Sludge concentration tank for treatment of water from water supply

Abstract

The present application belongs to the technical field of water purification and sludge treatment equipment, and specifically discloses a sludge concentration tank for treating tap water and sludge water, which comprises a tank body, a central reaction cylinder arranged in the middle of the tank body, a water inlet pipe connected to the central reaction cylinder, a sludge accumulation area at the lower part of the tank body, a clarification area at the upper part of the tank body, and a balance tank connected to the sludge accumulation area; a plurality of annular water collecting and discharging pipes are fixedly arranged on the inner wall of the clarification area, the annular water collecting and discharging pipes are in communication with a total water outlet pipe, and the total water outlet pipe is connected to a water recycling tank; a plurality of water collecting holes are arranged at the bottom of each annular water collecting and discharging pipe, the number of water collecting holes increases from the bottom to the top, and a plurality of air vents are arranged at the top of each annular water collecting and discharging pipe; in addition to the uppermost annular water collecting and discharging pipe, an independent electric butterfly valve is arranged on each of the other annular water collecting and discharging pipes. The present application realizes the multiple functions of flow regulation, sedimentation, sludge concentration and sludge-water separation in one, reduces the occupied area, and is resistant to the impact of uneven sludge water discharge.

Description

A sludge thickening tank for tap water sludge treatment Technical Field

[0001] This invention relates to the field of water purification and sludge treatment equipment technology, specifically to a sludge thickening tank for treating tap water sludge discharge. Background Technology

[0002] With increasing environmental awareness, the issue of wastewater discharge from waterworks has received widespread attention. Typically, waterworks use a concentration process to bring the solids content of their wastewater up to the required level for sludge dewatering equipment. Concentrators are recognized as the most stable type of concentrator due to their simple structure, convenient operation and management, and strong adaptability to water volume and quality. They are also the mainstream sludge concentration process tank type used in waterworks today. After the sludge from the waterworks is discharged, it undergoes sludge-water separation in the concentration tank. The supernatant is reused in the recycling tank, while the concentrated sludge at the bottom enters the balancing tank and then proceeds to the dewatering room for further dewatering.

[0003] To prevent the supernatant from mixing with the sludge, existing sludge thickening tanks typically have an overflow pipe or a ring-shaped water collection and outlet pipe at the top. This allows the supernatant to overflow, achieving sludge-water separation. In actual sludge discharge processes at waterworks, the flow rate of the discharged sludge varies significantly over time. When the discharge volume is small, the hydraulic load on the sludge thickening tank is low, resulting in clearer effluent. However, when the discharge volume is large, to prevent the supernatant from becoming turbid due to impact, a regulating tank is usually installed upstream of the sludge thickening tank, or the tank itself is designed to be larger. This results in a large footprint for the overall structure and higher infrastructure investment.

[0004] A Chinese patent with patent number ZL20192186006620 discloses a thickening tank that divides the interior into upper and lower layers, each with its own annular water collection and outlet pipe, allowing each layer to discharge water independently and improving thickening efficiency. However, in actual use, when the sludge discharge volume is large, the sludge in the upper layer mixes with the clear liquid in the lower layer as it falls, resulting in the clear liquid flowing out of the lower layer containing sludge, which does not lead to good thickening. Similarly, when the sludge discharge volume is small, the upper thickening tank cannot be used, which is wasteful and cannot achieve an effective process of discharging clear water. Its structure and device are relatively complex, which is not conducive to improvement and processing based on existing thickening tanks, and the actual use effect is not ideal. Summary of the Invention

[0005] The purpose of this invention is to provide a sludge thickening tank for tap water sludge treatment that integrates multiple functions such as flow regulation, sedimentation, sludge thickening, and sludge-water separation, reduces the floor space required, and is resistant to the impact of uneven sludge discharge.

