An improved vertical flow sedimentation tank

Abstract

The present invention discloses an improved vertical flow sedimentation tank, comprising a tank body, a water inlet and a water outlet provided on the tank body, a conical mud hopper with a larger upper portion and a smaller lower portion provided at the bottom of the tank body, a mud scraping device provided in the tank body, the mud scraping device comprising a driving device, a central transmission shaft and a scraper, the central transmission shaft being connected to the output end of the driving device, the scraper being fixed on the central transmission shaft, the scraper being located on the inner side of the mud hopper, and a mud discharge port being provided at the bottom of the mud hopper. The improved vertical flow sedimentation tank disclosed in the present invention has a mud scraping device provided in its tank body, during the sewage treatment process, the driving device can drive the central transmission shaft to rotate slowly, the scraper can scrape and stir the sludge in the mud hopper, which serves as a sludge concentration area, thereby increasing the fluidity of the sludge, allowing the sludge to be continuously and smoothly discharged from the mud discharge port, avoiding sludge blockage, achieving a good sedimentation effect on the sludge, ensuring the continuity and efficiency of mud discharge, and ensuring the water purification effect.

Description

Technical Field

[0001] The invention relates to a sewage treatment device, in particular to an improved vertical flow sedimentation tank. Background Art

[0002] Sedimentation tanks are a common sewage treatment device or system that removes suspended solids and purifies water. Existing sedimentation tanks typically consist of a tank body with an inlet and outlet, a settling device within the tank, and a sludge collection hopper at the bottom. Water flows through the inlet into the tank body, where sludge settles in the settling device and is collected by the sludge collection hopper. Purified water is then discharged through the outlet. For example, a fast horizontal flow high-efficiency sedimentation and separation device disclosed in CN202822888U includes a rectangular pool body on the upper part and a conical mud collecting bucket on the lower part. Several rows of parallel special-shaped inclined plates are arranged in the vertical direction of the rectangular pool body. The special-shaped inclined plates are composed of vertical baffles and upward inclined plates. The inclined plate ends of the special-shaped inclined plates are fixed on the vertical partition plates, and the vertical baffle ends are fixed on the vertical partition bars. The two parallel special-shaped inclined plates adjacent to each other above and below form a horizontal flow channel with the vertical partition plate. The cross-sectional shape of the flow channel is a parallelogram. A mud discharge port is left between the vertical baffles of the upper and lower special-shaped inclined plates. The two rows of special-shaped inclined plates are arranged symmetrically about the vertical partition plate axis to form a special-shaped inclined plate group. The area between the vertical partition bars of the adjacent two special-shaped inclined plate groups is set as a mud discharge channel. The mud discharge port between the vertical baffles of the upper and lower special-shaped inclined plates is connected to the mud discharge channel. The device has a compact structure, a small size, and occupies a small space. The separation of water and suspended matter is fast, thorough and efficient. The existing sedimentation tank simply collects sludge through the sludge collecting hopper. Due to the high viscosity of the sludge, it is easy to adhere to and accumulate in the sedimentation device and the sludge collecting hopper, resulting in the sludge not being discharged in a timely and effective manner, affecting the continuity and efficiency of sludge discharge. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an improved vertical flow sedimentation tank with good sludge sedimentation effect, continuous sludge discharge and high sludge discharge efficiency in view of the shortcomings of the existing technology.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an improved vertical flow sedimentation tank, including a tank body, the tank body is provided with a water inlet and a water outlet, the bottom of the tank body is provided with a conical mud bucket with a larger upper part and a smaller lower part, the tank body is provided with a mud scraping device, the mud scraping device includes a driving device, a central transmission shaft and a scraper, the central transmission shaft is connected to the output end of the driving device, the scraper is fixed on the central transmission shaft, the scraper is located on the inner side of the mud bucket, and the bottom of the mud bucket is provided with a mud discharge port.

[0005] The vertical flow sedimentation tank of the present invention is provided with a sludge scraping device in the tank body. During the sewage treatment process, the driving device can drive the central transmission shaft to rotate slowly, and the scraper can scrape and stir the sludge in the sludge hopper serving as the sludge concentration area, thereby increasing the fluidity of the sludge, so that the sludge can be continuously and smoothly discharged from the sludge discharge port, avoiding sludge blockage, having a good sedimentation effect on the sludge, ensuring the continuity and efficiency of sludge discharge, and ensuring the water quality purification effect.

