Ozone catalytic oxidation sewage treatment device

Abstract

A catalytic ozonation sewage treatment device is mainly used for treating petrochemical wastewater and comprises a rectangular frustum reaction tower with a narrow top and a wide bottom as a main body, a water inlet pipe arranged on the side wall of the top of the tower and connected to a rectangular spraying plate at the upper part of the reaction tower, a cone top arranged at the top of the reaction tower, an ozone destructor connected to the top of the cone top, and an arc-shaped base plate arranged at the bottom of the tower body, the side wall of the bottom of the tower body is connected with an inlet of a water outlet pipe, a first catalytic filler layer at the upper part is arranged in the tower body, a second catalytic filler layer at the lower part is arranged in the tower body, a horizontal first mesh sieve plate is arranged between the first catalytic filler layer and the second catalytic filler layer, and a horizontal second mesh sieve plate is arranged below the second catalytic filler layer; a horizontal rectangular microporous aeration plate is arranged at the lower part of the second mesh sieve plate and is connected with an external ozone generator through a pipeline. The device has the characteristics of uniform gas-liquid mixing and high ozone utilization rate.

Description

Technical Field

[0001] The utility model relates to a sewage ozone degradation device, which is mainly used for the treatment of petrochemical wastewater. Background Art

[0002] Petrochemical wastewater is the wastewater generated in the petrochemical industrial production process. The wastewater contains a large amount of refractory organic matters such as ketones, alcohols, and nitriles. Conventional treatment processes are difficult to meet the standards. Most domestic sewage treatment plants adopt a treatment device with ozone catalytic oxidation as the core. However, in the actual operation process, there are problems such as low catalytic efficiency, unreasonable reaction tower structure resulting in uneven gas-liquid mixing, and low ozone gas utilization efficiency. Developing and optimizing the internal structure of the ozone catalytic oxidation device to improve the catalytic reaction efficiency is of great significance for reducing the cost of petrochemical wastewater treatment.

[0003] The existing patent (application number: CN201420379652.6) discloses an ozone catalytic oxidation water treatment device. The device mainly consists of a titanium microporous aerator, an H2O2 dosing system, a liquid specific catalyst dosing system, a solid specific catalyst, a corrugated plate demister, and a tail gas collection and destruction system. The wastewater enters the treatment device through the water inlet pipe. Different numbers of ozone dosing systems, H2O2 dosing systems, liquid specific catalyst dosing systems, and solid specific catalysts are installed at the bottom, middle, and upper parts respectively. At the same time, the tail gas is collected and sent to the destruction system for destruction after being demisted by the corrugated plate, avoiding harm to the environment. The utility model can effectively remove the chromaticity and COD in industrial wastewater, and the treatment method is simple, with low cost and high treatment efficiency. However, by adding devices such as an H2O2 solution dosing device and a titanium microporous aerator, the effluent quality will be improved to a certain extent, but the cost will increase significantly. Summary of the Invention

[0004] The purpose of the utility model is to provide an ozone catalytic oxidation sewage treatment device with uniform gas-liquid mixing and high ozone utilization rate for the deficiencies of the existing technical devices.

[0005] Specifically, it is implemented as follows. An ozone catalytic oxidation sewage treatment device has a reaction tower in the shape of a rectangular frustum with a narrow top and a wide bottom. There is a water inlet pipe on the side wall of the top of the tower connected to a rectangular spray plate at the upper part of the reaction tower. There is a conical top at the top of the reaction tower, and an ozone destructor is connected to the top of the conical top. There is an arc-shaped chassis at the bottom of the tower body, and the bottom side wall is connected to the inlet of a water outlet pipe. There is a first catalytic packing layer in the upper part inside the tower body, and a second catalytic packing layer in the lower part. A horizontal first sieve plate is arranged between the first catalytic packing layer and the second catalytic packing layer. A horizontal second sieve plate is arranged below the second catalytic packing layer. A horizontal rectangular microporous aeration plate is arranged below the second sieve plate. The microporous aeration plate is connected to an external ozone generator through a pipeline.

[0006] Sewage enters the top of the reaction tower evenly through the spray plate from the inlet pipe and then flows downward in the tower body. At the same time, the ozone generator is started to release ozone gas from the microporous aeration plate at the bottom of the reaction tower into the water body. The sewage passes through the first catalytic packing layer and the second catalytic packing layer from top to bottom, and the ozone gas passes through the first sieve plate 7 and the second sieve plate from bottom to top. Among them, the slightly larger bubbles are screened into tiny bubbles and incorporated into the water to undergo an oxidation reaction through the catalyst to degrade the pollutants in the sewage. The treated water is discharged through the outlet pipe at the bottom, and the excess ozone gas enters the top conical top and is discharged through the ozone destructor.

[0007] Further, an adjustable flowmeter is connected to the pipeline connecting the microporous aeration plate and the ozone generator to control the gas flow rate.

[0008] Further, a waste liquid pipe is connected to the bottom of the reaction tower, and a ball valve is installed on the pipeline, which is used to drain the wastewater in the tower during maintenance.

[0009] Further, the height of the reaction tower is 5-6 times the width of the bottom.

[0010] Further, a maintenance hole is installed on the side wall of the tower body of the first catalytic packing layer and the second catalytic packing layer of the reaction tower.

