Gas and fertilizer producing device

Abstract

The invention discloses a gas and fertilizer producing device, and relates to the technical field of sewage recycling, the gas and fertilizer producing device comprises a feeding container, a membrane bioreactor, a liquid fertilizer container, an alkali liquor storage device, a porous hydrophobic membrane, an electrolyzer, an electrolytic positive electrode and an electrolytic negative electrode, a reaction tank is formed in the membrane bioreactor; the reaction tank is connected with the feeding container to enable sewage in the feeding container to flow into the reaction tank, the liquid fertilizer container is connected with the reaction tank to enable effluent of the reaction tank to flow into the liquid fertilizer container, the alkali liquor storage device forms an alkali liquor tank, and water in the reaction tank spontaneously flows into the alkali liquor tank through a porous hydrophobic membrane in the form of water vapor. The electrolytic tank is communicated with the alkali liquor tank, so that an alkali solution in the alkali liquor tank flows into the electrolytic tank, and water in the alkali solution in the electrolytic tank is electrolyzed to form oxygen and hydrogen. According to the gas and fertilizer producing device, harmlessness and recycling of sewage can be achieved while the sewage is treated, recycling of resources is achieved, the resources are saved, and the environment is protected.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage resource utilization, and particularly relates to a device for generating gas and fertilizer. Background Art

[0002] In the related art, realizing the harmlessness and resource utilization of sewage while treating sewage is of great significance in today's society with shortages of resources and energy. Nitrogen and phosphorus in sewage can be used as fertilizers, and the water resources in sewage can also be utilized. If the treated sewage is directly discharged, it is easy to cause waste of resources. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a device for generating gas and fertilizer, which can realize the harmlessness and resource utilization of sewage while treating sewage, can realize the reuse of resources, save resources, and protect the environment.

[0004] The gas and fertilizer generating device according to an embodiment of the present invention includes: a feed container, a membrane bioreactor, a liquid fertilizer container, an alkali solution storage, a porous hydrophobic membrane, an electrolyzer, an electrolysis positive electrode, and an electrolysis negative electrode. The feed container is used for storing sewage. A reaction tank is formed in the membrane bioreactor, and the reaction tank is connected to the feed container so that the sewage in the feed container flows into the reaction tank. The liquid fertilizer container is connected to the reaction tank so that the effluent from the reaction tank flows into the liquid fertilizer container. An alkali solution pool is formed in the alkali solution storage, and the alkali solution pool and the reaction tank are respectively located on both sides of the porous hydrophobic membrane, so that the water in the sewage in the reaction tank spontaneously passes through the porous hydrophobic membrane in the form of water vapor and flows into the alkali solution pool to supplement pure water to the alkali solution pool. An electrolysis cell is formed in the electrolyzer, and the electrolysis cell is communicated with the alkali solution pool so that the alkaline solution in the alkali solution pool flows into the electrolysis cell. At least part of the electrolysis positive electrode and at least part of the electrolysis negative electrode are arranged in the electrolysis cell to electrolyze the water in the alkaline solution in the electrolysis cell to form oxygen and hydrogen.

[0005] According to the gas and fertilizer generating device of the present application, the gas and fertilizer generating device can treat sewage, and the products after the sewage is treated can be recycled. The water in the sewage can become hydrogen and oxygen, the organic matter in the sewage can become methane, and the nitrogen and phosphorus in the sewage can be concentrated into liquid fertilizer. It can realize the harmlessness and resource utilization of sewage while treating sewage, can realize the reuse of resources, save resources, and protect the environment.

[0006] According to some embodiments of the present invention, the membrane bioreactor has a filtration structure. The top wall of the reaction tank has a reaction tank water outlet, and the liquid fertilizer container is communicated with the reaction tank water outlet. The filtration structure is located inside the reaction tank so that the water in the sewage in the reaction tank flows through the filtration structure to the reaction tank water outlet.

[0007] According to some embodiments of the present invention, the top wall of the reaction tank has a gas outlet, and methane in the reaction tank is discharged from the reaction tank through the gas outlet.

[0008] According to some embodiments of the present invention, the gas and fertilizer production device further includes: a first communication pipe and a first peristaltic pump. The first communication pipe communicates the liquid fertilizer container and the reaction tank, and the first peristaltic pump and the first communication pipe are cooperatively assembled to pump the water in the sewage in the reaction tank into the liquid fertilizer container.

[0009] According to some embodiments of the present invention, the gas and fertilizer production device further includes: a second communication pipe and a second peristaltic pump. A reaction tank inlet is formed on the side wall of the reaction tank, and the reaction tank inlet is formed at the lower end of the side wall of the reaction tank. The second communication pipe communicates the feed container and the reaction tank, and the second peristaltic pump and the second communication pipe are cooperatively assembled to pump the sewage in the feed container into the reaction tank.

[0010] According to some embodiments of the present invention, the gas and fertilizer production device further includes: a controller and a liquid level sensor. The liquid level sensor is used to detect the liquid level height in the reaction tank. The controller is communicatively connected to both the liquid level sensor and the second peristaltic pump, and the controller is configured to control the operation of the second peristaltic pump according to the liquid level height detected by the liquid level sensor.

[0011] According to some embodiments of the present invention, the gas and fertilizer production device further includes: a third communication pipe and a third peristaltic pump. The lye tank has a lye tank outlet, and the third communication pipe communicates the lye tank outlet and the electrolytic cell. The third peristaltic pump and the third communication pipe are cooperatively assembled to pump the alkaline solution in the lye tank into the electrolytic cell.

