A device and method for in-situ algae removal in water bodies

Abstract

The application discloses a device and a method for removing algae in-situ in a water body, and the device comprises two floating bodies connected through a connecting rod, the bottom of the floating bodies is respectively connected with a weight, and the surface of the floating bodies is respectively fixed with a solar panel; a driving electrode anode plate and a driving electrode cathode plate are fixed below the connecting rod; one of the floating bodies is internally provided with a motor, the motor is connected with the solar panel together with the driving electrode anode plate and the driving electrode cathode plate; the output shaft of the motor penetrates through the driving electrode anode plate or the driving electrode cathode plate, the front end of the output shaft is fixed with a bipolar electrode plate through titanium wire, the bipolar electrode plate is vertically placed with the driving electrode anode plate and the driving electrode cathode plate, and the bipolar electrode plate is loaded with TiO2 electro-catalytic material. The device and the method have the advantages of simple operation, good algae removal effect, no secondary pollution, good reusability and durability, and significant energy-saving advantage; and can complete in-situ treatment of remote water areas such as lakes, reservoirs and dams.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of in-situ remediation of water bodies, in particular to a device and method for in-situ algae removal of water bodies. BACKGROUND

[0002] The protection and management of water bodies such as lakes and reservoirs have been ongoing and have achieved certain results. The pollution mainly comes from point source pollution and non-point source pollution. Point source pollution is relatively easy to control, but non-point source pollution is widely distributed in space and time and is difficult to monitor, causing serious pollution to water bodies, leading to eutrophication and even harmful algal blooms, which pose a threat to the ecological environment and human health. In the face of this pressing problem of algal blooms, the existing algae removal technologies are not perfect, and various different physical, chemical and biological methods have certain limitations. Developing more efficient algae removal technologies with different advantages and disadvantages and using them in combination can achieve better algae removal effect. There are few studies on the use of electrochemical technology for algae removal, but existing studies have shown that electrochemical oxidation can inactivate algae and has good algae removal effect, and the algae removal effect is mainly related to active oxygen such as ·OH generated by the reaction.

[0003] Three-dimensional electrode electrochemical system refers to adding irregular particle electrodes in the middle of two driven electrodes. The particle electrodes will polarize under the action of the electric field and form micro-electrodes. These particle electrodes can greatly increase the specific surface area of the reaction and provide more active centers for the reaction. The current efficiency and removal efficiency of the three-dimensional electrode system are higher than those of the traditional two-dimensional electrode system. However, the particle electrodes in the three-dimensional electrode system are easily attached by pollutants and lose catalytic activity. The regeneration and replacement operation is complicated, and the particle electrodes are small in size, the polarization voltage formed is small and uncertain, and side reactions are easily generated, reducing the treatment efficiency. SUMMARY

[0004] To solve the above technical problems, the present application provides a device and method for in-situ algae removal of water bodies, which is based on TiO2 electrocatalytic material and bipolar electrode system, and uses a rotating electrode and solar power driving scheme design. It can use solar energy to run on the water surface spontaneously without time and space limitations, simple operation, good algae removal effect, no secondary pollution, good reusability and durability, and significant energy saving advantage. It can complete the in-situ pretreatment or treatment of remote water areas such as lakes, reservoirs and dams.

[0005] To achieve the above purpose, the technical scheme of the present application is as follows:

[0006] The utility model relates to a device for removing algae in water in situ, comprising two floating bodies connected by a connecting rod, the bottom of each floating body is connected to a weight, and the surface of each floating body is fixed with a solar panel; a driving electrode anode plate and a driving electrode cathode plate are fixed below the connecting rod and arranged in parallel; one of the floating bodies is internally provided with a motor electrically connected to the solar panel above it; the driving electrode anode plate and the driving electrode cathode plate are connected to the negative electrode and the positive electrode of the solar panel above the other floating body, respectively; the output shaft of the motor penetrates the driving electrode anode plate or the driving electrode cathode plate, and the front end of the output shaft is fixed with a bipolar electrode plate through a titanium wire, the bipolar electrode plate is arranged perpendicularly to the driving electrode anode plate and the driving electrode cathode plate, and the bipolar electrode plate is loaded with TiO2 electrocatalytic material.

