An activated sludge screening device

Abstract

The utility model relates to a kind of activated sludge screening devices, including cyclone tank, the upper end side of cyclone tank is equipped with sludge input port, the top middle of cyclone tank is equipped with overflow port, overflow port is conducive to oil pollution foam and spiral upward overflow discharge of filamentous sludge, sludge output pipe is arranged in the axial direction in overflow port, the lower end of sludge output pipe extends to the middle lower part of cyclone tank, and the upper end of sludge output pipe is connected with sand pump;Inorganic sandy outlet is opened in the bottom of cyclone tank.Backflow sludge enters cyclone tank in tangent direction, backflow sludge spirally flows in cyclone tank, and the activated sludge with greater specific gravity and better settling performance flows downward along cyclone tank side wall, and high-quality activated sludge is pumped upward and away by sand pump and sludge output pipe, inorganic sandy is discharged to the inorganic sandy outlet in the bottom of cyclone tank, and oil pollution foam and filamentous sludge with lighter specific gravity spirally flow from bottom to top to overflow port and discharge, so as to realize the removal of light floating sludge and inorganic sand.

Description

Technical Field

[0001] This utility model relates to an activated sludge screening device. Background Technology

[0002] Activated sludge is like the "heart" of a wastewater treatment plant. It is a collective term for microbial communities and the organic and inorganic substances they depend on. Wastewater treatment utilizes the bio-coagulation, adsorption, and oxidation of activated sludge, and the metabolism of microorganisms to decompose and remove organic pollutants from wastewater.

[0003] During operation, especially after the effluent was upgraded, the settling performance of activated sludge deteriorated due to the influence of chemical sludge, resulting in poor sludge-water separation and affecting operational stability. Simultaneously, after long-term operation, inorganic sand accumulates in the wastewater treatment plant. This component lacks activity and cannot effectively remove pollutants, further increasing the energy consumption of the aeration tank blowers. Therefore, it is necessary to remove the light floating mud and inorganic sand from the sludge, hence this case. Utility Model Content

[0004] This invention addresses the problems existing in the prior art by providing an activated sludge screening device.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an activated sludge screening device, comprising a cyclone tank, wherein a sludge inlet is radially provided on the upper side of the cyclone tank to facilitate the input of refluxed sludge, and an overflow outlet is axially provided in the middle of the top of the cyclone tank to facilitate the spiral upward overflow and discharge of oily foam and filamentous sludge, and a sludge output pipe is axially inserted inside the overflow outlet, the lower end of the sludge output pipe extending to the lower middle part of the cyclone tank, and the upper end of the sludge output pipe being connected to the input end of a sand pump; and an inorganic sand outlet is provided at the bottom of the cyclone tank.

[0006] Furthermore, a swirling stirring shaft is axially inserted into the overflow port. The upper end of the swirling stirring shaft is connected to a stirring power component, which drives the swirling stirring shaft to rotate. A stirring blade is provided on the lower outer wall of the swirling stirring shaft.

[0007] Furthermore, the swirling stirring shaft has an internally hollow tubular structure, with both the top and bottom of the swirling stirring shaft being open; the sludge output pipe coaxially passes through the swirling stirring shaft.

[0008] Furthermore, an installation platform is provided directly above the cyclone pool, and the cyclone stirring shaft rotatably passes through the installation platform; the stirring power component includes a stirring motor, a driving pulley, a driven pulley, and a transmission belt. The stirring motor is mounted on the installation platform, and the output shaft of the stirring motor is connected to the driving pulley. The driven pulley is mounted on the outside of the cyclone stirring shaft, and the driven pulley is connected to the driving pulley through the transmission belt. The stirring motor drives the cyclone stirring shaft to rotate through the driving pulley, the transmission belt, and the driven pulley.

[0009] Furthermore, the sand pump is mounted on the installation platform.

[0010] Furthermore, the top of the overflow port is closed and the bottom is open, and the swirling stirring shaft passes through the top of the overflow port. The swirling stirring shaft is rotatably connected to the top of the overflow port through a bearing.