[0012] According to some embodiments of the present invention, the gas and fertilizer production device further includes: a fourth communication pipe. The lye tank has a lye tank inlet, and the fourth communication pipe communicates the lye tank inlet and the electrolytic cell so that the alkaline solution in the electrolytic cell flows into the lye tank.

[0013] According to some embodiments of the present invention, the thickness dimension of the porous hydrophobic membrane is D, satisfying the relationship: 10 μm ≤ D ≤ 100 μm; and / or a dense hydrophilic layer is provided on one side surface of the porous hydrophobic membrane facing the reaction tank.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0016] Figure 1 is a schematic diagram of a gas and fertilizer production device according to an embodiment of the present application;

[0017] Figure 2 is a schematic diagram of the cooperation of a reaction tank, an alkali solution tank, and an electrolytic cell according to an embodiment of the present application;

[0018] Figure 3 is Figure 2 a partial enlarged schematic diagram of area A in

[0019] Reference numerals:

[0020] Gas and fertilizer production device 1,

[0021] Feeding container 10,

[0022] Reaction tank 20, filtration structure 21, reaction tank water outlet 22, reaction tank inlet 23,

[0023] Liquid fertilizer container 30,

[0024] Alkali solution tank 40, alkali solution tank inlet 41, alkali solution tank outlet 42,

[0025] Electrolytic cell 51, electrolytic cell inlet 511, electrolytic cell outlet 512, first sub-electrolytic cell 513, oxygen outlet 5131, second sub-electrolytic cell 514, hydrogen outlet 5141, electrolytic positive electrode 52, electrolytic negative electrode 53, power supply 54, diaphragm 55,

[0026] Porous hydrophobic membrane 60,

[0027] First connecting pipe 71, first peristaltic pump 72, second connecting pipe 73, second peristaltic pump 74, third connecting pipe 75, third peristaltic pump 76, fourth connecting pipe 77,

[0028] Liquid level sensor 81, liquid level gauge 82. Detailed Embodiments

[0029] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0030] Reference is made below Figure 1 to describe the gas and fertilizer production device 1 according to an embodiment of the present invention.

[0031] The gas and fertilizer production device 1 according to an embodiment of the present invention, as Figure 1 shown, the gas and fertilizer production device 1 may include: a feed container 10, a membrane bioreactor, a liquid fertilizer container 30, an alkali solution storage, a porous hydrophobic membrane 60, an electrolyzer, an electrolysis positive electrode 52, and an electrolysis negative electrode 53. The feed container 10 is used for storing sewage. A reaction tank 20 is formed in the membrane bioreactor. The reaction tank 20 is connected to the feed container 10 so that the sewage in the feed container 10 flows into the reaction tank 20. The liquid fertilizer container 30 is connected to the reaction tank 20 so that the effluent of the reaction tank 20 flows into the liquid fertilizer container 30. The alkali solution storage forms an alkali solution tank 40. The alkali solution tank 40 and the reaction tank 20 are respectively located on both sides of the porous hydrophobic membrane 60, so that the water in the sewage in the reaction tank 20 spontaneously passes through the porous hydrophobic membrane 60 in the form of water vapor and flows into the alkali solution tank 40 to supplement pure water to the alkali solution tank 40. The electrolyzer forms an electrolysis cell 51. The electrolysis cell 51 is communicated with the alkali solution tank 40 so that the alkaline solution in the alkali solution tank 40 flows into the electrolysis cell 51. At least part of the electrolysis positive electrode 52 and at least part of the electrolysis negative electrode 53 are arranged in the electrolysis cell 51 to electrolyze the water in the alkaline solution in the electrolysis cell 51 to form oxygen and hydrogen.

[0032] It should be noted that in the related art, achieving the harmlessness and resource utilization of sewage while treating sewage is of great significance in today's society with shortages of resources and energy. Nitrogen and phosphorus in sewage can be used as fertilizers, and the water resources in sewage can also be utilized. If the treated sewage is directly discharged, it is easy to cause waste of resources.

[0033] Based on this, an embodiment of the present application proposes a gas and fertilizer production device 1. The gas and fertilizer production device 1 can be used to treat sewage. The gas and fertilizer production device 1 can produce clean energy such as methane and hydrogen, and can realize the resource utilization of various substances in the sewage. The feed container 10 can be used to store sewage, and the membrane bioreactor can be used to treat sewage. A reaction tank 20 can be formed inside the membrane bioreactor. The reaction tank 20 can be connected to the feed container 10. The reaction tank 20 can be formed with a liquid inlet. The sewage in the feed container 10 can flow into the reaction tank 20 through the liquid inlet. The reaction tank 20 can be used to treat sewage, and the products after the sewage is treated can be recycled and reused. The reaction tank 20 can be connected to the liquid fertilizer container 30. The effluent of the reaction tank 20 can flow into the liquid fertilizer container 30. The reaction tank 20 can discharge an aqueous solution containing elements such as nitrogen and phosphorus, and the aqueous solution in the liquid fertilizer container 30 can be used as liquid fertilizer.

