Electrocatalytic oxidation degradation device for cyanide-containing wastewater

Abstract

The application discloses a device for electrocatalytic oxidation degradation of cyanide-containing wastewater, which comprises a wastewater electrolytic cell, a high-pressure oxygen increasing mechanism, a flow stirring mechanism and an electrolytic assembly. The flow stirring mechanism and the electrolytic assembly are fixedly installed in the interior of the wastewater electrolytic cell. The high-pressure oxygen increasing mechanism is fixedly installed on one side of the wastewater electrolytic cell and has one end located in the interior of the wastewater electrolytic cell. The high-pressure oxygen increasing mechanism comprises a fan drum box, a first air outlet cavity and an aeration pipe cavity, and a impeller disc, a first booster turbine and a second booster turbine which are rotatably installed in the interior of the fan drum box, the first air outlet cavity and the aeration pipe cavity respectively. In the application, the high-pressure oxygen increasing mechanism is arranged, the external airflow is pressurized and introduced by the fan drum box and the impeller disc, and the airflow is dispersed by the aeration pipe cavity and the diffusion panel, so that a large amount of airflow is introduced into the wastewater to increase the oxygen content of the water, and the wastewater is fully electrocatalytically oxidized by the electrolytic assembly, thereby avoiding the generation of toxic nitrogen oxide gas due to insufficient reaction and improving the safety.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of wastewater treatment, in particular to a device for electro-catalytic oxidation degradation of cyanide-containing wastewater. BACKGROUND

[0002] Cyanide (a compound containing a cyano group CN) is a highly toxic pollutant, which is commonly found in wastewater generated in the electroplating, dye, mining, metallurgy, petrochemical, coking and other industries. Direct discharge of cyanide-containing wastewater can cause great harm to aquatic organisms such as fish, destroy the ecology, and ultimately harm human health. Common methods for treating cyanide-containing wastewater at home and abroad include chlorination oxidation, electrochemical oxidation, ozone oxidation, sulfur dioxide-air method and the like. These methods have their own advantages and disadvantages, and have achieved certain effects in engineering.

[0003] The electro-catalytic oxidation method is as follows: the electro-catalytic oxidation method uses the high potential of the anode or the hydroxyl radicals generated by the anode reaction to oxidize and degrade the pollutants in the wastewater, so as to achieve removal. The cyanide-containing wastewater in the electrolytic cell is oxidized under alkaline conditions. CN - is easily electrochemically oxidized; in the oxidation reaction process, CN - is first oxidized to cyanate ions, and then the cyanate ions are hydrolyzed to generate ammonia and carbonate ions. At the same time, the cyanate ions can also continue to be oxidized to generate CO2 and N2. However, the existing electro-catalytic oxidation device cannot completely remove pollutants such as cyanide, COD and ammonia nitrogen due to the lack of any oxygen supplement structure.

[0004] Therefore, the existing problems are researched and improved, and the device for electro-catalytic oxidation degradation of cyanide-containing wastewater is provided to solve the existing problems, so as to solve the problems and improve the practical value. SUMMARY

[0005] The application aims to solve one of the technical problems in the prior art or related art.

[0006] To this end, the technical scheme adopted by the application is as follows: a device for electro-catalytic oxidation degradation of cyanide-containing wastewater, comprising: a wastewater electrolytic cell, a high-pressure oxygen increasing mechanism, a flow stirring mechanism and an electrolytic assembly, the flow stirring mechanism and the electrolytic assembly are fixedly installed in the interior of the wastewater electrolytic cell, the high-pressure oxygen increasing mechanism is fixedly installed on one side of the wastewater electrolytic cell and has one end located in the interior of the wastewater electrolytic cell, the high-pressure oxygen increasing mechanism comprises a fan drum box, a first gas outlet cavity and an aeration pipe cavity which are sequentially communicated, and impeller discs, first and second supercharging turbines which are rotatably installed in the interiors of the fan drum box, the first gas outlet cavity and the aeration pipe cavity, respectively, the bottom surface of the first gas outlet cavity is communicated with a scattering panel, and the other end of the aeration pipe cavity is fixedly connected with a plug flange.

