Coking wastewater treatment device combining ozone catalytic oxidation with activated carbon based on supergravity

Abstract

The utility model discloses a supergravity-based catalytic ozonation and activated carbon combined coking wastewater treatment device, and belongs to the technical field of sewage treatment. The supergravity-based catalytic ozonation and activated carbon combined coking wastewater treatment device comprises a catalytic oxidation device shell and a pressure container tank, ozone catalyst layers are arranged in the catalytic oxidation device shell, an ozone distribution device is arranged between the ozone catalyst layers, an activated carbon rotating packed bed is arranged on the upper portion of each ozone catalyst layer, and a high-pressure hubbed welding neck flange is arranged between each activated carbon rotating packed bed and the corresponding ozone catalyst layer. And the activated carbon rotary packed bed is connected with a motor. The device is small in occupied area and good in treatment effect, the ozone utilization rate and the mass transfer effect are effectively improved, and the effluent quality is improved.

Description

Technical Field

[0001] This utility model patent relates to the field of wastewater treatment technology, specifically to a device for treating wastewater from ozone catalytic oxidation combined with activated carbon coking based on hypergravity. Technical Background

[0002] In China, coking wastewater generally adopts a three-stage treatment process: pretreatment + biological treatment + advanced treatment. To comprehensively remove recalcitrant organic pollutants from the effluent after biological treatment, the commonly used advanced treatment technologies are advanced oxidation technology and activated carbon adsorption technology.

[0003] Advanced oxidation technologies (AORs) primarily utilize highly reactive oxidizing groups, including hydroxyl radicals, sulfate radicals, superoxide radicals, and singlet oxygen, to perform addition, bond breaking, substitution, and electron transfer reactions with target organic matter. This non-selective oxidation transforms recalcitrant macromolecular organic matter into easily degradable smaller molecules, and even mineralizes them into CO2 and H2O. Hydroxyl radicals, due to their strong oxidizing power (2.8 eV), have been the most extensively studied. AORs are effective at treating recalcitrant organic matter and can address the issue of substandard COD in biochemical effluents, making them an important organic matter removal technology in industrial wastewater treatment. AORs mainly include Fenton oxidation, ozone catalytic oxidation, photocatalytic oxidation, electrocatalytic oxidation, and persulfate oxidation. Fenton oxidation requires precise control of reaction conditions, including pH and reagent dosage. Under neutral and alkaline conditions, this reaction can produce iron sludge precipitates, affecting the catalytic oxidation effect and causing secondary pollution. Photocatalytic oxidation, electrocatalytic oxidation, and persulfate oxidation are relatively expensive. Therefore, ozone catalytic oxidation is currently the dominant AOR technology in wastewater treatment. Ozone catalytic oxidation technology is highly effective in removing recalcitrant organic pollutants. Furthermore, with the increasing maturity of production technologies for new catalyst materials and core components such as ozone generators, costs have decreased to an acceptable level, leading to its widespread application in wastewater treatment projects. However, ozone catalytic oxidation technology suffers from low ozone utilization, poor mass transfer, and poor degradation of highly oxidized long-chain hydrocarbons. Single-stage ozone catalytic oxidation alone has limited removal rates for coking wastewater effluent, reaching a maximum of only 30%.

[0004] Adsorbents used in the research of advanced treatment of coking wastewater include activated carbon, fly ash, pulverized coal, steel slag, bentonite, diatomaceous earth, zeolite, and activated coke. Currently, research on adsorbents for coking wastewater mainly focuses on activated carbon. The fine pore structure and large surface area of ​​activated carbon can adsorb pollutants, providing ample sites for their efficient degradation. Although activated carbon can effectively remove organic matter, its large-scale application is expensive and regeneration is complex. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model patent is to provide a coking wastewater treatment device based on supergravity ozone catalytic oxidation combined with activated carbon. This device has a small footprint and good treatment effect. It couples ozone catalytic oxidation and activated carbon adsorption to treat coking wastewater. After ozone catalytic oxidation treatment, the large molecular benzene rings and long chains of the biochemical effluent of coking wastewater are degraded and broken. The activated carbon adsorption method can further remove NH3-N, cyanide, and persistent organic pollutants that are harmful to the environment, as well as small molecular organic pollutants that have been degraded by advanced oxidation technologies such as ozone catalytic oxidation, thereby improving the quality of the effluent.

