Device and method for controlling algae abundance in natural water bodies based on dual photosynthesis

Abstract

The present invention relates to a device and method for controlling algae abundance in natural water bodies based on dual photosynthesis. The device is used to monitor and regulate the abundance of microalgae in the water body. The device comprises a photocatalytically coupled dual-chamber microalgae biofuel cell and a water quality monitoring sensor. The photocatalytically coupled dual-chamber microalgae biofuel cell comprises an anode chamber and a cathode chamber, which are connected by a connecting assembly. The anode chamber is equipped with a photocatalytic microalgae composite anode, a light source, and a stirring paddle, while the cathode chamber is equipped with a microalgae biocathode, algae liquid, and a stirring paddle. The connecting assembly includes a proton exchange membrane. One end of the water quality monitoring sensor is connected to the water body, and the other end is connected to the cathode chamber. The water quality monitoring sensor is used to monitor the abundance of microalgae in the water body and the cathode chamber. The device purifies natural river water and alleviates microalgae outbreaks in river water. The device can dynamically control the abundance of microalgae 24 hours a day.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment and environmental protection, and in particular to a device and method for controlling algae abundance in natural water bodies based on dual photosynthesis. Background Art

[0002] Human activities such as agriculture, industry, sewers and wastewater production lead to the generation of wastewater. The global annual wastewater production is about 2212 km 3 , equivalent to 56% of annual freshwater withdrawals. Wastewater discharged into rivers can lead to eutrophication, trigger algae blooms, and have harmful effects on aquatic life and human health. As wastewater discharge becomes increasingly serious, the ecological environment surrounding rivers and the daily lives of residents are seriously threatened, becoming a controlling factor that restricts the sustainable development of society and human survival. Therefore, specific processes are needed to treat polluted water bodies.

[0003] Energy is one of the most critical resources used in water treatment. According to statistics, electricity consumption for wastewater treatment accounts for approximately 4% of the world's total energy. This energy-intensive process is often accompanied by significant carbon emissions. In the context of achieving carbon neutrality, traditional water treatment processes, with their high energy consumption, high costs, and greenhouse gas emissions, are no longer able to meet the demands of sustainable development. The combined pressures of the energy crisis, water pollution, and the need for carbon neutrality are forcing traditional water treatment processes to urgently upgrade.

[0004] Currently, photocatalysis (PC) and microbial fuel cell (MFC) technologies have become emerging wastewater treatment technologies. PC technology is highly efficient in treating water bodies, but is not suitable for treating wastewater with complex components. MFC technology, on the other hand, can simultaneously degrade and mineralize multiple pollutants through the domestication of high-performance microorganisms, and can also generate electricity for output, but the treatment time required is relatively long. In recent years, the combined application of multiple technical approaches has gradually become a research hotspot for pollutant control. The photocatalytic-microbial fuel cell (PC-MFC) coupling technology utilizes the in-situ or indirect oxidation of organic pollutants by catalytic materials under illumination and the biodegradation and mineralization of multiple components in wastewater by microorganisms, or promotes the separation of photogenerated electrons and holes in the PC system catalytic materials through electricity generation by the MFC system, achieving efficient degradation and resource utilization of target pollutants, providing new ideas for the development of environmentally friendly wastewater treatment technologies. Summary of the Invention

[0005] The purpose of the present invention is to provide a device and method for controlling the abundance of algae in natural water bodies based on dual photosynthesis, to purify natural river water and improve the problem of microalgae outbreaks in river water. The control device provided by the present invention involves a photocatalytic microalgae electrode, which can dynamically control the abundance of microalgae 24 hours a day.

[0006] Developing and designing more efficient MFC systems for wastewater treatment has always been a key issue. This invention proposes a device for controlling and purifying algae blooms in natural water bodies, utilizing "dual photosynthesis." This device, which utilizes both artificial and natural photosynthesis, effectively regulates the abundance of microalgae in water bodies 24 hours a day, maintaining water health while also generating sufficient electricity to power water quality monitoring sensors. The device can be applied to controlling algae pollution in natural rivers, lakes, and artificial landscape water bodies.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A natural water algae abundance control device based on dual photosynthesis, the control device is used to monitor and regulate the abundance of microalgae in the water body, the control device includes a photocatalytic coupled dual-chamber microalgae biofuel cell and a water quality monitoring sensor,

[0009] The photocatalytic coupled dual-chamber microalgae biofuel cell comprises an anode chamber and a cathode chamber, wherein the anode chamber and the cathode chamber are connected via a connecting assembly.

[0010] The anode chamber is provided with a photocatalytic microalgae composite anode, a light source and a stirring paddle. The photocatalytic microalgae composite anode and the light source are arranged at intervals in the anode chamber. The photocatalytic microalgae composite anode and the light source are connected to the top of the anode chamber. The stirring paddle is arranged at the bottom of the anode chamber. The anode chamber is connected to the water body.

