Reaction device for removing COD (Chemical Oxygen Demand) of nanofiltration membrane strong brine
By introducing a stirring component, an aeration component, and a chemical spraying component into the reaction device, the problem of uneven mixing of chemical solution and wastewater in nanofiltration membrane brine was solved, achieving a highly efficient COD removal effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-03
AI Technical Summary
Existing reaction devices, when treating concentrated brine from nanofiltration membranes, suffer from uneven mixing of reagents and wastewater, and insufficient reaction, resulting in unstable COD removal efficiency. In particular, microbial activity is inhibited in high-salt environments, making it difficult to meet the requirement of efficient COD removal.
A reaction device including a stirring component, an aeration component, and a liquid spraying component was designed. The stirring motor drives the stirring shaft and blades to stir, the aeration fan provides oxygen, and the liquid spraying component ensures uniform spraying of the liquid, thereby improving the mixing uniformity and mass transfer efficiency.
This method achieves efficient mixing of the chemical solution and wastewater, improves COD removal efficiency, ensures the reaction process proceeds fully, and enhances the treatment effect.
Smart Images
Figure CN224077151U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of wastewater treatment devices, and more specifically, to a reaction device for COD removal from concentrated brine using nanofiltration membranes. Background Technology
[0002] With the rapid development of industry and the increasing severity of water shortage, nanofiltration membrane technology has been widely used in wastewater treatment and reuse. Nanofiltration membranes can effectively remove organic matter, divalent ions and other substances in water. However, in the process of treating saline wastewater, nanofiltration membranes also produce a large amount of concentrated brine, which usually contains a high concentration of chemical oxygen demand (COD). If discharged directly, it will cause serious pollution to the environment.
[0003] Currently, the main methods for removing COD from concentrated brine using nanofiltration membranes are biological treatment and chemical oxidation. However, biological treatment methods suffer from inhibited microbial activity in high-salt environments, resulting in low treatment efficiency and difficulty in achieving satisfactory treatment effects. In contrast, chemical oxidation methods have the advantage of higher treatment efficiency compared to biological treatment methods.
[0004] When treating concentrated brine using chemical oxidation, the process is typically carried out within a dedicated reaction apparatus. However, existing reaction apparatuses for treating nanofiltration brine generally rely on the addition of reagents and wastewater into tanks, allowing the reaction to proceed based on the fluidity of the liquids. This approach suffers from drawbacks such as uneven mixing of reagents and wastewater, incomplete reaction, and unstable treatment results, making it difficult to meet the requirements for efficient COD removal. In particular, the inability to aerate during the reaction process hinders the provision of sufficient air to promote liquid mixing and mass transfer, thus affecting the treatment effect. Therefore, we propose a reaction apparatus for COD removal from nanofiltration brine. Utility Model Content
[0005] The purpose of this invention is to provide a reaction apparatus for COD removal from concentrated brine using nanofiltration membranes, thereby addressing the deficiencies mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] A reaction apparatus for COD removal from concentrated brine using nanofiltration membranes includes a reaction tank. A wastewater pipe is fixedly installed on the top of the reaction tank. A conical hopper is fixedly installed at the bottom of the reaction tank, and a discharge pipe is fixedly installed at the bottom of the conical hopper. A discharge valve is fixedly installed on the discharge pipe. A top cover is detachably connected to the top surface of the reaction tank. Two symmetrical stirring assemblies are provided on the top cover. Each stirring assembly includes a stirring motor fixedly installed on the top surface of the top cover. A vertically downward-oriented stirring shaft is fixedly installed at the end of the output shaft of the stirring motor. Multiple sets of stirring blades are fixedly installed on the stirring shaft, and the stirring blades are located inside the reaction tank. An aeration assembly is provided on the reaction tank, and the aeration assembly includes an aeration blower for aeration operation inside the reaction tank.
[0008] Preferably, a water flushing pipe is fixedly installed on the top of the reaction vessel, and a valve is fixedly installed on the water flushing pipe.
[0009] Preferably, an exhaust pipe is fixedly installed on the top cover, and the exhaust pipe is connected to an external waste gas treatment device.
[0010] Preferably, an air vent pipe is fixedly installed at the air outlet end of the aeration blower, and multiple vertical pipes are fixedly installed at the bottom of the air vent pipe. The vertical pipes pass through the top cover and are inserted into the reaction tank.
[0011] This setting ensures that air is introduced into the reaction vessel more evenly.
