JP5706366B2 - Septic tank - Google Patents

Description

  The present invention relates to a septic tank for treating sewage, and more particularly, to a septic tank in which maintenance of an air diffuser is easy.

  As shown in FIGS. 9 and 11, some septic tanks 100 for treating sewage have a carrier flow tank 106 in which a plurality of T-shaped air diffusers 101 are arranged. The carrier flow tank 106 is an aerobic treatment tank in which an aeration process is performed, and the carrier flows in the tank by the air ejected from the air diffuser 101. The air diffuser 101 is connected to an air diffuser tube 102 in which two porous tubes 102a each having a large number of fine holes for ejecting air are connected, and to the air diffuser tube 102 connected to the center of the air diffuser tube 102. And an air supply pipe 103 for supplying air. Since the air diffuser 102 may be clogged, the air diffuser 101 needs to be pulled out of the tank for maintenance such as cleaning and replacement. For this reason, conventionally, in the septic tank 100, the opening 104 is provided above the arrangement position of the air diffuser 101.

  Such a T-shaped air diffuser 101 is difficult to incline because the air supply pipe 103 abuts against the opening 104 when it is largely inclined. For this reason, in the conventional septic tank 100, the opening 104 has a length close to the length of the diffuser tube 102, such as a rectangular shape of 1000 mm × 600 mm if the length of the diffuser tube 102 is 1130 mm, for example. As a rectangular shape having a rectangular rectangular lid, when closing the air diffuser 101, remove the square lid, remove the air supply pipe 103 from the air pipe 105 that supplies air to the air supply pipe 103, As shown in FIG. 10, the air diffuser 101 is rotated so that the longitudinal direction of the air diffuser 102 is along the long side direction of the opening 104, and the air diffuser 101 is slightly tilted as shown in FIG. Thus, the air diffuser 102 passes through the opening 104. In addition, when the size of the opening 104 is small and it is difficult to incline the air diffuser 101 and pass the air diffuser 102, the air supply tube 103 is pulled up so that the air diffuser 102 approaches the opening 104. Then, the screw at the connecting portion between the air supply pipe 103 and the diffuser pipe 102 is loosened in the tank, and the diffuser pipe 102 is taken out.

  In addition, the septic tank which made it easy to take out the diffuser pipe out of the tank so that it can be switched between the first attitude in which the diffuser pipe can be inserted through the diffuser pipe insertion hole and the second attitude when installed in the aerobic treatment tank. Is described in Patent Document 1 below.

JP 2001-9484 A

  However, in the conventional septic tank 100, when a large square lid having a length close to the length of the air diffusing tube 102 is configured with one sheet, there is a problem that workability is poor because the weight increases. In the case of a plurality of divided lids, a beam for receiving the divided lids must be passed to the opening 104, and when removing the diffuser 101, the beams must also be removed. Therefore, there was a problem that workability was poor. In addition, the large square lid has a problem that the manufacturing cost is high. Furthermore, when the screw at the connection portion between the air supply pipe 103 and the diffuser tube 102 is loosened in the tank and the diffuser pipe 102 is taken out, both the air supply pipe 103 and the diffuser pipe 102 should not fall into the tank. Since the screw has to be loosened while being supported by a person, it is difficult for one person to work and the workability is poor, and there is a possibility that the diffuser tube 102 may be removed.

  Moreover, in the septic tank described in the said patent document 1, since the diffuser tube was comprised so that switching to a 1st attitude | position and a 2nd attitude | position was possible, there existed a problem that the structure of an diffuser tube became complicated and manufacturing cost became high.

  The present invention solves the above-mentioned problems, and provides a septic tank that can improve the workability when taking out the air diffuser and can reduce the possibility of removing the air diffuser and can be manufactured at low cost. With the goal.