[0011] The cathode chamber is provided with a microalgae bio-cathode, algae liquid and a stirring paddle. The microalgae bio-cathode is provided on one side of the cathode chamber, the algae liquid is filled in the cathode chamber, the stirring paddle is provided at the bottom of the cathode chamber, and the photocatalytic microalgae composite anode is electrically connected to the microalgae bio-cathode.

[0012] The connecting assembly includes a proton exchange membrane, one end of the proton exchange membrane is connected to the anode chamber, and the other end of the proton exchange membrane is connected to the cathode chamber.

[0013] One end of the water quality monitoring sensor is connected to the water body, and the other end of the water quality monitoring sensor is connected to the cathode chamber. The water quality monitoring sensor is used to monitor the abundance of microalgae in the water body and the cathode chamber.

[0014] Furthermore, the photocatalytic coupled dual-chamber microalgae biofuel cell also includes a capacitor, which is electrically connected to the photocatalytic microalgae composite anode and the microalgae biocathode through an electrical conductor. The capacitor is also electrically connected to the light source and is used to power the light source.

[0015] Furthermore, the water quality monitoring sensor is externally connected to a first water quality monitoring sensor probe and a second water quality monitoring sensor probe, and the water quality monitoring sensor is electrically connected to the capacitor, the first water quality monitoring sensor probe and the second water quality monitoring sensor probe. The capacitor is also used to power the water quality monitoring sensor. The first water quality monitoring sensor probe is used to monitor the abundance of microalgae in the water body, and the second water quality monitoring sensor probe is used to monitor the abundance of microalgae in the algae liquid in the cathode chamber.

[0016] Furthermore, the photocatalytic microalgae composite anode consists of a base electrode, a photocatalytic coating and microalgae. Photocatalytic coatings are provided on both sides of the base electrode, one side of the photocatalytic coating is connected to the base electrode, and microalgae are provided on the other side of the photocatalytic coating.

[0017] Furthermore, the bottom ends of the anode chamber and the cathode chamber are connected via a first connecting water pipe, and a second water pump is provided on the first connecting water pipe;

[0018] The top ends of the anode chamber and the cathode chamber are connected via a gas connecting pipe, and the gas connecting pipe is used to discharge the carbon dioxide gas generated in the anode chamber to the cathode chamber.

[0019] Furthermore, a second connecting water pipe is provided at the upper end of the anode chamber, a second gate valve is provided on the second connecting water pipe, a third connecting water pipe is provided at the lower end of the anode chamber, a first water pump is provided on the third connecting water pipe, the second connecting water pipe and the third connecting water pipe are both connected to the water body, the second connecting water pipe is used for water intake, and the third connecting water pipe is used for water drainage.

[0020] Furthermore, a cathode chamber exhaust port is provided at the top of the cathode chamber, and the second water quality monitoring sensor probe passes through the cathode chamber exhaust port.

[0021] A fourth connecting water pipe is provided at the bottom end of the cathode chamber, and a first gate valve is provided on the fourth connecting water pipe.

[0022] Furthermore, the light source is an LED light source, and a quartz sleeve is provided outside the light source.

[0023] In addition, the present invention also provides a method for controlling algae abundance in natural water bodies based on dual photosynthesis, which is performed using the above-mentioned control device, and the specific steps are as follows:

[0024] S1. The water quality monitoring sensor detects the abundance of microalgae in the water. When the abundance of microalgae exceeds the set standard value, the water enters the anode chamber, the stirring paddle is started, and the water comes into contact with the photocatalytic microalgae composite anode.

[0025] S2. During the day, the photocatalytic microalgae composite anode generates holes and electrons after being irradiated by light. The electrons are transported to the microalgae biological cathode through the electrical conductor, and the holes migrate to the surface of the photocatalytic microalgae composite anode, forming hydroxyl radicals with hydroxide ions in the water, oxidizing and decomposing organic and inorganic pollutants in the water, and killing harmful microorganisms and algae. The generated protons pass through the proton exchange membrane to reach the cathode chamber;

[0026] S3. The algae liquid in the cathode chamber undergoes biological photosynthesis, producing oxygen that combines with the protons obtained in step S2 to form water, thereby driving the protons in the anode chamber to continuously enter the cathode chamber. The above process generates continuous electrical energy, which is stored in the capacitor;

[0027] At night, the capacitor continuously releases the electrical energy stored during the day, providing electrical energy to activate the light source in the anode chamber, driving the photocatalytic microalgae composite anode to continue working, oxidizing and decomposing inorganic and organic pollutants and microorganisms in the water.

[0028] S5. The water treated in the anode chamber is discharged into the water body, so that the biomass of polluting algae in the water body is always in a low abundance range;

[0029] S6. When the abundance of microalgae in the water body reaches the safety numerical standard, the control device stops operating.

[0030] Furthermore, in step S1, the water quality monitoring sensor performs real-time monitoring and analysis of the abundance of microalgae in the water by analyzing the chlorophyll concentration.

