A floating tailwater treatment system

Abstract

This invention relates to the technical field of aquaculture wastewater treatment, and more specifically, to a floating wastewater treatment system, comprising a float, a tank located on top of the float, and a solar power generation device. The tank has an inlet and an outlet at both ends, with a pump at the inlet. A first unidirectional flow guide plate is located inside the tank, and an electrochemical adsorption zone and a microbial-algae symbiotic zone are located on either side of the first unidirectional flow guide plate. The electrochemical adsorption zone is connected to the inlet through a primary adsorption zone. The microbial-algae symbiotic zone includes a cation reaction zone, an anion reaction zone, and two storage tanks, which are connected to the outlet through the cation and anion reaction zones, respectively. The solar power generation device includes a connected photovoltaic panel and a battery. The photovoltaic panel is located on top of the float, and the battery is located on top of the electrochemical adsorption zone. The pump, the anode, and the cathode in the electrochemical adsorption zone are connected to the battery. The various zones within the tank are independent of each other, facilitating cleaning and subsequent maintenance during use.

Description

Technical Field

[0001] This invention relates to the technical field of aquaculture wastewater treatment, and more specifically, to a floating wastewater treatment system. Background Technology

[0002] The quality of water in pond fish farming directly affects the profitability of the aquaculture. Besides sufficient water volume, adequate water quality is crucial. Only by ensuring water quality can the healthy growth of fish be promoted and large-scale fish mortality effectively avoided. In ponds with high adult fish yields or shallow, small ponds with dense fish populations and fertile water, water quality is prone to deterioration, with high levels of ammonia nitrogen and nitrite negatively impacting aquaculture.

[0003] The prior art discloses an electroactive algae symbiotic reactor and its system and application. The reactor includes a shell; a fixed central shaft with one end connected to one end of the shell and the other end extending toward the other end of the shell; and a bioanode, a flow guide baffle, and a biocathode sequentially arranged along the fixed central shaft. The flow guide baffle divides the shell into an anode region and a cathode region. The bioanode includes an anode located on the fixed central shaft, an anode wire located at the end of the anode away from the flow guide baffle, and an electroactive algae symbiotic anode biofilm attached to the anode. The biocathode includes a cathode located on the fixed central shaft, a cathode wire located at the end of the cathode near the flow guide baffle, and an electroactive algae symbiotic cathode biofilm attached to the cathode. The anode wire and the cathode wire are connected by an external resistor. Both the electroactive algae symbiotic anode biofilm and the electroactive algae symbiotic cathode biofilm include electroactive mixed bacteria and algae. In this design, to ensure that water enters the shell, the anode area is located below the water surface, and part of the anode area is embedded in the bottom sediment area. Furthermore, the electroactive algae symbiotic cathode biofilm and the electroactive algae symbiotic anode biofilm are attached to the cathode of the cathode area and the anode of the anode area, respectively, which makes cleaning and subsequent maintenance during use inconvenient. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies in terms of inconvenience in cleaning and subsequent maintenance during use, and to provide a floating tailwater treatment system in which each structure can be independently disassembled and assembled, facilitating cleaning and subsequent maintenance during use.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] A floating wastewater treatment system is provided, comprising a float plate, a tank disposed on top of the float plate, and a solar power generation device. One end of the tank is provided with an inlet and a water pump, and the other end of the tank is provided with an outlet. Inside the tank is a first unidirectional flow guide plate, which forms an electrochemical adsorption zone and a primary adsorption zone with one end of the tank. The electrochemical adsorption zone is connected to the inlet through the primary adsorption zone. An anode and a cathode are provided within the electrochemical adsorption zone. The first unidirectional flow guide plate forms a bacterial-algae symbiotic zone with the other end of the tank. The solar power generation device includes a connected photovoltaic panel and a storage battery. The photovoltaic panel is located on top of the floating plate, and the storage battery is located on top of the electrochemical adsorption zone. The water pump, anode, and cathode are respectively connected to the storage battery. The algae-bacteria symbiotic zone is divided into a cation reaction zone, a storage zone, and an anion reaction zone by two partitions. The storage zone located between the two partitions is equipped with two storage tanks, which are respectively connected to the cation reaction zone and the anion reaction zone. The cation reaction zone and the anion reaction zone are respectively connected to the water outlet.

