Efficient treatment equipment for industrial wastewater with medium and low COD (Chemical Oxygen Demand)
By employing a partition wall and rotary drive components in the aeration reaction tank, the wastewater and air are thoroughly mixed, solving the problem of uneven mixing and significantly improving COD reduction efficiency.
Patent Information
- Application Number
- CN202520052512.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing industrial wastewater treatment aeration reactors suffer from uneven mixing of air and wastewater, resulting in incomplete reactions and low COD reduction efficiency.
The aeration reaction tank is divided into sub-chambers by multiple partition walls. The design combines fixed and movable pipes, and the outlet orientation is changed by rotating drive components. Gas-liquid mixing is achieved by using a high-pressure gas generator and a mixing device to fully mix wastewater and air.
It improves the reaction efficiency of wastewater with air, especially when adding reactants or biological fillers, which accelerates the reaction process and significantly increases the rate of COD reduction.
Smart Images
Figure CN223837209U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of industrial wastewater treatment technology, specifically to a high-efficiency treatment device for medium- and low-COD industrial wastewater. Background Technology
[0002] Chemical Oxygen Demand (COD) is a chemically measured amount of reducing substances in a water sample that require oxidation. It represents the oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in wastewater, wastewater treatment plant effluent, and polluted water. In studies of river pollution and the properties of industrial wastewater, as well as in the operation and management of wastewater treatment plants, it is an important and relatively quick-to-measure parameter for organic pollution, often expressed by the symbol COD.
[0003] In industrial wastewater treatment, air is often introduced into the wastewater to utilize the oxygen in the air to react with reducing substances and reduce COD. Currently, in aeration reactors used for industrial wastewater treatment, air is simply introduced into the reactor through aeration pipes, resulting in uneven mixing of air and wastewater and incomplete reaction. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings and deficiencies in the existing technology and provide a high-efficiency treatment device for industrial wastewater with medium and low COD.
[0005] One embodiment of this utility model provides a high-efficiency treatment device for medium- and low-COD industrial wastewater, including: an aeration reaction tank, an aeration device, a control valve, a mixing device, and a high-pressure gas generating device;
[0006] The aeration reaction tank is provided with multiple partition walls, which divide the aeration reaction tank into multiple sub-chambers. Adjacent sub-chambers are connected by a connecting port located at the bottom of the sub-chamber.
[0007] The aeration device includes multiple fixed pipes, multiple movable pipes, and a rotary drive assembly. The fixed pipes are installed in the sub-chamber. The fixed pipes have several first outlets on their walls, which extend along the circumferential direction of the fixed pipes. The movable pipes are sleeved on the outside of the fixed pipes and have second outlets on them. The second outlets are connected to the first outlets. On a cross-section parallel to the fixed pipes, the central angle corresponding to the first outlet is greater than the central angle corresponding to the second outlet. The rotary drive assembly is driven by the movable pipes and is used to drive the movable pipes to reciprocate to change the orientation of the second outlets.
[0008] The high-pressure gas generating device is connected to the mixing device and is used to deliver high-pressure air into the mixing device.
[0009] The control valve is connected to the mixing device, the mixing device is connected to the fixed pipe, and a return water inlet is also provided in the aeration reaction tank. The mixing device is also connected to the return water inlet through a water pump.
[0010] In some optional embodiments, the fixed pipe is provided with a plurality of first water outlets, and the plurality of first water outlets are arranged sequentially around the circumference of the fixed pipe.
[0011] The movable pipe is provided with a plurality of second water outlets, which are arranged sequentially around the circumference of the movable pipe.
[0012] In some alternative embodiments, the central angle corresponding to the first outlet on a cross section parallel to the fixed pipe is not less than 20° and not more than 90°.
[0013] In some alternative embodiments, the central angle corresponding to the second outlet on a cross section parallel to the fixed pipe is not less than 5° and not more than 15°.
[0014] In some alternative embodiments, the first outlet is located in the lower half of the fixed pipe.
[0015] In some alternative embodiments, the aeration reaction tank is provided with a drain outlet, and the bottom of the aeration reaction tank gradually slopes downward in the direction close to the drain outlet.
[0016] In some optional embodiments, the mixing device includes a body and a mixing cavity disposed within the body. The mixing cavity includes a first cavity, a second cavity, and a third cavity connected in sequence. The inner diameter of the first cavity gradually increases in the direction close to the second cavity, and the inner diameter of the third cavity gradually decreases in the direction away from the second cavity. The high-pressure gas generating device is connected to the first cavity.
[0017] Both the control valve and the water pump are connected to the first cavity.
[0018] In some optional embodiments, the mixing chamber further includes a water inlet chamber, which is connected to the first chamber, the high-pressure gas generating device is connected to the water inlet chamber, and the control valve and the water pump are both connected to the water inlet chamber.
