SATURATED WATER GENERATION DEVICE

Abstract

[Subject] The invention relates to a saturated water generation device capable of efficiently generating oxygen-saturated water in a lake, marsh, seafood aquaculture farm, wastewater treatment plant, or similar, with a simple structure to sufficiently increase the dissolved oxygen concentration of the water. [Solution] A saturated water generation device 1a comprises: a container 2 in which an upper surface 2f is open and a bottom surface 2c and side surfaces 2e are closed by a bottom plate 2a and four side plates 2b, each having a rectangular shape in plan view; a water guide plate 3 that is bent to take a shape in which an ovoid line in a side view is partially cut out, and that is installed inside the container 2 with an opening (a portion sandwiched between a pair of ends 3a) pointing upwards;a nozzle 4 that ejects water from the top onto an internal surface 3b near the opening; a water supply pipe 5 having a distal end 5a to which the nozzle 4 is connected; a water supply pump (not shown) whose discharge port is connected to a proximal end of the water supply pipe 5; and an overflow pipe 6 connected to a first drainage port (not shown) provided in the side plate 2b near the bottom plate 2a. [Selected drawing] Figure 1;

Description

Title of the invention: SATURATED WATER GENERATION DEVICE technical field

[0001] The present invention relates to a device installed in a lake, marsh, seafood aquaculture farm, wastewater treatment plant or other for generating water (saturated water) in which the amount of dissolved oxygen reaches a saturated state, and relates in particular to a saturated water generation device capable of efficiently generating saturated water using a simple structure.

[0002] [Prior art.]

[0003] Organic sludge present in a benthic region of a pond, marsh, or other body of water is decomposed by microorganisms. However, if the amount of dissolved oxygen in the water is low, the organic sludge is decomposed anaerobically, resulting in the generation of sulfides, methane gas, and similar substances. To prevent the generation of these harmful substances, a technique for increasing the amount of dissolved oxygen in the water is necessary, and some inventions and schemes relating to this technique have already been disclosed. For example, patent literature 1 discloses an invention relating to a device installed in water for the purpose of improving water quality by supplying oxygen to an oxygen-deficient area, under the name "water oxygen supply device." The invention disclosed in the literature patent 1 comprises a structure including a dissolution tank installed in the water and discharging the dissolved hydrogen peroxide to any depth of the water layer, a pump drawing water from any depth of the water layer and supplying the water to the dissolution tank, a gas injection device for injecting oxygen-containing gas into the pumped water from one suction side and one discharge side of the pump, and a floating body disposed on the surface of the water of a lake or similar, in a state where the pump is installed. According to such a structure, since the pump is installed near an upper portion of the dissolution tank installed in the water, the pressure of the dissolution tank can be increased by using the water pressure, and the undissolved gas is pumped back towards the gas injection means, so that efficient use of the gas can be promoted.

[0004] Furthermore, patent literature 2 discloses an invention relating to a device capable of reliably performing an emergency escape through an exhaust pipe emergency without being affected by a differential pressure between the inside and outside of a main aerator body or floating material, under the name of "depth aeration device". The invention disclosed in the literature patent 2 comprises the main body of the aerator which is maintained in a benthic region of a reservoir or similar lake and circulates deep water near the benthic region by aeration, an exhaust pipe and an emergency exhaust pipe installed in an upper portion of the main body of the aerator, a float valve installed at a lower end opening of the emergency exhaust pipe to rise and fall in accordance with a variation of a water level in the body of the aerator, and has a structure in which the emergency exhaust pipe has an upper end opening provided near the outside of the main body of the aerator and the lower end opening provided below a lower end opening of the exhaust pipe and below the normal water level of an air reservoir in the main body of the aerator,and the float valve closes the lower end opening of the emergency exhaust pipe by buoyancy under normal conditions when the water level is above a certain height of the lower end opening of the emergency exhaust pipe, and opens the lower end opening of the emergency exhaust pipe in an emergency when the water level is below the height of the lower end opening of the emergency exhaust pipe. The invention disclosed in patent 2 does not have a structure in which a valve is opened and closed according to the differential pressure between the inside and outside, but rather a structure in which the float valve in the main body of the aerator is opened and closed according to the rise and fall of the water level, and therefore it is not necessary to adjust the opening and closing pressure. Consequently, emergency venting can be reliably achieved. Furthermore, since the float valve is located in the main body of the aerator, it is not possible for an operating portion to be obstructed by floating material such as muddy sand or for floating material such as a fallen leaf or a plastic bag to block a valve opening, so emergency venting can be reliably achieved.

[0005] In addition, patent literature 3 discloses an invention relating to a device which is installed in a water tank of a wastewater treatment plant or similar and which aerates the water in the water tank while agitating the water under the name of "submersible agitation aeration device". The invention disclosed in the literature, patent 3, comprises a rotating cone that has a downward-folding, bowl-like shape with its opening pointing downwards, a compressed air chamber formed inside the rotating cone, and a plate a disc-shaped bottom straightener having a flat plate-shaped upper surface and disposed below the rotating cone, and has a structure in which a vertical gap between a lower end of a portion of the peripheral edge of the opening of the rotating cone and an upper surface of the bottom straightener plate, and a large number of narrow slots formed around the periphery of the portion of the peripheral edge of the opening of the rotating cone are used as outlets for the compressed air stored in the compressed air chamber. According to such a structure, a large quantity of fine air bubbles sheared by a rotational force of the rotating cone is generated, a contact area with the water increases and the efficiency of oxygen dissolution is improved.