[0007] The floating tailwater treatment system of this invention floats on the water surface via a float plate. A photovoltaic panel absorbs solar energy and converts it into light energy, which is stored in a battery. The battery supplies power to a water pump, anode, and cathode. The water pump pumps the tailwater into a primary adsorption zone for preliminary treatment. Then, in the electrochemical adsorption zone, pollutant ions in the water are separated into cations and anions. The water flow containing cations and the water flow containing anions enter the cation reaction zone and the anion reaction zone respectively through a first unidirectional guide plate. Two storage tanks supply different bacterial and algal solutions to the cation reaction zone and the anion reaction zone respectively. In the cation reaction zone and the anion reaction zone, the different bacterial and algal solutions react with the pollutants in the water flow to remove ions. Finally, the water flows out of the tank from the outlet, completing the tailwater treatment. In this invention, the box is divided into a primary adsorption zone, an electrochemical adsorption zone, and a bacterial-algae symbiotic zone. The bacterial-algae symbiotic zone is further divided into a cation reaction zone, a storage zone, and an anion reaction zone by a partition. The battery is located at the top of the electrochemical adsorption zone to prevent obstruction of the primary adsorption zone and the bacterial-algae symbiotic zone. Each zone is independent of the others, which facilitates cleaning and subsequent maintenance during use.

[0008] Furthermore, a primary packing frame and a primary adsorption component filled within the primary packing frame are provided in the primary adsorption zone. The primary adsorption component is used to adsorb macromolecular pollutants, and the primary packing frame is slidably connected to the housing.

[0009] Furthermore, a second one-way flow guide plate is provided inside the box. One side of the second one-way flow guide plate forms the algae-bacteria symbiotic zone with the first one-way flow guide plate, and the other side of the second one-way flow guide plate forms a tail adsorption zone with the box. The cation reaction zone and the anion reaction zone are respectively connected to the water outlet through the tail adsorption zone.

[0010] Furthermore, a tail filler frame and a tail adsorption component filled in the tail filler frame are provided in the tail adsorption area, and the tail filler frame can be removed from the tail adsorption area.

[0011] Furthermore, the tail adsorption component is a porous composite structure comprising bird zeolite, activated carbon, and crushed oyster shells.

[0012] Furthermore, the partition is provided with a first valve, the liquid storage tank is provided with a second valve that can be connected to the first valve, the bottom of the liquid storage tank is provided with a push-button switch for controlling the opening and closing of the second valve, and the algae-bacteria symbiotic area is provided with two protrusions, the two protrusions respectively corresponding to the two push-button switches.

[0013] Furthermore, sensors for sensing water flow are respectively provided in the cation reaction zone and the anion reaction zone, the battery is connected to the sensors, and the first valve is communicatively connected to the sensors.

[0014] Furthermore, an air pump is provided in both the cation reaction zone and the anion reaction zone, and the battery is connected to the air pump.

[0015] Furthermore, both the cation reaction zone and the anion reaction zone are filled with a carbon source and titanium dioxide.

[0016] Furthermore, the top of the cation reaction zone and the anion reaction zone is provided with a cover plate, which is a light-transmitting structure.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows:

[0018] 1. The electrochemical adsorption zone and the algae-bacterial symbiosis zone are divided into two parts inside the chamber by the first unidirectional flow guide plate. The algae-bacterial symbiosis zone is further divided into a cation reaction zone, a liquid storage zone, and an anion reaction zone by a partition. Each zone is independent of the others, which facilitates cleaning during use and subsequent maintenance.