[0006] This invention is achieved through the following technical solution: a sludge thickening tank for treating tap water sludge discharge, comprising a tank body, a central reaction cylinder arranged in the middle of the tank body, the central reaction cylinder being connected to an inlet pipe extending out of the tank body, a sludge accumulation zone at the bottom of the tank body and a clarification zone at the top, the sludge accumulation zone being connected to a balance water tank through a sludge pipe; several layers of annular water collection and outlet pipes distributed around the inner wall of the upper clarification zone of the tank body are fixedly arranged, each layer of annular water collection and outlet pipes being connected to a main outlet pipe through a pipe extending out of the tank body, the main outlet pipe leading to a recycled water tank; several water collection holes are provided at the bottom of each layer of annular water collection and outlet pipes, the number of water collection holes increasing from bottom to top, and several vent holes are provided at the top of each layer of annular water collection and outlet pipes; except for the uppermost annular water collection and outlet pipe, each of the lower layers of annular water collection and outlet pipes is also equipped with an independent electric butterfly valve.

[0007] The principle of this technical solution is as follows: Multiple layers of annular water collection and outlet pipes are added to the inner wall of the upper clarification zone of the tank. Each annular water collection and outlet pipe has a water collection hole at the bottom and a vent hole at the top. When the clear liquid in the upper clarification zone overflows the water collection hole at the bottom of the annular water collection and outlet pipe, it is discharged into the main outlet pipe through the small holes, and finally enters the reclaimed water tank. The sludge in the lower clarification zone enters the lower sludge accumulation zone and is discharged through the sludge pipe, thus achieving the sludge thickening process of the sludge discharge water. The downward-facing water collection holes prevent sludge from entering the annular water collection and outlet pipes, and the small diameter of the water collection pipes further facilitates the separation of sludge and clear water. Its simple structure allows for the modification of existing sludge thickening tanks, further improving sludge thickening efficiency and allowing for a smaller sludge thickening tank design, saving floor space. Each layer of the annular water collection pipe is equipped with downward-facing collection holes. From bottom to top, the number of collection holes gradually increases in each layer. The lowest layer has the smallest outflow, while the flow rate gradually increases with each subsequent layer. The uppermost annular water collection pipe can be used as an overflow pipe, therefore no electric butterfly valve is installed to prevent overflow. The lower annular water collection pipes are equipped with electric butterfly valves. This allows control of the opening and closing of each layer's electric butterfly valves to ensure that only the clear liquid from the top layer of the pool can be discharged, and to regulate the flow rate of the upper clear liquid from the main outlet pipe. Furthermore, the opening and closing of each layer's electric butterfly valves controls the on / off state of each annular water collection pipe. Therefore, the height of the annular water collection pipes determines the volume of sludge-discharged water in the pool, enabling adjustment of the actual pool volume.

[0008] To better realize the present invention, an electromagnetic flow meter capable of measuring the inlet flow rate is further installed on the inlet pipe, and a level gauge capable of displaying the liquid level in the pool is also installed in the pool body.

[0009] To better realize the present invention, further, the inner wall of the upper clarification zone of the pool is provided with several multi-layer support frames made of angle steel, and each layer of annular water collection and outlet pipe is fixed in the multi-layer support frame of the corresponding layer by clamps.

[0010] To better realize the present invention, a central drive thickener is further provided in the sludge accumulation area below the central reaction cylinder, and a sludge collection pit is provided at the bottom of the tank below the central drive thickener. The sludge collection pit is connected to the balance water tank through a sludge pipe.

[0011] To better realize the present invention, the bottom of the sludge accumulation area is a slope that slopes towards the sludge collection pit.

[0012] To better realize the present invention, a drain pipe is further provided outside the pool body, and the drain pipe is connected to the lower part of the sludge accumulation area of ​​the pool body through a pipe equipped with a valve.

[0013] To better realize the present invention, a sludge cam pump is further installed on the sludge pipe.

[0014] To better realize the present invention, a conical baffle plate is further installed at the bottom of the central reaction cylinder, located above the central drive concentrator.

