Device for efficiently treating kitchen biogas slurry through electro-catalysis

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses a device for efficiently treating kitchen biogas slurry by electrocatalysis, which comprises a treatment box and a cover plate covered at the top opening of the treatment box, a reaction chamber is arranged in the treatment box, and a front water inlet groove and a water outlet groove are sequentially arranged between the side wall of the reaction chamber and the side wall of the treatment box along the circumferential direction of the reaction chamber. The side wall of the treatment box is provided with a first front water inlet communicated with the front water inlet tank and a water outlet communicated with the upper part of the side surface of the water outlet tank, and a second front water inlet which is communicated with the front water inlet tank and the reaction chamber and corresponds to the first front water inlet is arranged between the front water inlet tank and the reaction chamber; a catalytic electrode plate is arranged on the bottom surface of the cover plate, an electrode contact electrically connected with the catalytic electrode plate is arranged on the top surface of the cover plate, and the catalytic electrode plate is positioned in the reaction chamber when the cover plate covers the top opening of the treatment box. The kitchen biogas slurry treatment device can be used for efficiently treating kitchen biogas slurry, reaches the nano-tube emission standard, and is lower in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and more specifically, to a device for electrocatalytically and efficiently treating kitchen waste biogas slurry. Background Technique

[0002] The electrocatalytic water treatment technology based on two-dimensional dimensionally stable electrodes is a revolutionary new advanced water treatment technology. It uses free radicals with extremely strong oxidation ability generated by the advanced oxidation process to attack pollutants, achieving rapid and in-depth degradation of pollutants such as COD, ammonia nitrogen, sulfides, and oils, and is known as the "incineration in water" process. Its catalytic oxidation reaction mainly occurs at the anode of the reactor. Anodic oxidation is divided into two paths, namely direct oxidation and indirect oxidation. The active oxygen physically adsorbed on the anode surface appears in the form of extremely active hydroxyl radicals (•OH), while the chemically adsorbed oxygen appears in the form of metal transition state oxides MOx+1. Pollutants are oxidized by binding with •OH or MOx+1, making the refractory macromolecular organic matter in the wastewater oxidized and degraded into low-toxic or non-toxic small-molecular substances, and even directly mineralized into CO2 and H2O.

[0003] Kitchen waste is characterized by high solid-phase organic matter content, high moisture content, and easy biodegradability, making it easy to produce a large amount of high-concentration organic wastewater after anaerobic fermentation treatment. At the same time, the degradation of high-concentration protein makes the kitchen waste fermentation wastewater also have the water quality characteristics of high-concentration ammonia nitrogen. Therefore, kitchen waste fermentation wastewater (kitchen waste biogas slurry) is a kind of high-concentration organic wastewater that is difficult to treat. In view of the practical problem that it is difficult to meet the discharge standards of the sewer network after biochemical treatment of kitchen waste biogas slurry, it is urgent for technicians in this field to provide a device that can efficiently treat kitchen waste biogas slurry. Content of the Utility Model

[0004] In view of this, the utility model provides a device for electrocatalytically and efficiently treating kitchen waste biogas slurry, which can solve the problems that it is difficult to meet the discharge standards of the sewer network when treating kitchen waste biogas slurry, and the electrocatalytic devices used in the current market have low efficiency, high treatment cost, and long treatment time when treating kitchen waste biogas slurry.

[0005] To achieve the above object, the device for electrocatalytically and efficiently treating kitchen waste biogas slurry provided by the utility model includes a treatment tank and a cover plate mounted on the top opening of the treatment tank. A reaction chamber is provided inside the treatment tank. An advancing water tank and an outlet water tank are successively arranged between the side wall of the reaction chamber and the side wall of the treatment tank along the circumferential direction of the reaction chamber. The tops of the reaction chamber, the advancing water tank and the outlet water tank are all interconnected. A first advancing water inlet communicating with the advancing water tank and an outlet communicating with the upper part of the side of the outlet water tank are provided on the side wall of the treatment tank. A second advancing water inlet communicating with both and corresponding to the first advancing water inlet is provided between the advancing water tank and the reaction chamber. A catalytic electrode plate is provided on the bottom surface of the cover plate, and an electrode connector electrically connected to the catalytic electrode plate is provided on the top surface. When the cover plate is mounted on the top opening of the treatment tank, the catalytic electrode plate is located inside the reaction chamber.

[0006] Preferably, a rear water inlet tank is provided between the side wall of the reaction chamber and the side wall of the treatment tank. The rear water inlet tank is arranged opposite to the advancing water tank. A first rear water inlet communicating with the rear water inlet tank is further provided on the side wall of the treatment tank. A second rear water inlet communicating with both and corresponding to the first rear water inlet is provided between the rear water inlet tank and the reaction chamber.

