Catalytic ozonation combined tower device

Abstract

The utility model discloses an ozone catalytic oxidation combined tower device, which relates to the technical field of wastewater treatment and comprises a first oxidation tower, a second oxidation tower, a circulating pump and an air blower, a first ozone outlet of the first oxidation tower is communicated with a second ozone inlet of the second oxidation tower through a gas phase pipe, and the air blower is arranged on the gas phase pipe; the bottom of the second oxidation tower is communicated with the bottom of the first oxidation tower through a liquid phase balance pipe; a first wastewater outlet of the first oxidation tower is connected with a wastewater discharge pipe, the circulating pump is arranged on the wastewater discharge pipe, a liquid-phase circulating pipe is connected to a position, behind the circulating pump, on the wastewater discharge pipe, and one end, far away from the wastewater discharge pipe, of the liquid-phase circulating pipe is communicated with a first wastewater inlet of the first oxidation tower; a first filler is arranged in the first oxidation tower, and a second filler is arranged in the second oxidation tower, so that ozone introduced into the first oxidation tower performs catalytic oxidation treatment on wastewater introduced into the second oxidation tower, the gas-liquid contact effect is enhanced, and the ozone utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an ozone catalytic oxidation combined tower device. Background Technique

[0002] In the application of water treatment engineering, with the improvement of wastewater discharge standards, advanced oxidation treatment technologies have gradually entered the mainstream water treatment process. Advanced oxidation mainly includes Fenton oxidation, ozone catalytic oxidation, electro-catalytic oxidation, etc. Among them, ozone catalytic oxidation has attracted more and more attention from technicians due to its strong oxidation ability, no secondary pollution such as solid waste, etc.

[0003] Ozone catalytic oxidation is a complex gas-liquid-solid three-phase mass transfer and reaction process. The adsorption of the catalyst, the solubility of ozone in wastewater, the oxidation reaction performance, the contact time and contact area of each item are important factors affecting the ozone utilization efficiency and oxidation effect.

[0004] However, when the existing ozone catalytic oxidation tower treats multi-component high-concentration organic wastewater, it often faces the problems of low ozone utilization rate, limited treatment efficiency and high energy consumption. Especially when treating wastewater containing substances that are difficult to biodegradable, single ozone catalytic oxidation often cannot achieve the ideal purification effect, and it is easy to cause rapid ozone consumption, low utilization rate, and increased operating costs.

[0005] Therefore, developing a wastewater treatment device with high ozone utilization rate and high oxidation efficiency is one of the main research directions of the current oxidation process. Content of the Utility Model

[0006] The purpose of the utility model is to provide an ozone catalytic oxidation combined tower device to solve the problems existing in the above-mentioned prior art. By connecting two oxidation towers in series, the gas-liquid contact effect is strengthened, the ozone utilization rate is improved, and the deep purification of wastewater is realized.

[0007] To achieve the above purpose, the utility model provides the following scheme:

[0008] The utility model provides an ozone catalytic oxidation combined tower device, which includes a first oxidation tower, a second oxidation tower, a circulation pump and a blower. Among them, a first ozone inlet and a first wastewater outlet are arranged at the lower part of the first oxidation tower, and a first wastewater inlet and a first ozone outlet are arranged at the upper part of the first oxidation tower; a second ozone inlet is arranged at the lower part of the second oxidation tower, and a second wastewater inlet and a second ozone outlet are arranged at the upper part of the second oxidation tower;

[0009] The first ozone inlet of the first oxidation tower is used to introduce ozone, and the first ozone outlet of the first oxidation tower is connected to the second ozone inlet of the second oxidation tower through a gas phase pipe, and the blower is arranged on the gas phase pipe; the second wastewater inlet of the second oxidation tower is used to introduce wastewater, and the bottom of the second oxidation tower is connected to the bottom of the first oxidation tower through a liquid phase balance pipe; a wastewater discharge pipe is connected to the first wastewater outlet of the first oxidation tower, the circulation pump is arranged on the wastewater discharge pipe, and a liquid phase circulation pipe is connected to the position behind the pump of the circulation pump on the wastewater discharge pipe, and one end of the liquid phase circulation pipe away from the wastewater discharge pipe is connected to the first wastewater inlet of the first oxidation tower;

[0010] The first oxidation tower is provided with a first packing, and the second oxidation tower is provided with a second packing, so that the ozone introduced into the first oxidation tower catalytically oxidizes the wastewater introduced into the second oxidation tower.

[0011] Preferably, a first aeration head is arranged at a position close to the first ozone inlet in the first oxidation tower, and the first ozone inlet is communicated with the first aeration head.

