Catalytic ozonation device for advanced treatment of wastewater and wastewater treatment system

Abstract

The utility model relates to the technical field of advanced wastewater treatment, and discloses a catalytic ozonation device for advanced wastewater treatment and a wastewater treatment system, the catalytic ozonation device comprises: a micro-nano bubble generating assembly for forming at least part of wastewater into micro-nano bubble water; the oxidation tower comprises a tower body with a water inlet and a water outlet and a backflow pipeline with a backflow inlet and a backflow outlet, the backflow inlet is arranged close to the water outlet and communicated with the tower body, and the backflow outlet is arranged close to the water inlet and communicated with the tower body; the water inlet pipe is respectively communicated with the micro-nano bubble generating assembly and the water inlet. According to the technical scheme, the micro-nano bubble generating assembly is utilized to enable at least part of the wastewater to form the micro-nano bubble water, so that refractory organic matters in the wastewater are more effectively removed; the wastewater can be homogenized by utilizing the return pipeline, so that the wastewater treatment load is reduced, and meanwhile, the wastewater treatment efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of advanced wastewater treatment technology, specifically to an ozone catalytic oxidation device for advanced wastewater treatment. Furthermore, it also relates to a wastewater treatment system. Background Technology

[0002] With the acceleration of industrialization, wastewater discharge has become an increasingly serious problem, putting enormous pressure on the environment. Although traditional wastewater treatment methods can remove pollutants from wastewater to some extent, they often suffer from problems such as low treatment efficiency, high energy consumption, and easy generation of secondary pollution. In particular, the removal of organic matter from high-salt wastewater has always been a challenge for the industry. Due to the high salt content, the organic matter has poor biodegradability, which inhibits the survival of microorganisms, and conventional biological treatment cannot meet the requirements.

[0003] Currently, existing technologies typically employ ozone catalytic oxidation to treat high-salinity wastewater. Ozone, in the presence of a catalyst, decomposes to produce hydroxyl radicals (·OH), which can degrade recalcitrant pollutants in the wastewater, thereby improving its biodegradability without generating secondary pollution. However, existing ozone catalytic oxidation technologies suffer from drawbacks such as high treatment load and low treatment efficiency in the oxidation tower. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of high wastewater treatment load and low treatment efficiency in the existing technology, and to provide an ozone catalytic oxidation device and wastewater treatment system for deep wastewater treatment. The ozone catalytic oxidation device has the advantages of low energy consumption and high treatment efficiency.

[0005] To achieve the above objectives, a first aspect of this utility model provides an ozone catalytic oxidation device for deep wastewater treatment, comprising: a micro-nano bubble generating component for forming at least a portion of wastewater into micro-nano bubble water; an oxidation tower, the oxidation tower including a tower body having an inlet and an outlet, and a reflux pipeline having a reflux inlet and a reflux outlet, the reflux inlet being disposed near the outlet and communicating with the tower body, and the reflux outlet being disposed near the inlet and communicating with the tower body; and an inlet pipe, the inlet pipe being respectively connected to the micro-nano bubble generating component and the inlet.

[0006] This invention provides an ozone catalytic oxidation device for advanced wastewater treatment. Through a micro-nano bubble generating component, at least a portion of the wastewater is transformed into micro-nano bubble water. Compared to the large bubbles formed by traditional aeration, micro-nano bubble water has a larger specific surface area, longer residence time, and higher mass transfer efficiency, thus more effectively removing recalcitrant organic matter from the wastewater. Furthermore, the reflux pipeline is connected to the oxidation tower body via a reflux inlet and a reflux outlet. The reflux inlet is located near the outlet, and the reflux outlet is located near the inlet. Since the wastewater enters the tower body for treatment through the inlet and then exits through the outlet, the wastewater concentration near the inlet is higher than the effluent concentration near the outlet. The reflux pipeline allows the lower-concentration effluent to be returned to the inlet and mixed with the higher-concentration wastewater, achieving homogenization of the wastewater, thereby reducing the wastewater treatment load and improving wastewater treatment efficiency.

[0007] In some embodiments, the micro-nano bubble generating assembly includes a water inlet tank, a gas generating device, and a micro-nano bubble generating device that is connected to the water inlet tank and the gas generating device respectively. The micro-nano bubble generating device is used to mix at least a portion of the wastewater transported by the water inlet tank with the gas transported by the gas generating device to form the micro-nano bubble water. The water inlet pipe is connected to the micro-nano bubble generating device and the water inlet respectively.

