Backflushing device and sewage treatment system
By introducing a backwashing device consisting of a water tank, flushing pipe, and water pump into the wastewater treatment system, wastewater treatment can be carried out without interruption during the backwashing process, thereby improving treatment efficiency and reducing energy consumption and water usage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA TOBACCO SICHUAN IND CO LTD
- Filing Date
- 2025-08-25
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies require pausing wastewater treatment during backwashing, which affects treatment efficiency.
A backwashing device is adopted, including a water tank, a flushing pipe, an internal return pipe and a water pump. The water pump sends water from the sewage treatment tank to the flushing pipe, so that backwashing can be achieved without stopping the sewage treatment.
Maintaining wastewater treatment while performing backwashing improves wastewater treatment efficiency, reduces energy consumption and impurity removal rate, and reduces backwashing water consumption.
Smart Images
Figure CN224524139U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wastewater treatment technology, and in particular to a backwashing device and a wastewater treatment system. Background Technology
[0002] In related technologies, a backwashing device is used to impact the filter media layer or filter screen in the sewage treatment tank with reverse water flow to powerfully remove trapped suspended solids, colloids and other pollutants, avoid filter media clogging or caking, and thus restore the system's filtration efficiency and water flow rate.
[0003] However, in related technologies, wastewater treatment needs to be suspended during backwashing, which affects wastewater treatment efficiency. Utility Model Content
[0004] Based on this, this application provides a backwashing device and a wastewater treatment system to solve the technical problem of how to maintain wastewater treatment while performing backwashing operations in order to improve wastewater treatment efficiency.
[0005] On the one hand, this application provides a backwashing device, comprising:
[0006] A water tank, wherein the bottom of the water tank is provided with a drain outlet;
[0007] A flushing pipe is disposed inside the water tank and has spray holes for spraying water toward the inner wall of the water tank;
[0008] An internal return pipe, one end of which is connected to the flushing pipe;
[0009] A water pump is connected to the other end of the internal return pipe and is used to pump water from the sewage treatment tank to the flushing pipe through the internal return pipe.
[0010] In one embodiment, the water tank is provided with an overflow weir, the overflow outlet of the overflow weir is lower than the top of the water tank, and the distance from the overflow outlet to the top of the water tank is 10cm to 15cm. The overflow outlet is used to overflow the upper clear liquid in the water tank into the sewage treatment pond.
[0011] In one embodiment, the system further includes a turbidity sensor and a controller. The turbidity sensor is installed inside the water tank and is used to detect turbidity values. Both the turbidity sensor and the water pump are electrically connected to the controller, which is used to control the start and stop of the water pump based on the turbidity values.
[0012] In one embodiment, when the turbidity value detected by the turbidity sensor is greater than or equal to 50 NTU, the controller controls the water pump to stop pumping water into the flushing pipe.
[0013] In one embodiment, it further includes a first drain pipe, a second drain pipe, a first drain valve, and a second drain valve;
[0014] The first drain valve is installed on the first drain pipe and is used to control the opening and closing of the first drain valve. When the first drain valve is opened, the first drain pipe can discharge the supernatant in the water tank to the sewage treatment pool.
[0015] The second drain pipe is connected to the drain outlet, and the second drain valve is disposed on the second drain pipe and is used to control the opening and closing of the second drain valve. When the second drain valve is opened, the second drain pipe can drain the water in the water tank.
[0016] In one embodiment, both the first drain valve and the second drain valve are electric valves and are electrically connected to the controller. The controller is used to control the opening and closing of the first drain valve and the second drain valve, and the opening and closing response time of the first drain valve and the second drain valve is less than or equal to 2 seconds.
[0017] In one embodiment, a reflux valve and a flow meter are also included. Both the reflux valve and the flow meter are located on the internal reflux pipe. Both the reflux valve and the flow meter are electrically connected to the controller. The controller controls the opening degree of the reflux valve according to the water flow monitored by the flow meter.
[0018] In one embodiment, the flushing pipe has a plurality of spray holes, which are uniformly arranged along the axial direction of the flushing pipe, and the spacing between the spray holes is 1.2 to 1.5 times the inner diameter of the flushing pipe; and / or, the diameter of the spray holes is 5 mm to 8 mm.
