JP2007209883A - Water quality improvement apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water quality improvement apparatus which can increase amount of dissolved oxygen into further more retaining water at the bottom layer part, without increasing sizes of machines themselves like a compressed air supply device generating bubbles. <P>SOLUTION: The water quality improvement apparatus is provided with a compressed air chamber 4 having a space storing retaining water of the bottom part 2 of a closed water area 1 and high pressure compressed air 3; an air introducing part 17 sending compressed air 3 into the compressed air chamber 4; and a discharge part 20 discharging the compressed air 3 from the compressed air chamber 4. Following the stream of the compressed air 3 sent from the air introducing part 17 to the compressed air chamber 4, rising toward the water surface of the closed water region 1 from the discharge part 20 as bubbles, the retaining water in the compressed air chamber 4 is discharged from the discharge part 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water quality improvement device for improving the quality of stagnant water that has accumulated in closed water areas such as inland seas, harbors, lakes, ponds, moats, reservoirs, farms, aquariums, septic tanks, etc. The present invention relates to a water quality improvement device that improves a good oxygen-dissolved state by sending high-pressure compressed air to the remaining stagnant water in the bottom layer.

  Conventionally, since it is difficult to exchange water in closed water areas such as inland seas, harbors, lakes, ponds, moats, reservoirs, aquaculture farms, aquariums, and purification transports, the amount of dissolved oxygen in the water is extremely low, so organic matter is decomposed It is difficult to do so, and a large amount of bottom mud containing organic components accumulates on the bottom of the water. The bottom mud containing such organic components causes water pollution such as eutrophication, and the deterioration of the habitat environment and the influence of odor on the surroundings have been problems.

  Therefore, in a closed water area, in order to improve the water quality, a water quality improvement device that forcibly causes convection with surface water while supplying oxygen to the bottom water is used.

  For example, as shown in FIG. 13, a water quality improvement device used in a closed water area with a relatively shallow water depth is provided with a rotating shaft body 50 installed at the bottom of the water and one end attached to the rotating shaft body 50. A long tubular body 51 extending substantially horizontally from the rotary shaft body 50, a compressed air supply means 52 for supplying compressed air to the long tubular body 51, and from the compressed air supply means 52 to the long tubular body 51. A pipe 53 for sending compressed air and an injection hole 54 for blowing out the compressed air in a predetermined direction. The injection hole 54 applies a thrust in the rotational direction to the long tubular body 51 by blowing out the compressed air. It is known that it can be applied and is arranged so as to form a rising water flow on the long tubular body 51 (see Patent Document 1).

  As a result, the compressed air W blown from the long tubular body 51 rises in the water while rotating the long tubular body 51 by blowing out compressed air while having a simple structure. By forming the water flow that raises the bottom water in the rotation range, the water quality in the rotation range of the long tubular body 51 can be improved.

  Further, as a relatively large water quality improvement device used in a closed water area having a relatively deep water depth, a water supply pump 60 that pumps up and sends out stagnant water from the closed water area as shown in FIG. The water sent out from the water is introduced as driving water, and a bubble generator 61 that accepts a gas containing at least oxygen in the water and sends out the water mixed with fine bubbles is provided on the ground. It is known that the bubble-mixed water that has been sent out is introduced as drive water, and a jet pump 62 that injects the surrounding stagnant water together with the bubble-mixed water is installed at the bottom of the closed water area (Patent Document). 2).

Thereby, the bubbles after being jetted from the jet pump 62 do not rise early, and the water containing the bubbles can reach far away, so that the dissolution efficiency of oxygen in the stagnant water is good and the closing property Circulate stagnant water throughout the water area.
JP 2000-317490 A JP 2005-262200 A

  However, in the water quality improvement apparatus described in Patent Document 1, the length of the long tubular body 51 must be increased when attempting to expand the range of improving the water quality. Since the resistance force of water when the body 51 rotates in water increases, the strength of the long tubular body 51 must be increased and the supply amount of compressed air supplied from the compressed air supply means 52 must be increased. I must. However, the water quality improvement device described in Patent Document 1 has a limit in the size of the long tubular body 51 due to its structure, and even if a plurality of water quality improvement devices are used, the application is small. It was limited to improving water quality in closed water areas such as large reservoirs and farms.

  Moreover, in the water quality improvement apparatus described in Patent Document 2, in order to effectively exhibit the performance, the bottom layer portion is retained so that the water mixed with bubbles from the outlet of the jet pump 62 reaches far away. The water must be injected at a high pressure. For that purpose, a large-capacity bubble generator 61, a water pump 60 and a jet pump 62 are required, and in order to improve the water quality in a wider range, a plurality of such large-scale water quality improvement devices are used. Therefore, there is a problem that the cost for the mechanical equipment increases.