[0019] In some optional embodiments, the main body is provided with a plurality of mixing chambers, which are connected in sequence, and in the wastewater conveying direction, the third chamber of the mixing chamber is connected to the first chamber of the next adjacent mixing chamber.
[0020] In some optional embodiments, the water inlet cavity is provided with multiple air inlets, which are arranged sequentially in the circumferential direction around the water inlet cavity, and the high-pressure gas generating device is connected to the air inlets.
[0021] Compared to existing technologies, this utility model's high-efficiency treatment equipment for medium- and low-COD industrial wastewater pre-mixes the wastewater with air, resulting in more thorough mixing and improved reaction efficiency. The wastewater and air mixture is then introduced into the aeration reaction tank. By continuously changing the angle of the second outlet, the wastewater in the aeration reaction tank is constantly agitated, further enhancing reaction efficiency. Especially when reactants or biological fillers are pre-added to the wastewater, the reaction with the reactants or the contact between the biological fillers and the wastewater is accelerated, effectively speeding up the COD reduction rate.
[0022] To provide a clearer understanding of this invention, the specific embodiments of the invention will be described below in conjunction with the accompanying drawings. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of a high-efficiency treatment device for medium- and low-COD industrial wastewater according to an embodiment of the present invention.
[0024] Figure 2 This is a cross-sectional view of an aeration reaction tank and aeration device according to an embodiment of the present invention;
[0025] Figure 3 This is a schematic diagram of the top structure of the aeration reaction tank and aeration device according to an embodiment of the present invention;
[0026] Figure 4 This is a cross-sectional view of the fixed tube and the movable tube in one embodiment of the present invention, on a section parallel to the fixed tube.
[0027] Figure 5 This is a cross-sectional view of a fixed tube and a movable tube in one embodiment of the present invention, on a section parallel to the fixed tube and after the movable tube has been rotated.
[0028] Figure 6 This is a partial exploded view of the fixed tube and the movable tube according to an embodiment of the present invention;
[0029] Figure 7 This is a cross-sectional view of a mixing device according to an embodiment of the present invention.
[0030] Explanation of reference numerals in the attached figures:
[0031] 10. Aeration reaction tank; 11. Dividing wall; 12. Sub-chamber; 13. Connecting port; 14. Drain outlet; 20. Aeration device; 21. Fixed pipe; 211. First outlet; 22. Movable pipe; 221. Second outlet; 23. Rotary drive assembly; 30. Control valve; 40. Mixing device; 41. Body; 42. Mixing chamber; 43. First chamber; 44. Second chamber; 45. Third chamber; 46. Water inlet chamber; 47. Air inlet; 50. High-pressure gas generating device; 60. Water pump. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. In the description of the present utility model, unless otherwise stated, "a plurality of" means two or more, and "a number" means one or more. In addition, unless otherwise stated, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.
[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 utility model.
[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0035] In the description of this utility model, references to terms such as "one embodiment," "some alternative implementations," or "some optional embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0036] Please see Figure 1 One embodiment of this utility model provides a high-efficiency treatment device for medium and low COD industrial wastewater, including: an aeration reaction tank 10, an aeration device 20, a control valve 30, a mixing device 40, and a high-pressure gas generating device 50.
[0037] The aeration reaction tank 10 is provided with multiple partition walls 11, which divide the aeration reaction tank 10 into multiple sub-chambers 12. Adjacent sub-chambers 12 are connected by a connecting port 13, which is located at the bottom of the sub-chamber 12.
[0038] The aeration device 20 includes multiple fixed pipes 21, multiple movable pipes 22, and a rotary drive assembly 23. The fixed pipes 21 are installed in the sub-chamber 12. The fixed pipes 21 have a number of first outlets 211 on their walls. The first outlets 211 extend in the circumferential direction of the fixed pipes 21. The movable pipes 22 are sleeved on the outside of the fixed pipes 21. The movable pipes 22 have second outlets 221 on them. The second outlets 221 are connected to the first outlets 211. On the cross section parallel to the fixed pipes 21, the central angle corresponding to the first outlets 211 is greater than the central angle corresponding to the second outlets 221. The rotary drive assembly 23 is driven to connect with the movable pipes 22 and is used to drive the movable pipes 22 to rotate back and forth to change the orientation of the second outlets 221.
[0039] The high-pressure gas generating device 50 is connected to the mixing device 40 and is used to deliver high-pressure air into the mixing device 40.
[0040] The control valve 30 is connected to the mixing device 40, which is connected to the fixed pipe 21. The aeration reaction tank 10 is also equipped with a return water port, and the mixing device 40 is also connected to the return water port through the water pump 60.
