Three-grid surrounding type catalytic ozonation tower for sewage treatment

Abstract

The utility model discloses a three-grid surrounding type catalytic ozonation tower for sewage treatment. An inner cavity in a barrel is divided into a first reaction area, a second reaction area and a third reaction area by three inner partition plates; the first reaction zone, the second reaction zone, the third reaction zone and the third reaction zone are all reaction zones for catalytic ozonation of sewage, supporting layers are arranged at the positions, close to the bottoms, in the reaction zones, and catalyst filling layers are arranged on the supporting layers; a first water collecting device, a second water collecting device and a third water collecting device are respectively arranged at the positions close to the top and are sequentially connected through a first flow guide pipe and a second flow guide pipe; the first reaction zone, the second reaction zone and the third reaction zone are respectively connected with a circulating water system with a jet device; each jet device forms negative pressure in the corresponding circulating water system so as to suck ozone, and the ozone and corresponding circulating sewage are mixed and then reinjected into the first reaction zone, the second reaction zone and the third reaction zone. The device disclosed by the utility model realizes segmented feeding of ozone and staged treatment of sewage, and has higher treatment efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment construction, and particularly relates to a three-cell surrounding type ozone catalytic oxidation tower for sewage treatment. Background Art

[0002] Industrial wastewater has the characteristics of many types of pollutants, high concentration, high toxicity, complex composition, poor biodegradability, etc., and is one of the most difficult types of wastewater to treat. Especially with the implementation of the "Action Plan for the Treatment of New Pollutants". One of the main emission sources of new pollutants is industrial wastewater, and the implementation of the plan puts forward higher requirements for the treatment of industrial wastewater, including the subsequent advanced treatment of industrial wastewater treated by conventional treatment processes. Currently, the main methods for treating such wastewater include membrane filtration technology, ozone oxidation technology, photocatalytic oxidation technology, Fenton reagent oxidation technology, conventional micro-electrolysis technology, etc.

[0003] As a type of ozone oxidation technology, ozone catalytic oxidation technology has been widely used in the treatment of industrial wastewater (especially advanced treatment). The relative treatment water volume of industrial wastewater is small, and currently, it is mainly implemented in the form of a catalytic oxidation tower; for many difficult-to-treat industrial wastewaters, in order to further improve the treatment effect, multiple towers are often connected in series to treat industrial wastewater, and common forms include three-tower series connection and six-tower series connection.

[0004] On the one hand, multi-stage series connection itself is beneficial to the segmented dosing of ozone, improving ozone utilization rate and treatment effect;

[0005] On the other hand, different catalysts can be filled in different towers, so as to more specifically treat some special pollutants in industrial sewage; and other oxidants, such as hydrogen peroxide, can be supplemented in different towers to realize the combination of related processes.

[0006] Although the existing technology has been able to solve some problems, when the ozone catalytic oxidation process is used to treat industrial wastewater, multiple ozone catalytic oxidation towers are often connected in series; and when multiple towers are connected in series, it often occupies a large area, has a high construction cost, and there are also many over-flow pipes and valves between the towers, and the operation is complex.

[0007] Therefore, how to achieve the efficient treatment of industrial wastewater and reduce the construction cost of sewage treatment equipment has become an urgent technical problem for those skilled in the art. Summary of the Utility Model

[0008] In view of the above-mentioned defects of the existing technology, the utility model provides a three-cell surrounding type ozone catalytic oxidation tower for sewage treatment, and the purpose is to achieve the efficient treatment of industrial wastewater and reduce the construction cost of sewage treatment equipment.

[0009] To achieve the above object, the utility model discloses a three-cell surrounding ozone catalytic oxidation tower for sewage treatment, which includes a cylinder body.