[0034] The lye storage can be adjacent to the membrane bioreactor. An alkali solution tank 40 is formed in the lye storage. The alkali solution tank 40 can contain an alkaline solution, and the alkaline solution can be potassium hydroxide solution, sodium hydroxide solution, etc. The alkali solution tank 40 and the reaction tank 20 can be located on both sides of the porous hydrophobic membrane 60 respectively. The alkali solution tank 40 and the reaction tank 20 can be connected through the porous hydrophobic membrane 60. The water in the sewage in the reaction tank 20 can flow into the alkali solution tank 40 in the form of water vapor through the porous hydrophobic membrane 60. The water flowing into the alkali solution tank 40 is pure water, which can achieve the effect of supplementing pure water to the alkali solution tank 40. There is a certain concentration difference of water molecules between the interface of the porous hydrophobic membrane 60 and the reaction tank 20 and the interface of the porous hydrophobic membrane 60 and the alkali solution tank 40. The water in the reaction tank 20 can spontaneously flow into the alkali solution tank 40 in the form of water vapor under the action of the concentration difference, so as to realize the directional transportation of the water in the sewage in the reaction tank 20. Only water in the reaction tank 20 can enter the alkali solution tank 40, which can supplement pure water to the electrolytic cell 51. The organic matter in the sewage can be converted into carbon dioxide or methane. Since most of the water in the sewage is used to supplement water to the electrolytic cell 51, the nitrogen and phosphorus concentrations in the sewage increase, and the water flowing into the liquid fertilizer container 30 can be directly used as liquid fertilizer.

[0035] As an example, the membrane bioreactor can be an anaerobic membrane bioreactor. A sludge bed reaction zone can be provided in the reaction tank 20. The sludge bed reaction zone can be arranged from the lower part to the middle part of the reaction tank 20, and the sludge bed reaction zone contains special anaerobic digestion bacteria. The anaerobic digestion bacteria can react with the organic matter in the sewage. After the organic matter is fermented and digested, methane can be produced, and the methane can be discharged from the reaction tank 20 and collected. The water in the sewage in the reaction tank 20 can spontaneously pass through the porous hydrophobic membrane 60 in the form of water vapor, so as to supplement pure water to the electrolytic cell 51. These pure waters can be used for electrolysis to produce hydrogen and oxygen. The reaction tank 20 can discharge an aqueous solution containing substances such as ammonia nitrogen and phosphate, and the discharged aqueous solution can be used as liquid fertilizer.

[0036] As another example, the membrane bioreactor can be an aerobic membrane bioreactor. A sludge bed reaction zone can be provided in the reaction tank 20, and the sludge bed reaction zone can be arranged from the lower part to the middle part of the reaction tank 20. The sludge bed reaction zone contains aerobic activated sludge. The aerobic activated sludge can react with the organic matter in the sewage, and the organic matter is converted into carbon dioxide through the action of microorganisms. The water in the sewage in the reaction tank 20 can spontaneously pass through the porous hydrophobic membrane 60 in the form of water vapor, thereby supplementing pure water for the electrolytic cell 51, and this pure water can be used for electrolysis to produce hydrogen and oxygen. The reaction tank 20 can discharge an aqueous solution containing substances such as nitrate nitrogen and phosphate, and the discharged aqueous solution can be used as liquid fertilizer.

[0037] As an example, by adjusting the area of the porous hydrophobic membrane 60 and the concentration of the alkaline solution in the alkaline solution tank 40, the amount of water in the sewage in the reaction tank 20 flowing into the alkaline solution tank 40 can be adjusted. The amount of water flowing into the alkaline solution tank 40 can be 50%-95% of the inflow amount of the sewage in the reaction tank 20.

[0038] As an example, the membrane bioreactor and the alkaline solution storage can be fixedly connected, the membrane bioreactor and the alkaline solution storage can be constructed as an integral structure, and a porous hydrophobic membrane 60 can be provided between the membrane bioreactor and the alkaline solution storage. The reaction tank 20 can be a cuboid structure with a rectangular cross-section, and the alkaline solution tank 40 can be a cuboid structure with a rectangular cross-section. The reaction tank 20 and the alkaline solution tank 40 can share the same side wall. The side wall of the reaction tank 20 facing the alkaline solution tank 40 and the side wall of the alkaline solution tank 40 facing the reaction tank 20 can be the same, and the porous hydrophobic membrane 60 can be located on this side wall, so that the water in the sewage in the reaction tank 20 can flow into the alkaline solution tank 40.

[0039] The alkaline solution tank 40 can be formed with an alkaline solution tank inlet 41 and an alkaline solution tank outlet 42. The electrolyzer can be used to cause an oxidation-reduction reaction of substances. The electrolyzer forms an electrolytic cell 51. The electrolytic cell 51 can be formed with an electrolytic cell inlet 511 and an electrolytic cell outlet 512. The electrolytic cell 51 can be communicated with the alkaline solution tank 40. The alkaline solution tank outlet 42 can be communicated with the electrolytic cell inlet 511. The alkaline solution in the alkaline solution tank 40 can flow into the electrolytic cell 51 through the alkaline solution tank outlet 42 and the electrolytic cell inlet 511. The electrolyzer can be provided with a power supply 54. The electrolytic positive electrode 52 can be connected to the positive electrode of the power supply 54, and the electrolytic negative electrode 53 can be connected to the negative electrode of the power supply 54. At least part of the electrolytic positive electrode 52 and at least part of the electrolytic negative electrode 53 can be arranged in the electrolytic cell 51, and at least part of the electrolytic positive electrode 52 and at least part of the electrolytic negative electrode 53 extend into the liquid in the electrolytic cell 51, so that the water in the electrolytic cell 51 can undergo an oxidation-reduction reaction. As an example, the power supply 54 can adopt a solar panel to supply power to the electrolytic negative electrode 53 and the electrolytic positive electrode 52 using solar energy, which can save energy.

[0040] When the power supply 54 is energized, water molecules in the electrolytic cell 51 can undergo an oxidation reaction at the electrolytic positive electrode 52 to generate oxygen, and water molecules can undergo a reduction reaction at the electrolytic negative electrode 53 to generate hydrogen. The water in the alkaline solution in the electrolytic cell 51 can be electrolyzed to form oxygen and hydrogen, thereby increasing the concentration of the alkaline solution. And during the entire electrolysis process, the alkaline solution does not participate in the reaction, and the alkaline solution can play a role in enhancing the electrical conductivity of the solution in the electrolytic cell 51, thereby accelerating the rate of electrolyzing water. The alkaline solution can flow back to the alkali solution tank 40 through the electrolytic cell outlet 512 and the alkali solution tank inlet 41, enabling the recycling of the alkaline solution, improving the utilization rate of resources, and reducing costs.

