Ozone catalytic oxidation wastewater treatment device and method

Abstract

An ozone catalytic oxidation wastewater treatment device and method. The wastewater treatment device comprises a tower body and a treatment unit arranged in the tower body, a water inlet is arranged at the upper part of the tower body, a water outlet is arranged at the lower part of the tower body, and the treatment unit is located between the water inlet and the water outlet. The treatment unit comprises a float valve tray, wastewater enters the tower body from the water inlet and flows onto the float valve tray; an air inlet assembly is arranged below the float valve tray, ozone enters the tower body through the air inlet assembly and flows upward, and is dissolved in the wastewater on the float valve tray; and a catalytic tray is arranged below the air inlet assembly, the wastewater after the ozone is dissolved flows downward to the catalytic tray, and flows downward after catalysis and is discharged from the water outlet. The mass transfer effect in the treatment process can be enhanced, and the ozone utilization rate can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wastewater treatment, and particularly relates to an ozone catalytic oxidation wastewater treatment device and an ozone catalytic oxidation wastewater treatment method. BACKGROUND

[0002] Ozone catalytic oxidation technology is a commonly used treatment technology for removing organic matters in sewage.

[0003] Ozone catalytic oxidation mainly utilizes ozone dissolved in water to generate hydroxyl radicals with strong oxidizing ability under the action of a catalyst. Commonly used catalysts are generally non-homogeneous granular catalysts, which are easy to separate from liquid, do not cause secondary pollution, and are widely used in wastewater treatment.

[0004] The non-homogeneous ozone catalytic oxidation process includes four stages: ozone is dissolved in water and adsorbed to the surface of the catalyst; the catalyst activates ozone to generate free radicals; the catalyst surface adsorbs organic matters; and the organic matters are oxidized by the free radicals.

[0005] Non-homogeneous ozone catalytic oxidation involves gas-liquid-solid three-phase mass transfer. In the prior art, in order to enhance the mass transfer process and improve the ozone utilization rate, the methods adopted by related patents and technologies include setting a jet device, increasing the pressure in the tower, and combining multiple ozone catalytic oxidation towers.

[0006] However, these methods need to increase equipment (jet device, pressurized container, catalytic oxidation tower), which will inevitably increase the capital cost and the occupied area.

[0007] In addition, the existing ozone catalytic oxidation device has a low ozone utilization rate. During operation, most of the ozone is directly discharged without participating in the reaction, which leads to a large scale of ozone generator and high energy consumption. SUMMARY

[0008] In view of the above technical problems, the present application aims to provide a wastewater treatment device which can enhance the mass transfer effect among gas, solid and liquid in the treatment process, improve the wastewater treatment efficiency and ozone utilization rate.

[0009] The present application also provides a wastewater treatment method which can enhance the mass transfer effect in the treatment process, improve the wastewater treatment efficiency and ozone utilization rate.

[0010] According to the present application, a wastewater treatment device is provided, comprising a tower body and a treatment unit arranged in the tower body, a water inlet is arranged at the upper part of the tower body, a water outlet is arranged at the lower part of the tower body, and the treatment unit is located between the water inlet and the water outlet, wherein the treatment unit comprises a float valve tray, an air inlet assembly, and a catalytic tray, the float valve tray is located above the air inlet assembly, and the catalytic tray is located below the air inlet assembly. The wastewater enters the tower body from the water inlet and flows to the float valve tray; the ozone enters the tower body through the air inlet assembly and flows upward, dissolves in the wastewater on the float valve tray through the float valve tray; the wastewater after the ozone dissolves flows downward to the catalytic tray, and flows downward after catalysis and is discharged from the water outlet.

[0011] In the tower, the ozone flows upward, the valve body on the float valve tray is opened under the force of the ozone, and at the same time, the ozone flows horizontally under the action of the valve body, so as to be dissolved in the wastewater on the float valve tray. The ozone and the wastewater can have a large contact area, so as to accelerate the speed of the ozone dissolving in the wastewater.

[0012] In some embodiments, part of the peripheral wall of the float valve tray is sealingly connected or closely fitted with the tower wall of the tower body, and the other part of the peripheral wall has a first passage opening with the tower wall of the tower body; part of the peripheral wall of the catalytic tray is sealingly connected or closely fitted with the tower wall of the tower body, and the other part of the peripheral wall has a second passage opening with the peripheral wall of the tower body; the projection of the first passage opening and the second passage opening in the horizontal direction does not overlap each other.

[0013] In a preferred embodiment, the first passage opening and the second passage opening are arranged at the positions farthest away from each other in the horizontal direction. The gas-liquid mixture from the float valve tray flows downward to one side of the connecting tower wall of the catalytic tray, and then flows through the catalyst bed to the second passage opening of the catalytic tray. The preferred arrangement of the first and second gaps increases the flow path of the gas-liquid mixture on the catalytic tray.

[0014] In some embodiments, a plurality of treatment units are arranged in the tower body from top to bottom. The contact of the float valve tray of each treatment unit with the tower wall of the tower body overlaps in the projection of the horizontal plane, and the contact of the catalytic tray of each treatment unit with the tower wall of the tower body overlaps in the projection of the horizontal plane. In this way, the gas-liquid mixture flows through the float valve tray and the catalytic tray from top to bottom in the entire tower, forming a cross flow. The contact time and contact efficiency of the ozone, the wastewater, and the catalyst are increased, and thus the removal effect of the organic matter in the wastewater is significantly improved.

