Electro-Fenton sludge conditioning reactor

Abstract

The electro-Fenton sludge conditioning reactor comprises a tank body, an electrode unit and a stirring mechanism, the tank body is provided with a reaction cavity, the reaction cavity is used for containing sludge, and a mounting opening communicated with the reaction cavity is formed in one side wall of the tank body; the electrode unit comprises an anode plate, a cathode plate and a power supply, the anode plate is arranged in the reaction cavity and is detachably and fixedly connected with the tank body, and the cathode plate is propped against an orifice of the mounting opening. The electro-Fenton sludge conditioning reactor disclosed by the utility model has the beneficial effects that the electro-Fenton sludge conditioning reactor is used for treating sludge, an aeration system does not need to be used for aerating the cathode, and the cathode sheet can directly capture oxygen from air to generate hydrogen peroxide in situ, so that the reaction is effectively carried out, the aeration system is prevented from being used for aerating the sludge, and the cost is reduced. The sludge blocks the outlet end of the aeration system, so that the aeration system cannot perform normal aeration.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment, in particular to an electro-Fenton sludge conditioning reactor. Background Art

[0002] Sludge dewatering is an indispensable step in the sludge treatment and disposal process. With the acceleration of my country's urbanization process and the improvement of environmental protection requirements, the reduction, stabilization and harmless treatment of sludge have become particularly important. Sludge dewatering technology can effectively reduce the moisture content and volume of sludge, providing convenient conditions for subsequent sludge disposal, such as landfill, incineration, and land utilization. It plays an important role in achieving the final safe disposal and resource utilization of sludge. Therefore, it is very necessary to study efficient, feasible and economical sludge dewatering methods.

[0003] The chemical Fenton method is to add Fe 2+ The electro-Fenton process generates H2O2 in situ through electrochemical means while continuously generating Fe2O2 between the cathode and anode. 2+ , which in turn generates hydroxyl radicals (·OH). Existing electro-Fenton reactors (such as the moving bed biofilm reactor-coordinated electro-Fenton wastewater treatment system disclosed in Application No. 202320536866.9) require continuous exposure of the cathode to air or oxygen during the electrochemical reaction to ensure the reaction proceeds. However, aeration of the sludge can easily clog the outlet of the aeration system, preventing it from aerating properly. This can slow down the H2O2 production process, or even prevent H2O2 production, increasing the cost of the equipment and energy consumption. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned technical deficiencies and propose an electro-Fenton sludge conditioning reactor to solve the technical problem that in the process of treating sludge by the electro-Fenton method in the prior art, it is necessary to aerate the sludge, and the sludge easily blocks the outlet end of the aeration system, resulting in the aeration system being unable to aerate normally.

[0005] In order to achieve the above technical objectives, the technical solution of the utility model provides an electro-Fenton sludge conditioning reactor, comprising:

[0006] The tank body has a reaction chamber for containing sludge, and a mounting port communicating with the reaction chamber is opened on one side wall of the tank body;

[0007] an electrode unit comprising an anode sheet, a cathode sheet, and a power supply, wherein the anode sheet is disposed in the reaction chamber and is detachably fixed to the tank body, the cathode sheet abuts against the opening of the mounting port and is detachably sealed and fixed to the tank body, and the power supply is electrically connected to both the anode sheet and the cathode sheet;

[0008] The stirring mechanism is used to stir the sludge in the reaction chamber.

[0009] Furthermore, two opposite walls of the reaction chamber are each provided with a slot extending in a vertical direction, and both sides of the anode plate are respectively clamped in the corresponding slot.

[0010] Furthermore, the cathode plate and the anode plate are parallel to each other.

[0011] Furthermore, the cathode plate is arranged outside the tank body.

[0012] Furthermore, the electro-Fenton sludge conditioning reactor further includes a fixing unit, which is detachably fixed to the tank body and is used to press the cathode plate against the outer wall of the tank body.

[0013] Furthermore, the fixing unit includes a fixing plate and a plurality of fasteners, the fixing plate is provided with a first flow opening, and each of the fasteners is used to detachably fix the fixing plate to the trough body, so that the two sides of the cathode plate are respectively pressed against the trough body and the fixing plate, and the first flow opening and the mounting opening correspond to each other.

[0014] Furthermore, the fixing unit also includes a sealing gasket, which has a deformable structure and is provided with a second flow opening. The sealing gasket is arranged on the inner side of the fixing plate and is used to press against the cathode plate. The second flow opening corresponds to the first flow opening.

[0015] Furthermore, the sealing gasket is made of rubber.