[0007] The surface of the fan drum box is communicated with an air inlet filter cylinder located outside the wastewater electrolytic cell, one side of the fan drum box is fixedly installed with a driving motor, the output end of the driving motor is fixedly connected with a main shaft rotatably installed at the inner side of the plug flange, the impeller disc, the first booster turbine and the second booster turbine are fixedly sleeved on the surface of the main shaft, the other side of the fan drum box is fixedly connected with a secondary air outlet guide strip located inside the wastewater electrolytic cell, the flow stirring mechanism comprises a convection stirring frame and a plurality of vortex fan rotating drums fixedly installed at the inner side of the convection stirring frame, the surface of the convection stirring frame is provided with a binding frame for being fixed to the electrolytic assembly, the plurality of vortex fan rotating drums are uniformly distributed around the electrolytic assembly, the inner side of the vortex fan rotating drum is fixedly installed with a brushless motor, and the output end of the brushless motor is fixedly sleeved with a flow stirring fan blade.

[0008] In a preferred example, the electrolytic assembly is fixedly installed on the surface of the convection stirring frame, the bottom surface of the convection stirring frame is connected to the bottom surface through the binding frame, and a suspension interval is arranged between the bottom surface and the bottom surface of the convection stirring frame.

[0009] In a preferred example, the number of vortex fan rotating drums is eight, and the eight vortex fan rotating drums are evenly divided into two groups, one group of vortex fan rotating drums is fixedly installed on the top surface of the convection stirring frame and arranged in a vertical direction, and the other group of vortex fan rotating drums is fixedly installed on the inner side of the convection stirring frame, and four vortex fan rotating drums are arranged in perpendicular directions.

[0010] In a preferred example, the surface of the secondary air outlet guide strip and the surface of the aeration pipe cavity are each provided with a plurality of air outlet holes, the surface of the air outlet hole is provided with a one-way valve flap, the exposure panel comprises a base and an aeration diaphragm fixedly installed on the surface of the base, and the surface of the aeration diaphragm is provided with densely distributed micron-level aeration micropores.

[0011] In a preferred example, the impeller disc is disc-shaped and provided with a plurality of fan blades around the periphery, the connection end of the fan drum box and the first air outlet cavity is a conical cavity, the secondary air outlet guide strip is circular-arc-shaped and concentrically arranged with the first air outlet cavity and fixed to one side of the fan drum box.

[0012] In a preferred example, the first booster turbine and the second booster turbine have the same structure and each comprise a turbine disc and a spiral rotating blade fixedly installed inside the turbine disc.

[0013] In a preferred example, the electrolytic assembly comprises a fixed support frame, an electrode connecting rod and an electrode panel, the number of electrode panels is a plurality and is sequentially and intervally distributed between the fixed support frames, an insulating partition ring is fixedly installed between adjacent electrode panels, and the electrode connecting rod is fixedly installed on the top surface of the fixed support frame and electrically connected with the top end of the electrode panel.

[0014] The application can be further configured as follows in a preferred example: the electrode panel is a nickel-plated stainless steel plate structure, and the number of electrode connecting rods is two, and the top ends of the two adjacent electrode panels are respectively connected to the surfaces of the two electrode connecting rods.

[0015] The application has the following beneficial effects:

[0016] 1. In the application, the high-pressure oxygen-increasing mechanism structure is provided, the external airflow is pressurized and introduced by the fan drum box and the impeller disc, and the airflow is dispersed by the aeration pipe cavity and the aeration panel, so that a large amount of airflow is introduced into the wastewater to increase the oxygen content of the water, so that the wastewater is fully electrocatalytic oxidized by the electrolytic assembly, the generation of toxic nitrogen oxide gas caused by insufficient reaction is avoided, and the safety is improved.

[0017] 2. In the application, the multi-grid type electrolytic assembly structure is provided, the electrolytic assembly structure is combined by a plurality of electrode panels to increase the contact area with the wastewater, and the water near the electrolytic assembly is stirred to flow rapidly under the action of the flow stirring mechanism, so that the wastewater and the introduced gas rapidly contact the surface of the electrode panel, and the water on the surface of the electrode panel is renewed, thereby improving the electrocatalytic oxidation degradation efficiency.

