A multi-stage vertical flow sewage ozone catalytic oxidation reactor

Abstract

This utility model relates to a multi-stage vertical flow wastewater ozone catalytic oxidation reactor. The reactor body is equipped with filter plates to divide its internal cavity from bottom to top into an auxiliary functional zone, an ozone catalytic decomposition zone, a three-phase mixing reaction zone, and a gas-liquid two-phase enhanced reaction zone. The ozone catalytic decomposition zone is filled with an ozone decomposition catalyst, and the three-phase mixing reaction zone is filled with a reaction enhancement catalyst. An inlet connected to the auxiliary functional zone is provided on the reactor body. An ozone diffusion system is used to extract wastewater from the gas-liquid two-phase enhanced reaction zone, mix it with ozone, and then send it into the auxiliary functional zone. A dosing system is used to add a pH adjuster to the gas-liquid two-phase enhanced reaction zone. The beneficial effects are: by designing the reactor in stages and selectively filling each stage with catalysts, the function of ozone decomposing pollutants is enhanced across different stages, thereby strengthening the corresponding reaction process in a single stage, promoting the reaction rate, and shortening the reaction range.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a multi-stage vertical flow wastewater ozone catalytic oxidation reactor. Background Technology

[0002] Ozone (O3) is a strong oxidant (oxidation potential 2.07V), which can directly oxidize organic matter or indirectly oxidize it by generating hydroxyl radicals (·OH, oxidation potential 2.8V). It can effectively decompose recalcitrant organic matter (such as dyes, drug residues, pesticides, etc.). Ozone catalytic oxidation refers to the introduction of catalysts (such as metal oxides, activated carbon, transition metals, etc.) to significantly improve ozone decomposition efficiency and promote ·OH generation, thereby breaking through the bottleneck of traditional ozone treatment. The role of catalysts includes: providing active sites to accelerate ozone decomposition, adsorbing pollutants to enrich the reaction interface, and prolonging the residence time of ozone in the reaction system.

[0003] Ozone catalytic oxidation can currently be used for industrial wastewater treatment in industries such as pharmaceuticals, chemicals, and printing and dyeing, treating wastewater containing benzene compounds, antibiotics, and polycyclic aromatic hydrocarbons. For dye wastewater, ozone catalytic oxidation can destroy chromophores (such as azo bonds) and reduce biotoxicity. For municipal sewage treatment, it can be used for upgrading and retrofitting sewage treatment plant effluent. It can also partially break down or mineralize emerging pollutants such as PFAS (perfluorinated compounds) and microplastics.

[0004] Current ozone catalytic reactors have the following shortcomings:

[0005] 1. Solid catalysts in the reactor can easily escape from the reaction system during backwashing and enter downstream processes;

[0006] 2. Some catalysts have short lifespans, making maintenance and shutdown difficult when packing material replacement is required;

[0007] 3. Ozone mass transfer efficiency is low in gas-liquid-solid three-phase reactions;

[0008] 4. Bromate (BrO3) may be formed. - (Carcinogens) or small molecule carboxylic acids. Utility Model Content

[0009] The technical problem to be solved by this utility model is to provide a multi-stage vertical flow wastewater ozone catalytic oxidation reactor to overcome the shortcomings of the prior art.

[0010] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0011] A multi-stage vertical flow wastewater ozone catalytic oxidation reactor includes: a reactor body, an ozone diffusion system, and a dosing system. The reactor body is equipped with filter plates to divide its interior cavity from bottom to top into an auxiliary functional zone, an ozone catalytic decomposition zone, a three-phase mixing reaction zone, and a gas-liquid two-phase enhanced reaction zone. The ozone catalytic decomposition zone is filled with an ozone decomposition catalyst, and the three-phase mixing reaction zone is filled with a reaction enhancement catalyst. An inlet connected to the auxiliary functional zone is provided on the reactor body. The ozone diffusion system is used to extract wastewater from the gas-liquid two-phase enhanced reaction zone, mix it with ozone, and then send it into the auxiliary functional zone. The dosing system is used to add a pH adjuster to the gas-liquid two-phase enhanced reaction zone. An outlet connected to the gas-liquid two-phase enhanced reaction zone is provided on the reactor body.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the water inlet is connected to the water pump via an inlet valve assembly.