[0007] Preferably, the bottom of the reaction chamber is of a conical bottom structure. The second advancing water inlet and the second rear water inlet are symmetrically arranged about the center. By setting the conical bottom and the tangential water inlet design of the front and rear water inlets, the suspension is prevented from adsorbing on the electrode plate, reducing the service life of the electrode plate.

[0008] Preferably, the included angle between the conical surface of the conical bottom of the reaction chamber and the horizontal plane is 30°.

[0009] Preferably, the second advancing water inlet communicates with the lower part of the side of the advancing water tank, and the second rear water inlet communicates with the lower part of the side of the rear water inlet tank.

[0010] Preferably, the cathode and anode plates of the catalytic electrode plate are alternately distributed under the cover plate, and the cathode and anode plates of the catalytic electrode plate are electrically connected to the positive and negative electrode connectors of the electrode connector respectively.

[0011] It can be seen from the above technical solutions that, compared with the prior art, the device for electrocatalytically and efficiently treating kitchen waste biogas slurry provided by the utility model has a reasonable structure. By utilizing the characteristics of high salinity and high conductivity of kitchen waste biogas slurry, by connecting the advancing water tank with the box body of the treatment tank, a large amount of chlorine free radicals and hydroxyl free radicals in the effluent are used to pre-oxidize the incoming water, greatly saving energy and improving the treatment efficiency. Under low-power conditions, the catalytic electrode plate enables the effluent to meet the discharge standard of the receiving pipe after short-time electrocatalytic treatment of kitchen waste biogas slurry. At the same time, a rear water inlet tank can be added to act together with the advancing water tank, and by increasing the number of water inlet tanks, the treatment efficiency can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on the provided drawings.

[0013] Figure 1 It is a structural perspective view of the device for electrocatalytically and efficiently treating kitchen waste biogas slurry of the present invention.

[0014] Figure 2 It is a structural perspective view of the treatment tank of the present invention.

[0015] Figure 3 It is a structural perspective view of the cover plate of the present invention.

[0016] Figure 4 It is a schematic three-dimensional structure diagram of the treatment tank of the present invention.

[0017] Figure 5 It is another schematic three-dimensional structure diagram of the treatment tank of the present invention.

[0018] Explanation of reference numerals: treatment tank - 1, cover plate - 2, reaction chamber - 3, forward water tank - 4, water outlet tank - 5, water outlet - 6, first forward water inlet - 7, second forward water inlet - 8, electrode connector - 9, catalytic electrode plate - 10, rear water inlet tank - 11, first rear water inlet - 12, second rear water inlet - 13. Detailed implementation manners

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] Please refer to the attached Figures 1-5 , which is a device for electrocatalytically and efficiently treating kitchen waste biogas slurry disclosed by the present invention.

[0021] The device for electrocatalytically and efficiently treating kitchen waste biogas slurry provided by the present invention includes a treatment tank 1, a cover plate 2, a reaction chamber 3, a forward water tank 4, a water outlet tank 5, and a water outlet 6.

[0022] The cover plate 2 is installed on the top opening of the treatment tank 1. Inside the treatment tank 1, there are a reaction chamber 3, a forward water inlet and a forward water tank 4, a water outlet tank 5 and a water outlet 6, as well as a conical bottom. The forward water inlet includes a first forward water inlet 7 and a second forward water inlet 8. Along the circumferential direction of the reaction chamber 3, a forward water tank 4 and a water outlet tank 5 are successively arranged between the side wall of the reaction chamber 3 and the side wall of the treatment tank 1. The side wall of the treatment tank 1 is provided with a first forward water inlet 7 communicating with the forward water tank 4. The first forward water inlet 7 penetrates through the side wall of the treatment tank 1 and is used to convey biogas slurry into the forward water tank 4. There is a second forward water inlet 8 communicating with both the forward water tank 4 and the reaction chamber 3 and corresponding to the first forward water inlet 7. The biogas slurry enters the reaction chamber 3 from the forward water tank 4 through the second forward water inlet 8. The side wall of the treatment tank 1 is also provided with a water outlet 6 communicating with the upper part of the side surface of the water outlet tank 5. The water outlet 6 is located at the upper center position of the water outlet tank 5. As the liquid level in the reaction chamber 3 rises, the biogas slurry overflows into the water outlet tank 5. Under the action of gravity, a small amount of sediment in the biogas slurry accumulates at the bottom of the water outlet tank 5, and the supernatant is discharged from the water outlet 6. The top surface of the cover plate 2 is provided with an electrode connector 9, and the bottom surface is provided with a catalytic electrode plate 10 electrically connected to the electrode connector 9. The cathode and anode plates of the catalytic electrode plate 10 are alternately distributed below the cover plate 2. The cathode and anode plates of the catalytic electrode plate 10 are respectively electrically connected to the positive and negative electrode connectors of the electrode connector 9. The catalytic electrode plate 10 can generate and adsorb hydroxyl radicals, forming a large amount of metal oxides on the surface of the electrode plate to react with the organic pollutants in the kitchen waste biogas slurry, thereby oxidizing the organic pollutants. When the cover plate 2 is installed on the top opening of the treatment tank 1, the catalytic electrode plate 10 is located in the reaction chamber 3, and the water outlet tank 5 is opposite to one end of the electrode plate plane. The tops of the reaction chamber 3, the forward water tank 4 and the water outlet tank 5 are all interconnected, and here they can be interconnected by an open or pipe connection method. As the liquid level in the reaction chamber 3 rises, the biogas slurry after the electrocatalytic reaction flows back to the forward water tank 4. At this time, a large amount of chlorine radicals and hydroxyl radicals contained in the biogas slurry are fully mixed with the original biogas slurry introduced from the first forward water inlet 7, pre-oxidizing the original biogas slurry, destroying the molecular structure of the pollutants, and improving the treatment efficiency.

