Ozone catalytic oxidation tower

Abstract

This utility model relates to the field of water treatment technology and discloses an ozone catalytic oxidation tower. The ozone catalytic oxidation tower includes a tower body and functional components disposed within the tower body. The functional components, from bottom to top, include: a water distribution component for distributing wastewater to be treated; an aeration component for dispersing ozone gas into microbubbles and allowing them to rise in parallel with the wastewater from the water distribution component; a catalyst support component for catalytically oxidizing pollutants in the wastewater, the catalyst support component, from bottom to top, including a beam-shaped gas jet support structure, a lower packing layer, a catalyst bed, an upper packing layer, and a packing gland; a fluid control component for discharging the treated water outside the tower; and a foam suppression component for eliminating foam generated during the treatment process. Using this ozone catalytic oxidation tower for water treatment can improve aeration and bubble distribution effects, thereby increasing COD removal efficiency.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to an ozone catalytic oxidation tower. Background Technology

[0002] Ozone catalytic oxidation technology is a strong oxidizing treatment technology used to remove pollutants from wastewater and reduce its COD (Chemical Oxygen Demand). It is typically used at the end of wastewater treatment processes to improve ozone utilization and catalytic efficiency, reduce ozone residue, and enhance ozone catalytic efficiency. This technology is particularly suitable for advanced treatment stages in various wastewater treatment industries, such as landfill leachate, pharmaceutical wastewater, industrial park wastewater, oil refining and petrochemical wastewater, pesticide wastewater, textile dyeing and printing wastewater, coal chemical wastewater, and coking wastewater.

[0003] Existing ozone oxidation technology mainly consists of several parts, including an ozone catalytic oxidation tower, a catalyst, an ozone aeration system, and an inlet / outlet water system. Furthermore, existing ozone catalytic oxidation towers often employ a counter-current flow pattern, resulting in relatively low ozone utilization and a tendency to generate air resistance and siphon effects. The aerators used are swirl-mixing aerators, which, while achieving uniform gas distribution, produce larger bubbles, leading to incomplete contact and reaction between ozone and organic matter. The catalytic oxidation tower typically contains a catalyst support layer, currently supported by a grid with a wire mesh on top. This method has poor support capacity, relatively high weight, and high cost. Additionally, when the wastewater contains large amounts of organic matter and surfactants, a large number of bubbles may be generated during treatment, affecting the exhaust gas treatment effect after entering the tail gas disruptor. Utility Model Content

[0004] The purpose of this invention is to overcome the problem of low ozone utilization in existing technologies and to provide an ozone catalytic oxidation tower. This ozone catalytic oxidation tower can be used for water treatment. Using this ozone catalytic oxidation tower for water treatment can improve aeration and bubble distribution, while reducing weight, increasing load-bearing capacity, increasing free cross-sectional area, ensuring stable and efficient operation of the ozone catalytic oxidation tower, and improving COD removal efficiency.

[0005] To achieve the above objectives, this utility model provides an ozone catalytic oxidation tower, which includes a tower body and functional components disposed within the tower body; the functional components, from bottom to top, include:

[0006] Water distribution assembly, used to distribute wastewater to be treated;

[0007] An aeration assembly is used to disperse ozone gas into microbubbles and to rise in parallel with the wastewater to be treated from the water distribution assembly.

[0008] A catalyst support assembly is used for the catalytic oxidation of pollutants in wastewater to be treated; the catalyst support assembly, from bottom to top, includes a beam-shaped gas jet support structure, a lower packing layer, a catalyst bed layer, an upper packing layer, and a packing gland.

[0009] Fluid control components are used to direct the treated water out of the tower;

[0010] Foam suppression components are used to eliminate foam generated during the processing.

[0011] Preferably, the tower body is a cylindrical pressure vessel with elliptical heads at both the top and bottom.

[0012] Preferably, the water distribution assembly adopts a perforated water distribution pipe type.

[0013] Preferably, the aeration component adopts a uniformly distributed titanium flat aeration disc with an aeration pore size ≤10μm.