[0014] Furthermore, the water outlet is connected to the water outlet valve assembly via a pipe.

[0015] Furthermore, the ozone diffusion system includes: a water jet injector, the inlet of which is connected to a circulation pipe via a circulation pump, the circulation pipe being connected to the gas-liquid two-phase enhanced reaction zone of the reactor body, the outlet of which is connected to the auxiliary functional area of ​​the reactor body via a pipe, and the suction end of which is connected to an ozone distributor.

[0016] Furthermore, an online monitoring instrument for monitoring pH value is installed in the gas-liquid two-phase enhanced reaction zone, and the online monitoring instrument and the dosing system are electrically connected to the PLC system.

[0017] Furthermore, an air distributor is installed in the auxiliary functional area, and the inlet of the air distributor is connected to the compressed air supply end.

[0018] Furthermore, an exhaust port is opened at the top of the reactor body, which is connected to the gas-liquid two-phase enhanced reaction zone, and an ozone exhaust gas destroyer is connected to the exhaust port.

[0019] Furthermore, the volume ratio of ozone decomposition catalyst filled in the ozone catalytic decomposition zone is greater than 90%, and the particle size of the ozone decomposition catalyst is 10 mm to 30 mm.

[0020] Furthermore, the volume ratio of the reaction-enhancing catalyst filled in the three-phase mixed reaction zone is 30% to 35%, and the particle size of the reaction-enhancing catalyst is 4 mm to 6 mm.

[0021] Furthermore, each filter hole on the filter plate is equipped with a filter head.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. By designing the reactor in stages and selectively filling each stage with catalysts, the function of ozone in decomposing pollutants is enhanced across different stages. This strengthens the corresponding reaction process in a single stage, promotes the reaction rate, shortens the reaction range, strengthens the catalysis of specific processes, and inhibits, regulates, and controls byproducts. At the same time, the isolation between each stage enables independent operation and maintenance of the corresponding area, providing convenient conditions for later operation and maintenance. This forms a multi-stage ozone catalytic reaction system with good treatment effect and operational advantages, which has significant advantages in removing recalcitrant organic matter in water treatment.

[0024] 2. By arranging filter plates and filter heads between each stage, three different reaction conditions—fixed bed, fluidized bed, and gas-liquid two-phase reaction—are achieved in a single reactor. Furthermore, the arrangement of filter plates and filter heads between each stage ensures that the catalyst does not flow between stages, thus achieving catalyst separation.

[0025] 3. The ozone diffusion system achieves ozone diffusion while simultaneously realizing internal circulation within the reactor. It also mixes the reagents added in the gas-liquid two-phase enhanced reaction zone into the reaction system in the auxiliary functional zone, ensuring the complete decomposition of pollutants and inhibiting the formation of byproducts, thus providing favorable operating conditions for subsequent reactions.

[0026] 4. By using online monitoring instruments and a dosing system, specific pH adjusters are added during the two-phase reaction stage to stabilize and control the pH value of the reaction section, enhance specific reaction processes, and inhibit the formation of harmful byproducts.

[0027] 5. The filter plates and filter heads in the three-phase mixed reaction zone and the gas-liquid two-phase enhanced reaction zone ensure that the effluent does not contain catalyst. At the same time, during the gas washing process, the catalyst will not escape into the backwash drainage due to high-intensity gas washing, thus ensuring the total amount of catalyst in the reactor. Attached Figure Description