[0019] 2. Preliminary treatment of effluent can be carried out in the primary adsorption zone to remove large molecular pollutants from the water;

[0020] 3. Further treatment of the effluent can be carried out in the tail adsorption zone to remove nitrogen and phosphorus from the water. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the floating tailwater treatment system in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the primary packing frame in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the floating tailwater treatment system when the solar power generation device is removed in an embodiment of the present invention.

[0024] In the attached diagram: 1-1-Float plate; 2-Box body; 3-Inlet; 4-Primary adsorption zone; 401-Primary packing frame; 5-Electrochemical adsorption zone; 6-First unidirectional guide plate; 7-Baffle; 8-Cation reaction zone; 9-Anion reaction zone; 10-Storage tank; 11-Second unidirectional guide plate; 12-Tail adsorption zone; 13-Outlet; 14-Photovoltaic panel; 15-Battery. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Example 1

[0028] This embodiment is the first embodiment of a floating tailwater treatment system, such as... Figure 1 , Figure 3As shown, the device includes a floating plate 1, a tank 2 located on top of the floating plate 1, and a solar power generation device. One end of the tank 2 has a water inlet 3 equipped with a water pump, and the other end has a water outlet 13. Inside the tank 2 is a first unidirectional flow guide plate 6, which forms an electrochemical adsorption zone 5 and a primary adsorption zone 4 with one end of the tank 2. The electrochemical adsorption zone 5 is connected to the water inlet 3 through the primary adsorption zone 4. An anode and a cathode are located within the electrochemical adsorption zone 5. The first unidirectional flow guide plate 6 forms a bacterial-algae symbiotic zone with the other end of the tank 2. The solar power generation device... The device includes a connected photovoltaic panel 14 and a storage battery 15. The photovoltaic panel 14 is located on the top of the floating plate 1, and the storage battery 15 is located on the top of the electrochemical adsorption zone 5. The water pump, anode, and cathode are respectively connected to the storage battery 15. The algae-bacteria symbiotic zone is divided into a cation reaction zone 8, a liquid storage zone, and an anion reaction zone 9 by two partitions 7. The liquid storage zone located between the two partitions 7 is equipped with two liquid storage tanks 10. The two liquid storage tanks 10 are respectively connected to the cation reaction zone 8 and the anion reaction zone 9. The cation reaction zone 8 and the anion reaction zone 9 are respectively connected to the water outlet 13.

[0029] In the above-mentioned floating tailwater treatment system, the system floats on the water surface via a float plate 1. The photovoltaic panel 14 absorbs solar energy and converts it into light energy, which is stored in the battery 15. The battery 15 supplies power to the water pump, anode, and cathode. The water pump is used to pump the tailwater into the primary adsorption zone 4 for preliminary treatment. Then, in the electrochemical adsorption zone 5, the pollutant ions in the water are separated into cations and anions. The water flow containing cations and the water flow containing anions enter the cation reaction zone 8 and the anion reaction zone 9 respectively through the first one-way guide plate 6. The two storage tanks 10 supply different bacterial and algal solutions to the cation reaction zone 8 and the anion reaction zone 9 respectively. In the cation reaction zone 8 and the anion reaction zone 9, the pollutants in the water flow react with the different bacterial and algal solutions to remove the ions in the water flow. Finally, the water flows out of the tank 2 from the outlet 13, completing the tailwater treatment. In this embodiment, the box 2 is divided into a primary adsorption zone 4, an electrochemical adsorption zone 5, and a bacterial-algae symbiotic zone. The bacterial-algae symbiotic zone is further divided into a cation reaction zone 8, a liquid storage zone, and an anion reaction zone 9 by a partition 7. The battery 15 is located on top of the electrochemical adsorption zone 5 to prevent obstruction of the primary adsorption zone 4 and the bacterial-algae symbiotic zone. Each zone is independent of the others, which facilitates cleaning and subsequent maintenance during use.

