Cyclic-driven photo-Fenton filtering device

Abstract

The utility model discloses a circularly-driven photo-Fenton filtering device which comprises a booster pump arranged in a sewage pool and used for driving sewage to circularly flow; one end of the pipeline is connected with the water outlet of the booster pump, and the other end is connected with sewage to form a circulation loop; the multi-stage photo-Fenton filtering membranes are distributed at intervals along the axial direction of the pipeline; the reaction liquid storage tank is arranged outside the pipeline; the plurality of one-way liquid inlet valves are distributed on the pipe wall of the pipeline between the adjacent photo-Fenton filter membranes at intervals and are communicated with the reaction liquid storage tank and the inner cavity of the pipeline through sub-channels; the lamplight unit is arranged outside the pipeline and corresponds to the light-transmitting area of the pipeline, and light rays act on the multi-stage light Fenton filtering membrane through the light-transmitting area. Sewage is driven by the booster pump to circularly flow in the pipeline, and hydrogen peroxide reaction liquid in the reaction liquid storage tank is sucked from the one-way liquid inlet valve by utilizing fluid pressure difference and is supplemented in stages, so that continuous free radical supply of photo-Fenton reaction is realized, and the industrial sewage treatment efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a circulating-driven photo-Fenton filtration device. Background Technology

[0002] In the field of water purification, photo-Fenton filtration membranes with filtration and photocatalytic functions have been developed and utilized. Please refer to: Fang Haohang et al., Flexible bifunctional wood-derived water filtration / photo-Fenton membrane for efficient purification of mixed organic wastewater, Colloids and Surfaces A: Physicochemical and Engineering Aspects 697 (2024)134498. This paper describes a wood-based photocatalytic membrane prepared by fixing a photo-Fenton catalyst onto a flexible wood membrane. In wastewater treatment, a certain amount of hydrogen peroxide is added to the wastewater solution. The wood-based photocatalytic membrane material loaded with the photo-Fenton catalyst is used as a filter membrane for continuous filtration of the wastewater. During filtration, the photo-Fenton catalyst generates photocharges under light irradiation. Electrons and ferrous ions react with hydrogen peroxide to generate free radicals such as •OH. These free radicals, together with photogenerated holes, degrade the mixed organic pollutants into carbon dioxide and water, thus achieving wastewater purification. In actual industrial wastewater treatment processes, insufficient supply of free radicals or inadequate reaction time in the photo-Fenton reaction can lead to poor wastewater treatment efficiency. Utility Model Content

[0003] To address the aforementioned problems, one objective of this invention is to provide a circulating-driven photo-Fenton filtration device to solve the technical problem of poor wastewater treatment efficiency of photo-Fenton filtration membranes in practical applications.

[0004] To achieve these objectives and other advantages of this invention, this invention provides a cyclically driven photo-Fenton filter device, comprising:

[0005] A booster pump, placed in the sewage tank, is used to drive the circulation of sewage.

[0006] The pipeline connects one end to the outlet of the booster pump and the other end to the sewage, forming a circulation loop.

[0007] Multi-stage photo-Fenton filter membranes are distributed at intervals along the axial direction of the pipeline;

[0008] The reaction solution storage tank is located outside the pipeline;

[0009] Several one-way liquid inlet valves are spaced apart on the pipe wall between adjacent photo-Fenton filter membranes, and connect the reaction liquid storage tank and the inner cavity of the pipe through sub-channels;

[0010] The lighting unit is located outside the pipe and corresponds to the light-transmitting area of ​​the pipe. The light passes through the light-transmitting area and acts on the multi-stage photo-Fenton filter membrane.

[0011] This embodiment uses a booster pump to drive the sewage to circulate in the pipeline, and uses the fluid pressure difference to draw hydrogen peroxide reaction solution from the reaction solution storage tank through a one-way inlet valve to replenish it in stages, thereby achieving a continuous supply of free radicals for the photo-Fenton reaction and improving sewage treatment efficiency.

