outlet trough 210 is low, which can reduce the chemical consumption for treating the supernatant. Moreover, more sludge sinks to the bottom of the tank body 100 and enters the dehydrator 800, which can increase the feeding concentration of the dehydrator 800, maintain the normal operation of the dehydrator 800, and improve the working efficiency of the dehydrator 800.

[0045] In some embodiments, in order to further improve the precipitation effect of the floating sludge, the lower wall surface of the baffle trough 330 is inclined downward towards the precipitation port 340. The sludge debris blocked by the second baffle 320 can slide along the lower wall surface of the baffle trough 330 to the precipitation port 340, avoiding the accumulation of floating sludge in the baffle trough 330 and preventing the reduction of the sludge at the bottom of the tank body 100 and the decrease of the feeding concentration of the dehydrator 800.

[0046] In this embodiment, the precipitation port 340 is arranged between the first baffle 310 and the inner side wall surface of the tank body 100, and the lower wall surface of the baffle trough 330 is inclined downward from the middle of the tank body 100 to the outside. Such an arrangement is more conducive to the processing and installation of the first baffle 310. Specifically, the first baffle 310 includes a vertically arranged first plate body 311 and an inclined second plate body 312. Both the first plate body 311 and the second plate body 312 are arranged in the cavity 110. The upper end of the first plate body 311 is not lower than the upper end of the side wall surface of the tank body 100. The lower end of the first plate body 311 is connected to the upper end of the second plate body 312. The second plate body 312 is inclined downward from the first plate body 311 towards the side wall surface of the tank body 100. The lower end of the second plate body 312 is fixedly connected to the inner side wall surface of the tank body 100 through a bracket, and there is a gap between the second plate body 312 and the inner side wall surface of the tank body 100, and this gap is the precipitation port 340.

[0047] It can be understood that the lower wall surface of the baffle trough 330 maintains a relatively large slope. In this embodiment, the angle between the lower wall surface of the baffle trough 330 and the horizontal plane is not less than 60°. Such an arrangement is conducive to the free settlement of the sludge debris to the precipitation port 340 and the settlement to the bottom of the tank body 100, avoiding the formation of a dead zone between the baffle and the inner wall surface of the tank body 100 and the situation of sludge accumulation in the dead zone.

[0048] In this embodiment, the cross-section of the pool body 100 is circular. The first plate body 311 and the second mud baffle 320 are both circular ring baffles, and the cross-section of the mud baffle groove 330 is circular ring-shaped.

[0049] In some embodiments, the biochemical sludge thickening pool further includes a flushing structure 400. The flushing structure 400 is used to break up the massive sludge that has anaerobically floated up and make this sludge sink to the bottom of the cavity 110. Specifically, the flushing structure 400 includes a spray head 410 and a water pipe 420. The water pipe 420 is installed at the upper end of the pool body 100. The spray head 410 is connected to the water pipe 420, and the spray head 410 is arranged towards the cavity 110. It can be understood that the spray head 410 can spray flushing water into the cavity 110, and the flushing water can break up the floating sludge and make the sludge sink.

[0050] In some embodiments, multiple groups of flushing structures 400 are provided, and the multiple groups of flushing structures 400 are circumferentially and uniformly arranged around the central axis of the pool body 100. It can be understood that by providing multiple groups of flushing structures 400, the floating sludge in the upper part of the cavity 110 can be evenly broken up, improving the effect of breaking up the floating sludge.

[0051] In this embodiment, multiple spray heads 410 are provided in each group of flushing structures 400. It can be understood that the multiple spray heads 410 are arranged at a certain interval along the extending direction of the water pipe 420. The setting of the multiple spray heads 410 can more evenly break up the floating sludge in the upper part of the cavity 110, further improving the effect of breaking up and re-precipitating the floating sludge.

[0052] In some embodiments, the included angle formed between the spray head 410 and the horizontal plane is an acute angle, and moreover, the water pipe 420 extends outward from the center of the pool body 100, and the spray head 410 is perpendicular to the water pipe 420. With such a setting, when the spray head 410 sprays flushing water into the cavity 110, the flushing water of the multiple groups of flushing structures 400 sprays on the sludge in the cavity 110 and jointly forms a resultant force, making the supernatant liquid with floating sludge in the upper part of the cavity 110 drift in a clockwise or counterclockwise direction, which is more conducive to breaking up all the floating sludge in the upper part of the cavity 110 and making more floating sludge sink back to the bottom of the cavity 110.

