JP5595777B2 - Foam separator - Google Patents

Description

  The present invention relates to a foam separation apparatus that is optimal for purifying the breeding water of aquatic organisms such as live fish in experimental facilities, farms, and aquariums, for example.

  About.

  Conventionally, aquatic organisms are bred in a closed space such as an aquarium because minute amounts of fine suspensions (leftover food, waste products of aquatic organisms) are constantly released in large quantities. Therefore, a water purification treatment system for keeping the breeding water clean is indispensable.

  Such a water purification treatment system adsorbs fine pollutants to bubbles generated by flowing fine air into the breeding water, and separates and removes the floating bubbles that have risen. Then, after the breeding water is treated, the filtered treated water is returned to the water tank.

  A foam separation apparatus is employed as an aeration treatment apparatus for separating and removing the floating bubbles. Such a foam separation device includes a foam separation tank to which gas-liquid mixed water containing bubbles is supplied. The top wall of the foam separation tank is formed into a spherical surface in a funnel shape that is convex upward, and a discharge port portion is provided at the center thereof. And the foam which adsorb | sucked and suspended the suspended solid is discharged | emitted from this discharge port part out of a foam separation tank (for example, refer patent document 1).

JP 2009-136739 A

  However, the foam separating apparatus described in Patent Document 1 has a configuration in which the top wall is formed into a spherical surface in a funnel shape that is convex upward, and a discharge port portion is provided at the center thereof. Thus, there is a problem that the processing cost (manufacturing cost) becomes high in order to form the top wall in a funnel shape. Moreover, since the foam which adsorb | sucked the suspension material floats one by one in a foam separator, how to discharge a foam from a separation tank is an important subject also in order to improve processing capacity.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a foam separation device that achieves a reduction in manufacturing cost and increases the efficiency of foam discharge.

The present invention has been made to solve the above problems, and is a foam separation device for separating a suspension contained in raw water in a water tank, and is supplied with gas-liquid mixed water containing bubbles. A foam separation tank is provided, and the foam separation tank includes a cylindrical separation tank main body and a flat top wall that closes the upper surface opening of the separation tank main body, and adsorbs the suspension in the separation tank main body. and outlet portion for discharging the floated foam and is one the provided diameter direction of the upper in and the separation tank body of the separation tank body, the top wall lower surface, the foam is along the top wall lower surface The separation surface is formed such that an inclined surface rising from the other diameter direction of the separation tank body toward one side is formed so as to flow toward the discharge port portion, and the lower surface of the top wall and the upper surface of the separation tank body are in contact with each other The other lowest position of the tank body is set lower than the discharge port portion. There.

  In the present invention, since the lower surface of the top wall of the foam separation tank is formed as an inclined surface that rises toward the other side of the foam separation tank, the spherical surface is formed in a funnel shape that is convex upward unlike the conventional case. This is not necessary and the manufacturing cost is low. Moreover, since the foam which floated by adsorbing the suspension in the foam separation tank flows in the discharge direction along the lower surface of the top wall, the foam which is about to stay can be discharged smoothly.

  In the foam separation device, the top wall is made of a flat plate material. In such a case, the top wall can be manufactured easily because a flat plate material is processed.

  In the present invention, the lower surface of the top wall of the foam separation tank is formed on an inclined surface that rises from the other side of the foam separation tank to one side. Therefore, the manufacturing cost can be reduced. In addition, since the foam that floats by adsorbing the suspended matter in the foam separation tank flows in the discharge direction along the lower surface of the top wall, the foam can be discharged smoothly and the foam can be discharged more efficiently. Can be planned.

It is the schematic of the water purification processing system provided with the foam separation apparatus of one embodiment of this invention. It is a front view containing the partial cross section of the foam separation apparatus. It is a side view of the foam separation apparatus. It is a rear view of the foam separation apparatus. It is a top view of the foam separation apparatus. It is a side view containing the partial cross section of the foam separation apparatus. It is sectional drawing which shows the upper part of the foam separation apparatus. It is sectional drawing of the same gas-liquid separation tank. It is sectional drawing of the state which showed the water level adjustment means of the same gas-liquid separation tank, and raised the water level adjustment member. It is a perspective view which shows the principal part of the water level adjustment means.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 10 show an embodiment of the present invention.

  FIG. 1 is a schematic view of a water purification treatment system provided with a foam separation device according to the present embodiment. In the figure, a water purification treatment system 1 according to the present embodiment includes a water tank 2 in which live fish such as saury and flounder are raised as aquatic organisms, and raw water 9 that is treated water from this water tank 2 is a raw water supply pipe. 7, the auxiliary water tank 3 that stores a predetermined amount, the foam separation device 10 that foam-separates the raw water 9 that is pumped from the auxiliary water tank 3 by the circulation pump 6, and the treated water 66 that is treated by the foam separation device 10. And a filtering device 5 for filtering the water.