[0006] Preferably, the scraping device includes a plurality of inclined plates, each of which is fixedly connected to the central transmission shaft via a plurality of connecting rods. Each inclined plate is arranged parallel to the inner side of the mud bucket, and a gap is formed between each inclined plate and the inner side of the mud bucket. The arrangement of the plurality of inclined plates ensures a scraping effect while also providing a certain diversion effect, thereby promoting the flow of sludge to the mud discharge port.

[0007] Preferably, a central tube, a sleeve and a mud turning box are fixed in an upright position in the pool body, the sleeve is arranged on the outside of the central tube, the sleeve and the central tube form a closed annular cavity, the water inlet and the water outlet are respectively located at the upper part of the pool body, a water inlet pipe is passed through the water inlet, the water inlet pipe is communicated with the annular cavity, the lower part of the central tube is open, a plurality of through holes are opened on the side wall of the central tube, and the inner cavity of the central tube is communicated with the annular cavity through the plurality of through holes. The central tube is sleeved on the outside of the central transmission shaft, and the mud turning box is mounted above the mud hopper. The outer side of the mud turning box and the inner side of the pool body form an annular channel. The upper portion of the mud turning box is open, and the lower portion of the central transmission shaft passes through the mud turning box and extends into the mud hopper. The lower portions of the sleeve and the central tube respectively extend into the bottom of the mud turning box. During use, sewage introduced into the annular cavity from the water inlet pipe enters the inner cavity of the central tube through multiple through holes and continuously flows into the mud turning box from the lower portion of the central tube. Utilizing the principle of gravity, mud, flocs, colloids, etc. in the sewage slowly settle in the middle and lower portions of the mud turning box. The supernatant overflows from the upper portion of the mud turning box and accumulates in the pool body. As the water level in the pool body continues to rise, the water eventually flows out of the pool body through the outlet. As mud, flocs, and colloids accumulate in the tumbling box, a "natural filter layer" forms within it, filtering the subsequent wastewater entering the box. This filter and intercepts mud and contaminants, achieving a certain degree of water purification and improving the efficiency of vertical sewage sedimentation. Eventually, as the sludge accumulates within the tumbling box, it overflows from the upper portion of the box and, under its own weight, flows continuously into the mud hopper through the annular channel. The coordinated use of the central tube, sleeve, and tumbling box allows for a more concentrated flow of wastewater, allowing it to be directed into the tumbling box. After natural settling, the supernatant is discharged first. In the initial stages of sewage treatment, the tumbling box primarily contains a mixture of mud and water. As the amount of sludge accumulated increases, the supernatant first overflows from the upper portion. However, when the sludge accumulates to a certain level, it will also overflow from the upper portion.

[0008] Furthermore, a plurality of first support cross bars are fixed to the outside of the mud turning box, and the mud turning box is fixed to the bottom of the pool body through the plurality of first support cross bars. A plurality of second support cross bars are fixed to the inside of the mud turning box, and the ends of each second support cross bar are respectively fixed to the sleeve and the mud turning box. The first support cross bars and the second support cross bars can increase the strength of the mud turning box and facilitate its installation.

[0009] Preferably, the lower portion of the central tube is connected to a water distribution device, which is suspended within the mud turning box. When in use, the sewage within the central tube flows through the water distribution device and enters the mud turning box. In addition to distributing water, the water distribution device also exerts a certain surge effect on the sludge within the mud turning box, causing excess sludge to overflow from the upper portion of the mud turning box and fall into the annular channel and mud hopper for concentration, thereby improving the continuity of mud discharge.

[0010] Furthermore, the water distribution device includes an even number of water distribution pipes arranged horizontally with the central transmission shaft as the center, each of the water distribution pipes is provided with a plurality of water distribution holes, and the plurality of water distribution holes are arranged at intervals along the length direction of each of the water distribution pipes to ensure uniform water distribution effect.

[0011] Preferably, the diameter of the water distribution holes on each of the water distribution pipes gradually increases as the distance from the central transmission shaft gradually increases. Since sewage flows from the middle of the mud turning box during the water treatment process, the design of the water distribution holes with gradually increasing diameters is conducive to further ensuring uniform water distribution.

[0012] Preferably, the multiple water distribution holes are opened at the lower part of each of the water distribution pipes, and the multiple water distribution holes are symmetrically arranged with the longitudinal section passing through the center line of each of the water distribution pipes as the center, which can also improve the uniformity of water distribution.