[0008] In some embodiments, the oxidation tower further includes a partition disposed within the tower body and located between the inlet and the outlet, the partition being used to hold the catalyst.

[0009] In some embodiments, the partition is formed with a plurality of through holes, the plurality of through holes being configured to allow the wastewater to pass through while preventing the catalyst from passing through.

[0010] In some embodiments, the reflux inlet is connected to a position on the tower body between the baffle and the outlet, and the reflux outlet is connected to a position on the tower body between the baffle and the inlet.

[0011] In some embodiments, the inlet is located at the lower part of the tower body, and the outlet is located at the upper part of the tower body. The ozone catalytic oxidation device further includes an outlet pool communicating with the outlet, and the height of the outlet pool is lower than the height of the outlet.

[0012] In some embodiments, the ozone catalytic oxidation device for deep wastewater treatment provided by the present invention further includes a dilution pipeline for conveying the effluent from the effluent tank to the micro-nano bubble generating component.

[0013] In some embodiments, the inlet includes a water distribution device for uniformly distributing the wastewater within the tower body.

[0014] In some embodiments, the ozone catalytic oxidation device for deep wastewater treatment provided by the present invention further includes a tail gas destruction device connected to the gas outlet of the tower body, the tail gas destruction device being used to treat the gas flowing out from the gas outlet.

[0015] A second aspect of this invention provides a wastewater treatment system, including the aforementioned ozone catalytic oxidation device for deep wastewater treatment.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the ozone catalytic oxidation device for deep wastewater treatment disclosed in an embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures

[0019] 1-Inlet pool, 2-Inlet pump, 3-Micro-nano bubble generator, 4-Oxidation tower, 5-Water distribution equipment, 6-Catalyst, 7-Baffle, 8-Recirculation pump, 9-Outlet pool, 10-Gas generator, 11-Flow meter, 12-Gas outlet, 13-Tail gas destruction equipment, 14-Recirculation pipeline, 141-Recirculation inlet, 142-Recirculation outlet. Detailed Implementation

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] In this utility model, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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.

[0022] Furthermore, the terms "first," "second," etc., 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, the descriptions using terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0024] In this utility model, unless otherwise explicitly 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, an electrical connection, or a connection that allows communication between them; 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] This invention addresses the problems of high wastewater treatment load and low treatment efficiency in existing technologies by providing an ozone catalytic oxidation device and wastewater treatment system for deep wastewater treatment.

[0026] The first aspect of this utility model provides an ozone catalytic oxidation device for advanced wastewater treatment, as described above. Figure 1 As shown, the ozone catalytic oxidation device includes: a micro / nano bubble generating component, an oxidation tower 4, and an inlet pipe connected to both the micro / nano bubble generating component and the oxidation tower 4. The micro / nano bubble generating component is used to generate at least a portion of the wastewater into micro / nano bubble water, which is then transported to the oxidation tower 4 through the inlet pipe. Figure 1 As shown, the oxidation tower 4 includes a tower body with an inlet and an outlet, and a reflux pipe 14 with a reflux inlet 141 and a reflux outlet 142. The reflux inlet 141 is located near the outlet and connected to the tower body, and the reflux outlet 142 is located near the inlet and connected to the tower body. One end of the inlet pipe is connected to the micro-nano bubble generating component, and the other end is connected to the inlet. The tower body has a containment space. The micro-nano bubble water generated in the micro-nano bubble generating component is transported through the inlet pipe and the inlet to the containment space inside the tower body for reaction, thereby degrading the organic matter in the wastewater.

[0027] The ozone catalytic oxidation device for advanced wastewater treatment provided by this invention uses a micro-nano bubble generating component to form at least a portion of the wastewater into micro-nano bubble water. Compared with the large bubbles formed by traditional aeration, micro-nano bubble water has a larger specific surface area, longer residence time, and higher mass transfer efficiency, thus more effectively removing recalcitrant organic matter from wastewater. Furthermore, the reflux pipeline 14 is connected to the oxidation tower 4 via a reflux inlet 141 and a reflux outlet 142. The reflux inlet 141 is located near the outlet, and the reflux outlet 142 is located near the inlet. Since the wastewater enters the tower through the inlet for treatment and then exits through the outlet, the wastewater concentration near the inlet is higher than the effluent concentration near the outlet. The reflux pipeline 14 allows the lower-concentration effluent to be refluxed back to the inlet and mixed with the higher-concentration wastewater, achieving homogenization of the wastewater, thereby reducing the wastewater treatment load and improving wastewater treatment efficiency.