[0028] Figure 1 This is a structural diagram of the multi-stage vertical flow wastewater ozone catalytic oxidation reactor of this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Reactor body; 110. Auxiliary functional area; 120. Ozone catalytic decomposition zone; 130. Three-phase mixed reaction zone; 140. Gas-liquid two-phase enhanced reaction zone; 150. Inlet; 160. Outlet; 170. Exhaust port; 2. Ozone diffusion system; 210. Water ejector; 220. Circulation pump; 230. Circulation pipe; 240. Ozone distributor; 3. Dosing system; 4. Filter plate; 5. Ozone decomposition catalyst; 6. Reaction enhancement catalyst; 7. Inlet pump; 8. Inlet valve assembly; 9. Gas distributor; 10. Compressed air supply end; 11. Ozone tail gas destroyer; 12. Filter head; 13. Outlet valve assembly. Detailed Implementation

[0031] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0032] Example 1

[0033] like Figure 1 As shown, a multi-stage vertical flow wastewater ozone catalytic oxidation reactor includes: a reactor body 1, an ozone diffusion system 2, and a dosing system 3. The inner cavity of the reactor body 1 is divided into an auxiliary functional zone 110, an ozone catalytic decomposition zone 120, a three-phase mixing reaction zone 130, and a gas-liquid two-phase enhanced reaction zone 140 from bottom to top. That is, the inner cavity of the reactor body 1 is divided into four sections, and the adjacent zones are separated by filter plates 4. The edges of the filter plates 4 are fixedly connected to the inner wall of the reactor body 1.

[0034] The ozone catalytic decomposition zone 120 is filled with ozone decomposition catalyst 5. The size of the ozone decomposition catalyst 5 is larger than the filter pore size on the filter plate 4. The three-phase mixed reaction zone 130 is filled with reaction enhancement catalyst 6. The size of the reaction enhancement catalyst 6 is larger than the filter pore size on the filter plate 4. The reaction enhancement catalyst 6 can be a highly efficient heterogeneous ozone catalyst (copper and manganese supported).

[0035] An inlet 150 is provided on the reactor body 1, which is connected to the auxiliary functional area 110. The ozone diffusion system 2 is used to extract the sewage in the gas-liquid two-phase enhanced reaction zone 140 and mix it with ozone before sending it into the auxiliary functional area 110. The dosing system 3 is used to add pH adjuster to the gas-liquid two-phase enhanced reaction zone 140 to control the pH value of the reaction system and inhibit the generation of by-products. An outlet 160 is provided on the reactor body 1, which is connected to the gas-liquid two-phase enhanced reaction zone 140, so that the sewage in the gas-liquid two-phase enhanced reaction zone 140 is discharged through the outlet 160.

[0036] Example 2

[0037] like Figure 1As shown, this embodiment is a further improvement on embodiment 1, as detailed below:

[0038] The inlet 150 is connected to the inlet pump 7 via the inlet valve assembly 8. The opening and closing of the inlet valve assembly 8 determines whether the inlet pump 7 can pump sewage into the inlet 150.

[0039] Furthermore, the outlet 160 is connected to the outlet valve group 13 via a pipeline. The opening and closing of the outlet valve group 13 determines whether the sewage in the gas-liquid two-phase enhanced reaction zone 140 can be discharged through the pipeline. The outlet valve group 13 on the pipeline is configured with one valve in use and one valve on standby.

[0040] Example 3

[0041] like Figure 1 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below:

[0042] The ozone diffusion system 2 includes: a water ejector 210, the inlet of which is connected to the outlet of a circulation pump 220, and the inlet of the circulation pump 220 is connected to the gas-liquid two-phase enhanced reaction zone 140 of the reactor body 1 via a circulation pipe 230. The outlet of the water ejector 210 is connected to the auxiliary functional zone 110 of the reactor body 1 via a pipe. The suction end of the water ejector 210 is connected to an ozone distributor 240. The circulation pump 220 draws wastewater from the gas-liquid two-phase enhanced reaction zone 140 via the circulation pipe 230 and pumps it into the water ejector 210. At the same time, the ozone distributor 240 also sends ozone into the water ejector 210, so that the wastewater and ozone are evenly mixed in the water ejector 210, increasing the reaction cycle ratio. At the same time, the pressure of the circulation pump 220 is used to mix the ozone and wastewater, and the mixed ozone is then sent into the auxiliary functional zone 110.