[0006] [List of citations]

[0007] [Patent literature]

[0008] Patent Literature 1: JP 2005-230713 A Literature exam 2: JP 2012-61423 A Literature patent 3: Japanese Patent No. 6600779 Summary of the invention

[0009] [Problems to be solved by the invention]

[0010] The invention disclosed in the literature, patent 1, presents a structure in which water into which oxygen has been injected by means of gas injection is supplied to the dissolution tank, but such a structure does not allow for a sufficient increase in the concentration of dissolved oxygen in the water. Furthermore, Figure 1 and the patent application describe water ejected from a nozzle into the dissolution tank and colliding with a deflector, which vigorously bubbles to increase the gas-liquid contact area as a first embodiment. However, it is difficult to increase the dissolved oxygen concentration equally by boiling the oxygen-injected water. Furthermore, the invention disclosed in the patent literature 2 has the effect of reliably achieving emergency exhaust, but the dissolved oxygen concentration of the water cannot be effectively increased solely by aeration using an air diffuser tube. Furthermore, the invention disclosed in the literature patent 3 presents a structure in which a large quantity of tiny air bubbles are generated and diffused, but it is difficult to sufficiently increase the concentration of dissolved oxygen in the water by a fine bubble generation process.

[0011] The present invention was developed taking into account these classic circumstances and aims to provide a device for generating saturated water capable of generating efficiently oxygen-saturated water in a lake, marsh, seafood aquaculture farm, wastewater treatment plant or similar, with a simple structure to sufficiently increase the concentration of dissolved oxygen in the water.

[0012] [Means of solving the problem]

[0013] In order to achieve the above objective, a saturated water generation device according to a first invention comprises: a container in which a bottom surface and a side surface are closed, a first drainage orifice through which treated water is discharged is provided in a lower portion, and a gaseous phase is formed in an upper portion by a gas containing at least oxygen; a water guiding element which is installed in the container with an opening pointing upwards and which has an internal surface whose contour line has a shape in which an ovoid line is partially cut out in a side view of the internal surface in continuity with the opening; a nozzle configured to eject water from the top towards the internal surface near the opening; a water supply pipe having a distal end to which the nozzle is connected;and a water supply pump having a discharge port connected to a proximal end of the water supply pipe, in which the treated water is stored in the lower portion of the container. Note that an ovoid line is also called a closed convex curve, and is defined as a unique closed curve on a plane such that all points on segments connecting any two points inside the ovoid line are inside the ovoid line. The ovoid line of the first invention comprises a substantially ovoid line in which a portion of the curve is replaced by a straight line. In the first invention, when water is ejected from the nozzle towards the inner surface near the opening relative to the water guide element, the water flows downwards along the inner surface of the water guide element, carrying the gas forming the gaseous phase into the upper part of the container. It then reverses direction in the lowest portion of the inner surface and flows upwards again along the inner surface of the water guide element. Subsequently, the water and air bubbles that have reached the vicinity of the opening of the water guide element are partially pushed into the lower side of the water guide element by the water ejected from the nozzle, and the remainder overflows from the opening of the water guide element.Next, the water and air bubbles pushed into the lower side of the water guide element flow downwards along the internal surface of the water guide element while again carrying the gas described above with them, then reverse to flow upwards in the lowest portion, and divide into . water and air bubbles to be pushed again into the lower side of the water guide member by the water ejected from the nozzle, and water and air bubbles to overflow from the water guide member near the opening.

[0014] As described above, in the first invention, when water ejected from the nozzle repeatedly flows up and down along the inner surface of the water guide element, carrying oxygen-containing gas with it, the inside of the water guide element fills with air bubbles. As a result, more and more oxygen from the air is dissolved in the water, generating saturated water in which the amount of dissolved oxygen eventually reaches a saturated state. Furthermore, the saturated water generated inside the water guide element, which has overflowed from the opening and moved down the water guide element, is discharged as treated water through the first drainage orifice to the outside of the container.

[0015] According to a second invention, in the first invention, an air supply pipe configured to supply gas into the container and a compressor connected to a proximal end of the air supply pipe are further provided, the container has a closed upper surface, and a water supply port, an air supply port, and an exhaust port that can be opened and closed are provided in the upper portion, and the distal end of the water supply pipe and a distal end of the air supply pipe are inserted into the container through the water supply port and the air supply port, respectively.In the second invention, since the upper surface of the container is closed, there is an effect whereby the gaseous phase having a pressure greater than atmospheric pressure is formed in the container by supplying air having a pressure greater than atmospheric pressure into the container by the compressor, in addition to the effect of the first invention.

[0016] According to a third invention, in the second invention, the container is installed to be at least partially immersed in water and its lower surface is open instead of having the first drainage orifice, and the water supply pump is a submersible pump. In the third invention, there are effects whereby the pressure of the gaseous phase formed in the container is changed by changing the water depth at which the container is installed, and whereby the position of a gas-liquid boundary surface is determined by the position of the exhaust orifice relative to the container, in addition to the effect of the second invention. Furthermore, in the third invention, when gas is continuously supplied from the air supply pipe into the container in a state where the exhaust orifice is open, excess gas is vented from the exhaust orifice and the gas in the container is constantly exchanged, so that there is an effect whereby its composition is kept constant.

[0017] According to a fourth invention, the third invention is further provided with: a pump pressurization tank in which the submersible pump is housed, a first water supply channel installed in the water to be parallel to a vertical direction and having a lower end to which the pump pressurization tank is connected and an upper end which is open, a second water supply channel installed in the water to be parallel to a horizontal direction and having an end to which the pump pressurization tank is connected, and a strainer connected to another end of the second water supply channel.In the fourth invention, when the submersible pump is operating to supply water to the container via the water supply pipe, the inside of the pump pressure tank experiences negative pressure, causing the water inside the first water supply channel to move downwards and the water inside the second water supply channel to move towards the pump pressure tank. As the water inside the second water supply channel moves, the water around the strainer is drawn into the second water supply channel.In other words, in the fourth invention, the water inside the second water supply channel moves towards the pump pressurization tank when the water inside the pump pressurization tank is drawn in by the submersible pump, which has the effect of drawing the water around the strainer into the second water supply channel, in addition to the effects of the third invention.