[0053] In this embodiment, the included angle formed between the spray head 410 and the horizontal plane is 45°, which can effectively make the sludge in the cavity 110 rotate around the central axis of the pool body 100 and provide sufficient impact force on the sludge to break up the massive floating sludge.

[0054] In this embodiment, due to the special setting of the spray head 410, the sludge can be made to rotate around the central axis of the pool body 100. Therefore, by only setting two groups of flushing structures 400, the floating sludge at various positions in the cavity 110 can be broken up, reducing the number of components of the biochemical sludge thickening pool, thereby reducing the production and manufacturing cost of the biochemical sludge thickening pool.

[0055] It is understandable that the flushing structure 400 can be opened and closed manually or automatically. In this embodiment, the flushing structure 400 is opened or closed manually. A manual valve is provided at the water inlet end of the water pipe 420. When there is blocky floating sludge on the liquid level in the cavity 110, the valve can be manually opened to allow the nozzle 410 to discharge water and break up the floating sludge.

[0056] In some embodiments, the biochemical sludge thickening tank further includes a draft tube 600. The draft tube 600 is arranged in the cavity 110 and is hollow with a draft channel 610. The draft channel 610 is used to connect to the sludge discharge pipe of the biochemical system to guide the process of sludge entering the cavity 110. Its lower end is connected to the cavity 110, and the upper end of the draft tube 600 is arranged higher than the upper end of the first baffle 310.

[0057] Setting the draft tube 600 can guide the sludge into the middle or even the lower part of the cavity 110, so as to prevent the sludge from flowing directly to the weir and causing short circuit, reduce the sludge concentration in the supernatant, and improve the efficiency of sludge sedimentation.

[0058] In some embodiments, the lower end of the draft channel 610 opens towards the direction of the sludge discharge port 120, which can further improve the efficiency of sludge sedimentation and discharge.

[0059] In some embodiments, the bottom surface of the tank body 100 is inclined downward towards the sludge discharge port 120. The bottom surface of the tank body 100 with a certain slope can guide more sludge to be discharged through the sludge discharge port 120, improving the sludge discharge efficiency.

[0060] In this embodiment, the sludge discharge port 120 is arranged at the center position of the bottom surface of the tank body 100. The bottom surface of the tank body 100 is conical. The draft channel 610 is coaxially arranged with the tank body 100. The flushing structure 400 sprays water to the position of the cavity 110 between the draft tube 600 and the first baffle 310.

[0061] In order to save the civil engineering cost, the inclination slope of the bottom surface of the tank body 100 is small, and the precipitated sludge may adhere to the bottom surface of the tank body 100 and cannot flow to the sludge discharge port 120 by gravity. For this reason, in some embodiments, the biochemical sludge thickening tank further includes a sludge scraper 500. The sludge scraper 500 is provided with a sludge scraping plate 510. The sludge scraping plate 510 is arranged in the cavity 110. The sludge scraping plate 510 contacts the bottom surface of the tank body 100, and the sludge scraping plate 510 can rotate around the center of the sludge discharge port 120.

[0062] It can be understood that the sludge scraper 500 is provided with a rotary drive structure for driving the sludge scraper 510 to rotate. The rotary drive structure can be a motor or the like, and no specific limitation is made here. When the sludge scraper 510 rotates, the sludge scraper 510 can scrape the settled sludge on the bottom surface of the tank body 100 to the sludge discharge port 120 at the bottom of the tank, and timely send the sludge to the dehydrator 800 for pressure filtration.

[0063] When the concentration of the feed sludge of the dehydrator 800 decreases, the sludge scraper 500 can be started to scrape the sludge on the bottom surface of the tank body 100 to the sludge discharge port 120 of the tank body 100.

[0064] In this embodiment, the rotation axis of the sludge scraper 510 extends upward and extends out of the cavity 110. The rotary drive structure is arranged outside the cavity 110, and the guide cylinder 600 is sleeved outside the rotation axis.