  The septic tank of the present invention comprises an aerobic treatment tank, an air diffuser that is disposed in the aerobic treatment tank and supplies air to the aerobic treatment tank, and an air tube that supplies air to the air diffuser. A septic tank, wherein the aeration device is detachably connected to the aeration tube disposed below the water surface during normal operation of the aerobic treatment tank, and attached to and detached from the air tube. An air supply pipe that is connected to the air diffusion pipe and that is arranged substantially along the vertical direction, and sends the air supplied from the air pipe to the air diffusion pipe, and a connection portion between the air supply pipe and the air pipe. Is disposed above the water surface, and an opening is formed above the coupling portion so as to be openable and closable by a lid, and the air diffuser is disposed below the opening and above the water surface. It is characterized by having a bronchial support part that is detachably supported

  According to this, an opening is formed above the connecting portion between the air supply pipe and the air pipe, and below the opening and above the water surface during normal operation of the aerobic treatment tank, the diffuser pipe The air diffuser holding part that detachably supports is provided, so when removing the air diffuser, the connection between the air supply pipe and the air pipe is released from the opening, and the air supply pipe is lifted upward. The air supply pipe and the air diffuser are disconnected by supporting the air diffuser holding part, the air diffuser is grasped by hand and removed from the air bronchus holding part, and the air diffuser is inclined so as to pass through the opening. Can be taken out. Thus, since the connection with the air supply pipe can be released in a state where the air diffusing pipe is supported by the air diffusing bronchus holding part, it is easy for one person to work, the workability is improved, and the possibility of dropping the air diffusing pipe is reduced. In addition, it is only necessary to incline the diffuser pipe after passing the connection with the air supply pipe and pass the opening, so there is no need to enlarge the opening and the lid can be made smaller, thus reducing the weight of the lid. Therefore, workability when opening and closing the lid is improved, and the manufacturing cost of the lid can be reduced. And since it is not necessary to make an air diffuser into a complicated structure, the manufacturing cost of an air diffuser does not rise. Therefore, a septic tank can be manufactured at low cost.

  Here, it is preferable that the opening surface of the opening is circular.

  According to this, since the inexpensive manhole cover can be diverted as the cover for closing the opening, the septic tank can be manufactured at a lower cost.

  The bronchial holding part has a tubular shape in which an opening is formed from one end to the other end along the longitudinal direction so as to form a C-shaped cross section, and the longitudinal direction is normally operated in the aerobic treatment tank. It is arranged along the longitudinal direction of the air diffusing tube when it is sometimes arranged, and the opening of the diffusing bronchi holding part is an opening connecting corresponding ends along the circumferential direction of the diffusing bronchi holding part The width may be formed such that the diffuser tube can be inserted, and may be disposed so as to open upward or obliquely upward.

  According to this, the air supply pipe is grasped and the air diffuser is lifted upward, and the air diffuser is inserted into the air bronchus holding part from the opening of the air bronchus holding part and supported without changing the direction of the air diffuser. Therefore, the work for supporting the air diffusing tube on the bronchus holding part is easy, and the workability can be further improved. Moreover, since the configuration of the bronchial holding part is simple, an increase in the manufacturing cost of the septic tank can be suppressed.

  According to the septic tank of the present invention, it is possible to improve the workability when taking out the air diffusing tube, reduce the possibility of removing the air diffusing tube, and manufacture at a low cost.

It is a schematic cross-sectional view of one embodiment of the septic tank of the present invention. It is a schematic longitudinal cross-sectional view of the same embodiment. It is a principal part longitudinal cross-sectional view of the same embodiment. It is a top view of the dilated bronchial holding part and attachment member of the embodiment. It is a principal part perspective view of the embodiment. It is a principal part top view for description when taking out the diffuser of the embodiment. It is a principal part perspective view for description when taking out the diffuser of the embodiment. It is explanatory drawing when taking out the diffuser of the embodiment. It is a schematic cross-sectional view of a conventional septic tank. It is a principal part top view for description when taking out the conventional diffuser. It is explanatory drawing when taking out the conventional diffuser.