[0030] like Figure 2As shown, a primary adsorption zone 4 is equipped with a primary packing frame 401 and primary adsorption components filled within the primary packing frame 401. The primary adsorption components are used to adsorb large molecular pollutants. The primary packing frame 401 is slidably connected to the housing 2. The primary adsorption components include porous adsorption materials, such as activated carbon and resin, and mainly adsorb pollutants such as solid particles, feces, and feed residue. The primary packing frame 401 is slidably connected to the housing 2 and can be pulled out of the primary adsorption zone 4 for replacement. The primary packing frame 401 has a mesh structure, which can isolate larger aquaculture debris in the aquaculture water. In this embodiment, the water can be preliminarily treated in the primary adsorption zone 4, and the first one-way guide plate 6 can be prevented from clogging.

[0031] In the electrochemical reaction zone, the anode and cathode are connected to the storage battery 15. The water flow that separates pollutants in the water into cations and anions enters the cation reaction zone 8 and the anion reaction zone 9 respectively. The first unidirectional guide plate 6 has a porous nanoplate structure, which can increase the hydraulic residence time of the electric field, ensure the rapid separation of cations and anions, and at the same time prevent the loss of bacterial and algal biomass in the bacterial and algal symbiotic zone.

[0032] After the water flows into the algae-bacteria symbiotic zone, in the cation reaction zone 8, the removal of heavy metal ions in the water is achieved through two stages: biosorption and bioaccumulation. First, under low concentration conditions, metal cations such as Cu... 2+ Zn 2+ Metal ions can bind to functional groups on the cell surface, such as carboxyl, thiol, and amino groups, through bioadsorption processes like surface complexation, ion exchange, and redox reactions. Bioaccumulation, on the other hand, involves the binding of adsorbed metal ions on the microbial surface to certain enzymes on the cell membrane, followed by active transport into the cytoplasm. Within the ribosome, these ions participate in the synthesis of polypeptides or proteins, such as Zn. 2+ Mn 2+ Cu 2+ These organisms can participate in cell metabolism and enzymatic processes. In the anion reaction zone 9, algae convert organic nitrogen in the water into inorganic nitrogen through assimilation, and reduce inorganic nitrogen to ammonia nitrogen, which is used to synthesize various amino acids needed by cells; bacteria can convert nitrogen compounds in the water into N2 under anaerobic conditions through a series of denitrification reactions, thereby achieving effective nitrogen removal; in the phosphorus treatment process, microalgae and other organisms preferentially assimilate nitrogen. and Inorganic phosphorus is used for ATP synthesis through substrate-level phosphorylation, oxidative phosphorylation, and photophosphorylation. When inorganic phosphorus is insufficient, microalgae absorb organic phosphorus from the water and convert it into inorganic phosphorus to maintain cellular life activities. In particular, some algae and bacteria have the function of phosphorus over-uptake. When phosphorus is excessive in the aquatic environment or cells move from a phosphorus-deficient environment to a phosphorus-rich environment, microorganisms can over-uptake phosphorus and store it in the cells in the form of polyphosphate particles. The chemical pathway removes nitrogen and phosphorus by changing the pH of the symbiotic environment. Algae consume CO2 in the water during photosynthesis, regulating the pH of the water body. Phosphorus will be removed through calcium carbonate in wastewater. 2+ Mg 2+ The flocs form complexes and are adsorbed and precipitated by algal cells; at the same time, when the pH is greater than 8, nitrogen compounds in the water can volatilize in the form of ammonia, thereby achieving the removal of nitrogen and phosphorus from aquaculture wastewater.

[0033] An air pump is installed in both the cation reaction zone 8 and the anion reaction zone 9, and the battery 15 is connected to the air pump. Oxygen is supplied to the cation reaction zone 8 and the anion reaction zone 9 through the air pump.

[0034] Both the cation reaction zone 8 and the anion reaction zone 9 contain carbon sources and titanium dioxide. Specifically, burning straw at 300°C under N2 environment is used as a precursor to supplement the carbon source, and titanium dioxide is used as a photocatalytic carrier to catalyze the reaction process and improve the reaction efficiency.