[0013] Preferably, a cylindrical overflow weir is provided within the tank body. The overflow weir is located at the upper portion of the inner side of the tank body. The outer diameter of the overflow weir is smaller than the inner diameter of the tank body. The outer side of the overflow weir and the inner side of the tank body form an annular water collection trough with an upper opening. The water outlet communicates with the water collection trough. The overflow weir acts as a buffer to prevent a large amount of water from flowing toward the outlet, thereby ensuring effective water treatment.

[0014] Preferably, the upper edge of the overflow weir is provided with a circle of serrations to provide further buffering effect.

[0015] Compared with the prior art, the present invention has the following advantages: the improved vertical flow sedimentation tank disclosed in the present invention is provided with a sludge scraping device in the tank body. During the sewage treatment process, the driving device can drive the central transmission shaft to rotate slowly, and the scraper can scrape and stir the sludge in the sludge hopper serving as the sludge concentration area, thereby increasing the fluidity of the sludge, allowing the sludge to be continuously and smoothly discharged from the sludge discharge port, avoiding sludge blockage, having a good sludge sedimentation effect, ensuring the continuity and efficiency of sludge discharge, and ensuring the water purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an improved vertical flow sedimentation tank in an embodiment;

[0017] Figure 2 This is a schematic diagram of the size arrangement of the water distribution holes on the water distribution pipe;

[0018] Figure 3 Schematic diagram of the connection between the water distribution device including two water distribution pipes, the central tube and the central transmission shaft (top view);

[0019] Figure 4 Schematic diagram of the connection between the water distribution device including four water distribution pipes, the central tube and the central transmission shaft (top view);

[0020] Figure 5 Schematic diagram of the connection between the water distribution device including 8 water distribution pipes, the central tube and the central transmission shaft (top view);

[0021] Figure 6 Schematic diagram of the cross section of a water distribution pipe provided with one row of water distribution holes;

[0022] Figure 7 Schematic diagram of the cross section of a water distribution pipe with three rows of water distribution holes;

[0023] Figure 8 It is a schematic cross-sectional view of a water distribution pipe with four rows of water distribution holes. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0025] The improved vertical flow sedimentation tank of Example 1 is as follows Figure 1 As shown, it includes a pool body 1, a water inlet 11 and a water outlet 12 are provided on the pool body 1, a conical mud bucket 2 with a larger upper part and a smaller lower part is provided at the bottom of the pool body 1, and a mud scraping device is provided in the pool body 1. The mud scraping device includes a driving device 31, a central transmission shaft 3 and a scraper. The central transmission shaft 3 is connected to the output end of the driving device 31. In this embodiment, the driving device 31 adopts a motor, the motor 31 is installed at the top of the pool body 1, the scraper is fixed on the central transmission shaft 3, the scraper is located on the inner side of the mud bucket 2, and the scraper includes a plurality of inclined plates 4, and the plurality of inclined plates 4 are connected to the plurality of connecting rods 41. The central transmission shaft 3 is fixedly connected, each inclined plate 4 is arranged parallel to the inner side of the mud bucket 2, and there is a gap 42 between each inclined plate 4 and the inner side of the mud bucket 2. A mud discharge port 21 is provided at the bottom of the mud bucket 2, and a cylindrical overflow weir 13 is provided in the pool body 1. The overflow weir 13 is arranged at the upper part of the inner side of the pool body 1. The outer diameter of the overflow weir 13 is smaller than the inner diameter of the pool body 1. A circle of serrations 14 is provided on the upper edge of the overflow weir 13. The outer side surface of the overflow weir 13 and the inner side surface of the pool body 1 form an annular water collecting trough 15 with an upper opening, and the water outlet 12 is communicated with the water collecting trough 15.