[0007] In the above scheme, the driving electrode anode plate, the driving electrode cathode plate, and the bipolar electrode plate are all graphite plates.

[0008] In the above scheme, the area of the driving electrode anode plate and the driving electrode cathode plate is greater than that of the bipolar electrode plate.

[0009] In the above scheme, the weight of the weight is such that when the bipolar electrode plate is vertical, half of it is submerged in water and half of it is exposed to air.

[0010] In the above scheme, the method for loading TiO2 electrocatalytic material on the bipolar electrode plate is as follows:

[0011] (1) 15 mL of butyl titanate is added to 45 mL of anhydrous ethanol, magnetically stirred for 10 min, 5 g of graphite powder is added, and an A solution is prepared; 6 mL of deionized water and 1.2 mL of nitric acid are added to 45 mL of anhydrous ethanol to prepare a B solution; the B solution is added dropwise to the A solution until the reaction system becomes a gel system that cannot flow, and a gel is obtained; the gel is placed in a blast drying machine and dried at 105℃ for 8 h until the organic solvent is completely volatilized, obtaining a gray powder which is ground into a superfine powder; the powder is placed in a muffle furnace and calcined at 450℃ for two hours to obtain TiO2 electrocatalytic raw material;

[0012] (2) TiO2 electrocatalytic raw material, Na2SO4, and photosensitive resin are mixed in a mass ratio of 8:1:2 and stirred uniformly; they are uniformly coated on a graphite plate and naturally dried for 48-72 h in a place that can be irradiated by sunlight to ensure that the mixture is completely bonded to the graphite plate;

[0013] (3) After curing, the graphite plate is immersed in deionized water for 2 h to remove Na2SO4, obtaining a bipolar electrode plate loaded with TiO2 electrocatalytic material.

[0014] In the above scheme, the motor is fixed in the interior of the floating body after waterproof treatment using a waterproof sleeve, and the motor is connected with the solar panel through wires, and the connection between the motor and the wires is waterproof treated using sealing glue.

[0015] In the above scheme, the periphery of the solar panel is waterproof treated using sealing glue at the contact with the upper surface of the floating body.

[0016] In the above scheme, the output shaft of the motor is insulated at the contact with the driving electrode anode plate or the driving electrode cathode plate using hot melt glue.

[0017] A method for in-situ algae removal in a water body, using the device as described above, comprising the following processes: placing the device in the water body, adjusting the weight to make the bipolar electrode plate half submerged in the water surface and half exposed to the air when vertical; the solar panel provides power for the driving electrode anode plate, the driving electrode cathode plate and the motor, the motor drives the bipolar electrode plate to overturn, the electric field generated by the driving electrode anode plate and the driving electrode cathode plate makes the bipolar electrode plate in the middle generate cathode and anode, and ·OH is generated on the bipolar electrode plate through electrochemical catalytic oxidation for inactivating algae.

[0018] In the above scheme, the way of generating ·OH includes:

[0019] (1) H2O2 is generated on the driving electrode cathode plate, and H2O2 is decomposed into ·OH on the cathode of the bipolar electrode plate;

[0020] (2) ·OH is generated on the cathode of the bipolar electrode plate through three-electron oxygen reduction by using the TiO2 electrocatalytic activity on the cathode of the bipolar electrode plate;

[0021] (3) H2O is directly oxidized to generate ·OH on the anode of the bipolar electrode plate.

[0022] Through the above technical scheme, the device and method for in-situ algae removal in a water body provided by the application have the following beneficial effects:

[0023] (1) The bipolar electrode plate is placed between the driving electrode anode plate and the driving electrode cathode plate, the electric field generated between the driving electrode anode plate and the driving electrode cathode plate is used to make the bipolar electrode plate have cathode and anode at the same time, ·OH is generated through electrochemical catalytic oxidation to inactivate algae, the current efficiency is high, the energy consumption is low, and because the bipolar electrode does not need ohmic contact, multiple electrode arrays can be arranged in the device, and the device has good adaptability to treatment conditions in structure.