[0015] In order to further improve the mass transfer efficiency of the liquid-solid at the catalytic tray, the catalytic tray is arranged as follows.

[0016] The catalytic tray comprises a support plate for containing catalyst and a first baffle, one side of the first baffle being connected to the support plate, and the angle between the first baffle and the support plate being 0°<α≤90°. The angle between the first baffle and the support plate is 90° in the whole.

[0017] Preferably, the cross section of the first baffle is in a curved shape in the vertical direction of the tower.

[0018] The curved first baffles can be arranged in multiple numbers. The connection of the multiple first baffles to the support plate is substantially perpendicular to the overall flow direction of the waste liquid on the support plate. The waste liquid flows through the curved first baffles, and turbulence is generated in the interval cavities between adjacent first baffles. In the multiple turbulence zones, the liquid-solid mass transfer efficiency can be enhanced. In the turbulence zones, the catalyst particles are repeatedly turned and floated up and down under the action of the water flow in multiple directions, thereby increasing the solid-liquid contact area. Therefore, the liquid-solid reaction, i.e., the excitation of dissolved ozone and the degradation of organic matter in wastewater, is more sufficient.

[0019] In some embodiments, a second baffle is arranged between two first baffles, one side of the second baffle being connected to a frame beam above the support plate, and the opposite side having a gap with the support plate.

[0020] The second baffle is curved in the vertical direction of the tower, such as an S-shaped baffle.

[0021] The second baffle is substantially perpendicular to the overall flow direction of the waste liquid on the support plate.

[0022] The angle between the second baffle and the support plate is 0°<α≤90°. The angle between the second baffle and the support plate is 90° in the whole.

[0023] The catalytic tray provided with the first and second baffles has a greater frequency of the up-and-down floating of the catalyst particles under the action of the water flow in each turbulence zone, further increases the solid-liquid contact area, prolongs the residence time of the water flow on the support plate, and further increases the degradation effect of the organic matter in the wastewater.

[0024] The frame beam can be a frame structure or composed of multiple beams, and the frame beam is connected to the support plate through a support rod. The frame beam can also be other structures as long as it can fix the second baffle above the support plate.

[0025] In a preferred embodiment, a float valve overflow weir and a float valve downcomer are arranged at the end of the float valve tray away from the water inlet in the vertical direction.

[0026] The float valve overflow weir is arranged above the float valve tray and is used to limit the liquid level of the float valve tray.

[0027] In a preferred embodiment, a catalytic overflow weir and a catalytic downcomer are arranged on the support plate of the catalytic tray in the vertical direction away from the end of the float valve downcomer.

[0028] The catalytic overflow weir is arranged above the support plate and is used to limit the liquid level on the support plate.

[0029] The catalytic downcomer is arranged below the support plate and is used to guide the wastewater flowing downward.

[0030] The catalytic overflow weir of the catalytic tray is connected with the support plate, and the connection position is substantially perpendicular to the overall flow direction of the wastewater on the support plate.

[0031] In a preferred embodiment, the lowest point of the float valve downcomer is lower than the highest point of the catalytic overflow weir.

[0032] In a preferred embodiment, a liquid inlet baffle is arranged in the tower body, and a baffle strip is arranged on the upper end surface of the float valve tray, the baffle strip is located between the water inlet and the valve body of the float valve tray, and after the wastewater enters the tower body from the water inlet, it falls to the side of the baffle strip away from the valve body under the action of the liquid inlet baffle.

[0033] In a preferred embodiment, the air inlet assembly includes a gas distribution pipe. Specifically, the gas distribution pipe is a closed pipe with a plurality of air holes distributed on the pipe wall.

[0034] The air inlet assembly further includes a flange connected with the gas distribution pipe, and the gas distribution pipe is installed at the air inlet of the tower body through the flange.

[0035] In a preferred embodiment, a plurality of the treatment units are sequentially arranged in the tower body from top to bottom, and a plurality of maintenance openings are arranged on the sidewall of the tower body, and the maintenance openings correspond to the treatment units one by one.

[0036] In a preferred embodiment, at least three treatment units are sequentially arranged in the tower body from top to bottom, and an ozone collection opening is arranged on the top of the tower body, the ozone collection opening is connected with the air inlet assembly of the lowermost treatment unit, ozone flows out of the ozone collection opening and then enters the air inlet assembly of the lowermost treatment unit, and the air inlet assemblies of the remaining treatment units are connected with an ozone generator, which provides ozone for the remaining treatment units.

[0037] In the present application, a wastewater treatment method is also provided, wherein the wastewater is treated by using the wastewater treatment device provided in the present application, and the ozone is dissolved into the wastewater during the process of passing through the float valve tray of the treatment unit, and the wastewater with dissolved ozone is subjected to catalytic reaction on the catalytic tray of the treatment unit.

[0038] In a preferred embodiment, the ozone not dissolved into the wastewater is discharged from the ozone collection port at the top of the tower body, and then enters the tower body from the treatment unit located at the lowermost position, so as to complete the recycling of the ozone.

[0039] Compared with the prior art, the present application has the following advantages.

