Composite cathode bioelectricity desalted water treatment device

Abstract

The utility model provides a composite cathode bioelectric desalting water treatment device. The composite cathode bioelectric desalting water treatment device comprises a membrane roll, an anode electrode, a cathode electrode, a bioelectric desalting device reactor, a water treatment filler layer and a desalting chamber, a cylindrical rolled membrane roll is arranged in the bioelectric desalting device reactor, a desalting chamber is arranged in a middle interlayer of the membrane roll, an anode chamber is arranged on one side of the membrane roll, a cathode chamber is arranged on the other side of the membrane roll, an anode electrode is arranged in the anode chamber, and a cathode electrode and a water treatment filler layer are arranged in the cathode chamber. And the anode electrode and the cathode electrode are connected to form a loop. A water treatment filler layer is added to a biological cathode of the bioelectric desalting equipment, aerobic cathode electrogenesis bacteria are enriched to a carbon-based electrode material in this way, nitrifying bacteria and part of heterotrophic bacteria are enriched into filler, spatial separation of the bacteria is achieved, and the treatment effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment, and specifically, to a composite cathode bioelectrodesalination sewage treatment device. Background Art

[0002] Microbial electrodesalination technology is the coupling of microbial fuel cells and electrodialysis desalination. A desalination chamber is used to separate the anode chamber and the cathode chamber, and an ion exchange membrane is added to replace the original proton exchange membrane. It is a water quality treatment technology based on the principle of bioelectrochemistry. Through the action of electricity-producing microorganisms, the chemical energy existing in sewage is converted into electrical energy output, and at the same time, the brine is desalinated.

[0003] Electricity-producing microorganisms on the anode biofilm anaerobically oxidize organic matter, transform and decompose it to release electrons. The electrons are transmitted to the cathode through an external circuit, and oxygen is reduced as an electron acceptor. At the same time, ions in the desalination chamber are transferred to both poles through anion and cation exchange membranes under the action of an electric field, realizing desalination and achieving the triple effects of water quality treatment, organic matter degradation, and brackish water desalination. Through technical retrieval, it is found that Patent CN218146050U discloses an ion membrane module for microbial desalination and a microbial desalination sewage treatment device, and Patent CN111807503A discloses an oxygen-limited microbial desalination tank and a wastewater treatment method.

[0004] Relying on the membrane roll manufacturing method of anode / membrane / cathode three-in-one is a relatively good reactor form. To further improve the electricity generation and sewage treatment performance, it is also necessary to optimize the cathode and the aerobic reaction zone of the cathode. During the operation of the actual domestic sewage electricity generation and desalination equipment, the potential of the anode shows relative stability. However, the potential of the cathode is affected by multiple factors including aeration, the biomass and activity of electricity-producing bacteria, etc., resulting in significant fluctuations. This fluctuation ultimately leads to the instability of the overall performance of the desalination system. During the experiment of the biocathode device, the anode shows a relatively high potential, while the cathode shows a relatively low potential. Further internal resistance analysis reveals the phenomenon of low internal resistance of the anode and high internal resistance of the cathode. These factors work together to reduce the overall voltage and current output of the system, and thus have an adverse impact on the desalination efficiency. Therefore, it is necessary to propose a solution that can strengthen the cathode potential and improve the overall performance of the electrodesalination device. Summary of the Utility Model

[0005] Aiming at the defects in the prior art, the purpose of the utility model is to provide a composite cathode bioelectrodesalination sewage treatment device.

[0006] According to a composite cathode bioelectrodesalination sewage treatment device provided by the utility model, it includes: a membrane roll, an anode electrode, a cathode electrode, a bioelectrodesalination device reactor, a water treatment packing layer, and a desalination chamber;

[0007] Inside the reactor of the bioelectric desalination device, there is a cylindrically rolled membrane roll. The middle interlayer of the membrane roll is the desalination chamber. One side of the membrane roll is set as the anode chamber, and the other side is set as the cathode chamber. An anode electrode is arranged in the anode chamber, and a cathode electrode and a water treatment filler layer are arranged in the cathode chamber. The anode electrode is connected to the cathode electrode to form a circuit.

[0008] Preferably, the membrane roll includes a cation exchange membrane and an anion exchange membrane;

[0009] The interlayer between the cation exchange membrane and the anion exchange membrane is the desalination chamber.

[0010] Preferably, an anion exchange membrane is arranged on the side of the membrane roll close to the anode electrode, and a cation exchange membrane is arranged on the side of the membrane roll close to the cathode electrode.

[0011] Preferably, carbon felt is arranged on the outer side of the cation exchange membrane as the cathode electrode.

[0012] Preferably, one end of the anode electrode is connected to one end of the cathode electrode through a titanium wire, and a resistor is connected to the titanium wire.