[0018] 3. In the application, the airflow is dispersed and discharged by the aeration pipe cavity and the aeration panel, a large amount of airflow is pumped in under the action of the impeller disc and is output by the first and second booster turbines, the airflow conveying pressure is increased, the airflow is uniformly dispersed to the inside of the wastewater electrolytic cell through the surface of the aeration pipe cavity and the aeration panel, the oxygen solubility of the wastewater is improved, and the catalytic oxidation is more complete. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the application;

[0020] Figure 2 It is a schematic diagram of the high-pressure oxygen-increasing mechanism structure of an embodiment of the application;

[0021] Figure 3 It is a schematic diagram of the flow stirring mechanism and the electrolytic assembly structure of an embodiment of the application;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the high-pressure oxygen-increasing mechanism of an embodiment of the application;

[0023] Figure 5 It is a schematic diagram of the structure of the first and second booster turbines of an embodiment of the application;

[0024] Figure 6 It is a schematic diagram of the flow stirring mechanism structure of an embodiment of the application;

[0025] Figure 7 The structural schematic diagram of the electrolytic assembly for one embodiment of the present application.

[0026] Reference signs:

[0027] 100, wastewater electrolytic cell;

[0028] 200, high-pressure oxygen-increasing mechanism; 210, fan drum box; 220, first air outlet cavity; 230, aeration pipe cavity; 240, aeration and diffusion panel; 250, first turbocharger; 260, second turbocharger; 211, air inlet filter cartridge; 212, auxiliary air outlet guide strip; 213, driving motor; 214, impeller disc; 231, plug flange;

[0029] 300, flow stirring mechanism; 310, convection stirring frame; 320, turbofan rotating drum; 311, binding frame; 321, brushless motor; 322, flow stirring fan blade;

[0030] 400, electrolytic assembly; 410, fixed support frame; 420, electrode connecting rod; 430, electrode panel; 431, insulating spacer ring. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions and advantages of the present application clearer and more comprehensible, the present application is further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] Some embodiments of the present application provide an electro-catalytic oxidation degradation cyanide-containing wastewater device.

[0033] In combination with Figures 1-7 As shown in the drawings, the electro-catalytic oxidation degradation cyanide-containing wastewater device provided by the present application comprises a wastewater electrolytic cell 100, a high-pressure oxygen-increasing mechanism 200, a flow stirring mechanism 300 and an electrolytic assembly 400. The flow stirring mechanism 300 and the electrolytic assembly 400 are fixedly installed inside the wastewater electrolytic cell 100. The high-pressure oxygen-increasing mechanism 200 is fixedly installed on one side of the wastewater electrolytic cell 100 and has one end located inside the wastewater electrolytic cell 100. The high-pressure oxygen-increasing mechanism 200 comprises a fan drum box 210, a first air outlet cavity 220 and an aeration pipe cavity 230 which are sequentially communicated, and an impeller disc 214, a first turbocharger 250 and a second turbocharger 260 which are respectively rotatably installed inside the fan drum box 210, the first air outlet cavity 220 and the aeration pipe cavity 230. The bottom surface of the first air outlet cavity 220 is communicated with an aeration and diffusion panel 240. The other end of the aeration pipe cavity 230 is fixedly connected with a plug flange 231.

[0034] The surface of the fan drum box 210 is communicated with the air inlet filter cylinder 211 located outside the wastewater electrolytic cell 100, one side of the fan drum box 210 is fixedly installed with a driving motor 213, the output end of the driving motor 213 is fixedly connected with a main shaft rotatably installed at the inner side of the plug flange 231, the impeller disc 214, the first booster turbine 250 and the second booster turbine 260 are fixedly sleeved on the surface of the main shaft, the other side of the fan drum box 210 is fixedly connected with the auxiliary air outlet guide strip 212 located inside the wastewater electrolytic cell 100, the flow stirring mechanism 300 includes a convection stirring frame 310 and a plurality of vortex fan rotating drums 320 fixedly installed at the inner side of the convection stirring frame 310, the surface of the convection stirring frame 310 is provided with a binding frame 311 for being fixed to the electrolytic assembly 400, the plurality of vortex fan rotating drums 320 are uniformly distributed around the electrolytic assembly 400, the inner side of the vortex fan rotating drum 320 is fixedly installed with a brushless motor 321 and the output end of the brushless motor 321 is fixedly sleeved with a flow stirring fan blade 322.