[0040] The float valve tray is used in the present application to promote the mass transfer of ozone and wastewater, and replace the traditional aeration. When the gas phase passes through the valve body on the float valve tray, the wastewater on the surface of the float valve tray is dispersed into droplets, the gas-liquid contact mass transfer area is increased, and the gas-liquid mass transfer rate is accelerated, so that more ozone is dissolved into the wastewater. Further, in combination with the improvement of the catalytic bed, the gas, liquid and solid three phases are fully contacted for reaction, and thus the utilization rate of ozone and the treatment efficiency of wastewater are improved.

[0041] In addition, the present application divides one treatment unit into three parts, i.e., upper, middle and lower parts, by using the combination of multiple layers of trays, and multiple treatment units are arranged in the vertical direction, so as to reduce the capital investment and land occupation.

[0042] In addition, the undissolved ozone in the present application enters the treatment unit again through the ozone collection port, so as to realize the recycling, replace the ozone destruction device in the prior art, and eliminate the need for the pressurized gas releasing device, so that the utilization efficiency of ozone is high. BRIEF DESCRIPTION OF DRAWINGS

[0043] The present application will be described below with reference to the accompanying drawings.

[0044] Figure 1 A schematic view of one embodiment of the wastewater treatment device according to the present application is shown;

[0045] Figure 2 A schematic view of one embodiment of the gas inlet assembly according to the present application is shown;

[0046] Figure 3 A top view structural schematic view of one embodiment of the float valve tray according to the present application is shown;

[0047] Figure 4 A schematic view of the working flow of one embodiment of the wastewater treatment device according to the present application is shown;

[0048] Figure 5 A schematic view of another embodiment of the wastewater treatment device according to the present application is shown;

[0049] Figure 6 A cross-sectional view of one embodiment of a catalytic tray of a wastewater treatment device is shown.

[0050] In the drawings:

[0051] 1, tower body; 11, water inlet; 12, water outlet; 13, liquid inlet baffle; 14, air inlet; 15, maintenance opening; 16, ozone collection opening;

[0052] 2, treatment unit;

[0053] 21, float valve tray; 211, float valve overflow weir; 212, float valve downcomer; 213, baffle; 214, valve body; 215, first passage opening;

[0054] 22, air inlet assembly; 221, air distribution pipe; 222, flange; 223, air hole;

[0055] 23, catalytic tray; 231, support plate; 232, catalyst layer; 233, catalytic overflow weir; 234, catalytic downcomer; 235, second passage opening;

[0056] 25, frame support beam;

[0057] 26, support rod;

[0058] 271, first baffle; 272, second baffle;

[0059] 3, ozone generator; 31, ozone flow controller;

[0060] 4, wastewater tank; 41, centrifugal pump;

[0061] 5, fan;

[0062] 100, wastewater treatment device.

[0063] In this application, all the drawings are schematic drawings, which are only used to illustrate the principles of the application, and are not drawn according to the actual proportions. DETAILED DESCRIPTION

[0064] The application will be described below with reference to the drawings.

[0065] It should be noted that the directional phrases or limiting words "up", "down", "front", "back", "left", "right" and the like used in this application are all with reference to the Figure 1 They are not used to limit the absolute position of the parts involved, but can be changed according to the specific situation.

[0066] The wastewater treatment device of the present application mainly utilizes ozone to oxidize the COD (full name "Chemical Oxygen Demand") of wastewater. The COD refers to the amount of oxidizing agent consumed when a certain strong oxidizing agent is used to treat water samples under certain conditions. The reducing substances in water are mainly organic matter, so generally COD is used to represent the total amount of organic matter in wastewater.

[0067] Figure 1 The structure of the wastewater treatment device 100 according to the present application is shown. As shown in Figure 1 , the wastewater treatment device 100 includes a tower body 1 and a treatment unit 2.

[0068] In this embodiment, the tower body 1 is provided in a cylindrical barrel type, and the upper and lower ends of the tower body 1 are provided in a spherical shape. Other shapes of the tower body can be used for prior art.

[0069] A water inlet 11 is provided at the upper part of the tower body 1, and a water outlet 12 is provided at the lower part of the tower body 1. Specifically, the water inlet 11 is provided at the top end of the cylindrical side surface of the tower body 1, and the water outlet 12 is provided at the bottom end of the cylindrical side surface of the tower body 1.

[0070] The treatment unit 2 is provided inside the tower body 1, and the treatment unit 2 is located between the water inlet 11 and the water outlet 12.

[0071] The treatment unit 2 includes a float valve tray 21, an air inlet assembly 22, and a catalytic tray 23. The float valve tray 21 is provided below the water inlet 11, the air inlet assembly 22 is provided below the float valve tray 21, and the catalytic tray 23 is provided below the air inlet assembly 22.

[0072] Under this arrangement, wastewater enters the tower body 1 from the water inlet 11 and flows onto the float valve tray 21, while ozone enters the tower body 1 through the air inlet assembly 22 and flows upward, dissolves in the wastewater on the float valve tray 21 through the float valve tray 21, and then the wastewater dissolved with ozone flows downward onto the catalytic tray 23, and after catalysis, it flows downward and is discharged from the water outlet 12.

[0073] In a preferred embodiment, a liquid inlet baffle 13 is provided in the tower body 1. Specifically, as shown in Figure 1 , the cross section of the liquid inlet baffle 13 is provided in an L shape, and the liquid inlet baffle 13 is located at the position of the water inlet 11, for limiting the distance of the wastewater sprayed in the horizontal direction after entering from the water inlet 11.