[0016] Furthermore, the trough body is provided with a plurality of first mounting holes that all pass through the trough body, the fixing plate is provided with a plurality of second mounting holes, and the sealing gasket is provided with a plurality of third mounting holes. Each of the fasteners includes a screw and two nuts. The screw passes through the first mounting hole, the second mounting hole and the third mounting hole. The two ends of the two nuts are respectively screwed to the two ends of the screw and respectively abut against the trough body and the fixing plate.

[0017] Furthermore, the stirring mechanism includes a rotating shaft, multiple stirring paddles and a rotating drive member. The rotating shaft is vertically arranged in the tank body. Each stirring paddle is fixed on the rotating shaft at intervals along the length direction of the rotating shaft. The blades of the upper and lower adjacent stirring paddles have opposite directions. The output end of the rotating drive member is fixedly connected to the upper end of the rotating shaft for driving the rotating shaft to rotate.

[0018] Compared with the prior art, the beneficial effects of the present invention include: when in use, the power supply supplies power to the anode and cathode sheets, and Fe is added to the reaction chamber. 2+ Reagent, since the outer side of the cathode plate is in full contact with the air through the installation port, and the inner side of the cathode plate is in direct contact with the sludge, it can be ensured that the cathode plate is always in an environment with sufficient air, ensuring the effective progress of the electrochemical reaction, and the sludge in the reaction chamber can be stirred by the stirring mechanism to ensure that the hydroxyl radicals generated by the electro-Fenton can contact the sludge everywhere, thereby improving the sludge treatment effect. The electro-Fenton sludge conditioning reactor is used to treat the sludge, and there is no need to use an aeration system to aerate the cathode. The cathode plate can directly capture oxygen from the air to generate hydrogen peroxide in situ, ensuring the effective progress of the reaction, avoiding the use of an aeration system to aerate the sludge, and the sludge blocking the outlet end of the aeration system, resulting in the aeration system being unable to aerate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a top view of an electro-Fenton sludge conditioning reactor provided by the utility model;

[0020] Figure 2 This is a side view of an electro-Fenton sludge conditioning reactor provided by the utility model;

[0021] Figure 3 This is a front view of a tank body in an electro-Fenton sludge conditioning reactor provided by the utility model;

[0022] Figure 4 This is a front view of a fixed plate in an electro-Fenton sludge conditioning reactor provided by the utility model;

[0023] Figure 5 This is a front view of a sealing gasket in an electro-Fenton sludge conditioning reactor provided by the utility model;

[0024] Figure 6 This is a structural schematic diagram of a stirring mechanism in an electro-Fenton sludge conditioning reactor provided by the utility model;

[0025] In the figure: 100 - tank body, 110 - reaction chamber, 111 - slot, 120 - mounting port, 130 - first mounting hole, 200 - electrode unit, 210 - anode plate, 220 - cathode plate, 300 - stirring mechanism, 310 - rotating shaft, 320 - stirring paddle, 400 - fixing unit, 410 - fixing plate, 411 - first flow outlet, 412 - second mounting hole, 420 - fastener, 421 - screw, 422 - nut, 430 - sealing gasket, 431 - second flow outlet, 432 - third mounting hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The utility model provides an electro-Fenton sludge conditioning reactor, the structure of which is as follows: Figure 1 - Figure 6 As shown, it includes a tank body 100, an electrode unit 200 and a stirring mechanism 300. The tank body 100 has a reaction chamber 110 for containing sludge. A mounting port 120 communicating with the reaction chamber 110 is provided on a side wall of the tank body 100. The electrode unit 200 includes an anode plate 210, a cathode plate 220 and a power supply. The anode plate 210 is disposed in the reaction chamber 110 and is detachably fixed to the tank body 100. The cathode plate 220 abuts against the opening of the mounting port 120 and is detachably sealed and fixed to the tank body 100. The power supply is electrically connected to both the anode plate 210 and the cathode plate 220. The stirring mechanism 300 is used to stir the sludge in the reaction chamber 110.