[0012] Preferably, a first spray head is arranged at a position close to the first wastewater inlet in the first oxidation tower, and the first wastewater inlet is communicated with the first spray head.

[0013] Preferably, the first packing includes a first ozone catalyst packing and a first gas-liquid contact packing, the first ozone catalyst packing is arranged at the lower part of the first oxidation tower and above the first aeration head; the first gas-liquid contact packing is arranged at the upper part of the first oxidation tower and below the first spray head.

[0014] Preferably, the first ozone catalyst packing is an iron-manganese multi-metal oxide packing; the first gas-liquid contact packing is a Pall ring packing.

[0015] Preferably, a second aeration head is arranged at a position close to the second ozone inlet in the second oxidation tower, and the second ozone inlet is communicated with the second aeration head.

[0016] Preferably, a second spray head is arranged at a position close to the second wastewater inlet in the second oxidation tower, and the second wastewater inlet is communicated with the second spray head.

[0017] Preferably, the second packing includes a second ozone catalyst packing and a second gas-liquid contact packing, the second ozone catalyst packing is arranged at the lower part of the second oxidation tower and above the second aeration head; the second gas-liquid contact packing is arranged at the upper part of the second oxidation tower and below the second spray head.

[0018] Preferably, the second ozone catalyst packing is copper-cerium metal oxide packing; the second gas-liquid contact packing is corrugated wire mesh packing.

[0019] Preferably, a liquid level transmitter is provided on both the first oxidation tower and the second oxidation tower, and flow regulating valves are provided at positions before and after the circulation pump on the wastewater discharge pipe and on the liquid phase circulation pipe. The liquid level transmitter and the flow regulating valves are both connected to a controller to adjust the liquid level heights of the first oxidation tower and the second oxidation tower, so that the liquid level of the first oxidation tower is between the first ozone catalyst packing and the first gas-liquid contact packing, and the liquid level of the second oxidation tower is between the second ozone catalyst packing and the second gas-liquid contact packing.

[0020] The utility model has achieved the following technical effects compared with the prior art:

[0021] The ozone catalytic oxidation tandem tower device provided by the utility model includes a first oxidation tower, a second oxidation tower, a circulation pump and a blower. The first oxidation tower and the second oxidation tower are arranged in series. During use, ozone is introduced into the first oxidation tower from the first ozone inlet of the first oxidation tower, and is blown into the second oxidation tower by the blower through a gas phase pipe. Wastewater is introduced into the second oxidation tower from the second wastewater inlet of the second oxidation tower, and contacts with ozone at the second packing for catalytic oxidation treatment. Then, the wastewater enters the first oxidation tower through a liquid phase balance pipe, and contacts with ozone at the first packing for catalytic oxidation treatment. The purified wastewater enters the circulation pump through the first wastewater outlet of the first oxidation tower. The circulation pump pumps a part of the wastewater into the wastewater discharge pipe for discharge, and pumps another part of the wastewater into the liquid phase circulation pipe, and then introduces it into the first oxidation tower through the first wastewater inlet of the first oxidation tower for cyclic treatment. By arranging two-stage oxidation towers in series, this device strengthens the gas-liquid contact effect, improves the ozone utilization rate, and realizes the deep purification of wastewater. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the ozone catalytic oxidation tandem tower device provided by the embodiment of the present utility model.

[0024] In the figure: 1 - First oxidation tower, 101 - First ozone inlet, 102 - First wastewater outlet, 103 - First wastewater inlet, 104 - First ozone outlet, 105 - First aeration head, 106 - First spray head, 107 - First ozone catalyst packing, 108 - First gas-liquid contact packing, 2 - Second oxidation tower, 201 - Second ozone inlet, 202 - Second wastewater inlet, 203 - Second ozone outlet, 204 - Second aeration head, 205 - Second spray head, 206 - Second ozone catalyst packing, 207 - Second gas-liquid contact packing, 3 - Circulation pump, 4 - Blower, 5 - Gas phase pipe, 6 - Liquid phase balance pipe, 7 - Wastewater discharge pipe, 8 - Liquid phase circulation pipe. Detailed implementation manners

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The purpose of the present invention is to provide an ozone catalytic oxidation tandem tower device to solve the problems existing in the prior art. By connecting two oxidation towers in series, the gas-liquid contact effect is enhanced, the ozone utilization rate is improved, and the deep purification of wastewater is achieved.