[0024] (2) The application utilizes the rotation of the electrode to improve the diffusion of oxygen and the mass transfer of the solution, simplifies the structure of the device, and maintains high reaction efficiency. The weak current and oxygen generated during the electrochemical reaction process can effectively stimulate the metabolic activity of microorganisms and improve the efficiency of biological treatment.

[0025] (3) The bipolar electrode plate of the application is half immersed in the water surface and half exposed to the air when it is vertical. Due to the inertia effect, a layer of liquid film is formed between the electrode surface and the gas phase when the electrode plate is flipped. The liquid film formed can directly connect the gas phase and the electrode surface, improving the utilization rate of oxygen. The continuous update of the substances in the liquid film can improve the mass transfer between the solution and the electrode surface.

[0026] (4) The application has good algae removal effect, simple device, good reusability and durability, small time and space limitation, and no secondary pollution, and can be used for in-situ pretreatment or treatment of remote water areas such as lakes, reservoirs, and dams. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below.

[0028] Figure 1 The structure diagram of the device for removing algae in-situ in water bodies according to the application.

[0029] Figure 2 The structure diagram of the motor connected to the bipolar electrode plate in the application.

[0030] Figure 3 The principle diagram of the device generating ·OH.

[0031] Figure 4 The concentration curve of the device generating ·OH.

[0032] Figure 5 The growth curve of Chlorella vulgaris in Test 1.

[0033] Figure 6 The change graph of the algal density of the control group and the experimental group in Test 1.

[0034] Figure 7 The change graph of the inactivation rate of Chlorella vulgaris in the experimental group in Test 1.

[0035] Figure 8 The change graph of the dissolved oxygen of the control group and the experimental group in Test 1.

[0036] Figure 9 The change graph of the algal density of the control group and the experimental group in Test 2 and the inactivation rate of Chlorella vulgaris in the experimental group in Test 2.

[0037] Figure 10The changes in turbidity in the control group and experimental group in Experiment 2 are shown.

[0038] Figure 11 The pH changes of Chlorella solution in Experiment 1 and Experiment 2 are shown in (a) Experiment 1 and (b) Experiment 2.

[0039] Figure 12 This is a current diagram during device operation.

[0040] In the diagram, 1 is the float; 2 is the connecting rod; 3 is the weight; 4 is the solar panel; 5 is the motor; 6 is the driving electrode anode plate; 7 is the driving electrode cathode plate; 8 is the output shaft; 9 is the titanium wire; 10 is the bipolar electrode plate; 11 is the hot melt adhesive; and 12 is the TiO2 electrocatalytic material. Detailed Implementation

[0041] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0042] This invention provides a device for in-situ algae removal in water bodies, such as... Figure 1 As shown, the system includes two floats 1 connected by a connecting rod 2. Weights 3 are attached to the bottom of each float 1, and solar panels 4 are fixed to the surfaces of each float 1. A motor 5 is installed inside one of the floats 1; in this embodiment, the motor 5 is a variable-speed motor. The motor 5 is electrically connected to the solar panel 4 above its float 1 via wires. A driving electrode anode plate 6 and a driving electrode cathode plate 7 are fixed below the connecting rod 2, arranged in parallel. The driving electrode anode plate 6 and the driving electrode cathode plate 7 are respectively connected to the negative and positive electrodes of the solar panel 4 above the other float 1.

[0043] like Figure 2 As shown, the output shaft 8 of the motor 5 passes through the anode plate 6 or the cathode plate 7 of the driving electrode. A bipolar electrode plate 10 is fixed to the front end of the output shaft 8 via a titanium wire 9. The bipolar electrode plate 10 is placed perpendicular to the anode plate 6 and the cathode plate 7. In this embodiment, to prevent the output shaft 8 of the motor 5 from being anodized, the output shaft 8 is insulated with hot melt adhesive 11 before passing through the cathode plate 7. Placing the bipolar electrode plate 10 between the anode plate 6 and the cathode plate 7 allows the electric field generated between them to simultaneously function as both a cathode and an anode.