  Therefore, in order to solve the problems of the conventional water quality improvement apparatus as described above, the present invention does not increase the capacity of a machine itself such as a compressed air supply apparatus that generates bubbles, and more stagnation of the bottom layer portion. It is an object of the present invention to provide a water quality improvement device capable of increasing the amount of oxygen dissolved in water.

  In order to achieve the above-mentioned object, the invention described in claim 1 includes a compressed air chamber having a space capable of storing stagnant water and high-pressure compressed air in a bottom layer portion of a closed water area, and compressed air in the compressed air chamber. A water quality improvement device having an air introduction section for feeding in and a discharge section for discharging compressed air in the compressed air chamber, wherein the compressed air in the compressed air chamber is widely contacted with retained water in the bottom layer portion The oxygen is dissolved by the air, and the compressed air sent from the air introduction part to the compressed air chamber becomes a bubble from the discharge part and rises in the water surface direction of the closed water area. The stagnant water is discharged from the discharge section.

  The invention according to claim 2 is a compressed air chamber having a space capable of storing the stagnant water in the bottom layer portion of the closed water area and the high-pressure compressed air, and an air introducing portion for sending the compressed air into the compressed air chamber. A water quality improvement device having a discharge part for discharging compressed air in the compressed air chamber, wherein the compressed air chamber is formed by a three-dimensional cover body having an open bottom and a bottom of the closed water area. The compressed air can be discharged by using a contact portion between the opening edge of the cover body and the bottom of the closed water area as the discharge portion.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, the compressed air chamber has a water introducing portion for introducing the retained water in the bottom layer portion, and the flow of the compressed air Accordingly, the stagnant water outside the compressed air chamber is continuously introduced from the water introduction part and discharged from the discharge part.

  According to a fourth aspect of the present invention, in addition to the configuration according to the third aspect, a partition wall that extends downward from the ceiling portion of the compressed air chamber is provided between the water introduction portion and the discharge portion. A contact interface that separates the stagnant water and the compressed air is formed by a balance between water pressure and air pressure.

  According to a fifth aspect of the invention, in addition to the configuration of the fourth aspect, at least one partition wall is provided between the water introduction portion and the partition wall, and the partition wall and the partition wall or the partition wall and the partition wall are provided. The height of the partition wall is set so that the water level in the section partitioned by is higher as the water level is closer to the discharge part.

  According to a sixth aspect of the present invention, in addition to the configuration according to the fourth or fifth aspect, a plurality of the compressed air chambers are arranged vertically, and the lower compressed air chamber and the upper compressed air chamber communicate with each other. It is characterized by being connected by.

  In addition to the structure of Claim 4 or 5, the invention of Claim 7 has the said compressed air chamber arrange | positioned in parallel, and has the said water introduction part in the one end part of each compressed air chamber. The other end of each compressed air chamber is integrated by a connecting member having the discharge port.

  According to an eighth aspect of the present invention, in addition to the configuration of the fourth or fifth aspect, the water introduction portion and the air introduction portion are provided at the center of the bottom surface of the compressed air chamber, and the outer periphery of the compressed air chamber is provided. The discharge part is provided in the part, and a stirring device capable of stirring the contact interface is provided.

  Since the present invention has the above-described configuration, according to the first aspect of the present invention, the compressed air sent from the air introduction portion into the compressed air chamber comes into contact with the retained water and the compressed air. A contact interface having a sufficient size is formed, and this boundary interface promotes the supply of oxygen to the stagnant water, and also becomes a flow that rises in the direction of the water surface of the closed water area as a bubble via the discharge part. At the same time, the stagnant water in the compressed air chamber is discharged from the discharge portion, so that oxygen is dissolved in the stagnant water during the bubble rising process, so that the stagnant water and the compressed air are sufficiently large to come into contact with the compressed air chamber. A contact interface having an air flow is formed, and the supply of oxygen to the stagnant water is promoted by this boundary interface. Therefore, a larger number of bottom layers can be obtained without increasing the size of the machine itself such as an air compression device that generates bubbles. Retention of Water quality improvement device capable of increasing the amount to dissolve oxygen into the can be provided.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the cover body for forming the compressed air chamber need only have a simple structure. Is less. In addition, since the discharge part of the compressed air is located at the bottom of the closed water area, the compressed air will enter the bottom of the bottom, and the oxygen will dissolve into the retained water contained in the bottom of the water as well as reforming the bottom. Useful.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, the accumulated water in the bottom layer introduced from the water introduction part is discharged from the discharge part along with the flow of compressed air. By reaching the water surface portion, it is possible to generate a continuous circulation flow in which surface water is introduced into the water introduction portion, so that the water quality in the closed water area is improved more efficiently.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, since the water level in the compressed air chamber is defined by the lower end portion of the partition wall, the contact interface is formed. As a result, the contact area between the staying water and the compressed air can be made sufficiently large, and oxygen can be easily dissolved in the staying water, so that the water quality in the closed water area can be improved more efficiently.