[0018] According to a fifth invention, in any one of the first through fourth inventions, the water guidance element comprises a folded sheet metal material. The fifth invention has the effect of simplifying the structure of the water guidance element and reducing processing costs, in addition to the effects of any one of the first through fourth inventions.

[0019] According to a sixth invention, the first invention is further provided with: a pressurization tank in which a second drainage orifice through which the treated water is discharged is provided in a lower portion and a gaseous phase is formed in an upper portion by the gas containing at least oxygen and having a pressure greater than atmospheric pressure, the pressurization tank being provided in place of the container; an air supply pipe configured to supply the gas into the pressurization tank; a compressor connected to the air supply pipe; and a drain pipe which is connected to the second drainage orifice and configured to discharge the treated water accumulated in the pressurization tank, the water guide member being installed in the pressurization tank with the opening pointing upwards. In the sixth invention, since the water guide element is installed inside the pressurization tank instead of the container, there is an effect whereby it is easy to form the gaseous phase having a higher pressure than in the case of the second invention inside the pressurization tank and the upper portion in the water guide element, in addition to the effect of the first invention.

[0020] According to a seventh invention, in the sixth invention, the water guiding element comprises a folded sheet metal material and a pair of side sheets which close the two side surfaces of the sheet metal material. In the seventh invention, there is an effect whereby the structure of the water guidance organ is simple and the cost of treatment is low, in addition to the effect of the sixth invention.

[0021] [Advantageous effects of the invention]

[0022] According to the first invention, it is possible to efficiently generate oxygen-saturated water (saturated water) and to sufficiently increase the dissolved oxygen concentration in the water. Furthermore, the first invention has a simple structure and can therefore be manufactured at low cost. When the upper surface of the container is opened, the pressure of the gaseous phase formed on the upper surface of the container is equal to atmospheric pressure, and the container does not need to have a pressure-resistant structure, thus further reducing manufacturing costs.

[0023] According to the second invention, there is an effect whereby it is possible to generate treated water having a higher dissolved oxygen concentration than in the case of the first invention in a single pass by ejecting water from the nozzle towards the internal surface of the water guide member near the opening in the state where the gaseous phase having a pressure greater than atmospheric pressure is formed in the container, in addition to the effect of the first invention.

[0024] In the third invention, a control mechanism or similar to maintain constant pressure is unnecessary since the pressure of the gaseous phase formed in the container changes according to the depth of the water at which the container is installed, and the sensor to detect the position of the gas-liquid boundary surface is also unnecessary since the position of the gas-liquid boundary surface is determined by the position of the exhaust orifice relative to the container, and thus there is an effect of reducing manufacturing cost in addition to the effect of the second invention.Furthermore, in the third invention, when gas is continuously supplied from the air supply pipe into the container in the state where the exhaust port is open, the gas in the container is constantly exchanged, and its composition is kept constant, so that there is an effect whereby a concentration of dissolved oxygen in the treated water discharged from the container is less. likely to vary. Furthermore, since the bottom surface of the container is open and the same water pressure is applied to an internal and external surface of the container, it is not necessary for the container to have a pressure-resistant structure. Consequently, the manufacturing cost is further reduced according to the third invention.

[0025] In the case where one end of a water supply pipe, having a strainer attached to the other end, is connected to a suction port of the submersible pump, the range within which the strainer can be installed is determined by the suction capacity of the submersible pump. For example, when the suction capacity of the submersible pump is low, the strainer must be installed close to the submersible pump. Furthermore, in the fourth invention, when water inside the pump's pressure tank is drawn by the submersible pump, the water inside the second water supply channel moves towards the pump's pressure tank and, consequently, the water around the strainer is drawn into the second water supply channel, regardless of the submersible pump's suction capacity. In other words, in the fourth invention, when the pump pressurization tank and the second water supply channel are installed in a benthic region of a pond, marsh, or other body of water, the strainer is installed at a distance from the submersible pump, regardless of the pump's suction capacity. This allows for the treatment of a wide range of water, in addition to the effect of the third invention. Therefore, if the container is installed at the same height as the strainer, the temperature difference between the bottom water drawn through the strainer into the second water supply channel and the treated water discharged from the container is small. Furthermore, the treated water is barely mixed with the intermediate and upper layers of water, so that only the water in the bottom zone can be treated.

[0026] According to the fifth invention, given that the structure of the water guiding element is simple and the processing cost is low, there is an effect whereby the manufacturing cost is reduced, in addition to the effects of any of the first to fourth inventions.

[0027] According to the sixth invention, there is an effect whereby treated water having a higher dissolved oxygen concentration than in the case of the second invention can be generated in a single pass by ejecting water from the nozzle towards the internal surface of the water guide near the opening in the state where the gaseous phase having a higher pressure than in the case of the second invention is formed in the pressurization tank, in addition to the effect of the first invention. Furthermore, in the sixth invention, given that the upper surface of the water guide is open and that the pressure of the gas present inside Since the water guide element is equal to the pressure of the gas forming the gaseous phase in the pressurization tank, it is not necessary for the water guide element to have a pressure-resistant structure similar to that of the pressurization tank. Therefore, according to the sixth invention, it is possible to reduce manufacturing costs by making the water guide element have a simple structure.