[0014] Preferably, the beam-shaped gas jet support structure adopts a beam-shaped gas jet packing support plate, which is covered with long waist holes and has a camel hump shape.

[0015] Preferably, the free section ratio of the beam-shaped gas jet packing support plate is ≥100%, and it is fixed to the inner wall of the tower body by a ring plate and steel profile.

[0016] Preferably, the lower filler layer consists of at least two layers of inert ceramic balls with different particle sizes, wherein the particle size of the lower layer of inert ceramic balls is larger than that of the upper layer of inert ceramic balls.

[0017] Preferably, the upper filler layer consists of at least two layers of inert ceramic balls with different particle sizes, wherein the particle size of the lower layer of inert ceramic balls is smaller than that of the upper layer of inert ceramic balls.

[0018] Preferably, the fluid control component adopts a circular annular overflow weir or a circular rectangular overflow weir.

[0019] Preferably, the foam suppression component is a spray defoaming device, and the spray defoaming device is provided with at least one set of solid spiral nozzles.

[0020] Preferably, the bottom and top of the tower body are respectively provided with a drain port and an exhaust port.

[0021] Preferably, the tower body is provided with a water inlet, an air inlet, a water outlet, and a spray nozzle; wherein, the water inlet is connected to the water distribution component; the air inlet is connected to the aeration component; the water outlet is located below the fluid control component; and the spray nozzle is connected to the foam suppression component.

[0022] The beneficial technical effects achieved by this utility model through the above technical solution are as follows:

[0023] This invention's ozone catalytic oxidation tower employs a gas-water co-flow pattern, improving ozone utilization and thus increasing wastewater COD removal rate. This ozone catalytic oxidation tower can be used for advanced wastewater treatment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an ozone catalytic oxidation tower provided in one embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Tower body 2-Water distribution assembly 3-Aeration assembly

[0027] 4-Gas injection support structure; 5-Catalyst bed; 5a-Lower packing layer

[0028] 5b-Upper packing layer; 6-Packing gland; 7-Fluid control assembly

[0029] 8-Foam suppression component 101-Drain outlet 102-Inlet

[0030] 103 - Air inlet; 104 - Discharge port; 105 - Loading port

[0031] 106 - Water outlet; 107 - Spray nozzle; 108 - Vent outlet

[0032] 109-Inspection Port 110-Inspection Port Detailed Implementation

[0033] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0034] In the description of this application, the term "comprising" and any variations thereof mean a non-exclusive inclusion, the possible presence or addition of one or more other features, units, components, and / or combinations thereof. Furthermore, unless expressly specified and limited otherwise, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium, or a connection within two elements. Those skilled in the art will understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] This invention provides an ozone catalytic oxidation tower, such as... Figure 1 As shown, the ozone catalytic oxidation tower includes a tower body 1 and functional components disposed within the tower body 1; the functional components, from bottom to top, include:

[0036] Water distribution component 2 is used to distribute the wastewater to be treated;

[0037] Aeration component 3 is used to disperse ozone gas into microbubbles and to flow upwards in parallel with the wastewater to be treated from the water distribution component 2;

[0038] A catalyst support assembly is used for the catalytic oxidation of pollutants in wastewater to be treated. The catalyst support assembly includes, from bottom to top, a beam-shaped gas injection support structure 4, a lower packing layer 5a, a catalyst bed layer 5, an upper packing layer 5b, and a packing gland 6.

[0039] Fluid control component 7 is used to direct the treated water out of the tower;

[0040] Foam suppression component 8 is used to eliminate foam generated during the processing.

[0041] According to this utility model, the catalyst bed 5 is sandwiched between the lower packing layer 5a and the upper packing layer 5b, and the above layers are separated by wire mesh.

[0042] According to this utility model, a packing cap is provided on the upper part of the catalyst layer to prevent the catalyst from being carried out of the oxidation tower by the medium when the treatment process involves large amounts of water or air.