[0031] Furthermore, in step S1, the photocatalytic microalgae composite anode material is Chlorella vulgaris / k + -C3N4 / TiO2 / C, wherein C is the base electrode material, and the k + -C3N4 / TiO2 is a photocatalytic coating material, and the Chlorella is a microalgae material.

[0032] Furthermore, in step S2, the purified product carbon dioxide gas is discharged into the cathode chamber through the gas connecting pipe.

[0033] Furthermore, in step S2, the microalgae biocathode material is made of carbon paper.

[0034] Furthermore, in step S3, the microalgae species in the algae liquid in the cathode chamber are selected from cyanobacteria, dinoflagellates or green algae.

[0035] The working mechanism of the present invention is as follows:

[0036] The water quality monitoring sensor detects the abundance of microalgae in the water. When the abundance of microalgae exceeds the set standard value, the first water pump starts to pump water into the anode chamber, and the stirring paddle starts at the same time to ensure that the pollutants in the water are fully mixed and the water is fully in contact with the photocatalytic microalgae composite anode.

[0037] During the day, the photocatalytic microalgae composite anode is irradiated by light to generate photogenerated holes and electrons, which is the first photosynthesis ("artificial photosynthesis"). The separated electrons are transported to the microalgae biological cathode through the electrical conductor, while the holes migrate to the surface of the photocatalytic microalgae composite anode material and react with hydroxide ions in the water to form hydroxyl radicals, which oxidize and decompose organic and inorganic pollutants in the water and kill harmful microorganisms and algae. The generated product, carbon dioxide gas, is discharged into the cathode chamber through the gas connecting pipe. The protons generated during the purification process of the polluted water in the anode chamber reach the cathode chamber through the proton exchange membrane;

[0038] At the same time, the algae liquid in the cathode chamber undergoes biological photosynthesis, that is, the second photosynthesis, producing oxygen to provide electron acceptors for the reduction reaction in the cathode chamber, which combines with the protons entering from the anode chamber to generate water, thereby driving the protons in the anode chamber to continuously enter the cathode chamber. The above action process generates continuous electrical energy, which is stored in the capacitor.

[0039] At night, the capacitor continuously releases the electrical energy stored during the day, providing electrical energy to start the light source in the anode chamber, driving the photocatalytic microalgae composite anode to continue working, oxidizing and decomposing inorganic and organic pollutants and microorganisms in the water; the water treated in the anode chamber is discharged into the water body through the second connecting water pipe, so that the biomass of polluting algae in natural water bodies such as rivers and lakes is always in a low abundance range, thereby eliminating algae bloom pollution in natural water bodies.

[0040] When the abundance of microalgae in the water reaches a safe numerical standard, the control device stops operating.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] (1) Real-time monitoring of the abundance of microalgae in natural water bodies, and the device can be started to dynamically adjust the abundance of microalgae according to water quality requirements; during the day, natural river water is transported to the anode chamber of the device, and the visible light source causes the photocatalytic microalgae composite anode to undergo a separation reaction of photogenerated holes and electrons, and the photogenerated holes kill the microalgae in the water body, and the photogenerated electrons flow from the photocatalytic microalgae composite anode plate through the electrical conductor to the microalgae biological cathode plate to generate electricity; at night, the collected electricity is used to power the LED light source, which serves as an artificial light source for the device to continue working, so that the photocatalytic microalgae composite anode continues to generate photogenerated holes and electrons, and the photogenerated holes kill the microalgae in the water body, ensuring that the water body is continuously purified; the collected electricity also powers the water quality monitoring sensor, maintaining the self-powered water quality monitoring system in all-weather operation.

[0043] (2) Self-sufficient energy consumption: The system can operate 24 hours a day and generate electricity. The electricity generated by the system while treating wastewater is sufficient to supply the UV lamp and monitoring system for effective operation. The entire device is almost energy-free and has no secondary pollution.

[0044] (3) High-efficiency organic pollutant treatment combined with dynamic algae control: While dynamically regulating the abundance of aquatic polluting algae, it can simultaneously treat a variety of organic pollutants and inorganic pollutants such as ammonia nitrogen and nitrite in the water body, maintaining long-term healthy and stable water quality;

[0045] (4) Improve material performance: The system is equipped with a high-efficiency photocatalytic microalgae composite anode and connected to a microalgae biological cathode, which provides a driving force for photogeneration and electron separation for the photocatalytic microalgae composite anode, inhibits the recombination of hole-electron pairs in the photocatalytic material, and enables efficient treatment of water bodies;

[0046] (5) Achieve zero or negative greenhouse gas emissions during system operation.