[0028] According to the seventh invention, since the structure of the water guidance organ is simple and the processing cost is low, there is a manufacturing cost reduction effect, in addition to the effect of the sixth invention. Brief description of the drawings

[0029] [Fig.1A] and [Fig.1B] are a front view and a side view, respectively, illustrating an aspect of a saturated water generation device according to a first embodiment of the present invention. [Fig.2A] is a schematic view illustrating an effect of the saturated water generation device shown in Figures IA and IB, and [Fig.2B] is a front view of a modification of the saturated water generation device. [Fig.3A] is an external view of a saturated water generation device according to a second embodiment of the present invention, and [Fig.3B] is a cross-sectional view taken along line AA of [Fig.3A]. [Fig.4A] is an external perspective view of a water guide element illustrated in Figures 3A and 3B, [Fig.4B] is an external perspective view of a modification of the water guide element, and [Fig.4C] is a cross-sectional view taken along line BB of [Fig.4B]. [Fig.5] is an external view of a saturated water generation device according to a third embodiment of the present invention. [Fig.6] is an external view of a saturated water generation device according to a fourth embodiment of the present invention. [Fig.7] is a graph illustrating a relationship between a quantity (OD value) of dissolved oxygen in the water treated by the saturated water generation device shown in [Fig.2B] and a water depth.

[0030] [Description of embodiments]

[0031] A saturated water generation device of the present invention will be described with reference to Figures 1 to 7. In the following description, expressions such as an "upper end", a "lower end", a "bottom plate" and a "bottom surface" are used assuming the state in which the saturated water generation device is actually installed.

[0032] [First embodiment]

[0033] Figures IA and IB are a front view and a side view, respectively, illustrating an aspect of a saturated water generation device according to a first embodiment of the present invention. As illustrated in Figures IA and IB, the saturated water generation device comprises: a container 2 in which an upper surface 2f is open and a bottom surface 2c and side surfaces 2e are closed by a bottom plate 2a and four side plates 2b, each having a rectangular shape in plan view; a water guide plate 3 which is bent so as to take a shape in which an ovoid line in a side view is partially cut out, and which is installed inside the container 2 with an opening (a portion sandwiched between a pair of end pieces 3a and 3a, and corresponds to an opening 9a illustrated in [Fig.4A]) pointing upwards; a nozzle 4 which ejects water from the top onto an internal surface 3b near the opening; a water supply pipe 5 having a distal end 5a to which the nozzle 4 is connected; a water supply pump (not shown) whose discharge port is connected to a proximal end of the water supply pipe 5; and an overflow pipe 6 connected to a first drainage port (not shown) provided in the side plate 2b near the bottom plate 2a. . The two lateral surfaces of the water guide plate 3 are closed by a pair of lateral plates 2b and 2b parallel to each other, and the water guide plate 3 is installed inside the container 2 in an inclined state such that one side of the internal surface 3b near the opening towards which the water is blown by the nozzle 4 points upwards without contact with the lateral plate 2b away from the opening out of the pair of lateral plates 2b and 2b perpendicular to the lateral surfaces. It should be noted that the water guide plate 3 has the internal surface 3b whose contour line has a shape in which an ovoid line is partially cut out in a side view of the internal surface 3b in continuity with the opening described above, but it is desirable that such a cut-out part be a portion having the smallest radius of curvature in the ovoid line, as illustrated in [Fig.1A].

[0034] As indicated by the arrows in [Fig. 1 A], the water supplied by the water supply pipe 5 to the nozzle 4 accumulates in a lower portion of the container 2, but overflows from an open end 6a of the overflow pipe 6 when a gas-liquid boundary surface (water surface 7) reaches a predetermined height. Since the container 2 has an open upper surface 2f and is in a state where the atmosphere can freely enter and exit, a gaseous phase is formed in an upper portion of the container 2 (a portion above the gas-liquid boundary surface) by the atmosphere. In the saturated water generation device, the overflow pipe 6 has the effect of maintaining the water surface 7 in the containing 2 at a constant height so that the gaseous phase forms in the upper portion of container 2.

[0035] Figure 2A is a schematic view to describe an effect of the saturated water generation device. Note that the side plate 2b positioned in front of the container 2 is not shown in Figure 2A. In the saturated water generation device, the water supplied to the nozzle 4 through the inside of the water supply pipe 5 is ejected towards the internal surface 3b near the opening relative to the water guide plate 3, as indicated by a thin arrow, and flows downwards along the internal surface 3b of the water guide plate 3 from the vicinity of one of the pair of end pieces 3a, 3a (see [Fig.1A]) as indicated by a thick arrow on [Fig.2A] while carrying the air forming a gaseous phase into the upper part of the container 2, then reverses in the lower portion of the internal surface 3b to flow upwards again along the internal surface 3b.Next, the water and air bubbles reaching the vicinity of the other end pair 3a and 3a are partially pushed into the lower side of the water guide plate 3 by the water ejected from the nozzle 4, and the remainder overflows from the water guide plate 3. Then, the water and air bubbles pushed into the lower side of the water guide plate 3 flow downwards along the inner surface 3b while again carrying air with them, then reverse to flow upwards at the level of the lowest portion of the inner surface 3b, and separate into water and bubbles to be pushed again into the lower side of the water guide plate 3 by the water ejected from the nozzle 4 and into water and bubbles to overflow from the water guide plate 3 near the opening. As described above, in the saturated water generation device, the water ejected from the nozzle 4 repeatedly flows up and down along the inner surface 3b of the water guide plate 3, carrying with it the air forming the gaseous phase in the upper portion of the container 2. This fills the inside of the water guide plate 3 with air bubbles. The oxygen in the air then increasingly dissolves in the water, resulting in the generation of water (saturated water) in which the amount of dissolved oxygen eventually reaches a state of saturation.