  According to the invention of claim 5, in addition to the effect of the invention of claim 4, compressed air bubbles are generated from the lower end of the partition wall in the stay water every time the stay water passes through the partition wall, Oxygen easily dissolves in the accumulated water due to vortices and turbulence generated when the bubbles are repelled, so that the water quality in the closed water area is improved more efficiently.

  According to the invention described in claim 6, in addition to the effect of the invention described in claim 4 or 5, a plurality of compressed air chambers are provided, and a contact interface is formed for each of the compressed air chambers. Since the contact area with the compressed air can be made sufficiently large, the water quality of the closed water area can be improved more efficiently.

  According to the invention described in claim 7, in addition to the effect of the invention described in claim 4 or 5, a plurality of compressed air chambers are provided, and a contact interface is formed for each of the compressed air chambers. Since the contact area with the compressed air can be made sufficiently large, the water quality of the closed water area can be improved more efficiently.

  According to the invention described in claim 8, in addition to the effect of the invention described in claim 4 or 5, even when a plurality of discharge ports are provided in the outer peripheral portion of the compressed air chamber, A water quality improvement apparatus can be completed by providing one air introduction part in the center part of a compressed air chamber. In addition, turbulent flow can be generated at the contact interface by the stirring operation of the stirring device, and high-pressure compressed air can be mixed with the stagnant water. As a result, the dissolution of oxygen is promoted, and the water quality improvement effect is further enhanced.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 of the Invention

  First, the structure of the water quality improvement apparatus according to Embodiment 1 of the present invention will be described.

  FIG. 1 is a front view showing a partial cross section of a water quality improvement apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG.

  FIG. 1 shows a state where a water quality improvement tank 5 having a compressed air chamber 4 having a space in which compressed air 3 can be stored is installed in the bottom layer portion 2 of the closed water area 1. The water quality improvement tank 5 is a rectangular parallelepiped surrounded by the top plate 6, the floor slab 7, and the side wall 8, and is installed on the upper surface of the foundation 10 provided to eliminate the unevenness of the bottom 9. The water quality improvement tank 5 may be integrally formed, and the top plate 6, the floor plate 7, the side wall 8 and the like may be formed of separate members. The water quality improvement tank 5 preferably has a structure capable of withstanding its buoyancy by its own weight, but may be added with heavy suspension in addition to being fixed with a pile or an anchor material as necessary. The material is preferably made of concrete having a relatively high mass and durability in water, or steel with anticorrosion coating, or a combination thereof.

  At one end in the longitudinal direction of the floor slab 7 of the water quality improvement tank 5, there is a water introduction part 13 for introducing the accumulated water 12 located in the bottom layer part 2 of the closed water area 1 into the compressed air chamber 4. In the water introduction part 13, a strainer 14 having a fine mesh is provided so that mud in the bottom 2 and dirt in the water do not enter the compressed air chamber 4. In addition, air for introducing high-pressure compressed air 3 into the compressed air chamber 4 from the air compressor 15 provided in the atmosphere through a pipe 16 at one end of the floor slab 7 of the water quality improvement tank 5. An introduction part 17 is provided. The air introduction part 17 has a tubular shape, passes through the strainer 14 and is taken into the compressed air chamber 4 from the water introduction part 13, and a plurality of compressed air ejection holes 18 are formed around it. . The pipe 16 can be a steel pipe that is easy to fix, a rubber hose that is flexible and easy to pipe, or a resin hose.

  The top plate 6 of the water quality improvement tank 5 corresponding to the opposite side of the water introduction part 13 has a discharge part 20 from which the compressed air 3 and the accumulated water 12 can be discharged. A partition wall 21 that forms a vertical plane is provided between the compressed air chamber 4 and the discharge unit 20. The partition wall 21 determines the water level of the contact interface S between the compressed air 3 and the retained water 12 introduced into the compressed air chamber 4 and the compressed air 3 introduced into the compressed air chamber 4 at the lower end thereof. The lower part of the partition wall 21 is a communication port 22 between the compressed air chamber 4 and the discharge part 20. The lower end portion of the partition wall 21 is inclined in the thickness direction so that the compressed air 3 can easily move toward the discharge portion 20 side, and the compressed air 3 is formed by forming, for example, serrated irregularities when viewed from the front. It is preferable that the bubbles B are easily generated when passing through the lower end of the partition wall 21.