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

  As shown in FIGS. 1 and 2, the septic tank C of the embodiment is configured by dividing the inside of a substantially rectangular parallelepiped tank 1 by a plurality of partition walls. Openings 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i serving as inspection ports are formed, and the openings 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2i are covered with the lid 3a. 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i. The openings 2a, 2c, 2e, 2f, and 2g have circular openings, and the lids 3a, 3c, 3e, 3f, and 3g are manhole covers having a circular shape with a diameter of about 600 mm. ing. On the other hand, the opening portions 2b, 2d, 2h, and 2i have a rectangular opening surface, and the lids 3b, 3d, 3h, and 3i are rectangular rectangular lids.

  In the embodiment, unless otherwise specified, the vertical direction, the horizontal direction, the front-rear direction, the height direction of the tank 1 in a state embedded in the ground is the vertical direction, and the upstream side in the drainage inflow direction is the left side. The description will be made assuming that the longitudinal direction of 1 is the left-right direction and the short direction of the tank 1 is the front-rear direction.

  In the tank 1, in order from the upstream side, an aeration type screen tank 11, a flow rate adjustment tank 12, a sludge concentration storage tank 13, a perforated screen tank 14, a carrier flow tank 15, a biological filtration tank 16, a disinfection tank 17, and A discharge pump tank 18 is arranged.

  In the aeration type screen tank 11, a bar screen 21 formed in a comb shape and an air diffuser 22 for ejecting air into the tank are arranged. In the sewage flowing into the aeration type screen tank 11 from the inflow pipe 23, coarse solids are removed by the bar screen 21, and the sewage is transferred to the flow rate adjusting tank 12 from a transfer port (not shown).

  The flow rate adjustment tank 12 is provided with a fixed amount transfer device 25 having a pump 24 and an aeration device 26. The fixed amount transfer device 25 measures the sewage in the flow rate adjustment tank 12, and perforates a predetermined amount. It is transferred to the tank 14 via a transfer pipe 27.

  The perforated screen tank 14 is provided with an air diffuser 29 and an air lift pump 30, and communicates with the carrier fluid tank 15 through a porous screen plate 28, and the perforated screen tank 14 and the carrier fluid tank 15. The sewage is configured to flow back and forth through the screen plate 28, and the residue in the sewage having a certain size or larger is captured by the screen plate 28. The trapped residue is peeled off from the screen plate 28 by the contact of the carrier in the carrier flow tank 15 and the bubbles generated from the air diffuser 29 in the porous screen tank 14. The air lift pump 30 sucks the sludge and residue remaining in the perforated screen tank 14 and transfers them to the sludge concentration storage tank 13.

  The sludge concentration storage tank 13 is a tank for storing sludge in the lower part of the tank, a convection pipe 31 for transferring the sewage in the upper part of the tank to the flow rate adjustment tank 12 and an aeration device 32 are arranged. .

  The carrier fluid tank 15 is an aerobic treatment tank, and a large number of unillustrated carriers made of synthetic resin for attaching aerobic microorganisms are accommodated therein, and a plurality of aeration devices 4 are disposed in the tank. The aeration is performed by the air ejected from each air diffuser 4 and the carrier is caused to flow. The sewage treated in the carrier fluid tank 15 is transferred to the biological filtration tank 16 from the advection port 33 provided on the partition wall with the biological filtration tank 16.

  The biological filtration tank 16 precipitates sludge in the sewage flowing from the carrier fluidized tank 5 and filters it with a filter medium. The biological filtration tank 16 includes a filter medium 34 disposed at the upper part of the biological filtration tank 6 and sludge is sludged by an air lift pump. A transfer pipe 35 for transferring to the concentration storage tank 13 and the flow rate adjustment tank 12 is provided. The sewage treated in the biological filtration tank 16 is transferred to the disinfection tank 17 from the transfer port 36 provided on the partition wall with the disinfection tank 17.