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0028] As Figure 1As shown in the figure, this embodiment provides an ozone catalytic oxidation combined tower device, including a first oxidation tower 1, a second oxidation tower 2, a circulation pump 3, and a blower 4. Among them, a first ozone inlet 101 and a first wastewater outlet 102 are provided at the lower part of the first oxidation tower 1, and a first wastewater inlet 103 and a first ozone outlet 104 are provided at the upper part of the first oxidation tower 1; a second ozone inlet 201 is provided at the lower part of the second oxidation tower 2, and a second wastewater inlet 202 and a second ozone outlet 203 are provided at the upper part of the second oxidation tower 2; the first ozone inlet 101 of the first oxidation tower 1 is used to introduce ozone, and the first ozone outlet 104 of the first oxidation tower 1 is connected to the second ozone inlet 201 of the second oxidation tower 2 through a gas phase pipe 5, and the blower 4 is arranged on the gas phase pipe 5; the second wastewater inlet 202 of the second oxidation tower 2 is used to introduce wastewater, and the bottom of the second oxidation tower 2 is connected to the bottom of the first oxidation tower 1 through a liquid phase balance pipe 6; a wastewater discharge pipe 7 is connected to the first wastewater outlet 102 of the first oxidation tower 1, the circulation pump 3 is arranged on the wastewater discharge pipe 7, and a liquid phase circulation pipe 8 is connected to the position behind the pump of the circulation pump 3 on the wastewater discharge pipe 7, and one end of the liquid phase circulation pipe 8 away from the wastewater discharge pipe 7 is connected to the first wastewater inlet 103 of the first oxidation tower 1; a first filler is arranged in the first oxidation tower 1, and a second filler is arranged in the second oxidation tower 2, so that the ozone introduced into the first oxidation tower 1 can catalytically oxidize the wastewater introduced into the second oxidation tower 2.

[0029] In this embodiment, a first aeration head 105 is arranged at a position in the first oxidation tower 1 close to the first ozone inlet 101, and the first ozone inlet 101 is communicated with the first aeration head 105.

[0030] In this embodiment, a first spray head 106 is arranged at a position in the first oxidation tower 1 close to the first wastewater inlet 103, and the first wastewater inlet 103 is communicated with the first spray head 106.

[0031] In this embodiment, the first filler includes a first ozone catalyst filler 107 and a first gas-liquid contact filler 108. The first ozone catalyst filler 107 is arranged at the lower part of the first oxidation tower 1 and above the first aeration head 105; the first gas-liquid contact filler 108 is arranged at the upper part of the first oxidation tower 1 and below the first spray head 106.

[0032] Further, the first ozone catalyst filler 107 is an iron-manganese multi-metal oxide filler; the first gas-liquid contact filler 108 is a Pall ring filler.

[0033] In this embodiment, a second aeration head 204 is arranged at a position in the second oxidation tower 2 close to the second ozone inlet 201, and the second ozone inlet 201 is communicated with the second aeration head 204.

[0034] In this embodiment, a second spray head 205 is disposed at a position in the second oxidation tower 2 near the second wastewater inlet 202, and the second wastewater inlet 202 is communicated with the second spray head 205.

[0035] In this embodiment, the second packing includes a second ozone catalyst packing 206 and a second gas-liquid contact packing 207. The second ozone catalyst packing 206 is disposed at the lower part of the second oxidation tower 2 and above the second aeration head 204; the second gas-liquid contact packing 207 is disposed at the upper part of the second oxidation tower 2 and below the second spray head 205.

[0036] Furthermore, the second ozone catalyst packing 206 is a copper-cerium metal oxide packing; the second gas-liquid contact packing 207 is a corrugated wire mesh packing.

[0037] In this embodiment, level transmitters are disposed on both the first oxidation tower 1 and the second oxidation tower 2. Flow regulating valves are disposed at positions before and after the pump of the circulation pump 3 on the wastewater discharge pipe 7 and on the liquid phase circulation pipe 8. The level transmitters and the flow regulating valves are both connected to the controller to adjust the liquid level heights of the first oxidation tower 1 and the second oxidation tower 2, so that the liquid level of the first oxidation tower 1 is between the first ozone catalyst packing 107 and the first gas-liquid contact packing 108, and the liquid level of the second oxidation tower 2 is between the second ozone catalyst packing 206 and the second gas-liquid contact packing 207. That is, the settings of the level transmitters, the flow regulating valves and the controller realize the automatic control of the liquid level in the tower between the ozone catalyst packing and the gas-liquid contact packing through the inlet and outlet flow rates of the circulation pump 3.

[0038] It should be noted that the first aeration head 105 and the second aeration head 204 in this embodiment are both preferably microporous aerators, which can perform microporous aeration on the ozone introduced into the bottom liquid phase part.