[0015] To better realize the present invention, further, four layers of annular water collection and outlet pipes are fixed on the inner wall of the upper clarification zone of the pool. The water collection holes at the bottom of each annular water collection and outlet pipe are evenly distributed at equal intervals, and the diameter of the water collection holes at the bottom of each annular water collection and outlet pipe increases sequentially from bottom to top.

[0016] To better realize the present invention, the number of vent holes at the top of the annular water collection and outlet pipe of each layer is not less than 6, and the diameter of both the water collection hole and the vent hole is not greater than 40mm.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] (1) The present invention comprises several layers of annular water collection and outlet pipes distributed around the inner wall of the upper clarification zone of the pool. Each annular water collection and outlet pipe has a water collection hole at the bottom and an air vent at the top. Each layer of annular water collection and outlet pipes is provided with a downward-opening water collection hole. From bottom to top, the number of water collection holes in each layer of annular water collection and outlet pipes gradually increases. The water output of the lowest layer of annular water collection and outlet pipes is the smallest. The water flow rate of each layer of annular water collection and outlet pipes gradually increases. The water output of the highest layer of annular water collection and outlet pipes is the smallest. It can be used as an overflow pipe, so no electric butterfly valve is installed to avoid the tank overflowing. The lower annular water outlet collection pipe is equipped with an electric butterfly valve. When the water level exceeds the water collection hole of the annular water outlet collection pipe of this layer, the electric butterfly valves on the other annular water outlet collection pipes are closed, and only the electric butterfly valve of this layer is opened, so that the clear liquid in the uppermost clarification zone flows out directly through the annular water outlet collection pipe of this layer, so as to ensure that the outflowing liquid is the upper clear liquid in the tank, thereby realizing the flow control of the clear water discharged from the clarification zone.

[0019] (2) In this invention, the opening and closing of each layer of electric butterfly valve can be used to control the on / off of each layer of annular water collection outlet pipe. The different heights of the annular water collection outlet pipe determine the volume of mud-drained water in the pool, thereby realizing the adjustment of the actual volume of the pool.

[0020] (3) The present invention provides an annular water collection and outlet pipe on the inner wall of the clarification zone. The pipe allows clear water to enter through a water collection hole. The water collection hole has a small diameter and is located at the bottom of the annular water collection and outlet pipe, which can ensure mud-water separation to the greatest extent.

[0021] (4) By setting up a multi-layer ring-shaped water collection and outlet pipe, the present invention can solve the problem of integrating the functions of the equalization tank and the thickening tank into one structure, realizing multiple functions of flow regulation, sedimentation, sludge thickening and sludge-water separation, reducing the number of structures, thereby reducing the land area and investment, and realizing the impact resistance of uneven sludge discharge, which is suitable for widespread application. Attached Figure Description

[0022] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 is a top view of the structure of the present invention;

[0024] Figure 2 is a cross-sectional view along direction AA in this invention;

[0025] Figure 3 is a cross-sectional view along the BB direction in this invention;

[0026] Figure 4 is a top view of the annular water collection and outlet pipe in this invention;

[0027] Figure 5 is a cross-sectional view along the CC direction in this invention.

[0028] Wherein: 1—tank body, 2—central reaction cylinder, 3—inlet pipe, 4—sludge pipe, 5—ring-shaped water collection and outlet pipe, 51—water collection hole, 52—vent hole, 6—main outlet pipe, 7—electric butterfly valve, 8—central drive thickener, 9—sludge collection pit, 10—vent pipe, 11—sludge accumulation area, 12—clarification area, 13—multi-layer support frame, 14—clamp, 15—sludge cam pump, 16—electromagnetic flow meter, 17—conical baffle plate. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "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 invention and simplifying the description, 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 invention.