[0036] The saturated water generated inside the water guide plate 3 overflows from the opening of the water guide plate 3, then flows down along the external surface 3c of the water guide plate 3 (see [Fig.1A]), and is accumulated in the lower portion of the container 2. Then, the saturated water accumulated in the lower portion of the container 2 is discharged through the open end 6a of the overflow pipe 6 as treated water (treated water inside the container 2) at a time when the water surface 7 reaches the predetermined height. As described above, the saturated water generation device can efficiently generate oxygen-saturated water (saturated water) and sufficiently increase the dissolved oxygen concentration in the water. Furthermore, the saturated water generation device has a simple structure and can be manufactured at low cost. In addition, in the saturated water generation device, the upper surface 2f of container 2 is open, and the pressure of the gaseous phase formed in container 2 is equal to atmospheric pressure. Therefore, container 2 does not need a pressure-resistant structure like a pressurization tank 8, which will be described later. This further reduces manufacturing costs.

[0037] Fig. 2B is a front view of a saturated water generation device 1b according to a modification of the saturated water generation device la. As illustrated in [Fig. 2B], the saturated water generation device 1b has a structure in which the distal end 5a of the water supply pipe 5 and one end of an air supply pipe 16 are inserted into the container 2 through a water supply port (not shown) and an air supply port (not shown) provided in a top plate 2d which closes the top surface 2f in the saturated water generation device 1a, and an exhaust pipe 17 is connected to an exhaust port (not shown) provided in the top plate 2d, a compressor 18 is connected to the other end of the air supply pipe 16, and a solenoid valve 19a is installed in the exhaust pipe 17. According to such a structure, since the upper surface 2f of the container 2 is closed, air whose pressure is made greater than atmospheric pressure by the compressor 18 can be supplied into the container 2. As a result, a gaseous phase having a pressure greater than atmospheric pressure is formed inside the container 2, and it is therefore possible to generate treated water having a dissolved oxygen concentration greater than that of the saturated water generation device la in a single pass by ejecting water from the nozzle 4 towards the internal surface 3b of the water guide plate 3 near the opening.

[0038] [Second embodiment]

[0039] Figure 3A is an external view of a saturated water generation device according to a second embodiment of the present invention, and Figure 3B is a cross-sectional view taken along line AA of Figure 3A. Note that only certain lashing elements are designated by reference numerals in Figures 3A and 3B to avoid complicating the drawings. Furthermore, the components illustrated in Figures IA and IB are designated by the same reference numerals, and their description is appropriately omitted. As illustrated in Figures 3A, 3B, and 4A, the saturated water generation device comprises three water guidance elements 9 installed in the reservoir pressurization tank 8 comprising a second drainage port 20a through which the treated water is discharged is provided in a lower portion, and a gaseous phase is formed in an upper portion by air whose pressure is greater than atmospheric pressure. The pressurization tank 8 comprises a cylindrical main tank body 10 having flanges 10a at both ends and installed to be horizontal in the axial direction, and a pair of cover bodies 11 and 11 having flanges 11, respectively, and has a structure in which the flange 10a of the main tank body 10 and the flange 11 of the cover body 11 are coupled by means of a lashing member 12 having a bolt and a nut. The water guide member 9 comprises the water guide plate 3 bent so as to have a shape in which an ovoid line in a side view is partially cut out, and a pair of side plates 13 and 13 closing the two side surfaces of the water guide plate 3, and is coupled to a lower portion of a side surface 8a of the pressurization tank 8 by means of a coupling tool 14 with the opening 9a (see [Fig.4A]) pointing upwards.

[0040] The nozzles 4 ejecting water from the top towards the internal surfaces 3b (see [Fig.3B]) of the water guide plates 3 near the openings 9a (see [Fig.4A]) are connected to the distal ends 5a (see [Fig.3B]) of three water supply pipes 5 inserted into the pressurization tank 8 through water supply ports (not shown), respectively, provided in the upper portion of the pressurization tank 8.In addition, discharge ports of the water supply pumps 15 are connected to the proximal ends of the water supply pipes 5, and one end of the air supply pipe 16 and that of the air discharge pipe 17 are connected to an air supply port (not shown) and an air discharge port (not shown), respectively, provided in an upper portion of the lateral surface 8a of the pressurization tank 8. The compressor 18 is connected to the other end of the air supply pipe 16, and the solenoid valve 19a is installed in the discharge pipe 17. Furthermore, a drain pipe 20, in which the solenoid valve 19c is installed, is connected to the second drain port 20a. A water level sensor 21, which detects an upper and lower limit water level of the accumulated water inside, and a control unit (not shown), which controls the operation of the compressor 18 and the degree of opening of the solenoid valve 19a based on a reading from the water level sensor 21, are installed on the cover bodies 11 of the pressurization tank 8. In other words, the saturated water generation device has a structure in which a constant water surface height 7 is maintained by controlling the amount of gas supplied to the pressurization tank. 8 through the air supply pipe 16 and the quantity of a gas evacuated outside the pressurization tank 8 through the exhaust pipe 17 as a function of the water surface 7 inside the pressurization tank 8 detected by the water level sensor 21.