[0047] (6) The present invention utilizes microalgae and MFC technology (microalgae-type MFC) for organic combination, adds microalgae to the cathode chamber of the MFC, and uses it as an electron acceptor, which can avoid waste of resources, reduce the construction cost of the MFC, and improve the stability of operation. The O2 produced by microalgae through photosynthesis provides an electron acceptor for the MFC, avoiding mechanical aeration and reducing energy consumption; in addition, studies have found that microalgae themselves also generate a large amount of charge during photosynthesis, which can be used to construct a microalgae photocatalytic composite anode to further improve the efficiency of power generation. At the same time, microalgae can make full use of the organic matter in the wastewater to synthesize the organic matter required for its own growth, thereby improving the MFC system's ability to remove pollutants such as COD, nitrogen, and phosphorus. Applying microalgae biocathode MFC technology to wastewater treatment can not only treat organic matter in the wastewater, but also fix CO2 through photosynthesis in the cathode chamber of the microalgae, making full use of organic phosphorus, nitrogen and other substances required for growth, achieving the dual effects of carbon fixation and purification of nutrient-rich wastewater.

[0048] (7) Compared with the patent "Method for in-situ driven electro-Fenton degradation of red tide / water bloom algae by sediment-type microbial fuel cells based on water sediment" (202011420278.6), the present invention innovatively designs a microalgae composite photocatalytic anode, which can degrade organic pollutants while controlling the abundance of microorganisms in the water body, thereby improving the treatment efficiency; compared with the patent "A reactor and wastewater treatment method of a directly coupled membrane bioreactor and microbial fuel cell" (201210081071.X), the present invention independently creates a microalgae composite photocatalytic anode, which not only degrades difficult-to-degrade organic pollutants in wastewater, but also degrades inorganic pollutants such as ammonia nitrogen and nitrite and elements such as organic nitrogen and phosphorus in the water body, and degrades a wider range of pollutants; compared with the patent "An internally guided bacteria-algae integrated microbial fuel cell ecological water purification system" (201810010493.5), this system can kill algae more efficiently and achieves effective control of the abundance of polluting algae in the water body. ; Compared with the patent "A fuel cell system that can simultaneously generate electricity and degrade organic pollutants" (202211028323.2), the present invention has the advantage of using microalgae to consume fixed carbon dioxide to achieve zero or negative carbon emissions; compared with the patent "Device for efficient removal of volatile organic pollutants by photocatalytic microbial fuel cells" (202010128590.1), this system adds algae-containing water as an electrolyte in the cathode chamber, which can biodegrade elements such as nitrogen and phosphorus in the water; compared with the patent "A floating sandwich-type electro-Fenton food waste wastewater treatment device and method" (202310423802.2), this system has self-power generation function, more energy-saving advantages and wider applicable scenarios; compared with the patent "A device and method for treating sewage with a bacterial and algal bioelectrochemical system using a light-transmitting conductive biological cathode" (202210008565.9), this system can work continuously day and night, and can realize 24-hour all-weather treatment of wastewater, and the treatment efficiency is doubled. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of the overall structure of the device of the present invention;

[0050] Figure 2 is a side view of the device of the present invention;

[0051] Figure 3 A top view of the device of the present invention;

[0052] Figure 4 This is an enlarged schematic diagram of the photocatalytic microalgae composite anode in the device of the present invention.

[0053] Explanation of the accompanying numbers: 1. Photocatalytic microalgae composite anode, 1-1. Base electrode, 1-2. Photocatalytic coating, 1-3. Microalgae, 2. Water body, 3. First connecting water pipe, 4. Microalgae biocathode, 5. Quartz sleeve, 6. Light source, 7. Gas connecting pipe, 8. Stirring paddle, 9. First water pump, 10. Anode chamber, 11. Second water pump, 12. First gate valve, 18. Second gate valve, 13. Cathode chamber, 14. Cathode chamber exhaust port, 15. Algae liquid, 16. Electrical conductor, 17. Capacitor, 19. Water quality monitoring sensor, 20. First water quality monitoring sensor probe, 21. Second water quality monitoring sensor probe, 22. Proton exchange membrane, 23. Second connecting water pipe, 24. Third connecting water pipe, 25. Fourth connecting water pipe. DETAILED DESCRIPTION

[0054] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0055] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0056] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0058] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0059] Example 1

[0060] See also Figures 1 to 4 This embodiment provides a natural water algae abundance control device based on dual photosynthesis, the control device is used to monitor and regulate the abundance of microalgae in the water body 2, the control device includes a photocatalytic coupled dual-chamber microalgae biofuel cell and a water quality monitoring sensor 19,

[0061] The photocatalytic coupled dual-chamber microalgae biofuel cell comprises an anode chamber 10 and a cathode chamber 13, wherein the anode chamber 10 and the cathode chamber 13 are connected via a connecting assembly.

[0062] The anode chamber 10 is provided with a photocatalytic microalgae composite anode 1, a light source 6 and a stirring paddle 8. The photocatalytic microalgae composite anode 1 and the light source 6 are arranged at intervals in the anode chamber 10. The photocatalytic microalgae composite anode 1 and the light source 6 are connected to the top of the anode chamber 10. The stirring paddle 8 is arranged at the bottom of the anode chamber 10. The anode chamber 10 is connected to the water body 2.