[0028] When in use, the power supply supplies power to the anode plate 210 and the cathode plate 220, and Fe is added into the reaction chamber 110. 2+Reagent, since the outer side of the cathode plate 220 is in full contact with the air through the installation port 120, and the inner side of the cathode plate 220 is in direct contact with the sludge, it can be ensured that the cathode plate 220 is always in an environment with sufficient air, ensuring the effective progress of the electrochemical reaction, and the sludge in the reaction chamber 110 can be stirred by the stirring mechanism 300 to ensure that the hydroxyl radicals generated by the electro-Fenton can contact the sludge everywhere, thereby improving the sludge treatment effect. The electro-Fenton sludge conditioning reactor is used to treat the sludge, and there is no need to use an aeration system to aerate the cathode. The cathode plate 220 can directly capture oxygen from the air to generate hydrogen peroxide in situ, ensuring the effective progress of the reaction, avoiding the use of an aeration system to aerate the sludge, and the sludge blocking the outlet end of the aeration system, resulting in the aeration system being unable to aerate normally.

[0029] In the prior art, the air cathode is primarily composed of a gas diffusion layer, a current collector, and a catalyst layer. The gas diffusion layer is in contact with the air, preventing leakage of the reaction solution and promoting diffusion of oxygen from the air into the catalyst layer. In the catalyst layer, protons in the solution and oxygen diffused from the outside undergo an oxygen reduction reaction at the catalyst three-phase interface to produce H2O2. The oxygen reduction reaction in the catalytic layer proceeds as follows: First, oxygen from the air diffuses into the cathode catalyst layer and accepts electrons there for a reduction reaction. Depending on the electron acceptance during the oxygen reduction process, it can be divided into a two-electron reduction reaction and a four-electron reduction reaction. In the two-electron pathway, oxygen first accepts two electrons to produce H2O2, while in the four-electron pathway, the H2O2 produced by the two-electron reduction reaction further accepts two electrons to produce H2O, resulting in a lower yield of hydrogen peroxide. To increase the efficient production of H2O2 at the cathode, the two-electron oxygen reduction reaction should primarily occur at the cathode.

[0030] O2+2e - +2H + →H2O2 (two electrons);

[0031] H2O2+2e - +2H + →2H2O (two electrons);

[0032] O2+4e - +4H + →2H2O (four electrons).

[0033] As a preferred embodiment, in actual use, the anode plate 210 is electrically connected to the positive electrode of the power supply via a wire, and the cathode plate 220 is electrically connected to the negative electrode of the power supply via a wire.

[0034] As a preferred embodiment, the electrode unit 200 further includes a circuit breaker, the input end of the circuit breaker is electrically connected to the positive pole of the power supply via a wire, and the output end of the circuit breaker is electrically connected to the anode plate 210 via a wire for controlling the on and off of the circuit.

[0035] As a preferred embodiment, please refer to Figure 1 and Figure 3 A card slot 111 extending in the vertical direction is provided on the two opposite chamber walls of the reaction chamber 110. The two sides of the anode plate 210 are respectively clamped in the corresponding card slots 111, so that the anode plate 210 is detachably connected to the tank body 100 by clamping, which facilitates the disassembly and assembly of the anode plate 210.

[0036] As a preferred embodiment, please refer to Figure 1 The cathode plate 220 and the anode plate 210 are parallel to each other. When the anode plate 210 and the cathode plate 220 are both in a powered state, an electric field is formed between the anode plate 210 and the cathode plate 220.

[0037] As a preferred embodiment, please refer to Figure 1 The cathode plate 220 is arranged outside the tank body 100, so that the cathode plate 220 can be detachably installed on the tank body 100.

[0038] As a preferred embodiment, please refer to Figure 1 and Figure 2 The electro-Fenton sludge conditioning reactor also includes a fixing unit 400, which is detachably fixed to the tank body 100 and is used to press the cathode plate 220 against the outer wall of the tank body 100, thereby realizing the detachable installation of the cathode plate 220 and the tank body 100.

[0039] As a preferred embodiment, please refer to Figure 1 and Figure 4 The fixing unit 400 includes a fixing plate 410 and a plurality of fasteners 420. The fixing plate 410 is provided with a first flow opening 411. Each of the fasteners 420 is used to detachably fix the fixing plate 410 to the trough body 100, so that the two sides of the cathode plate 220 are respectively pressed against the trough body 100 and the fixing plate 410, and the first flow opening 411 corresponds to the mounting port 120. The cathode plate 220 is clamped between the trough body 100 and the fixing plate 410, and the cathode plate 220 can be clamped by the trough body 100 and the fixing plate 410, and the outer side of the cathode plate can be in contact with the air through the first flow opening 411.

[0040] As a preferred embodiment, please refer to Figure 1 and Figure 5 The fixing unit 400 also includes a sealing gasket 430, which has a deformable structure and is provided with a second flow opening 431. The sealing gasket 430 is arranged on the inner side of the fixing plate 410 and is used to press against the cathode sheet 220 so that sludge in the device will not overflow from the cathode sheet. The second flow opening 431 corresponds to the first flow opening 411. The sealing gasket 430 can be used to seal the gap between the cathode sheet 220 and the trough body 100 to ensure that when air contacts the cathode sheet 220, water in the trough body 100 will not leak from the installation port 120.