[0019] In one embodiment, the axis of the injection hole is set at an angle of 25° to 35° downward relative to the horizontal plane.
[0020] On the other hand, this application provides a sewage treatment system, including a sewage treatment tank and a backwashing device as described above, wherein the sewage treatment tank is provided with an inlet and an outlet, and the water tank is disposed above the sewage treatment tank.
[0021] The aforementioned backwashing device and sewage treatment system include a water tank, a flushing pipe, an internal return pipe, and a water pump. Since the water pump can pump water from the sewage treatment tank to the flushing pipe through the internal return pipe, the flushing pipe can be used to backwash the inner wall of the water tank without interrupting the sewage treatment at the sewage treatment tank. This achieves the maintenance of sewage treatment while performing backwashing operations, thereby improving sewage treatment efficiency. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the structure of a wastewater treatment system according to one embodiment of this application.
[0024] Figure 2 This is a schematic diagram of the backwashing pipe in a wastewater treatment system according to one embodiment of this application.
[0025] Explanation of reference numerals in the attached figures:
[0026] 10. Backwashing device; 11. Water tank; 111. Drain outlet; 112. Overflow weir; 1121. Overflow port; 12. Flushing pipe; 121. Spray hole; 122. Plug; 13. Internal return pipe; 14. Water pump; 15. Turbidity sensor; 16. First drain pipe; 17. Second drain pipe; 18. First drain valve; 19. Second drain valve; 101. Return valve; 102. Flow meter; 20. Sewage treatment tank; 201. Inlet; 202. Outlet. Detailed Implementation
[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0028] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.
[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0033] Combination Figure 1 and Figure 2 As shown, one embodiment of this application provides a wastewater treatment system, including a backwashing device 10 and a wastewater treatment tank 20.
[0034] The backwashing device 10 includes a water tank 11, a flushing pipe 12, an internal return pipe 13, and a water pump 14. The water tank 11 has a drain outlet 111 at its bottom. The flushing pipe 12 is located inside the water tank 11 and has spray holes 121 for spraying water towards the inner wall of the water tank 11. One end of the internal return pipe 13 is connected to the flushing pipe 12, and the water pump 14 is connected to the other end of the internal return pipe 13. The water pump 14 pumps water from the wastewater treatment tank 20 through the internal return pipe 13 to the flushing pipe 12, thereby enabling backwashing of the inner wall of the water tank 11 using the flushing pipe 12 without interrupting wastewater treatment at the wastewater treatment tank 20. This achieves simultaneous backwashing and wastewater treatment, improving wastewater treatment efficiency.
[0035] Wastewater treatment tank 20 is used to treat wastewater. Wastewater treatment tank 20 is provided with inlet 201 and outlet 202. When wastewater is treated in the wastewater treatment system, wastewater can enter wastewater treatment tank 20 through inlet 201, and the water treated by wastewater treatment tank 20 can be discharged from outlet 202.
[0036] In some embodiments, the flushing pipe 12 has multiple spray holes 121, which are evenly arranged along the axial direction of the flushing pipe 12. The spacing between the spray holes 121 is 1.2 to 1.5 times the inner diameter of the flushing pipe 12. Testing has shown that this configuration provides good backwashing effect on the water tank 11. The number of spray holes 121 can be from 3 to 20. For example, the number of spray holes 121 can be 3, 5, 7, 8, 11, 13, 15, 18, or 20; the number of spray holes 121 is not limited here.
[0037] The diameter of the spray hole 121 is 5 mm to 8 mm. For example, the diameter of the spray hole 121 is 5 mm, 6 mm, 7 mm or 8 mm. In this embodiment, by setting the diameter of the spray hole 121 to 5 mm to 8 mm, the water jet from the spray hole 121 is sprayed at a suitable flow rate.