[0039] It should be noted that the first spray head 106 and the second spray head 205 in this embodiment both include a plurality of spiral nozzle spray heads evenly distributed at the upper part of the tower body.

[0040] It should be noted that the first ozone catalyst packing 107, the second ozone catalyst packing 206, the first gas-liquid contact packing 108, and the second gas-liquid contact packing 207 in this embodiment are all installed in the corresponding tower through conventional packing support frames; for the ozone catalysts in the first ozone catalyst packing 107 and the second ozone catalyst packing 206, those skilled in the art can select different active metal oxide-supported ozone catalysts according to needs; for the first gas-liquid contact packing 108 and the second gas-liquid contact packing 207, those skilled in the art can respectively adopt bulk packing and structured packing according to needs; when conducting oxidation tests on high-concentration organic wastewater and using the ozone catalytic oxidation combined tower device provided in this embodiment, compared with the conventional single-tower single-catalyst oxidation method, the ozone utilization rate is increased by more than 30%, and the water production index (oxidation effect) is improved by 20%.

[0041] The specific process of wastewater treatment using the ozone catalytic oxidation combined tower device provided in this embodiment is as follows:

[0042] The wastewater enters the second spray head 205 from the second wastewater inlet 202 of the second oxidation tower 2, and after being sprayed, it enters the second gas-liquid contact packing 207. After the wastewater undergoes gas-liquid contact absorption with ozone at the second gas-liquid contact packing 207, it enters the liquid phase part. The liquid level of the second oxidation tower 2 is controlled between the second ozone catalyst packing 206 and the second gas-liquid contact packing 207; the wastewater in the second oxidation tower 2 enters the first oxidation tower 1 through the liquid phase balance pipe 6. The wastewater in the first oxidation tower 1 enters the circulation pump 3 through the first wastewater outlet 102. The outlet of the circulation pump 3 is connected to two paths. One path is the liquid phase circulation pipe 8, which is connected to the first wastewater inlet 103 of the first oxidation tower 1, so that the wastewater sequentially passes through the first spray head 106, the first gas-liquid contact packing 108, and the first ozone catalyst packing 107, and then returns to the inlet of the circulation pump 3 through the first wastewater outlet 102; the other path of the outlet of the circulation pump 3 is the wastewater discharge pipe 7, which is used to discharge the qualified wastewater out of the system.

[0043] Ozone is introduced from the first ozone inlet 101 of the first oxidation tower 1 and undergoes microporous aeration through the first aeration head 105. The ozone gas phase passes through the first ozone catalyst packing 107 in the form of bubbles, and then enters the first gas-liquid contact packing 108 to contact and absorb the sprayed wastewater; the ozone in the first oxidation tower 1 enters the inlet of the blower 4 through the gas phase pipe 5 from the first ozone outlet 104, and after being pressurized by the blower 4, it enters the second ozone inlet 201 of the second oxidation tower 2, undergoes aeration through the second aeration head 204, and then sequentially passes through the second ozone catalyst packing 206 and the second gas-liquid contact packing 207 to contact, absorb, and oxidize the wastewater, and finally is discharged from the system to the tail gas treatment unit through the second ozone outlet 203.

[0044] This device has the following advantages:

[0045] First, the tower connection method is adopted in the structure. The secondary tail gas of the first oxidation tower 1 is used for catalytic oxidation to make full use of ozone, thus improving the utilization efficiency of ozone.

[0046] Second, the tower bodies of the first oxidation tower 1 and the second oxidation tower 2 adopt a structure that combines packing absorption with gas-liquid contact and adsorption catalysis with liquid-solid contact, which improves the contact effect and the utilization rate of ozone.

[0047] Third, aiming at the difference in the ozone gas phase composition of the two towers, for the packing part, the first oxidation tower 1 uses Pall rings and other bulk packings with low pressure drop and high throughput for ozone to contact and absorb with the wastewater, and the second oxidation tower 2 uses corrugated structured packings with a contact area 5 times higher than that of the bulk packing for secondary contact and absorption, further improving the utilization rate of ozone.

[0048] Fourth, aiming at the different characteristics of multiple pollution components, according to the difference in the oxidation selectivity of the catalyst, different catalytic oxidants can be set in the two towers for oxidation degradation respectively, improving the oxidation effect.

[0049] In summary, through the innovative design of the tower structure and the scientific configuration of catalytic materials, this device adopts a series of two-stage oxidation towers, combines the ozone absorption of the packing and the adsorption oxidation of the catalyst, and uses a multi-type combination technology to enhance the three-phase mass transfer effect of gas-liquid-solid, improve the utilization rate of ozone, and achieve the deep purification of wastewater.