[0041] It should be noted that the preparation of pure water in the prior art is relatively complex. In the embodiment of the present application, the pure water in the reaction tank 20 flows into the alkali solution tank 40 through the porous hydrophobic membrane 60, the pure water is mixed with the alkaline solution in the alkali solution tank 40 and enters the electrolytic cell 51, and the water in the alkaline solution is electrolyzed in the electrolytic cell 51 to generate oxygen and hydrogen. When treating sewage, the water in the sewage can be directly used to electrolyze and generate gas, which can reduce the process of preparing pure water, is beneficial to reducing the process difficulty and cost, and can achieve better recycling of resources.

[0042] In the embodiment of the present application, the gas-producing and fertilizer-producing device 1 can treat sewage. The products after the sewage is treated can be recycled. The water in the sewage can become hydrogen and oxygen, the organic matter in the sewage can become methane, and the nitrogen and phosphorus in the sewage can be concentrated into liquid fertilizer. It can realize the harmlessness and resource utilization of sewage while treating sewage, can realize the recycling of resources, save resources, and protect the environment.

[0043] As an example, the electrolytic cell 51 can also be provided with a hydrogen outlet 5141 and an oxygen outlet 5131. Both the hydrogen outlet 5141 and the oxygen outlet 5131 can be provided at the top of the electrolytic cell 51. The hydrogen outlet 5141 can be provided on one side of the top of the electrolytic cell 51 close to the electrolytic negative electrode 53, and the oxygen outlet 5131 can be provided on one side of the top of the electrolytic cell 51 close to the electrolytic positive electrode 52. The hydrogen outlet 5141 can be communicated with a hydrogen collection bottle, and the oxygen outlet 5131 can be communicated with an oxygen collection bottle, so as to achieve the effect of separately collecting hydrogen and oxygen.

[0044] As an example, a diaphragm 55 that only allows liquids to pass through can be provided in the electrolytic cell 51. The water and alkaline solution in the electrolytic cell 51 can pass through the diaphragm 55, but hydrogen and oxygen cannot pass through the diaphragm 55, thereby reducing the probability of hydrogen and oxygen mixing. The diaphragm 55 can divide the electrolytic cell 51 into a first sub-electrolytic cell 513 and a second sub-electrolytic cell 514. At least a part of the electrolytic positive electrode 52 can be provided in the first sub-electrolytic cell 513, and at least a part of the electrolytic negative electrode 53 can be provided in the second sub-electrolytic cell 514. Water molecules can undergo an oxidation reaction in the first sub-electrolytic cell 513 to generate oxygen, and water molecules can undergo a reduction reaction in the second sub-electrolytic cell 514 to generate hydrogen. The first sub-electrolytic cell 513 has an oxygen outlet 5131, and the first sub-electrolytic cell 513 is communicated with an oxygen collection bottle. The second sub-electrolytic cell 514 has a hydrogen outlet 5141, and the second sub-electrolytic cell 514 is communicated with a hydrogen collection bottle.

[0045] In some embodiments of the present invention, as Figure 1 shown, the membrane bioreactor has a filtration structure 21. The top wall of the reaction tank 20 has a reaction tank water outlet 22. The liquid fertilizer container 30 is communicated with the reaction tank water outlet 22. The filtration structure 21 is located inside the reaction tank 20, so that the water in the sewage in the reaction tank 20 flows through the filtration structure 21 to the reaction tank water outlet 22.

[0046] The membrane bioreactor has a filtration structure 21. The filtration structure 21 can be used to filter impurities in the sewage in the reaction tank 20, and can separate the water and impurities in the reaction tank 20, so that the reaction tank 20 can discharge an aqueous solution containing elements such as nitrogen and phosphorus to the outside. The top wall of the reaction tank 20 can be formed with a reaction tank water outlet 22. A part of the water in the sewage in the reaction tank 20 can flow into the lye tank 40 through the porous hydrophobic membrane 60, and another part of the water in the sewage in the reaction tank 20 can be discharged from the reaction tank 20 through the reaction tank water outlet 22. The liquid fertilizer container 30 is communicated with the reaction tank water outlet 22, and another part of the water in the reaction tank 20 can flow into the liquid fertilizer container 30 through the reaction tank water outlet 22.

[0047] The filtration structure 21 can be located inside the reaction tank 20. When the water in the reaction tank 20 flows out of the reaction tank 20, the water in the sewage in the reaction tank 20 can flow through the filtration structure 21 to the reaction tank water outlet 22. The water in the sewage in the reaction tank 20 can be filtered by the filtration structure 21. The effluent of the reaction tank 20 can be an aqueous solution containing elements such as nitrogen and phosphorus. The effluent of the reaction tank 20 can flow into the liquid fertilizer container 30. Since most of the water in the sewage is used to replenish water for the electrolytic cell 51, the concentration of nitrogen and phosphorus in the sewage in the reaction tank 20 increases, and the water flowing into the liquid fertilizer container 30 can be directly used as liquid fertilizer.

[0048] As an example, a driving pump can be provided between the reaction tank 20 and the liquid fertilizer container 30. The water in the sewage in the reaction tank 20 can flow towards the liquid fertilizer container 30 under the action of the driving pump. When the water in the sewage in the reaction tank 20 flows out of the reaction tank 20 through the reaction tank water outlet 22, the water in the sewage in the reaction tank 20 flows through the filtering structure 21. The water in the sewage in the reaction tank 20 passes through the filter and flows out of the reaction tank 20. The effluent of the reaction tank 20 is an aqueous solution containing nitrogen and phosphorus elements, and the effluent of the reaction tank 20 can be used as liquid fertilizer.