  By providing the discharge part 20 with a cylindrical extension part 23 extending upward from the partition wall 21, the flow of the compressed air 3 and the accumulated water 12 discharged from the discharge part 20 is directed in a specific direction, and the air It is advisable to promote the lift effect.

  The compressed air 3 may be fed into the compressed air chamber 4 continuously using an automatic control device (not shown) provided in the air compressor 15 or intermittently. In FIG. 1, the air compressor 15 is installed on a gantry 25 supported by a footnote 24 provided on the top of the top plate 6 of the water quality improvement tank 5, but is installed on a land near the water quality improvement tank 5. Also good.

  If a transparent acrylic resin or the like is used for the top plate 6 of the water quality improvement tank 5, it becomes possible to promote the breeding of seafood and seaweeds at places where the water depth is shallow and irradiation with sunlight can be expected. The growth environment of green plants is improved, and oxygen release by photosynthesis of living organisms is not impaired.

  Next, the operation of the water quality improvement apparatus according to Embodiment 1 of the present invention will be described.

  When the water quality improvement tank 5 is submerged into the bottom 9 of the closed water area 1 while maintaining the horizontal posture from the atmosphere and installed on the foundation 10, the compressed air 3 immediately after that has not yet been sent into the compressed air chamber 4. In the state, the stagnant water 12 located in the bottom layer portion 2 of the closed water area 1 enters the compressed air chamber 4 from the water introducing portion 13 by water pressure, and the pressure of the atmospheric air confined in the compressed air chamber 4 and the closed air A contact interface S is formed at a position where the water pressure in the water area 1 is balanced. That is, the height of the partition wall 21 is set so that the contact interface S is formed at a position higher than the lower end portion of the partition wall 21 (position close to the water surface).

  Therefore, when the air compressor 15 is operated to produce the high-pressure compressed air 3 with the air compressor 15 and the compressed air 3 is fed into the compressed air chamber 4 from the ejection hole 18 of the air introduction portion 17, Since the contact interface S is exposed to the compressed air 3 in the compressed air chamber 4, oxygen is dissolved, and the compressed air 3 exiting from the ejection holes 18 passes through the retained water 12 in the compressed air chamber 4 to generate bubbles. B is raised by buoyancy and released to the compressed air 3 in the compressed air chamber 4. Thereby, oxygen is supplied to the staying water 12 by exposing the compressed air 3 to the staying water 12, and the quality of the staying water 12 of the bottom layer part 2 is improved. As the amount of compressed air 3 in the compressed air chamber 4 increases, the pressure of the compressed air 3 increases, and the level of the retained water 12 (position of the contact interface S) in the compressed air chamber 4 gradually decreases. Eventually, it coincides with the position of the lower end of the partition wall 21.

  Thereafter, when the high-pressure compressed air 3 is continuously sent to the compressed air chamber 4, the compressed air 3 is discharged to the discharge portion 20 through the communication port 22 below the partition wall 21. The compressed air 3 discharged from the discharge unit 20 becomes a bubble B by passing through the partition wall 21 and rises toward the water surface having a low water pressure due to its buoyancy. As the compressed air 3 rises, the remaining water 12 flows together toward the water surface. Thereby, oxygen is supplied to the staying water 12 when the staying water 12 is exposed to the high pressure compressed air 3, and the quality of the staying water 12 of the bottom layer part 2 is improved.

Since the stagnant water 12 discharged from the discharge unit 20 to the water surface is changed in the horizontal direction on the water surface, the surface layer water in the surface layer portion moves in the horizontal direction. On the other hand, when the high-pressure compressed air 3 is continuously sent to the compressed air chamber 4, the compressed air 3 and the accumulated water 12 in the compressed air chamber 4 are discharged through the communication port 22 below the partition wall 21. Since the pressure of the water introduction part 13 on the opposite side is lowered by being discharged to the part 20, the accumulated water 12 in the bottom layer part 2 is introduced into the water introduction part 13 from one to the next. Therefore, the surface layer water in the surface layer portion of the closed water area 1 moves to the water introduction portion 13 provided near the bottom 9, and as a result, the accumulated water 12 in the bottom layer portion 2 moves to the surface layer water in the surface layer portion. When the surface layer water in the surface layer portion moves to the accumulated water 12 in the bottom layer portion 2, the convection performed is generated. Thereby, the water quality of the closed water area 1 is improved by replacing the stagnant water 12 of the bottom layer 2 and the surface water of the surface layer.
[Embodiment 2 of the Invention]

  Next, the configuration of the water quality improvement apparatus according to Embodiment 2 of the present invention will be described.

  FIG. 3 is a front view showing a partial cross section of the water quality improving apparatus according to Embodiment 2 of the present invention. 4 is a cross-sectional view taken along line BB in FIG.

