Self-driven electrochemical device for urine resource recovery

Abstract

The utility model provides a self-driven electrochemical device for recycling urine resources. The self-driven electrochemical device comprises a cubic precipitation crystallizer and a conical crystallization precipitator, the lower end of the cubic precipitation crystallizer is connected with the upper end of the conical crystallization precipitator, and the runner baffles are located on the front side and the rear side in the cubic precipitation crystallizer. A water inlet is formed in the front end of the cubic precipitation crystallizer, a water outlet is formed in the rear end of the cubic precipitation crystallizer, and a magnesium anode jack and an air cathode jack are formed in the upper end of the cubic precipitation crystallizer. Two electrodes of the continuous flow self-driven electrochemical cell device are composed of a cathode and an anode, and a reactor is provided with two water inlets and two water outlets, so that the reactor achieves full turbulent flow, and the reaction of phosphorus and magnesium is promoted. According to the utility model, a flow channel is formed and sediments are recycled by utilizing the principle of an inclined plate sedimentation tank, and the assembly mode of a battery cathode is changed, so that the problem that water is easy to leak when the air cathode reactor is assembled is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrodeposition, and in particular relates to a self-driven electrochemical device for recycling urine resources. Background Art

[0002] Source separation Urine contains abundant resources such as nitrogen, phosphorus and potassium. Resource processing of urine can realize the reuse of nitrogen and phosphorus resources, alleviate human dependence on chemical fertilizers, and to a certain extent make up for human demand for nitrogen, phosphorus and potassium resources, which is in line with the concept of sustainable development. Therefore, it is necessary to effectively reuse nitrogen and phosphorus resources;

[0003] Prior art 201910776506.4 provides a method and device for treating dredging wastewater. Magnesium salt is added to the dredging wastewater to form struvite precipitation with nitrogen and phosphorus in the wastewater. The treated wastewater is passed into a fluidized bed. When the wastewater passes through the crystallization zone of the fluidized bed, due to forced stirring and high-concentration sediment induction, the struvite molecular clusters and partially destabilized sediment particles undergo rapid forced agglomeration and crystallization in the crystallization zone, generating a crystallized product struvite with sediment particles as the core. After the particle size of the crystallized product increases, it sinks to the product concentration zone and is concentrated and discharged, realizing the resource utilization of nitrogen and phosphorus. However, forced stirring in the crystallization zone can easily lead to the re-breakage of struvite crystals. During the operation of the reactor, it is necessary to maintain sufficient magnesium source by adding and other methods, which will increase auxiliary operations.

[0004] The existing patent 201010254867.1 provides a continuous flow reactor for high-concentration nitrogen and phosphorus wastewater and a method for treating wastewater thereof, which is to pass the wastewater into a cylindrical coagulation crystallizer, turn on the stirring device, add a soluble magnesium source, and adjust the pH value to maintain it at 7-10. In the stable stage, the initial effluent of the reactor needs to be refluxed for secondary treatment. When the nitrogen and phosphorus removal rates in the effluent reach more than 95%, the reactor needs to manually control the pH and magnesium source of the reactor, otherwise the operation effect of the device will increase. The addition of magnesium source and alkali, the use of a stirrer, and the addition of crystal seeds will increase the operating cost of the entire treatment system. Then it can enter the next treatment unit; in addition, crystal seeds need to be added in the reactor to facilitate the recovery of struvite. Utility Model Content

[0005] The utility model aims to improve the nitrogen and phosphorus treatment performance of the reactor, form a flow channel and recover precipitation by using the principle of an inclined plate sedimentation tank, change the battery cathode assembly method, and solve the problem that the air cathode reactor is prone to water leakage when assembling the reactor.

[0006] To achieve the above-mentioned purpose, the utility model provides a self-driven electrochemical device for urine resource recovery, including a cubic precipitation crystallizer and a conical crystallization precipitator; the lower end of the cubic precipitation crystallizer is connected to the upper end of the conical crystallization precipitator, and the flow channel baffle is located on the front and rear sides of the interior of the cubic precipitation crystallizer; a water outlet is installed on the front end of the cubic precipitation crystallizer, a water inlet is installed on the rear end of the cubic precipitation crystallizer, and a magnesium anode jack and an air cathode jack are installed on the upper end of the cubic precipitation crystallizer; a supporting foot is installed at the lower end of the cubic precipitation crystallizer, a mud discharge port is installed at the bottom end of the conical crystallization precipitator, and a mud discharge valve is installed on the mud discharge port.

[0007] Furthermore, the acute angle formed by the flow channel baffle and the inner wall of the cubic precipitation crystallizer is 60° to 70°, and the spacing between each flow channel baffle is 2 cm.

[0008] Furthermore, the effective volume of the cubic precipitation crystallizer is 280 mL, and the cubic precipitation crystallizer is a single-chamber organic glass cavity.