[0043] Example 4

[0044] like Figure 1 As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below:

[0045] An online monitoring instrument for monitoring pH value is installed in the gas-liquid two-phase enhanced reaction zone 140. The online monitoring instrument is electrically connected to the PLC system, and the dosing system 3 is also electrically connected to the PLC system. The online monitoring instrument will feed back the pH value monitored in the gas-liquid two-phase enhanced reaction zone 140 to the PLC system. The PLC system will control the dosing system 3 to accurately add pH adjuster based on the feedback pH value.

[0046] Example 5

[0047] like Figure 1 As shown, this embodiment is a further improvement on any one of embodiments 1 to 4, as detailed below:

[0048] A gas distributor 9 is installed in the auxiliary functional area 110. The inlet of the gas distributor 9 is connected to the compressed air supply end 10. External compressed air enters the gas distributor 9 through the compressed air supply end 10, and then enters the auxiliary functional area 110 of the reactor body 1 through the gas distributor 9. The deposits between the catalysts are removed by high-intensity gas washing. After the gas washing is completed, the backwash water is discharged to the waste liquid pool through the water outlet 160.

[0049] Example 6

[0050] like Figure 1 As shown, this embodiment is a further improvement on any one of embodiments 1 to 5, as detailed below:

[0051] An exhaust port 170 is opened at the top of the reactor body 1, which is connected to the gas-liquid two-phase enhanced reaction zone 140. An ozone exhaust gas destroyer 11 is connected to the exhaust port 170. Ozone that escapes into the air in the system is sent into the ozone exhaust gas destroyer 11 through the exhaust port 170 and treated before being discharged into the atmosphere after meeting the standards.

[0052] Example 7

[0053] like Figure 1 As shown, this embodiment is a further improvement on any one of embodiments 1 to 6, as detailed below:

[0054] The volume ratio of ozone decomposition catalyst 5 filled in the ozone catalytic decomposition zone 120 is greater than 90%. The ozone decomposition catalyst 5 with a high filling ratio forms a fixed bed in the ozone catalytic decomposition zone 120, thereby performing specific catalytic decomposition of ozone in the system. The particle size of the ozone decomposition catalyst 5 is 10 mm to 30 mm.

[0055] Furthermore, the volume ratio of the reaction-enhancing catalyst 6 filled in the three-phase mixed reaction zone 130 is 30% to 35%. The reaction-enhancing catalyst 6 with a lower filling ratio forms a fluidized bed in the three-phase mixed reaction zone 130, which accelerates the reaction rate of hydroxyl radicals and target pollutants in the system. The particle size of the reaction-enhancing catalyst 6 is 4 mm to 6 mm.

[0056] The reactor body 1 is equipped with a discharge port, a dosing port and an observation port at the corresponding ozone catalytic decomposition zone 120, and the reactor body 1 is equipped with a discharge port, a dosing port and an observation port at the corresponding three-phase mixing reaction zone 130. By opening discharge ports, dosing ports and observation ports at each stage, the catalyst at each stage can be replaced, which facilitates maintenance for different sections.

[0057] Example 8

[0058] like Figure 1As shown, this embodiment is a further improvement on any one of embodiments 1 to 7, as detailed below:

[0059] Each filter hole on the filter plate 4 is equipped with a filter head 12, which can filter water. For example, the wastewater in the ozone catalytic decomposition zone 120 can be filtered through the filter head 12 on the filter plate 4 and then enter the three-phase mixing reaction zone 130. The wastewater in the three-phase mixing reaction zone 130 can be filtered through the filter head 12 on the filter plate 4 and then enter the gas-liquid two-phase enhanced reaction zone 140. This is just an example, and the same applies to other stages. The size of the ozone decomposition catalyst 5 is larger than the size of the filter hole on the filter head 12, and the size of the reaction enhancement catalyst 6 is larger than the size of the filter hole on the filter head 12.