[0035] The top of the cation reaction zone 8 and the anion reaction zone 9 are equipped with a cover plate. The cover plate has a light-transmitting structure to ensure that light can pass through the cover plate into the reaction zone and ensure the smooth progress of photosynthesis.

[0036] Example 2

[0037] This embodiment is the second embodiment of a floating tailwater treatment system. This embodiment is similar to the first embodiment, except that, as shown in the following... Figure 1 , Figure 3 As shown, the tank 2 is equipped with a second one-way flow guide plate 11. One side of the second one-way flow guide plate 11 forms a bacterial-algae symbiotic zone with the first one-way flow guide plate 6, and the other side of the second one-way flow guide plate 11 and the tank 2 form a tail adsorption zone 12. The cation reaction zone 8 and the anion reaction zone 9 are respectively connected to the outlet 13 through the tail adsorption zone 12. After the bacterial-algae solution reacts with the substances in the tail water, the tail water can be treated again in the tail adsorption zone 12 to improve the treatment effect.

[0038] The tail adsorption area 12 is equipped with a tail filler frame and a tail adsorption component filled within the tail filler frame. The tail filler frame can be removed from the tail adsorption area 12. Specifically, the tail filler frame is slidably connected to the inner wall of the housing 2. When the tail adsorption component needs to be replaced after a period of use, the tail filler frame and the tail adsorption component can be easily removed together for replacement as a whole, improving cleaning efficiency.

[0039] Specifically, the tail filler frame has a mesh structure, and the tail adsorption component is a porous composite structure including zeolite, activated carbon, and crushed oyster shells. Among them, the oyster shells provide an alkaline environment, the activated carbon provides a porous structure, the zeolite can effectively adsorb excess phosphorus, and when the pH is greater than 8, nitrogen compounds in the water can volatilize in the form of ammonia, thereby achieving the removal of nitrogen and phosphorus from the aquaculture tailwater.

[0040] Example 3

[0041] This embodiment is the third embodiment of the floating tailwater treatment system. Similar to Embodiment Two, the difference lies in that the partition 7 is equipped with a first valve, the storage tank 10 is equipped with a second valve that can connect to the first valve, and the bottom of the storage tank 10 is equipped with a push-button switch for controlling the opening and closing of the second valve. The algae-bacterial symbiosis area is equipped with two protrusions, each corresponding to one of the two push-button switches. In implementation, different algae-bacterial solutions are placed in the two storage tanks 10 according to actual needs. When the storage tanks 10 are inserted into the storage area, the second valve connects to the first valve, and the push-button switch is pressed by the protrusions to open the second valve.

[0042] Sensors for sensing water flow are installed in the cation reaction zone 8 and the anion reaction zone 9, respectively. The battery 15 is connected to the sensors, and the first valve is communicatively connected to the sensors. When the system stops working, the first valve is closed to prevent water in the cation reaction zone 8 and the anion reaction zone 9 from flowing out of the first valve into the storage area. During use, after the storage tank 10 is installed, the second valve is opened, and the tailwater is pumped into the tank 2 for treatment by a water pump. When the sensor in the cation reaction zone 8 or the anion reaction zone 9 senses water flow, it controls the corresponding first valve to open, realizing the connection between the first valve and the second valve, and realizing the supply of bacterial and algal solution.

[0043] In this embodiment, when the storage tank 10 is not installed in place, the second valve remains closed and the first valve remains closed to prevent water in the cation reaction zone 8 and the anion reaction zone 9 from flowing out of the first valve into the storage zone. When the system is shut down, after the storage tank 10 is installed in place, the second valve opens and the first valve closes to prevent the bacterial and algae solution from being lost. When the system is started to treat the tailwater, the sensor detects the water flow and the first valve opens. At this time, the bacterial and algae solution in the storage tank 10 can smoothly pass through the second valve and the first valve into the cation reaction zone 8 and the anion reaction zone 9 for reaction.