[0035] In this embodiment, the electrolytic assembly 400 is fixedly installed on the surface of the convection stirring frame 310 and connected to the bottom surface, and the bottom surface of the convection stirring frame 310 is provided with a suspension interval, the flow stirring mechanism 300 and the electrolytic assembly 400 are located directly above the exposure and dispersion panel 240.

[0036] Specifically, the electrolytic assembly 400 is suspended and fixed above the exposure and dispersion panel 240 by the convection stirring frame 310, and in the exposure and dispersion oxygen enrichment process of the exposure and dispersion panel 240, the oxygen content of the water around the electrolytic assembly 400 is improved, thereby improving the oxidation effect.

[0037] In this embodiment, the number of vortex fan rotating drums 320 is eight and is divided into two groups, one group of vortex fan rotating drums 320 is fixedly installed on the top surface of the convection stirring frame 310 and arranged in a vertical direction, and the other group of vortex fan rotating drums 320 is fixedly installed at the inner side of the convection stirring frame 310 and four vortex fan rotating drums 320 are arranged in a perpendicular direction to each other.

[0038] Specifically, the four vortex fan rotating drums 320 on the top surface realize downward pushing of the water and bubbles inside the wastewater electrolytic cell 100, realize up-down convection of the water, and realize certain suppression of the upward movement of the airflow, thereby improving the contact and dissolution efficiency of the airflow and the water.

[0039] In this embodiment, the surface of the auxiliary air outlet guide strip 212 and the air exposure tube cavity 230 is provided with a plurality of air outlet holes, the surface of the air outlet hole is provided with a one-way valve flap, the exposure and dispersion panel 240 includes a base and an air exposure diaphragm fixedly installed on the surface of the base, and the surface of the air exposure diaphragm is provided with densely distributed micron-level air exposure micro-holes.

[0040] Specifically, the auxiliary air outlet guide strip 212 and the surface air outlet holes of the aeration pipe cavity 230 form a large number of bubbles, which is beneficial to stir the wastewater in the wastewater electrolysis cell 100. The surface check valve effectively prevents the water from flowing in the wrong direction. Under the action of the diffusion panel 240, the gas flow escapes through the micron-level holes on the surface of the aeration diaphragm, dispersing into fine bubbles and improving the gas flow dissolution efficiency.

[0041] In this embodiment, the impeller disc 214 is disc-shaped and has a plurality of fan blades arranged on the outer periphery. The connection end of the fan drum 210 and the first air outlet cavity 220 is a conical cavity. The auxiliary air outlet guide strip 212 is arc-shaped and concentrically arranged with the first air outlet cavity 220 and fixed to one side of the fan drum 210.

[0042] Specifically, more fan blade structures are arranged on the large disc-shaped impeller disc 214 to input a large flow of gas. The auxiliary air outlet guide strip 212 guides the gas flow at the edge of the first air outlet cavity 220 to avoid turbulence of the outer ring gas flow in the fan drum 210, which affects the gas flow output efficiency.

[0043] In this embodiment, the first booster turbine 250 and the second booster turbine 260 have the same structure and each include a turbine disc and a spiral turning vane fixedly installed inside the turbine disc.

[0044] Specifically, the spiral turning vane pushes the gas flow horizontally along the surface of the main shaft, and the rotation of the turbine disc realizes the centrifugal discharge of the gas flow, which is transported into the diffusion panel 240 or discharged through the surface air holes of the aeration pipe cavity 230, realizes gas flow motion compensation, and improves the gas flow transport pressure.