[0060] The inlet pump 7, inlet valve group 8, circulation pump 220, and compressed air supply terminal 10 can be electrically connected to the PLC system to realize the automatic inlet and outlet water regulation and automatic backwashing functions of the reactor. After the reactor body 1 is assembled as a whole, it is a cylindrical tower structure with a height-to-diameter ratio of approximately 4 to 8:1.

[0061] The wastewater treatment process of this multi-stage vertical flow ozone catalytic oxidation reactor is as follows:

[0062] The wastewater to be treated is pressurized by the inlet pump 7 and then enters the auxiliary functional area 110 of the reactor body 1 through the inlet valve group 8 and the inlet 150. At the same time, the circulation pump 220 draws wastewater from the gas-liquid two-phase enhanced reaction zone 140 through the circulation pipe 230 (if the reactor has just started up, there is no wastewater in the gas-liquid two-phase enhanced reaction zone 140, then only ozone enters the auxiliary functional area 110 from the ejector 210; this period is a special period) and pumps it into the ejector 210. At the same time, the ozone distributor 240 also sends ozone into the ejector 210. Inside, wastewater and ozone are uniformly mixed in the injector 210, and then sent to the auxiliary functional zone 110. The wastewater reacted in the auxiliary functional zone 110 is then evenly distributed through the filter plate 4 between the auxiliary functional zone 110 and the ozone catalytic decomposition zone 120 before entering the ozone catalytic decomposition zone 120. The gas-water mixture passes through the large-particle ozone decomposition catalyst 5, which accelerates the generation of a large number of free hydroxyl radicals from ozone, reacting them with pollutants in the water. The mixture then passes between the ozone catalytic decomposition zone 120 and the three-phase mixing reaction zone 130. After water is evenly distributed through filter plate 4, it enters the three-phase mixing reaction zone 130. The reaction-enhancing catalyst 6 in the three-phase mixing reaction zone 130 is in an expanded fluidized bed state. The catalyst 6 has small particle size, sufficient contact, numerous adhesion reaction sites, and high reaction efficiency, further removing pollutants from the reaction system. After reacting in the three-phase mixing reaction zone 130, the wastewater again passes through filter plate 4 between the three-phase mixing reaction zone 130 and the gas-liquid two-phase enhanced reaction zone 140 for even water distribution before entering the gas-liquid two-phase enhanced reaction zone 140. Only a gas-liquid two-phase medium is used. The pH value in the gas-liquid two-phase enhanced reaction zone 140 is monitored by an online monitoring instrument located in the area. Then, the PLC system controls the dosing system 3 to accurately add pH adjuster into the reaction system based on the feedback pH value, further removing pollutants in the system. At the same time, the inhibitory effect of the agent reduces the generation of harmful by-products of ozone decomposition. The wastewater is discharged through the outlet 160. Ozone that escapes into the air from the system is sent into the ozone exhaust gas destroyer 11 through the exhaust port 170 and treated before being discharged into the atmosphere after meeting the standards.

[0063] The advantages of this multi-stage vertical flow ozone catalytic oxidation reactor for wastewater treatment are as follows:

[0064] 1. By designing the reactor in stages and selectively filling each stage with catalysts, the function of ozone in decomposing pollutants is enhanced across different stages. This strengthens the corresponding reaction process in a single stage, promotes the reaction rate, shortens the reaction range, strengthens the catalysis of specific processes, and inhibits, regulates, and controls byproducts. At the same time, the isolation between each stage enables independent operation and maintenance of the corresponding area, providing convenient conditions for later operation and maintenance. This forms a multi-stage ozone catalytic reaction system with good treatment effect and operational advantages, which has significant advantages in removing recalcitrant organic matter in water treatment.

[0065] 2. By arranging filter plates 4 and filter heads 12 between each stage, three different reaction conditions—fixed bed, fluidized bed, and gas-liquid two-phase reaction—are achieved in a single reactor. Furthermore, the arrangement of filter plates 4 and filter heads 12 between each stage ensures that the catalyst does not flow between stages, thus achieving catalyst separation.