[0074] At the same time, a baffle 213 is provided at the upper end surface of the float valve tray 21, the baffle 213 is located between the water inlet 11 and the valve body 214 of the float valve tray 21, and further, the baffle 213 is located between the liquid inlet baffle 13 and the valve body 214.

[0075] In this arrangement, the wastewater enters the tower body 1 from the water inlet 11 and falls onto the float valve tray 21 on the side of the baffle 213 away from the valve body 214 under the action of the liquid inlet baffle 13. When the height of the wastewater exceeds the baffle 213, the wastewater can flow to the side of the float valve tray 21 provided with the valve body 214 by passing over the baffle 213.

[0076] After the liquid inlet baffle 13 and the baffle 213 are arranged, the area on the left side of the baffle 213 can act as a buffer, so that the wastewater can be more evenly distributed in the area of the float valve tray 21 provided with the valve body 214, and thus the ozone can be better dissolved in the wastewater. In a specific embodiment, the gas inlet assembly 22 includes a gas distribution pipe 221 and a flange 222, as shown in Figure 2 .

[0077] In combination with Figure 1 and Figure 2 shown, the tower body 1 is provided with a gas inlet 14, and the flange 222 is arranged at the end of the gas distribution pipe 221, and the gas distribution pipe 221 is installed at the gas inlet 14 through the flange 222, so that the ozone can pass through the gas inlet 14, the flange 222 and the gas distribution pipe 221 in sequence, and finally enter the tower body 1.

[0078] After the ozone enters the tower body 1, it moves upward and passes through the float valve tray 21, and the valve body 214 on the float valve tray 21 is opened under the action of the ozone force, at the same time, the ozone flows horizontally under the action of the valve body 214, so as to be dissolved with the wastewater on the float valve tray 21. In this arrangement, the ozone and the wastewater can have a large contact area, thereby accelerating the speed of ozone dissolving in the wastewater.

[0079] It is easy to understand that the structure of the float valve tray 21 is prior art, and will not be described here.

[0080] In a preferred embodiment, the gas distribution pipe 221 is provided in a cylindrical barrel type with one end blocked. Specifically, as shown in Figure 2 the right end of the gas distribution pipe 221 is closed, the left end is open, and the left end opening of the gas distribution pipe 221 is fixedly connected with the flange 222. A plurality of gas holes 223 are uniformly distributed on the cylindrical surface of the gas distribution pipe 221, and the ozone enters the tower body 1 through the plurality of gas holes 223, thereby ensuring uniform distribution of ozone on the entire cross section of the float valve tray 21.

[0081] In a preferred embodiment, in combination with Figure 1 and Figure 3As shown, the float valve tray 21 is a broken circle, and the broken part of the float valve tray 21 is located at the end far from the water inlet 11, and the broken part of the float valve tray 21 is set as the first passage opening 215. The float valve overflow weir 211 and the float valve downcomer 212 are arranged along the vertical direction at the end of the float valve tray 21 far from the water inlet 11, that is, the first passage opening 215 is located between the float valve overflow weir 211 and the tower body 1, and between the float valve downcomer 212 and the tower body 1.

[0082] The float valve overflow weir 211 is arranged above the float valve tray 21, and is used to limit the liquid level of the float valve tray 21.

[0083] The float valve downcomer 212 is arranged below the float valve tray 21, and is used to guide the wastewater flowing downward.

[0084] After the wastewater flows onto the float valve tray 21, under the action of the float valve overflow weir 211, the wastewater accumulates on the float valve tray 21 until the height of the wastewater is level with the height of the float valve overflow weir 211, and then the wastewater continues to flow from the water inlet 11 to the float valve tray 21, and then flows over the float valve overflow weir 211 to the first passage opening 215 and flows downward, and finally flows downward to the catalytic tray 23 under the guiding action of the float valve downcomer 212, and performs ozone catalytic oxidation on the catalytic tray 23.

[0085] In a specific embodiment, the catalytic tray 23 comprises a support plate 231 and a catalyst layer 232 arranged on the support plate 231.

[0086] Specifically, the support plate 231 is also arranged as a broken circle, and the broken part of the support plate 231 is arranged as the second passage opening 235, and different from the float valve tray 21, the broken part of the support plate 231 is arranged close to the water inlet 11, that is, the second passage opening 235 is arranged on the side of the support plate 231 close to the water inlet 11.

[0087] Under this arrangement, the wastewater left on the float valve tray 21 will flow to the right upper part of the support plate 231, and then flow from right to left, so as to fully contact the catalyst layer 232 on the support plate.

[0088] The catalytic overflow weir 233 arranged along the vertical direction and the catalytic downcomer 234 are fixed at the left end of the support plate 231, that is, the right end of the second passage opening 235, the catalytic overflow weir 233 is arranged above the support plate 231, and is used to limit the liquid level on the support plate 231, and at the same time provides the wastewater dissolved with ozone with sufficient contact time with the catalyst layer 232. The catalytic downcomer 234 is arranged below the support plate 231, and is used to guide the wastewater flowing downward.

[0089] When the wastewater liquid level on the support plate 231 exceeds the height of the catalytic overflow weir 233, the wastewater flows over the catalytic overflow weir 233, and under the guidance of the catalytic downcomer plate 234, flows downward through the second passage 235.