  The disinfection tank 17 disinfects the sewage flowing from the biological filtration tank 16, and the sterilized water disinfected in the disinfection tank 17 is discharged through an overflow wall 37 provided on a partition wall with the discharge pump tank 18. It flows into the pump tank 18.

  The discharge pump tank 18 is provided adjacent to the sterilization tank 17 in the front-rear direction, and includes a pump 38 to discharge the sterilized water flowing from the sterilization tank 17 through the discharge pipe 39.

  Next, the principal part of the septic tank C will be described.

  Each air diffuser 4 disposed in the carrier fluid tank 15 includes an air diffuser 41 and an air diffuser 41 disposed below the water surface W during normal operation of the carrier fluid tank 15 and substantially along the left-right direction of the septic tank C. And an air supply pipe 42 which is detachably connected to be disposed substantially along the vertical direction, and has a substantially T-shape as a whole.

  Specifically, three air diffusers 4 are disposed in the carrier flow tank 15, and the air diffuser 41 of the central air diffuser 4 includes two porous tubes 41a each having a length of about 500 mm and a connecting member. By connecting with 41c, it forms a rod shape as a whole, and the diffuser tube 41 of the right and left diffuser 4 is connected to the tubular body 41a and the porous tubular body 41b having a length of about 250 mm by the connecting member 41c. Therefore, it has a rod shape as a whole. A cap 41d is fitted to the end of the tubes 41a and 41b opposite to the connecting member 41c (see FIG. 7). In any of the air diffusers 4, the air supply pipe 42 is connected to the connecting member 41c by screwing its end into a female screw portion 41e formed on the connecting member 41c.

  As shown in FIG. 3, the air supply pipe 42 is detachably connected to the branch pipe 51 of the air pipe 5 disposed in the septic tank C at the upper end portion via a screw-type connection member 61. The air supplied from the pipe 5 is sent to the diffuser pipe 41. Note that a blower (not shown) is connected to the air pipe 5 to send air. The branch pipe 51 rises from a connecting portion 52 provided in the air pipe 5. The connecting portion 6 between the air supply pipe 42 and the air pipe 5 by the connecting member 61 is disposed above the water surface W during normal operation of the carrier flow tank 15 and is disposed below the openings 2e, 2f, and 2g. ing. In other words, the openings 2e, 2f, and 2g are formed above the connecting portion 6 between the air supply pipe 42 and the air pipe 5.

  In addition, below the openings 2e, 2f, and 2g and above the water surface W, a dilatation holding portion 7 that removably supports the aeration tube 41 is provided.

  Specifically, as shown in FIGS. 3 to 5, the bronchial holding portion 7 has a tubular shape in which an opening 71 is formed from one end to the other end along the longitudinal direction (tube axis direction) so as to form a C-shaped cross section. I am doing. The opening 71 is formed with a connecting member arrangement portion 71a at the center in the longitudinal direction, in which the opening width in the circumferential direction of the dilatation holding portion 7 is widened upward. In the opening 71, an opening width A (see FIG. 3) connecting both corresponding ends along the circumferential direction of the dilatation bronchi holding part 7 is formed to a width that allows the air diffuser 41 to be inserted. Specifically, the opening width A is made larger than the outer diameters of the pipe bodies 41a and 41b of the air diffuser 41. The opening width A is larger in the connecting member arrangement portion 71a than in other portions of the dilatation holding portion 7.

  The bronchial holding part 7 is attached to the branch pipe 51 of the air pipe 5 via the attachment member 8 and is arranged so that the opening 71 opens obliquely upward. The portion 7 is arranged so that the longitudinal direction thereof is substantially along the longitudinal direction (tube axis direction) of the air diffuser 41 when it is disposed in the carrier flow tank 15 during normal operation (see FIG. 6). The bronchial holding part 7 is fastened and fixed to the branch pipe 51 via the attachment member 8 with bolts.