[0049] The filtering structure 21 can be used to filter impurities in the water in the reaction tank 20, and the filtering structure 21 can be a microfiltration membrane. By arranging the filtering structure 21 in the reaction tank 20, the contact area between the filtering structure 21 and the water in the sewage in the reaction tank 20 can be increased, and by adjusting the flow rate of the effluent of the reaction tank 20, the amount of water passing through the filtering structure 21 per unit time per unit area can be reduced, the probability of impurities in the sewage in the reaction tank 20 adhering to the filtering structure 21 can be reduced, and the service life of the filtering structure 21 can be effectively extended.

[0050] In some embodiments of the present invention, the top wall of the reaction tank 20 has a gas outlet, and methane in the reaction tank 20 is discharged from the reaction tank 20 through the gas outlet.

[0051] In this application, the membrane bioreactor is taken as an anaerobic membrane bioreactor for illustration. Anaerobic fermentation digestion bacteria can react with sewage, so that the sewage produces water and methane after fermentation digestion. The water in the sewage can be discharged from the reaction tank 20 through the reaction tank water outlet 22. The top wall of the reaction tank 20 has a gas outlet, and methane in the reaction tank 20 can be discharged from the reaction tank 20 through the gas outlet. The gas production and fertilizer production device 1 can also be provided with a methane collection bottle, and the methane collection bottle can be communicated with the gas outlet. The methane discharged through the gas outlet can flow into the methane collection bottle, so as to achieve the effect of collecting methane, the effect of producing clean energy while treating sewage can be achieved, resource recycling can be realized, and it is beneficial to environmental protection.

[0052] In some embodiments of the present invention, as Figure 1 shown, the gas production and fertilizer production device 1 can further include: a first communication pipe 71 and a first peristaltic pump 72. The first communication pipe 71 communicates the liquid fertilizer container 30 and the reaction tank 20, and the first peristaltic pump 72 and the first communication pipe 71 are cooperatively assembled to pump the water in the sewage in the reaction tank 20 into the liquid fertilizer container 30.

[0053] The first connecting pipe 71 connects the liquid fertilizer container 30 and the reaction tank 20. One end of the first connecting pipe 71 can be connected to the water outlet 22 of the reaction tank, and the other end of the first connecting pipe 71 can extend into the liquid fertilizer container 30, so that the water in the sewage in the reaction tank 20 can flow into the liquid fertilizer container 30, achieving the effect of collecting the aqueous solution containing elements such as nitrogen and phosphorus while treating the sewage. A first peristaltic pump 72 (i.e., the driving pump in the above embodiment) can be provided on the first connecting pipe 71. The first peristaltic pump 72 can pump the water in the sewage in the reaction tank 20 into the liquid fertilizer container 30, and the water in the sewage in the reaction tank 20 flows into the liquid fertilizer container 30 through the first connecting pipe 71. The first peristaltic pump 72 always works, thus achieving the effect of continuously transporting the water in the sewage in the reaction tank 20 to the liquid fertilizer container 30.

[0054] In some embodiments of the present invention, as Figure 1 shown, the gas and fertilizer production device 1 may further include: a second connecting pipe 73 and a second peristaltic pump 74. A reaction tank inlet 23 is formed on the side wall of the reaction tank 20. The reaction tank inlet 23 is formed at the lower end of the side wall of the reaction tank 20. The second connecting pipe 73 connects the feed container 10 and the reaction tank 20, and the second peristaltic pump 74 and the second connecting pipe 73 are assembled in cooperation to pump the sewage in the feed container 10 into the reaction tank 20.

[0055] A sludge bed reaction zone may be provided in the reaction tank 20, and the sludge bed reaction zone may be provided from the bottom to the middle of the reaction tank 20. A reaction tank inlet 23 (i.e., the liquid inlet in the above embodiment) is formed on the side wall of the reaction tank 20. The reaction tank inlet 23 is formed at the lower end of the side wall of the reaction tank 20. Sewage can enter the reaction tank 20 from the lower part of the reaction tank 20, so as to increase the contact area between the sewage and the sludge bed reaction zone in the reaction tank 20 and improve the treatment rate of the sewage.

[0056] The second connecting pipe 73 connects the feed container 10 and the reaction tank 20. One end of the second connecting pipe 73 can be connected to the reaction tank inlet 23, and the other end of the second connecting pipe 73 can extend into the feed container 10, so that the sewage in the feed container 10 can flow into the reaction tank 20. A second peristaltic pump 74 may be provided on the second connecting pipe 73. The second peristaltic pump 74 can pump the sewage in the feed container 10 into the reaction tank 20, and the sewage in the feed container 10 flows into the reaction tank 20 through the second connecting pipe 73, enabling the sewage to be treated in the reaction tank 20.

[0057] In some embodiments of the present invention, as Figure 1As shown, the gas and fertilizer production device 1 may further include: a controller and a liquid level sensor 81. The liquid level sensor 81 is used to detect the liquid level height in the reaction tank 20. The controller is communicatively connected to both the liquid level sensor 81 and the second peristaltic pump 74. The controller is configured to control the operation of the second peristaltic pump 74 according to the liquid level height detected by the liquid level sensor 81.