[0009] Furthermore, the length×width×height of the conical crystallization precipitator is 6cm×8cm×2cm, the angle between the bottom of the conical precipitation crystallizer and the cubic precipitation crystallizer is 10°~30°, and the inner diameter of the mud discharge port is 0.6cm.

[0010] Furthermore, the magnesium anode socket is plugged with a magnesium anode, and the air cathode socket is plugged with an air cathode; the magnesium anode and the air cathode are connected to an external resistor via a wire to form a closed loop.

[0011] Furthermore, the magnesium anode is made of AZ31B magnesium plate, the main part is a 5cm×5cm×0.3mm rectangular parallelepiped, and the upper part is a 3cm×0.8cm×0.3mm rectangular parallelepiped convex structure.

[0012] Furthermore, the air cathode is assembled from three organic glass plates.

[0013] Beneficial effects:

[0014] 1. The utility model uses the principle of inclined plate sedimentation tank to form flow channels and recover sediments on the one hand; on the other hand, it changes the battery cathode assembly method to solve the problem of water leakage in the air cathode reactor when assembling the reactor, and at the same time helps to reduce the footprint of the device and achieve zero power consumption operation. The plug-in anode and cathode are convenient for maintenance and replacement of the anode and cathode, and can realize the automatic operation of the device.

[0015] 2. The utility model makes the magnesium air fuel cell into a continuous flow reactor to improve the nitrogen and phosphorus treatment performance of the reactor. Through the long-term operation of the continuous flow reactor, some crystal seeds are retained and the appropriate pH environment is maintained, providing a suitable growth environment for struvite. The recovered struvite crystals are larger in size and the product quality is higher; and the continuous flow operation can increase the processing load of the magnesium air fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the self-driven electrochemical device of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the self-driven electrochemical device of the utility model (excluding the magnesium anode and the air cathode);

[0018] Figure 3 It is a top schematic diagram of the self-driven electrochemical device of the utility model (without organic glass);

[0019] Figure 4 It is a cross-sectional view of the self-driven electrochemical device of the utility model (viewed from the front to the back);

[0020] Figure 5 It is a cross-sectional view of a cubic precipitation crystallizer of the utility model (viewed from left to right).

[0021] Figure markings: 1-cubic sedimentation crystallizer, 2-conical crystallization precipitator, 3-flow channel baffle, 4-water inlet, 5-water outlet, 6-magnesium anode socket, 7-air cathode socket, 8-support foot, 9-plexiglass plate, 10-magnesium anode, 11-air cathode, 12-mud discharge port, 13-mud discharge valve. DETAILED DESCRIPTION

[0022] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings.

[0023] The structure of the utility model is described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1-5As shown, a self-driven electrochemical device for urine resource recovery includes a cubic precipitation crystallizer 1 and a conical crystallization precipitator 2. The lower end of the cubic precipitation crystallizer 1 is connected to the upper end of the conical crystallization precipitator 2, and the flow channel baffle 3 is located at the front and rear sides of the cubic precipitation crystallizer 1. The cubic precipitation crystallizer 1 is composed of a shell and a flow channel baffle 3. The acute angle formed by the flow channel baffle 3 and the inner wall of the cubic precipitation crystallizer 1 is 60° to 70°. The flow channel baffle 3 is used to form a stable water flow channel in the cubic precipitation crystallizer 1 and facilitate the sediment to slide into the conical crystallization precipitator 2. The distance between the flow channel baffles 3 on each side is 2 cm, and the contact point between the uppermost flow channel baffle 3 on the rear side and the side wall of the cubic precipitation crystallizer 1 is 1 cm higher than the contact point between the uppermost flow channel baffle 3 on the front side and the side wall of the cubic precipitation crystallizer 1. The front end of the cubic precipitation crystallizer 1 is provided with a water outlet 5, the rear end of the cubic precipitation crystallizer 1 is provided with a water inlet 4, and the upper end of the cubic precipitation crystallizer 1 is provided with a magnesium anode socket 6 and an air cathode socket 7, wherein the air cathode socket 7 is located between the magnesium anode sockets 6, the magnesium anode socket 6 is used to plug in the magnesium anode 10, and the air cathode socket 7 is used to plug in the air cathode 11. Urine enters the cubic precipitation crystallizer 1 from the water inlet 4, forms a stable flow channel under the action of the air cathode 11 and the magnesium anode 10, and finally the urine flows out from the water outlet 5 of the cubic precipitation crystallizer 1, and the generated precipitate slides through the flow channel baffle 3 to the conical crystallization precipitator 2 at the bottom.

[0025] A supporting foot 8 is installed at the lower end of the cubic precipitation crystallizer 1. The effective volume of the cubic precipitation crystallizer 1 is 280 mL. The cubic precipitation crystallizer 1 is a single-chamber organic glass cavity.