[0023] To further optimize the above technical solution, a rear water inlet tank 11 is also arranged between the side wall of the reaction chamber 3 and the side wall of the treatment tank. The rear water inlet tank 11 is arranged opposite to the forward water tank 4 and is connected to the top of the reaction chamber 3. The side wall of the treatment tank 1 is provided with a first rear water inlet 12 communicating with the rear water inlet tank 11. There is a second rear water inlet 13 communicating with both the rear water inlet tank 11 and the reaction chamber 3 and corresponding to the first rear water inlet 12. The first rear water inlet 12 and the second rear water inlet 13 form a rear water inlet. By setting the rear water inlet tank 11, the biogas slurry after the electrocatalytic reaction flows back to the forward water tank 4 and the rear water inlet tank 11. At this time, a large amount of chlorine radicals and hydroxyl radicals contained in the biogas slurry are fully mixed with the original biogas slurry introduced from the first forward water inlet 7, pre-oxidizing the original biogas slurry, destroying the molecular structure of the pollutants, and further improving the treatment efficiency.

[0024] To further optimize the above technical solution, the bottom of the reaction chamber 3 is a conical bottom structure, and the second front water inlet 8 and the second rear water inlet 13 are symmetrically arranged about the center. The front and rear water inlets are tangentially distributed on both sides of the conical bottom. The upper part of the conical bottom is connected to the main body of the reaction chamber 3. The biogas slurry entering the reaction chamber 3 through the front water inlet tank 4 and the rear water inlet tank 11, due to the central symmetry between the second front water inlet 8 and the second rear water inlet 13. For example, the front water inlet is located at the lower left front of the treatment tank, and the front water inlet is connected to the front water inlet tank. The rear water inlet is located at the lower right rear of the treatment tank (relative to the front view), and the rear water inlet is connected to the rear water inlet tank. Therefore, under the action of the high-speed inlet water flow, a small vortex is formed at the center of the conical bottom, and a large amount of suspended matter in the biogas slurry and the flocs generated during the electrocatalytic process are aggregated at the center of the conical bottom under the action of the swirl flow, achieving the goal of efficiently removing pollutants and suspended matter, and also avoiding the adsorption of suspended matter on the catalytic electrode plate 10, resulting in the attenuation of the service life of the catalytic electrode plate 10.

[0025] Preferably, the angle between the conical surface of the conical bottom of the reaction chamber 3 and the horizontal plane is 30°.

[0026] Preferably, the second front water inlet 8 communicates with the lower part of the side surface of the front water inlet tank 4, and the second rear water inlet 13 communicates with the lower part of the side surface of the rear water inlet tank 11.

[0027] To further optimize the above technical solution, the water outlet tank 5 and the water outlet 6 can also be respectively set to two, and the two water outlet tanks 5 and the two water inlet tanks (the front water inlet tank 4 and the rear water inlet tank 11) are alternately arranged around the reaction chamber 3 to improve the working efficiency of the device for treating kitchen waste biogas slurry.

[0028] It should be noted that the shapes of the treatment tank 1 and the reaction chamber 3 can be a square box structure or a cylindrical structure with a circular cross-section (as shown in Figure 5 wherein the front water inlet tank 4, the water outlet tank 5 and the rear water inlet tank 11 are arranged in a circular array along the outer periphery of the reaction chamber 3), which is not specifically limited here. Correspondingly, the conical bottom is a quadrangular pyramid or a circular cone and other structures.