[0043] According to this utility model, the catalyst adopts a modular filling type. The beam-type gas injection support structure uses a modular filling type for the packing material. The modular filling uses metal mesh boxes, which are filled with catalyst in compartments and blocks. For example, this modular catalyst is installed using metal mesh boxes, which are welded from angle steel and reinforced with stainless steel mesh. The size of the mesh box is determined according to the reactor manhole size and the catalyst loading amount. The manhole is constructed with a mesh cage measuring 300*300*1000mm for easy manhole transport and internal assembly. Gaps at the mesh cage's fixing and splicing points are sealed with pressure caps. The catalyst is a specialized ozone catalytic oxidation catalyst, an alumina-based supported catalyst loaded with multiple active components such as rhodium, iridium, and tin. A modular filling method is used, reducing the workload of catalyst addition and unloading, and also avoiding the channeling problem that easily occurs with loosely stacked catalysts.

[0044] According to this utility model, the ozone catalytic oxidation tower can be used for water treatment, such as sewage treatment. Using this ozone catalytic oxidation tower for water treatment can improve the aeration and bubble distribution effect, while reducing weight, increasing load-bearing capacity, increasing free cross-sectional area, ensuring stable and efficient operation of the ozone catalytic oxidation tower, and improving COD removal effect.

[0045] The ozone catalytic oxidation tower of this invention can be used for advanced wastewater treatment. The size of the ozone catalytic oxidation tower can be determined according to the water volume, water quality, residence time, etc. All functional components inside the tower are internal components.

[0046] According to some embodiments of this utility model, the tower body 1 is a cylindrical pressure vessel with elliptical heads at both the top and bottom.

[0047] According to this utility model, the tower body 1 is a cylindrical metal device with an elliptical head, and the material is generally carbon steel lined with plastic, 304 stainless steel, 316L stainless steel or 2205 duplex steel.

[0048] According to some embodiments of this utility model, the water distribution component 2 adopts a perforated water distribution pipe type.

[0049] According to this utility model, the water distribution component plays the role of uniform water distribution. It can be a perforated water distribution pipe with evenly distributed round holes. The pipe diameter, hole diameter and number of holes are determined according to the single tower processing capacity.

[0050] According to some embodiments of this utility model, the aeration component 3 adopts a uniformly distributed titanium flat aeration disc with an aeration hole diameter ≤10μm.

[0051] According to this utility model, the aeration component is a uniformly distributed aeration device made of corrosion-resistant metal or alloy, preferably a titanium flat plate aeration disc. The number of aeration discs is determined according to the air flow rate. Ozone is refined into bubbles with a particle size of less than 10μm through the aeration disc. The ozone bubbles are fully mixed with the wastewater and dissolved in the water. The ozone gas forms microbubbles through the device and rises in parallel with the sewage, thereby improving the oxidation efficiency of ozone.

[0052] According to some embodiments of this utility model, the beam-shaped gas jet support structure 4 adopts a beam-shaped gas jet packing support plate, which is covered with long waist holes and has a camel hump shape.

[0053] According to some embodiments of this utility model, the free cross-sectional ratio of the beam-shaped gas jet packing support plate is ≥100%, and it is fixed to the inner wall of the tower body 1 by a ring plate and steel profile.

[0054] According to this invention, the beam-shaped gas-jet support plate can provide over 100% free cross-section. More importantly, due to the concave-convex geometry of the support plate, the upper part of the support plate is filled with loose packing. After the packing is installed, only a small portion of the openings are blocked by the packing, thus preserving a sufficiently large effective free cross-section. This type of support plate reduces its own weight while increasing its load-bearing capacity. The support plate is fixed by the equipment ring plate and the steel structure.

[0055] According to some embodiments of the present invention, the lower filler layer 5a is composed of at least two layers of inert ceramic balls with different particle sizes, wherein the particle size of the lower layer of inert ceramic balls is larger than that of the upper layer of inert ceramic balls.

[0056] According to some embodiments of the present invention, the upper filler layer 5b is composed of at least two layers of inert ceramic balls with different particle sizes, wherein the particle size of the lower layer of inert ceramic balls is smaller than that of the upper layer of inert ceramic balls.