[0041] In the saturated water generation device 1, the water guide elements 9 are arranged inside the pressurization tank 8 instead of the container 2, which differs from the saturated water generation device 1b. Thus, the gaseous phase, having a higher pressure than that of the saturated water generation device 1b, can be easily formed inside the pressurization tank 8 and in the upper portion of the water guide elements 9. In this state, when water is ejected from the nozzles 4 towards the internal surfaces 3b near the openings 9a relative to the water guide plates 3 of the water guide elements 9, given that the pressure of the gaseous phase is higher than that of the saturated water generation device 1b, treated water having a higher dissolved oxygen concentration than that of the saturated water generation device 1b can be generated in a single pass.Furthermore, in the saturated water generation device, the upper surface of the water guide element 9 is open, and the air pressure inside the water guide element 9 is equal to the air pressure forming the gaseous phase in the upper portion of the pressurization tank 8. Thus, the water guide element 9 does not need to have a pressure-resistant structure similar to that of the pressurization tank 8. In other words, in the saturated water generation device, the water guide element 9 can have a simple structure comprising the water guide plate 3 and the pair of side plates 13 and 13, thereby reducing manufacturing costs.

[0042] Fig. 4A is an external perspective view of the water guide element 9, and Fig. 4B is an external perspective view of a modification of the water guide element 9. In addition, Fig. 4C is a cross-sectional view taken along line BB of Fig. 4B. As illustrated in [Fig. 4A], the saturated water generation device has a structure comprising the water guide element 9, which includes the water guide plate 3 and the pair of side plates 13 and 13, and whose opening 9a is formed by a portion surrounded by the pair of end plates 3a, 3a (see [Fig. 1A]) and the pair of side plates 13 and 13. However, the saturated water generation device is not limited to such a structure. For example, as illustrated in Figures 4B and 4C, the saturated water generation device may have a structure comprising a block-shaped water guide element 22 having a cavity 23 with an internal surface 23b whose contour line has a shape in which an ovoid line is partially cut out in a side view of the continuous internal surface 23b. with an opening 23a. In this case, the contour line of the internal surface 23b of the cavity 23 in the water guide member 22 corresponds to a contour line of the internal surface 3b in continuity with the opening 9a in the water guide plate 3 of the water guide member 9. Note that not only the saturated water generation device le, but also the saturated water generation device la and the saturated water generation device 1b can have the structure in which the water guiding element 22 is installed inside the container 2 in place of the water guiding plate 3. However, when the water guiding element 9 comprising the water guiding plate 3 is used in place of the water guiding element 22, it is advantageous to reduce the manufacturing cost, because the structure is simple and the processing cost is low.

[0043] [Third embodiment]

[0044] Figure 5 is an external view of a saturated water generation device Id according to a third embodiment of the present invention. Note that the components illustrated in Figures IA and IB and Figures 3A and 3B are designated by the same reference numerals, and their description is appropriately omitted. As illustrated in [Fig. 5], the saturated water generation device Id has an exhaust pipe 24 in which an electromagnetic valve 19b is interposed with respect to the side plate 2b of the container 2 installed such that at least part of it is immersed in the water, the bottom surface 2c being open, and a water supply orifice (not shown) and an air supply orifice (not shown) provided on the top plate 2d which closes the top surface 2f of the container 2, in place of the first drainage orifice (not shown) and the overflow pipe 6 provided in the saturated water generation device la. The distal end 5a (see [Fig.2B]) of the water supply pipe 5 is inserted into the container 2 through the water supply port, and the compressor 18 is connected to the other end of the air supply pipe 16, one end of which is connected to the air supply port.In addition, a proximal end of the water supply pipe 5 is connected to a discharge port of a submersible pump 26, which is supplied with power from an AC power source 25 via a power cable 25a, and the nozzle 4 ejecting water from the top onto the inner surface 3b of the water guide plate 3 near the opening 9a is connected to the distal end 5a (see [Fig. 2B]) of the water supply pipe 5. If a pipe branching off from the air supply pipe 16 and leading to a cavity in a rotation mechanism of a motor of the submersible pump 26 is provided to send air, the pressure of which is increased by the compressor 18, to the cavity through the pipe, it is possible to prevent a situation in which surrounding water enters the cavity and damages the motor. In this case, the submersible pump 26 does not need to be an expensive pump with resistance to the . pressure, and therefore a general purpose pump having an inexpensive structure can be used as a submersible pump 26.

[0045] In the saturated water generation device Id, when air adjusted to a pressure higher than atmospheric pressure by the compressor 18, in a state where the inside of the container 2 is filled with water, is supplied by the air supply pipe 16 inside the container 2, some of the water is pushed out of the bottom surface 2c, and a gas-liquid boundary surface (the water surface 7) moves downwards. As a result, a gaseous phase forms in an upper portion of the container 2.Therefore, when the solenoid valve 19b is opened, the air supplied by the air supply pipe 16 to the container 2 is discharged outside the container 2 through the exhaust pipe 24 at a point where the gas-liquid boundary surface reaches an exhaust port (not shown) to which the exhaust pipe 24 is connected. Consequently, the gas-liquid boundary surface does not move downwards and remains at the position of the exhaust port (not shown) to which the exhaust pipe 24 is connected. As a result, the pressure of the gas phase formed inside the container 2 is maintained constant at a level higher than atmospheric pressure. For example, if the depth between the water surface 7 and the exhaust port (not shown) to which the exhaust pipe 24 is connected is 3 m, the pressure of the gas phase described above is approximately 30 kPa (gauge pressure).