[0012] Preferably, the pipeline has a stepped structure section that rises, which is composed of several horizontal and inclined sections connected alternately. A one-way inlet valve is set on the inclined section, and the hydrogen peroxide reaction solution enters the pipeline through the one-way inlet valve. The turbulence created by the inclined section enhances the mixing of the reaction solution and the sewage.

[0013] The stepped structure design of the pipe in the above-described embodiment can cause the sewage to generate vortices due to sudden changes in flow direction, which promotes the full mixing of hydrogen peroxide and other reaction liquids with pollutants after they are injected through the valve.

[0014] Preferably, the tilt angle of the inclined segment is 60°~80°.

[0015] Preferably, the one-way liquid inlet valve is located in the upper middle part of the inclined section, which utilizes the dual effects of gravity and pressure difference to promote the diffusion of the reaction liquid, while also allowing for a certain period of mixing time.

[0016] Preferably, the upper part of the inclined section has a tapered section to increase the flow rate, and a one-way inlet valve is set at the tapered section to enhance the automatic intake of hydrogen peroxide reaction solution by the fluid pressure difference.

[0017] Preferably, stainless steel spiral guide vanes are welded to the inner wall of each horizontal section of the stepped pipe section, with the height of the guide vanes being 1 / 5 to 1 / 3 of the pipe diameter. During operation, the sewage flows through the horizontal section and is swirled by the spiral guide vanes, causing the hydrogen peroxide reaction solution and pollutants to mix thoroughly under the swirling action, before passing through the photo-Fenton filter membrane.

[0018] Preferably, the one-way inlet valve is a one-way pressure-sensitive diaphragm one-way inlet valve. The valve opening pressure can be set to 0.08 MPa.

[0019] Preferably, the pipe is provided with a transparent window to provide a light-transmitting area.

[0020] Preferably, the transparent window is located at the junction of the inclined segment and the horizontal segment.

[0021] Preferably, the lighting unit is mounted on a transparent window.

[0022] Preferably, since the photo-Fenton filter membrane is relatively flexible, a grid support structure is provided for support, which also facilitates replacement.

[0023] Specifically, the pipe is equipped with a detachable mesh support structure, which includes:

[0024] An annular groove is set on the inner wall of the pipe, with a groove depth of 2~3mm;

[0025] The frame, in conjunction with the annular slot, has an internal space for accommodating the photo-Fenton filter membrane;

[0026] The support mesh, fixed to one end of the frame, supports and accommodates the photo-Fenton filter membrane. The porosity of the support mesh is over 80%.

[0027] Preferably, the photo-Fenton filter membrane is bonded and fixed to the water-facing surface of the support mesh, and the membrane-mesh spacing is ≤0.5mm.

[0028] Preferably, the photo-Fenton filtration membrane is the wood-based photocatalytic membrane disclosed in Fang Haohang et al., Flexible bifunctional wood-derivedwater filtration / photo-Fenton membrane for efficient purification of mixed organic wastewater, Colloids and Surfaces A: Physicochemical and Engineering Aspects 697 (2024) 134498.

[0029] This utility model has at least the following beneficial effects:

[0030] This invention uses a booster pump to drive sewage to circulate in a pipeline, and uses the fluid pressure difference to draw hydrogen peroxide reaction solution from the reaction solution storage tank through a one-way inlet valve for phased replenishment, thereby achieving a continuous supply of free radicals for the photo-Fenton reaction, improving sewage treatment efficiency, and solving the technical problem of poor sewage treatment efficiency when the photo-Fenton reaction system is used in larger sewage treatment equipment such as sewage tanks and sewage pools.

[0031] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the cyclically driven optical Fenton filter device of this utility model.

[0033] Figure 2This is a schematic diagram of the horizontal and inclined sections of the pipe of this utility model;

[0034] Figure 3 This is a schematic diagram of the grid support structure of this utility model.