[0090] In a preferred embodiment, the lowest point of the float valve downcomer plate 212 is lower than the highest point of the catalytic overflow weir 233. When the wastewater containing ozone falls on the support plate 231 and the height of the wastewater is level with the height of the catalytic overflow weir 233, the lower end of the float valve downcomer plate 212 is immersed in the wastewater. Under the action of the float valve downcomer plate 212, the wastewater can flow from low to high through the catalyst layer 232, and fully contact the catalyst layer 232, thereby accelerating the reaction rate.

[0091] In a specific embodiment, the catalyst layer 232 is a stack of granular catalysts. On the basis that the lowest point of the float valve downcomer plate 212 is lower than the highest point of the catalytic overflow weir 233, the distance from the lowest point of the float valve downcomer plate 212 to the support plate 231 is not less than the size of a catalyst particle in the catalyst layer 232, thereby ensuring flowability.

[0092] In a preferred embodiment according to the present application, a plurality of treatment units 2 are sequentially arranged in the tower body 1 from top to bottom. The structure of each treatment unit 2 can refer to the structure of the treatment unit 2 in the above-mentioned embodiments. In this arrangement, the plurality of treatment units 2 cooperate with each other to repeatedly perform ozone catalytic oxidation on the wastewater, thereby improving the effect of wastewater treatment.

[0093] When the plurality of treatment units 2 cooperate with each other, the catalytic downcomer plate 234 of the upper-stage treatment unit 2 functions as the liquid inlet baffle 13 at the water inlet 11 for the lower-stage treatment unit 2. That is, the catalytic downcomer plate 234 of the upper-stage treatment unit is located on the side of the baffle strip 213 of the lower-stage treatment unit 2 away from the valve body 214.

[0094] At the same time, a plurality of maintenance openings 15 are arranged on the cylindrical side wall of the tower body 1, and the number and position of the maintenance openings 15 correspond to the treatment units 2 one by one. In the present embodiment, the maintenance openings 15 are arranged on the side of the tower body 1 away from the water inlet 11, as shown in Figure 1 That is, the water inlet 11 is arranged on the leftmost side of the tower body 1, and each maintenance opening 15 is arranged on the rightmost side of the tower body 1.

[0095] Further, at least three treatment units 2 are sequentially arranged in the tower body 1 from top to bottom. In the present embodiment, three treatment units 2 are arranged. Figure 1 and Figure 4 As shown in the drawings, an ozone collection opening 16 is arranged at the top of the tower body 1, and the ozone collection opening 16 is connected to the air inlet assembly 22 of the lowermost treatment unit 2, and the air inlet assemblies 22 of the remaining treatment units 2 are connected to the ozone generator 3.

[0096] In this setup, ozone that has not dissolved in the wastewater can enter the lowest treatment unit 2 through the ozone collection port 16, and continuously mix with the wastewater as it flows upward along the tower body 1, thereby improving the utilization rate of ozone.

[0097] Furthermore, such as Figure 4 As shown, a fan 5 is installed between the ozone collection port 16 and the lowest treatment unit 2. During operation, the fan 5 can transport ozone that has not dissolved in the wastewater to the lowest treatment unit 2.

[0098] Furthermore, an ozone flow controller 31 is provided between the ozone generator 3 and the two processing units 2 above it. The ozone flow controller 31 can control the flow rate of ozone entering the two processing units 2 respectively.

[0099] Furthermore, this embodiment also includes a wastewater tank 4 for holding wastewater, and a centrifugal pump 41 is installed between the wastewater tank 4 and the inlet 11. During operation, the centrifugal pump 41 can transport the wastewater in the wastewater tank 4 to the tower body 1.

[0100] This application also provides another embodiment. In this embodiment, the wastewater treatment device 100 is the same as the above embodiment except that the arrangement of the catalytic tower plate 23 is different. The specific structure is as follows.

[0101] refer to Figure 5 and Figure 6 The catalytic tray 23 includes a support plate 231 and a first baffle plate 271. The first baffle plate is a thin plate with curved surfaces on both sides. For example, as shown in the attached diagram... Figure 6 As shown, the cross-section is S-shaped.

[0102] The first baffle plate 271 presents a straight side ( Figure 6 The lower end of the first baffle plate 271 is connected to the support plate 231, and the angle formed by the connection positions of the first baffle plate 271 and the support plate 231 is 0° < α ≤ 90°. Specifically, see attached... Figure 5 and Figure 6 As shown, the angle formed by the first baffle plate 271 and the support plate 231 is perpendicular to each other at 90°. Since the first baffle plate 271 is curved in the vertical direction of the tower body 1, such as a baffle plate with an S-shaped cross-section, its overall structural outline is at an angle greater than 90° with the support plate.

[0103] The first baffle plates 271 are arranged in a plurality of numbers. The plurality of first baffle plates 271 are arranged in sequence along the direction of fluid flow on the support plate 231 and are fixedly arranged on the upper end surface of the support plate 231. The overall plate surface of each first baffle plate 271 is substantially perpendicular to the overall direction of flow of the waste liquid on the support plate 231.

[0104] The length of the side of each first baffle plate 271 connected to the support plate 231 is the same as the length of the support plate 231 at the corresponding position. For example, in order to contact the peripheral wall of the tower body 1, the width of the support plate 231 perpendicular to the direction of water flow can be varied, and therefore the length of the first baffle plate 271 needs to be adjusted accordingly.