[0011] Furthermore, the upper end of the overflow port extends above the vortex pool, and an overflow discharge pipe is connected to the upper side wall of the overflow port, which is connected to the sludge thickening tank.

[0012] Furthermore, the output end of the sand pump is connected to the biological treatment tank via a pipeline.

[0013] Furthermore, the inorganic sand outlet is connected to the sludge thickening tank through an inorganic sand output pipe, and a control valve is installed at the end of the inorganic sand output pipe near the inorganic sand outlet.

[0014] Furthermore, the vortex tank includes an upper cylindrical section, a conical section, and a lower cylindrical section distributed sequentially from top to bottom. The sludge inlet is located on the upper side of the upper cylindrical section, and the overflow outlet is located at the top middle position of the upper cylindrical section. The inorganic sand outlet is located at the bottom of the lower cylindrical section, and the lower port of the sludge outlet pipe extends into the conical section.

[0015] Compared with the prior art, the present invention has the following advantages: The present invention has a reasonable structural design. The return sludge enters the vortex tank tangentially and flows spirally in the vortex tank. The activated sludge with a larger specific gravity and better settling performance flows downward along the side wall of the vortex tank. The high-quality activated sludge is pumped upward through the sand pump and sludge output pipe. The inorganic sand settles to the inorganic sand discharge port at the bottom of the vortex tank, while the lighter oil foam and filamentous sludge flow spirally upward to the overflow port for discharge. In this way, the light floating mud and inorganic sand are removed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front cross-sectional structure of an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the local structure in the diagram; Figure 3 This is a schematic diagram illustrating the operation of an embodiment of the present invention.

[0017] 1-Swirl chamber; 101-Upper cylindrical section; 102-Conical section; 103-Lower cylindrical section; 2-Sludge inlet; 3-Overflow outlet; 4-Sludge outlet pipe; 5-Sand pump; 6-Inorganic sand outlet; 7-Swirl mixing shaft; 8-Mixing blades; 9-Mounting platform; 10-Mixing motor; 11-Drive pulley; 12-Driven pulley; 13-Transmission belt; 14-Overflow outlet pipe; 15-Inner vortex; 16-Outer vortex. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figures 1-3 As shown, this utility model discloses an activated sludge screening device, comprising a vertically arranged cyclone tank 1. A sludge inlet 2 is radially provided on the upper side of the cyclone tank 1 to facilitate the input of return sludge. The return sludge enters the cyclone tank tangentially at a certain speed, and the mixed liquid undergoes spiral motion under the action of centrifugal force and the tank wall. An overflow port 3 is axially provided in the middle of the top of the cyclone tank 1, which facilitates the spiral upward overflow and discharge of oily foam and filamentous sludge (i.e., light floating sludge). A sludge output pipe 4 is axially inserted inside the overflow port 3, with its lower end extending to the lower middle part of the cyclone tank 1, and its upper end connected to the input end of a sand pump 5. An inorganic sand discharge port 6 is provided at the bottom of the cyclone tank 1. During operation, the return sludge enters the vortex tank 1 tangentially and flows spirally within the vortex tank 1. The activated sludge with a higher specific gravity and better settling performance flows downward along the side wall of the vortex tank 1. The high-quality activated sludge is pumped upward through the sand pump 5 and sludge discharge pipe 4. The inorganic sand settles to the inorganic sand discharge outlet 6 at the bottom of the vortex tank 1, while the lighter oil foam and filamentous sludge spiral flow upward to the overflow outlet for discharge. This process removes the light floating sludge and inorganic sand.

[0021] In this embodiment, a vortex stirring shaft 7 is axially inserted into the overflow port 3. The upper end of the vortex stirring shaft 7 is connected to a stirring power component, which drives the vortex stirring shaft 7 to rotate. A stirring blade 8 is provided on the lower outer wall of the vortex stirring shaft 7. During operation, the stirring power component drives the stirring blade 8 to rotate through the vortex stirring shaft 7, thereby forming a vortex inside the vortex pool 1. The mixed liquid undergoes a spiral motion under the action of centrifugal force and the pool wall after being stirred by the blades. That is, the vortex inside the vortex pool is achieved through the rotation of the stirring blades and the pool wall.