[0013] Preferably, the material of the water treatment filler layer includes PE, PP, PS, ABS, PVDF, PVC, polyurethane, and the volume ratio of the water treatment filler layer in the cathode chamber is 20%-90%.

[0014] Preferably, the inner side of the membrane roll is set as the anode chamber, and the outer side is set as the cathode chamber.

[0015] Preferably, a microporous aeration pipe is conducted in the cathode chamber, and aeration bubbles are generated through the microporous aeration pipe.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. Compared with the traditional biological cathode, the composite cathode of the biological electrode and the water treatment filler layer adopted in this application can realize the spatial separation of different strains, increase the cathode potential, reduce the cathode internal resistance, stably output voltage and current, and thus improve the desalination ability of the equipment;

[0018] 2. The combination method of the composite cathode in this application is simple to operate, low in cost, and can be reformed and upgraded without stopping production. Description of the Drawings

[0019] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the utility model will become more obvious:

[0020] Figure 1It is a schematic diagram of the principle of a composite cathode bioelectrochemical desalination water treatment device;

[0021] Figure 2 It is a top view schematic diagram of the composite cathode bioelectrochemical desalination water treatment device;

[0022] As shown in the figure:

[0023]

[0024] Specific implementation manner

[0025] The following is a detailed description of the present utility model in combination with specific embodiments. The following embodiments will help those skilled in the art to further understand the present utility model, but do not limit the present utility model in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several changes and improvements can still be made. These all belong to the protection scope of the present utility model.

[0026] Embodiment 1

[0027] In this embodiment, aiming at the technical problems such as low and unstable cathode potential of the bioelectrochemical desalination equipment and poor power generation performance of single equipment, based on the manufacturing method of the anode / membrane / cathode three-in-one membrane roll 1, a water treatment filler layer 5 is added to the bio-cathode of the bioelectrochemical desalination equipment. In this way, aerobic cathode electricity-producing bacteria are enriched on the carbon-based electrode material, nitrifying bacteria and some heterotrophic bacteria are enriched in the filler, realizing the spatial separation of the bacterial species. While ensuring the aerobic cathode nitrification reaction of the equipment, the number and activity of the electricity-producing bacteria on the carbon-based electrode are enhanced, the potential of the cathode electrode 3 of the electro-desalination equipment is increased, the current of the equipment is increased, and the stable output of the equipment is maintained, so that more ions are removed under electro-migration, and desalted water with lower conductivity is obtained.

[0028] Specifically, as Figure 1-2 shown, this embodiment includes: a membrane roll 1, an anode electrode 2, a cathode electrode 3, a bioelectrochemical desalination device reactor 4, a water treatment filler layer 5, and a desalination chamber 6; a cylindrically rolled membrane roll 1 is arranged in the bioelectrochemical desalination device reactor 4. The middle interlayer of the membrane roll 1 is a desalination chamber 6. The inner side of the membrane roll 1 is set as an anode chamber, and the outer side is set as a cathode chamber. The anode electrode 2 is arranged in the anode chamber, and the cathode electrode 3 and the water treatment filler layer 5 are arranged in the cathode chamber. One end of the anode electrode 2 is connected to one end of the cathode electrode 3 through a titanium wire lead 7, and a resistor 8 is connected to the titanium wire lead 7.

[0029] In one embodiment, the membrane roll 1 includes a cation exchange membrane and an anion exchange membrane; the interlayer between the cation exchange membrane and the anion exchange membrane is a desalination chamber 6. An anion exchange membrane is arranged on the side of the membrane roll 1 close to the anode electrode 2, and a cation exchange membrane is arranged on the side of the membrane roll 1 close to the cathode electrode 3. A carbon felt is arranged outside the cation exchange membrane as the cathode electrode 3, and a carbon brush is arranged outside the anion exchange membrane (i.e., the inner cylinder side) as the anode electrode 2.

[0030] In one embodiment, the material of the water treatment packing layer 5 includes PE, PP, PS, ABS, PVDF, PVC, polyurethane, and the volume ratio of the water treatment packing layer 5 in the cathode chamber is 20%-90%.

[0031] Example 2

[0032] As Figure 1-2 shown, this embodiment includes a membrane roll 1, which is composed of an anion exchange membrane, a cation exchange membrane, a carbon brush of the anode electrode 2 and a carbon felt of the cathode electrode 3. The desalination chamber 6 in the membrane roll 1 is formed by the interlayer between the anion exchange membrane and the cation exchange membrane.

[0033] In the electro - desalination device 4, the anode chamber provides an anaerobic environment for the anaerobic oxidation of organic matter by electrogenic bacteria, and the cathode chamber is an aerobic environment. Bubbles are generated by microporous aeration, and a reduction reaction occurs with oxygen as the electron acceptor.