[0044] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A floating tailwater treatment system, characterized in that, The device includes a float (1), a box (2) located on top of the float (1), and a solar power generation device. One end of the box (2) is provided with a water inlet (3), and the water inlet (3) is provided with a water pump. The other end of the box (2) is provided with a water outlet (13). The box (2) is provided with a first unidirectional flow guide plate (6). The first unidirectional flow guide plate (6) and one end of the box (2) form an electrochemical adsorption zone (5) and a primary adsorption zone (4). The electrochemical adsorption zone (5) is connected to the water inlet (3) through the primary adsorption zone (4). The electrochemical adsorption zone (5) is provided with an anode and a cathode. The first unidirectional flow guide plate (6) and the other end of the box (2) form a bacterial-algae symbiotic zone. The solar power generation device includes a connected photovoltaic panel (14) and a battery (15). The photovoltaic panel (14) is located on top of the floating plate (1), the storage battery (15) is located on top of the electrochemical adsorption zone (5), and the water pump, anode and cathode are respectively connected to the storage battery (15); the algae symbiotic zone is divided into a cation reaction zone (8), a storage zone and an anion reaction zone (9) by two partitions (7). The storage zone between the two partitions (7) is provided with two storage tanks (10). The two storage tanks (10) are respectively connected to the cation reaction zone (8) and the anion reaction zone (9). The cation reaction zone (8) and the anion reaction zone (9) are respectively connected to the water outlet (13); the two storage tanks (10) supply different algae solutions to the cation reaction zone (8) and the anion reaction zone (9).

2. The floating tailwater treatment system according to claim 1, characterized in that, The primary adsorption zone (4) is provided with a primary packing frame (401) and a primary adsorption component filled in the primary packing frame (401). The primary adsorption component is used to adsorb macromolecular pollutants. The primary packing frame (401) is slidably connected to the box body (2).

3. The floating tailwater treatment system according to claim 1, characterized in that, The box (2) is provided with a second one-way flow guide plate (11). One side of the second one-way flow guide plate (11) and the first one-way flow guide plate (6) form the bacterial-algae symbiotic zone. The other side of the second one-way flow guide plate (11) and the box (2) form a tail adsorption zone (12). The cation reaction zone (8) and the anion reaction zone (9) are respectively connected to the outlet (13) through the tail adsorption zone (12).

4. The floating tailwater treatment system according to claim 3, characterized in that, The tail adsorption area (12) is provided with a tail filler frame and a tail adsorption component filled in the tail filler frame. The tail filler frame can be removed from the tail adsorption area (12).

5. The floating tailwater treatment system according to claim 4, characterized in that, The tail adsorption component is a porous composite structure comprising bird zeolite, activated carbon, and crushed oyster shells.

6. The floating tailwater treatment system according to claim 1, characterized in that, The partition (7) is provided with a first valve, the liquid storage tank (10) is provided with a second valve that is connected to the first valve, the bottom of the liquid storage tank (10) is provided with a button switch for controlling the opening and closing of the second valve, the algae-bacteria symbiotic area is provided with two protrusions, and the two protrusions are respectively provided with two button switches.

7. The floating tailwater treatment system according to claim 6, characterized in that, The cation reaction zone (8) and the anion reaction zone (9) are respectively equipped with sensors for sensing water flow. The battery (15) is connected to the sensors, and the first valve is communicatively connected to the sensors.

8. The floating tailwater treatment system according to claim 1, characterized in that, An air pump is provided in the cation reaction zone (8) and the anion reaction zone (9), and the battery (15) is connected to the air pump.

9. The floating tailwater treatment system according to claim 1, characterized in that, Both the cation reaction zone (8) and the anion reaction zone (9) contain carbon source and titanium dioxide.

10. The floating tailwater treatment system according to any one of claims 1 to 9, characterized in that, The top of the cation reaction zone (8) and the anion reaction zone (9) is provided with a cover plate, which is a light-transmitting structure.

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