[0041] When wastewater treatment begins, control valve 30 is opened and pump 60 is closed. Wastewater enters mixing device 40 through control valve 30. As wastewater passes through mixing device 40, it mixes with high-pressure air generated by high-pressure gas generator 50, filling the wastewater with tiny bubbles. The wastewater then enters fixed pipe 21, sequentially passing through first outlet 211 and second outlet 221, before entering sub-chamber 12. After reaching a suitable water level in aeration reaction tank 10, control valve 30 is closed. At this point, the wastewater needs time to react and reduce COD. Pump 60 is then activated, continuously pumping wastewater from aeration reaction tank 10 to mixing device 40, mixing the wastewater with a large amount of high-pressure air. The wastewater then returns to aeration reaction tank 10. Compared to directly supplying high-pressure air to aeration reaction tank 10, which generates larger bubbles, gas-liquid mixing helps reduce bubble volume, accelerates the reaction rate, and better agitates the wastewater. Furthermore, the second inlet can be rotated back and forth by the rotary drive assembly 23, causing the wastewater to churn within the sub-chamber 12, further enhancing the rate of COD reduction. Additionally, the arrangement of multiple sub-chambers 12 facilitates the treatment of large volumes of wastewater.
[0042] The rotary drive assembly 23 can be driven by a geared motor, or other suitable drive assemblies can be used, without limitation to this example.
[0043] In some optional embodiments, the fixed pipe 21 is provided with a plurality of first outlets 211, which are arranged sequentially around the circumference of the fixed pipe 21; the movable pipe 22 is provided with a plurality of second outlets 221, which are arranged sequentially around the circumference of the movable pipe 22. The plurality of second outlets 221 can increase the outlet direction, which is beneficial to further agitate and churn the wastewater in the sub-chamber 12.
[0044] In some alternative embodiments, the first outlet 211 is located on the lower half of the fixed pipe 21. In this embodiment, the fixed pipe 21 is provided with two first outlets 211, which are located on both sides of the lower half of the fixed pipe 21. The movable pipe 22 is provided with two corresponding second outlets 221, and the first outlets 211 and the second outlets 221 are connected to each other.
[0045] In some optional embodiments, on a cross-section parallel to the fixed pipe 21, the central angle corresponding to the first outlet 211 is not less than 20° and not more than 90°. For example, the central angle corresponding to the first outlet 211 can be 30°, 45°, or 60°. In some optional embodiments, on a cross-section parallel to the fixed pipe 21, the central angle corresponding to the second outlet 221 is not less than 5° and not more than 15°. For example, the central angle corresponding to the second outlet 221 can be 12°, 10°, or 8°.
[0046] In some alternative embodiments, the aeration reaction tank 10 is provided with a drain outlet 14, and the bottom of the aeration reaction tank 10 gradually slopes downward in the direction close to the drain outlet 14, so as to facilitate the discharge of wastewater from the drain outlet 14 after treatment.
[0047] In some optional embodiments, the mixing device 40 includes a body 41 and a mixing chamber 42 disposed within the body 41. The mixing chamber 42 includes a first chamber 43, a second chamber 44, and a third chamber 45 connected in sequence. The inner diameter of the first chamber 43 gradually increases towards the second chamber 44, and the inner diameter of the third chamber 45 gradually decreases away from the second chamber 44. The high-pressure gas generating device 50 is connected to the first chamber 43. The control valve 30 and the water pump 60 are both connected to the first chamber 43. Wastewater entering the first chamber 43 through the control valve 30 or the water pump 60 easily generates swirling flow between the high-pressure air and the wastewater in the first chamber 43, the second chamber 44, and the third chamber 45, which is beneficial for shearing larger air bubbles into smaller air bubbles. In particular, when the water pump 60 delivers wastewater to the first chamber 43, the ratio of high-pressure air to wastewater can be adjusted by controlling the amount of wastewater delivered, so as to better utilize the swirling wastewater to cut the air bubbles, thereby outputting dense air bubbles at the second outlet 221, resulting in a better aeration effect.
[0048] In some optional embodiments, the mixing chamber 42 further includes a water inlet chamber 46, which is connected to the first chamber 43. The high-pressure gas generating device 50 is also connected to the water inlet chamber 46, as are the control valve 30 and the water pump 60. The inner diameter of the water inlet chamber 46 should be equal to the minimum inner diameter of both the first chamber 43 and the second chamber 44. The water inlet chamber 46 is used to increase water pressure, which facilitates the creation of swirling flow.
[0049] To increase gas-liquid mixing and further break up bubbles to form a large number of dense bubbles, in some optional embodiments, the main body 41 is provided with multiple mixing chambers 42, which are sequentially connected. In the wastewater conveying direction, the third chamber 45 of the mixing chamber 42 is connected to the first chamber 43 of the next adjacent mixing chamber 42. In this embodiment, the third chamber 45 of the mixing chamber 42 is connected to the inlet chamber 46 of the next adjacent mixing chamber 42. The control valve 30 and the water pump 60 are both connected to the inlet chamber 46 of the first mixing chamber 42 in the wastewater conveying direction.