[0012] Preferably, the vertical tube is located in the middle of the two stirring shafts, and the bottom of the vertical tube is provided with multiple air outlets that communicate with the outside.
[0013] Preferably, the reaction tank is equipped with a liquid spraying assembly for spraying the liquid. The liquid spraying assembly includes a delivery pump located on one side of the reaction tank. A suction pipe is fixedly installed at the inlet end of the delivery pump, and an outlet pipe is fixedly installed at the outlet end of the delivery pump. An outlet ring pipe is fixedly installed at the end of the outlet pipe. The outlet ring pipe is located near the top of the reaction tank. The front and rear sides of the outlet ring pipe are connected by two symmetrical guide pipes. Spray nozzles are fixedly installed at the bottom of both the outlet ring pipe and the guide pipe.
[0014] This setting ensures that the liquid medicine is sprayed evenly into the reaction vessel and reacts with the liquid medicine inside.
[0015] Preferably, a gap is provided between the two conductive tubes, and the vertical tube is inserted along the gap.
[0016] Preferably, a axial gap is provided between the two sides of the guide tube and the liquid outlet ring tube, and the stirring shaft is inserted along the axial gap.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] 1. This utility model, by setting up a left-right symmetrical stirring assembly, with the stirring motor driving the stirring shaft and stirring blades to rotate, can fully stir the concentrated brine and reagents in the reaction tank, so that the reagents are evenly dispersed in the concentrated brine, achieving efficient mixing of the reagents and wastewater, thereby improving the uniformity and completeness of the reaction and thus improving the COD removal efficiency.
[0019] 2. This utility model, by setting up an aeration component, uses an aeration blower to aerate the reaction tank through an air pipe and a vertical pipe. The air outlet at the bottom of the vertical pipe evenly disperses the air in the concentrated brine, providing the oxygen required for the reaction. At the same time, it further promotes the mixing and mass transfer of the liquid, thus achieving the purpose of providing sufficient air for the reaction process, ensuring the efficient progress of the reaction, and improving the treatment effect.
[0020] 3. This utility model, by setting up a liquid spraying assembly, uses a delivery pump to draw the agent through a suction pipe, and then sprays the agent evenly into the concentrated brine through an outlet pipe, an outlet ring pipe, a guide pipe, and a nozzle. This allows the agent to come into contact with the concentrated brine more quickly and evenly, achieving efficient dispersion of the agent, thereby improving reaction efficiency and further enhancing the COD removal effect. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0022] Figure 2 This is a schematic diagram of the exploded structure of this utility model;
[0023] Figure 3 This is a schematic diagram of the structure of the liquid spraying assembly of this utility model;
[0024] Figure 4 This is a schematic diagram of the structure of the aeration component of this utility model;
[0025] The meanings of the labels in the diagram are as follows:
[0026] 1. Reaction vessel; 10. Conical hopper; 11. Discharge pipe; 12. Discharge valve; 13. Sewage pipe; 14. Water flushing pipe; 141. Valve; 15. Top cover; 16. Exhaust pipe;
[0027] 2. Mixing assembly; 20. Mixing motor; 21. Mixing shaft; 22. Mixing blades;
[0028] 3. Aeration components; 30. Aeration blower; 31. Ventilation pipe; 32. Vertical pipe; 33. Air outlet;
[0029] 4. Liquid spraying assembly; 40. Delivery pump; 41. Suction pipe; 42. Discharge pipe; 43. Discharge ring pipe; 44. Conductor pipe; 45. Nozzle; 46. Pipe gap; 47. Shaft gap. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 protection scope of the present utility model.
[0031] Please see Figures 1-4 This utility model provides a technical solution: a reaction device for COD removal of concentrated brine from nanofiltration membranes, including a reaction tank 1. A sewage pipe 13 is fixedly installed on the top of the reaction tank 1, so that the concentrated brine from the nanofiltration membrane can enter the reaction tank 1 conveniently and stably. A conical hopper 10 is fixedly installed at the bottom of the reaction tank 1, and a discharge pipe 11 is fixedly installed at the bottom of the conical hopper 10. A discharge valve 12 is fixedly installed on the discharge pipe 11, which facilitates the centralized collection and discharge of concentrated brine after the reaction, and ensures the smooth flow of liquid in and out of the reaction device.