[0044] In the embodiment of the present application, the driving electrode anode plate 6, the driving electrode cathode plate 7 and the bipolar electrode plate 10 are all graphite plates. The graphite plate is chemically stable and does not corrode due to current. The upper and lower surfaces of the bipolar electrode plate 10 are both loaded with TiO2 electrocatalytic material 12. The TiO2 electrocatalytic material 12 is in a loose and porous state, which can increase the contact area of the solution and the electrocatalytic material and improve the efficiency.

[0045] The method for loading the TiO2 electrocatalytic material 12 on the bipolar electrode plate 10 is as follows:

[0046] (1) 15 mL of butyl titanate is added to 45 mL of anhydrous ethanol, magnetically stirred for 10 min, 5 g of graphite powder is added, and an A solution is prepared; 6 mL of deionized water and 1.2 mL of nitric acid are added to 45 mL of anhydrous ethanol to prepare a B solution; the B solution is added dropwise to the A solution until the reaction system becomes a gel system that cannot flow, and a gel is obtained; the gel is placed in a forced air drying machine and dried at 105°C for 8 h until the organic solvent is completely volatilized, obtaining a gray powder which is ground into a superfine powder; the powder is placed in a muffle furnace and calcined at 450°C for two hours to obtain TiO2 electrocatalytic raw material;

[0047] (2) The TiO2 electrocatalytic raw material, Na2SO4 and photosensitive resin are mixed and stirred uniformly at a mass ratio of 8:1:2; they are uniformly coated on the graphite plate and placed in a place where sunlight can be irradiated for natural drying for 60 hours to ensure that the mixture is completely bonded to the graphite plate;

[0048] (3) After curing, the graphite plate is immersed in deionized water for 2 hours to remove Na2SO4, and a bipolar electrode plate 10 loaded with TiO2 electrocatalytic material is obtained.

[0049] The driving electrode anode plate 6 and the driving electrode cathode plate 7 are rectangular plates, and the bipolar electrode plate 10 is also a rectangular plate. The length and width of the driving electrode anode plate 6 and the driving electrode cathode plate 7 are both greater than the length and width of the bipolar electrode plate 10, so as to ensure that the generated electric field completely covers the bipolar electrode plate 10. The two ends of the bipolar electrode plate 10 are kept a certain distance from the two driving electrodes, so that sunlight can irradiate the bipolar electrode plate. In this embodiment, the size of the driving electrode anode plate 6 and the driving electrode cathode plate 7 is 5.0 cm x 8.0 x 0.3 cm. The size of the bipolar electrode plate 10 is 4.0 cm x 2.5 cm x 0.3 cm. The distance between the driving electrode anode plate 6 and the driving electrode cathode plate 7 is 6.0 cm.

[0050] In this embodiment, the material of the floating body 1 is a pearl cotton foam plate with a size of 8.0 cm x 9.0 cm x 4.0 cm. The pearl cotton plate has low density, good toughness and low conductivity, which can provide sufficient buoyancy and facilitate the fixation of components.

[0051] In this embodiment, two solar panels 4, parameters are 80x80mm, 6V, 150mA and 60x60mm, 2V, 100mA, are fixed above two floating bodies 1 respectively. The motor 5 is connected with the 6V solar panel 4 through wires, and the rotating speed is about 150rpm. The upper end of the driving electrode anode plate 6 and the driving electrode cathode plate 7 is connected with the 2V solar panel 4 through wires.

[0052] In this embodiment, the weight 3 can use stones, and the weight of the weight 3 is such that when the bipolar electrode plate 10 is vertical, half is immersed in the water surface and half is exposed to the air. When the bipolar electrode plate 10 is turned over, a layer of liquid film is formed between the electrode surface and the gas phase due to the inertial effect, which can directly connect the gas phase and the electrode surface to improve the oxygen utilization rate, and the continuous update of the substances in the liquid film can improve the mass transfer between the solution and the electrode surface.

[0053] After the motor 5 is waterproofed with a waterproof sleeve, it is fixed inside the floating body 1. The motor 5 is connected with the solar panel 4 through wires, and the connection between the two ends of the motor 5 and the wires is waterproofed with sealing glue. The contact between the four sides of the solar panel 4 and the upper surface of the floating body 1 is waterproofed with sealing glue. All the seals are treated with organic silicone sealing glue.