[0031] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Example 1:

[0033] The main structure of this embodiment, as shown in Figures 1, 2, 3, and 5, includes a pool body 1. A central reaction cylinder 2 is located in the middle of the pool body 1, and the central reaction cylinder 2 is connected to an inlet pipe 3 extending out of the pool body 1. The lower part of the pool body 1 is a sludge accumulation zone 11, and the upper part is a clarification zone 12. The sludge accumulation zone 11 is connected to a balance water tank through a sludge pipe 4. Several layers of annular water collection and outlet pipes 5 are fixedly arranged around the inner wall of the clarification zone 12 in the upper part of the pool body 1. Each layer of annular water collection and outlet pipes 5... Water outlet pipes 5 are connected to the main outlet pipe 6 via pipes extending out of the pool body 1. The main outlet pipe 6 leads into the recycled water pool. Each layer of annular water collection outlet pipes 5 has several water collection holes 51 at the bottom. From bottom to top, the number of water collection holes 51 at the bottom of each layer of annular water collection outlet pipes 5 increases layer by layer. Each layer of annular water collection outlet pipes 5 has several vent holes 52 at the top. Except for the uppermost annular water collection outlet pipe 5, each layer of annular water collection outlet pipes 5 below it is also equipped with an independent electric butterfly valve 7.

[0034] As shown in Figure 1, the pool body 1 is set in a cylindrical shape. In fact, the pool body 1 can be set in a cylindrical shape or a rectangular shape.

[0035] The specific implementation process is as follows: the sludge discharge water from the waterworks enters the central reaction cylinder 2 in the middle of the tank 1 through the inlet pipe 3. The outlet of the central reaction cylinder 2 is equipped with a gradually expanding funnel-shaped opening. Coagulants such as PAM can be added to the central reaction cylinder 2 to improve the sludge settling effect. After the sludge discharge water is treated by the coagulant, it forms flocculent sludge that is easy to settle. Due to the presence of the gradually expanding funnel-shaped opening, the flow velocity at the opening is reduced, preventing the flocculent sludge from breaking. The flocculent sludge then settles into the sludge accumulation zone 11, and is transported to the balance tank through the sludge pipe 4. The clear liquid in the clarification zone 12 at the top of the pool 1 enters the annular water collection and outlet pipe 5 through the water collection hole 51 at the bottom of the annular water collection and outlet pipe 5. The vent hole 52 on the annular water collection and outlet pipe 5 prevents the formation of air pockets inside the annular water collection and outlet pipe 5, and at the same time ensures the pressure balance inside and outside the annular water collection and outlet pipe 5, which has an anti-buoyancy function. In this way, the clear liquid finally enters the main outlet pipe 6 through the annular water collection and outlet pipe 5 and finally flows to the reclaimed water pool.

[0036] In addition, from bottom to top, the number of water collection holes 51 in each layer of annular water outlet collection pipe 5 gradually increases. Therefore, the water output of the bottommost annular water outlet collection pipe 5 is the smallest, and the water flow rate of each layer of annular water outlet collection pipe 5 gradually increases. The topmost annular water outlet collection pipe 5 can be used as an overflow pipe, so no electric butterfly valve 7 is installed to avoid overflow of the pool. The lower annular water outlet collection pipes 5 are all equipped with electric butterfly valves. In this way, the flow rate of the upper clear liquid flowing out of the main water outlet pipe can be adjusted by controlling the opening and closing of the electric butterfly valves of each layer.

[0037] When the amount of sludge discharged is small and the liquid level in the pool 1 is low, the clarification zone 12 in the pool 1 only submerges the water collection hole 51 of the bottommost annular water collection pipe 5. At this time, the electric butterfly valves 7 on the upper annular water collection pipe 5 are all closed, and only the electric butterfly valve 7 of the bottommost annular water collection pipe 5 is open, so the clear liquid is discharged through the bottommost annular water collection pipe 5.