[0029] The working principle of the present utility model is as follows: The water flow (biogas slurry) tangentially enters the conical bottom from the front water inlet and the rear water inlet. The suspended matter in the influent water and the flocs generated during the electrocatalytic process are precipitated to the bottom of the conical bottom under the action of the swirl flow. The front and rear water inlet tanks are connected to the reaction chamber 3. As the liquid level in the reaction chamber 3 rises, a part of the effluent flows back to the front and rear water inlet tanks. The chlorine free radicals and hydroxyl free radicals contained in the effluent pre-oxidize the incoming water to improve the treatment efficiency. The water outlet 6 is connected to the water outlet tank 5, and the water outlet 6 is located at the center of the upper part of the side wall of the water outlet tank 5. As the liquid level in the reaction chamber 3 rises, another part of the effluent overflows into the water outlet tank 5. Under the action of gravity, a small amount of sediment in the effluent accumulates at the bottom of the water outlet tank 5, and the supernatant liquid is discharged from the water outlet 6.

[0030] As shown in Table 1 below, they are the water quality indicators of kitchen waste biogas slurry after biological treatment and the discharge standards for pipe network connection. As shown in Table 2 below, it is a comparison table of the treatment effects of the device for electrocatalytically and efficiently treating kitchen waste biogas slurry provided by the present invention and other electrocatalytic devices on the market. It can use a smaller working current and voltage to efficiently treat the biogas slurry in a shorter time and meet the discharge standards, and has a longer service life. Therefore, the device for electrocatalytically and efficiently treating kitchen waste biogas slurry provided by the present invention has higher working efficiency and lower cost.

[0031]

[0032] The device for electrocatalytically and efficiently treating kitchen waste biogas slurry provided by the present invention utilizes the characteristics of high salinity and high conductivity of kitchen waste biogas slurry to oxidize the organic matter in the water quality within 10 - 30 minutes, and the final effluent meets the "Integrated Wastewater Discharge Standard" (DB11 / 307 - 2013) of Beijing and is discharged into the public sewage treatment system standard.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for efficiently treating kitchen waste biogas slurry by electrocatalysis, characterized in that, It includes a processing tank (1) and a cover plate (2) covered on the top opening of the processing tank (1). A reaction chamber (3) is provided inside the processing tank (1). An advancing water tank (4) and a water outlet tank (5) are sequentially arranged along the circumferential direction of the reaction chamber (3) between the side wall of the reaction chamber (3) and the side wall of the processing tank (1). The tops of the reaction chamber (3), the advancing water tank (4) and the water outlet tank (5) are all interconnected. A first advancing water inlet (7) communicating with the advancing water tank (4) and a water outlet (6) communicating with the upper part of the side of the water outlet tank (5) are provided on the side wall of the processing tank (1). A second advancing water inlet (8) communicating with both of them and corresponding to the first advancing water inlet (7) is provided between the advancing water tank (4) and the reaction chamber (3). A catalytic electrode plate (10) is provided on the bottom surface of the cover plate (2), and an electrode connector (9) electrically connected to the catalytic electrode plate (10) is provided on the top surface. When the cover plate (2) is covered on the top opening of the processing tank (1), the catalytic electrode plate (10) is located inside the reaction chamber (3).

2. The device for electrocatalytically and efficiently treating kitchen waste biogas slurry according to claim 1, wherein A rear water inlet tank (11) is further provided between the side wall of the reaction chamber (3) and the side wall of the processing tank (1). The rear water inlet tank (11) is arranged opposite to the advancing water tank (4). A first rear water inlet (12) communicating with the rear water inlet tank (11) is provided on the side wall of the processing tank (1). A second rear water inlet (13) communicating with both of them and corresponding to the first rear water inlet (12) is provided between the rear water inlet tank (11) and the reaction chamber (3).

3. The device for electrocatalytically and efficiently treating kitchen waste biogas slurry according to claim 2, wherein The bottom of the reaction chamber (3) is of a conical bottom structure, and the second advancing water inlet (8) and the second rear water inlet (13) are symmetrically arranged about the center.

4. The device for electrocatalytically and efficiently treating kitchen waste biogas slurry according to claim 3, characterized in that, The included angle between the conical surface of the conical bottom of the reaction chamber (3) and the horizontal plane is 30°.

5. The device for electrocatalytically and efficiently treating kitchen waste biogas slurry according to claim 2, wherein, The second advancing water inlet (8) communicates with the lower part of the side of the advancing water tank (4), and the second rear water inlet (13) communicates with the lower part of the side of the rear water inlet tank (11).

6. The device for electrocatalytically and efficiently treating kitchen waste biogas slurry according to claim 1, wherein, The cathode and anode plates of the catalytic electrode plate (10) are alternately distributed under the cover plate (2), and the cathode and anode plates of the catalytic electrode plate (10) are electrically connected to the positive and negative electrode connectors of the electrode connector (9) respectively.

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