[0046] As described above, the pressure of the gaseous phase formed inside container 2 in the saturated water generation device Id changes with changing the water depth at which container 2 is installed, and therefore it is not necessary to install a control mechanism or similar device to maintain the gaseous phase at a constant pressure. Furthermore, since the position of the gas-liquid boundary surface is determined by the position of the exhaust orifice relative to container 2, a sensor for detecting the position of the gas-liquid boundary surface is also unnecessary. This reduces manufacturing costs.Furthermore, in the saturated water generation device Id, when air is continuously supplied from the air supply pipe 16 into the container 2 in a state where the exhaust port is open, excess air is expelled from the exhaust port so that the air inside the container 2 is constantly exchanged. Consequently, the gas phase composition inside the container 2 is kept constant, and therefore, the concentration of dissolved oxygen in the treated water discharged from the container 2 is less likely to vary. Moreover, since the bottom surface 2c of the container 2 is open and the same water pressure is applied to the container 2 from both the inside and the outside, the container 2 does not need to have a pressure-resistant structure. Therefore, the generation device... saturated water Id has the advantage of reducing manufacturing costs compared to the case of saturated water generation device 1b.

[0047] [Fourth embodiment]

[0048] Figure 6 is an external view of a saturated water generation device according to a fourth embodiment of the present invention. Note that the components illustrated in Figures IA and IB, Figures 3A and 3B, and Figure 5 are designated by the same reference numerals, and their description is appropriately omitted. As illustrated in [Fig. 6], the saturated water generation device has a structure which includes a pump pressurization tank 27 in which the submersible pump 26 is housed, a first water supply channel 28 which is parallel to the vertical direction and is installed in the water in a state where the pump pressurization tank 27 is connected at a lower end 28a and an upper end 28b is open, a second water supply channel 29 which is installed in the water to be parallel to the horizontal direction and has an end to which the pump pressurization tank 27 is connected, and a strainer 30 connected to the other end of the second water supply channel 29, in addition to the saturated water supply device Id.

[0049] In the saturated water generation device, when water is supplied inside the container 2 through the water supply pipe 5 by operating the submersible pump 26, the inside of the water supply tank 27 becomes under negative pressure, so that the water inside the first water supply channel 28 moves downwards and the water inside the second water supply channel 29 moves towards the pump pressurization tank 27. When the water inside the second water supply channel 29 moves, the water around the strainer 30 is drawn into the second water supply channel 29. In the case where one end of a water supply pipe, the other end of which is attached to the strainer 30, as in the second water supply channel 29, is connected to a suction port (not shown) of the submersible pump 26, the range within which the strainer 30 can be installed is determined by the suction capacity of the submersible pump 26. For example, when the suction capacity of the submersible pump 26 is low, the strainer 30 should be installed close to the submersible pump 26. On the other hand, in the saturated water generation device having the above structure, the water inside the second water supply channel 29 moves towards the water supply tank 27 when the water inside the water supply tank 27 is drawn in by the submersible pump 26, and consequently, the water around the strainer 30 is drawn into the second water supply canal 29.In other words, when the water inside the pump pressurization tank 27 is drawn in by the submersible pump 26, the water around the strainer 30 is drawn in the second. Water supply channel 29, regardless of the suction capacity of the submersible pump 26, even if the strainer 30 is installed at a distance from the submersible pump 26, means that the submersible pump 26 does not require a high suction capacity. Therefore, in the saturated water generation device, for example, the strainer 30 can be installed at a distance from the submersible pump 26, even when the suction capacity of the submersible pump 26 is low.

[0050] As described above, if the pump pressurization tank 27 and the second water supply channel 29 in the saturated water generation device are installed in a benthic region of a pond, marsh, or similar body of water, the strainer 30 is installed at a distance from the submersible pump 26, regardless of the suction capacity of the submersible pump 26, so that a wide range of water can be treated. Therefore, if the container 2 is installed at the same height as the strainer 30, the temperature difference between the bottom water drawn into the second water supply channel 29 from the strainer 30 and the treated water discharged from the container 2 is small, and the treated water is barely mixed with the intermediate and upper water, so that only the water from a bottom water zone can be treated.In addition, a water surface 28c inside the first water supply channel 28 is less than the surrounding water surface 7 during the operation of the submersible pump 26. Thus, in the saturated water generation device, it is possible to easily check the operating status of the submersible pump 26 installed near a benthic region of a lake, marsh or similar by visually checking a height of the water surface 28c. Although [Fig.6] illustrates container 2 constituting the saturated water generation device Id illustrated in [Fig.5] as container 2 constituting the saturated water generation device le, container 2 constituting the saturated water generation device 1b illustrated in [Fig.2B] can also be used as container 2 of the saturated water generation device le.

[0051] Table 1 shows the saturated quantity of dissolved oxygen in distilled water at 1 atm for each temperature. However, a column represents a decimal part of the temperature, and a row represents a whole number part of the temperature. For example, the saturated quantity of dissolved oxygen (unit: mg / L) when the temperature of the distilled water is 9.2°C is a value of 11.14, described in a section where a row of 9 and a column of 0.2 intersect. Note that the saturated quantity of dissolved oxygen when the oxygen pressure in contact with the distilled water is 1.04 atm (corresponding to a water depth of 0.4 m) is obtained by multiplying 11.14 by 1.04. Table 2 shows the oxygen pressure, water depth, and temperature (unit: °C) at which the pressure is generated, and theoretical values ​​for the saturated quantity of dissolved oxygen (OD value in mg / L). In addition, values ​​of The effective measurements in the table indicate the results obtained by measuring the amount of dissolved oxygen (OD value in mg / L units) in the treated water while changing the air pressure ejected from nozzle 4 in the saturated water generation device 1b. Note that tap water is used instead of distilled water in the experiment.

