JP2006218385A - Hydrogen recovering electrolysis type water quality improving device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use oxygen generated on an anode for quality improvement of water in a low oxygen state by supplying natural energy, such as sunlight and wind force, with a low environmental load to a water electrolysis device; to recover hydrogen generated on a cathode without waste. <P>SOLUTION: A hydrogen recovering electrolysis type water quality improving device comprises: a barge arranged on the water; an electrolytic cell arranged under the water and having an anode and a cathode; a power source arranged on the barge and supplying electric power to the electrolytic cell; a hydrogen storage tank arranged on the barge; and a hydrogen collecting pipe connected to the bottom of the hydrogen storage tank and arranged above the cathode of the electrolytic cell. Water is electrolyzed between the anode and cathode of the electrolytic cell. This low-oxygen water quality improving device supplies direct-current power to the electrolytic cell disposed at the deep part or on the bottom part from above the water surface to electrolyze water, thereby generating oxygen on the anode, and generating hydrogen gas on the cathode. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for improving water quality in lakes, rivers, oceans, and the like, and more specifically, by improving the water environment by increasing dissolved oxygen by supplying oxygen and using natural energy as a power source. The present invention also relates to a water quality improvement method and apparatus for simultaneously collecting hydrogen energy.

  In recent years, inflowing pollutants in freshwater areas such as rivers and lakes have led to a decrease in dissolved oxygen concentration in the water, resulting in hypoxic conditions that do not give up organisms. Contaminants flowing in from homes, business establishments, farmland, urban areas, forests, and rain that falls directly on lakes are increasing the environmental burden. Moreover, even in closed seawater areas such as harbors, the vicinity of the seabed tends to be in a low oxygen state due to the influence of sludge and sediment.

  As a conventional attempt to improve water quality in which dissolved oxygen is lowered, aeration forcing air is generally used, and a water flow circulation method in which water in the deep layer portion and the surface layer portion is forcibly replaced by a pump is also performed. Yes. However, the state of the deep layer where the dissolved oxygen decreases or the bottom of the water is covered with sludge with a specific gravity close to that of water, and the conventional method of circulating air and water raises the secondary sludge by rolling up the deposited sludge. Something that caused it was born.

  In addition, there are many cases where there is no power source such as lakes and harbors where improvements should be made, and it is necessary to operate and manage remote cables by installing overhead cables or burying them or installing power supply equipment such as private power generators. there were.

  As described above, the conventional water quality improvement methods have a poor improvement effect despite the large power consumption and maintenance cost.

  On the other hand, unlike the purpose of improving water quality, water electrolysis equipment uses natural energy obtained from sunlight, wind power, hydropower, wave power, tidal power, temperature differences, etc., from the viewpoint of global environment conservation, load reduction, and prevention of global warming. There have been proposed attempts to convert it into hydrogen energy and supply it to a fuel cell to convert it into electric power or to directly drive an electric vehicle.

For example, Patent Document 1 describes a device for water electrolysis using a solar cell and a converter, Patent Document 2 describes a method for obtaining electric power using a polymer electrolyte type water electrolysis device using wind power, and Patent Document 3 describes various natural energies. Discloses a system for supplying hydrogen obtained from electrolysis to hydrogen vehicles.
JP-A-7-233493 Japanese Patent Laid-Open No. 11-228101 Japanese Patent Laid-Open No. 10-299576 JP-A-9-291385

  The purpose of the present invention is to supply natural energy, such as sunlight and wind power, with low environmental impact to the water electrolysis device, to make oxygen generated at the anode useful for improving the water quality in a low oxygen state, and to generate hydrogen generated at the cathode. Recovering energy as a wasteless source, and achieving the above two objectives both lead to a reduction in environmental impact.

Another object of the present invention is to provide a method and an apparatus for water electrolysis by installing an apparatus at a location where hypoxia occurs. When electrolyzing in a deep layer under low temperature and high water pressure, which is convenient for oxygen dissolution, the anode surface area can be made larger than the cathode to reduce the current density, and oxygen gas can be quickly converted to dissolved oxygen without generating bubbles. On the other hand, hydrogen generated at the cathode is collected and transported to the surface of water under atmospheric pressure while maintaining a high pressure state.