[0026] The bottom end of the conical crystallization precipitator 2 is provided with a mud discharge port 12, and a mud discharge valve 13 is provided on the mud discharge port 12. The length×width×height of the conical crystallization precipitator 2 is 6 cm×8 cm×2 cm, the angle formed between the conical crystallization precipitator 2 and the bottom of the cubic precipitation crystallizer 1 is 10° to 30°, and the inner diameter of the mud discharge port 12 is 0.6 cm.

[0027] The magnesium anode 10 and the air cathode 11 are connected to an external resistor via a wire to form a closed loop, and a multi-channel voltage acquisition device is connected in parallel with the external resistor to monitor and record voltage data in real time.

[0028] The effective area of ​​magnesium anode 10 is 25cm 2 The magnesium anode 10 is made of AZ31B magnesium plate, the main part is a 5cm×5cm×0.3mm rectangular parallelepiped, and the upper part is a 3cm×0.8cm×0.3mm rectangular parallelepiped convex structure. The magnesium anode is insulated with silicone to prevent surface oxidation and touch from increasing external resistance. Use a manual grinding wheel to polish the surface until it is bright, wipe off the residual dust on the surface, and put it in a sealed bag for use.

[0029] Air cathode 11 effective area 36cm 2 The air cathode 11 is assembled from three organic glass plates 9. The cavity of the middle organic glass plate 9 is filled with air, which provides air to promote the cathode to catalyze the conversion of O2 into OH - The air cathode is a plug-in structure, which is convenient for cathode maintenance and replacement.

[0030] The two electrodes of the continuous flow self-driven electrochemical cell device are composed of an air cathode 11 and two magnesium anodes 10. The reactor has two water inlets 5 and two water outlets 4, so as to achieve sufficient turbulence in the reactor and promote the reaction between phosphorus and magnesium.

[0031] The working principle of this utility model:

[0032] Under the action of the peristaltic pump, urine is transported by a pipeline to the water inlet 4 of the magnesium air fuel cell reactor. As urine continues to enter the device, the liquid level of the solution in the reactor will gradually rise. When the liquid level of the solution contacts the magnesium anode 10 and the air cathode 11, the electrolyte, the magnesium anode 10, the air cathode 11 and the wire form a closed loop, and a reaction zone is formed between the magnesium anode 10 and the air cathode 11. A phosphate precipitation reaction occurs in the reaction zone, and the generated precipitate slides to the conical precipitation crystallizer 2 and is then discharged through the mud outlet 12. The discharged precipitate is then dried and evaporated to remove moisture and can be directly used as a phosphate fertilizer. The whole process mainly removes phosphorus and part of ammonia nitrogen. Under the action of the flow channel baffle 3, a stable flow channel is formed in the reactor until the liquid level of the solution in the reactor rises to the water outlet 5 and is discharged through the drainage pipe.

[0033] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A self-driven electrochemical device for urine resource recovery, characterized in that: It includes a cubic precipitation crystallizer and a conical crystallization crystallizer; the lower end of the cubic precipitation crystallizer is connected to the upper end of the conical crystallization crystallizer, and the flow channel baffle is located at the front and rear sides of the cubic precipitation crystallizer; a water outlet is installed on the front end of the cubic precipitation crystallizer, a water inlet is installed on the rear end of the cubic precipitation crystallizer, and a magnesium anode socket and an air cathode socket are installed on the upper end of the cubic precipitation crystallizer; a supporting foot is installed at the lower end of the cubic precipitation crystallizer, a mud discharge port is installed at the bottom end of the conical crystallization crystallizer, and a mud discharge valve is installed on the mud discharge port.

2. The self-driven electrochemical device for urine resource recovery according to claim 1, characterized in that: The acute angle formed by the flow channel baffle and the inner wall of the cubic precipitation crystallizer is 60° to 70°, and the spacing between each flow channel baffle is 2 cm.

3. The self-driven electrochemical device for urine resource recovery according to claim 1, characterized in that: The effective volume of the cubic precipitation crystallizer is 280 mL, and the cubic precipitation crystallizer is a single-chamber organic glass cavity.

4. The self-driven electrochemical device for urine resource recovery according to claim 1, characterized in that: The length×width×height of the conical crystallization precipitator is 6cm×8cm×2cm, the angle between the bottom of the conical precipitation crystallizer and the bottom of the cubic precipitation crystallizer is 10°-30°, and the inner diameter of the mud discharge port is 0.6cm.

5. The self-driven electrochemical device for urine resource recovery according to claim 1, characterized in that: The magnesium anode socket is plugged with a magnesium anode, and the air cathode socket is plugged with an air cathode; the magnesium anode and the air cathode are connected to an external resistor via a wire to form a closed loop.

6. The self-driven electrochemical device for urine resource recovery according to claim 5, characterized in that: The magnesium anode is made of AZ31B magnesium plate, the main part is a 5cm×5cm×0.3mm rectangular parallelepiped, and the upper part is a 3cm×0.8cm×0.3mm rectangular parallelepiped convex structure.

7. The self-driven electrochemical device for urine resource recovery according to claim 5, characterized in that: The air cathode is assembled from three organic glass plates.

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