[0054] A method for in-situ algae removal in water bodies, using the above device, includes the following processes: placing the device in the water body, adjusting the weight 3 so that when the bipolar electrode plate 10 is vertical, half is immersed in the water surface and half is exposed to the air; the solar panel 4 provides power for the driving electrode anode plate 6, the driving electrode cathode plate 7 and the motor 5, the motor 5 drives the bipolar electrode plate 10 to turn over, the electric field generated by the driving electrode anode plate 6 and the driving electrode cathode plate 7 makes the bipolar electrode plate 10 in the middle generate cathode and anode, and ·OH is generated on the bipolar electrode plate 10 by electrochemical catalytic oxidation for inactivating algae.

[0055] As shown in the specific working principle, the ways of generating ·OH include: Figure 3

[0056] (1) H2O2 is generated on the driving electrode cathode plate, and H2O2 is decomposed into ·OH on the cathode of the bipolar electrode plate;

[0057] (2) ·OH is generated on the cathode of the bipolar electrode plate by three-electron oxygen reduction through the TiO2 electrocatalytic activity on the cathode of the bipolar electrode plate;

[0058] (3) H2O is directly oxidized to generate ·OH on the anode of the bipolar electrode plate.

[0059] During the reaction process, the TiO2 electrocatalytic raw material on the cathode of the bipolar electrode behaves as a kind of electro-Fenton reaction, and the reaction process is as shown in the following figure: ​

[0060] Cathode: H2O2 + Ti 3+ → OH - + ·OH + Ti 4+

[0061] Ti 4+ + e - → Ti 3+

[0062] TiO2 electrocatalytic raw material on the anode of the bipolar electrode plate behaves as an anodic oxidation reaction, and the reaction process is as shown below:

[0063] Anode: H2O - e - → ·OH + H +

[0064] Meanwhile, electrochemical redox reactions occur on the anode plate and the cathode plate of the driving electrode.

[0065] 1. Verification test of ·OH produced by the device:

[0066] 0.05M Na2SO4 solution is used as an electrolyte, and electron paramagnetic resonance spectroscopy and high-performance liquid chromatography with salicylic acid as a probe are used to qualitatively and quantitatively determine the active oxygen groups produced by the device, as shown in Figure 4 As time goes on, the device can produce high concentrations of ·OH.

[0067] 2. Algae inactivation test:

[0068] Test 1: Inactivate the ordinary Chlorella with an initial algae density of about 7x10 6 cells / mL by using the above device.

[0069] The ordinary Chlorella (Chlorella vulgaris) FACHB-8 from the Algae Culture Collection of the Chinese Academy of Sciences is used as the model organism for the experiment, and the Chlorella is a common water bloom algae. The Chlorella is expanded using BG-11 medium, and the triangular flask after inoculation is placed in a laboratory constant-temperature incubator for culture, with a running speed of 140 rpm, a temperature of 25℃±1℃, a light intensity of 12000lx, and a light / dark cycle of 12h / 12h. The Chlorella growth curve is as shown in Figure 5 .

[0070] Chlorella inactivation effect determination method: algae density and dissolved oxygen change.

[0071] Experimental steps: select Chlorella liquid in the logarithmic growth phase, and measure the algae density.

[0072] Set up a control group and an experimental group, with the same volume and concentration of algae liquid, the same environment, and the experimental group being placed in the device of the application, and the control group being blank.

[0073] The experimental algae liquid was configured with a total volume of 600 mL, containing 100 mL of BG-11 medium.

[0074] Before the experiment, the initial algae cell density, reactor current, dissolved oxygen, pH and turbidity were measured. After the experiment started, the algae density, dissolved oxygen, pH and turbidity of the two groups of algae liquid were measured at 9:00 am and 6:00 pm every day, and the temperature was recorded; after 6:00 pm, the experimental device was placed in a dark environment and the two groups of experimental devices were covered with tin foil paper, and after 9:00 am, the experimental device was placed in the sunlight and the tin foil paper was collected. Continuous observation and measurement, stop when the algae density decreases slowly.