[0045] In this embodiment, the electrolysis assembly 400 includes a fixed support frame 410, an electrode connecting rod 420, and a plurality of electrode panels 430. The electrode panels 430 are spaced apart and arranged between the fixed support frames 410. Insulating spacers 431 are fixedly installed between adjacent electrode panels 430. The electrode connecting rod 420 is fixedly installed on the top surface of the fixed support frame 410 and electrically connected to the top end of the electrode panel 430.

[0046] Further, the electrode panel 430 is a nickel-plated stainless steel plate structure, and the number of electrode connecting rods 420 is two. The top ends of the adjacent two electrode panels 430 are respectively connected to the surfaces of the two electrode connecting rods 420.

[0047] Specifically, the grid plate type electrolysis assembly 400 has the characteristics of simple and reasonable structure and good use effect. Due to the large specific surface area and high electrochemical reaction activity, the power generation catalytic efficiency is significantly improved. Users can select the thickness of the insulating spacer 431 to change the spacing between the adjacent electrode panels 430 according to the strength of the electrode effect, which improves the flexibility of the electrode use.

[0048] The working principle and use process of the present application are as follows:

[0049] In the working of the device for electro-catalytic oxidation degradation of cyanide-containing wastewater, the impeller disc 214, the first booster turbine 250 and the second booster turbine 260 are driven by the driving motor 213 to rotate inside the fan drum box 210, the first gas outlet cavity 220 and the aeration pipe cavity 230. A large amount of gas flow is introduced into the inside of the fan drum box 210 through the air inlet filter cylinder 211 under the rotation of the impeller disc 214. Part of the gas flow is directly dispersed into the inside of the wastewater electrolytic cell 100 through the auxiliary gas outlet guide strip 212. A part of the gas flow is centrifugally output to the dispersion panel 240 through the rotation of the first booster turbine 250. The gas flow is dispersed to the lower part of the flow stirring mechanism 300 and the electrolytic assembly 400 through the dispersion panel 240, dissolved into the water liquid, and the oxygen dissolution rate in the water liquid is improved. Another part of the gas flow is dispersed on the surface of the aeration pipe cavity 230 and output to the inside of the wastewater electrolytic cell 100 through the rotation of the second booster turbine 260. The gas flow is dispersed by the aeration pipe cavity 230 and the dispersion panel 240, a large amount of gas flow is introduced into the wastewater to improve the oxygen content in the water liquid, so that the wastewater is fully electro-catalytically oxidized by the electrolytic assembly 400, and the generation of toxic nitrogen oxide gas due to insufficient reaction is avoided.

[0050] In the working of the electrolytic assembly 400, the electric current is introduced into the water liquid through the electrode panel 430. Under the electro-catalytic oxidation, the CN - is first oxidized into cyanate ions, and then the cyanate ions are hydrolyzed to generate ammonia and carbonate ions. At the same time, the cyanate ions can also continue to be oxidized to generate CO2 and N2. Under the working of the turbofan rotating drum 320, the stirred water liquid makes the water liquid near the electrode panel 430 move rapidly in a countercurrent manner, so that the wastewater and the introduced gas rapidly contact the surface of the electrode panel 430, carry away the generated CO2 and N2, and update the water liquid in contact with the surface of the electrode panel 430, so that the wastewater continuously contacts the surface of the electrode panel 430, thereby improving the electro-catalytic oxidation degradation efficiency.

