Multistage oxidation equipment for organic wastewater
Patent Information
- Application Number
- CN202522295978.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-30
AI Technical Summary
湿式氧化工艺，该工艺在高温、高压的条件下可将废水中的有机物氧化为小分子无机物，具备应用范围广、氧化速率快、二次污染轻微等优点，但是成本高，设备使用要求严格
与现有技术相比，本实用新型设置多级氧化组件，正常工作时，废水通过进液总管、支管送入各个氧化组件中，单独进行氧化反应，当废水COD含量较高，单次氧化不彻底时，可通过循环控制管串联氧化组件，将处理过的废水送入二级氧化组件，进行二次氧化反应，确保有机物去除率。
Smart Images
Figure CN224798639U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of organic wastewater treatment technology, and in particular to a multi-stage oxidation device for organic wastewater. Background Technology
[0002] Currently, organic wastewater treatment typically employs methods such as biofilm processes, aerobic activated sludge processes, and ozone oxidation, among which wet oxidation (WAO) has seen the most rapid development. Wet oxidation, under high temperature and pressure conditions, can oxidize organic matter in wastewater into smaller inorganic molecules. It boasts advantages such as wide applicability, rapid oxidation rate, and minimal secondary pollution; however, it is costly and requires strict equipment specifications.
[0003] For wastewater with COD between 20,000 and 100,000 mg / L, micro-evaporation liquid phase oxidation technology can be used. The oxidation reaction does not require high temperature and high pressure, has low equipment requirements, and low cost. However, due to the limitation of oxidant or reaction temperature, the wastewater in the reaction tank may not be completely oxidized, which will affect the removal of organic matter. Utility Model Content
[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage oxidation device for organic wastewater.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A multi-stage oxidation device for organic wastewater includes an inlet manifold, an outlet manifold, and oxidation components. The oxidation components include a primary oxidation component and a secondary oxidation component, with a circulation control pipe connecting the primary and secondary oxidation components. Each oxidation component includes a heat exchanger, a reaction tank, and a bubble generator. The inlet manifold, heat exchanger, bubble generator, reaction tank, and outlet manifold are connected sequentially via pipes. The heat exchanger includes an insulation tank and a heat exchange tube. The heat exchange tube passes through the insulation tank at both ends and has an inlet port and an outlet port, respectively. The inlet port includes a first inlet port and a second inlet port. The second inlet port communicates with the inlet manifold, and the outlet port communicates with the liquid inlet of the bubble generator. The reaction tank has an inlet port and an outlet port. The outlet port of the reaction tank is divided into a re-reaction outlet and a direct outlet. The direct outlet port is connected to the outlet manifold. The re-reaction outlet port of the reaction tank in the primary oxidation component is connected to the first inlet port of the heat exchanger in the secondary oxidation component via the circulation control pipe.
[0006] Preferably, the main inlet pipe is equipped with a water inlet pump, and the main inlet pipe and the main outlet pipe are connected to the oxidation assembly through branch pipes, each of which is equipped with a flow control valve.
[0007] Preferably, the reaction vessel has a steam port at the top, which is connected to an exhaust pipe. The exhaust pipe is equipped with a temperature control valve and a pressure limiting bypass pipe. The exhaust pipe is connected to the top of the insulation tank, and the insulation tank has a condensate drain port at the bottom.
[0008] Preferably, the heat exchange tube is spirally arranged inside the insulation tank, and the surface of the insulation tank and the exhaust pipe is covered with an insulation sleeve.
[0009] Preferably, the air inlet of the bubble generator is connected to an oxygen supply device, and the gas-liquid mixture outlet of the bubble generator is connected to the liquid inlet of the reaction tank through a pipeline.
[0010] Preferably, the circulation control tube is equipped with a circulation control solenoid valve.
[0011] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model is equipped with multi-stage oxidation components. During normal operation, wastewater is sent into each oxidation component through the main inlet pipe and branch pipes for individual oxidation reaction. When the COD content of the wastewater is high and the single oxidation is incomplete, the oxidation components can be connected in series through the circulation control pipe to send the treated wastewater into the secondary oxidation component for secondary oxidation reaction, ensuring the organic matter removal rate. Attached Figure Description
[0012] Figure 1 This is a first-view three-dimensional structural diagram of a multi-stage oxidation device for organic wastewater proposed in this utility model. Figure 2 for Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 This is a second-view three-dimensional structural diagram of a multi-stage oxidation device for organic wastewater proposed in this utility model. Figure 4 This is a schematic diagram of the heat exchange device structure of a multi-stage oxidation equipment for organic wastewater proposed in this utility model; Figure 5 This is a schematic diagram illustrating the working principle of a multi-stage oxidation device for organic wastewater proposed in this utility model.