[0066] 3. The ozone diffusion system 2 realizes ozone diffusion while achieving internal circulation of the reactor. At the same time, it mixes the reagents added in the gas-liquid two-phase enhanced reaction zone 140 into the reaction system of the auxiliary functional zone 110, ensuring the complete decomposition of pollutants and inhibiting the generation of by-products, thus providing good operating conditions for subsequent reactions.

[0067] 4. By using online monitoring instruments and dosing system 3, a specific pH adjuster is added during the two-phase reaction stage to stabilize and control the pH value of the reaction section, enhance the specific reaction process, and inhibit the formation of harmful byproducts.

[0068] 5. The filter plate 4 and filter head 12 between the three-phase mixed reaction zone 130 and the gas-liquid two-phase enhanced reaction zone 140 ensure that the effluent does not contain catalyst. At the same time, the catalyst will not escape into the backwash drainage due to high-intensity gas washing during the gas washing process, thus ensuring the total amount of catalyst in the reactor.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor, characterized in that, include: The reactor body (1), ozone diffusion system (2), and dosing system (3) are provided. Filter plates (4) are arranged inside the reactor body (1) to divide its inner cavity from bottom to top into an auxiliary functional area (110), an ozone catalytic decomposition area (120), a three-phase mixed reaction area (130), and a gas-liquid two-phase enhanced reaction area (140). The ozone catalytic decomposition area (120) is filled with an ozone decomposition catalyst (5), and the three-phase mixed reaction area (130) is filled with a reaction enhancement catalyst (6). The reactor body (1) has an inlet (150) connected to the auxiliary functional area (110). The ozone diffusion system (2) is used to extract wastewater from the gas-liquid two-phase enhanced reaction zone (140) and mix it with ozone before sending it into the auxiliary functional area (110). The dosing system (3) is used to add pH adjuster to the gas-liquid two-phase enhanced reaction zone (140). The reactor body (1) has an outlet (160) connected to the gas-liquid two-phase enhanced reaction zone (140).

2. The multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, The inlet (150) is connected to the inlet pump (7) via the inlet valve assembly (8).

3. The multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, The outlet (160) is connected to the outlet valve assembly (13) via a pipe.

4. The multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, The ozone diffusion system (2) includes: a water jet (210), the inlet of which is connected to a circulation pipe (230) via a circulation pump (220), the circulation pipe (230) being connected to the gas-liquid two-phase enhanced reaction zone (140) of the reactor body (1), the outlet of which is connected to the auxiliary functional area (110) of the reactor body (1) via a pipe, and the suction end of which is connected to an ozone distributor (240).

5. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, An online monitoring instrument for monitoring pH value is installed in the gas-liquid two-phase enhanced reaction zone (140), and the online monitoring instrument and the dosing system (3) are electrically connected to the PLC system.

6. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, An air distributor (9) is installed in the auxiliary functional area (110), and the inlet of the air distributor (9) is connected to the compressed air supply end (10).

7. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, The top of the reactor body (1) is provided with an exhaust port (170) that communicates with the gas-liquid two-phase enhanced reaction zone (140), and the exhaust port (170) is connected to an ozone exhaust gas destroyer (11).

8. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, The volume ratio of ozone decomposition catalyst (5) filled in the ozone catalytic decomposition zone (120) is greater than 90%, and the particle size of the ozone decomposition catalyst (5) is 10 mm to 30 mm.

9. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to claim 1, characterized in that, The volume ratio of the reaction-enhancing catalyst (6) filled in the three-phase mixed reaction zone (130) is 30% to 35%, and the particle size of the reaction-enhancing catalyst (6) is 4 mm to 6 mm.

10. A multi-stage vertical flow wastewater ozone catalytic oxidation reactor according to any one of claims 1 to 9, characterized in that, Each filter hole on the filter plate (4) is provided with a filter head (12).

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