[0058] The liquid level sensor 81 can be used to detect the liquid level height in the reaction tank 20, and the liquid level sensor 81 can be provided on the side wall of the reaction tank 20. The controller can be communicatively connected to both the liquid level sensor 81 and the second peristaltic pump 74. The liquid level sensor 81 can transmit the detected liquid level height of the reaction tank 20 to the controller, and the controller can control the operation of the second peristaltic pump 74 according to the liquid level height detected by the liquid level sensor 81. When the liquid level height value in the reaction tank 20 is less than the preset height value, the controller controls the second peristaltic pump 74 to operate, and the second peristaltic pump 74 pumps the sewage in the feed container 10 into the reaction tank 20. When the liquid level height value in the reaction tank 20 is greater than or equal to the preset height value, the controller controls the second peristaltic pump 74 to stop operating, and the sewage in the feed container 10 no longer enters the reaction tank 20.

[0059] As an example, there may be two liquid level sensors 81. The two liquid level sensors 81 can both be provided on the side wall of the reaction tank 20, and the two liquid level sensors 81 can be oppositely arranged and spaced apart along the height direction of the reaction tank 20. The upper liquid level sensor 81 can be a high-level sensor, and the lower liquid level sensor 81 can be a low-level sensor. Both the high-level sensor and the low-level sensor can be communicatively connected to the controller, and both the high-level sensor and the low-level sensor can transmit the detected liquid level height to the controller. When the water in the sewage in the reaction tank 20 continuously drains out of the reaction tank 20 and the liquid level height in the reaction tank 20 drops to the set height of the low-level sensor, the low-level sensor transmits the liquid level height of the reaction tank 20 to the controller, and the controller controls the second peristaltic pump 74 to operate. The second peristaltic pump 74 pumps the sewage in the feed container 10 into the reaction tank 20. When the liquid level height in the reactor rises to the set height of the high-level sensor, the high-level sensor transmits the liquid level height of the reaction tank 20 to the controller, and the controller controls the second peristaltic pump 74 to stop operating. The sewage in the feed container 10 no longer enters the reaction tank 20, thereby achieving the effect of automatic feed control, reducing the risk of excessive sewage overflow in the reaction tank 20, and reducing the probability that too little sewage in the reaction tank 20 affects the working efficiency of the gas and fertilizer production device 1.

[0060] As an example, the high-level sensor and the low-level sensor can also be both connected to the same liquid level gauge 82. The high-level sensor and the low-level sensor can both be electrically connected to the liquid level gauge 82, so as to facilitate reading the liquid level height in the reaction tank 20 and facilitate the staff to monitor the amount of liquid in the reaction tank 20. The liquid level gauge 82 can be communicatively connected to the high-level sensor, the low-level sensor, and the controller. The high-level sensor and the low-level sensor can transmit the detected liquid level height to the liquid level gauge 82, and the liquid level gauge 82 can transmit the received liquid level height information to the controller, so as to control the operation of the second peristaltic pump 74 according to the liquid level height of the reaction tank 20.

[0061] In some embodiments of the present invention, as Figure 1 shown, the gas-producing and fertilizer-producing device 1 may further include: a third connecting pipe 75 and a third peristaltic pump 76. The lye tank 40 has a lye tank outlet 42. The third connecting pipe 75 connects the lye tank outlet 42 and the electrolytic cell 51. The third peristaltic pump 76 and the third connecting pipe 75 are assembled in cooperation to pump the alkaline solution in the lye tank 40 into the electrolytic cell 51.

[0062] The lye tank 40 has a lye tank outlet 42 (i.e., the lye tank outlet 42 in the above embodiment). The third connecting pipe 75 connects the lye tank outlet 42 and the electrolytic cell 51. The third connecting pipe 75 can be connected to the first sub-electrolytic cell 513. One end of the third connecting pipe 75 can be connected to the lye tank outlet 42, and the other end of the third connecting pipe 75 can be connected to the electrolytic cell inlet 511, so that the alkaline solution in the lye tank 40 can flow into the electrolytic cell 51 through the lye tank outlet 42 and the electrolytic cell inlet 511. A third peristaltic pump 76 can be provided on the third connecting pipe 75. The third peristaltic pump 76 can pump the alkaline solution in the lye tank 40 into the electrolytic cell 51. The alkaline solution in the lye tank 40 can flow into the electrolytic cell 51 through the third connecting pipe 75. The water in the alkaline solution can be electrolyzed in the electrolytic cell 51 to form oxygen and hydrogen. The third peristaltic pump 76 can be an electric pump, and the third peristaltic pump 76 always works, so as to achieve the effect of continuously transporting the alkaline solution in the lye tank 40 to the electrolytic cell 51.

[0063] In some embodiments of the present invention, as Figure 1 shown, the gas-producing and fertilizer-producing device 1 may further include: a fourth connecting pipe 77. The lye tank 40 has a lye tank inlet 41. The fourth connecting pipe 77 connects the lye tank inlet 41 and the electrolytic cell 51 to enable the alkaline solution in the electrolytic cell 51 to flow into the lye tank 40.

[0064] The lye pool 40 has a lye pool inlet 41 (i.e., the lye pool inlet 41 in the above embodiment). The fourth communication pipe 77 communicates the lye pool inlet 41 and the electrolytic cell 51. The fourth communication pipe 77 can communicate with the second sub-electrolytic cell 514. One end of the fourth communication pipe 77 can be connected to the electrolytic cell outlet 512, and the other end of the fourth communication pipe 77 can be connected to the lye pool inlet 41, so that the alkaline solution in the electrolytic cell 51 can flow back to the lye pool 40 through the electrolytic cell outlet 512 and the lye pool inlet 41. The alkaline solution in the electrolytic cell 51 can flow into the lye pool 40 through the fourth communication pipe 77. The alkaline solution can be mixed with the water flowing into the lye pool 40 from the reaction pool 20. The alkaline solution with reduced concentration after mixing can flow into the electrolytic cell 51 again through the third communication pipe 75, realizing the recycling of the alkaline solution.