[0010] Three inner partitions extending vertically are arranged around the central line inside the cylinder body, and the inner cavity is divided into a first reaction zone, a second reaction zone and a third reaction zone by the three inner partitions;

[0011] The first reaction zone, the second reaction zone and the third reaction zone are all reaction zones for ozone catalytic oxidation of sewage. A supporting layer is provided near the bottom inside each of them, a catalyst filling layer is provided on each of the supporting layers, and a first water collecting device, a second water collecting device and a third water collecting device are respectively provided near the top;

[0012] An inlet is provided on the outer side wall near the bottom of the first reaction zone;

[0013] An outlet connected to the third water collecting device is provided near the top of the third reaction zone;

[0014] A first diversion pipe is provided between the first water collecting device of the first reaction zone and the position near the bottom of the second reaction zone, and the first reaction zone and the second reaction zone are connected through the first diversion pipe;

[0015] A second diversion pipe is provided between the second water collecting device of the second reaction zone and the position near the bottom of the third reaction zone, and the second reaction zone and the third reaction zone are connected through the second diversion pipe;

[0016] The first reaction zone, the second reaction zone and the third reaction zone are respectively connected to a circulating water system with a jet pump;

[0017] A first circulating water outlet is provided on the side wall of the first reaction zone above the corresponding catalyst filling layer, and a first circulating water inlet is provided on the side wall near the bottom. The first reaction zone is connected to the corresponding circulating water system through the first circulating water outlet and the first circulating water inlet;

[0018] A second circulating water outlet is provided on the side wall of the second reaction zone above the corresponding catalyst filling layer, and a second circulating water inlet is provided on the side wall near the bottom. The second reaction zone is connected to the corresponding circulating water system through the second circulating water outlet and the second circulating water inlet;

[0019] A third circulating water outlet is provided on the side wall of the third reaction zone above the corresponding catalyst filling layer, and a third circulating water inlet is provided on the side wall near the bottom. The third reaction zone is connected to the corresponding circulating water system through the third circulating water outlet and the third circulating water inlet;

[0020] Each of the ejectors forms a negative pressure in the corresponding circulating water system to suck in ozone, and then mixes the ozone with the corresponding circulating sewage and reinjects it into the first reaction zone, the second reaction zone, and the third reaction zone.

[0021] Preferably, different catalysts are filled in the three catalyst packing layers of the first reaction zone, the second reaction zone, and the third reaction zone.

[0022] Preferably, a first clear water inlet is provided near the bottom of the first reaction zone, and a first clear water outlet is provided near the top. By inputting clear water from the first clear water inlet and outputting it from the first clear water outlet, the inside of the first reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out;

[0023] A second clear water inlet is provided near the bottom of the second reaction zone, and a second clear water outlet is provided near the top. By inputting clear water from the second clear water inlet and outputting it from the second clear water outlet, the inside of the second reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out;

[0024] A third clear water inlet is provided near the bottom of the third reaction zone, and a third clear water outlet is provided near the top. By inputting clear water from the third clear water inlet and outputting it from the third clear water outlet, the inside of the first reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out.

[0025] Preferably, a first backwashing air inlet is provided near the bottom of the first reaction zone, and the intercepted particulate matter and suspended matter in the support layer and the catalyst packing layer inside the first reaction zone are flushed by the pressurized air flow input from the first backwashing air inlet;

[0026] A second backwashing air inlet is provided near the bottom of the second reaction zone, and the intercepted particulate matter and suspended matter in the support layer and the catalyst packing layer inside the second reaction zone are flushed by the pressurized air flow input from the second backwashing air inlet;

[0027] A third backwashing air inlet is provided near the bottom of the third reaction zone, and the intercepted particulate matter and suspended matter in the support layer and the catalyst packing layer inside the third reaction zone are flushed by the pressurized air flow input from the third backwashing air inlet.

[0028] Preferably, a first vent port, a second vent port, and a third vent port are respectively provided near the bottom of the first reaction zone, the second reaction zone, and the third reaction zone. The internal sewage can be emptied by opening the corresponding first vent port, the corresponding second vent port, or the corresponding third vent port.

[0029] Preferably, a first discharge port, a second discharge port and a third discharge port are respectively arranged above the corresponding supporting layer in the first reaction zone and the second reaction zone. The packing materials of the corresponding supporting layer and the corresponding catalyst packing layer can be discharged by opening the corresponding first discharge port, the corresponding second discharge port or the corresponding third discharge port.

[0030] Preferably, a first lower inspection opening is arranged on the side wall near the bottom of the first reaction zone, and a first upper inspection opening is arranged on the side wall near the top;

[0031] A second lower inspection opening is arranged on the side wall near the bottom of the second reaction zone, and a second upper inspection opening is arranged on the side wall near the top;

[0032] A third lower inspection opening is arranged on the side wall near the bottom of the third reaction zone, and a third upper inspection opening is arranged on the side wall near the top;

[0033] A top inspection opening communicating with the first reaction zone, the second reaction zone and the third reaction zone is arranged at the top of the cylinder body;

[0034] The user can enter the corresponding area inside the cylinder body through the first lower inspection opening, the first upper inspection opening, the second lower inspection opening, the second upper inspection opening, the third lower inspection opening, the third upper inspection opening or the top inspection opening.