[0038] In some embodiments, the axis of the spray hole 121 is inclined downwards at an angle of 25° to 35° relative to the horizontal plane. For example, the angle of inclination of the axis of the spray hole 121 relative to the horizontal plane can be 25°, 27°, 28°, 29°, 30°, 33°, or 35°. In this embodiment, by setting the angle of the spray hole 121 relative to the horizontal plane, the spray hole 121 sprays water onto the inner wall of the water tank 11 at a suitable angle. This angle setting is beneficial for balancing the impact force of the water flow on the inner wall of the water tank 11 and the efficiency of the generated sewage flowing to the bottom of the water tank 11, thereby improving the flushing efficiency and further reducing the backwashing water consumption.
[0039] In some embodiments, at least one end of the flushing pipe 12 is provided with a plug 122. When a plug 122 is provided at one end of the flushing pipe 12, the other end of the flushing pipe 12 is connected to the internal return pipe 13. When plugs 122 are provided at both ends of the flushing pipe 12, connection ports can be provided at other locations on the flushing pipe 12 to connect to the internal return pipe 13. As long as the internal return pipe 13 supplies water to the flushing pipe 12, the water flow only needs to be sprayed out from the spray hole 121 of the flushing pipe 12.
[0040] In some embodiments, the water tank 11 is provided with an overflow weir 112, which has an overflow outlet 1121. The overflow outlet 1121 is used to overflow the upper clear liquid in the water tank 11 into the sewage treatment tank 20. The height of the overflow outlet 1121 of the overflow weir 112 is lower than the top of the water tank 11. Only when the water level in the water tank 11 exceeds the overflow weir 112 will the upper clear liquid in the water tank 11 overflow from the overflow outlet 1121 into the sewage treatment tank 20. It should be noted that the overflow outlet 1121 can be a connecting pipe, so that the upper clear liquid overflowing from the overflow weir 112 will flow into the sewage treatment tank 20 through the pipe.
[0041] Because the overflow port 1121 of the overflow weir 112 is lower than the top of the water tank 11, the supernatant can overflow from the overflow port 1121 before it overflows the top of the water tank 11.
[0042] The distance from the overflow port 1121 to the top of the water tank 11 is 10cm to 15cm. For example, the distance from the overflow port 1121 to the top of the water tank 11 can be 10cm, 15cm, 15cm, 15cm, 15cm, 15cm. With this structural arrangement, the space in the water tank 11 corresponding to the overflow port 1121 to the top of the water tank 11 can play a liquid storage role, so that when the overflow port 1121 does not have time to discharge the supernatant, the supernatant will not immediately overflow the top of the water tank 11.
[0043] In some embodiments, the water tank 11 is positioned above the sewage treatment tank 20, so that the upper clear liquid overflowing from the overflow port 1121 in the water tank 11 can flow into the sewage treatment tank 20 under its own gravity, without the need for a pump, thus saving energy.
[0044] In some embodiments, the backwashing device 10 further includes a turbidity sensor 15 and a controller. The turbidity sensor 15 is installed in the water tank 11 and is used to detect the turbidity value. Both the turbidity sensor 15 and the water pump 14 are electrically connected to the controller, which controls the start and stop of the water pump 14 according to the turbidity value. In this way, the operating conditions of the backwashing device 10 can be adjusted according to different turbidities to improve the effectiveness of the backwashing device 10.
[0045] For example, when the turbidity value detected by the turbidity sensor 15 is greater than or equal to 50 NTU, the controller controls the water pump 14 to stop pumping water to the flushing pipe 12, so that the water in the water tank 11 can be allowed to settle, allowing the suspended matter in the water to settle to the bottom of the water tank 11. Understandably, regardless of whether the water pump 14 stops pumping water to the flushing pipe 12, the sewage treatment tank 20 will not be affected, allowing the sewage treatment tank 20 to treat sewage normally and improve sewage treatment efficiency.
[0046] The backwashing device 10 also includes a first drain pipe 16, a second drain pipe 17, a first drain valve 18, and a second drain valve 19.
[0047] The first drain valve 18 is installed on the first drain pipe 16 and is used to control the opening and closing of the first drain valve 18. When the first drain valve 18 is open, the first drain pipe 16 can discharge the supernatant in the water tank 11 to the sewage treatment tank 20. In this way, the supernatant in the water tank 11 enters the sewage treatment tank 20, thereby reducing the amount of water in the water tank 11, which helps to reduce the amount of sewage generated during the subsequent backwashing of the water tank 11 and reduces the burden of subsequent sewage discharge.
