Catalytic oxidation reactor for petrochemical wastewater treatment

Abstract

The utility model discloses a catalytic oxidation reactor for petrochemical wastewater treatment. The catalytic oxidation reactor comprises a reaction tank and a settling tank, the reaction tank comprises a tank body, an ozone catalytic oxidation unit, an electrolytic oxidation unit and a three-phase separator; the settling tank further comprises a runner plate group; the anti-ozone catalytic oxidation unit comprises an inner reaction pipe, an ozone distribution disc, an ozone supply pipe, an ozone return pipe and an upper flow baffle. The utility model provides a reactor integrating catalytic oxidation, electrolytic oxidation and a fluidized bed, and the wastewater treatment efficiency of equipment can be improved through comprehensive treatment. According to the specific structure, wastewater can be forced to circulate in the ozone catalytic oxidation unit and the electrolytic oxidation unit through the arrangement of the flow baffle, the reflux pump and other structures so as to achieve the preset purification target, disturbance of inflow water flow to the precipitation process can be effectively controlled through the arrangement of multiple flow channel plates in the precipitation tank, and the precipitation efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically a catalytic oxidation reactor for treating petrochemical wastewater. Background Technology

[0002] Petrochemical wastewater refers to wastewater generated during petroleum and chemical production processes. This type of wastewater typically contains large amounts of organic matter, suspended solids, heavy metals, and toxic and harmful substances, posing a threat to the environment and human health. Treatment methods for petrochemical wastewater usually employ a comprehensive approach combining physical, chemical, and biological treatment technologies. Through processes such as oil separation, flotation, filtration, coagulation sedimentation, oxidation, electrolysis, and activated sludge, pollutants such as oil, suspended solids, organic matter, and heavy metals in the wastewater are effectively removed, achieving water purification and resource recovery to protect the environment and promote sustainable development. Ozone catalytic oxidation is a commonly used treatment method for petrochemical wastewater, which uses ozone and catalysts to accelerate the oxidation process.

[0003] Due to the complex composition of petrochemical wastewater, the commonly used catalytic oxidation treatment has drawbacks such as low efficiency and long treatment time. Many technologies have been explored to integrate other treatment methods, such as the authorized invention patent CN102040262B, which describes a fluidized bed electrolytic catalytic oxidation reactor and treatment method. This method organically combines electrolytic oxidation, catalytic oxidation, and fluidized bed to significantly improve treatment efficiency. However, the reactor disclosed in this patent is relatively general, and its structure is relatively simple. In experiments, it was found that the treated waste could not be fully circulated in the electrolysis and catalytic oxidation sections, resulting in no significant increase in treatment efficiency. In addition, the sedimentation efficiency in the separator is low. Utility Model Content

[0004] The purpose of this invention is to provide a catalytic oxidation reactor for treating petrochemical wastewater, in order to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides a catalytic oxidation reactor for petrochemical wastewater treatment, comprising a reaction tank and a sedimentation tank, wherein the reaction tank and sedimentation tank are hollow rotary cavity structures; the reaction tank includes a tank body, an ozone catalytic oxidation unit, an electrolytic oxidation unit, and a three-phase separator; the bottom of the tank body is provided with an openable sludge outlet and an inlet pipe, and the top is provided with an outlet pipe; the sedimentation tank includes a sedimentation tank body; the outlet pipe of the reaction tank is connected to the top of the sedimentation tank, the bottom of the sedimentation tank is provided with a return pipe, the return pipe is connected to the inlet pipe, and the top of the sedimentation tank is also provided with a purified water outlet pipe.

[0006] Furthermore, the sedimentation tank also includes a flow channel plate assembly; the flow channel plate assembly includes an inclined baffle plate, a vertical baffle plate, and several vertical guide plates; the inclined baffle plate is located at the connection between the outlet pipe and the sedimentation tank, is arranged at an inclination, and is watertightly connected to the side wall of the sedimentation tank; the vertical baffle plate is located below the inclined baffle plate and is watertightly fixedly connected to the lower part of the inclined baffle plate and the side wall of the sedimentation tank; within the space enclosed by the inclined baffle plate, the vertical baffle plate, and the side wall of the sedimentation tank, several vertical guide plates are provided, and the vertical guide plates are arranged parallel to the vertical baffle plate.