[0038] When the amount of sludge discharged is large, the clarification zone 12 in the pool 1 will submerge the water collection hole 51 of the corresponding layer's annular water collection outlet pipe 5. Then, the electric butterfly valve 7 on the corresponding layer's annular water collection outlet pipe 5 will be opened, and the electric butterfly valves 7 of the lower annular water collection outlet pipe 5 and the upper annular water collection outlet pipe 5 of the layer will be closed. Only the clear liquid will be discharged through the annular water collection outlet pipe 5 of the layer.

[0039] When the sludge discharge volume is extremely large, the clarification zone 12 in the pool 1 submerges the water collection hole 51 of the uppermost annular water collection outlet pipe 5, then the electric butterfly valve 7 on all the lower annular water collection outlet pipes 5 is closed, and only the uppermost annular water collection outlet pipe 5 is used to discharge the clear liquid.

[0040] The electric butterfly valve 7 ensures that only the clear liquid from the top layer of the pool 1 enters the main outlet pipe 6, and controls the flow rate of the clear water discharged from the clarification zone.

[0041] Moreover, the liquid level in the pool 1 is determined by the opening and closing of the electric butterfly valve 7 on each ring-shaped water collection and outlet pipe 5. Therefore, the actual volume of sludge discharge water in the pool 1 can be adjusted by controlling the opening and closing of the electric butterfly valve 7 on each ring-shaped water collection and outlet pipe 5. In this way, the pool 1 can realize the function of an regulating pool without the need to set up an additional regulating pool, thereby reducing the number of structures, saving the land area and reducing the investment in infrastructure.

[0042] Example 2:

[0043] This embodiment, based on the above embodiment, further adds an electromagnetic flowmeter 16 and a level gauge, as shown in Figures 1 and 3. An electromagnetic flowmeter 16 capable of measuring the inlet water flow is installed on the inlet pipe 3, and a level gauge capable of displaying the liquid level inside the pool 1 is installed inside the pool body 1. The electromagnetic flowmeter 16 displays the flow rate of the sludge-discharging water in the inlet pipe 3, while the level gauge displays the liquid level inside the pool body 1. Since the flow rate of the clear liquid flowing out of each layer of the annular water collection outlet pipe 5 is different, the flow rate of the sludge-discharging water and the liquid level inside the pool body 1 can be used to determine and control the opening and closing of the electric butterfly valve 7 on each layer of the annular water collection outlet pipe 5, thereby selecting the appropriate layer of the annular water collection outlet pipe 5 for clear liquid discharge. This design ensures that when the flow rate is low and the liquid level is low, the water is discharged from the lower annular outlet collection pipe 5, resulting in a low hydraulic load and short residence time. When the flow rate is high and the liquid level is high, the water is discharged from the upper annular outlet collection pipe 5, resulting in a high hydraulic load and long residence time. This design also ensures that the turbidity of the effluent meets the requirements for reuse.

[0044] In addition, the addition of an electromagnetic flowmeter 16 and a level gauge can be used to design a control system for controlling the opening and closing of the electric butterfly valves 7 on each layer. Through the signals fed back from the electromagnetic flowmeter 16 and the level gauge, the opening and closing of the electric butterfly valves 7 on each layer is automatically controlled. This allows the control system to automatically open the electric butterfly valve 7 on the corresponding layer based on the set water level and flow rate signals when the flow rate fluctuates irregularly, thus achieving tolerance and adjustment to uneven impacts from the sludge discharge flow. The other parts of this embodiment are the same as those in the above embodiment and will not be repeated.