[0063] The cathode chamber 13 is provided with a microalgae biocathode 4, algae liquid 15 and a stirring paddle 8. The microalgae biocathode 4 is provided on one side of the cathode chamber 13. The algae liquid 15 is filled in the cathode chamber 13. The stirring paddle 8 is provided at the bottom of the cathode chamber 13. The photocatalytic microalgae composite anode 1 is electrically connected to the microalgae biocathode 4.

[0064] The connecting assembly includes a proton exchange membrane 22, one end of the proton exchange membrane 22 is connected to the anode chamber 10, and the other end of the proton exchange membrane 22 is connected to the cathode chamber 13.

[0065] One end of the water quality monitoring sensor 19 is connected to the water body 2 , and the other end of the water quality monitoring sensor 19 is connected to the cathode chamber 13 . The water quality monitoring sensor 19 is used to monitor the abundance of microalgae in the water body 2 and the cathode chamber 13 .

[0066] In this embodiment, the photocatalytic coupled dual-chamber microalgae biofuel cell also includes a capacitor 17, which is electrically connected to the photocatalytic microalgae composite anode 1 and the microalgae biocathode 4 through an electrical conductor 16. The capacitor 17 is also electrically connected to the light source 6, and the capacitor 17 is used to power the light source 6.

[0067] In the present embodiment, the water quality monitoring sensor 19 is externally connected to a first water quality monitoring sensor probe 20 and a second water quality monitoring sensor probe 21. The water quality monitoring sensor 19 is electrically connected to the capacitor 17, the first water quality monitoring sensor probe 20 and the second water quality monitoring sensor probe 21. The capacitor 17 is also used to power the water quality monitoring sensor 19. The first water quality monitoring sensor probe 20 is used to monitor the abundance of microalgae in the water body 2, and the second water quality monitoring sensor probe 21 is used to monitor the abundance of microalgae in the algae liquid 15 in the cathode chamber 13.

[0068] In this embodiment, the photocatalytic microalgae composite anode 1 is composed of a base electrode 1-1, a photocatalytic coating 1-2 and microalgae 1-3. Photocatalytic coatings 1-2 are provided on both sides of the base electrode 1-1. One side of the photocatalytic coating 1-2 is connected to the base electrode 1-1, and microalgae 1-3 is provided on the other side of the photocatalytic coating 1-2.

[0069] In this embodiment, the bottom ends of the anode chamber 10 and the cathode chamber 13 are connected via a first connecting water pipe 3 , and a second water pump 11 is provided on the first connecting water pipe 3 ;

[0070] The top ends of the anode chamber 10 and the cathode chamber 13 are connected via a gas connecting pipe 7 , and the gas connecting pipe 7 is used to discharge the carbon dioxide gas generated in the anode chamber 10 to the cathode chamber 13 .

[0071] In this embodiment, a second connecting water pipe 23 is provided at the upper end of the anode chamber 10, and a second gate valve 18 is provided on the second connecting water pipe 23. A third connecting water pipe 24 is provided at the lower end of the anode chamber 10, and a first water pump 9 is provided on the third connecting water pipe 24. The second connecting water pipe 23 and the third connecting water pipe 24 are both connected to the water body 2, the second connecting water pipe 23 is used for water intake, and the third connecting water pipe 24 is used for drainage.

[0072] In this embodiment, a cathode chamber exhaust port 14 is provided at the top of the cathode chamber 13, and the second water quality monitoring sensor probe 21 passes through the cathode chamber exhaust port 14.

[0073] A fourth connecting water pipe 25 is provided at the bottom end of the cathode chamber 13 , and a first gate valve 12 is provided on the fourth connecting water pipe 25 .

[0074] In this embodiment, the light source 6 is an LED light source, and a quartz sleeve 5 is provided outside the light source 6 .

[0075] In addition, this embodiment also provides a method for controlling algae abundance in natural water bodies based on dual photosynthesis, which is performed using the above-mentioned control device. The specific steps are as follows:

[0076] S1, the water quality monitoring sensor 19 detects the abundance of microalgae in the water body 2. When the abundance of microalgae exceeds the set standard value, the water body 2 enters the anode chamber 10, the stirring paddle 8 is started, and the water body contacts the photocatalytic microalgae composite anode 1.

[0077] S2. During the day, the photocatalytic microalgae composite anode 1 generates holes and electrons after being irradiated by light. The electrons are transported to the microalgae biocathode 4 through the electrical conductor 16, and the holes migrate to the surface of the photocatalytic microalgae composite anode 1, forming hydroxyl radicals with hydroxide ions in the water, oxidizing and decomposing organic and inorganic pollutants in the water, and killing harmful microorganisms and algae. The generated protons pass through the proton exchange membrane 22 and reach the cathode chamber 13;

[0078] S3: The algae liquid 15 in the cathode chamber 13 undergoes biological photosynthesis, producing oxygen that combines with the protons obtained in step S2 to form water, thereby driving the protons in the anode chamber 10 to continuously enter the cathode chamber. The above process generates continuous electrical energy, which is stored in the capacitor 17.