[0057] According to this utility model, the problem of catalyst bed blockage is solved by using inert graded packing.

[0058] According to this invention, the specifications of the inert ceramic balls are graded according to the catalyst particle size. For example, first, large ceramic balls are used to fill the support plate, followed by 100mm balls. Smaller ceramic balls (100mm each) are then placed on top of the larger ones, and ozone catalyst is placed on top of the ceramic balls. The amount of ozone catalyst is determined according to the process parameters. Large and small ceramic balls (100mm each) are placed on top of the larger ones, separated by wire mesh to prevent the ceramic balls from sinking. A packing cap is provided on top of the ceramic balls to prevent the catalyst from being carried out by the fluid inside the tower.

[0059] This invention employs a composite structure combining a beam-shaped gas jet support plate with graded ceramic balls, increasing the free cross-sectional ratio to over 100% and solving the problem of catalyst bed blockage.

[0060] According to some embodiments of the present invention, the fluid control component 7 adopts a circular annular overflow weir or a circular rectangular overflow weir.

[0061] This invention features an overflow weir to ensure that wastewater inside the tower is discharged evenly outside the tower.

[0062] According to some embodiments of the present invention, the foam suppression component 8 adopts a spray defoaming device, and the spray defoaming device is provided with at least one set of solid spiral nozzles.

[0063] According to this invention, a sprayer is installed in the gas phase space at the top of the tower. Solid spiral nozzles are evenly distributed according to the spray area to eliminate foam in the gas-liquid mixture, ensuring that no large amount of foam is generated inside the tower when treating high-concentration wastewater. The number of solid spiral nozzles can be adjusted according to actual conditions, such as one, two, or three sets.

[0064] According to some embodiments of the present invention, the bottom and top of the tower body 1 are respectively provided with a drain port 101 and an exhaust port 108.

[0065] According to this utility model, the bottom of the tower body is provided with a vent 101 for venting the ozone catalytic oxidation tower; the top of the tower body is provided with an exhaust port 108 for discharging the exhaust gas inside the tower to the exhaust gas treatment system.

[0066] According to some embodiments of this utility model, the tower body 1 is provided with a water inlet 102, an air inlet 103, a water outlet 106, and a spray nozzle 107; wherein, the water inlet 102 is connected to the water distribution component 2; the air inlet 103 is connected to the aeration component 3; the water outlet 106 is located on the lower side of the fluid control component 7; and the spray nozzle 107 is connected to the foam suppression component 8.

[0067] According to this invention, both the water inlet 102 and the air inlet 103 are located at the bottom of the tower body 1, thus simultaneously providing both water backwashing and air washing functions. The air washing intensity is 15-25 L / m³. 2 / s, washing strength 5-10L / m 2 / s, backwash time is about 5 minutes.

[0068] According to this utility model, such as Figure 1 As shown, the tower body 1 is also provided with a discharge port 104 and a loading port 105. The discharge port 104 is located on the lower side of the catalyst bed 5, and the loading port 105 is located on the lower side of the catalyst bed 5.

[0069] According to this utility model, the tower body 1 is also provided with inspection ports 109 and 110, as well as a drain port, a tail gas emission port, a spare port, a loading manhole, a unloading port, and a lifting platform, etc.

[0070] This invention solves the long-standing contradiction between ozone mass transfer efficiency and bed blockage through the synergistic effect of air-water co-flow and beam-type support; and solves the foam problem in wastewater treatment by combining graded packing layer with spray defoaming.

[0071] The ozone catalytic oxidation tower of this invention can be used for water treatment, and the water treatment method includes the following steps:

[0072] The wastewater to be treated and ozone are introduced into the ozone catalytic oxidation tower through a gas-water co-flow process, causing ozone microbubbles to rise synchronously with the wastewater to be treated; in the presence of a catalyst, the pollutants in the wastewater to be treated are catalytically oxidized.