[0013] In the diagram: 1. Main inlet pipe; 2. Heat exchanger; 20. Insulation tank; 201. Heat exchange tube; 21. Exhaust pipe; 22. Inlet port; 221. First inlet port; 222. Second inlet port; 23. Outlet port; 24. Condensate drain; 3. Reaction tank; 35. Re-reaction outlet; 36. Direct outlet; 4. Bubble generator; 5. Circulation control pipe; 6. Main drain pipe. Detailed Implementation
[0014] 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. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0015] Reference Figure 1-5 A multi-stage oxidation device for organic wastewater includes an inlet main pipe 1, an outlet main pipe 6, and an oxidation assembly. The inlet main pipe 1 is equipped with an inlet pump for pumping in the organic wastewater to be treated. The inlet main pipe 1 and the outlet main pipe 6 are connected to the oxidation assembly through branch pipes to send the organic wastewater into the oxidation assembly for oxidation reaction to remove organic matter from the wastewater. Each branch pipe is equipped with a flow control valve to control the inlet and outlet flow rates and to ensure the organic matter removal rate. The oxidation assembly includes a primary oxidation assembly and a secondary oxidation assembly. A circulation control pipe 5 is set between the primary oxidation assembly and the secondary oxidation assembly to form a multi-stage oxidation treatment. The oxidation assembly includes a heat exchanger 2, a reaction tank 3, and a bubble generator 4. The inlet main pipe 1, the heat exchanger 2, the bubble generator 4, the reaction tank 3, and the outlet main pipe 6 are connected in sequence through pipelines to realize automatic and continuous wastewater treatment and improve work efficiency. The heat exchange device 2 includes an insulation tank 20 and a heat exchange tube 201. The heat exchange tube 201 passes through the insulation tank 20 at both ends and is provided with an inlet port 22 and an outlet port 23 respectively. The inlet port 22 includes a first inlet port 221 and a second inlet port 222. The first inlet port 221 of the heat exchange device 2 in the primary oxidation component is blocked, the second inlet port 222 is connected to the liquid inlet main pipe 1, and the outlet port 23 is connected to the liquid inlet of the bubble generator 4. The reaction tank 3 is equipped with a liquid inlet and a liquid outlet. The air inlet of the bubble generator 4 is connected to the oxygen supply device. The gas-liquid mixture outlet of the bubble generator 4 is connected to the liquid inlet of the reaction tank 3 through a pipe. The bubble generator 4 adopts a micro-nano bubble generator to fully mix the oxidant into the wastewater. The oxidant is air, oxygen-enriched, pure oxygen, ozone or hydrogen peroxide. The wastewater mixed with oxygen undergoes micro-evaporation liquid phase oxidation in reaction tank 3 to remove organic matter from the wastewater. The discharge port of reaction tank 3 is divided into a re-reaction discharge port 35 and a direct discharge port 36. The height of the re-reaction discharge port 35 is higher than that of the direct discharge port 36. The direct discharge port 36 is connected to the main discharge pipe 6 through a branch pipe. If the wastewater treatment is qualified, it is discharged through the main discharge pipe 6. A solenoid valve is installed on the branch pipe for remote control of the on / off state. The re-reaction discharge port 35 of reaction tank 3 in the secondary oxidation component is sealed. The top of the reaction vessel 3 is equipped with a steam port for discharging steam and carbon dioxide to reduce the internal pressure of the reaction vessel 3. The steam port of the reaction vessel 3 is connected to an exhaust pipe 21. The exhaust pipe 21 is equipped with a temperature control valve and a pressure limiting bypass pipe. The pressure limiting bypass pipe is used to draw out steam for heat recovery. The temperature control valve controls the opening and closing of the exhaust pipe 21 by detecting the temperature inside the reaction vessel 3, thereby regulating the pressure inside the reaction vessel 3. When the reaction starts, the temperature is low, so the steam discharge is reduced to ensure that the temperature of the reaction vessel 3 rises in time. After the temperature of the reaction vessel 3 rises, the steam discharge is increased to avoid the temperature and pressure inside the reaction vessel 3 becoming too high. The exhaust pipe 21 is connected to the top of the insulation tank 20, and steam is introduced into the insulation tank 20 to preheat the wastewater in the heat exchange tube 201. The bottom of the insulation tank 20 is provided with a condensate drain outlet 24 to discharge steam condensate and carbon dioxide. The heat exchange tube 201 is spirally arranged in the insulation tank 20 to increase the heat transfer area. The surface of the insulation tank 20 and the exhaust pipe 21 is covered with an insulation sleeve to reduce heat loss. The reaction vessel 3 in the primary oxidation assembly has a re-reaction outlet 35 connected to the first inlet port 221 of the heat exchange device 2 in the secondary oxidation assembly via a circulation control pipe 5. The circulation control pipe 5 is equipped with a circulation control solenoid valve to achieve multi-stage oxidation treatment.