[0035] Preferably, a breathing valve is arranged at the top of the cylinder body.

[0036] Preferably, an exhaust port is arranged at the top of the cylinder body, and a tail gas destruction device is connected through the exhaust port;

[0037] The tail gas destruction device is used to destroy the unreacted ozone-containing gas.

[0038] Advantages of the present utility model:

[0039] The present utility model realizes segmented ozone addition and hierarchical sewage treatment, and different catalysts can be filled in the three reaction zones, further improving the treatment effect, so it has higher treatment efficiency.

[0040] The concept, specific structure and technical effects of the present utility model will be further described below in conjunction with the drawings to fully understand the purpose, features and effects of the present utility model. Description of the Drawings

[0041] Figure 1 A schematic structural diagram of one side of the first reaction zone in an embodiment of the present utility model is shown.

[0042] Figure 2Shows a schematic structural diagram of one side of the first reaction zone and the second reaction zone in an embodiment of the present utility model.

[0043] Figure 3 Shows a schematic structural diagram of one side of the first reaction zone and the third reaction zone in an embodiment of the present utility model.

[0044] Figure 4 Shows a schematic structural diagram of one side of the second reaction zone and the third reaction zone in an embodiment of the present utility model.

[0045] Figure 5 Shows a schematic structural diagram of the top in an embodiment of the present utility model. Detailed implementation manners

[0046] Embodiment

[0047] As Figures 1 to 5 shown, a three - cell surrounding - type ozone catalytic oxidation tower for sewage treatment includes a cylinder a.

[0048] Inside the cylinder a, three inner partitions b, c, and d extending vertically along the center line are provided, and the inner cavity is divided into a first reaction zone, a second reaction zone, and a third reaction zone by the three inner partitions b, c, and d;

[0049] The first reaction zone, the second reaction zone, and the third reaction zone are all reaction zones for ozone - catalytic oxidation of sewage. At the position near the bottom inside, a supporting layer e is provided, a catalyst filling layer f is provided on the supporting layer e, and a first water collection device g, a second water collection device i, and a third water collection device k are respectively provided at positions near the top;

[0050] On the outer wall of the first reaction zone near the bottom position, a water inlet N1 is provided;

[0051] At the position near the top of the third reaction zone, a water outlet N2 connected to the third water collection device k is provided;

[0052] Between the first water collection device g of the first reaction zone and the position near the bottom of the second reaction zone, a first diversion pipe h is provided, and the first reaction zone and the second reaction zone are connected through the first diversion pipe h;

[0053] Between the second water collection device i of the second reaction zone and the position near the bottom of the third reaction zone, a second diversion pipe j is provided, and the second reaction zone and the third reaction zone are connected through the second diversion pipe j;

[0054] The first reaction zone, the second reaction zone, and the third reaction zone are respectively connected to a circulating water system with ejectors;

[0055] The side wall of the first reaction zone located above the corresponding catalyst packing layer f is provided with a first circulating water outlet N13, and the side wall near the bottom is provided with a first circulating water inlet N12, which is connected to the corresponding circulating water system through the first circulating water outlet N13 and the first circulating water inlet N12;

[0056] The side wall of the second reaction zone located above the corresponding catalyst packing layer f is provided with a second circulating water outlet N15, and the side wall near the bottom is provided with a second circulating water inlet N14, which is connected to the corresponding circulating water system through the second circulating water outlet N15 and the second circulating water inlet N14;

[0057] The side wall of the third reaction zone located above the corresponding catalyst packing layer f is provided with a third circulating water outlet N17, and the side wall near the bottom is provided with a third circulating water inlet N16, which is connected to the corresponding circulating water system through the third circulating water outlet N17 and the third circulating water inlet N16;

[0058] Each ejector forms a negative pressure in the corresponding circulating water system to suck in ozone, and then mixes the ozone with the corresponding circulating sewage and reinjects it into the first reaction zone, the second reaction zone and the third reaction zone.