  The hydrogen recovery type electrolytic water quality improvement device of the present invention includes a barge disposed on the water, an electrolyzer having an anode and a cathode disposed on the water, and power supplied to the electrolyzer disposed on the barge. A hydrogen storage tank disposed on the barge, and a hydrogen collecting tube connected to the bottom of the hydrogen storage tank and disposed above the cathode of the electrolytic cell, Water is electrolyzed between the anode and cathode of the electrolytic cell. The apparatus for improving low oxygen water quality of the present invention supplies DC power from the water surface to an electrolytic cell disposed in a deep layer portion or a bottom layer portion for water electrolysis, and generates oxygen at the anode and hydrogen gas at the cathode.

  As a means of recovering hydrogen generated at the cathode in a high pressure state, a hydrogen storage pipe such as a pipe or a plastic tube is connected between the hydrogen storage gas-liquid separation tank on the water surface and the electrolyzer in water. There is a method of collecting on the water surface. Hydrogen bubbles are collected at the upper part of the cathode such as a rod, cylinder, or plate, and introduced and moved to the tank through a hydrogen collection tube connected to the water surface. If the tank is installed in the same deep layer as the electrolytic cell, it is advantageous in terms of pressure resistance and safety of the tank, but valve control and maintenance management under high water pressure are considerably complicated.

  The hydrogen recovery type electrolytic water quality improvement apparatus of the present invention is characterized in that the surface area of the anode is made larger than that of the cathode of the electrolytic cell. That is, the water electrolysis apparatus of the present invention is characterized in that oxygen gas is not generated as much as possible by making the anode surface area larger than the cathode surface area. At the cathode with a relatively high current density, the hydrogen gas is bubbled and floats to the top. On the other hand, in the anode having a large surface area, the generated oxygen is diffused into the water as dissolved oxygen, but oxygen molecules accumulated on the electrode surface or in the vicinity of the electrode adhere to the wide electrode surface as small bubbles.

  In the hydrogen recovery type electrolytic water quality improvement apparatus of the present invention, the electrolytic cell may include a hydrogen collecting umbrella so as to cover an upper side of the cathode.

  In the hydrogen recovery type electrolytic water quality improvement apparatus of the present invention, the anode of the electrolytic cell may be integrally formed with the hydrogen collecting umbrella so as to surround the cathode in a net shape with a metal wire or the like, or You may attach to a hydrogen collection umbrella.

  In the hydrogen recovery type electrolytic water quality improvement apparatus of the present invention, the cathode of the electrolytic cell may be connected to the lower end of the hydrogen introduction pipe.

  In the hydrogen recovery type electrolytic water quality improvement apparatus of the present invention, the electrolytic cell is preferably disposed in deep water of 10 m or more from the water surface. Since the environment in the deep layer is in a high water pressure and low water temperature state, the amount of dissolution is increased according to the Henry's law rather than electrolysis at room temperature and normal pressure. Further, since the anodic oxidation is performed in a state where the water in the vicinity of the anode is in a low-speed flow state, it can be dissolved in a supersaturated state as compared with normal oxygen gas aeration. Furthermore, it is convenient for the diffusion of dissolved oxygen by utilizing the natural oscillating flow that exists near the bottom of large lakes such as Lake Biwa.

  The hydrogen recovery type electrolytic water quality improvement method of the present invention is a method of supplying electricity from above the water surface to an electrolytic cell installed in deep water to electrolyze water to dissolve oxygen generated in the anode at the same time as the cathode. The produced hydrogen gas is recovered on water.

In the hydrogen recovery type electrolytic water quality improvement method of the present invention, the electrolysis of the water may be performed by an ion exchange resin membrane method.

  By using the water quality improvement method and apparatus of the present invention, it is possible to improve the low oxygen state that occurs in deep layers such as lakes and harbors and is necessary for improvement without rolling up sediment sludge in the bottom layer. Oxygen can be dissolved efficiently. Improving the hypoxic state in the deep layer maintains the diversity of benthic organisms and their food chain, prevents water eutrophication, and suppresses the occurrence of red tides and sea cucumbers, thereby conserving water quality as drinking water Useful. Diversity of benthic organisms is also necessary for the habitat and growth of seafood and has the effect of securing and increasing fishery resources.