[0075] The initial algae density was about 7×10 6 cells / mL, and the change of algae density of the experimental group and the control group was as shown in Figure 6 The inactivation rate of Chlorella vulgaris in the experimental group calculated with the control group as a reference was as shown in Figure 7 The change of dissolved oxygen was as shown in Figure 8 The algae density of the Chlorella vulgaris liquid treated by the device decreased to 2.8×10 6 cells / mL on the 7th day, a decrease of 55.2% compared with the initial algae density, and the inactivation rate reached about 65% on the 6th and 7th days. The dissolved oxygen curve of the control group showed great fluctuations, while the dissolved oxygen curve of the experimental group fluctuated less. After 16 days of treatment, the dissolved oxygen concentration of the control group was almost unchanged, and the dissolved oxygen concentration of the experimental group decreased to 3.2 mg / L, a decrease of 60% compared with the initial value. The results showed that under the conditions of sufficient nutrition, sufficient light and suitable temperature, the device can inactivate Chlorella vulgaris in high-concentration algae liquid with good effect.

[0076] Test 2: Inactivate Chlorella vulgaris with an initial algae density of about 2.5×10 6 cells / mL using the above device.

[0077] The experimental method was the same as (1), and the change of algae density and inactivation rate was as shown in Figure 9 The experimental results were consistent with (1), and the algae density of the experimental group decreased by 55% compared with the initial algae density on the 7th day, and the inactivation rate reached about 60% on the 6th and 7th days. The influence of chance on the experimental results was ruled out. For algae liquid with different concentrations exceeding the severe algal bloom standard, the reactor had good algae inactivation effect, and the inactivation rate was similar, about 60%.

[0078] The change of turbidity of the control group and the experimental group was as shown in Figure 10 It can be seen that the turbidity value is steadily decreasing, and on the 7th day, it decreases by about 50.8% compared with the initial turbidity, and by about 34% compared with the control group on the 7th day, which is consistent with the observation of algae density.

[0079] In Test 1 and Test 2, the pH of the Chlorella vulgaris liquid changed asFigure 11 As shown in the figure, in both experiments, the pH of the control group and the experimental group was basically stable at 7.0-9.0, which was suitable for the growth of Chlorella, and the influence of pH on the growth of Chlorella was excluded.

[0080] 3. Device energy consumption test

[0081] The Ag / AgCl electrode was used as the reference electrode, and the voltage of the anode plate and the cathode plate of the driving electrode was detected by the multimeter, the anode voltage was 1.3V, and the cathode voltage was-0.6V. Then the current value of the reactor when running in the algae liquid was measured by the electrochemical workstation, and the current measurement results are shown in the figure. Figure 12

[0082] The current value was relatively stable after 10 minutes of continuous measurement, and 0.09mA was roughly taken as the average current value. The specific energy consumption was calculated according to the following formula.

[0083]

[0084] Among them, E SP is the specific energy consumption (KW h m -3 ), I is the current intensity (A), U is the potential (V), T is the processing time (H), E is the energy consumption of the motor rotation (KW h), and V is the volume of the treated water (m 3 ).

[0085] The voltage and current of the motor rotation were 6V and 68mA respectively, the processing time was 7 days, and the specific energy consumption was calculated to be 114.29KW h m -3 , of which 99.9% of the energy consumption was used for the motor rotation, and the energy consumption of the device electrocatalytic reaction was only 0.05KW hm -3 .