[0028] In some embodiments, the micro-nano bubble generating component may include a micro-nano bubble generating device 3, which has a first inlet for wastewater inflow, a second inlet for gas inflow, a micro-nano bubble generating module, and an outlet for discharging micro-nano bubble water. The micro-nano bubble generating module is used to mix at least a portion of the wastewater and gas to form micro-nano bubble water. The micro-nano bubble generating module includes a pressurized dissolved gas unit, a jetting unit, and an ultrasonic dispersion unit.

[0029] According to one embodiment of the ozone catalytic oxidation device of this utility model, refer to Figure 1 As shown, the micro-nano bubble generating assembly also includes a water inlet tank 1 and a gas generating device 10. The micro-nano bubble generating device 3 is connected to both the water inlet tank 1 and the gas generating device 10. The water inlet tank 1 transports wastewater to the micro-nano bubble generating device 3 via a water pump 2. The gas generating device 10 provides gas to the micro-nano bubble generating device 3. It should be noted that the gas can be one or more of oxygen and ozone. Figure 1 The gas generating device 10 supplies gas to the micro-nano bubble generating device 3 through a gas supply pipeline. A flow meter 11 is installed on the gas supply pipeline to control the precise amount of gas added. The two ends of the water inlet pipe are connected to the liquid outlet of the micro-nano bubble generating device 3 and the water inlet of the tower body, respectively. The micro-nano bubble water formed in the micro-nano bubble generating device 3 enters the tower body through the water inlet pipe.

[0030] It should also be noted that the micro-nano bubble water in this invention refers to a fluid with bubbles formed by mixing wastewater and gas, and the diameter of the bubbles does not exceed 100 micrometers.

[0031] In some embodiments, the oxidation tower 4 further includes a baffle 7 disposed in the tower body and located between the inlet and the outlet. The baffle 7 is used to place the catalyst 6. The catalyst 6 can be packed in a fixed bed or a fluidized bed, so as to prevent the catalyst 6 from clogging the inlet as it flows with the fluid in the tower body.

[0032] In the ozone catalytic oxidation device provided by this utility model, the partition 7 may not have through holes. The catalyst 6 is placed on the partition 7, and a gap is formed between the end of the partition 7 and the inner wall of the tower. Wastewater flows through the gap and reacts with the catalyst 6. Alternatively, in some embodiments, the partition 7 has multiple through holes configured to allow wastewater to pass through while preventing the catalyst 6 from passing through. Specifically, the size of the through holes is set to be smaller than the size of the catalyst 6 to ensure that the catalyst 6 cannot pass through the through holes and to prevent the catalyst 6 from clogging the inlet.

[0033] In some embodiments, the reflux inlet 141 is connected to a position on the tower body between the baffle 7 and the outlet, and the reflux outlet 142 is connected to a position on the tower body between the baffle 7 and the inlet. Thus, the effluent concentration formed between the baffle 7 and the outlet is low. This effluent enters the reflux pipe 14 through the reflux inlet 141 and is discharged from the reflux outlet 142, mixing with the higher-concentration wastewater between the inlet and the baffle 7, further improving the homogenization of the wastewater. Further, referring to… Figure 1 As shown, a return circulation pump 8 is also installed in the return pipeline 14 to facilitate the return of the outlet water to the space between the inlet and the baffle 7.

[0034] In some embodiments, combined with Figure 1 As shown, the inlet is located at the lower part of the tower body, and the outlet is located at the upper part of the tower body. The ozone catalytic oxidation device also includes an outlet pool 9 connected to the outlet, and the height of the outlet pool 9 is lower than the height of the outlet. In this way, the water flowing out of the outlet can flow into the outlet pool 9 by gravity without the need for additional power, thereby further reducing the energy consumption of the ozone catalytic oxidation device of this invention.