  The water tank 2 and the auxiliary water tank 3 are set to substantially the same height, and the foam separation device 10 and the filtration device 5 are installed at a higher position than the water tank 2 and the auxiliary water tank 3. Moreover, the foam separation device 10 is installed at a higher position than the filtration device 5.

  As shown in FIGS. 2 to 6, the foam separation device 10 separates the raw water 9 into treated water 66 and dirty foam water 67 by aeration treatment, and the raw water 9 from the auxiliary water tank 3 is supplied to the circulation pump 6. The foam separation tank 20 fed under pressure, the gas-liquid separation tank 30 disposed downstream of the foam separation tank 20 (downstream of the treated water 66), the foam separation tank 20 and the gas-liquid separation tank 30 are erected. A gantry 40 is provided.

  The foam separation tank 20 includes a cylindrical separation tank main body 21, a ceiling wall 22 that closes an upper surface opening of the separation tank main body 21, and a cylindrical initial reaction cylinder 23 built in the separation tank main body 21. Has been.

  An air self-priming injector (fine bubble generator) 26 having a venturi tube (not shown) is connected to the lower surface of the initial reaction cylinder 23 via a pipe 24. The fine bubble generator 26 and the circulation pump 6 are connected by a raw water supply pipe 8. Reference numeral 25 denotes an air suction pipe connected immediately after the throttle portion of the venturi pipe.

  As shown in FIG. 2, a small-diameter drainage opening 23 a that communicates the inside of the initial reaction cylinder 23 and the inside of the separation tank main body 21 is formed at the lower part of the initial reaction cylinder 23.

  The upper surface of the separation tank main body 21 is inclined so as to become lower toward the gas-liquid separation tank 30 side. In addition, on the opposite side of the separation tank body 21 from the gas-liquid separation tank 30 (on the upper part of the separation tank body 21 and in one of the diametrical directions), an outlet port 27 having an outlet opening 27 a communicating with the inside and outside of the separation tank body 21. The foam outlet 28 is connected to the outlet 27.

  The top wall 22 has a simple structure in which a downward annular rib 22b is provided on the periphery of a disk-shaped top wall main body 22a. Thus, the top wall 22 is formed by processing a flat plate material into the top wall main body 22a and the annular rib 22b and does not need to be formed into a curved surface. Therefore, the processing is easy and the manufacturing cost is low. Since the ceiling wall 22 is fixed to the inclined upper surface of the separation tank main body 21, the ceiling wall 22 is also inclined with an inclination angle α like the upper surface of the separation tank main body 21. That is, an inclined surface 22b that is flat and has an inclination angle α is formed on the lower surface of the top wall body 22a.

  As shown in FIG. 7, the height position on the lower side of the top wall 22 (the lowest position P <b> 1 in contact with the bottom surface of the top wall 22 and the top surface of the separation tank main body 21) is higher than the outlet opening 27 a of the discharge port portion 27. It is set low. That is, the outlet opening 27a of the discharge port portion 27 is located on the highest side where the lower surface of the top wall 22 and the upper surface of the separation tank main body 21 are in contact, and the height position P1 on the lower side of the top wall 22 and the higher side. And a height position P2.

  The gas-liquid separation tank 30 is configured as a double cylinder from a cylindrical outer cylinder 31 and an inner cylinder 32 built in the outer cylinder 31. Thus, it can be made compact by comprising the gas-liquid separation tank 30 in a double cylinder shape.

  The height of the inner cylinder 32 is set to be shorter than the height of the outer cylinder 31 by a predetermined distance. Between the upper and lower sides of the inner cylinder 32 and the outer cylinder 31, as shown in FIG. L is provided. As shown in FIG. 2, a small-diameter drainage opening 32 a that communicates the inside of the inner cylinder 32 and the inside of the outer cylinder 31 is formed in the lower portion of the inner cylinder 32.

  As shown in FIGS. 8 to 10, the gas-liquid separation tank 30 is provided with a water level adjusting means 50 at the top thereof. The water level adjusting means 50 has a cylindrical water level adjusting member 51 whose upper and lower surfaces are open and can be moved up and down from the upper side to the inner cylinder 32 so as to be rotatable, and an elevating means 52 for raising and lowering the water level adjusting member 51 It has.

  A plate-like attachment member 53 is fixed to the upper surface of the water level adjustment member 51 by welding or the like. Further, two U-shaped slits 54 whose upper surfaces are open are formed in the upper peripheral wall of the water level adjusting member 51 in the diameter direction of the water level adjusting member 51. The slit 54 serves as a treated water inlet.