[0079] S4. At night, the capacitor 17 continuously releases the electrical energy stored during the day to provide electrical energy to activate the light source 6 in the anode chamber 10, driving the photocatalytic microalgae composite anode 1 to continue working, oxidizing and decomposing inorganic and organic pollutants and microorganisms in the water;

[0080] S5. The water treated by the anode chamber 10 is discharged into the water body 2, so that the biomass of the polluting algae in the water body 2 is always in a low abundance range;

[0081] S6. When the abundance of microalgae in the water body 2 reaches a safe numerical standard, the control device stops operating.

[0082] In this embodiment, in step S1 , the water quality monitoring sensor 19 performs real-time monitoring and analysis of the abundance of microalgae in the water body 2 by analyzing the chlorophyll concentration.

[0083] In this embodiment, in step S1, the photocatalytic microalgae composite anode 1 material is Chlorella vulgaris / k + -C3N4 / TiO2 / C, wherein C is the material of the substrate electrode 1-1, and the k + -C3N4 / TiO2 is the material of the photocatalytic coating 1-2, the Chlorella is the microalgae 1-3 material, and the photocatalytic microalgae composite anode 1 is composited using existing technology.

[0084] In this embodiment, in step S2 , the purified product carbon dioxide gas is discharged into the cathode chamber 13 through the gas connecting pipe 7 .

[0085] In this embodiment, in step S2, the microalgae biocathode 4 is made of carbon paper.

[0086] In this embodiment, in step S3, the microalgae species in the algae liquid 15 in the cathode chamber 13 are selected from cyanobacteria, dinoflagellates or green algae.

[0087] Example 2 Long-term landscape water algae pollution control

[0088] A water surface area of ​​about 800m in southern Shanghai 2 A natural landscape pond with a water storage capacity of approximately 1,300 cubic meters is characterized by a high abundance of green algae and some algal blooms. To address this water treatment need, this embodiment provides a natural water algae abundance control device based on dual photosynthesis, suitable for long-term and safe maintenance of natural river water quality. The control device is made of acrylic.

[0089] The anode chamber 10 of the control device has a volume of 0.6m 3 The base electrode 1-1 is 6 pieces of carbon fiber plates with a size of 1000mm*500mm*5mm, which are loaded with k + -C3N4 / TiO2 photocatalytic coating 1-2, and after immersion culture in a pond for 7 days, loading microalgae 1-3 to obtain a photocatalytic microalgae composite anode 1, and installing the photocatalytic microalgae composite anode 1 in the anode chamber 10;

[0090] The cathode chamber 13 of the control device has a volume of 0.6 m 3 , the microalgae biocathode 4 plate is a piece of carbon paper with a size of 1000mm*500mm*1mm, fixedly installed in the cathode chamber 13;

[0091] The proton exchange membrane 22 of the control device is made of perfluorooctane sulfonic acid and has a size of 500mm*500mm*0.2mm;

[0092] The light source 6 of the control device is composed of three 3W blue light beads and three 3W 254nm wavelength ultraviolet LED lamp tubes;

[0093] The capacitor 17 of the control device is selected to have a capacity of 800F super capacitor.

[0094] In addition, this embodiment also provides a method for controlling algae abundance in natural water bodies based on dual photosynthesis, which is performed using the above-mentioned control device. The specific steps are as follows:

[0095] The first water quality monitoring sensor probe 20 of the water quality monitoring sensor 19 arranged in the pond detects and analyzes the water quality indicators of the water body. When it is detected that the chlorophyll concentration in the water body to be treated exceeds the standard, the control device is started, and the first water pump 9 simultaneously pumps pond water filtered by a 100-mesh filter into the anode chamber 10. Then, the algae and organic pollutants in the water body quickly react with each other on the surface of the photocatalytic microalgae composite anode 1 plate. The polluted algae in the water are killed, and the organic matter is decomposed and discharged back to the pond. This process runs continuously day and night. After 7 days of continuous operation, the algae abundance reaches the standard, and the control device stops running and remains in standby mode.

[0096] In the two years since the control device was put into operation, the water quality of the landscape pond has consistently met the national water quality standards for Class III water bodies. Powered by light and biomass energy, the control device operates automatically, achieving long-term dynamic purification of algae pollutants, ammonia nitrogen, and nitrite in natural water bodies, effectively ensuring the ecological safety of natural water bodies.