  As shown in FIG. 3, a plurality of partition walls 26 are provided between the water introduction part 13 and the partition wall 21, and the compressed air chamber partitioned by the partition wall 26 and the partition wall 21 or the partition wall 26 and the partition wall 26. The height of the partition wall 26 is set so that the water level in 4 is higher as the water level is closer to the discharge part 20 (in this case, the water depth H has a relationship of H1> H2> H3> H4> H5). Further, the lower end portion of the partition wall 26 is inclined in the thickness direction so that the compressed air 3 can easily move to the discharge portion 20 side, and the compressed air 3 is formed by forming, for example, serrated irregularities when viewed from the front. It is preferable that the bubbles B are easily generated when passing under the partition wall 21.

  In the example shown in FIG. 3, by providing such a plurality of partition walls 26, the water quality reforming tank 5 in which a plurality of compressed air chambers 4 are arranged in series is further arranged in parallel in FIG. , Trying to improve the water quality improvement performance more. In this case, each water quality improvement tank 5 has a water introduction part 13 at one end in the longitudinal direction, and the other end in the longitudinal direction of the water quality improvement tank 5 is integrated by a connecting member 27 having a discharge port 20. Yes.

  Since the other structure is the same as that of the water quality improvement apparatus which concerns on Embodiment 1, the same code | symbol is attached | subjected to the same structure and the description is abbreviate | omitted.

  Next, the operation of the water quality improvement apparatus according to Embodiment 2 of the present invention will be described.

  3 and 4, when the high-pressure compressed air 3 is continuously fed into the first compressed air chamber 4 a at the left end near the water bottom 9 from the ejection hole 18 of the air introduction portion 17, the water level reaches the lower end portion of the partition wall 26. Is pushed down, and the compressed air 3 stored in the first compressed air chamber 4a moves to the second compressed air chamber 4b. At this time, the compressed air 3 becomes bubbles B and passes through the accumulated water 12. It is discharged to the second compressed air chamber 4b. Similarly, the compressed air 3 stored in the second compressed air chamber 4b moves to the third compressed air chamber 4c. At this time, the compressed air 3 becomes bubbles B and passes through the staying water 12. It is discharged into the third compressed air chamber 4c. Similarly, the compressed air 3 sequentially moves to the fourth compressed air chamber 4d and the fifth compressed air chamber 4e.

  In the second embodiment, contact interfaces S1, S2, S3, S4, and S5 are formed in each compressed air chamber, and the compressed air is compressed to the same pressure as the water pressure. Of oxygen is dissolved in the retained water 12. In addition, oxygen in the compressed air 3 is dissolved in the stagnant water 12 due to vortices and turbulent flow caused by the bubbles B generated in the vicinity of the partition wall 26 being repelled on the water surface. The amount of oxygen dissolved in the stagnant water 12 is increased, and the water quality is further improved.

  The water quality improvement tank 5 shown in FIG. 3 has a uniform cross section, and the height of the partition wall 26 is adjusted so that the water level in the compressed air chamber 4 of each section is sequentially increased. As shown in FIG. 6, each compressed air chamber 4 is composed of a unitized water quality improvement tank 5u having a water introduction part 13 and a discharge part 20, and the water quality improvement tanks 5u are cascaded to form a compressed air chamber. The discharge part 20 of the water quality improvement tank 5u with the lower water level in 4 may be connected to the water introduction part 13 of the water quality improvement tank 5u with the higher water level in the compressed air chamber 4. In this case, since a desired water quality improvement device can be obtained by combining the water quality improvement tanks 5u having the same form, manufacture is facilitated.

  The water quality improvement tank 5u shown in FIGS. 5 and 6 is characterized in that it does not have the floor slab 7 corresponding to the bottom surface.

  When the rectangular parallelepiped water quality reforming tank 5 surrounded by the top plate 6, the floor slab 7 and the side wall 8 is installed on the foundation 10 provided on the bottom 9, the foundation 10 is of course a solid foundation. Even if an independent or continuous foundation (frame) is used, there is almost no space between the water bottom 9 and the floor plate 7 of the water quality reforming tank 5, and thus the activation of the water bottom 9 is inhibited.

On the other hand, like the water quality improvement tank 5u shown in FIG.5 and FIG.6, the lower end part of the side wall 8 of the water quality improvement tank 5u which does not have the floor slab 7 equivalent to a bottom face part was installed in the water bottom 9. If the structure supported by the pedestal 28 is adopted, oxygen can be dissolved in the stagnant water 12 between the bottom 9 and the water quality improvement tank 5u by the high-pressure compressed air 3, which can be improved to a good oxygen-dissolved state. It becomes possible.
Embodiment 3 of the Invention

  FIG. 7: is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 3 of this invention. 8 is a cross-sectional view taken along the line DD of FIG.