[0007] Furthermore, the height of the vertical baffle is 1 / 3 to 1 / 2 of the height of the settling tank.

[0008] Furthermore, the anti-ozone catalytic oxidation unit includes an inner reaction tube, an ozone distribution plate, an ozone supply pipe, an ozone return pipe, and an upper baffle plate. The inner reaction tube is a tubular structure installed inside the reaction tank, with an ozone distribution plate at its bottom, which is connected to the ozone supply pipe. One end of the ozone return pipe is connected to the top of the reaction tank, and the other end is connected to the ozone supply pipe. The liquid outlet of the inlet pipe is located below the ozone distribution plate, and the other end extends outside the reaction tank. The upper baffle plate is located on the top of the inner reaction tube and is a circular plate with a through hole in the center. The through hole is connected to the top of the inner reaction tube, and the edge is watertightly fixed to the side wall of the tank. Multiple return windows are provided on the top side wall of the inner reaction tube below the upper baffle plate.

[0009] Furthermore, the three-phase separator is mounted on the upper baffle plate and connected to the top of the reaction tube. Inside, there is an array of bent plates with their tips facing upwards, and the upper and lower adjacent bent plates are arranged alternately.

[0010] Furthermore, the electrolytic oxidation unit includes several electrolytic electrodes and several reflux pump suction pipe assemblies; the electrolytic electrodes are plate-shaped structures with arc bends, and the cathodes and anodes are arranged opposite each other in pairs; the reflux pump suction pipe assembly includes a reflux pipe and a reflux pump, the inlet of the reflux pipe is located in the gap area between the inner reaction pipe and the tank body, and the outlet is located below the inner reaction pipe or connected to the inlet pipe.

[0011] This invention provides a reactor integrating catalytic oxidation, electrolytic oxidation, and fluidized bed technology, which can improve the equipment's wastewater treatment efficiency through comprehensive treatment. Structurally, the inclusion of baffles and reflux pumps forces wastewater to circulate within the ozone catalytic oxidation and electrolytic oxidation units to achieve the preset purification target. Within the sedimentation tank, multiple flow channels effectively control the disturbance of the inflow to the sedimentation process, thereby improving sedimentation efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0013] Figure 2 This is a partial cross-sectional view of the sedimentation tank of this utility model.

[0014] Figure 3 This is a partial cross-sectional view of the reaction vessel of this utility model.

[0015] Figure 4 This is a partially enlarged schematic diagram of the reaction vessel of this utility model. Detailed Implementation

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] As attached Figure 1-4 As shown, the catalytic oxidation reactor for petrochemical wastewater treatment disclosed in this utility model includes a reaction tank 1 and a sedimentation tank 2.

[0018] The reaction vessel 1 and the sedimentation vessel 2 are hollow rotary cavity structures.

[0019] The reaction vessel 1 includes a vessel body 10, an ozone catalytic oxidation unit 11, an electrolytic oxidation unit 12, and a three-phase separator 13.

[0020] The tank body 10 is provided with an openable mud outlet 101 and a liquid inlet pipe 102 at the bottom, and a liquid outlet pipe 103 at the top.

[0021] The sedimentation tank 2 includes a sedimentation tank body 20 and a flow channel plate assembly 21.

[0022] The liquid outlet pipe 103 of the reaction tank 1 is connected to the top of the sedimentation tank 2. The bottom of the sedimentation tank 2 is provided with a return pipe 201, which is connected to the inlet pipe 102. The top of the sedimentation tank 2 is also provided with a clean water outlet pipe 202.

[0023] The flow channel plate assembly 21 includes an inclined baffle plate 211, a vertical baffle plate 212, a plurality of vertical guide plates 213, and a filter plate 214.