[0050] In some alternative embodiments, the water inlet chamber 46 is provided with a plurality of air inlets 47, which are arranged sequentially in the circumferential direction around the water inlet chamber 46. The high-pressure gas generating device 50 is connected to the air inlets 47, and the plurality of air inlets 47 is beneficial to improving the gas-liquid mixing degree.
[0051] In addition, a check valve can be installed between the water pump 60 and the return water inlet to prevent wastewater backflow. Furthermore, when the wastewater in the aeration reaction tank 10 reaches a suitable level, the water pump 60 can be left running as needed, allowing high-pressure air to be discharged directly through the second outlet 221 without mixing with the wastewater.
[0052] In addition, depending on actual needs, wastewater can also be pre-added with reactants, catalysts, biological fillers, etc., and then transported to the aeration reaction tank 10 for reaction.
[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A high-efficiency treatment device for low-to-medium COD industrial wastewater, characterized in that, include: Aeration reaction tank, aeration device, control valve, mixing device and high-pressure gas generating device; The aeration reaction tank is provided with multiple partition walls, which divide the aeration reaction tank into multiple sub-chambers. Adjacent sub-chambers are connected by a connecting port located at the bottom of the sub-chamber. The aeration device includes multiple fixed pipes, multiple movable pipes, and a rotary drive assembly. The fixed pipes are installed in the sub-chamber. The fixed pipes have several first outlets on their walls, which extend along the circumferential direction of the fixed pipes. The movable pipes are sleeved on the outside of the fixed pipes and have second outlets on them. The second outlets are connected to the first outlets. On a cross-section parallel to the fixed pipes, the central angle corresponding to the first outlet is greater than the central angle corresponding to the second outlet. The rotary drive assembly is driven by the movable pipes and is used to drive the movable pipes to reciprocate to change the orientation of the second outlets. The high-pressure gas generating device is connected to the mixing device and is used to deliver high-pressure air into the mixing device. The control valve is connected to the mixing device, the mixing device is connected to the fixed pipe, and a return water inlet is also provided in the aeration reaction tank. The mixing device is also connected to the return water inlet through a water pump.
2. The high-efficiency treatment equipment for medium- and low-COD industrial wastewater according to claim 1, characterized in that: The fixed pipe is provided with a plurality of first water outlets, which are arranged sequentially around the circumference of the fixed pipe. The movable pipe is provided with a plurality of second water outlets, which are arranged sequentially around the circumference of the movable pipe.
3. The high-efficiency treatment equipment for medium- and low-COD industrial wastewater according to claim 1, characterized in that: On a cross-section parallel to the fixed pipe, the central angle corresponding to the first outlet is not less than 20° and not more than 90°.
4. The high-efficiency treatment equipment for medium- and low-COD industrial wastewater according to claim 3, characterized in that: On a cross-section parallel to the fixed pipe, the central angle corresponding to the second outlet is not less than 5° and not more than 15°.
5. The high-efficiency treatment equipment for medium- and low-COD industrial wastewater according to claim 1, characterized in that: The first water outlet is located in the lower half of the fixed pipe.
6. A high-efficiency treatment device for medium- and low-COD industrial wastewater according to any one of claims 1 to 5, characterized in that: The aeration reaction tank is equipped with a drain outlet, and the bottom of the aeration reaction tank gradually slopes downwards in the direction close to the drain outlet.
7. A high-efficiency treatment device for low-to-medium COD industrial wastewater according to any one of claims 1 to 5, characterized in that: The mixing device includes a body and a mixing cavity disposed within the body. The mixing cavity includes a first cavity, a second cavity, and a third cavity connected in sequence. The inner diameter of the first cavity gradually increases in the direction close to the second cavity, and the inner diameter of the third cavity gradually decreases in the direction away from the second cavity. The high-pressure gas generating device is connected to the first cavity. Both the control valve and the water pump are connected to the first cavity.
8. The high-efficiency treatment equipment for medium- and low-COD industrial wastewater according to claim 7, characterized in that: The mixing chamber also includes a water inlet chamber, which is connected to the first chamber. The high-pressure gas generating device is connected to the water inlet chamber, and the control valve and the water pump are both connected to the water inlet chamber.
9. A high-efficiency treatment device for medium- and low-COD industrial wastewater according to claim 8, characterized in that: The main body is provided with a plurality of mixing chambers, which are connected in sequence. In the wastewater conveying direction, the third chamber of the mixing chamber is connected to the first chamber of the next adjacent mixing chamber.
10. A high-efficiency treatment device for medium- and low-COD industrial wastewater according to claim 8, characterized in that: The water inlet chamber is provided with multiple air inlets, which are arranged sequentially around the circumference of the water inlet chamber. The high-pressure gas generating device is connected to the air inlets.