  FIG. 7 shows an example in which a plurality of compressed air chambers 4 are arranged vertically. The lower compressed air chamber 4L and the upper compressed air chamber 4U communicate with each other by a connecting portion 19 that connects the discharge portion 20 of the lower compressed air chamber 4L and the water introduction portion 13 of the upper compressed air chamber 4U. . Between the water inlet 13 of the lower compressed air chamber 4L and the partition wall 21 of the lower compressed air chamber 4U, and the water inlet 13 of the upper compressed air chamber 4U and the partition wall 21 of the upper compressed air chamber 4U A plurality of partition walls 26 are provided between them, and the water levels in the compressed air chambers 4a, 4b, 4c, 4d, 4e, 4f partitioned by the partition walls 26 and the partition walls 21 or the partition walls 26 and the partition walls 26 are determined. The height of the partition wall 26 is set so as to be higher as it is closer to the discharge unit 20 (in this case, the water depth H has a relationship of H1> H2> H3> H4> H5> H6).

  Immediately before the partition wall 21 and the partition wall 26, a water purification material 30 in which activated carbon or oyster shells are packed in a net bag is arranged to promote improvement in water quality. Since the water purification material 30 can be washed and replaced in a net bag unit, maintenance is easy.

  In the example shown in FIG. 7, the hierarchy is two stages, but the number of stages may be increased in a deep water place.

In this case, due to an increase in the contact area between the compressed air 3 and the stagnant water 12 and the vortices and turbulence caused by the bubbles B generated near the partition wall 26 repelling on the water surface, the oxygen in the compressed air 3 is absorbed in the stagnant water 12. Since the opportunity to melt | dissolve can also be increased, the improvement of water quality is promoted, without increasing the installation area of the water quality improvement tank 5. FIG.
[Embodiment 4 of the Invention]

  FIG. 9 is a front view of a partial cross section of a water quality improvement apparatus according to Embodiment 4 of the present invention.

  In FIG. 9, the water introduction part 13 is provided in the center of the floor slab 7 of the compressed air chamber 4 at the center of the water quality improvement tank 5, and the partition walls 26 are provided on the left and right side walls 8, 8 of the compressed air chamber 4 at the center. , 26, and the discharge portions 20 are respectively provided outside the left and right compressed air chambers 4 of the water quality improvement tank 5.

  A stirring blade having a vertical rotating shaft 31 in the central compressed air chamber 4 below the lower end of the partition wall 26 and capable of forcibly stirring the stay water 12 contact interface S in the compressed air chamber 4. 29 is rotatably provided. A plurality of stirring blades 29 arranged at equal intervals in the circumferential direction are fixed to the lower end portion of the rotating shaft 31 via the support arm 30, and the central portion of the rotating shaft 31 is provided on the top plate 6 of the water quality improvement tank 5. A drive supported by a bearing 32 and having an upper end connected to a drive shaft (not shown) of a drive motor 34 fixed to a drive unit base 33 provided on the top plate 6 of the water quality improvement tank 5 at the upper end of the rotary shaft 31. It is rotated by the transmission unit 35. The rotating shaft 31 has a hollow shape, and a pipe 16 for supplying the compressed air 3 is connected to an upper end of the rotating shaft 31 via a universal joint 36. The compressed air 3 supplied from the pipe 16 passes through the hollow portion of the rotating shaft 31, passes through the air introduction portion 17 from the support arm 30 to the back surface of the stirring blade 29, and is formed upward on the back surface of the stirring blade 29. In addition, the air is discharged from the jet hole 18 into the compressed air chamber 4.

  Thereby, by the stirring operation which stirs the contact interface S by the stirring blade 29, a turbulent flow is generated in the contact interface S, and the high-pressure compressed air 3 can be mixed with the stagnant water 12. As a result, oxygen is dissolved. It is promoted and the water quality improvement effect increases. The stagnant water 12 in the compressed air chamber 4 in the center of the water quality improvement tank 5 is blown into the stagnant water 12 by the agitating blade 29 because the high-pressure compressed air 3 is blown in while being agitated by the agitating blade 29. Oxygen dissolution is promoted as much as the flow is generated, and the water quality improvement effect is further enhanced.

In the example illustrated in FIG. 9, the drive motor 34 and the drive transmission unit 35 that are the drive system of the stirring blade 29 are provided in the water, but may be installed on the water.
[Embodiment 5 of the Invention]

  FIG. 10: is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 5 of this invention.

  In FIG. 10, the water introduction part 13 is provided at the center of the floor slab 7 of the compressed air chamber 4 of the water quality improvement tank 5, and the discharge parts 20, 20 are provided on the left and right side walls 8, 8 of the compressed air chamber 4. is doing. Partition walls 21 and 21 are provided between the left and right discharge parts 20 and 20 and the compressed air chamber 4, respectively.