[0050] In this utility model, specific examples are used to illustrate the principle and implementation mode of the utility model. The description of the above embodiments is only used to help understand the method and its core idea of the utility model; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be construed as a limitation to the utility model.

Claims

1. An ozone catalytic oxidation tower device, characterized in that: It comprises a first oxidation tower, a second oxidation tower, a circulation pump and a blower, wherein a first ozone inlet and a first wastewater outlet are arranged at the lower part of the first oxidation tower, and a first wastewater inlet and a first ozone outlet are arranged at the upper part of the first oxidation tower; a second ozone inlet is arranged at the lower part of the second oxidation tower, and a second wastewater inlet and a second ozone outlet are arranged at the upper part of the second oxidation tower; The first ozone inlet of the first oxidation tower is used for introducing ozone, and the first ozone outlet of the first oxidation tower is connected to the second ozone inlet of the second oxidation tower through a gas phase pipe, and the blower is arranged on the gas phase pipe; the second wastewater inlet of the second oxidation tower is used for introducing wastewater, and the bottom of the second oxidation tower is connected to the bottom of the first oxidation tower through a liquid phase balance pipe; the first wastewater outlet of the first oxidation tower is connected to a wastewater discharge pipe, the circulating pump is arranged on the wastewater discharge pipe, and a liquid phase circulation pipe is connected to the wastewater discharge pipe at a position behind the circulating pump, and one end of the liquid phase circulation pipe away from the wastewater discharge pipe is connected to the first wastewater inlet of the first oxidation tower; A first filler is arranged in the first oxidation tower, and a second filler is arranged in the second oxidation tower, so that the ozone introduced into the first oxidation tower can catalytically oxidize the wastewater introduced into the second oxidation tower.

2. The ozone catalytic oxidation combined tower device according to claim 1, characterized in that: A first aeration head is arranged in the first oxidation tower at a position close to the first ozone inlet, and the first ozone inlet is connected to the first aeration head.

3. The ozone catalytic oxidation combined tower device according to claim 2, characterized in that: A first spray head is arranged at a position near the first wastewater inlet in the first oxidation tower, and the first wastewater inlet is connected to the first spray head.

4. The ozone catalytic oxidation combined tower device according to claim 3, characterized in that: The first filler includes a first ozone catalyst filler and a first gas-liquid contact filler. The first ozone catalyst filler is arranged at the lower part of the first oxidation tower and above the first aeration head; the first gas-liquid contact filler is arranged at the upper part of the first oxidation tower and below the first spray head.

5. The ozone catalytic oxidation combined tower device according to claim 4, characterized in that: The first ozone catalyst filler is an iron-manganese multinary metal oxide filler; the first gas-liquid contact filler is a ball ring filler.

6. The ozone catalytic oxidation combined tower device according to claim 5, characterized in that: A second aeration head is arranged in the second oxidation tower at a position close to the second ozone inlet, and the second ozone inlet is communicated with the second aeration head.

7. The ozone catalytic oxidation combined tower device according to claim 6, characterized in that: A second spray head is arranged in the second oxidation tower at a position close to the second wastewater inlet, and the second wastewater inlet is connected to the second spray head.

8. The ozone catalytic oxidation combined tower device according to claim 7, characterized in that: The second filler includes a second ozone catalyst filler and a second gas-liquid contact filler. The second ozone catalyst filler is arranged at the lower part of the second oxidation tower and above the second aeration head; the second gas-liquid contact filler is arranged at the upper part of the second oxidation tower and below the second spray head.

9. The ozone catalytic oxidation combined tower device according to claim 8, characterized in that: The second ozone catalyst filler is a copper-cerium metal oxide filler; the second gas-liquid contact filler is a corrugated wire mesh filler.

10. The ozone catalytic oxidation combined tower device according to claim 9, characterized in that: The first oxidation tower and the second oxidation tower are both provided with liquid level transmitters, and flow regulating valves are provided at positions in front of and behind the circulating pump on the wastewater discharge pipe and on the liquid phase circulation pipe. The liquid level transmitter and the flow regulating valve are both connected to a controller to adjust the liquid level heights of the first oxidation tower and the second oxidation tower so that the liquid level of the first oxidation tower is located between the first ozone catalyst packing and the first gas-liquid contact packing, and the liquid level of the second oxidation tower is located between the second ozone catalyst packing and the second gas-liquid contact packing.

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