[0048] The second drain pipe 17 is connected to the drain outlet 111, and the second drain valve 19 is installed on the second drain pipe 17 to control the opening and closing of the second drain valve 19. When the second drain valve 19 is opened, the second drain pipe 17 can drain the water in the water tank 11. In this embodiment, the water in the water tank 11 can be drained using the second drain pipe 17 to achieve the effect of sewage discharge. For example, after the water in the water tank 11 has been left to stand, a supernatant forms on the upper layer of the water tank 11. The supernatant is discharged to the sewage treatment tank 20 through the first drain pipe 16, leaving the remaining water in the water tank 11 as relatively turbid (which can be understood as sewage). Thus, after the second drain valve 19 is opened, this sewage will be discharged through the second drain pipe 17. This method of emptying the sewage at the bottom of the water tank 11 by gravity flow helps to reduce the amount of water used for subsequent backwashing of the water tank 11, i.e., the backwash water consumption.
[0049] In some embodiments, both the first drain valve 18 and the second drain valve 19 are electrically operated valves and are electrically connected to a controller. The controller controls the opening and closing of the first drain valve 18 and the second drain valve 19, and the opening and closing response time of the first drain valve 18 and the second drain valve 19 is less than or equal to 2 seconds. In this embodiment, since both the first drain valve 18 and the second drain valve 19 are electrically operated valves and the opening and closing response time is less than or equal to 2 seconds, they offer good controllability and fast response, which is beneficial for quickly responding to the corresponding operations of discharging supernatant and discharging sewage.
[0050] In some embodiments, the backwashing device 10 further includes a return valve 101 and a flow meter 102, both of which are located on the internal return pipe 13. Both the return valve 101 and the flow meter 102 are electrically connected to a controller, which controls the opening degree of the return valve 101 based on the water flow rate monitored by the flow meter 102. This allows the internal return pipe 13 to supply water to the flushing pipe 12 at a suitable flow rate.
[0051] To facilitate understanding, the backwashing device 10 will be further explained below in conjunction with its operating principle, but this does not mean that the use of the backwashing device 10 in this application is limited to this.
[0052] For example, in some embodiments, a 0.5m³ volume is provided at the top of the sewage treatment tank 20. 3 The water tank 11 has dimensions of 1 meter (length) * 1 meter (width) * 0.5 meters (height), and the height ratio of the water tank 11 to the depth of the sewage treatment tank 20 is 1:6. The spray nozzles 121 and flushing pipes 12 are made of U-PVC pipe with a diameter of DN32. Each side of the water tank 11 has a flushing pipe 12, and each flushing pipe 12 has 16 spray nozzles 121 with a diameter of 6mm. The angle of inclination of the spray nozzles 121 relative to the horizontal plane is 30°, and the spacing between the spray nozzles 121 is 6cm. The turbidity sensor 15 is an online laser scattering instrument with a range of 0 NTU ~ 500 NTU and an accuracy of ±2%FS.
[0053] In the initial state, the opening degree of the return valve 101 is controlled by the feedback parameters of the flow meter 102, so that the water pump 14 flows at a rate of less than 2.0 m / s. 3 Operating at a flow rate of / h, the upper clear liquid in water tank 11 is returned to sewage treatment pond 20 through overflow weir 112.
[0054] When the turbidity value exceeds 50 NTU for 5 consecutive minutes, the controller stops pumping water to the flushing pipe 12. This allows the water in the tank 11 to settle, for example, for 3 hours. After settling, the first drain valve 18 is opened, allowing the first drain pipe 16 to discharge the supernatant from the tank 11 to the wastewater treatment tank 20. It should be noted that the settling period in the tank 11 does not affect the normal wastewater treatment process of the wastewater treatment tank 20. Simultaneously, draining the supernatant reduces the amount of backwash water required.