[0059] In practical applications, the sewage enters the bottom of the first reaction zone through the water inlet N1, and then passes through the corresponding supporting layer e and the catalyst packing layer f. After being collected by the first water collecting device g, it enters the bottom of the second reaction zone through the first diversion pipe h;

[0060] Then it continues to flow through the supporting layer e and the catalyst packing layer f of the second reaction zone. After being collected by the second water collecting device i, it enters the bottom of the third reaction through the second diversion pipe j;

[0061] Then it continues to flow through the supporting layer e and the catalyst packing layer f of the third reaction zone. After passing through the third water collecting device k, it enters the subsequent treatment process unit through the water outlet N2.

[0062] The inner partitions b, c, and d divide the cylindrical region formed by the cylinder a into a first reaction zone, a second reaction zone, and a third reaction zone for ozone catalytic oxidation of sewage;

[0063] The first reaction zone, the second reaction zone, and the third reaction zone are respectively filled with supporting materials and catalysts;

[0064] Ozone is added in the form of "jet" respectively at the same time, and for the possible fouling caused by suspended solids, "air backwashing" and "water backwashing" are both carried out to avoid blockage. Since ozone is added in the form of "jet", the first reaction zone, the second reaction zone and the third reaction zone are respectively provided with a first circulating water inlet N12, a second circulating water inlet N14, a third circulating water inlet N16, and a first circulating water outlet N13, a second circulating water outlet N15, a third circulating water outlet N17.

[0065] In each circulating water system with a jet injector, the sewage is pumped into the jet injector through the corresponding first circulating water outlet N13, second circulating water outlet N15 or third circulating water outlet N17 by a pump. The jet injector forms a negative pressure and simultaneously inhales ozone to realize the mixing of ozone and sewage, and then returns to the bottom of the first reaction zone, the second reaction zone or the third reaction zone through the corresponding first circulating water inlet N12, second circulating water inlet N14 or third circulating water inlet N16 to realize the addition of ozone.

[0066] In the first reaction zone, the second reaction zone and the third reaction zone, the sewage mixed with ozone returns to the bottom of the first reaction zone, the second reaction zone or the third reaction zone through the corresponding first circulating water inlet N12, second circulating water inlet N14 or third circulating water inlet N16 respectively, and then sequentially flows through the corresponding supporting layer e and the catalyst packing layer f, contacts the catalyst in the catalyst packing layer f, and undergoes a catalytic degradation reaction. As the cycle continues, ozone is continuously dissolved and reacts. The wastewater after passing through the first reaction zone, the second reaction zone and the third reaction zone passes through the third water collection device k and then enters the subsequent treatment process unit through the water outlet N2.

[0067] In some embodiments, the three catalyst packing layers f in the first reaction zone, the second reaction zone and the third reaction zone are filled with different catalysts.

[0068] In some embodiments, a first clear water inlet N3 is provided near the bottom of the first reaction zone, and a first clear water outlet N4 is provided near the top. By inputting clear water from the first clear water inlet N3 and outputting it from the first clear water outlet N4, the first reaction zone is flushed, and the intercepted particulate matter and suspended solids are carried out.

[0069] A second clear water inlet N5 is provided near the bottom of the second reaction zone, and a second clear water outlet N6 is provided near the top. By inputting clear water from the second clear water inlet N5 and outputting it from the second clear water outlet N6, the second reaction zone is flushed, and the intercepted particulate matter and suspended solids are carried out.

[0070] The third reaction zone is provided with a third clean water inlet N7 near the bottom position and a third clean water outlet N8 near the top position. By inputting clean water from the third clean water inlet N7 and outputting it from the third clean water outlet N8, the first reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out.

[0071] In practical applications, after air backwashing, the first clean water inlet N3, the second clean water inlet N5, and the third clean water inlet N7 can be opened to perform water backwashing on the first reaction zone, the second reaction zone, and the third reaction zone respectively. The backwashing water and the washed-down substances are discharged from the first clean water outlet N4, the second clean water outlet N6, and the third clean water outlet N8 respectively.

[0072] In some embodiments, the first reaction zone is provided with a first backwashing air inlet N9 near the bottom position. The intercepted particulate matter and suspended matter in the support layer e and the catalyst filling layer f inside the first reaction zone are flushed by the pressurized air flow input from the first backwashing air inlet N9.