  The elevating means 52 includes a bolt 55 as a connecting member whose lower part is inserted into the mounting member 53, and a wing nut 56 as a rotating member fixed to the upper part of the bolt 55. And the lower part of the volt | bolt 55 is fastened and fixed to the attachment member 53 by the nuts 57 and 57 located in the attachment member 53 upper and lower surfaces. When the lower portion of the bolt 55 is fastened and fixed to the mounting member 53, the nuts 57 and 57 can be easily rotated by a tool using the slit 54.

  A cylindrical drain socket 60 having a top wall 61 is fitted on the outer cylinder 31 from above the outer cylinder 31. A female screw portion 61b is formed at the center of the top wall 61, and the bolt 55 is inserted into and screwed into the female screw portion 61b. Moreover, the bolt 55 is screwed into a lock nut 63 located on the upper surface side of the top wall 61. The female thread portion 61b may be formed by processing the top wall 61. However, a hole through which the bolt 55 is inserted is provided in the top wall 61, and a nut to which the bolt 55 is screwed is fixed to the top wall 61. May be.

  By loosening the lock nut 63 and rotating the wing nut 56, the bolt 55 rotates together with the wing nut 56 and moves forward and backward (up and down) with respect to the top wall 61. As a result, the water level adjusting member 51 also rotates integrally with the bolt 55, and the water level adjusting member 51 can be adjusted up and down with respect to the inner cylinder 32.

  The lower part of the outer cylinder 31 of the gas-liquid separation tank 30 and the lower part of the separation tank body 21 of the foam separation tank 20 are communicated with each other via a communication path 41. Accordingly, the treated water 66 separated in the foam separation tank 20 flows into the gas-liquid separation tank 30 via the communication path 41.

  Further, a separation water recovery pipe 44 is connected to the lower surface of the inner cylinder 32, and treated water 66 is supplied to the filtration device 5 through the separation water recovery pipe 44. Further, a water distribution pipe 43 that can be closed is branched from the separated water recovery pipe 44.

  As shown in FIGS. 1 and 6, the outer cylinder 31 is provided with a separation / recovery connection port 33. The separation / recovery connection port 33 receives treated water 66 in the outer cylinder 31 from the auxiliary water tank 3. A separation / recovery bypass pipe 35 is connected to the back.

  The filtration device 5 employs a known filtration means and includes, for example, a filtration tank filled with porous coral sand or the like. The treated water 66 filtered by the filtration device 5 is returned to the water tank 2 through the circulation line 45.

  Next, the case where the water purification processing system 1 of this embodiment which consists of the above structure is used is demonstrated.

  First, when the circulation pump 6 is activated, the circulation pump 6 pumps the raw water 9 in the auxiliary water tank 3 to the foam separation tank 20 via the raw water supply pipe 8. That is, the raw water 9 pumped by the circulation pump 6 is generated as gas-liquid mixed water mixed with a large amount of bubbles when passing through the fine bubble generating device 26 provided with a venturi pipe. Then, gas-liquid mixed water is supplied from the bottom of the initial reaction cylinder 23.

  The gas-liquid mixed water that floats from the initial reaction cylinder 23 becomes a foam 65, and the foam 65 rises while adsorbing a suspension suspended in the separation tank body 21 (see FIG. 2). The rising foam 65 comes into contact with the lower surface of the top wall 22, and the foam 65 at the top of the separation tank body 21 is pushed from below by the foam 65 that sequentially rises from below. Since the lower surface of the top wall 22 is an inclined surface 22b, the lower surface of the top wall 22 exhibits the function of a guide surface and forcibly guides the foam 65 toward the discharge port portion 27 in the discharge direction.

  Furthermore, the foam 65 moves along the lower surface of the top wall 22, is discharged out of the foam separation tank 20 together with the suspended matter adsorbed from the outlet opening 27 a, and is removed as dirty water 67 containing the suspended matter. .

  On the other hand, the treated water 66 separated from the dirty water 67 flows from the separation tank body 21 into the outer cylinder 31 of the gas-liquid separation tank 30 through the communication passage 41 below the separation tank body 21.

  The treated water 66 that has entered the lower portion of the outer cylinder 31 flows upward between the inner and outer cylinders 31 and 32 and reaches the water level adjusting means 50. The treated water 66 that has reached the water level adjusting means 50 enters the inner cylinder 32 through the slit 54 of the water level adjusting member 51 that adjusts the water level. Even if air is mixed in the treated water 66 as bubbles, the treated water 66 that has flowed upward between the inner and outer cylinders 31 and 32 flows downward when passing through the slit 54. At this time, the air is separated from the treated water 66 and discharged. In addition, when discharging | emitting air, it can carry out suitably through the air vent part 61a formed in the top wall 61. FIG.