[0026] In Example 1, a central tube 5, a sleeve 6 and a mud turning box 7 are fixed upright in the pool body 1. The sleeve 6 is sleeved on the outside of the central tube 5. The sleeve 6 and the central tube 5 form a closed annular cavity 61. The water inlet 11 and the water outlet 12 are respectively located at the upper part of the pool body 1. A water inlet pipe 16 is crossed at the water inlet 11, and the water inlet pipe 16 is communicated with the annular cavity 61. The lower part of the central tube 5 is open, and a plurality of through holes 51 are opened on the side wall of the central tube 5. The inner cavity of the central tube 5 is communicated with the annular cavity 61 through the plurality of through holes 51. The central tube 5 is sleeved on the outside of the central transmission shaft 3, and the mud turning box 7 is mounted above the mud bucket 2. The outer side surface of the mud turning box 7 and the inner side surface of the pool body 1 form an annular channel 17. The upper part of the mud turning box 7 is open, and the lower part of the central transmission shaft 3 passes through the mud turning box 7 and extends into the mud bucket 2. The lower parts of the sleeve 6 and the central tube 5 respectively extend into the bottom of the mud turning box 7.

[0027] In Example 1, several first supporting cross bars 71 are fixed to the outside of the mud turning box 7, and the mud turning box 7 is fixed to the bottom of the pool body 1 through the several first supporting cross bars 71. Several second supporting cross bars 72 are fixed to the inside of the mud turning box 7, and the two ends of each second supporting cross bar 72 are respectively fixed on the sleeve 6 and the mud turning box 7.

[0028] The improved vertical flow sedimentation tank of Example 2 is different from that of Example 1 in that, in Example 2, the lower part of the central tube 5 is connected to a water distribution device, and the water distribution device is suspended in the mud turning box 7. When in use, the sewage in the central tube 5 flows through the water distribution device and enters the mud turning box 7.

[0029] In Example 2, the water distribution device includes an even number of water distribution pipes 8 arranged horizontally with the central transmission shaft 3 as the center, and each water distribution pipe 8 is provided with a plurality of water distribution holes 81, and the plurality of water distribution holes 81 are arranged at intervals along the length direction of each water distribution pipe 8; the plurality of water distribution holes 81 are opened at the lower part of each water distribution pipe 8, and the plurality of water distribution holes 81 are symmetrically arranged with the longitudinal section passing through the center line of each water distribution pipe 8 as the center; as the distance from the central transmission shaft 3 gradually increases, the aperture of the water distribution hole 81 on each water distribution pipe 8 gradually increases, such as Figure 2 shown.

[0030] In embodiment 2, the number of water distribution pipes 8 is even, which can be 2 (e.g. Figure 3 As shown), 4 (as shown Figure 4 As shown), 8 (as shown Figure 5 The number of water distribution holes 81 symmetrically arranged with the longitudinal section through the center line of each water distribution pipe 8 as the center can be 1 row (as shown) or other even number. Figure 6 As shown), 3 rows (as Figure 7 As shown), 4 rows (as Figure 8 as shown) or other number of rows.

[0031] When treating sewage in the improved vertical flow sedimentation tank of Example 2, sewage introduced from the water inlet pipe 16 into the annular cavity 61 enters the inner cavity of the central tube 5 via multiple through-holes 51, continuously enters the water distribution device from the lower portion of the central tube 5, and flows into the mud evacuation tank 7 through the water distribution holes 81. Due to the principle of gravity, mud, flocs, colloids, and other substances in the sewage slowly settle in the middle and lower portion of the mud evacuation tank 7. The supernatant overflows from the upper portion of the mud evacuation tank 7 and accumulates within the tank body 1. As the water level within the tank body 1 continues to rise, the water eventually flows out of the tank body through the outlet 12. As the mud, flocs, colloids, and other substances accumulate within the mud evacuation tank 7, a "natural filter layer" is formed within the mud evacuation tank 7, filtering the sewage that subsequently enters the mud evacuation tank 7 and intercepting mud and pollutants. Therefore, the sludge within the mud evacuation tank 7 also plays a certain role in purifying water quality, improving the efficiency of the vertical flow sedimentation of sewage. Finally, as more and more sludge is deposited in the mud turning box 7 , the sludge overflows from the upper part of the mud turning box 7 and continuously flows into the mud hopper 2 through the annular channel 17 under the action of its own weight.