[0051] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A device for electrocatalytic oxidation degradation of cyanide-containing wastewater, characterized in that, include: The wastewater electrolysis cell (100), high-pressure aeration mechanism (200), agitation mechanism (300), and electrolysis assembly (400) are provided. The agitation mechanism (300) and electrolysis assembly (400) are fixedly installed inside the wastewater electrolysis cell (100). The high-pressure aeration mechanism (200) is fixedly installed on one side of the wastewater electrolysis cell (100), with one end located inside the wastewater electrolysis cell (100). The high-pressure aeration mechanism (200) includes a blower drum box connected in sequence. 210), a first air outlet chamber (220) and an aeration pipe chamber (230), and an impeller disk (214), a first booster turbine (250) and a second booster turbine (260) respectively rotatably installed inside the blower drum (210), the first air outlet chamber (220) and the aeration pipe chamber (230), the bottom surface of the first air outlet chamber (220) is connected to an aeration panel (240), and the other end of the aeration pipe chamber (230) is fixedly connected to a plug flange (231); The surface of the blower drum (210) is connected to an air inlet filter (211) located outside the wastewater electrolysis cell (100). A drive motor (213) is fixedly installed on one side of the blower drum (210). The output end of the drive motor (213) is fixedly connected to a main shaft whose other end is rotatably installed inside the plug flange (231). The impeller disk (214), the first booster turbine (250), and the second booster turbine (260) are fixedly sleeved on the surface of the main shaft. The other side of the blower drum (210) is fixedly connected to an air inlet filter (211) located inside the wastewater electrolysis cell (100). The auxiliary exhaust guide bar (212) and the agitation mechanism (300) include a convection agitator (310) and a plurality of turbofan drums (320) fixedly installed inside the convection agitator (310). The surface of the convection agitator (310) is provided with a binding (311) for fixing to the electrolysis component (400). The plurality of turbofan drums (320) are evenly distributed around the electrolysis component (400). A brushless motor (321) is fixedly installed inside the turbofan drum (320) and the output end of the brushless motor (321) is fixedly sleeved with agitator blades (322). The electrolysis component (400) is fixedly installed on the surface of the convection stirrer (310) and is connected to the bottom surface of the convection stirrer (310) by a binding (311) with a suspension gap. The stirring mechanism (300) and the electrolysis component (400) are located directly above the exposure panel (240). The surfaces of the auxiliary air outlet guide strip (212) and the aeration tube (230) are provided with a number of air outlet holes, and the surfaces of the air outlet holes are provided with one-way valve flaps. The aeration panel (240) includes a base and an aeration membrane fixedly installed on the surface of the base.

2. The electrocatalytic oxidation device for degrading cyanide-containing wastewater according to claim 1, characterized in that, The number of the turbofan drums (320) is eight and they are divided into two groups. One group of turbofan drums (320) is fixedly installed on the top surface of the convection stirrer (310) and arranged in a vertical direction. The other group of turbofan drums (320) is fixedly installed on the inner side of the convection stirrer (310) and the arrangement directions of the four turbofan drums (320) are perpendicular to each other.

3. The electrocatalytic oxidation device for degrading cyanide-containing wastewater according to claim 1, characterized in that, The surface of the aeration membrane is provided with densely distributed micron-sized aeration micropores.

4. The electrocatalytic oxidation device for degrading cyanide-containing wastewater according to claim 1, characterized in that, The impeller disk (214) is disc-shaped and has several fan blades on its outer periphery. The connection end between the fan drum box (210) and the first air outlet chamber (220) is a conical cavity. The auxiliary air outlet guide bar (212) is arc-shaped and is arranged concentrically with the first air outlet chamber (220) and fixed on one side of the fan drum box (210).

5. The electrocatalytic oxidation device for degrading cyanide-containing wastewater according to claim 1, characterized in that, The first turbocharger (250) and the second turbocharger (260) have the same structure, both consisting of a turbine disk and a helical blade fixedly installed inside the turbine disk.

6. The electrocatalytic oxidation device for degrading cyanide-containing wastewater according to claim 1, characterized in that, The electrolysis assembly (400) includes a fixed holder (410), an electrode connecting rod (420), and an electrode panel (430). The number of electrode panels (430) is several and they are distributed sequentially and spaced apart between the fixed holder (410). An insulating spacer (431) is fixedly installed between adjacent electrode panels (430). The electrode connecting rod (420) is fixedly installed on the top surface of the fixed holder (410) and electrically connected to the top of the electrode panel (430).

7. The electrocatalytic oxidation device for degrading cyanide-containing wastewater according to claim 6, characterized in that, The electrode panel (430) is a nickel-plated stainless steel plate structure, and there are two electrode connecting rods (420). The top ends of two adjacent electrode panels (430) are respectively connected to the surfaces of the two electrode connecting rods (420).

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