[0016] Example 1: When the COD of the wastewater is low and the amount of wastewater to be treated is small, a single reaction tank 3 is used for oxidation reaction, and the circulation control solenoid valve on the circulation control pipe 5 is closed. The inlet pump pumps wastewater into the inlet manifold 1, which then sends it to the bubble generator 4 via the heat exchanger 201. The oxygen supply device provides oxidant, and the bubble generator 4 mixes oxygen with the wastewater thoroughly before sending it into the reaction tank 3 for oxidation. The generated steam is sent to the insulation tank 20 through the exhaust pipe 21 to preheat the wastewater in the heat exchanger 201, thereby achieving heat recovery and reducing energy consumption. The treated water is then discharged through the drain manifold 6. Example 2: When the wastewater has a low COD but a large amount of wastewater needs to be treated, the circulation control solenoid valve on the circulation control pipe 5 is closed, and the wastewater is sent to multiple oxidation components through the main inlet pipe 1 and branch pipes. The multiple oxidation components are connected in parallel and carry out oxidation reactions at the same time, and then discharged through the main outlet pipe 6. Example 3: When the COD of the wastewater is high, the circulation control solenoid valve on the circulation control pipe 5 is opened, and multiple oxidation components are connected in series, so that the wastewater is preferentially sent to the primary oxidation component. The wastewater undergoes an oxidation reaction once in the primary oxidation component reactor 3, but the organic matter in the wastewater is not completely removed. The solenoid valve on the branch pipe of the direct discharge port 36 is closed, and the wastewater is sent through the re-reaction discharge port 35 and the circulation control pipe 5 to the first inlet port 221 of the heat exchange device 2 in the secondary oxidation component. The flow is limited or cut off at the second inlet port 222 of the heat exchange device 2 in the secondary oxidation component. The wastewater treated by the primary oxidation component is mixed and diluted with the wastewater to be treated in the secondary oxidation component, preheated again, mixed with oxidant, and sent to the reactor 3 in the secondary oxidation component for oxidation reaction to ensure that the organic matter in the wastewater is removed and meets the discharge standards. If organic matter still cannot be removed, a tertiary oxidation unit can be connected, or the oxidant can be replaced.
[0017] To reduce production costs, different oxidants can be introduced into the primary and secondary oxidation components. For example, if the wastewater has a high COD, ozone or hydrogen peroxide with good oxidizing properties can be introduced to improve the reaction efficiency. If the wastewater has a low COD, oxygen-enriched or air can be introduced.
[0018] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
Claims
1. A multi-stage oxidation device for organic wastewater, comprising an inlet manifold (1), an outlet manifold (6), and oxidation components, characterized in that, The oxidation assembly includes a primary oxidation assembly and a secondary oxidation assembly. A circulation control pipe (5) is provided between the primary oxidation assembly and the secondary oxidation assembly. The oxidation assembly includes a heat exchange device (2), a reaction tank (3), and a bubble generator (4). The liquid inlet main pipe (1), the heat exchange device (2), the bubble generator (4), the reaction tank (3), and the liquid outlet main pipe (6) are connected in sequence through pipes. The heat exchange device (2) includes a heat preservation tank (20) and a heat exchange tube (201). The heat exchange tube (201) passes through the heat preservation tank (20) at both ends and is provided with an inlet port (22) and an outlet port (23). The inlet port (22) includes a first inlet port (221) and a second inlet port (222). The second inlet port (222) is connected to the liquid inlet main pipe (1). The outlet port (23) is connected to the liquid inlet of the bubble generator (4). The reaction tank (3) is provided with an inlet and an outlet. The outlet of the reaction tank (3) is divided into a re-reaction outlet (35) and a direct outlet (36). The direct outlet (36) is connected to the main drain pipe (6). The re-reaction outlet (35) of the reaction tank (3) in the primary oxidation assembly is connected to the first inlet port (221) of the heat exchange device (2) in the secondary oxidation assembly through the circulation control pipe (5).
2. The multi-stage oxidation equipment for organic wastewater according to claim 1, characterized in that, The main inlet pipe (1) is equipped with a water pump. The main inlet pipe (1) and the main outlet pipe (6) are connected to the oxidation assembly through branch pipes. Each branch pipe is equipped with a flow control valve.
3. The multi-stage oxidation equipment for organic wastewater according to claim 1, characterized in that, The top of the reaction vessel (3) is provided with a steam port, and the steam port of the reaction vessel (3) is connected to an exhaust pipe (21). The exhaust pipe (21) is provided with a temperature control valve and a pressure limiting bypass pipe. The exhaust pipe (21) is connected to the top of the heat preservation tank (20), and the bottom of the heat preservation tank (20) is provided with a condensate drain outlet (24).
4. The multi-stage oxidation equipment for organic wastewater according to claim 3, characterized in that, The heat exchange tube (201) is spirally arranged inside the heat preservation tank (20), and the surface of the heat preservation tank (20) and the exhaust pipe (21) is covered with a heat preservation sleeve.
5. The multi-stage oxidation equipment for organic wastewater according to claim 1, characterized in that, The air inlet of the bubble generator (4) is connected to the oxygen supply device, and the gas-liquid mixture outlet of the bubble generator (4) is connected to the liquid inlet of the reaction tank (3) through a pipeline.
6. The multi-stage oxidation equipment for organic wastewater according to claim 1, characterized in that, The circulation control tube (5) is equipped with a circulation control solenoid valve.