[0073] According to this invention, by employing a gas-water co-flow method, ozone utilization is improved, and wastewater COD removal rate is further increased, significantly reducing operating costs. The ozone catalytic oxidation tower of this invention can be used for advanced wastewater treatment.

[0074] According to this utility model, the foam suppression component 8 can eliminate foam generated during the processing.

[0075] According to some embodiments of this utility model, the catalyst is a supported catalyst with a particle size of 3-5 mm and a bulk density of 0.6-0.7 g / cm³. 3 Specific surface area ≥180m²2 / g, pore volume ≥0.3cm 3 / g, compressive strength ≥100N / particle, abrasion rate ≥0.6%.

[0076] According to this utility model, the ozone catalytic oxidation tower can be configured with different tower diameters, water and gas distribution parameters, catalyst loading amounts, and parallel or series process combinations, depending on the actual influent conditions.

[0077] According to this utility model, the working principle of the ozone catalytic oxidation tower is as follows:

[0078] The wastewater to be treated is pressurized by an upstream transfer pump and enters the water distribution assembly 2 from the inlet 102 at the bottom of the ozone catalytic oxidation tower. Water is evenly distributed through the water distribution assembly 2. Ozone enters the aeration assembly 3 from the air inlet 103 at the bottom of the tower. Microbubbles are evenly distributed through the aeration discs of the aeration assembly 3, allowing the ozone to fully dissolve in the wastewater and improving ozone utilization. The gas-water mixture rises and flows through the fixed-fill catalyst bed 5. Under the action of the catalyst, ozone generates a large number of hydroxyl radicals, which further oxidize the organic matter in the wastewater, decomposing the recalcitrant organic matter in the water and thus reducing COD. The gas-water mixture continues to undergo oxidation above the catalyst bed 5. The reacted wastewater flows through the overflow weir to the outlet 106 and is discharged from the tower by gravity. The exhaust gas is discharged from the tower through the exhaust port 108 at the top.

[0079] The present invention will be described in detail below through embodiments. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0080] Unless otherwise specified in the following examples and comparative examples, all conditions were performed under standard conditions or conditions recommended by the manufacturer. Reagents or instruments used, unless otherwise specified, are all commercially available products.

[0081] Example 1

[0082] The pretreatment process for wastewater from chemical industrial parks includes the following steps:

[0083] Wastewater from the chemical industrial park, after pretreatment to remove suspended solids (SS), enters the main stream through flow regulation measures. Figure 1 The ozone catalytic oxidation tower shown in the diagram catalytically oxidizes pollutants in wastewater with ozone, and the wastewater flows out from the outlet to the next treatment stage. The influent COD is 300 mg / L, and the effluent COD is 210 mg / L. The project has a treatment capacity of 6000 m³ / L. 3 / d, using a 3.6m diameter oxidation tower, with a catalyst loading ratio of 30%, the designed empty tower inlet water flow rate is 0.0017m / s, the empty tower inlet gas flow rate is 0.0015m / s, and the actual operating O / C ratio is within 2.5.

[0084] After the wastewater is pretreated by ozone catalytic oxidation, not only is some of the COD removed, but the biodegradability of the wastewater is also improved, which indirectly improves the treatment efficiency of subsequent biological treatment facilities.

[0085] Example 2

[0086] The method for advanced wastewater treatment in chemical industrial parks includes the following steps:

[0087] Wastewater from the chemical industrial park, after initial biological treatment and sedimentation to remove suspended solids (SS), enters the main stream through flow regulation measures. Figure 1 The ozone catalytic oxidation tower shown in the diagram catalytically oxidizes pollutants in wastewater with ozone, and the wastewater flows out from the outlet to the next treatment stage. The influent COD is around 100 mg / L, and the effluent COD is less than 50 mg / L. The project has a treatment capacity of 10,000 m³ / L. 3 / d, using a 4.2m diameter oxidation tower, with a catalyst loading ratio of 30%, the designed empty tower inlet water flow rate is 0.002m / s, the empty tower inlet gas flow rate is 0.001m / s, and the actual operating O / C ratio is within 2.5.