[0065] In some embodiments, the biochemical sludge thickening tank further includes a cover plate 900 and a deodorization device 700. The cover plate 900 is connected to the upper end of the water outlet structure 200, and the cover plate 900 covers the upper ends of the water outlet tank 210 and the cavity 110. The cover plate 900 is provided with a deodorization air duct 910, and the deodorization air duct 910 is communicated with the cavity 110 and connected to the deodorization device 700. With such a setting, it can effectively prevent the odor gas from overflowing and not affect the surrounding environment.

[0066] In this embodiment, the deodorization device 700 is a volatile organic compound (VOC) deodorization device 700.

[0067] In some embodiments, the cover plate 900 is provided with an inspection opening that can be opened and closed. When the cover plate 900 covers the upper parts of the cavity 110 and the water outlet tank 210, the inspection opening is communicated with the cavity 110, and the operator can view the internal situation of the tank body 100 through the inspection opening.

[0068] When using the biochemical sludge thickening tank of this embodiment, the tank body 100 usually maintains a full liquid level state. Muddy water is added to the upper end of the guide cylinder 600 through the sludge discharge pipeline of the biochemical system, and the muddy water enters the cavity 110 along the guide cylinder 600. The sludge in the muddy water precipitates to the bottom of the cavity 110, causing the muddy water to be stratified. The sludge at the bottom of the tank body 100 is discharged through the sludge discharge port 120 to the dehydrator 800 for pressure filtration, while the upper part of the muddy water is the supernatant liquid, and the supernatant liquid flows out through the upper end of the tank body 100.

[0069] The lumpy sludge that has anaerobically floated up floats between the draft tube 600 and the mud baffle structure 300. When floating sludge appears in the supernatant liquid in the cavity 110, the flushing structure 400 is turned on, and the spray head 410 sprays water into the cavity 110. Under the power provided by the spray head 410, the supernatant liquid and the floating sludge in the cavity 110 drift in a clockwise or counterclockwise direction. When the flushing water sprayed by the spray head 410 contacts the floating sludge, the flushing water can break up the floating sludge. After the floating sludge is broken up by the flushing water, most of the sludge directly sinks to the bottom of the cavity 110, and a small part of the sludge enters the mud baffle structure 300 along with the supernatant liquid.

[0070] The supernatant liquid enters the mud baffle structure 300. First, it enters the inner ring groove 331 through the upper end of the first mud baffle 310. Then, it flows into the outer ring groove 332 from the lower end of the second mud baffle 320, and then flows to the water outlet weir formed by the side wall surface of the pool body 100 and reaches the water outlet trough 210. During this process, the second mud baffle 320 can block the sludge debris in the supernatant liquid to prevent the sludge debris from flowing out of the pool body 100 along with the supernatant liquid. The sludge debris blocked by the second mud baffle 320 sinks to the sedimentation port 340 of the mud baffle trough 330 and leaves the mud baffle trough 330 through the sedimentation port 340. The sludge debris slides down along the inner wall surface of the pool body 100 and re-settles to the bottom of the cavity 110. The supernatant liquid without sludge then undergoes a zigzag flow in the mud baffle trough 330, flows to the water outlet weir, and finally reaches the water outlet trough 210, and the turbidity of the supernatant liquid in the water outlet trough 210 decreases.

[0071] Since more sludge settles to the bottom of the cavity 110, the amount of sludge discharged to the dehydrator 800 through the sludge discharge port 120 is greatly increased, thereby increasing the feeding concentration of the dehydrator and improving the working efficiency of the dehydrator 800, and also ensuring the normal operation of the dehydrator 800. When the feeding sludge concentration of the dehydrator 800 decreases, the sludge scraper 500 is turned on, and the sludge scraper plate 510 scrapes the sludge at the bottom of the pool body 100 towards the sludge discharge port 120, allowing more sludge to be discharged to the dehydrator 800 through the sludge discharge port 120, increasing the feeding sludge concentration of the dehydrator 800, ensuring the normal operation of the dehydrator 800, and preventing the dehydrator 800 from discharging dilute materials.