[0065] The third communication pipe 75 communicates the lye pool outlet 42 and the electrolytic cell inlet 511. The fourth communication pipe 77 communicates the electrolytic cell outlet 512 and the lye pool inlet 41. The third communication pipe 75, the electrolytic cell 51, the fourth communication pipe 77 and the lye pool 40 can be configured into a loop. The third peristaltic pump 76 can continuously transport the alkaline solution in the lye pool 40 to the electrolytic cell 51. The alkaline solution in the lye pool 40 decreases, and the alkaline solution in the electrolytic cell 51 flows into the lye pool 40 to supplement the alkaline solution in the lye pool 40, realizing the circulating flow of the alkaline solution between the lye pool 40 and the electrolytic cell 51. The alkaline solution is always used to enhance the conductivity of the solution in the electrolytic cell 51, thereby accelerating the rate of electrolyzing water.

[0066] In some embodiments of the present invention, the thickness dimension of the porous hydrophobic membrane 60 is D, satisfying the relationship: 10μm ≤ D ≤ 100μm; and / or a dense hydrophilic layer is provided on the surface of the porous hydrophobic membrane 60 facing the reaction pool 20.

[0067] The thickness dimension of the porous hydrophobic membrane 60 can be in the range of 10μm to 100μm, or a dense hydrophilic layer can be provided on the surface of the porous hydrophobic membrane 60 facing the reaction pool 20, or the thickness dimension of the porous hydrophobic membrane 60 can be in the range of 10μm to 100μm, and a dense hydrophilic layer can be provided on the surface of the porous hydrophobic membrane 60 facing the reaction pool 20. In the embodiments of the present application, the case where the thickness dimension of the porous hydrophobic membrane 60 is in the range of 10μm to 100μm and a dense hydrophilic layer is provided on the surface of the porous hydrophobic membrane 60 facing the reaction pool 20 is taken as an example for illustration.

[0068] Exemplarily, the thickness dimension of the porous hydrophobic membrane 60 can be 10μm, 30μm, 45μm, 70μm, 90μm, 100μm, etc. The thickness dimension of the porous hydrophobic membrane 60 only needs to be within the range of 10μm to 100μm. Any value including the endpoint values is an optional thickness dimension of the porous hydrophobic membrane 60 in the present invention. If the thickness dimension of the porous hydrophobic membrane 60 is less than 10μm, the porous hydrophobic membrane 60 is too thin, and the ability of the porous hydrophobic membrane to resist external forces will be weakened, and damage such as rupture and perforation of the porous hydrophobic membrane 60 is likely to occur during use. If the thickness dimension of the porous hydrophobic membrane 60 is greater than 100μm, the porous hydrophobic membrane 60 is too thick, the diffusion path of the water in the sewage in the reaction tank 20 through the porous hydrophobic membrane 60 becomes longer, and the resistance increases, resulting in a decrease in the water permeation flux of the water in the sewage in the reaction tank 20, affecting the water replenishment rate of the reaction tank 20 to the electrolytic cell 51. Therefore, when the thickness dimension of the porous hydrophobic membrane 60 is between 10μm and 100μm, it can not only make the water in the sewage in the reaction tank 20 pass through the porous hydrophobic membrane 60 at an appropriate speed, enabling the reaction tank 20 to continuously replenish water to the electrolytic cell 51, but also reduce the probability of damage to the porous hydrophobic membrane 60, which is beneficial to extending the service life of the porous hydrophobic membrane 60.

[0069] A dense hydrophilic layer can be coated on the side of the porous hydrophobic membrane 60 facing the reaction tank 20. The hydrophilic layer can be polyvinyl alcohol, polyethylene glycol, etc., so as to increase the anti-wetting ability and anti-pollution ability of the porous hydrophobic membrane 60. As an example, the porous hydrophobic membrane 60 can be provided with a support layer. The support layer can be arranged on the side of the porous hydrophobic membrane 60 facing the lye tank 40, and the support layer can be made of non-woven fabric.

[0070] As an example, the porous hydrophobic membrane 60 can be made of materials such as PVDF (polyvinylidene fluoride), PTFE (polytetrafluoroethylene), PP (polypropylene), etc., all of which have excellent chemical stability and can improve the stability of the porous hydrophobic membrane 60 during use.

[0071] In the embodiment of the present application, when using the gas and fertilizer production device 1 to treat sewage, the sewage is stored in the feed container 10. The controller drives the second peristaltic pump 74 to work, and pumps the sewage in the feed container 10 into the reaction tank 20. When the liquid level height in the reactor rises to the set height of the high-level sensor, the high-level sensor transmits the liquid level height of the reaction tank 20 to the controller, and the controller controls the second peristaltic pump 74 to stop working, and the sewage in the feed container 10 no longer enters the reaction tank 20. The sewage reacts in the reaction tank 20 to generate water and methane, and a part of the water in the sewage in the reaction tank 20 flows out of the reaction tank 20 through the filtering structure 21 from the reaction tank outlet 22. When the water in the sewage in the reaction tank 20 continues to be discharged from the reaction tank 20 and the liquid level height in the reaction tank 20 drops to the set height of the low-level sensor, the low-level sensor transmits the liquid level height of the reaction tank 20 to the controller, and the controller controls the second peristaltic pump 74 to work. The second peristaltic pump 74 pumps the sewage in the feed container 10 into the reaction tank 20 until the liquid level height of the reaction tank 20 rises to the set height of the high-level sensor again, and the second peristaltic pump 74 stops working.