[0035] In some embodiments, the ozone catalytic oxidation device provided by this utility model further includes a dilution pipeline for conveying the effluent from the effluent tank 9 to the micro-nano bubble generating component. For example, the two ends of the dilution pipeline can be connected to the inlet tank 1 and the effluent tank 9 respectively. When the ozone catalytic oxidation device of this utility model is just starting to operate or when the effluent indicators are not up to standard, the effluent from the effluent tank 9 is conveyed to the inlet tank 1 for circulation treatment, thereby diluting the concentration of wastewater in the inlet tank 1 and further reducing the treatment load of the ozone catalytic oxidation device.

[0036] In some embodiments, the inlet includes a water distribution device 5 for uniformly distributing wastewater in the tower body. The water distribution device 5 may include a water distribution pipe connected to the inlet pipe and a water distribution head disposed on the water distribution pipe. There may be multiple water distribution pipes and water distribution heads. Multiple water distribution heads are uniformly disposed in the lower part of the tower body, so that the wastewater is uniformly distributed in the tower body after passing through the water distribution heads.

[0037] In some embodiments, the ozone catalytic oxidation device provided by this invention further includes a tail gas destruction device 13 connected to the gas outlet 12 of the tower body. The tail gas destruction device 13 is used to treat the gas flowing out from the gas outlet 12. For example, if the tail gas in the tower body is ozone, the ozone is discharged into the tail gas destruction device 13 through the gas outlet, where it is converted into oxygen and can be discharged into the atmosphere without pollution. Of course, the tail gas destruction device 13 can be a heated tail gas destruction device, a catalytic decomposition tail gas destruction device, an adsorption tail gas destruction device, or a combination of the above.

[0038] A second aspect of this invention provides a wastewater treatment system, including the aforementioned ozone catalytic oxidation device for advanced wastewater treatment. In addition, it further includes a pretreatment device and a biochemical treatment device, with the wastewater being treated sequentially through the pretreatment device, the biochemical treatment device, and the ozone catalytic oxidation device.

[0039] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An ozone catalytic oxidation device for advanced wastewater treatment, characterized in that, include: A micro / nano bubble generating component, wherein the micro / nano bubble generating component is used to form at least a portion of wastewater into micro / nano bubble water; An oxidation tower (4) comprising a tower body having an inlet and an outlet, and a reflux pipeline (14) having a reflux inlet (141) and a reflux outlet (142), wherein the reflux inlet (141) is disposed near the outlet and communicates with the tower body, and the reflux outlet (142) is disposed near the inlet and communicates with the tower body; and, The water inlet pipe is connected to the micro / nano bubble generating component and the water inlet.

2. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 1, characterized in that, The micro-nano bubble generating component includes an inlet pool (1), a gas generating device (10), and a micro-nano bubble generating device (3) connected to the inlet pool (1) and the gas generating device (10) respectively. The micro-nano bubble generating device (3) is used to mix at least a portion of the wastewater transported by the inlet pool (1) with the gas transported by the gas generating device (10) to form the micro-nano bubble water. The inlet pipe is connected to the micro-nano bubble generating device (3) and the inlet respectively.

3. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 1, characterized in that, The oxidation tower (4) also includes a partition (7) disposed in the tower body and located between the inlet and the outlet, the partition (7) being used to place the catalyst (6).

4. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 3, characterized in that, The partition (7) has a plurality of through holes configured to allow the wastewater to pass through while preventing the catalyst (6) from passing through.

5. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 3, characterized in that, The reflux inlet (141) is connected to the tower body at a position between the partition (7) and the outlet, and the reflux outlet (142) is connected to the tower body at a position between the partition (7) and the inlet.

6. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 1, characterized in that, The inlet is located at the lower part of the tower body, and the outlet is located at the upper part of the tower body. The ozone catalytic oxidation device also includes an outlet pool (9) connected to the outlet. The height of the outlet pool (9) is lower than the height of the outlet.

7. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 6, characterized in that, It also includes a dilution pipeline for conveying the effluent from the effluent pool (9) to the micro-nano bubble generating assembly.

8. The ozone catalytic oxidation device for advanced wastewater treatment according to claim 1, characterized in that, The inlet includes a water distribution device (5) for evenly distributing the wastewater within the tower body.

9. The ozone catalytic oxidation device for advanced wastewater treatment according to any one of claims 1-8, characterized in that, It also includes a tail gas destruction device (13) connected to the gas outlet (12) of the tower body, the tail gas destruction device (13) being used to process the gas flowing out from the gas outlet (12).

10. A wastewater treatment system, characterized in that, Includes the ozone catalytic oxidation device for advanced wastewater treatment according to any one of claims 1-9.

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