[0055] Then, close the first drain valve 18 and open the second drain valve 19, allowing the second drain pipe 17 to discharge sewage from the bottom of the water tank 11. After the second drain pipe 17 has discharged the sewage from the bottom of the water tank 11, the water pump 14 can be started. The opening of the return valve 101 is controlled by the feedback parameters from the flow meter 102, so that the water pump 14 operates at a speed greater than 2.5m. 3The system operates at a flow rate of / h, thereby flushing the water tank 11 through the flushing pipe 12. The flushing time can be 5 minutes. It should be noted that during the flushing process of the water tank 11, the wastewater generated by the water flow cleaning the water tank 11 can be discharged through the second drain pipe 17. After the backwashing of the water tank 11 is completed, the second drain valve 19 can be closed, thereby ending the backwashing, and the water pump 14 can be restarted at a flow rate of less than 2.0m. 3 The system operates at a flow rate of / h to supply water to the water tank 11.
[0056] Testing has shown that the backwashing device 10 of this application improves wastewater treatment efficiency because the wastewater treatment tank 20 does not need to be interrupted during the backwashing of the water tank 11. Furthermore, compared to traditional timed and pressure-controlled backwashing methods, the backwashing device 10 of this application can reduce energy consumption by 30%, increase impurity removal rate by 20%, and reduce water consumption per backwash by more than 20%.
[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0058] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A backwashing device, characterized in that, include: A water tank, wherein the bottom of the water tank is provided with a drain outlet; A flushing pipe is disposed inside the water tank and has spray holes for spraying water toward the inner wall of the water tank; An internal return pipe, one end of which is connected to the flushing pipe; A water pump is connected to the other end of the internal return pipe and is used to pump water from the sewage treatment tank to the flushing pipe through the internal return pipe.
2. The backwashing device according to claim 1, characterized in that, The water tank is equipped with an overflow weir. The overflow outlet of the overflow weir is lower than the top of the water tank, and the distance from the overflow outlet to the top of the water tank is 10cm to 15cm. The overflow outlet is used to overflow the upper layer of clear liquid in the water tank into the sewage treatment pond.
3. The backwashing device according to claim 1 or 2, characterized in that, It also includes a turbidity sensor and a controller. The turbidity sensor is installed in the water tank and is used to detect the turbidity value. Both the turbidity sensor and the water pump are electrically connected to the controller, which is used to control the start and stop of the water pump according to the turbidity value.
4. The backwashing device according to claim 3, characterized in that, When the turbidity value detected by the turbidity sensor is greater than or equal to 50 NTU, the controller controls the water pump to stop pumping water into the flushing pipe.
5. The backwashing device according to claim 3, characterized in that, It also includes a first drain pipe, a second drain pipe, a first drain valve, and a second drain valve; The first drain valve is installed on the first drain pipe and is used to control the opening and closing of the first drain valve. When the first drain valve is opened, the first drain pipe can discharge the supernatant in the water tank to the sewage treatment pool. The second drain pipe is connected to the drain outlet, and the second drain valve is disposed on the second drain pipe and is used to control the opening and closing of the second drain valve. When the second drain valve is opened, the second drain pipe can drain the water in the water tank.
6. The backwashing device according to claim 5, characterized in that, Both the first drain valve and the second drain valve are electric valves and are electrically connected to the controller. The controller is used to control the opening and closing of the first drain valve and the second drain valve. The opening and closing response time of the first drain valve and the second drain valve is less than or equal to 2 seconds.
7. The backwashing device according to claim 3, characterized in that, It also includes a reflux valve and a flow meter, both of which are installed on the internal reflux pipe. Both the reflux valve and the flow meter are electrically connected to the controller, which controls the opening degree of the reflux valve according to the water flow monitored by the flow meter.
8. The backwashing device according to claim 1, characterized in that, The flushing pipe has a plurality of spray holes, which are evenly arranged along the axial direction of the flushing pipe, and the spacing between the spray holes is 1.2 to 1.5 times the inner diameter of the flushing pipe. And / or, the diameter of the injection hole is 5 mm to 8 mm.
9. The backwashing device according to claim 1 or 8, characterized in that, The axis of the injection hole is set at an angle of 25° to 35° downward relative to the horizontal plane.
10. A wastewater treatment system, characterized in that, It includes a sewage treatment tank and a backwashing device as described in any one of claims 1-7, wherein the sewage treatment tank is provided with an inlet and an outlet, and the water tank is disposed above the sewage treatment tank.