[0045] Example 3:

[0046] This embodiment, based on the above embodiment, further defines the fixing relationship between the annular water collection outlet pipe 5 and the pool body 1, as shown in Figures 4 and 5. Several multi-layered support frames 13 made of angle steel are distributed on the inner wall of the upper clarification zone 12 of the pool body 1. Each layer of the annular water collection outlet pipe 5 is fixed to the corresponding layer of the multi-layered support frame 13 by clamps 14. As shown in Figures 1 and 4, the pool body 1 is cylindrical; therefore, the multi-layered support frames 13 are evenly distributed in a ring shape along the inside of the pool body 1. According to Figure 4, the optimal number is 18 to achieve stable fixing of the multi-layered annular water collection outlet pipe 5. The specific structure of the multi-layered support frame 13 is shown in Figure 5; it is made of angle steel in several layers, with angle steel used for support at the bottom. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0047] Example 4:

[0048] This embodiment, based on the above embodiment, further defines the structure within the sludge accumulation zone 11, as shown in Figures 2 and 3. A central drive thickener 8 is installed within the sludge accumulation zone 11, located below the central reaction cylinder 2. Below the central drive thickener 8 is a sludge collection pit 9 located at the bottom of the tank body 1. The sludge collection pit 9 is connected to the balance tank via a sludge pipe 4. The central drive thickener 8 includes a drive motor located at the top of the tank body 1, a drive shaft extending into the tank body 1, and a stirring grid fixed below the drive shaft. The stirring grid is located in the sludge accumulation zone 11 and can adsorb flocculent sludge, concentrating and collecting the sludge in the sludge accumulation zone 11, and finally scraping it into the sludge collection pit 9 at the bottom of the sludge accumulation zone 11. Finally, the sludge in the sludge collection pit 9 is transported to the balance tank via the sludge pipe 4. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0049] Example 5:

[0050] This embodiment, based on the above embodiment, further defines the structure of the sludge accumulation zone 11, as shown in Figures 2 and 3. The bottom of the sludge accumulation zone 11 is an inclined surface sloping towards the sludge collection pit 9. This arrangement allows the sludge to better converge into the sludge collection pit 9 by utilizing gravity. The other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0051] Example 6:

[0052] This embodiment, based on the above embodiment, further adds a vent pipe 10, as shown in Figures 1 and 2. A vent pipe 10 is also provided outside the pool body 1. The vent pipe 10 is connected to the lower part of the sludge accumulation area 11 of the pool body 1 via a pipe equipped with a valve. The lower part of the vent pipe 10 connects to the sludge accumulation area 11. After the sludge in the sludge collection pit 9 is drained, the wastewater in the sludge accumulation area 11 is vented through the lower pipe. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0053] Example 7:

[0054] This embodiment, based on the above embodiment, further adds a sludge cam pump 15, as shown in Figures 1 and 2. The sludge cam pump 15 is also installed on the sludge pipe 4. The sludge cam pump 15 mainly provides power to the sludge in the sludge pipe 4, allowing the sludge to enter the balancing water tank. The sludge cam pump 15 is also equipped with a maintenance and flushing pipe, which can be used to inspect and flush the sludge pipe 4 after the sludge has been discharged. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0055] Example 8:

[0056] This embodiment, based on the above embodiment, further adds a conical baffle 17, as shown in Figures 2 and 3. The conical baffle 17 is installed at the bottom of the central reaction cylinder 2, above the central drive thickener 8. The conical baffle 17 is designed to prevent the sludge discharge water from directly entering the sludge accumulation area 11 of the tank 1 through the central reaction cylinder 2. Instead, it allows the sludge discharge water to diffuse outwards and slows the flow rate, making it easier to separate the sludge and water, and easier for the bottom sludge to settle and concentrate. It also prevents the sludge discharge water from disturbing the already concentrated sludge at the bottom, thus affecting the concentration process of the sludge thickener. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0057] Example 9:

[0058] Based on the above embodiments, this embodiment further defines the structure of the annular water collection and outlet pipe 5. Four layers of annular water collection and outlet pipes 5 are fixed to the inner wall of the upper clarification zone 12 of the pool body 1. The water collection holes 51 at the bottom of each layer of annular water collection and outlet pipe 5 are evenly distributed at equal intervals. From bottom to top, the diameter of the water collection holes 51 at the bottom of each layer of annular water collection and outlet pipe 5 increases sequentially. To ensure the normal water discharge function of the annular water collection and outlet pipe 5, it is further defined that the annular water collection and outlet pipe 5 has four layers. The larger the diameter of the water collection holes 51 at the bottom of the uppermost annular water collection and outlet pipe 5 and the more openings it has, the greater the flow rate of the clear liquid that can flow out.