  In FIG. 10, the water quality improvement tank 5 is suspended from a trolley 37 floating on the water surface by a suspension member 38 such as a wire so that it can be installed on the bottom layer 2 of the closed water area 1.

  An air compressor 15 is installed on the carriage 37. A screw member 40 having a horizontal rotating shaft 39 capable of forcibly stirring the contact interface S which is the surface of the staying water 12 is rotatably provided in the central portion of the compressed air chamber 4. One end of the screw member 40 is connected to a screw drive device 41 provided on the top plate 6 of the water quality improvement tank 5 in the center of the compressed air chamber 4, and the other end of the screw member 40 is connected to the water quality improvement tank. 5 is supported by a bearing 43 provided on a suspension support member 42 provided downward from the top plate 6. It is desirable that the screw member 40 has such a length that the other end portion approaches the partition wall 21. Further, the direction of rotation of the screw member 40 is determined so that the flow of water at the contact interface S, which is the surface of the accumulated water 12, is directed from the central portion of the compressed air chamber 4 toward the partition wall 21.

  An air introduction part 17 is provided at the tip of the pipe 16 connected to the air compressor 15 on the carriage 37 and approaches the water introduction part 13 at the center of the floor slab 7 of the compressed air chamber 4. Thus, an ejection hole 18 of the air introduction part 17 is formed.

  As a result, the high-pressure compressed air 3 supplied from the ejection hole 18 of the air introduction part 17 becomes a bubble B and rises in the accumulated water 12 from the position directly above by the buoyancy, but the water introduction part 13 Since the screw member 40 is rotating at the upper part of the air bubble, the bubbles B of the compressed air 3 are entangled with the blades 44 of the screw member 40. Therefore, the high-pressure compressed air 3 supplied from the air introduction portion 17 is moved toward the partition wall 21 along with the movement at the contact interface S generated by the rotational movement of the screw member 40, and passes through the partition wall 21. It is discharged from the discharge unit 20.

  In the example shown in FIG. 10, turbulent flow is generated in the contact interface S by the stirring operation of stirring the contact interface S by the blades 44 of the screw member 40, and the high-pressure compressed air 3 can be mixed with the staying water 12. As a result, the penetration of oxygen is promoted, and the water quality improving effect is further enhanced. Moreover, since the water quality improvement tank 5 is suspended from the carriage 37, there exists an advantage which can move an installation place easily.

In the example shown in FIG. 10, the water quality improvement tank 5 forming the compressed air chamber 4 is suspended from the carriage 37 and installed on the bottom layer 2 of the closed water area 1, but the installation location is determined in advance. If this is the case, a pedestal may be provided on the bottom 9 without using the carriage 37 and installed on the pedestal.
[Sixth Embodiment of the Invention]

  FIG. 11: is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 6 of this invention. FIG. 12 is a plan view thereof.

  The compressed air chamber 4 is formed by a three-dimensional cover body 45 having an open bottom surface and a water bottom 9 of the closed water area 1, and a contact portion between the opening edge 46 of the cover body 45 and the water bottom 9 of the closed water area 1 is discharged. The compressed air 3 can be discharged as 20.

  In the example shown in FIG. 11, the cover body 45 has a tensile strength that can withstand the pressure of the high-pressure compressed air 3, and can be kept airtight with, for example, laminated film rubber, resin, or a thin steel plate. It is made of an airtight membrane that exhibits a shape. A weight 47 capable of resisting buoyancy is provided at the opening edge 46 around the cover body 45 or is fixed to the water bottom 9 using an anchor material (shown). A partition wall 21 is provided below the opening edge 46, and serrated irregularities are formed at the lower end portion when viewed from the front. A part of the partition wall 21 and the serrated irregularities are embedded in the water bottom 9.

  In the vicinity of the opening edge 46 of the cover body 45, an air introduction part 17 for sending the high-pressure compressed air 3 into the compressed air chamber 4 is attached, and the air introduction part 17 ejects the compressed air 3. A hole 18 is formed.

  In the example shown in FIG. 11, when the high-pressure compressed air 3 is fed into the compressed air chamber 4 through the air introduction part 17, the cover body 45 is initially enclosed in the water bottom 9 and is enclosed in the compressed air chamber 4. The staying water 12 is discharged to the staying water 12 outside the cover body 45 from the serrated irregularities of the partition wall 21 so as to be pushed out by the compressed air 3. When the high-pressure compressed air 3 is continuously fed into the compressed air chamber 4, a part of the partition wall 21 and the serrated irregularities at the lower end thereof are embedded in the water bottom 9, so that the surface layer of the water bottom 9 When the compressed air 3 enters the area, the contact interface S is lowered from the original water bottom 9, and a tidal flat is formed on the water bottom 9 in the compressed air chamber 4.