[0086] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.​

Claims

1. A method for removing algae in-situ in a water body using a device for removing algae in-situ in a water body, characterized in that, The device comprises two floating bodies connected by a connecting rod, the bottoms of the two floating bodies are respectively connected with weights, and the surfaces of the two floating bodies are respectively fixed with solar panels; a driving electrode anode plate and a driving electrode cathode plate are fixed below the connecting rod, and the driving electrode anode plate and the driving electrode cathode plate are arranged in parallel; one of the floating bodies is internally provided with a motor, the motor is electrically connected with the solar panel above the floating body; the driving electrode anode plate and the driving electrode cathode plate are respectively connected with the negative electrode and the positive electrode of the solar panel above the other floating body; the output shaft of the motor penetrates through the driving electrode anode plate or the driving electrode cathode plate, the front end of the output shaft is fixed with a bipolar electrode plate through titanium wire, the bipolar electrode plate is arranged perpendicularly to the driving electrode anode plate and the driving electrode cathode plate, and the bipolar electrode plate is loaded with TiO2 electrocatalytic material; the parameters of the two solar panels are respectively 80*80mm, 6V, 150mA and 60*60mm, 2V, 100mA, and the two solar panels are respectively fixed above the two floating bodies; the motor is connected with the 6V solar panel through a wire, and the upper ends of the driving electrode anode plate and the driving electrode cathode plate are connected with the 2V solar panel through a wire. The method comprises the following process: placing the device in a water body, adjusting the weights so that the bipolar electrode plate is half submerged in the water surface and half exposed to the air when the bipolar electrode plate is vertical; the solar panels provide power for the driving electrode anode plate, the driving electrode cathode plate and the motor, the motor drives the bipolar electrode plate to overturn, the electric field generated by the driving electrode anode plate and the driving electrode cathode plate makes the bipolar electrode plate generate cathode and anode, and ·OH is generated on the bipolar electrode plate through electrochemical catalytic oxidation, which is used for inactivating algae. The method for generating ·OH comprises: (1) generating H2O2 on the driving electrode cathode plate, and decomposing H2O2 into ·OH on the cathode of the bipolar electrode plate; (2) generating ·OH on the cathode of the bipolar electrode plate through three-electron oxygen reduction by using the TiO2 electrocatalytic activity of the cathode of the bipolar electrode plate; (3) directly oxidizing H2O into ·OH on the anode of the bipolar electrode plate.

2. The method for removing algae in-situ in a water body according to claim 1, characterized in that, The driving electrode anode plate, the driving electrode cathode plate and the bipolar electrode plate are all graphite plates.

3. The method for removing algae in-situ in a water body according to claim 1, characterized in that, The areas of the driving electrode anode plate and the driving electrode cathode plate are both larger than the area of the bipolar electrode plate.

4. The method for removing algae in-situ in a water body according to claim 1, characterized in that, The weight of the weight makes the bipolar electrode plate half submerged in the water surface and half exposed to the air when the bipolar electrode plate is vertical.

5. The method for removing algae in-situ in a water body according to claim 1, characterized in that, The method for loading TiO2 electrocatalytic material on the bipolar electrode plate is as follows: (1) adding 15mL butyl titanate into 45mL anhydrous ethanol, magnetically stirring for 10min, adding 5g graphite powder to prepare an A solution; adding 6mL deionized water and 1.2mL nitric acid into 45mL anhydrous ethanol to prepare a B solution; adding the B solution drop by drop into the A solution until the reaction system becomes a gel system that cannot flow, obtaining a gel; placing the gel in a blast drying machine and drying at 105℃ for 8h until the organic solvent is completely volatilized, obtaining a gray powder, which is ground into a superfine powder; placing the powder in a muffle furnace and calcining at 450℃ for two hours, obtaining TiO2 electrocatalytic raw material; (2) TiO2 electrocatalytic raw materials, Na2SO4 and photosensitive resin are mixed and stirred uniformly at a mass ratio of 8:1:2; the mixture is uniformly coated on a graphite plate and placed in a place that can be irradiated by sunlight for natural drying for 48-72 hours to ensure that the mixture is completely bonded to the graphite plate; (3) After curing, the graphite plate is immersed in deionized water for 2 hours to remove Na2SO4, and a bipolar electrode plate loaded with TiO2 electrocatalytic material is obtained.

6. The method for removing algae in-situ in a water body according to claim 1, characterized in that, The motor is fixed inside the floating body after waterproof treatment using a waterproof sleeve, and the motor is connected to the solar panel through wires. The connection between the motor and the wires is waterproofed using sealant.

7. The method for removing algae in-situ in a water body according to claim 1, characterized in that, The periphery of the solar panel is waterproofed using sealant at the contact with the upper surface of the floating body. 8.The method for removing algae in-situ in a water body according to claim 1, characterized in that, The output shaft of the motor is insulated at the contact with the driving electrode anode plate or the driving electrode cathode plate using hot melt adhesive.

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