[0022] It should be noted that the swirling flow pattern formed in the swirling pool is the same as that of existing swirling agitators. An inner vortex is formed in the middle of the swirling pool, and an outer vortex is formed on the outside of the inner vortex. Materials with a smaller specific gravity are driven by the inner vortex to flow from bottom to top along the axial direction, while materials with a larger specific gravity are driven by the outer vortex to flow from top to bottom. These are all existing known technologies, and will not be repeated here.

[0023] In this embodiment, the swirl stirring shaft 7 has an internally hollow tubular structure, with both the top and bottom of the swirl stirring shaft 7 being open; the sludge output pipe 4 coaxially passes through the swirl stirring shaft 7, and there is a gap between the sludge output pipe and the inner wall of the swirl stirring shaft, that is, the sludge output pipe does not affect the normal rotation of the swirl stirring shaft.

[0024] In this embodiment, an installation platform 9 is provided directly above the vortex pool 1. The vortex stirring shaft 7 is rotatably mounted through the installation platform 9 via bearings, i.e., the vortex stirring shaft is mounted on the installation platform. The stirring power component includes a stirring motor 10, a driving pulley 11, a driven pulley 12, and a transmission belt 13. The stirring motor 10 is vertically mounted on the installation platform 9. The output shaft of the stirring motor 10 extends downward and is connected to the horizontally mounted driving pulley 11 (i.e., the axis of the driving pulley extends vertically). The driven pulley 12 is mounted on the outside of the vortex stirring shaft 7. The driven pulley 12 is connected to the driving pulley 11 via the transmission belt 13. The stirring motor 10 drives the vortex stirring shaft 7 to rotate through the driving pulley 11, the transmission belt 13, and the driven pulley 12.

[0025] In this embodiment, the sand pump 5 is installed on the installation platform 9, and the output end of the sand pump is connected to the biological treatment tank through a pipeline to return the extracted high-quality activated sludge to the biological treatment tank.

[0026] In this embodiment, the top of the overflow port 3 is closed and the bottom is open. The swirling stirring shaft 7 passes through the top of the overflow port 3 and is rotatably connected to the top of the overflow port 3 through a bearing.

[0027] In this embodiment, the upper end of the overflow port 3 extends above the vortex tank 1, and an overflow discharge pipe 14 is connected to the upper side wall of the overflow port 3. The overflow discharge pipe 14 is connected to the sludge thickening tank. The oily foam and filamentous sludge flowing out of the overflow port are discharged into the sludge thickening tank through the overflow discharge pipe.

[0028] In this embodiment, the inorganic sand discharge outlet 6 is connected to the sludge thickening tank via an inorganic sand output pipe (not shown in the figure). A control valve (not shown in the figure) is installed at one end of the inorganic sand output pipe near the inorganic sand discharge outlet 6. When the control valve is opened, the inorganic sand at the bottom of the vortex tank is discharged from the inorganic sand discharge outlet and then discharged into the sludge thickening tank via the inorganic sand output pipe. It should be noted that the control valve can be opened once every 3-5 hours, and each time it only needs to be opened for a few minutes.

[0029] In this embodiment, the vortex tank 1 includes an upper cylindrical section 101, a conical section 102, and a lower cylindrical section 103 distributed sequentially from top to bottom. The sludge inlet 2 is located on the upper side of the upper cylindrical section 101, and the overflow outlet 3 is located at the top middle position of the upper cylindrical section 101. The inorganic sand outlet 6 is located in the middle of the lower cylindrical section 103. The lower port of the sludge outlet pipe 4 extends into the conical section 102. For example, the distance between the lower port of the sludge outlet pipe and the bottom of the vortex tank is about 1 / 5 of the height of the vortex tank. The specific distance can be adjusted during actual use to minimize the removal of inorganic sand.