  In addition, the bronchial holding part 7 is arranged in a range up to about 700 mm below the openings 2e, 2f, and 2g. This is the range that can be reached when the operator extends the arm from the openings 2e, 2f, and 2g.

  The case where the air diffuser 4 is taken out from the septic tank C configured as described above will be described by taking the air diffuser 4 disposed below the opening 2f as an example.

  First, the lid 3f that closes the opening 2f is opened. Since the lid 3f is a manhole lid and is lightweight, it is easy to open the lid 3f. Then, by loosening the connecting member 61 and removing the connecting portion 6, the connection between the air supply pipe 42 and the air pipe 5 is released as shown in FIG. 6. Then, the air supply pipe 42 is pulled upward, the air diffuser 41 is inserted into the air bronchi holding part 7 from the opening 71, the connecting member 41c is arranged in the connecting member arranging part 71a, and the air diffuser 41 is connected to the air bronchi holding part 7 (see FIG. 7). At this time, both ends of the connecting member 41c in the longitudinal direction of the air diffusing tube 41 are brought into contact with both ends of the connecting member arranging portion 71a in the longitudinal direction of the air diffusing bronchi holding portion 7, and movement along the longitudinal direction of the air diffusing tube 41 is restricted. Is done. Further, since the opening 71 opens obliquely upward, the air supply pipe 42 can be disposed so as to extend obliquely upward so as not to contact the branch pipe 51.

  Next, the air supply pipe 42 is rotated about the pipe axis and removed from the female screw portion 41e of the connection member 41c, thereby releasing the connection between the air supply pipe 42 and the air diffusion pipe 41, and the air supply pipe 41 42 is taken out of the tank through the opening 2f. FIG. 7 shows a state where the air supply pipe 42 is taken out in this way. Note that, as described above, since the bronchial support portion 7 is fixed to the air tube 5, even if the air supply tube 42 is rotated about its tube axis, it does not rotate, and the air diffuser 41 Therefore, it is not necessary to hold the female screw portion 41e so as not to rotate, and the air supply tube 42 can be detached from the connecting member 41c simply by holding the upper portion of the air supply tube 42 and rotating it. .

  Thus, since the connection with the air supply pipe 42 can be released in a state where the diffuser 41 is supported by the diffuser holding part 7, the connection is performed with a person supporting both the air supply pipe 42 and the diffuser 41. There is no need to cancel the operation, and it is easy for one person to work, the workability is improved, and the possibility of removing the air diffuser 41 is reduced.

  And after taking out the air supply pipe | tube 42 out of a tank, hold | grip the diffuser pipe 41 with a hand, remove from the diffuser bronchi holding part 7, incline as shown in FIG. . In FIG. 8, the symbol G is the ground.

  In addition, when removing the diffuser 4 arrange | positioned under the opening parts 2e and 2g, it is the same as that of the case of the diffuser 4 arrange | positioned under the opening part 2f.

  As described above, according to the septic tank C, the connection with the air supply pipe 42 is released in a state where the air diffuser 41 is supported by the diffuser holding part 7, and then the air diffuser 41 is tilted to open the opening 2f. Since it only has to pass through, the air supply pipe 42 can be freely tilted without the air supply pipe 42 getting in the way. Accordingly, it is not necessary to enlarge the openings 2e, 2f, and 2g, and the lids 3e, 3f, and 3g can be reduced in size, so that the weight of the lids 3e, 3f, and 3g is reduced, and the lids 3e, 3f, and 3g are opened and closed. Workability can be improved, and the manufacturing cost of the lids 3e, 3f, 3g can be reduced. And since it is not necessary to make the diffuser 4 into a complicated structure, such as making the diffuser 4 T-shaped as usual, the manufacturing cost of the diffuser 4 does not increase. Therefore, the septic tank C can be manufactured at low cost. Moreover, since inexpensive manhole covers can be diverted as the lids 3e, 3f, and 3g, the septic tank C can be manufactured at a lower cost.