[0088] The treated effluent meets the Class A standard of the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2016). Currently, similar projects using countercurrent ozone catalytic oxidation tower technology operate with an O / C ratio above 3.5. Compared to these, this method improves ozone utilization and reduces process energy consumption while achieving the same treatment effect.

[0089] The ozone catalytic oxidation tower of this invention employs a gas-water co-flow pattern, improving ozone utilization and further enhancing wastewater COD removal efficiency. The beam-type gas jet support structure provides over 100% free cross-section. More importantly, due to the concave-convex geometry of the support plate, only a small portion of the openings are blocked by the packing material after installation, thus preserving a sufficiently large effective free cross-section. Furthermore, this support structure reduces its own weight while increasing its load-bearing capacity. The ozone catalytic oxidation tower is equipped with an overflow weir to ensure uniform discharge of wastewater from the tower, and a spray demister at the top of the tower ensures that no excessive foam is generated inside the tower when treating high-concentration wastewater.

[0090] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.

Claims

1. An ozone catalytic oxidation tower, characterized in that, The ozone catalytic oxidation tower includes a tower body (1) and functional components disposed within the tower body (1); the functional components, from bottom to top, include: Water distribution assembly (2) is used to distribute wastewater to be treated; An aeration component (3) is used to disperse ozone gas into microbubbles and to rise in parallel with the wastewater to be treated from the water distribution component (2); A catalyst support assembly is used for the catalytic oxidation of pollutants in wastewater to be treated; the catalyst support assembly includes, from bottom to top, a beam-shaped gas jet support structure (4), a lower packing layer (5a), a catalyst bed (5), an upper packing layer (5b), and a packing gland (6); Fluid control assembly (7) for directing the treated water out of the tower; Foam suppression component (8) is used to eliminate foam generated during the process.

2. The ozone catalytic oxidation tower according to claim 1, characterized in that, The tower body (1) is a cylindrical pressure vessel with elliptical heads at both the top and bottom.

3. The ozone catalytic oxidation tower according to claim 1, characterized in that, The water distribution component (2) adopts a perforated water distribution pipe type.

4. The ozone catalytic oxidation tower according to claim 1, characterized in that, The aeration component (3) adopts a uniformly distributed titanium flat aeration disc with an aeration hole diameter ≤10μm.

5. The ozone catalytic oxidation tower according to claim 1, characterized in that, The beam-shaped gas jet support structure (4) adopts a beam-shaped gas jet filler support plate, which is covered with long waist holes and has a camel hump shape.

6. The ozone catalytic oxidation tower according to claim 5, characterized in that, The free section ratio of the beam-shaped gas jet packing support plate is ≥100%, and it is fixed to the inner wall of the tower body (1) by a ring plate and steel profile.

7. The ozone catalytic oxidation tower according to claim 1, characterized in that, The lower filler layer (5a) consists of at least two layers of inert ceramic balls with different particle sizes, wherein the particle size of the lower inert ceramic balls is larger than that of the upper inert ceramic balls. The upper filler layer (5b) consists of at least two layers of inert ceramic balls with different particle sizes, wherein the particle size of the lower inert ceramic balls is smaller than that of the upper inert ceramic balls.

8. The ozone catalytic oxidation tower according to claim 1, characterized in that, The fluid control component (7) adopts a circular annular overflow weir or a circular rectangular overflow weir.

9. The ozone catalytic oxidation tower according to claim 1, characterized in that, The foam suppression component (8) adopts a spray defoaming device, and the spray defoaming device is equipped with at least one set of solid spiral nozzles.

10. The ozone catalytic oxidation tower according to claim 1, characterized in that, The bottom and top of the tower body (1) are respectively provided with a drain port (101) and an exhaust port (108); The tower body (1) is provided with a water inlet (102), an air inlet (103), a water outlet (106), and a spray nozzle (107); wherein, the water inlet (102) is connected to the water distribution component (2); the air inlet (103) is connected to the aeration component (3); the water outlet (106) is located on the lower side of the fluid control component (7); and the spray nozzle (107) is connected to the foam suppression component (8).

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