  Note that the water level of the treated water 66 in the separation tank main body 21 is adjusted in advance by the water level adjusting means 50, so that the dirty water 67 is removed from the separation tank main body 21 and the treated water 66 flows into the outer cylinder 31. Are adjusted in a well-balanced manner. Specifically, in order to reduce the excessive outflow of the dirty water 67, the water level adjusting member 51 may be lowered to lower the water level in the separation tank main body 21. By lowering the water level in this way, it is possible to prevent the treated water 66 from flowing out of the foam discharge pipe 28 together with the dirty foam water 67.

  Furthermore, after the treated water 66 flows downward in the inner cylinder 32, the treated water 66 is sent to the filtering device 5 through the separated water recovery pipe 44, and is filtered by the filtering device 5 and passes through a UV sterilizer (not shown). After that, it is returned to the water tank 2 via the circulation line 45.

  A part of the treated water 66 in the gas-liquid separation tank 30 is returned to the auxiliary water tank 3 through the separation / recovery bypass pipe 35. In this way, a part of the treated water 66 that comes out of the gas-liquid separation tank 30 is returned to the auxiliary water tank 3, and the foam separation device 10 again performs the foam separation process as described above. Is more certain. The treated water 66 supplied from the gas-liquid separation tank 30 to the filtration device 5 and the treated water 66 returned to the auxiliary water tank 3 are preferably set to substantially the same amount.

  Moreover, since the foam separation apparatus 10, the filtration apparatus 5, the water tank 2, and the auxiliary water tank 3 are sequentially lowered and provided with a height difference, the water level of the foam separation apparatus 10, the water level of the filtration apparatus 5, the water tank 2 The water level of the water tank and the water level of the auxiliary water tank 3 are gradually lowered. Therefore, the treated water 66 that has exited the foam separation device 10 can be caused to flow into each by being naturally dropped by gravity. As a result, when the raw water 9 in the water tank 2 is circulated and processed, the single circulation pump 6 can be sufficiently used, and the number of the circulation pumps 6 can be reduced.

  When draining the treated water 66 in the foam separator 10, the water distribution pipe 43 is opened. By opening the water distribution pipe 43, the treated water 66 in the initial reaction cylinder 23 flows into the separation tank main body 21 through the drain opening 23 a at the lower part of the initial reaction cylinder 23. The treated water 66 in the separation tank main body 21 enters the outer cylinder 31 of the gas-liquid separation tank 30 through the connection pipe 41. Further, the treated water 66 in the inner cylinder 32 enters the outer cylinder 31 through the discharge opening 32 a of the inner cylinder 32. Finally, the treated water 66 in the outer cylinder 31 is discharged through the water distribution pipe 43.

  The present invention is not limited to the embodiment described above. The inclination angle α of the top wall 22 can be appropriately set depending on the amount of the foam 65. The ceiling wall 22 can also be constituted only by the ceiling wall body 22a made of a flat plate material.

  Further, the water level adjusting means 50 may be configured to move the water level adjusting member 51 up and down by a motor or a cylinder mechanism.

DESCRIPTION OF SYMBOLS 1 Water purification processing system 2 Water tank 3 Auxiliary water tank 5 Filtration apparatus 6 Circulating pump 9 Raw water 10 Foam separation apparatus 20 Foam separation tank 21 Separation tank main body 22 Top wall 22b Inclined surface 25 Air suction pipe 26 Injector (fine bubble generator)
27 Discharge port 28 Foam discharge pipe 30 Gas-liquid separation tank 50 Water level adjusting means 65 Foam 66 Treated water 67 Dirty water

Claims (1)

A foam separation device for separating a suspension contained in raw water in a water tank,
A foam separation tank to which gas-liquid mixed water containing bubbles is supplied,
The foam separation tank comprises a cylindrical separation tank body and a flat top wall that closes the upper surface opening of the separation tank body,
The outlet portion for discharging the foam that floats by adsorbing suspension separation tank body is provided on one of the radial direction of and the separation tank body at the upper portion of the separation tank body,
The lower surface of the ceiling wall is formed with an inclined surface that rises from the other of the diameter directions of the separation tank body toward one side so that foam flows along the lower surface of the ceiling wall toward the discharge port .
The foam separation device , wherein the other lowest position of the separation tank main body where the top wall lower surface and the upper surface of the separation tank main body contact each other is set lower than the discharge port portion .

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