  As a result, the compressed air 3 enters the water bottom 9 and oxygen is supplied, so that oxygen is filled between the soil particles under the water bottom, so that the oxidation with the organic substance remaining between the soil particles is promoted. Therefore, activation of the water bottom 9 in the compressed air chamber 4 can also be performed.

It is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 1 of this invention. It is AA sectional drawing of the water quality improvement apparatus which concerns on the same Embodiment 1 of FIG. It is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 2 of this invention. It is BB sectional drawing of FIG. 3 of the water quality improvement apparatus which concerns on the same Embodiment 2. FIG. It is the front view made into the partial cross section of another aspect of the water quality improvement apparatus which concerns on Embodiment 2 of this invention. It is CC sectional drawing of FIG. 5 of another aspect of the water quality improvement apparatus which concerns on the same Embodiment 2. FIG. It is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 3 of this invention. It is DD sectional drawing of FIG. 7 of the water quality improvement apparatus which concerns on the same Embodiment 3. FIG. It is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 4 of this invention. It is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 5 of this invention. It is the front view made into the partial cross section of the water quality improvement apparatus which concerns on Embodiment 6 of this invention. It is a top view of the water quality improvement apparatus concerning Embodiment 6. It is a conceptual diagram of the conventional small-scale water quality improvement apparatus. It is a conceptual diagram of the conventional large-scale water quality improvement apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Closed water area 2 Bottom layer part 3 Compressed air 4 Compressed air chamber 5 Water quality improvement tank 6 Top plate 7 Floor slab 8 Side wall 9 Water bottom 10 Foundation part 12 Stagnant water 13 Water introduction part 15 Air compressor 16 Piping 17 Air introduction part 18 Ejection hole 20 Discharge Part 21 Partition Wall 22 Communication Port 26 Bulkhead 27 Connecting Member 37 Carrier 45 Cover Member 46 Opening Edge

Claims (8)

A compressed air chamber having a space capable of storing stagnant water and high-pressure compressed air in the bottom layer of the closed water area, an air introducing portion for sending compressed air into the compressed air chamber, and compressed air in the compressed air chamber. A water quality improvement device having a discharge portion for discharging, wherein the compressed air sent from the air introduction portion to the compressed air chamber becomes bubbles from the discharge portion and rises in the water surface direction of the closed water area Accordingly, the water quality improving apparatus is characterized in that the stagnant water in the compressed air chamber is discharged from the discharge portion. A compressed air chamber having a space capable of storing stagnant water and high-pressure compressed air in the bottom layer of the closed water area, an air introducing portion for sending compressed air into the compressed air chamber, and compressed air in the compressed air chamber. A water quality improvement device having a discharge portion for discharging, wherein the compressed air chamber is formed of a three-dimensional cover body having an open bottom surface and a water bottom of the closed water area, and an opening edge of the cover body; The water quality improvement device characterized in that the compressed air can be discharged by using a contact portion with the bottom of the closed water area as the discharge portion. The compressed air chamber has a water introducing portion for introducing the accumulated water in the bottom layer portion, and continuously retains the remaining water outside the compressed air chamber with the flow of the compressed air. The water quality improvement device according to claim 1, wherein the water quality improvement device is introduced from the discharge portion and discharged from the discharge portion. A partition wall that extends downward from the ceiling of the compressed air chamber is provided between the water introduction portion and the discharge portion, and contacts the separated water and the compressed air by a balance between water pressure and air pressure. The water quality improving apparatus according to claim 3, wherein an interface is formed. At least one partition wall is provided between the water introduction part and the partition wall, so that the water level in the partition partitioned by the partition wall and the partition wall or the partition wall and the partition wall becomes higher as it is closer to the discharge part. The water quality improving apparatus according to claim 4, wherein a height of the partition wall is set. 6. The water quality improvement apparatus according to claim 4, wherein a plurality of the compressed air chambers are arranged above and below, and the lower compressed air chamber and the upper compressed air chamber communicate with each other through a connecting portion. The compressed air chambers are arranged in parallel, each of the compressed air chambers has the water introduction portion at one end, and the other end of each compressed air chamber is integrated with a connecting member having the discharge port. The water quality improvement apparatus according to claim 4 or 5, wherein the water quality improvement apparatus is provided. The water introduction part and the air introduction part are provided in the central part of the bottom surface of the compressed air chamber, the discharge part is provided in the outer peripheral part of the compressed air chamber, and a stirring device capable of stirring the contact interface is provided. The water quality improvement apparatus according to claim 4 or 5, characterized in that.

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