[0035] The components include: a booster pump 10; a pipe 20; a horizontal section 201; an inclined section 202; a second end of the pipe 203; a photo-Fenton filter membrane 30; a frame 301; an annular groove 302; a support net 303; a mesh 304; a accommodating space 305; a rubber layer 306; a reaction liquid storage tank 40; a one-way liquid inlet valve 50; a lighting unit 60; a transparent window 70; a sewage tank 80; and a guide plate 90. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0037] As shown in Figures 1-3, the present invention provides a cyclically driven photo-Fenton filter device, comprising:

[0038] The booster pump 10 is placed in the sewage source such as the sewage tank 80 or sewage tank, and is used to drive the sewage to circulate along the pipeline 20; preferably, a coarse filtration structure such as a filter screen can be added to the outside of the booster pump 10.

[0039] Pipe 20 has one end connected to the outlet of booster pump 10 and the other end connected to sewage, forming a circulation loop. In the illustration, the first end of the pipe is connected to booster pump 10, and the second end 203 is connected back to sewage tank 80. Pipe 20 can be a plastic pipe or a metal pipe, preferably a transparent plastic pipe, which can provide illumination for the multi-stage photo-Fenton filter membrane 30. Non-transparent pipes can provide illumination by installing transparent windows.

[0040] The multi-stage optical Fenton filter membrane 30 is distributed along the axial direction of the pipe 20 at a certain spacing; the spacing can be set according to actual needs, and can be equal spacing or non-equal spacing.

[0041] The reaction liquid storage tank 40 is located outside the pipe 20; preferably, it is located at a higher position than the pipe 20, so that the reaction liquid can flow into the pipe 20 by gravity. The reaction liquid storage tank 40 mainly contains reaction liquids such as hydrogen peroxide.

[0042] Several one-way inlet valves 50 are spaced apart on the pipe wall of the pipe 20 between adjacent photo-Fenton filter membranes 30. They connect the reaction liquid storage tank 40 and the inner cavity of the pipe 20 through sub-channels. Under the action of gravity, the reaction liquid automatically flows into the pipe 20 through the one-way valves and mixes and reacts fully with the sewage.

[0043] The lighting unit 60 is located outside the pipe 20 and corresponds to the light-transmitting area of ​​the pipe 20. Light passes through the light-transmitting area and acts on the multi-stage optical Fenton filter membrane 30. When the pipe 20 is a transparent pipe, the entire pipe 20 is a light-transmitting area, and the lighting unit 60 can be placed outside the pipe 20 corresponding to the filter membrane. When the pipe 20 is not transparent, a light-transmitting area can be set, and the lighting unit 60 is placed in the light-transmitting area.

[0044] In one implementation of this method, the booster pump 10 is started to pump the sewage in the sewage tank 80 into the pipe 20. The sewage flows along the pipe 20, and the reaction liquid in the reaction liquid storage tank 40 flows in through the one-way inlet valve 50 to mix with the sewage. It then passes through the photo-Fenton filter membrane 30 to generate a photo-Fenton catalytic reaction. The pollutants in the sewage are catalytically decomposed, achieving step-by-step purification. Finally, it returns to the sewage tank 80 through the pipe 20. This cycle is repeated to achieve the purpose of cyclically driven filtration and purification.

[0045] In this embodiment, the booster pump 10 drives the sewage to circulate in the pipeline 20, and the hydrogen peroxide reaction solution in the reaction solution storage tank 40 is drawn in through the one-way inlet valve 50 and replenished in stages, so as to realize the continuous supply of free radicals for the photo-Fenton reaction and improve the sewage treatment efficiency.

[0046] Furthermore, in another embodiment, the pipe 20 has a stepped structure, which is composed of several horizontal sections 201 and inclined sections 202 connected alternately. A one-way inlet valve 50 is installed on the inclined section 202. The hydrogen peroxide reaction solution enters the pipe 20 through the one-way inlet valve 50. The turbulence created by the inclined section 202 enhances the mixing of the reaction solution and the wastewater. The illustration shows three sets of horizontal sections 201 and inclined sections 202 as an example. In actual applications, these can be set up as needed.