[0097] Example 3: Mobile emergency restoration of algae pollution in natural rivers

[0098] This embodiment provides a device for controlling algae abundance in natural water bodies based on dual photosynthesis. The device is a vehicle-mounted, mobile photocatalytically coupled dual-chamber microalgae fuel cell natural river water treatment device. It was used on a 1.1-kilometer-long scenic river in Jiaxing, Zhejiang Province, where a cyanobacteria outbreak occurred. The vehicle-mounted, mobile device consists of a stainless steel body with an acrylic skylight and a photocatalytically coupled dual-chamber microalgae fuel cell device.

[0099] The anode chamber 10 of the control device has a volume of 2.1 m 3 The base electrode 1-1 is 10 pieces of carbon fiber plates with a size of 1000mm*500mm*5mm, which are loaded with Chlorella vulgaris prepared by sol-gel method. + -C3N4 / TiO2 photocatalyst film layer to obtain a photocatalytic microalgae composite anode 1, and install the photocatalytic microalgae composite anode 1 in the anode chamber 10;

[0100] The cathode chamber 13 of the control device has a volume of 0.6 m 3 , the microalgae biocathode 4 plate is a piece of carbon paper with a size of 1000mm*500mm*1mm, fixedly installed in the cathode chamber 13;

[0101] The proton exchange membrane 22 of the control device is made of perfluorooctane sulfonic acid and has a size of 500mm*500mm*0.2mm;

[0102] The light source 6 of the control device is 10 each of 3W blue light beads and 3W 254nm wavelength ultraviolet LED lamp tubes;

[0103] The capacitor 17 of the control device is selected to have a capacity of 800F super capacitor.

[0104] After the control device worked day and night for 48 hours, the blue-green algae-polluted water quality of the landscape river returned to the algae abundance of Class III water bodies, and no blue-green algae bloom occurred in the following quarter.

[0105] After the water quality of the river is restored, the vehicle-mounted mobile photocatalytic coupled dual-chamber microalgae fuel cell in the above embodiment is recovered, cleaned and maintained, and then used in various sudden algae pollution of natural and artificial landscape water bodies and water sources, demonstrating the advantages of easy arrival at the scene, rapid startup, and efficient and thorough treatment.

[0106] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A natural water algae abundance control device based on dual photosynthesis, the control device is used to monitor and regulate the abundance of microalgae in the water body (2), characterized in that: The control device includes a photocatalytic coupled dual-chamber microalgae biofuel cell and a water quality monitoring sensor (19), The photocatalytic coupled dual-chamber microalgae biofuel cell comprises an anode chamber (10) and a cathode chamber (13), wherein the anode chamber (10) and the cathode chamber (13) are connected via a connecting assembly. The anode chamber (10) is provided with a photocatalytic microalgae composite anode (1), a light source (6) and a stirring paddle (8); the photocatalytic microalgae composite anode (1) and the light source (6) are arranged at intervals in the anode chamber (10); the photocatalytic microalgae composite anode (1) and the light source (6) are connected to the top end of the anode chamber (10); the stirring paddle (8) is arranged at the bottom end of the anode chamber (10); the anode chamber (10) is connected to the water body (2); The cathode chamber (13) is provided with a microalgae biocathode (4), algae liquid (15) and a stirring paddle (8); the microalgae biocathode (4) is provided on one side of the cathode chamber (13); the algae liquid (15) is filled in the cathode chamber (13); the stirring paddle (8) is provided at the bottom end of the cathode chamber (13); the photocatalytic microalgae composite anode (1) is electrically connected to the microalgae biocathode (4); The connecting assembly includes a proton exchange membrane (22), one end of the proton exchange membrane (22) is connected to the anode chamber (10), and the other end of the proton exchange membrane (22) is connected to the cathode chamber (13). One end of the water quality monitoring sensor (19) is connected to the water body (2), and the other end of the water quality monitoring sensor (19) is connected to the cathode chamber (13). The water quality monitoring sensor (19) is used to monitor the abundance of microalgae in the water body (2) and the cathode chamber (13).

2. The natural water algae abundance control device based on dual photosynthesis according to claim 1, characterized in that: The photocatalytic coupled dual-chamber microalgae biofuel cell further comprises a capacitor (17), wherein the capacitor (17) is electrically connected to the photocatalytic microalgae composite anode (1) and the microalgae biocathode (4) via an electrical conductor (16), and the capacitor (17) is also electrically connected to the light source (6), and the capacitor (17) is used to supply power to the light source (6).

3. The natural water algae abundance control device based on dual photosynthesis according to claim 2, characterized in that: The water quality monitoring sensor (19) is externally connected to a first water quality monitoring sensor probe (20) and a second water quality monitoring sensor probe (21); the water quality monitoring sensor (19) is electrically connected to the capacitor (17), the first water quality monitoring sensor probe (20), and the second water quality monitoring sensor probe (21); the capacitor (17) is also used to supply power to the water quality monitoring sensor (19); the first water quality monitoring sensor probe (20) is used to monitor the abundance of microalgae in the water body (2); and the second water quality monitoring sensor probe (21) is used to monitor the abundance of microalgae in the algae liquid (15) in the cathode chamber (13).