  As electric power supplied to the electrolytic cell of the present invention, in addition to sunlight, it can be used in combination with natural energy power generation such as wind, hydropower, wave power, tidal power, temperature difference, etc., or even in a natural environment where commercial power cannot be obtained Can be combined with other distributed generation systems. According to the present invention, industrially useful high-purity hydrogen can be obtained at the same time as improving water quality by utilizing natural energy with low environmental impact. Since hydrogen obtained by water electrolysis does not contain carbon monoxide, it is optimal for use in fuel cells.

The electrolytic cell according to the present invention is installed in the deep layer to supply electric power from natural energy, and the water in the low-dissolved oxygen is directly electrolyzed to improve the water quality in the deep layer, while regenerating energy without waste. The utility value of the hydrogen recovery type water electrolysis type water quality improvement method and apparatus that can be used is extremely high.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG.

  FIG. 1 is a schematic cross-sectional view showing an example of a hydrogen recovery type electrolytic water quality improvement device that enables hydrogen recovery according to the present invention. The structure having main functions includes an electrolytic cell 1, a hydrogen collection pipe 2, a hydrogen storage tank 3, a solar panel 4, and a barge (flat bottom ship) 5.

  In the present embodiment, the electrolytic cell 1 includes an anode 6 and a cathode 7 and a hydrogen collecting umbrella 8, and the upper part of the hydrogen collecting umbrella 8 is formed by a hydrogen collecting tube 2 having a gas-liquid inlet 9 at the lower part. It is connected to a hydrogen storage tank 3 on the surface of the water. The hydrogen storage tank 3 is a pressure-resistant container that has both functions of maintaining the pressure of the hydrogen gas 10 and gas-liquid separation. The water storage tank 3 has a water outlet 12 having a water reflux valve 11 at a lower portion and a hydrogen discharge valve 13 at an upper portion. A hydrogen outlet 14 is attached.

  The fixing method of the water electrolysis type water quality improvement apparatus shown in FIG. 1 is that the cathode 7, the hydrogen collecting pipe 2, and the hydrogen storage tank 3 are integrated in the vertical direction and fixed to the barge 5 on the water surface. The mooring line 15 and the anchor 16 are fixed at an arbitrary place. Separately, the fixing member 17 coupled to the cathode 7 so as to protrude downward from the electrolytic cell 1 is fixed deeply in the bottom layer ground 18. FIG. 1 shows a combination of both, but either one may be adopted according to the depth or environment, or a structure such as a bridge, an observation base, a dike, a quay may be used instead of the barge 5.

  The anode 6, cathode 7, hydrogen collector umbrella 8, etc. used in the electrolytic cell 1 of the present invention can be easily arranged and configured as long as they are cylindrical, cylindrical or conical. However, it is also possible to arrange the plate electrodes horizontally as long as hydrogen can be collected, and the present invention does not specifically limit the electrode shape or the method of arranging the electrolytic cell.

  Next, each member will be described. As materials for the anode 6, inexpensive electrode materials such as carbon fiber plate, ferrite, and stainless steel can be cited as candidates, but it cannot be said that the life, conductivity, and electrode corrosion resistance are sufficient. In particular, stainless steel or the like that may cause heavy metals to elute into the environment cannot be used for the anode. Usually, a titanium material plated with a noble metal such as platinum or tantalum is used. When an anodic potential is applied to titanium, a titanium oxide film is formed and passivated, so an insoluble electrode imparted with conductivity by platinum plating or the like is suitable. If the titanium electrode is made net-like or expanded, oxygen diffusion is promoted without hindering the lake water flow at the bottom of the lake. In addition, platinum has a high chlorine overvoltage and is not oxidized even if chlorine ions are present in the water, so only safe oxygen is produced without fear of generating free chlorine that is toxic to the ecosystem.

  The material of the cathode 7 is usually inexpensive steel or stainless steel, but nickel (Raney nickel) whose surface is treated with tin can be used for the purpose of reducing hydrogen overvoltage and reducing power consumption. Similar to the anode, an insoluble titanium electrode plated with noble metal may be used. Normally, when fresh water is electrolyzed for a long period of time, alkaline earth metal (Ca, Mg, etc.) hydroxide adheres to the cathode surface, preventing current flow. However, as a preventive measure, the cathode is reverted for a short time to recover the cathode. In the case of adopting known means, an insoluble electrode is used for both electrodes.