[0052] [Tables 1] 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 7 11.75 11.73 11.70 11.67 11.64 11.61 11.58 11.55 11.52 11.50 8 11.47 11.44 11.41 11.38 11.36 11.33 11.30 11.27 11.25 11.22 9 11.19 11.16 11.14 11.11 11.08 11.06 11.03 11.00 10.98 10.95

[0053] [Tables2] Water depth 0.4 1.0 2.0 3.0 3.5 Temperature 9.2 8.1 8.0 7.6 7.3 Air pressure 1.04 1.1 1.2 1.3 1.35 Theoretical value 11.58 12.58 13.76 15.05 15.75 Actual measured value 11.94 12.66 13.33 14.44 15.45

[0054] Figure 7 is a graph in which the theoretical and actual measured values ​​shown in Table 2 are plotted for each water depth. However, the horizontal axis represents the water depth and the vertical axis represents the OD value (unit: mg / L). Furthermore, the black circles indicate the actual measured values, and the white diamonds indicate the theoretical values. Figure 7 illustrates that the saturated water generation device 1b generates saturated water corresponding to an air pressure solely by supplying air adjusted to the air pressure below a desired water depth in the container 2 without using pure gaseous oxygen. In this case, since it is not necessary to use pure gaseous oxygen, the cost required for generating saturated water is reduced.In other words, according to the saturated water generation device 1b, the saturated water corresponding to the air pressure below the desired water depth can be generated easily and inexpensively. It should be noted that such an effect in the saturated water generation device 1b is similarly manifested in the saturated water generation devices le to le. capable of adjusting an air pressure inside the water guide organ 9 to a pressure greater than atmospheric pressure.

[0055] [Industrial applicability]

[0056] The present invention applies to a case where water is purified by increasing the amount (OD value) of dissolved oxygen in the water in a lake, marsh, seafood aquaculture farm, wastewater treatment plant, or similar. List of reference signs

[0057] the saturated water generation device 2 containers 2a base plate 2b side plate 2c bottom surface 2nd top plate 2nd lateral surface 2f upper surface 3 water guide plate 3 a extremity 3b internal surface 3c external surface 4 nozzles 5 water supply pipe 5a distal end 6 overflow pipe 6a open end 7. Water surface 8 pressurization tank 8a lateral surface 9. Water guidance system 9a opening 10 main tank body 10a flange 11 bodies covering the flange 12. Lashing device 13 side plate 14 coupling tool 15 water supply pump 16 air supply pipe 17 exhaust pipe 18 compressor 19a to 19c electromagnetic valve 20 drainage pipe 20a second drainage orifice 21 water level sensor 22 water guidance device 23 cavity 23a opening 23b internal surface 24 exhaust pipe 25 AC power supply 25a power cable 26 submersible pump 27 pump pressurization tank 28th first water supply canal 28a lower end 28b lower end 28°C water surface 29 second water supply canal 30 strainer

Claims

Demands

1. Saturated water generation device (la, 1b, le, Id, le) comprising: a container (2) in which a bottom surface (2c) and a side surface (2e) are closed, a first drainage orifice through which the treated water is discharged is provided in a lower portion, and a gaseous phase is formed in an upper portion by a gas containing at least oxygen; a water guiding element (9, 22) which is installed in the container (2) with an opening (9a, 23a) pointing upwards and which has an internal surface whose contour line has a shape in which an ovoid line is partially cut out in a side view of the internal surface in continuity with the opening (9a, 23a); a nozzle (4) configured to eject water from the top towards the internal surface (3b, 23b) near the opening (9a, 23a); a water supply pipe (5) having a distal end (5a) to which the nozzle (4) is connected;and a water supply pump having a discharge port connected to a proximal end of the water supply pipe (5), in which the treated water is stored in the lower portion of the container (2).

2. Saturated water generation device (1b, Id, le) according to claim 1, further comprising: an air supply pipe (16) configured to supply gas into the container (2); and a compressor (18) connected to a proximal end of the air supply pipe (16), wherein the container (2) has a closed upper surface (2f), and a water supply port, an air supply port, and an exhaust port that can be opened and closed provided in the upper portion, and the distal end (5a) of the water supply pipe (5) and a distal end of the air supply pipe (16) are inserted into the container (2) through the water supply port and the air supply port, respectively.

3. Saturated water generation device (Id, the) according to claim 2, wherein

4.

5.

6. the container (2) is installed to be at least partially immersed in water and its bottom surface (2c) is open instead of having the first drainage hole, and The water supply pump is a submersible pump (26). The saturated water generation device (the) according to claim 3, further comprising: a pump pressurization tank (27) in which the submersible pump (26) is housed; a first water supply channel (28) installed in the water to be parallel to a vertical direction and having a lower end to which the pump pressurization tank (27) is connected and an upper end which is open; a second water supply channel (29) installed in the water to be parallel to a horizontal direction and having one end to which the pump pressurization tank (27) is connected; and a strainer (30) connected to another end of the second water supply channel (29). Saturated water generation device (la, 1b, le, Id, le) according to any one of claims 1 to 4, wherein the water guiding member (9, 22) comprises a folded sheet metal material. Saturated water generation device (the) according to claim 1, further comprising: a pressurization tank (8) in which a second drainage port (20a) through which the treated water is discharged is provided in a lower portion and a gaseous phase is formed in an upper portion by the gas containing at least oxygen and having a pressure greater than atmospheric pressure, the pressurization tank (8) being provided in place of the container (2); an air supply pipe (16) configured to supply gas into the pressurization tank (8); a compressor (18) connected to the air supply pipe (16); and a drain pipe (20) which is connected to the second drain port (20a) and configured to discharge the treated water accumulated in the pressurization tank (8), in which the water guidance device (9, 22) is installed in the pressurization tank (8) with the opening pointing upwards. 24

7. Saturated water generation device according to claim 6, wherein the water guiding member (9, 22) comprises a folded sheet material and a pair of side sheets which close the two side surfaces of the sheet material.

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