[0059] When the flow rate is low, the flow capacity of the lower ring water collection outlet pipe 5 can meet the drainage requirements. When the liquid level is low, the capacity of the lower ring water collection outlet pipe 5 is insufficient. When the liquid level rises to the set water level, the first layer electric butterfly valve 7 is closed. The water level continues to rise, and the supernatant is discharged from the second layer ring water collection outlet pipe 5 to the recycled water tank.

[0060] When the flow rate continues to increase beyond the drainage capacity of the second-layer annular water collection outlet pipe 5, and the liquid level continues to rise to the set water level, the second-layer electric butterfly valve 7 is closed, the water level continues to rise, and the supernatant is discharged from the third-layer annular water collection outlet pipe 5 to the recycled water tank.

[0061] When the flow rate continues to increase beyond the drainage capacity of the third-layer annular water collection outlet pipe 5, and the liquid level continues to rise to the set water level, the third-layer electric butterfly valve 7 is closed, the water level continues to rise, and the supernatant is discharged from the fourth-layer annular water collection outlet pipe 5 to the recycled water tank.

[0062] When the flow rate decreases, the liquid level drops to the set elevation, and the electric butterfly valve 7 is gradually opened from top to bottom. The supernatant is discharged from top to bottom through the annular water collection outlet pipe 5. When the flow rate is low enough, the supernatant will be discharged from the bottom annular water collection outlet pipe 5.

[0063] Since the water collection hole 51 itself has the effect of filtering mud and sand, a metal filter screen can be installed on the water collection hole 51 to further improve its filtration effect and ensure that the outflowing clear liquid does not contain mud and sand. The other parts of this embodiment are the same as those in the above embodiment, and will not be described again.

[0064] Example 10:

[0065] This embodiment, based on the above embodiment, further defines the structure of each layer of annular water collection and outlet pipe 5. The distance between each layer of annular water collection and outlet pipe 5 is the same, and the number of vent holes 52 at the top of each layer of annular water collection and outlet pipe 5 is not less than 6. The diameter of both the water collection hole 51 and the vent hole 52 is not greater than 40mm. The vent holes 52 on the annular water collection and outlet pipe mainly prevent the formation of air pockets inside the annular water collection and outlet pipe 5, and at the same time ensure the pressure balance inside and outside the annular water collection and outlet pipe 5, and have an anti-buoyancy function. This prevents the clear liquid in the clarification zone 12 from entering the annular water collection and outlet pipe 5 through the water collection hole 51 at the bottom of the annular water collection and outlet pipe 5. Therefore, the number of vent holes 52 does not need to be too large. It is preferred that the number of vent holes 52 is not less than 6. After being submerged by the clear liquid, the vent holes 52 also need to achieve a certain filtration effect. Therefore, their diameter and the diameter of the water collection hole 51 should not be too large. It is preferred that they are not greater than 40mm. A filter metal mesh can also be set at the opening of the vent hole 52. The other parts of this embodiment are the same as those in the above embodiment, and will not be described again.

[0066] Example 11:

[0067] This embodiment, based on the above embodiment, further specifies that a support is also provided at the lower part of the main water outlet pipe 6. Since the main water outlet pipe 6 is connected to the annular water collection outlet pipe 5 of each floor, its load is large when the volume of clear liquid is large. To ensure the stability of the main water outlet pipe 6, a support is specifically provided at the lower part of the main water outlet pipe 6. Other parts of this embodiment are the same as those in the above embodiment and will not be described again.