[0073] The second reaction zone is provided with a second backwashing air inlet N10 near the bottom position. The intercepted particulate matter and suspended matter in the support layer e and the catalyst filling layer f inside the second reaction zone are flushed by the pressurized air flow input from the second backwashing air inlet N10.

[0074] The third reaction zone is provided with a third backwashing air inlet N11 near the bottom position. The intercepted particulate matter and suspended matter in the support layer e and the catalyst filling layer f inside the third reaction zone are flushed by the pressurized air flow input from the third backwashing air inlet N11.

[0075] In some embodiments, the first reaction zone, the second reaction zone, and the third reaction zone are respectively provided with a first vent N18, a second vent N19, and a third vent 20 near the bottom position. The internal sewage can be emptied by opening the corresponding first vent N18, the corresponding second vent N19, or the corresponding third vent 20.

[0076] In some embodiments, the first reaction zone and the second reaction zone are respectively provided with a first discharge port N27, a second discharge port N28, and a third discharge port 29 near the position above the corresponding support layer e. The filling materials of the corresponding support layer e and the corresponding catalyst filling layer f can be discharged by opening the corresponding first discharge port N27, the corresponding second discharge port N28, or the corresponding third discharge port 29.

[0077] In some embodiments, the side wall of the first reaction zone near the bottom is provided with a first lower maintenance opening N22, and the side wall near the top is provided with a first upper maintenance opening N21.

[0078] On the side wall near the bottom of the second reaction zone, there is a second lower maintenance opening N24, and on the side wall near the top, there is a second upper maintenance opening N23;

[0079] On the side wall near the bottom of the third reaction zone, there is a third lower maintenance opening N26, and on the side wall near the top, there is a third upper maintenance opening N25;

[0080] On the top of the cylinder body a, there is a top maintenance opening N32 that communicates with the first reaction zone, the second reaction zone, and the third reaction zone;

[0081] The user can enter the corresponding area inside the cylinder body a through the first lower maintenance opening N22, the first upper maintenance opening N21, the second lower maintenance opening N24, the second upper maintenance opening N23, the third lower maintenance opening N26, the third upper maintenance opening N25, or the top maintenance opening N32.

[0082] In some embodiments, a breather valve N31 is provided on the top of the cylinder body a.

[0083] In some embodiments, an exhaust port N30 is provided on the top of the cylinder body a, and a tail gas destruction device is connected through the exhaust port N30;

[0084] The tail gas destruction device is used to destroy the unreacted ozone-containing gas.

[0085] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A three-cell surrounding type ozone catalytic oxidation tower for sewage treatment, comprising a cylinder body (a); characterized in that, Inside the cylinder body (a), three inner partition plates (b, c, d) extending vertically along the central line are provided, and the inner cavity is divided into a first reaction zone, a second reaction zone, and a third reaction zone by the three inner partition plates (b, c, d); The first reaction zone, the second reaction zone, and the third reaction zone are all reaction zones for ozone catalytic oxidation of sewage. A support layer (e) is provided near the bottom inside each of them, a catalyst filling layer (f) is provided on each of the support layers (e), and a first water collection device (g), a second water collection device (i), and a third water collection device (k) are respectively provided near the top; An inlet (N1) is provided on the outer side wall of the first reaction zone near the bottom; An outlet (N2) connected to the third water collection device (k) is provided at a position near the top of the third reaction zone; A first diversion pipe (h) is provided between the first water collection device (g) of the first reaction zone and a position near the bottom of the second reaction zone, and the first reaction zone and the second reaction zone are communicated through the first diversion pipe (h); A second diversion pipe (j) is provided between the second water collection device (i) of the second reaction zone and a position near the bottom of the third reaction zone, and the second reaction zone and the third reaction zone are communicated through the second diversion pipe (j); The first reaction zone, the second reaction zone, and the third reaction zone are respectively connected to a circulating water system with ejectors; A first circulating water outlet (N13) is provided on the side wall of the first reaction zone at a position above the corresponding catalyst filling layer (f), and a first circulating water inlet (N12) is provided on the side wall near the bottom. The first reaction zone is connected to the corresponding circulating water system through the first circulating water outlet (N13) and the first circulating water inlet (N12); A second circulating water outlet (N15) is provided on the side wall of the second reaction zone at a position above the corresponding catalyst filling layer (f), and a second circulating water inlet (N14) is provided on the side wall near the bottom. The second reaction zone is connected to the corresponding circulating water system through the second circulating water outlet (N15) and the second circulating water inlet (N14); A third circulating water outlet (N17) is provided on the side wall of the third reaction zone at a position above the corresponding catalyst filling layer (f), and a third circulating water inlet (N16) is provided on the side wall near the bottom. The third reaction zone is connected to the corresponding circulating water system through the third circulating water outlet (N17) and the third circulating water inlet (N16); Each ejector forms a negative pressure in the corresponding circulating water system to suck in ozone, and then mixes the ozone with the corresponding circulating sewage and reinjects it into the first reaction zone, the second reaction zone, and the third reaction zone.

2. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, wherein The three catalyst filling layers (f) of the first reaction zone, the second reaction zone, and the third reaction zone are filled with different catalysts.

3. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that The first reaction zone is provided with a first clean water inlet (N3) near the bottom and a first clean water outlet (N4) near the top. By inputting clean water from the first clean water inlet (N3) and outputting it from the first clean water outlet (N4), the first reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out. The second reaction zone is provided with a second clean water inlet (N5) near the bottom and a second clean water outlet (N6) near the top. By inputting clean water from the second clean water inlet (N5) and outputting it from the second clean water outlet (N6), the second reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out. The third reaction zone is provided with a third clean water inlet (N7) near the bottom and a third clean water outlet (N8) near the top. By inputting clean water from the third clean water inlet (N7) and outputting it from the third clean water outlet (N8), the first reaction zone is flushed, and the intercepted particulate matter and suspended matter are carried out.

4. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that, The first reaction zone is provided with a first backwashing air inlet (N9) near the bottom. The intercepted particulate matter and suspended matter in the support layer (e) and the catalyst packing layer (f) inside the first reaction zone are flushed by the pressurized air flow input from the first backwashing air inlet (N9). The second reaction zone is provided with a second backwashing air inlet (N10) near the bottom. The intercepted particulate matter and suspended matter in the support layer (e) and the catalyst packing layer (f) inside the second reaction zone are flushed by the pressurized air flow input from the second backwashing air inlet (N10). The third reaction zone is provided with a third backwashing air inlet (N11) near the bottom. The intercepted particulate matter and suspended matter in the support layer (e) and the catalyst packing layer (f) inside the third reaction zone are flushed by the pressurized air flow input from the third backwashing air inlet (N11).

5. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that, The first reaction zone, the second reaction zone, and the third reaction zone are respectively provided with a first vent port (N18), a second vent port (N19), and a third vent port (20) near the bottom. The internal sewage can be emptied by opening the corresponding first vent port (N18), the corresponding second vent port (N19), or the corresponding third vent port (20).

6. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that, The first reaction zone and the second reaction zone are respectively provided with a first discharge port (N27), a second discharge port (N28), and a third discharge port (29) near the position above the corresponding support layer (e). The packing materials of the corresponding support layer (e) and the corresponding catalyst packing layer (f) can be discharged by opening the corresponding first discharge port (N27), the corresponding second discharge port (N28), or the corresponding third discharge port (29).

7. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, wherein The side wall of the first reaction zone near the bottom is provided with a first lower maintenance opening (N22), and the side wall near the top is provided with a first upper maintenance opening (N21). The side wall of the second reaction zone near the bottom is provided with a second lower maintenance opening (N24), and the side wall near the top is provided with a second upper maintenance opening (N23); The side wall of the third reaction zone near the bottom is provided with a third lower maintenance opening (N26), and the side wall near the top is provided with a third upper maintenance opening (N25); The top of the cylinder body (a) is provided with a top maintenance opening (N32) communicating with the first reaction zone, the second reaction zone and the third reaction zone; The user can enter the corresponding area inside the cylinder body (a) through the first lower maintenance opening (N22), the first upper maintenance opening (N21), the second lower maintenance opening (N24), the second upper maintenance opening (N23), the third lower maintenance opening (N26), the third upper maintenance opening (N25) or the top maintenance opening (N32).

8. The three-cell surrounding type ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that, The top of the cylinder body (a) is provided with a breather valve (N31).

9. The three-cell surrounding ozone catalytic oxidation tower for sewage treatment according to claim 1, characterized in that, The top of the cylinder body (a) is provided with an exhaust port (N30), and the exhaust port (N30) is connected to a tail gas destruction device; The tail gas destruction device is used for destroying the unreacted ozone-containing gas.

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