[0032] like Figure 1 and Figure 2 As shown, a top cover 15 is detachably connected to the top surface of the reaction vessel 1. Two symmetrical stirring components 2 are provided on the top cover 15. The stirring components 2 include a stirring motor 20 fixedly installed on the top surface of the top cover 15. A stirring shaft 21 arranged vertically downward is fixedly installed at the end of the output shaft of the stirring motor 20. Multiple sets of stirring blades 22 are fixedly installed on the stirring shaft 21. The stirring blades 22 are located inside the reaction vessel 1. The stirring motor 20 drives the stirring shaft 21 and the stirring blades 22 to rotate, so that the concentrated brine and the reagent in the reaction vessel 1 are fully mixed, which enhances the mass transfer efficiency between liquids and effectively improves the sufficiency and uniformity of the COD removal reaction.
[0033] like Figure 1 As shown, a water flushing pipe 14 is fixedly installed on the top tank of the reaction vessel 1. The water flushing pipe 14 is connected to an external water supply pipeline. A valve 141 is fixedly installed on the water flushing pipe 14. When the reaction is completed or the device needs to be cleaned, the valve 141 is opened, and the inside of the reaction vessel 1 can be quickly and effectively flushed using the water flushing pipe 14 to maintain the cleanliness of the device and ensure the effect of subsequent treatment.
[0034] like Figure 1 As shown, an exhaust pipe 16 is fixedly installed on the top cover 15. The exhaust pipe 16 is connected to an external waste gas treatment device to connect the waste gas generated during the reaction process to the external waste gas treatment device, so as to avoid the waste gas from accumulating in the reaction tank 1 and causing abnormal pressure, and at the same time prevent the waste gas from leaking out and polluting the environment, and ensure that the reaction is carried out in a safe and stable environment.
[0035] like Figure 1 , Figure 2 and Figure 4 As shown, an aeration assembly 3 is provided on the reaction tank 1. The aeration assembly 3 includes an aeration blower 30 for aeration of the reaction tank 1. An air vent pipe 31 is fixedly installed at the air outlet of the aeration blower 30. Multiple vertical pipes 32 are fixedly installed at the bottom of the air vent pipe 31. The vertical pipes 32 pass through the top cover 15 and are inserted into the reaction tank 1, which can ensure that the air entering the reaction tank 1 is more uniform. The vertical pipes 32 are located in the middle of the two stirring shafts 21. Multiple air outlets 33 connected to the outside are provided on the bottom of the vertical pipe 32. The air generated by the aeration blower 30 is evenly distributed into the reaction tank 1 through the air vent pipe 31 and the vertical pipes 32 and the air outlets 33. This not only provides sufficient oxygen for the oxidation reaction, but also further promotes liquid mixing and mass transfer. Moreover, the vertical pipes 32 are located in the middle of the two stirring shafts 21 and work in conjunction with the stirring assembly 2 to significantly improve the mixing effect.
[0036] In this embodiment, the reaction tank 1 is equipped with a liquid spraying assembly 4 for liquid spraying. The liquid spraying assembly 4 includes a delivery pump 40 located on one side of the reaction tank 1. A suction pipe 41 is fixedly installed at the inlet end of the delivery pump 40, and an outlet pipe 42 is fixedly installed at the outlet end of the delivery pump 40. An outlet ring pipe 43 is fixedly installed at the end of the outlet pipe 42. The outlet ring pipe 43 is located near the top of the reaction tank 1. The front and rear sides of the outlet ring pipe 43 are connected by two symmetrical guide pipes 44. A nozzle 45 is fixedly installed at the bottom of both the outlet ring pipe 43 and the guide pipe 44. After the delivery pump 40 draws the agent, the agent is evenly sprayed into the reaction tank 1 through the nozzles 45 via various components, so that the agent and the concentrated brine come into rapid and sufficient contact. Compared with the traditional dosing method, the agent dispersion efficiency and reaction rate are greatly improved.
[0037] Specifically, a pipe gap 46 is provided between the two guide pipes 44, and the vertical pipe 32 is inserted along the pipe gap 46. A shaft gap 47 is provided between the guide pipe 44 and the two sides of the liquid outlet ring pipe 43, and the stirring shaft 21 is inserted along the shaft gap 47. This allows the vertical pipe 32 and the stirring shaft 21 to be reasonably interwoven and installed, avoiding spatial interference between the aeration component 3, the stirring component 2 and the liquid spraying component 4, ensuring that each component operates in coordination within the reaction tank 1, and optimizing the overall structural layout of the device.
[0038] Finally, it should be noted that the stirring motor 20, aeration blower 30, and conveying pump 40 involved in this utility model are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the spare parts of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and the matching controller and power supply, are connected by wires. The specific connection method should refer to the working principle of this utility model. The electrical connections between each electrical component are completed in the order of operation. The detailed connection methods are all technologies known in the art.