[0068] It is understood that the working principle and process of the sludge thickening tank structure for tap water sludge treatment according to an embodiment of the present invention, such as the central drive thickener 8 and the sludge cam pump 15, are existing technologies and are well known to those skilled in the art, and will not be described in detail here.

[0069] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sludge thickening tank for treating tap water sludge discharge, characterized in that, The system includes a pool body (1), a central reaction cylinder (2) in the middle of the pool body (1), the central reaction cylinder (2) being connected to an inlet pipe (3) extending out of the pool body (1), the lower part of the pool body (1) being a sludge accumulation zone (11), and the upper part being a clarification zone (12), the sludge accumulation zone (11) being connected to a balance water tank through a sludge pipe (4); several layers of annular water collection and outlet pipes (5) are fixedly installed on the inner wall of the upper clarification zone (12) of the pool body (1), each layer of annular water collection and outlet pipes (5) being distributed around the inner wall of the pool body (1), each layer of annular water collection and outlet pipes (5) being connected to a main outlet pipe (6) through a pipe extending out of the pool body (1), the main outlet pipe (6) being connected to a recycled water tank; each layer of annular water collection and outlet pipes (5) is provided with several water collection holes (51) at the bottom, from bottom to top, each layer of annular water collection and outlet pipes... The number of water collection holes (51) at the bottom of the pipe (5) increases layer by layer, and each layer of annular water collection outlet pipe (5) is provided with several vent holes (52) at the top. In addition to the uppermost annular water collection outlet pipe (5), each layer of annular water collection outlet pipe (5) below it is also provided with an independent electric butterfly valve (7). The inner wall of the upper clarification zone (12) of the pool body (1) is fixed with four layers of annular water collection outlet pipe (5). The water collection holes (51) at the bottom of each layer of annular water collection outlet pipe (5) are evenly distributed at equal intervals. From bottom to top, the diameter of the water collection holes (51) at the bottom of each layer of annular water collection outlet pipe (5) increases sequentially. The number of vent holes (52) at the top of each layer of annular water collection outlet pipe (5) is not less than 6, and the diameter of the water collection holes (51) and the vent holes (52) is not greater than 40mm.

2. A sludge thickening tank for treating tap water sludge discharge according to claim 1, characterized in that, An electromagnetic flow meter (16) capable of measuring the inlet flow rate is also installed on the inlet pipe (3), and a level gauge capable of displaying the liquid level in the pool body (1) is also installed inside the pool body (1).

3. A sludge thickening tank for treating tap water sludge discharge according to claim 1, characterized in that, The inner wall of the upper clarification zone (12) of the pool body (1) is provided with several multi-layer support frames (13) made of angle steel. Each layer of annular water collection and outlet pipe (5) is fixed in the multi-layer support frame (13) of the corresponding layer by clamps (14).

4. A sludge thickening tank for treating tap water sludge discharge according to claim 1 or 2, characterized in that, The sludge accumulation area (11) is equipped with a central drive thickener (8) located below the central reaction cylinder (2). Below the central drive thickener (8) is a sludge collection pit (9) located at the bottom of the pool body (1). The sludge collection pit (9) is connected to the balance water pool through a sludge pipe (4).

5. A sludge thickening tank for treating tap water sludge discharge according to claim 4, characterized in that, The bottom of the silt accumulation area (11) is an inclined surface that slopes toward the silt collection pit (9).

6. A sludge thickening tank for treating tap water sludge discharge according to claim 1 or 2, characterized in that, The pool body (1) is also provided with an vent pipe (10) outside, which is connected to the lower part of the sludge accumulation area (11) of the pool body (1) through a pipe with a valve installed.

7. A sludge thickening tank for treating tap water sludge discharge according to claim 1 or 2, characterized in that, A sludge cam pump (15) is also installed on the sludge pipe (4).

8. A sludge thickening tank for treating tap water sludge discharge according to claim 1 or 2, characterized in that, The bottom of the central reaction cylinder (2) is equipped with a conical baffle (17) located above the central drive concentrator (8).

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