[0041] As a preferred embodiment, the sealing gasket 430 is made of rubber material. The sealing gasket 430 can be tightly attached to the side wall of the tank body 100 and can seal the gap between the cathode plate 220 and the tank body 100 .

[0042] As a preferred embodiment, the area of the sealing gasket 430 is larger than the area of the cathode plate, so as to seal the gap between the cathode plate 220 and the tank body 100 .

[0043] As a preferred embodiment, please refer to Figure 2 - Figure 5 The trough body 100 is provided with a plurality of first mounting holes 130 that pass through the trough body 100, the fixing plate 410 is provided with a plurality of second mounting holes 412, the sealing gasket 430 is provided with a plurality of third mounting holes 432, each of the fasteners 420 includes a screw 421 and two nuts 422, the screw 421 passes through the first mounting hole 130, the second mounting hole 412 and the third mounting hole 432, the two ends of the nuts 422 are respectively screwed to the two ends of the screw 421, and are respectively screwed to the trough body 100. The body 100 is in contact with the fixing plate 410, the screw 421 is passed through the first mounting hole 130, the second mounting hole 412 and the third mounting hole 432, and the two nuts 422 are respectively threaded on the two ends of the screw 421 until the two nuts 422 are respectively pressed against the trough body 100 and the fixing plate 410, so that the inner side of the cathode plate 220 is pressed against the trough body 100, and the outer side of the cathode plate 220 is pressed against the sealing gasket 430, thereby realizing the installation of the cathode plate 220.

[0044] As a preferred embodiment, please refer to Figure 6The stirring mechanism 300 includes a rotating shaft 310, a plurality of stirring paddles 320, and a rotary drive member. The rotating shaft 310 is vertically arranged in the tank body 100. The stirring paddles 320 are fixed to the rotating shaft 310 at intervals along the length direction of the rotating shaft 310. The blades of the upper and lower adjacent stirring paddles 320 are in opposite directions. The output end of the rotary drive member is fixedly connected to the upper end of the rotating shaft 310 for driving the rotating shaft 310 to rotate. The function of the plurality of stirring paddles 320 is to uniformly stir the sludge in the reactor so that the hydrogen peroxide generated at the cathode can contact and react with the sludge and chemical reagents in the reactor. By manipulating the rotary drive member, the rotary drive member can drive the rotating shaft 310 to rotate, and drive the rotation of each stirring paddle 320. Because the blades of the upper and lower adjacent stirring paddles 320 are in opposite directions, uniform stirring is achieved in the deep sludge, making it difficult for the sludge to adhere to the anode plate 210 and the cathode plate 220, thereby improving the reaction efficiency.

[0045] As a preferred embodiment, 300 mL of concentrated sludge is placed in the reaction chamber 110 and FeSO 4 Provide a certain amount of DS Fe 2+ As a catalyst in the solution, the current density is controlled within a certain range, and the CST of the sludge is greatly reduced after a period of reaction.

[0046] In order to better understand the present invention, the following Figure 1 - Figure 6 The working principle of the technical solution of the utility model is described in detail:

[0047] When in use, the anode plate 210 is electrically connected to the positive electrode of the power supply via a wire, and the cathode plate 220 is electrically connected to the negative electrode of the power supply via a wire. Fe 2+Since the outer side of the cathode plate 220 is in full contact with the air via the first flow port 411 and the second flow port 431, and the inner side of the cathode plate 220 is in contact with the sludge via the mounting port 120, it is ensured that the cathode plate 220 is always in an environment with sufficient air, thereby ensuring the effective conduct of the electrochemical reaction. By manipulating the rotating drive member, the rotating drive member can drive the rotating shaft 310 to rotate, and drive each of the stirring paddles 320 to rotate, so as to stir the sludge in the reaction chamber 110, and ensure that the hydroxyl radicals generated by the electro-Fenton can react with the sludge everywhere. The anode plate 210 and the cathode plate 220 are in contact with each other, thereby improving the sludge treatment effect. Since the blades of the upper and lower adjacent stirring paddles 320 are in opposite directions, uniform stirring is achieved in the high-depth sludge, making it difficult for the sludge to adhere to the anode plate 210 and the cathode plate 220, thereby improving the reaction efficiency. The present electro-Fenton sludge conditioning reactor is used to treat the sludge, and there is no need to use an aeration system to aerate the cathode. The cathode plate 220 can directly capture oxygen from the air to generate hydrogen peroxide in situ, ensuring the effective progress of the reaction and avoiding the problem of using an aeration system to aerate the sludge, which blocks the outlet end of the aeration system and causes the aeration system to be unable to aerate normally.