[0105] In a preferred embodiment, a second baffle plate 272 is arranged between any two adjacent first baffle plates 271. The plurality of second baffle plates 272 are arranged in sequence along the direction of flow of the waste liquid on the support plate 231 and are fixedly arranged on the lower end surface of the frame support beam 25.

[0106] The second baffle plate 272 has the same shape as the first baffle plate 271.

[0107] One side of the second baffle plate 272 (the upper end of the second baffle plate 272) is connected to the frame support beam 25 above the support plate 231, and the opposite side (the lower end of the second baffle plate 272) has a gap with the support plate 231. Figure 6 Figure 6 In the vertical direction within the tower body 1, the cross section of the second baffle plate 272 is in a curved shape. For example, the cross section is an S-shaped baffle plate.

[0108] The overall plate surface of the second baffle plate 272 is substantially perpendicular to the overall direction of flow of the waste liquid on the support plate 231.

[0109] The angle between the second baffle plate 272 and the support plate 231 is 0° < a ≤ 90°. The angle between the second baffle plate 272 and the support plate 231 is substantially 90°.

[0110] The angle between the second baffle plate 272 and the support plate 231 is 0° < a ≤ 90°. The angle between the second baffle plate 272 and the support plate 231 is substantially 90°.

[0111] The frame support beam 25 can be a frame structure or composed of a plurality of beams, and the frame support beam 25 is connected to the support plate 231 by one or a plurality of support rods 26 arranged at intervals. The frame support beam 25 can also have other structures as long as it can fix the second baffle plate 271 above the support plate 231 and is used to mount the second baffle plate 272.

[0112] Preferably, the side of the first baffle plate 271 away from the support plate 231 is lower than the frame support beam 25, i.e. lower than the uppermost side of the second baffle plate 272, and there is a gap between the upper end of the first baffle plate 271 and the frame support beam 25.

[0113] ​The wastewater flows into the float valve tray 21 through the water inlet 11, flows along a first direction to the float valve downcomer 212, and is mixed with the ozone entering through the air distribution pipe 221; the gas-liquid mixture flows along the float valve downcomer 212 to the catalytic tray 23, and flows along a second direction to the catalytic downcomer 234 of the catalytic tray 23, wherein the first flow direction is opposite to the second flow direction. In the catalytic tray 23, the gas-liquid mixture enters a plurality of spaced areas formed by the first baffle 271 or the first baffle 271 and the second baffle 272, and different degrees of turbulent flow phenomena are formed in the plurality of spaced areas, the catalyst particles move in multiple directions in the turbulent flow areas, the contact area and the contact time with the gas-liquid mixture are increased, and the removal efficiency of the organic matter in the wastewater is improved.

[0114] More preferably, the vertical cross section of the first baffle 271 and the second baffle 272 includes at least two arc lines, and the openings of adjacent arc lines are oppositely arranged. For example, as shown in the accompanying drawings, the cross section of the first baffle 271 and the second baffle 272 includes a first arc line and a second arc line, the first arc line and the second arc line are smoothly connected, and the overall cross section is S-shaped. Figure 6

[0115] Specifically, the curvatures of the first arc line and the second arc line of the first baffle 271 and the second baffle 272 gradually increase from the end portion to the middle portion.

[0116] In order to make the mixed water flow smoothly through the catalyst layer 232 and promote the reaction of the gas, liquid and solid three phases, the opening directions of the first arc line and the second arc line of each first baffle 271 and second baffle 272 are consistent.

[0117] When the water flow flows through the support plate 231 of the catalytic tray, under the action of different curved surfaces of the first baffle 271 and the second baffle 272, the water flow flows along the tangent directions of the first baffle 271 and the second baffle 272 in different directions, disturbs the turnover of the catalyst particles, and further promotes the multi-dimensional contact of the catalyst particles with the wastewater and the ozone.

[0118] ​Further, in the horizontal direction, the lowermost end of the second baffle 272 is located substantially at the middle of the second arc of the first baffle 271; the uppermost end of the first baffle 271 is located substantially at the middle of the first arc of the second baffle 272. The middle of the first arc of the first baffle 271 is flush with the middle of the second arc of the second baffle 272. The first baffle 271 and the second baffle 272 cause the fluid to form uneven longitudinal flow rate in the lateral cross section in each interval of the catalytic tray 23, and to agitate the catalyst particles in the catalyst layer 232. Since the catalyst can be agitated to flip up and down, the contact area between the catalyst particles and the ozone diffused into the catalytic tray 23 is increased, and the ozone, the wastewater and the catalyst particles are further brought into full contact to react, so that the utilization rate of the ozone and the removal efficiency of the organic matter in the wastewater are improved.

[0119] In another embodiment, the cross section of the first baffle 271 and the second baffle 272 in the vertical direction is linear, and the angle formed with the support plate is greater than 0° and less than 90°. The inclination directions of the first baffle 271 and the second baffle 272 are opposite.

[0120] The wastewater treatment process using the wastewater treatment device described above includes that, in the treatment unit 2, the wastewater and the ozone are in cross flow, the ozone passes through the float valve tray 21 from bottom to top and enters the wastewater, and the wastewater flows into the catalytic tray 23 through the float valve downcomer 212, and under the action of the catalyst layer 232, the dissolved ozone is excited to generate free radicals, which plays a role in degrading the organic matter.