[0030] Working principle: The return sludge enters the vortex tank tangentially at a certain speed. After being stirred by the impeller, the mixed liquor undergoes a spiral motion under the action of centrifugal force and the tank wall. The heavier the part, the greater the centrifugal force it experiences. Thus, the heavier activated sludge with better settling properties is thrown against the vortex tank wall and rotates downwards along the tank wall. The sand pump extracts the high-quality activated sludge to the biological treatment tank through the sludge output pipe. Inorganic sand settles at the bottom of the vortex tank. When the control valve is opened, the inorganic sand is discharged to the sludge thickening tank. The lighter oily foam and filamentous sludge tend to move along the axial direction, forming an upward rotational motion, and flows out from the overflow port. Finally, it is discharged into the sludge thickening tank through the overflow discharge pipe, thereby removing light floating sludge and inorganic sand.

[0031] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0032] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0033] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An activated sludge screening device, characterized in that: The system includes a cyclone pool, with a sludge inlet radially opened on the upper side to facilitate the input of sludge return. An overflow port axially opened in the middle of the top of the cyclone pool to facilitate the spiral upward overflow and discharge of oily foam and filamentous sludge. A sludge output pipe axially passes through the overflow port, with the lower end of the sludge output pipe extending to the lower middle part of the cyclone pool and the upper end of the sludge output pipe connected to the input end of a sand pump. An inorganic sand discharge port is opened at the bottom of the cyclone pool.

2. The activated sludge screening device according to claim 1, characterized in that: A swirling stirring shaft is axially inserted into the overflow port. The upper end of the swirling stirring shaft is connected to a stirring power component, which drives the swirling stirring shaft to rotate. A stirring blade is provided on the outer wall of the lower end of the swirling stirring shaft.

3. The activated sludge screening device according to claim 2, characterized in that: The swirling mixing shaft has an internally hollow tubular structure, with both the top and bottom of the swirling mixing shaft being open; the sludge output pipe coaxially passes through the swirling mixing shaft.

4. The activated sludge screening device according to claim 2, characterized in that: An installation platform is provided directly above the cyclone pool, and the cyclone stirring shaft rotatably passes through the installation platform. The stirring power component includes a stirring motor, a driving pulley, a driven pulley, and a transmission belt. The stirring motor is mounted on the installation platform, and the output shaft of the stirring motor is connected to the driving pulley. The driven pulley is mounted on the outside of the cyclone stirring shaft, and the driven pulley is connected to the driving pulley via a transmission belt. The stirring motor drives the cyclone stirring shaft to rotate through the driving pulley, the transmission belt, and the driven pulley.

5. The activated sludge screening device according to claim 4, characterized in that: The sand pump is mounted on the installation platform.

6. The activated sludge screening device according to claim 2, characterized in that: The top of the overflow port is closed and the bottom is open. The swirling stirring shaft passes through the top of the overflow port and is rotatably connected to the top of the overflow port through a bearing.

7. The activated sludge screening device according to claim 1, characterized in that: The upper end of the overflow port extends above the vortex pool, and an overflow discharge pipe is connected to the upper side wall of the overflow port. The overflow discharge pipe is connected to the sludge thickening tank.

8. The activated sludge screening device according to claim 1, characterized in that: The output end of the sand pump is connected to the biochemical tank via a pipeline.

9. The activated sludge screening device according to claim 1, characterized in that: The inorganic sand outlet is connected to the sludge thickening tank through an inorganic sand output pipe, and a control valve is installed at the end of the inorganic sand output pipe near the inorganic sand outlet.

10. An activated sludge screening device according to claim 1, characterized in that: The vortex tank includes an upper cylindrical section, a conical section, and a lower cylindrical section distributed from top to bottom. The sludge inlet is located on the upper side of the upper cylindrical section, and the overflow outlet is located at the top center of the upper cylindrical section. The inorganic sand outlet is located at the bottom of the lower cylindrical section. The lower port of the sludge outlet pipe extends into the conical section.

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