  In this embodiment, the hydrogen collection umbrella 8 is fixed to the hydrogen collection tube 2 and also serves as a support and fixing of the anode 6 provided at the lower part of the umbrella. A non-conductive plastic can be used for the hydrogen collecting umbrella 8, but if a high-strength metal material is used, insulation between the anode 6 and the anode 7 is required. Moreover, it is convenient to use a metal such as titanium, stainless steel, or steel as the material of the hydrogen collecting tube 2 because it also serves as a power supply conductor to the cathode. If inexpensive plastic pipes or tubes are used in deep layer electrolysis that requires long members, a cathode conductor (not shown) is required separately.

  Next, a method for collecting hydrogen gas will be described. The cathode 7 is mechanically and electrically connected to the lower part of the conductive hydrogen collecting tube 2, and the hydrogen bubbles 19 generated at the cathode are the hydrogen collecting umbrella 8. Collected at the top of the water and floats through the gas-liquid inlet 9 with water. While forming a mixed state of the water phase 20 and the hydrogen gas phase 21, both phases rise to the hydrogen storage tank 3 with gas buoyancy as the driving force. When the water outlet 12 and the hydrogen outlet 14 of the tank are closed, the internal pressure of the tank can be increased to a pressure close to the deep water pressure at the location where the electrolytic cell 1 is installed.

  However, when the tank internal pressure and the deep layer are the same pressure, the driving force of the pressure difference disappears, so that the gas-liquid mixed phases 20 and 21 cannot rise up the hydrogen collecting pipe 2 quickly. Actually, the gas-liquid mixed phases 20 and 21 can be stabilized by electrolysis with the pressure in the tank 3 slightly lower than the deep layer pressure while keeping the liquid level of the hydrogen storage tank 3 constant while opening and closing the valves 11 and 13. I can move. Thus, if water electrolysis is performed under high water pressure, high-pressure hydrogen can be stably obtained, and there is an advantage that hydrogen can be transported far away without a booster pump.

  The conditions for forming the above gas-liquid mixed state are experiments according to the scale of the apparatus, taking into account many factors such as the amount of gas generated (current amount), the inner diameter of the hydrogen collection tube 2, the height difference, and the gas-liquid separation speed. To be determined. The principle and utilization method of such a gas-liquid lift-up phenomenon is also described in Patent Document 4 and the like.

  As a device for supplying electric power, a photovoltaic power generation system is installed on the upper surface and inside of the barge 5. This system includes a power control system 22 that performs input / output matching with the solar panel 4. A DC-DC converter, a storage battery, and the like for efficiently generating power and electrolyzing water and enabling operation at night are incorporated in the control system. The electric power obtained by the solar cell is applied with a DC voltage through the power control system between the anode conductor 23 connected to the anode 6 and the cathode conductor 24 connected to the cathode 7 through the metal hydrogen collecting tube 2. Although the solar panel 4 is illustrated as a power source, various natural energies can be used.

  An example of the operation principle of water electrolysis is shown in FIG. OH- ions are produced at the cathode and oxygen is produced at the anode. FIG. 3 shows a model of current density and potential during operation. The difference between positive and negative cathode potentials at zero current density, that is, the standard theoretical decomposition voltage of water is 1.23 V at room temperature, but overvoltage is added to each when current is actually passed. The currents flowing in both poles are naturally the same, but the current density changes when the electrode surface area is changed. 3 according to the present invention is characterized in that the cathode current density is increased (to the right of the lower straight line) and the anode current density is decreased (to the left of the upper straight line).

  Next, another embodiment of the present invention will be described with reference to FIG.

  Even in the second embodiment, the main point of the present invention, that is, the electrolytic cell is installed in a high water pressure environment, but the point different from the above embodiment is the operation principle of water electrolysis and the electrolytic cell 1. In the structure. Since the structures other than the electrolytic cell 1 are the same as those in FIG.

  The electrolytic cell 1 shown in FIG. 2 has a laminated structure in which flat plate-like members are tightly pressed. That is, the anode 6 and the cathode 7 are formed on both sides of the ion exchange resin film 25 via the anode power supply 6a and the cathode power supply 7a, and the ion exchange resin film 25 is pressed into contact therewith.