[0121] Specifically, the wastewater flows from the wastewater tank 4 to the tower body 1 under the action of the centrifugal pump 41, and after the wastewater enters the tower body 1 from the water inlet 11, it falls onto the float valve tray 21 of the uppermost treatment unit 2, and falls to the area on the left side of the baffle 213 under the action of the liquid inlet baffle 13.

[0122] After the liquid level exceeds the baffle 213, it flows into the float valve area, i.e. the area of the float valve tray 21 provided with the valve body 214. At the same time, the ozone enters the tower body 1 from the gas inlet 14 through the gas distribution pipe 221. The ozone sprayed from the gas distribution pipe 221 passes through the valve body 214 on the float valve tray 21, and the size of the ozone flow rate can be adjusted by adjusting the size of the opening and closing of the valve body 214. After the ozone passes through the valve body 214, it is mass transferred with the wastewater on the float valve tray 21, and the undissolved ozone rises to the ozone collection port 16. The wastewater with dissolved ozone slowly flows through the float valve overflow weir 211 and flows into the catalytic tray 23 through the float valve downcomer 212. After the wastewater with dissolved ozone enters the catalytic tray 23, under the action of the catalyst layer 232, the ozone is excited to generate free radicals, which reacts with the organic matter in the wastewater to achieve the effect of removing the organic matter.

[0123] The ozone flow rate of the top and middle treatment units 2 is controlled by the ozone flow controller 31. The ozone flow rate of each treatment unit 2 is determined based on the initial concentration of the wastewater received by each treatment unit 2 and the size of the droplets formed on the floating valve tray 21, and is generally controlled between 5-20 m / s.

[0124] Finally, the wastewater is treated by three treatment units 2 and then discharged from the outlet 12.

[0125] Undissolved ozone rises to ozone collection port 16, and after being collected, it returns to tower body 1 through air intake assembly 22 of the lowest treatment unit 2 under the action of fan 5, and continues to participate in the ozone catalytic oxidation reaction process.

[0126] Experimental Example 1:

[0127] In the existing ozone catalytic oxidation tower, ozone is emitted at a flow rate of 5 m³ / h. 3 The gas enters the tower body through the bottom gas distribution pipe at a flow rate of 1 m³ / h, directly contacting and dissolving in the wastewater inside the tower. 3 / h. The internal structure of the ozone catalytic oxidation tower is as follows: at the bottom of the tower, there is a catalyst mesh support layer, and a catalyst layer of about 1m in height (the catalyst is purchased from Shandong Longantai Environmental Protection Technology Co., Ltd. for ozone degradation of COD in wastewater). The water depth is 3m. The ozone is not recycled. Excess ozone is discharged and destroyed by an ozone destroyer.

[0128] The results showed that the ozone mixing efficiency was approximately 40% [the ozone mixing efficiency is the ratio of (inlet ozone concentration - outlet ozone concentration) / inlet ozone concentration]. Under the action of the catalyst, the wastewater (initial COD concentration of 500 mg / L) was treated, and the COD removal rate of the wastewater at the outlet was approximately 50%.

[0129] Experimental Example 2:

[0130] The difference between Experimental Example 2 and Experimental Example 1 is that Experimental Example 2 uses the appendix to this application. Figure 1 The wastewater treatment device 100 shown does not have baffles on the catalytic tray 23. Other process conditions are the same as in Experimental Example 1.

[0131] Ozone at a flow rate of 5m 3 The gas enters the tower body 1 through the gas distribution pipe 221, and comes into contact with the wastewater through the floating valve tray 21, dissolving in the wastewater. The flow rate of the wastewater is 1 m³ / h. 3 / h. The mixture of wastewater and ozone flows through the floating valve overflow weir 211 and then through the floating valve downcomer 212 into the catalytic tower plate 23. The catalytic tower plate 23 does not have baffles; only ozone granular catalyst is evenly distributed. After the wastewater (initial COD concentration of 500 mg / L) is treated through the three layers of catalytic tower plates 23, the COD removal rate of the wastewater is approximately 66%.

[0132] Experimental Example Three

[0133] The difference between Experimental Example Three and Experimental Example Two is that the wastewater treatment device 100 shown in the present application is used Figure 5 The other process conditions refer to Experimental Example One.

[0134] Ozone enters the tower body 1 through the gas distribution pipe 221 at a flow rate of 5 m 3 / h, contacts the wastewater through the float valve tray 21, dissolves in the wastewater, and the flow rate of the wastewater is 1 m 3 / h. The mixed fluid of the wastewater and ozone flows through the float valve overflow weir 211, enters the catalytic tray 23 through the float valve downcomer 212. The catalytic tray 23 is provided with the first baffle 271 and the second baffle 272, and after the wastewater (with an initial COD concentration of 500 mg / L) flows through the three layers of catalytic trays 23, the COD removal rate of the wastewater is about 73%.

[0135] Experimental Example Four

[0136] The difference between Experimental Example Four and Experimental Example Three is that the wastewater treatment device 100 shown in the present application is used Figure 1 The wastewater is changed to pure water, and the catalytic tray 23 is not provided with baffles. The other process conditions refer to Experimental Example One.

[0137] Ozone enters the tower body 1 through the gas distribution pipe 221 at a flow rate of 5 m 3 / h, contacts the pure water through the float valve tray 21, dissolves in the water, and the flow rate of the pure water is 1 m 3 / h. The mixed fluid of the pure water and ozone flows through the float valve overflow weir 211, enters the catalytic tray 23 through the float valve downcomer 212, and the ozone mixing efficiency can be improved to 60%.