[0034] The electrogenic microorganisms on the anode electrode 2 carry out anaerobic oxidation of organic matter, transform and decompose it, and release electrons. The electrons are transmitted through the titanium wire 7 to form a closed circuit, thus generating an electric current. At the same time, ions in the desalination chamber 6 are transmitted to both poles through the anion exchange membrane and the cation exchange membrane under the action of an electric field, realizing desalination and achieving the triple effects of water quality treatment, organic matter degradation, and saline water desalination.

[0035] A water treatment packing 5 is added to the aerobic cathode to form a water treatment packing layer 5. The modified packing is more convenient for bio - film formation; the composite method of the cathode bio - electrode (i.e., the cathode electrode 3) and the water treatment packing provides a suitable growth environment for electrogenic bacteria and nitrifying bacteria respectively, separates and enriches different functional bacteria, increases the number and activity of electrogenic bacteria on the carbon felt of the cathode electrode 3, and at the same time enriches nitrifying bacteria on the water treatment packing, enabling various functional bacteria to play their roles better.

[0036] It not only ensures the improvement of the cathode nitrification function and the effluent water quality, but also increases the cathode potential, enhances the power generation performance of the device, and reduces the conductivity of the desalinated water.

[0037] In one embodiment, according to the different positions of the anion exchange membrane and the cation exchange membrane, the functions of the membrane roll 1 can be distinguished. When the cation exchange membrane is on the anode and the anion exchange membrane is on the cathode, it forms a concentration membrane roll, and by swapping the positions, it can be changed to a desalination membrane roll.

[0038] In one embodiment, the anode electrode 2 and the cathode electrode 3 can be carbon-based biologic electrodes such as carbon paper, carbon brush, and carbon felt.

[0039] In one embodiment, the water treatment packing in the water treatment packing layer 5 can be suspended packing, including but not limited to annular, spherical, sponge porous type, and tooth surface type water treatment packing.

[0040] In one embodiment, the water treatment packing in the water treatment packing layer 5 can be made of materials such as PE, PP, PS, ABS, PVDF, PVC, and polyurethane. After the packing is film-formed, its density is close to that of water, and it has a large specific surface area to provide more biological attachment space.

[0041] In one embodiment, the filling ratio range of the water treatment packing in the water treatment packing layer 5 in the aerobic cathode is 20%-90%.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0043] The specific embodiments of the present utility model have been described above. It should be understood that the present utility model is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present utility model. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A composite cathode bioelectric desalination water treatment device, characterized in that: include: A membrane roll (1), an anode electrode (2), a cathode electrode (3), a bioelectric desalination device reactor (4), a water treatment filler layer (5), and a desalination chamber (6); A cylindrically rolled membrane roll (1) is arranged in the reactor (4) of the bioelectric desalination device. The middle interlayer of the membrane roll (1) is a desalination chamber (6). One side of the membrane roll (1) is arranged as an anode chamber, and the other side is arranged as a cathode chamber. An anode electrode (2) is arranged in the anode chamber, and a cathode electrode (3) and a water treatment filler layer (5) are arranged in the cathode chamber. The anode electrode (2) is connected to the cathode electrode (3) to form a loop.

2. The composite cathode bioelectric desalination water treatment device according to claim 1, characterized in that: The membrane roll (1) comprises: a cation exchange membrane and an anion exchange membrane; The interlayer between the cation exchange membrane and the anion exchange membrane is a desalination chamber (6).

3. The composite cathode bioelectric desalination water treatment device according to claim 2, characterized in that: An anion exchange membrane is arranged on the side of the membrane roll (1) close to the anode electrode (2), and a cation exchange membrane is arranged on the side of the membrane roll (1) close to the cathode electrode (3).

4. The composite cathode bioelectric desalination water treatment device according to claim 2, characterized in that: A carbon felt is arranged on the outer side of the cation exchange membrane as a cathode electrode (3).

5. The composite cathode bioelectric desalination water treatment device according to claim 1, characterized in that: One end of the anode electrode (2) is connected to one end of the cathode electrode (3) via a titanium wire conductor (7), and a resistor (8) is connected to the titanium wire conductor (7).

6. The composite cathode bioelectric desalination water treatment device according to claim 1, characterized in that: The material of the water treatment filler layer (5) includes PE, PP, PS, ABS, PVDF, PVC, and polyurethane, and the volume of the water treatment filler layer (5) in the cathode chamber accounts for 20%-90%.

7. The composite cathode bioelectric desalination water treatment device according to claim 1, characterized in that: The inner side of the membrane roll (1) is arranged as an anode chamber, and the outer side is arranged as a cathode chamber.

8. The composite cathode bioelectric desalination water treatment device according to claim 1, characterized in that: The cathode chamber is connected to a microporous aeration tube and aeration bubbles are generated through the microporous aeration tube.

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