  The functions that the materials used for the anode power supply 6a and the cathode power supply 7a should have are conductivity, porosity, elasticity, electrode corrosion resistance, economic efficiency, etc., and generally a platinum-plated titanium net or expanded metal It is possible to practically use a power feeding body in which a plurality of sheets are laminated to give elasticity. In addition, a material obtained by sintering fibrous or particulate titanium, fibrous carbon, or a composite material thereof can also be used. By utilizing such a functional material, it becomes possible to simultaneously supply water and release gas while maintaining the electrical connection by elastically pressing each part.

  The anode 6 and the cathode 7 are electrode corrosion-resistant metal plates, and pores are opened on the entire surface or a part thereof. For these two electrode materials, an insoluble electrode made of platinum-plated titanium can be used, but for the cathode 7, there is no problem even if stainless steel or low carbon steel is used.

Since the electrolytic cell 1 in FIG. 2 uses the ion exchange resin membrane 25, pure water is generally supplied as raw material water. When Ca ²⁺ and Mg ²⁺ (impurities dissolved in water) are adsorbed and accumulated on the functional groups of the ion exchange resin, the electrical resistance increases and electrolysis cannot be performed. As a means for refining fresh water such as lake water by ion exchange and using it as raw material water, an anode chamber wall 26 having pores is provided on the back (right side) of the anode 6 in FIG. A method of filling the resin particles 27 was shown.

  Of course, it is also possible to supply pure water directly to the anode chamber from a pure water production apparatus (not shown) installed separately from the electrolytic cell 1, so that it is not necessary to incorporate the ion exchange resin particles 27. . It is important to install the electrolytic cell 1 under the deep layer, and various methods can be applied to the pure water supply means.

  In FIG. 2, since the direction of the anode 6 is opposed to the natural water flow, the natural water permeates the pores of the anode chamber wall 26 and the layer of the ion exchange resin particles 27 and becomes pure water by deionization. This raw material water also passes through the pores of the anode 6 and the anode power supply 6a and reaches the surface of the ion exchange resin film 25, which is an electrode reaction site. Here, water is electrolyzed to generate oxygen gas and hydrogen ions. In the vicinity of the anode power supply 6a, oxygen gas in a fine generation period is mixed with water in a state where the gas-liquid contact surface area is increased, and efficiently dissolves in water and changes to supersaturated dissolved oxygen.

  Excess oxygen that could not be dissolved in the vicinity of the anode passes through the anode feeder 6a and the anode 6, the ion exchange resin particles 27, and the anode chamber wall 26 in the form of bubbles in a direction opposite to the direction in which water is supplied. . At this time, dissolved oxygen dissolved by gas-liquid contact with further water is released out of the system of the electrolytic cell 1 as indicated by an arrow. Water containing a high concentration of dissolved oxygen is diffused downstream with the natural water stream.

  In one cathode reaction, the hydrogen ions generated on the anode side of the ion exchange resin film 25 move to the cathode side and become hydrogen gas at the contact site with the cathode power supply, and pass through the cathode power supply 7a and the cathode 7. As a result, bubbles 19 are lifted from the back surface of the electrode.

  Speaking of electrode side reactions that occur in ion-exchange membrane water electrolysis, hydrogen ions moving in the membrane move to the counter electrode with an amount of bound hydrated water proportional to the electrolysis current, and simultaneously become hydrogen gas on the cathode side. Hydration water is leached. Therefore, not only the bubbles 19 but also hydrated water are discharged from the back surface of the cathode 7 to the cathode chamber 28. If the cathode chamber 28 installed under the deep layer has an arbitrary pressure resistance and the valves 11 and 13 are closed and the hydrogen storage tank 3 is operated in a sealed state, the internal pressure of the tank is easily increased by the amount added to the deep water pressure. it can.

  As described above, in this embodiment, unlike the above embodiment, the ion exchange resin membrane method is used as the water electrolysis method. The electrode reaction is shown in FIG. In the above embodiment, water on the cathode front surface (between the electrodes) is electrolyzed (in the case of FIG. 3), but in this embodiment, water supplied from the anode back surface is electrolyzed (in the case of FIG. 4). In the above embodiment, the generated OH− ions move in water to the anode, whereas in the present embodiment, the generated H + ions move in the film toward the cathode. Thus, it is necessary to devise how to supply the raw water because the ionic species involved in the electrolytic reaction are different, but in any embodiment, water is electrolyzed, and the standard theoretical decomposition voltage is normal temperature. Same 1.23V.