[0006] To achieve the above objectives, this utility model patent adopts the following technical solution:

[0007] This invention provides a combined ozone catalytic oxidation and activated carbon coking wastewater treatment device based on supergravity, comprising a catalytic oxidation device shell and a pressure vessel tank. The pressure vessel tank is equipped with a pressure relief valve at the top. Ozone enters the pressure vessel tank after being collected by an ozone injection pipe, recovered ozone tail gas, and part of the returned effluent. The pressure vessel tank is filled with pressure vessel packing material. The gas-water mixture in the pressure vessel tank is connected to an ozone distribution device through a pressure relief valve. After pressure relief, the ozone pre-dissolved in the water escapes as fine bubbles, increasing the mass transfer efficiency and utilization rate of ozone.

[0008] The catalytic oxidation device shell has an electric motor and an ozone exhaust gas recovery port at its top, which is connected to a pressure vessel. The upper part of the shell has an outlet and a partial return outlet, with an overflow trough above the outlet. The partial return outlet is connected to the pressure vessel via a pressurized water pump. The bottom of the shell has an inlet and an ozone distribution device. Coking wastewater enters the shell through the inlet, flows downwards, and exits through the outlet at the top. Inside the shell is a bottom support connected to a fiberglass grating. A support layer is located on top of the grating, and two ozone catalyst layers are placed above it. An ozone distribution device is located between the ozone catalyst layers, and a rotating activated carbon bed is placed above the ozone catalyst layers. Coking wastewater enters the activated carbon rotary packed bed from the ozone catalyst layer. After treatment by the ozone catalyst layer, the large molecular benzene rings and long-chain recalcitrant substances are degraded and broken down. The activated carbon rotary packed bed further removes NH3-N, cyanide, and persistent organic pollutants that are highly harmful to the environment from the coking wastewater, as well as small molecular organic pollutants that have been degraded by the ozone catalyst layer, thereby improving the quality of the effluent.

[0009] It should be noted that a high-pressure weld neck flange is provided between the activated carbon rotary packed bed and the ozone catalyst layer. The activated carbon rotary packed bed is filled with activated carbon particles and is connected to an electric motor. The top of the high-pressure weld neck flange has a neck-type inlet. Driven by the electric motor, the rotary packed bed's packing rotor rotates at high speed. Coking wastewater enters the inner edge of the activated carbon rotary packed bed through the neck-type inlet and is rapidly thrown to the edge of the bed by centrifugal force, where it is torn into tiny units such as droplets, liquid films, and liquid filaments, forming a large and rapidly renewing specific surface area. Ozone contacts the activated carbon particles under the action of pressure difference, and the gas, liquid, and solid phases are fully contacted, enhancing the utilization rate and mass transfer effect of ozone and improving the quality of the effluent.

[0010] It should be noted that the catalytic oxidation device is equipped with a maintenance drain in the middle of the shell. When the activated carbon rotary packed bed needs maintenance or the activated carbon particles in the activated carbon rotary packed bed need to be replaced, the maintenance drain can be opened to prevent water leakage. The replacement or maintenance can be carried out by disassembling the high-pressure necked welding flange.

[0011] Furthermore, the ozone distribution device is arranged in a three-horizontal-three-vertical cross pattern to enhance the uniformity of gas distribution.

[0012] In summary, this utility model has the following advantages:

[0013] (1) A supergravity-based ozone catalytic oxidation combined with activated carbon coking wastewater treatment device couples ozone catalytic oxidation and activated carbon adsorption to treat coking wastewater. Ozone tail gas is recovered and reused, and part of the coking wastewater is recycled as dissolved gas. After depressurization and release, ozone enters the shell of the catalytic oxidation device in the form of microbubbles, which enhances the ozone mass transfer efficiency. After ozone catalytic oxidation treatment, the large molecular benzene rings and long chains of the biochemical effluent from coking wastewater are degraded and broken. Activated carbon adsorption can further remove NH3-N, cyanide, and persistent organic pollutants that are harmful to the environment, as well as small molecular organic pollutants that have been degraded by advanced oxidation technologies such as ozone catalytic oxidation, thus improving the effluent quality.