[0024] The inclined baffle plate 211 is located at the connection between the liquid outlet pipe 103 and the sedimentation tank 2, and is arranged at an inclination. It is watertightly connected to the side wall of the sedimentation tank 2 (specifically, it is fixed by welding). The vertical baffle plate 212 is located below the inclined baffle plate 211 and is watertightly fixedly connected to the lower part of the inclined baffle plate 211 and the side wall of the sedimentation tank 2 (specifically, it is fixed by welding). The height of the vertical baffle plate 212 is 1 / 3 to 1 / 2 of the height of the sedimentation tank 2.

[0025] Within the space enclosed by the inclined baffle plate 211, the vertical baffle plate 212, and the side wall of the sedimentation tank 2, a plurality of vertical guide plates 213 are provided, which are arranged parallel to the vertical baffle plates 212. The vertical guide plates 213 allow the liquid flowing into the sedimentation tank 2 to flow between the vertical guide plates 213, forming parallel water flows and reducing mutual disturbance.

[0026] The filter screen plate 214 is arranged horizontally and is watertightly connected to the vertical baffle plate 212 and the side wall of the sedimentation tank 2 (specifically, it is fixed by welding). The filter screen plate 214 is provided with an array of through holes. The through holes are relatively large and are mainly used to slow down the water flow and break up larger air bubbles.

[0027] Appendix Figure 2 As shown, multiple vertical guide plates 213 are disposed on the upper part of the filter plate 214 and on the lower part of the filter plate 214. A gap exists between the bottom of the vertical guide plates 213 located on the upper part of the filter plate 214 and the filter plate 214, primarily to prevent solid matter from accumulating at the junction. The vertical guide plates 213 located below the inclined baffle plate 211 have their upper parts at the same distance from the inclined baffle plate 211, or proportional to their distance from the liquid outlet pipe 103, thereby forming an auxiliary... Figure 2 The gradually decreasing trend at the top, as shown, facilitates the flow of liquid exiting from the outlet pipe 103.

[0028] As attached Figure 1 , 3 As shown in Figure 4, the anti-ozone catalytic oxidation unit 11 includes an inner reaction tube 111, an ozone distribution plate 112, an ozone supply pipe 113, an ozone return pipe 114, and an upper baffle plate 115.

[0029] The inner reaction tube 111 is a tubular structure and is installed inside the tank body 10 of the reaction vessel 1. An ozone distribution plate 112 is installed at the bottom. The ozone distribution plate 112 is connected to the ozone generator through the ozone supply pipe 113. One end of the ozone return pipe 114 is connected to the top of the tank body 10 of the reaction vessel 1 to collect excess ozone, and the other end is connected to the ozone supply pipe 113.

[0030] The outlet of the liquid inlet pipe 102 is located below the ozone gas distribution plate 112, and the other end extends to the outside of the reaction tank 1.

[0031] The upper baffle plate 115 is located on the top of the inner reaction tube 111. It is a circular plate with a through hole in the center. The through hole is connected to the top of the inner reaction tube 111, and the edge is watertightly fixed to the side wall of the tank body 10. Multiple reflux windows 116 are provided on the top side wall of the inner reaction tube 111 below the upper baffle plate 115.

[0032] The three-phase separator 13 is mounted on the upper baffle plate 115 and connected to the top of the reaction tube 111. Inside, there are arrayed bent plates with their tips facing upwards, and the upper and lower adjacent bent plates are arranged alternately.

[0033] The electrolytic oxidation unit 12 includes several electrolytic electrodes 121 and several reflux pump suction pipe groups 122.

[0034] The electrolytic electrode 121 is a plate-shaped structure with a circular arc bend. The cathode and anode are arranged opposite each other in pairs, and the cathode and anode are arranged in a circumferential array in the gap between the inner reaction tube 111 and the tank 10.

[0035] The upper baffle plate 115 is made of insulating material, and the upper part of the electrolytic electrode 121 is fixed on the upper baffle plate 115. The specific wiring of the electrode is conventional knowledge in the field.