[0047] The stepped structure design of the pipe 20 in this embodiment can cause the sewage to generate vortices due to sudden changes in flow direction, which can cause the reaction liquid such as hydrogen peroxide to be injected through the valve and fully mix with the pollutants.

[0048] Furthermore, in another embodiment, the tilt angle of the inclined section 202 is 60°~80°, which gives the sewage a certain climbing resistance and promotes the formation of turbulence, thereby increasing the reaction time and effect between the reaction liquid and the sewage.

[0049] Furthermore, in another embodiment, the reaction liquid storage tank 40 can be open or closed. When open, the reaction liquid storage tank 40 is at atmospheric pressure, and the sewage in the pipe 20 is flowing. According to Bernoulli's principle, the pressure in the pipe 20 is low, forming a pressure difference with the reaction liquid storage tank 40. When closed, the air pressure in the reaction liquid storage tank 40 can be maintained at atmospheric pressure or slightly higher than atmospheric pressure by an air pump or a one-way air valve, so that the reaction liquid can enter the pipe 20 based on the pressure difference.

[0050] Furthermore, in another embodiment, the upper middle part of the inclined section 202 has a tapered section to increase the flow rate, and a one-way inlet valve 50 is provided at the tapered section to enhance the automatic intake of hydrogen peroxide reaction solution by the fluid pressure difference.

[0051] Furthermore, in another embodiment, the one-way liquid inlet valve 50 is located in the upper middle part of the inclined section 202, and uses the dual action of gravity and pressure difference to promote the diffusion of the reaction liquid, while having a certain distance of flow mixing time.

[0052] Furthermore, in another embodiment, a guide vane is also included. In the illustration, stainless steel spiral guide vanes 90 are welded to the inner wall of the bottom of each horizontal section 201 of the stepped pipe section. The height of the guide vane 90 is 1 / 5 to 1 / 3 of the pipe diameter. During operation, when the sewage flows through the horizontal section 201, it is swirled by the spiral guide vane 90, which allows the hydrogen peroxide reaction solution and pollutants to be fully mixed under the action of the swirling flow, and then passes through the photo-Fenton filter membrane 30.

[0053] Furthermore, in another embodiment, the one-way inlet valve 50 is a one-way pressure-sensitive diaphragm one-way inlet valve. The valve opening pressure can be set to 0.08 MPa. The one-way pressure-sensitive diaphragm one-way inlet valve mainly relies on the pressure difference on both sides of the diaphragm to achieve opening and closing. In this embodiment, the reaction liquid storage tank 40 is positioned higher than the pipe 20. The reaction liquid exerts pressure on one side of the diaphragm due to gravity. When this pressure reaches or exceeds the set opening pressure (0.08 MPa), the diaphragm undergoes elastic deformation, thereby opening the valve passage and allowing the reaction liquid to flow into the pipe 20 and mix with the sewage. When the sewage pressure in the pipe 20 is greater than the reaction liquid pressure, the diaphragm returns to its original shape, tightly fitting the valve seat and preventing sewage from flowing back into the reaction liquid storage tank 40.

[0054] Furthermore, in another embodiment, a transparent window 70 is provided on the conduit 20 to provide a light-transmitting area. In the illustration, the transparent window 70 is located at the top of the horizontal section 201, near the optical Fenton filter membrane 30.

[0055] Furthermore, in another embodiment, the lighting unit 60 is disposed on the transparent window 70, and the light from the lighting unit 60 shines through the transparent window 70 onto the photo-Fenton filter membrane 30. The lighting unit 60 can be a UV LED strip light source, which is easy to replace.