[0014] (2) The activated carbon rotary packing bed rotates at high speed driven by the motor. The coking wastewater enters the inner edge of the activated carbon rotary packing bed from the neck inlet. Under the action of centrifugal force, it is quickly thrown to the edge of the activated carbon rotary packing bed and then torn into tiny units such as droplets, liquid films, and liquid filaments. Ozone comes into full contact with the coking wastewater and activated carbon particles under the action of pressure difference, which enhances the utilization rate and mass transfer effect of ozone.

[0015] (3) The whole set of equipment has a small footprint, high efficiency, simple design and compact structure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] In the diagram, 100-pressure vessel tank, 101-pressure relief valve, 102-pressure vessel tank packing, 103-pressure relief valve, 104-ozone injection, 200-catalytic oxidation device shell, 201-water inlet, 202-ozone distribution device, 203-bottom support, 204-fiberglass grating, 205-support layer, 206-ozone catalyst layer, 207-pressurized water pump, 208-high pressure weld neck flange, 209-activated carbon rotary packed bed, 210-overflow trough, 211-water outlet, 212-motor, 213-ozone tail gas recovery port, 214-partial return outlet, 215-maintenance drain.

[0018] Figure 2 This is a schematic diagram of the high-pressure necked welding flange of this utility model.

[0019] In the diagram, 208 is a high-pressure weld neck flange, and 2081 is a necked inlet.

[0020] Figure 3 This is a schematic diagram of the ozone distribution device of this utility model. Detailed Implementation

[0021] The present utility model patent will be further described in detail below with reference to the accompanying drawings and examples:

[0022] The directional terms described in this utility model patent, such as "front," "back," "up," "down," "left," "right," and "center," are based on the directional relationships shown in the accompanying drawings. They are only for the convenience of describing this utility model patent and simplifying the description, and are not intended to indicate specific orientations that the device or equipment must have. Therefore, they should not be construed as limitations on this utility model patent.

[0023] The purpose of this utility model patent is to provide a supergravity-based ozone catalytic oxidation combined with activated carbon coking wastewater treatment device, which has high ozone utilization, good mass transfer effect, small footprint, high efficiency, simple design and compact structure.

[0024] To achieve the above objectives, this utility model patent adopts the following implementation method:

[0025] Please refer to Figure 1 , Figure 2 and Figure 3This is an embodiment of the ozone catalytic oxidation combined with activated carbon coking wastewater treatment device based on hypergravity, characterized in that: the ozone catalytic oxidation combined with activated carbon coking wastewater treatment device based on hypergravity includes a catalytic oxidation device shell (200) and a pressure vessel tank (100); the pressure vessel tank (100) is provided with a pressure relief valve (101) at the top; ozone is collected after being recovered by the ozone injection (104) pipe and the ozone tail gas recovery port (213) and coking wastewater from the partial return outlet (214) enters the pressure vessel tank (100); the partial return outlet (214) is connected to the pressure vessel tank (100) by a pressurized water pump (207) and the pressure vessel tank (100). 00) connected, the pressure vessel tank (100) is filled with pressure vessel packing (102), and ozone is dissolved in the coking wastewater under pressure through the pressure vessel tank (100) and then enters the ozone distribution device (202) through the pressure relief valve (103); the bottom of the catalytic oxidation device shell (200) is provided with an inlet (201) and an ozone distribution device (202). The ozone distribution device (202) is arranged in a three-horizontal and three-vertical cross arrangement. The coking wastewater enters the catalytic oxidation device shell (200) from the inlet (201). The coking wastewater flows from top to bottom and overflows from the overflow trough (210) set at the top of the catalytic oxidation device shell (200) and flows out from the outlet (211). The top of the catalytic oxidation device housing (200) is equipped with an electric motor (212), and the middle of the catalytic oxidation device housing (200) is equipped with a maintenance drain outlet (215); the inside of the catalytic oxidation device housing (200) is equipped with a bottom support (203), the bottom support (203) is connected to a fiberglass grid (204), the upper part of the fiberglass grid (204) is equipped with a support layer (205), the upper part of the support layer (205) is equipped with two ozone catalyst layers (206), the ozone gas distribution device (202) is provided between the ozone catalyst layers, and the upper part of the ozone catalyst layer (206) is equipped with an activated carbon rotating packed bed (209). Coking wastewater enters the activated carbon rotating packed bed (209) through the ozone catalyst layer (206). After treatment by the ozone catalyst layer (206), the large molecular benzene rings and long-chain recalcitrant substances are degraded and broken down. The activated carbon rotating packed bed (209) further removes NH3-N, cyanide, and persistent organic pollutants that pose significant environmental hazards from the coking wastewater, as well as small molecular organic pollutants degraded by the ozone catalyst layer (206), thus improving the effluent quality. The catalytic oxidation device shell (200) is equipped with a bottom support (203), and a high-pressure weld neck flange (208) is provided between the activated carbon rotating packed bed (209) and the ozone catalyst layer (206). The high-pressure weld neck flange (208) has a neck-type inlet (2081) at its top.The activated carbon rotary packed bed (209) is filled with activated carbon particles and is connected to an electric motor (212). The high-pressure necked weld neck flange (208) has a necked inlet (2081) at its top. Driven by the electric motor (212), the rotary packed bed (209) rotates at high speed. Coking wastewater enters the inner edge of the activated carbon rotary packed bed (209) through the necked inlet (2081) and is quickly thrown to the edge of the activated carbon rotary packed bed (209) by centrifugal force, where it is torn into tiny units such as droplets, liquid films, and liquid filaments, forming a large and rapidly renewing specific surface area. Ozone comes into contact with the activated carbon particles under the action of pressure difference, and the gas, liquid, and solid phases are fully contacted, which enhances the utilization rate and mass transfer effect of ozone and improves the quality of the effluent.

[0026] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for treating coking wastewater based on ozone catalytic oxidation combined with activated carbon under conditions of high gravity, characterized in that: The device includes a catalytic oxidation unit housing (200) and a pressure vessel tank (100). A pressure relief valve (101) is provided on the top of the pressure vessel tank (100). Ozone enters the pressure vessel tank (100) through an ozone injection (104) pipe. The pressure vessel tank (100) is filled with pressure vessel packing material (102). The gas-water mixture inside the pressure vessel tank (100) is connected to an ozone distribution device (202) via a pressure relief valve (103). A motor (212) and an ozone tail gas recovery port (213) are provided on the top of the catalytic oxidation unit housing (200). The ozone tail gas recovery port (213) is connected to the pressure vessel tank (100). An outlet (211) and a partial return outlet (214) are provided on the upper part of the catalytic oxidation unit housing (200). An overflow trough (210) is provided on the upper side of the outlet (211). The partial return outlet (214) is connected to the pressure vessel tank via a pressurized water pump (207). (100) Connected; the catalytic oxidation device housing (200) is provided with a maintenance drain outlet (215) in the middle; the catalytic oxidation device housing (200) is provided with a water inlet (201) and an ozone distribution device (202) at the bottom; the catalytic oxidation device housing (200) is provided with a bottom support (203) inside; the bottom support (203) is connected to a fiberglass grid (204); the fiberglass grid (204) is provided with a support layer (205) on the upper part; the support layer (205) is provided with two ozone catalyst layers (206) on the upper part; the ozone distribution device (202) is provided between the ozone catalyst layers (206); the ozone catalyst layer (206) is provided with an activated carbon rotary packing bed (209) on the upper part; the activated carbon rotary packing bed (209) and the ozone catalyst layer (206) are provided with a high-pressure necked weld flange (208); the activated carbon rotary packing bed (209) is connected to a motor (212).

2. The ozone catalytic oxidation combined with activated carbon coking wastewater treatment device based on supergravity as described in claim 1, characterized in that: The high-pressure necked welding flange (208) is provided with a necked water inlet (2081) on the top.

3. The ozone catalytic oxidation combined with activated carbon coking wastewater treatment device based on supergravity as described in claim 1, characterized in that: The ozone distribution device (202) is arranged in a three-horizontal-three-vertical cross pattern.

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