[0036] The reflux pump suction assembly 122 includes a reflux pipe a and a reflux pump b. The inlet of the reflux pipe a is located in the gap area between the inner reaction pipe 111 and the tank 10, and the outlet is located below the inner reaction pipe 111 or connected to the inlet pipe 102. The reflux pump b is installed inside the reflux pipe a, which enables multiple circulation of wastewater between the anti-ozone catalytic oxidation unit 11 and the electrolytic oxidation unit 12.

[0037] It should be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A catalytic oxidation reactor for treating petrochemical wastewater, characterized in that, The system includes a reaction tank and a sedimentation tank, both of which are hollow, rotating cavity structures. The reaction tank includes a tank body, an ozone catalytic oxidation unit, an electrolytic oxidation unit, and a three-phase separator. The tank body has an openable sludge outlet and a liquid inlet at the bottom, and a liquid outlet at the top. The sedimentation tank includes a sedimentation tank body. The liquid outlet of the reaction tank is connected to the top of the sedimentation tank. The sedimentation tank has a return liquid pipe at the bottom, which is connected to the liquid inlet. The sedimentation tank also has a purified water outlet pipe at the top.

2. The catalytic oxidation reactor for petrochemical wastewater treatment according to claim 1, characterized in that, The sedimentation tank also includes a flow channel plate assembly; the flow channel plate assembly includes an inclined baffle plate, a vertical baffle plate, and several vertical guide plates; the inclined baffle plate is located at the connection between the liquid outlet pipe and the sedimentation tank, is arranged at an inclination, and is watertightly connected to the side wall of the sedimentation tank; the vertical baffle plate is located below the inclined baffle plate and is watertightly fixedly connected to the lower part of the inclined baffle plate and the side wall of the sedimentation tank; within the space enclosed by the inclined baffle plate, the vertical baffle plate, and the side wall of the sedimentation tank, several vertical guide plates are provided, and the vertical guide plates are arranged parallel to the vertical baffle plate.

3. The catalytic oxidation reactor for petrochemical wastewater treatment according to claim 2, characterized in that, The height of the vertical baffle is 1 / 3 to 1 / 2 of the height of the settling tank.

4. The catalytic oxidation reactor for petrochemical wastewater treatment according to claim 1, characterized in that, The ozone catalytic oxidation unit includes an inner reaction tube, an ozone distribution plate, an ozone supply pipe, an ozone return pipe, and an upper baffle plate. The inner reaction tube is a tubular structure installed inside the reaction tank, with an ozone distribution plate at its bottom, which is connected to the ozone supply pipe. One end of the ozone return pipe is connected to the top of the reaction tank, and the other end is connected to the ozone supply pipe. The liquid inlet is located below the ozone distribution plate, and the other end extends outside the reaction tank. The upper baffle plate is located on the top of the inner reaction tube and is a circular plate with a through hole in the center. The through hole is connected to the top of the inner reaction tube, and the edge is watertightly fixed to the side wall of the tank. Multiple return windows are provided on the top side wall of the inner reaction tube below the upper baffle plate.

5. The catalytic oxidation reactor for petrochemical wastewater treatment according to claim 4, characterized in that, The three-phase separator is mounted on the upper baffle plate and connected to the top of the reaction tube. Inside, there are arrayed bent plates with their tips facing upwards, and the upper and lower adjacent bent plates are arranged alternately.

6. The catalytic oxidation reactor for petrochemical wastewater treatment according to claim 4, characterized in that, The electrolytic oxidation unit includes several electrolytic electrodes and several reflux pump suction pipe groups; the electrolytic electrodes are plate-shaped structures with arc bends, and the cathodes and anodes are arranged opposite each other in pairs; the reflux pump suction pipe group (122) includes a reflux pipe and a reflux pump, the inlet of the reflux pipe is located in the gap area between the inner reaction pipe and the tank body, and the outlet is located below the inner reaction pipe or connected to the inlet pipe.

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