[0138] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0139] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0140] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0141] Finally, it should be noted that the above only describes the preferred embodiments of the present application and does not constitute any limitation on the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A wastewater treatment device, comprising a tower body and a treatment unit arranged in the tower body, a water inlet arranged at an upper portion of the tower body, and a water outlet arranged at a lower portion of the tower body, a plurality of the treatment units arranged in the tower body in sequence from top to bottom, the plurality of the treatment units being located between the water inlet and the water outlet, the treatment unit comprising a float valve tray, a gas inlet assembly, and a catalytic tray, the float valve tray being located above the gas inlet assembly, and the catalytic tray being located below the gas inlet assembly, the catalytic tray comprising a plurality of first baffle plates, second baffle plates, a support plate, and a catalyst layer arranged on the support plate, the catalyst layer being formed by stacking of granular catalysts, a float valve overflow weir and a float valve downcomer being arranged at an end of the float valve tray away from the water inlet in a vertical direction, a catalytic overflow weir and a catalytic downcomer being arranged at an end of the support plate away from the float valve downcomer in the vertical direction, the catalytic overflow weir being arranged above the support plate, and the catalytic downcomer being arranged below the support plate, one side edge of each of the first baffle plates being connected to the support plate, one side edge of each of the second baffle plates being connected to a frame beam above the support plate, and a second baffle plate being arranged between two first baffle plates, in the vertical direction of the tower, a cross section of each of the first baffle plates and a cross section of each of the second baffle plates being in a curved shape, and a surface of each of the first baffle plates and the second baffle plates being substantially perpendicular to a whole flow direction of wastewater on the support plate, a gap being formed between an upper end of each of the first baffle plates and the frame beam, and a gap being formed between a lower end of each of the second baffle plates and the support plate, a part of a peripheral wall of the float valve tray being sealingly connected to or abuttingly fitted to a tower wall of the tower body, and another part of the peripheral wall having a first passage opening to the tower wall of the tower body; a part of a peripheral wall of the catalytic tray being sealingly connected to or abuttingly fitted to the tower wall of the tower body, and another part of the peripheral wall having a second passage opening to the tower wall of the tower body; a projection of the first passage opening and the second passage opening in a horizontal direction not overlapping each other. The first passage opening and the second passage opening are arranged at a position where a projection of the first passage opening and the second passage opening in the horizontal direction is farthest apart. wherein A projection of a contact between the float valve tray of each of the treatment units and the tower wall of the tower body in a horizontal plane overlaps, and a projection of a contact between the catalytic tray of each of the treatment units and the tower wall of the tower body in a horizontal plane overlaps. A cross section of each of the first baffle plates and the second baffle plates in the vertical direction comprises at least two arc lines, and openings of adjacent arc lines are oppositely arranged. Curvatures of the first arc line and the second arc line of each of the first baffle plates and the second baffle plates gradually increase from an end portion to a middle portion. Directions of the openings of the first arc line and the second arc line of each of the first baffle plates and the second baffle plates on the support plate of the catalytic tray are consistent. In the horizontal direction, a lowermost end portion of the second baffle plate is located at a middle portion of the second arc line of the first baffle plate, and an uppermost end portion of the first baffle plate is located at a middle portion of the first arc line of the second baffle plate. A middle portion of the first arc line of the first baffle plate is flush with a middle point of the second arc line of the second baffle plate.

2. The wastewater treatment device according to claim 1, characterized by A lowest point of the float valve downcomer is lower than a highest point of the catalytic overflow weir.

3. The wastewater treatment device according to claim 2, characterized by ​ 4. The wastewater treatment device according to claim 1, characterized by ​ 5. The wastewater treatment device of claim 1, wherein ​ 6. The wastewater treatment device of claim 5, wherein ​ 7. The wastewater treatment device of claim 6, wherein ​ 8. The wastewater treatment device according to claim 6 or 7, characterized in that ​ 9. The wastewater treatment device of claim 8, wherein, ​ 10. The wastewater treatment device according to any one of claims 1 to 6, characterized in that, ​ 11. The wastewater treatment device according to any one of claims 1 to 6, characterized in that, The air inlet assembly comprises a gas distribution pipe which is a pipe with one end closed, and a plurality of air holes are distributed on the pipe wall of the gas distribution pipe.

12. The wastewater treatment device of claim 11, wherein, The air inlet assembly further comprises a flange connected with the gas distribution pipe, and the gas distribution pipe is installed at the air inlet of the tower body through the flange.

13. The wastewater treatment device of any one of claims 1-6, wherein, At least three treatment units are sequentially arranged from top to bottom in the tower body, and an ozone collection port is arranged at the top of the tower body and connected with the air inlet assembly of the lowermost treatment unit.

14. A method of wastewater treatment, characterized by, The wastewater treatment device according to any one of claims 1-6 is used to treat wastewater, ozone is dissolved into the wastewater during the process of passing through the float valve tray of the treatment unit, and the wastewater with dissolved ozone is subjected to catalytic reaction on the catalytic tray of the treatment unit.

15. The wastewater treatment method according to claim 14, characterized by, The ozone not dissolved into the wastewater flows out from the ozone collection port at the top of the tower body, enters the tower body from the lowermost treatment unit, and is recycled.

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