[0039] When using the reaction device for COD removal of concentrated brine by nanofiltration membrane, the wastewater pipe 13 is first connected to an external wastewater discharge pipe with a valve control, allowing the concentrated brine from the nanofiltration membrane to enter the reaction tank 1 through the wastewater pipe 13. Then, the delivery pump 40 is started, and the reagent is drawn through the suction pipe 41. The reagent is then evenly sprayed into the reaction tank 1 through the outlet pipe 42, outlet ring pipe 43, and guide pipe 44, and sprayed evenly through the nozzle 45. Subsequently, the stirring motor 20 is turned on, and the stirring shaft 21 drives the stirring blades 22 to rotate, so that the concentrated brine and the reagent are fully mixed. At the same time, the aeration blower 30 is started, and air is evenly dispersed into the reaction tank 1 through the air pipe 31 and vertical pipe 32, and through the air outlet 33, providing oxygen for the reaction and promoting mixing and mass transfer.
[0040] The waste gas generated by the reaction is discharged to the external waste gas treatment equipment through the exhaust pipe 16. After the reaction is completed, the discharge valve 12 is opened, and the treated concentrated brine is discharged through the conical hopper 10 and the discharge pipe 11.
[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A reaction apparatus for COD removal from concentrated brine using nanofiltration membranes, comprising a reaction vessel (1), characterized in that: A sewage pipe (13) is fixedly installed on the top tank of the reaction tank (1). A conical bucket (10) is fixedly installed at the bottom of the reaction tank (1). A discharge pipe (11) is fixedly installed at the bottom of the conical bucket (10). A discharge valve (12) is fixedly installed on the discharge pipe (11). A top cover (15) is detachably connected to the top surface of the reaction tank (1). Two symmetrical stirring components (2) are provided on the top cover (15). The stirring components (2) include a stirring motor (20) fixedly installed on the top surface of the top cover (15). A stirring shaft (21) is fixedly installed at the end of the output shaft of the stirring motor (20) and is arranged vertically downward. Multiple sets of stirring blades (22) are fixedly installed on the stirring shaft (21). The stirring blades (22) are located inside the reaction tank (1). An aeration component (3) is provided on the reaction tank (1). The aeration component (3) includes an aeration blower (30) for aeration operation towards the reaction tank (1).
2. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 1, characterized in that: A water flushing pipe (14) is fixedly installed on the top tank of the reaction vessel (1), and a valve (141) is fixedly installed on the water flushing pipe (14).
3. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 1, characterized in that: An exhaust pipe (16) is fixedly installed on the top cover (15), and the exhaust pipe (16) is connected to an external waste gas treatment device.
4. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 1, characterized in that: The aeration blower (30) has a fixed air pipe (31) installed at its air outlet. Multiple vertical pipes (32) are fixedly installed at the bottom of the air pipe (31). The vertical pipes (32) pass through the top cover (15) and are inserted into the reaction tank (1).
5. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 4, characterized in that: The vertical tube (32) is located in the middle of the two stirring shafts (21), and the bottom of the vertical tube (32) is provided with a number of air outlets (33) that are connected to the outside.
6. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 4, characterized in that: The reaction tank (1) is provided with a liquid spraying assembly (4) for spraying liquid. The liquid spraying assembly (4) includes a delivery pump (40) located on one side of the reaction tank (1). A suction pipe (41) is fixedly installed at the inlet end of the delivery pump (40). A liquid outlet pipe (42) is fixedly installed at the outlet end of the delivery pump (40). A liquid outlet ring pipe (43) is fixedly installed at the end of the liquid outlet pipe (42). The liquid outlet ring pipe (43) is located near the top of the reaction tank (1). The front and rear sides of the liquid outlet ring pipe (43) are connected by two symmetrical guide pipes (44). A nozzle (45) is fixedly installed at the bottom of both the liquid outlet ring pipe (43) and the guide pipe (44).
7. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 6, characterized in that: A tube gap (46) is provided between the two conductive tubes (44), and the vertical tube (32) is inserted along the tube gap (46).
8. The reaction apparatus for COD removal from concentrated brine via nanofiltration membrane according to claim 7, characterized in that: A shaft gap (47) is provided between the two sides of the conductive pipe (44) and the liquid outlet ring pipe (43), and the stirring shaft (21) is inserted along the shaft gap (47).