[0072] The first peristaltic pump 72 continuously works, and the first peristaltic pump 72 pumps a part of the water in the sewage in the reaction tank 20 into the liquid fertilizer container 30. Another part of the water in the sewage in the reaction tank 20 flows into the lye tank 40 through the porous hydrophobic membrane 60, and the water entering the lye tank 40 is mixed with the alkaline solution in the lye tank 40. The third peristaltic pump 76 continuously works, and the third peristaltic pump 76 pumps the alkaline solution in the lye tank 40 into the electrolytic cell 51. The water in the alkaline solution in the electrolytic cell 51 is electrolyzed in the electrolytic cell 51 to generate oxygen and hydrogen, and the oxygen and hydrogen are collected. The alkaline solution in the electrolytic cell 51 flows out of the lye tank 40 and returns to the lye tank 40 through the fourth connecting pipe 77, and the alkaline solution can be mixed with the water flowing into the lye tank 40 from the reaction tank 20, and the alkaline solution circulates.

[0073] The other components and operations of the gas and fertilizer production device 1 according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0074] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0075] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A gas and fertilizer producing device, characterized in that, Comprising: A feed container (10) for storing sewage; A membrane bioreactor in which a reaction tank (20) is formed, and the reaction tank (20) is connected to the feed container (10) so that the sewage in the feed container (10) flows into the reaction tank (20); A liquid fertilizer container (30) connected to the reaction tank (20) so that the effluent from the reaction tank (20) flows into the liquid fertilizer container (30); An alkali solution storage and a porous hydrophobic membrane (60), an alkali solution tank (40) is formed in the alkali solution storage, and the alkali solution tank (40) and the reaction tank (20) are respectively located on both sides of the porous hydrophobic membrane (60), so that the water in the sewage in the reaction tank (20) spontaneously passes through the porous hydrophobic membrane (60) in the form of water vapor and flows into the alkali solution tank (40) to supplement pure water for the alkali solution tank (40); An electrolyzer in which an electrolytic cell (51) is formed, and the electrolytic cell (51) is communicated with the alkali solution tank (40) so that the alkaline solution in the alkali solution tank (40) flows into the electrolytic cell (51); An electrolytic positive electrode (52) and an electrolytic negative electrode (53), at least part of the electrolytic positive electrode (52) and at least part of the electrolytic negative electrode (53) are arranged in the electrolytic cell (51) to electrolyze water in the alkaline solution in the electrolytic cell (51) to form oxygen and hydrogen.

2. The gas and fertilizer production device according to claim 1, characterized in that, The membrane bioreactor has a filtering structure (21), the top wall of the reaction tank (20) has a reaction tank water outlet (22), the liquid fertilizer container (30) is communicated with the reaction tank water outlet (22), and the filtering structure (21) is located inside the reaction tank (20) so that the water in the sewage in the reaction tank (20) flows through the filtering structure (21) to the reaction tank water outlet (22).

3. The gas and fertilizer production device according to claim 1, characterized in that, The top wall of the reaction tank (20) has a gas outlet, and methane in the reaction tank (20) is discharged from the reaction tank (20) through the gas outlet.

4. The gas and fertilizer production device according to claim 1, characterized in that, Further comprising: A first connecting pipe (71) and a first peristaltic pump (72), the first connecting pipe (71) connects the liquid fertilizer container (30) and the reaction tank (20), and the first peristaltic pump (72) and the first connecting pipe (71) are cooperatively assembled to pump the water in the sewage in the reaction tank (20) into the liquid fertilizer container (30).

5. The gas and fertilizer production device according to claim 1, characterized in that, Further comprising: A second connecting pipe (73) and a second peristaltic pump (74), a reaction tank inlet (23) is formed on the side wall of the reaction tank (20), the reaction tank inlet (23) is formed at the lower end of the side wall of the reaction tank (20), the second connecting pipe (73) connects the feed container (10) and the reaction tank (20), and the second peristaltic pump (74) and the second connecting pipe (73) are cooperatively assembled to pump the sewage in the feed container (10) into the reaction tank (20).

6. The gas and fertilizer production device according to claim 5, characterized in that, Further comprising: A controller and a liquid level sensor (81), the liquid level sensor (81) is used to detect the liquid level height in the reaction tank (20), the controller is communicatively connected to the liquid level sensor (81) and the second peristaltic pump (74), and the controller is configured to control the operation of the second peristaltic pump (74) according to the liquid level height detected by the liquid level sensor (81).

7. The gas and fertilizer production device according to any one of claims 1-6, characterized in that, It further includes: A third connecting pipe (75) and a third peristaltic pump (76), the alkali solution tank (40) has an alkali solution tank outlet (42), the third connecting pipe (75) connects the alkali solution tank outlet (42) and the electrolytic cell (51), and the third peristaltic pump (76) and the third connecting pipe (75) are cooperatively assembled to pump the alkaline solution in the alkali solution tank (40) into the electrolytic cell (51).

8. The gas and fertilizer production device according to claim 7, characterized in that It further includes: A fourth connecting pipe (77), the alkali solution tank (40) has an alkali solution tank inlet (41), the fourth connecting pipe (77) connects the alkali solution tank inlet (41) and the electrolytic cell (51) to enable the alkaline solution in the electrolytic cell (51) to flow into the alkali solution tank (40).

9. The gas and fertilizer production device according to claim 1, characterized in that The thickness dimension of the porous hydrophobic membrane (60) is D, satisfying the relationship: 10 μm ≤ D ≤ 100 μm; and / or a dense hydrophilic layer is provided on one side surface of the porous hydrophobic membrane (60) facing the reaction tank (20).

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