  As described with reference to FIG. 1 of the previous embodiment, in order to apply the method of changing the current density of the cathode to promote the dissolution of oxygen in FIG. 2, the entire surface of only one side of the ion exchange resin film 25 is made porous. A material called a bonded electrode plated with a conductive metal can be used. The entire surface on the anode side of the ion exchange resin film 25 is involved in the reaction, whereas the surface on the cathode side is innocuous, so only the surface area (determined by the porosity) in contact with the cathode power supply becomes the reaction surface, and the current density balance between the two electrodes is balanced. It can be changed. In addition, as described in FIG. 1, it can be easily imagined that the electrodes can be arranged not only vertically but also horizontally as shown in FIG. However, it is important to quickly diffuse the dissolved oxygen generated in the deep layer by providing a water channel or the like around the electrolytic cell so that the water flow can easily enter and exit.

  The major difference between the above two embodiments is due to the material and structure between the cathode and cathode. In FIG. 1 representing the first embodiment, oxygen and hydrogen gases are generated between the two electrodes, so that the electrical resistance increases and a power loss occurs. However, since the number of parts is small, the object can be achieved with an inexpensive device.

  In FIG. 2, which represents the second alternative embodiment, there is no free water between the electrodes and water is consumed from the back of the anode to produce oxygen, as well as hydrogen is released from the back of the cathode. The apparatus of the type shown in FIG. 2 requires an expensive ion exchange resin membrane and other members, but since the current density can be increased, the electrolytic cell is compact and power loss is small.

  As mentioned above, although the hydrogen recovery type | formula electrolytic water quality improvement method and apparatus of this invention were demonstrated, this invention is not limited to the said embodiment and the Example demonstrated below. Regardless of which electrolytic cell is employed, the electrolysis conditions are not limited in detail by these examples, and a plurality of electrolytic cells can be used at various electrolytic currents depending on the environment and scale to be improved in water quality. . The greatest feature of the present invention is that the electrolytic cell is placed under the deep layer and electrolyzed with water to improve the water quality while dissolving oxygen and at the same time skillfully recover the generated hydrogen and use it as effective energy. .

  In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

Examples using the hydrogen recovery type electrolytic water quality improvement method and apparatus of the present invention described in the above embodiment will be described below.

As an example of the present invention, it is assumed that the hypoxic state of the lake water (volume: about 100 million m ³ ) deeper than the depth of 90m of Lake Biwa is assumed. If solar panels of 100m x 100m are used, the energy balance, scale, and water quality improvement effect can be estimated as follows.

Expressing the annual average solar radiation in terms of energy, the average value over the past 10 years in the North Lake District of Lake Biwa was 3.5kWh / m ² / day. The power generation efficiency of solar panels is originally about 20%, but it is set to 12% considering dirt. The annual usable amount is 1.533 × 10 ⁶ kWh / year, and the actual usable amount is 1.4 × 106 kWh / year in consideration of the voltage drop (about 91%) due to power transmission. In general, the theoretical amount of oxygen generated by water electrolysis is 0.2089 × 10 ⁻³ m ³ / Ah. If oxygen is generated at an electrolysis voltage of 1.4 V, oxygen of 0.15 m ³ / kWh is generated. Using this solar panel power, 0.21 × 10 ⁶ m ³ of oxygen can be supplied annually. 100 million Supplying oxygen to water mass of m ³ 2.1ml / L (approximately 3.0 mg / L) oxygen increases the. When the actual measured value of 1.0mg / L of the minimum oxygen concentration in Lake Biwa is added, the dissolved oxygen concentration will recover to about 4.0mg / L.

The amount of hydrogen recovered from the electrolyzer is 0.42 × 10 ⁶ m ³ per year, which is equivalent to the energy recovery that runs about 470 fuel cell vehicles for one year.

The above is a concept on a practical scale that is assumed to be applied to Lake Biwa, but the solar radiation energy, solar cell data, and electrolytic cell energy calculation are based on numerical values confirmed in basic experiments. The estimated calculation error is considered to be small.