[0048] The electro-Fenton sludge conditioning reactor provided by the utility model has the following beneficial effects:

[0049] (1) The gap between the cathode plate 220 and the tank body 100 can be sealed by the sealing gasket 430 to ensure that when air contacts the cathode plate 220, water in the tank body 100 will not leak from the mounting port 120;

[0050] (2) Since the blades of the upper and lower adjacent stirring paddles 320 are in opposite directions, uniform stirring is achieved in the deep sludge, making it difficult for the sludge to adhere to the anode plate 210 and the cathode plate 220, thereby improving the reaction efficiency;

[0051] (3) The electro-Fenton sludge conditioning reactor is used to treat the sludge. There is no need to use an aeration system to aerate the cathode. The cathode plate 220 can directly capture oxygen from the air to generate hydrogen peroxide in situ, ensuring the effective progress of the reaction and avoiding the problem of using an aeration system to aerate the sludge, which would clog the outlet of the aeration system and cause the aeration system to be unable to aerate normally.

[0052] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An electro-Fenton sludge conditioning reactor, characterized in that: include: The tank body has a reaction chamber for containing sludge, and a mounting port communicating with the reaction chamber is opened on one side wall of the tank body; an electrode unit comprising an anode sheet, a cathode sheet, and a power supply, wherein the anode sheet is disposed in the reaction chamber and is detachably fixed to the tank body, the cathode sheet abuts against the opening of the mounting port and is detachably sealed and fixed to the tank body, and the power supply is electrically connected to both the anode sheet and the cathode sheet; The stirring mechanism is used to stir the sludge in the reaction chamber.

2. The electro-Fenton sludge conditioning reactor according to claim 1, wherein Two opposite walls of the reaction chamber are each provided with a slot extending in a vertical direction, and both sides of the anode plate are respectively clamped in the corresponding slot.

3. The electro-Fenton sludge conditioning reactor according to claim 1, characterized in that: The cathode plate and the anode plate are parallel to each other.

4. The electro-Fenton sludge conditioning reactor according to claim 1, characterized in that: The cathode plate is arranged outside the tank body.

5. The electro-Fenton sludge conditioning reactor according to claim 4, characterized in that: It also includes a fixing unit, which is detachably fixed to the tank body and is used to press the cathode sheet against the outer side wall of the tank body.

6. The electro-Fenton sludge conditioning reactor according to claim 5, characterized in that: The fixing unit includes a fixing plate and multiple fasteners, and a first flow outlet is opened on the fixing plate. Each of the fasteners is used to detachably fix the fixing plate to the trough body, so that the two sides of the cathode plate are respectively pressed against the trough body and the fixing plate, and the first flow outlet and the installation port correspond to each other.

7. The electro-Fenton sludge conditioning reactor according to claim 6, characterized in that: The fixing unit further includes a sealing gasket having a deformable structure and a second flow opening formed thereon. The sealing gasket is arranged on the inner side of the fixing plate and is used to press against the cathode sheet. The second flow opening corresponds to the first flow opening.

8. The electro-Fenton sludge conditioning reactor according to claim 7, characterized in that: The sealing pad is made of rubber material.

9. The electro-Fenton sludge conditioning reactor according to claim 7, characterized in that: The trough body is provided with a plurality of first mounting holes that all pass through the trough body, the fixing plate is provided with a plurality of second mounting holes, and the sealing gasket is provided with a plurality of third mounting holes. Each of the fasteners includes a screw and two nuts. The screw passes through the first mounting hole, the second mounting hole and the third mounting hole. The two ends of the two nuts are respectively screwed to the two ends of the screw and respectively abut against the trough body and the fixing plate.

10. The electro-Fenton sludge conditioning reactor according to claim 1, characterized in that: The stirring mechanism includes a rotating shaft, multiple stirring paddles and a rotating drive member. The rotating shaft is vertically arranged in the tank body. Each stirring paddle is fixed on the rotating shaft at intervals along the length direction of the rotating shaft. The blades of the upper and lower adjacent stirring paddles have opposite directions. The output end of the rotating drive member is fixedly connected to the upper end of the rotating shaft for driving the rotating shaft to rotate.

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