4. The natural water algae abundance control device based on dual photosynthesis according to claim 1, characterized in that: The photocatalytic microalgae composite anode (1) consists of a base electrode (1-1), a photocatalytic coating (1-2) and microalgae (1-3); the base electrode (1-1) is provided with a photocatalytic coating (1-2) on both sides; one side of the photocatalytic coating (1-2) is connected to the base electrode (1-1); and the other side of the photocatalytic coating (1-2) is provided with microalgae (1-3).

5. The natural water algae abundance control device based on dual photosynthesis according to claim 1, characterized in that: The bottom ends of the anode chamber (10) and the cathode chamber (13) are connected via a first connecting water pipe (3), and a second water pump (11) is provided on the first connecting water pipe (3); The top ends of the anode chamber (10) and the cathode chamber (13) are connected via a gas connecting pipe (7), and the gas connecting pipe (7) is used to discharge the carbon dioxide gas generated in the anode chamber (10) to the cathode chamber (13).

6. The natural water algae abundance control device based on dual photosynthesis according to claim 3, characterized in that: A second connecting water pipe (23) is provided at the upper end of the anode chamber (10), and a second gate valve (18) is provided on the second connecting water pipe (23). A third connecting water pipe (24) is provided at the lower end of the anode chamber (10), and a first water pump (9) is provided on the third connecting water pipe (24). Both the second connecting water pipe (23) and the third connecting water pipe (24) are connected to the water body (2). The second connecting water pipe (23) is used for water intake, and the third connecting water pipe (24) is used for water discharge. A cathode chamber exhaust port (14) is provided at the top of the cathode chamber (13), and the second water quality monitoring sensor probe (21) passes through the cathode chamber exhaust port (14). A fourth connecting water pipe (25) is provided at the bottom end of the cathode chamber (13), and a first gate valve (12) is provided on the fourth connecting water pipe (25).

7. The natural water algae abundance control device based on dual photosynthesis according to claim 1, characterized in that: The light source (6) is an LED light source, and a quartz sleeve (5) is provided outside the light source (6).

8. A method for controlling algae abundance in natural water bodies based on dual photosynthesis, characterized in that: The method is performed using the control device according to any one of claims 1 to 7, and the specific steps are as follows: S1, the water quality monitoring sensor (19) detects the abundance of microalgae in the water body (2). When the abundance of microalgae exceeds the set standard value, the water body (2) enters the anode chamber (10), the stirring paddle (8) is started, and the water body contacts the photocatalytic microalgae composite anode (1). S2. During the day, the photocatalytic microalgae composite anode (1) generates holes and electrons after being irradiated by light. The electrons are transported to the microalgae biological cathode (4) through the electrical conductor (16), and the holes migrate to the surface of the photocatalytic microalgae composite anode (1), and form hydroxyl radicals with hydroxide ions in the water, oxidizing and decomposing organic and inorganic pollutants in the water, and killing harmful microorganisms and algae, and generating protons that pass through the proton exchange membrane (22) to reach the cathode chamber (13); S3, the algae liquid (15) in the cathode chamber (13) undergoes biological photosynthesis, generating oxygen that combines with the protons obtained in step S2 to generate water, thereby driving the protons in the anode chamber (10) to continuously enter the cathode chamber. The above-mentioned process generates continuous electrical energy, which is stored in the capacitor (17); S4. At night, the capacitor (17) continuously releases the electrical energy stored during the day, providing electrical energy to activate the light source (6) in the anode chamber (10), driving the photocatalytic microalgae composite anode (1) to continue working, oxidizing and decomposing inorganic and organic pollutants and microorganisms in the water body; S5, the water treated by the anode chamber (10) is discharged into the water body (2), so that the biomass of the polluting algae in the water body (2) is always in a low abundance range; S6. When the abundance of microalgae in the water body (2) reaches a safe numerical standard, the control device stops operating.

9. The method for controlling algae abundance in natural water bodies based on dual photosynthesis according to claim 8, characterized in that: In step S1, the water quality monitoring sensor (19) performs real-time monitoring and analysis of the abundance of microalgae in the water body (2) by analyzing the chlorophyll concentration; The photocatalytic microalgae composite anode (1) material is Chlorella vulgaris / k + -C3N4 / TiO2 / C, wherein C is the base electrode (1-1) material, and the k + -C3N4 / TiO2 is the photocatalytic coating material (1-2), and the Chlorella is the microalgae material (1-3).

10. The method for controlling algae abundance in natural water bodies based on dual photosynthesis according to claim 8, characterized in that: In step S2, the purified carbon dioxide gas is discharged into the cathode chamber (13) through the gas connecting pipe (7); The microalgae biocathode (4) is made of carbon paper; In step S3, the microalgae species in the algae liquid (15) in the cathode chamber (13) are selected from cyanobacteria, dinoflagellates or green algae.

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