The lake environment can be improved by the method and apparatus of the present invention. It is essential to improve the water quality of the lake for fisheries and related industries such as fishing and aquaculture of various fish and shellfish without obstructing the breeding of birds and mammals that use the flora and fauna of the lake as their food chain.
Moreover, if the water quality of the lake bottom is improved, not only can the ecosystem of deep water layers be protected, but also the increase of nitrogen and phosphorus components in the water can be suppressed. The growth of algae caused by these increases can be suppressed, so that the lake water can be kept clean and can be used effectively for drinking water, agricultural and industrial water, and also useful as a tourism resource.
In recent years, in deep lakes such as Lake Biwa, there is a tendency for the dissolved oxygen at the bottom of deep lakes to be deficient not only in Japan but also on a global scale. It is pointed out that not only the eutrophication of the water quality but also the severe cold and snowfall in winter decreased due to the progress of global warming, and the convective mixing effect between the lake surface with high dissolved oxygen and the deficient lake bottom was lost. ing. That is, the present invention can be sufficiently used even in overseas lakes that are affected by global warming on a global scale.
Since hydrogen can be recovered from natural energy, the present invention is related to energy and the automobile industry, and can be directly used for environmental conservation equipment and environment-related industries. And we believe that protecting nature can have a huge impact on a very wide range of industries and regions.

It is a schematic sectional drawing which shows one Example of the hydrogen recovery type water electrolysis type water quality improvement apparatus of this invention. It is a schematic sectional drawing which shows the other Example of the hydrogen recovery type water electrolysis-type water quality improvement apparatus of this invention. In order to make the present invention possible, it is a principle diagram for explaining a method of increasing the surface area of an anode larger than that of a cathode and increasing the efficiency of hydrogen generation and oxygen dissolution. It is a principle figure explaining the electrolytic reaction at the time of using the ion exchange resin membrane used for this invention.

Explanation of symbols

1: Electrolytic cell 2: Hydrogen collection tube 3: Hydrogen storage tank 4: Solar panel 5: Barge 6: Anode 6a: Anode feeder 7: Cathode 7a: Cathode feeder 8: Hydrogen collector 9: Gas-liquid introduction Port 10: Hydrogen gas 11: Water reflux valve 12: Water outlet 13: Hydrogen outlet valve 14: Hydrogen outlet 15: Mooring line 16: Anchor 17: Fixed member 18: Lake bottom 19: Hydrogen bubble 20: Water phase 21: Hydrogen gas phase 22: Power control system 23: Anode lead 24: Cathode lead 25: Ion exchange resin film 26: Anode chamber wall 27: Ion exchange resin particle 28: Cathode chamber 51, 52: Hydrogen recovery type electrolytic water quality improvement device

Claims (8)

A barge on the water,
An electrolytic cell having an anode and a cathode disposed in water;
A power source for supplying power to the electrolytic cell;
A hydrogen storage tank disposed on the barge;
A hydrogen collecting tube connected to the bottom of the hydrogen storage tank and disposed above the cathode of the electrolytic cell;
With
Electrolyzing water between the anode and cathode of the electrolytic cell;
Hydrogen recovery type electrolytic water quality improvement device. The hydrogen recovery type electrolytic water quality improvement apparatus according to claim 1, wherein the surface area of the anode is made larger than that of the cathode of the electrolytic cell. 3. The hydrogen recovery type electrolytic water quality improvement apparatus according to claim 1, wherein the electrolytic cell is provided with a hydrogen collecting umbrella so as to cover an upper side of the cathode. The hydrogen recovery type electrolytic water quality improvement apparatus according to claim 3, wherein the anode of the electrolytic cell is formed in a net shape, and is attached to the hydrogen collecting umbrella so as to cover the periphery of the cathode. The hydrogen recovery type electrolytic water quality improvement apparatus according to claim 1, wherein a cathode of the electrolytic cell is connected to a lower end portion of the hydrogen introduction pipe. The hydrogen recovery type electrolytic water quality improvement device according to claim 1, wherein the electrolytic cell is disposed in deep water of 10 m or more from a water surface. It is characterized by supplying electricity from above the water surface to the electrolytic cell installed in the deep water to electrolyze the water to dissolve the oxygen generated at the anode in the water and at the same time recover the hydrogen gas generated at the cathode on the water Hydrogen recovery type electrolytic water quality improvement method. The hydrogen recovery type electrolytic water quality improvement method according to claim 7, wherein the water is electrolyzed by an ion exchange resin membrane method.

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