[0011] The beneficial effects of the present utility model are as follows:

[0012] 1. By arranging a fine mesh sieve at the lower end of the catalytic packing, the large bubbles of the ozone gas produced by the ozone generator are screened into small bubbles, which is convenient for more uniform mixing of gas and liquid.

[0013] 2. By setting the reaction tower to have more packing in the lower part and less packing in the upper part, matching the characteristic that the ozone gas concentration gradually decreases from bottom to top, the ozone utilization rate can be improved.

[0014] 3. The tower body is set into a flat rectangular frustum cone structure, which is matched with the rectangular spray plate and microporous aeration plate, and can realize uniform up-and-down flow of gas and liquid. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of the present utility model.

[0016] Figure 2 It is a top view of the present utility model.

[0017] In the figure: 1 reaction tower, 2 inlet pipe, 3 outlet pipe, 4 spray plate, 5 first catalytic packing layer, 6 second catalytic packing layer, 7 first sieve plate, 8 second sieve plate, 9 ozone generator, 10 adjustable flowmeter, 11 microporous aeration plate, 12 arc chassis, 13 ball valve, 14 waste liquid pipe, 15 maintenance hole, 16 conical top, 17 ozone destructor Specific Embodiments Embodiment 1

[0018] As Figure 1 , Figure 2 shown, an ozone catalytic oxidation sewage treatment device, the main body of which is a reaction tower 1 in the shape of a rectangular frustum with a narrow upper part and a wide lower part. The height of the reaction tower 1 is 5 - 6 times the width of the bottom. There is a water inlet pipe 2 on the side wall of the top of the tower, which is connected to a rectangular spray plate 4 in the upper part of the reaction tower 1. There is a conical top 16 at the top of the reaction tower 1, and an ozone destructor 17 is connected to the top of the conical top 16. There is an arc-shaped chassis 12 at the bottom of the tower body, and a waste liquid pipe 14 is connected to the bottom of the arc-shaped chassis 12. A ball valve 13 is installed on the pipe, which is used to empty the waste water in the tower during maintenance. The bottom side wall is connected to the inlet of an outlet pipe 3. There is a first catalytic packing layer 5 in the upper part inside the tower body, and a second catalytic packing layer 6 in the lower part. A horizontal first sieve plate 7 is arranged between the first catalytic packing layer 5 and the second catalytic packing layer 6. A horizontal second sieve plate 7 is arranged below the second catalytic packing layer 6. An inspection hole 15 is installed on the side wall of the tower body at the edge of the first catalytic packing layer 5 and the second catalytic packing layer 6 of the reaction tower 1. A horizontal rectangular microporous aeration plate 11 is arranged below the second sieve plate 7. The microporous aeration plate 11 is connected to an external ozone generator 9 through a pipe. An adjustable flowmeter 10 is connected to the pipe connecting the microporous aeration plate 11 and the ozone generator 9 to control the gas flow rate.

[0019] Sewage enters the top of the reaction tower 1 evenly through the spray plate 4 from the water inlet pipe 2 and then flows downward in the tower body. At the same time, the ozone generator 9 is started to release ozone gas from the microporous aeration plate 11 at the bottom of the reaction tower 1 into the water body. The sewage passes through the first catalytic packing layer 5 and the second catalytic packing layer 6 from top to bottom, and the ozone gas passes through the first sieve plate 7 and the second sieve plate 9 from bottom to top. Among them, the slightly larger bubbles are screened into tiny bubbles and dissolved in the water to undergo an oxidation reaction through the catalyst to degrade the pollutants in the sewage. The treated water is discharged through the outlet pipe 3 at the bottom, and the excess ozone gas enters the top conical top 16 and is discharged after being treated by the ozone destructor 17.

Claims

1. An ozone catalytic oxidation sewage treatment device, the main body of which is a reaction tower in the shape of a rectangular frustum with a narrow top and a wide bottom. There is a water inlet pipe on the side wall of the top of the tower, which is connected to a rectangular spray plate in the upper part of the reaction tower. There is a conical top at the top of the reaction tower, and an ozone destructor is connected to the top of the conical top. It is characterized in that: An arc-shaped chassis is provided at the bottom of the tower body. The bottom side wall is connected to the inlet of a water outlet pipe. Inside the tower body, there is a first catalytic packing layer in the upper part and a second catalytic packing layer in the lower part. A horizontal first sieve plate is arranged between the first catalytic packing layer and the second catalytic packing layer. A horizontal second sieve plate is arranged below the second catalytic packing layer. A horizontal rectangular microporous aeration plate is arranged below the second sieve plate. The microporous aeration plate is connected to an external ozone generator through a pipeline.

2. The ozone catalytic oxidation sewage treatment device according to claim 1, characterized in that: An adjustable flowmeter is connected to the pipeline connecting the microporous aeration plate and the ozone generator.

3. An ozone catalytic oxidation sewage treatment device according to claim 1, characterized in that: A waste liquid pipe is connected to the bottom of the reaction tower, and a ball valve is installed on the pipeline.

4. An ozone catalytic oxidation sewage treatment device according to claim 1, characterized in that: The height of the reaction tower is 5-6 times the width of the bottom.

5. An ozone catalytic oxidation sewage treatment device according to claim 1, characterized in that: An inspection hole is installed on the side wall of the tower body at the side of the first catalytic packing layer and the second catalytic packing layer of the reaction tower.

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