[0072] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A biochemical sludge thickening tank, characterized in that: include: A tank body (100), wherein the tank body (100) is provided with a cavity (110) opening upward, and a mud discharge port (120) is provided at the bottom of the tank body (100), and the mud discharge port (120) is communicated with the cavity (110); a water outlet structure (200), the water outlet structure (200) being connected to the outer wall surface of the pool body (100), and forming a water outlet groove (210) together with the side wall surface of the pool body (100), wherein the opening of the water outlet groove (210) is arranged upward; The mud guard structure (300) comprises a first mud guard (310) and a second mud guard (320), wherein the first mud guard (310) is connected to the inner wall surface of the pool body (100) and together with the inner wall surface of the pool body (100) form a mud guard groove (330) opening upward, the bottom surface of the mud guard groove (330) is provided with a sedimentation port (340), and the sedimentation port (340) is communicated with the cavity (110), and the second mud guard (320) is connected to the inner wall surface of the mud guard groove (330). The mud guard groove (330) is connected to the second mud guard plate (320), and the mud guard groove (330) is divided into an inner ring groove (331) and an outer ring groove (332); the upper end of the second mud guard plate (320) is higher than the upper end of the first mud guard plate (310); the upper end of the first mud guard plate (310) is higher than or equal to the upper end of the side wall surface of the pool body (100); a flow opening is formed between the lower end of the second mud guard plate (320) and the lower wall surface of the mud guard groove (330); the inner ring groove (331) and the outer ring groove (332) are connected through the flow opening.

2. The biochemical sludge thickening tank according to claim 1, characterized in that: The lower wall surface of the mud retaining groove (330) is arranged to be inclined downward in the direction of the sedimentation port (340).

3. The biochemical sludge thickening tank according to claim 2, characterized in that: The sedimentation port (340) is disposed between the first mud guard plate (310) and the inner wall surface of the pool body (100), and the lower wall surface of the mud guard groove (330) is disposed obliquely downward from the middle of the pool body (100) toward the side wall surface of the pool body (100).

4. The biochemical sludge thickening tank according to claim 1, characterized in that: The biochemical sludge thickening tank also includes: The flushing structure (400) comprises a water pipe (420) and a spray head (410), wherein the water pipe (420) is connected to the upper end of the pool body (100), the spray head (410) is connected to the water pipe (420), and the spray head (410) is arranged toward the cavity (110).

5. The biochemical sludge thickening tank according to claim 4, characterized in that: The flushing structures (400) are provided in multiple groups, and the multiple groups of flushing structures (400) are evenly arranged around the circumference of the central axis of the pool body (100).

6. The biochemical sludge thickening tank according to claim 5, characterized in that: The water pipe (420) is arranged to extend outwardly along the radial direction of the pool body (100), the nozzle (410) is perpendicular to the water pipe (420), and the angle between the nozzle (410) and the horizontal plane is an acute angle.

7. The biochemical sludge thickening tank according to claim 1, characterized in that: The biochemical sludge thickening tank also includes: A guide tube (600), the guide tube (600) being arranged in the cavity (110), the guide tube (600) being hollow and provided with a guide channel, the lower end of the guide channel being in communication with the cavity (110), and the upper end of the guide tube (600) being higher than the upper end of the first fender (310).

8. The biochemical sludge thickening tank according to claim 1, characterized in that: The bottom surface of the pool body (100) is arranged to be inclined downward in the direction of the mud discharge port (120).

9. The biochemical sludge thickening tank according to claim 8, characterized in that: The biochemical sludge thickening tank also includes: A mud scraper (500) is provided with a mud scraper plate (510), wherein the mud scraper plate (510) is arranged in the cavity (110), the mud scraper plate (510) rotates around the center of the mud discharge port (120), and is movably connected to the bottom surface of the pool body (100).

10. The biochemical sludge thickening tank according to claim 1, characterized in that: The biochemical sludge thickening tank also includes: a cover plate (900), the cover plate (900) being connected to the upper end of the water outlet structure (200) and covering the water outlet groove (210) and the upper end of the cavity (110), the cover plate (900) being provided with a deodorizing air duct (910), and the deodorizing air duct (910) being in communication with the cavity (110); A deodorizing device (700), wherein the deodorizing device (700) is connected to the deodorizing air duct (910).

Images