[0032] In the initial stages of sewage treatment, the sludge tank 7 is primarily a mixture of mud and water. As the amount of sludge deposited in the sludge tank 7 increases, the supernatant first overflows from the upper portion of the sludge tank 7. Once the sludge accumulates to a certain level, it also overflows from the upper portion of the sludge tank 7. The sludge in the sludge tank 7 is essentially a mixture of mud, flocculent matter, and colloids. As sewage treatment progresses, this mixture forms a natural filter layer, filtering the sewage that subsequently enters the sludge tank 7, intercepting mud and pollutants and achieving a certain degree of water purification. As water treatment progresses, water accumulates in the tank body 1, and the water level within the tank body 1 continuously rises. Water overflows from the overflow weir 13, enters the sump 15, and ultimately flows out of the tank body 1 through the outlet 12. Under its own weight, the overflowing sludge continuously flows into the mud hopper 2 through the annular channel 17, where it is concentrated and ultimately discharged through the mud discharge port 21. Figure 1 The arrows in the middle indicate the liquid flow paths.

[0033] During the sewage treatment process, the driving device 31 drives the central transmission shaft 3 to rotate slowly, and the scraper can scrape and stir the sludge in the mud hopper 2 which serves as the sludge concentration area, thereby increasing the fluidity of the sludge and enabling the sludge to be continuously and smoothly discharged from the mud discharge port 21, avoiding sludge blockage, having a good sedimentation effect on the sludge, ensuring the continuity and efficiency of mud discharge, and ensuring the water purification effect.

[0034] In addition to distributing water, the water distribution device also has a certain surge effect on the sludge in the mud turning box 7, causing excess sludge to overflow from the upper part of the mud turning box 7 and fall into the annular channel 17 and the mud hopper 2 to be concentrated, thereby improving the continuity of mud discharge.

Claims

1. An improved vertical flow sedimentation tank, comprising a tank body, wherein the tank body is provided with a water inlet and a water outlet, and the bottom of the tank body is provided with a conical mud hopper with a larger upper portion and a smaller lower portion, characterized in that: The described pool body is provided with a mud scraping device, and the mud scraping device includes a driving device, a central transmission shaft and a scraper, and the central transmission shaft is connected to the output end of the described driving device, and the scraper is fixed on the described central transmission shaft, and the scraper is located on the inner side of the described mud bucket, and a mud discharge port is opened at the bottom of the described mud bucket, and the scraper includes a plurality of inclined plates, and the plurality of inclined plates are fixedly connected to the described central transmission shaft through a plurality of connecting rods, each of the plurality of inclined plates is arranged parallel to the inner side surface of the described mud bucket, and there is a gap between each of the plurality of inclined plates and the inner side surface of the described mud bucket, and an upright central tube, a sleeve and a mud turning box are fixed in the described pool body, and the sleeve is arranged on the outer side of the described central tube, and the sleeve and the described central tube form a closed annular cavity, and the water inlet and the water outlet are respectively located at the upper part of the described pool body, and a water inlet pipe is crossed at the water inlet, and the water inlet pipe is communicated with the described annular cavity, and the lower part of the described central tube The hopper is connected to the hopper by means of a channel, and the channel is opened to the top of the hopper, and the channel is opened to the outside of the hopper. The hopper is connected to the hopper by means of a channel, and the channel is opened to the outside of the hopper. The hopper is connected to the hopper by means of a channel, and the channel is opened to the outside of the hopper.

2. The improved vertical flow sedimentation tank according to claim 1, characterized in that: Several first supporting cross bars are fixed to the outside of the mud turning box, and the mud turning box is fixed to the bottom of the pool body through the several first supporting cross bars. Several second supporting cross bars are fixed to the inside of the mud turning box, and the two ends of each of the second supporting cross bars are respectively fixed to the sleeve and the mud turning box.

3. The improved vertical flow sedimentation tank according to claim 1, characterized in that: As the distance from the central transmission shaft gradually increases, the aperture of the water distribution hole on each water distribution pipe gradually increases.

4. The improved vertical flow sedimentation tank according to claim 1, characterized in that: The multiple water distribution holes are opened at the lower part of each of the water distribution pipes, and the multiple water distribution holes are symmetrically arranged with the longitudinal section passing through the center line of each of the water distribution pipes as the center.

5. The improved vertical flow sedimentation tank according to claim 1, characterized in that: A cylindrical overflow weir is provided in the pool body, and the overflow weir is provided at the upper part of the inner side of the pool body. The outer diameter of the overflow weir is smaller than the inner diameter of the pool body. The outer side surface of the overflow weir and the inner side surface of the pool body form an annular water collecting trough with an upper opening, and the water outlet is connected to the water collecting trough.

6. The improved vertical flow sedimentation tank according to claim 5, characterized in that: The upper edge of the overflow weir is provided with a circle of saw teeth.

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