[0056] Furthermore, in another embodiment, since the photo-Fenton filter membrane 30 is relatively flexible, a mesh support structure is provided for support, which also facilitates replacement. Specifically, the pipe 20 is provided with a detachable mesh support structure, which includes:

[0057] An annular groove 302 is provided on the inner wall of pipe 20, with a groove depth of 2~3mm;

[0058] The frame 301 cooperates with the annular slot 302 and has an internal accommodating space 305 for the optical Fenton filter membrane 30;

[0059] A support mesh 303 is fixed to one end face of the frame 301 to support and accommodate the optical Fenton filter membrane 30. The support mesh 303 has mesh openings 304 and a porosity of over 80%.

[0060] The photo-Fenton filter membrane 30 is bonded and fixed to the water-facing surface of the support mesh 303, with a membrane-mesh spacing of ≤0.5mm.

[0061] Preferably, in order to improve the tightness of the connection between the frame 301 and the card slot, an elastic rubber layer 306 is provided on the outer wall of the frame 301.

[0062] Furthermore, in another embodiment, the photo-Fenton filter membrane 30 is the wood-based photocatalytic membrane disclosed by Fang Haohang et al., Flexible bifunctional wood-derived waterfiltration / photo-Fenton membrane for efficient purification of mixed organic wastewater, Colloids and Surfaces A: Physicochemical and Engineering Aspects 697 (2024) 134498.

[0063] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be easily made by those skilled in the art.

Claims

1. A cyclically driven photo-Fenton filter device, characterized in that, include: A booster pump, placed in the sewage tank, is used to drive the circulation of sewage. The pipeline connects one end to the outlet of the booster pump and the other end to the sewage, forming a circulation loop. Multi-stage photo-Fenton filter membranes are distributed at intervals along the axial direction of the pipeline; The reaction solution storage tank is located outside the pipeline; Several one-way liquid inlet valves are spaced apart on the pipe wall between adjacent photo-Fenton filter membranes, and connect the reaction liquid storage tank and the inner cavity of the pipe through sub-channels; The lighting unit is located outside the pipe and corresponds to the light-transmitting area of ​​the pipe. The light passes through the light-transmitting area and acts on the multi-stage photo-Fenton filter membrane.

2. The cyclically driven photo-Fenton filter device as described in claim 1, characterized in that, The pipeline has a stepped structure, which consists of several horizontal and inclined sections connected alternately. A one-way inlet valve is installed on the inclined section.

3. The cyclically driven photo-Fenton filter device as described in claim 2, characterized in that, The upper and middle sections of the inclined section have a tapered section to increase the flow rate, and a one-way inlet valve is located at the tapered section.

4. The cyclically driven photo-Fenton filter device as described in claim 2, characterized in that, Stainless steel spiral guide vanes are welded to the inner wall of each horizontal section of the stepped pipe section, with the height of the guide vanes being 1 / 5 to 1 / 3 of the pipe diameter.

5. The cyclically driven photo-Fenton filter device as described in claim 1, characterized in that, The one-way inlet valve is a one-way pressure-sensitive diaphragm one-way inlet valve.

6. The cyclically driven photo-Fenton filter as described in claim 1, characterized in that, The pipe has a transparent window to provide a light-transmitting area; the lighting unit is set on the transparent window.

7. The cyclically driven photo-Fenton filter as described in claim 1, characterized in that, A grid support structure is set up to support the optical Fenton filter membrane, including: An annular groove is set on the inner wall of the pipe, with a groove depth of 2~3mm; The frame, in conjunction with the annular slot, has an internal space for accommodating the photo-Fenton filter membrane; The support mesh, fixed to one end of the frame, supports and accommodates the photo-Fenton filter membrane. The porosity of the support mesh is over 80%.

8. The cyclically driven photo-Fenton filter device as described in claim 7, characterized in that, The photo-Fenton filter membrane is bonded and fixed to the water-facing surface of the support mesh, with a membrane-mesh spacing of ≤0.5mm.

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