  In addition, the bronchial support portion 7 has a tubular shape in which an opening 71 is formed from one end to the other end along the longitudinal direction so as to form a C-shaped cross section, and the carrier fluid tank 15 is normally operated in the longitudinal direction. It is arranged substantially along the longitudinal direction of the air diffuser 41 when it is sometimes arranged, and the opening 71 is formed so that the opening width A can be inserted into the air diffuser 41 and opens obliquely upward. Therefore, holding the air supply pipe 42, the air diffuser 4 is pulled upward, and the air diffuser 41 is inserted into the air bronchus holding part 7 through the opening 71 and supported without changing the direction of the air diffuser 41. Therefore, the work when the air diffuser 41 is supported by the air bronchus holding part 7 is easy, and the workability can be further improved. Moreover, since the structure of the bronchial bronchus holding part 7 is simple, the increase in the manufacturing cost of the septic tank C by providing the bronchial bronchi holding part 7 can be suppressed.

  Note that the attachment position of the bronchial holding portion 7 is not limited to that of the above embodiment, and can be changed, and may be attached to other than the air tube 5.

  In the embodiment described above, the opening 71 is opened obliquely upward, but this allows the air diffuser 4 to be supported by the air bronchus holding part 7 so that the air supply pipe 42 does not contact the branch pipe 51. If there is no possibility that the air supply pipe 42 comes into contact with the branch pipe 51 or other members in the septic tank C depending on the attachment position of the bronchial support 7, the opening 71 is provided. You may open it upwards.

  Further, in order to prevent the air supply pipe 42 from coming into contact with the branch pipe 51 and other members in the septic tank C, the connecting member arranging portion 71a is shifted from the central portion in the longitudinal direction of the dilated bronchial holding portion 7. You may form in a position.

  Further, only the connecting member arrangement portion 71a of the opening 71 may be opened obliquely upward, and the other portion of the opening 71 may be opened sideways. If the opening is made obliquely upward, the risk of removing the air diffuser 41 can be further reduced.

  Further, the shape of the diffuser bronchi holding portion 7 is not limited to that of the above embodiment, and can be appropriately changed according to the shape of the air diffuser 41. For example, if it is a rod-like air diffuser 41 as in the above embodiment, The diffuser bronchus holding portion 7 may be formed in a shape in which a plurality of C-shaped annular members are arranged side by side, and the air diffusing tube 41 may be inserted into these annular members.

  Further, the air supply pipe 42 may have a bent portion or may be disposed obliquely as long as it is disposed substantially along the vertical direction of the septic tank C so that it can be pulled up from the opening 2f or the like. It may be provided. The configuration of the air diffuser 4 is not limited to a substantially T shape.

  In addition, the air bronchus holding portion 7 may be provided for the air diffuser provided in the aerobic treatment tank other than the carrier fluid tank 15.

  Further, it is not always necessary to make the longitudinal direction of the bronchial support portion 7 substantially follow the longitudinal direction of the air diffuser 41 when it is disposed in the aerobic treatment tank during normal operation. It is good also as arrange | positioning so that the longitudinal direction of the support part 7 may orthogonally cross the longitudinal direction of the diffuser tube 41. FIG. That is, the arrangement position of the bronchus holding part 7 and the direction in which the longitudinal direction is directed are appropriately determined in consideration of whether the piping in the tank or other members obstructs when the air diffuser 41 is pulled up. This is a possible matter.

2e, 2f, 2g ... opening 3e, 3f, 3g ... lid 4 ... air diffuser 5 ... air tube 6 ... connecting part 7 ... air bronchus holding part 15 ... carrier flow tank 41 ... air diffuser tube 42 ... air supply pipe C ... Septic tank W ... Water surface A ... Opening width

Claims (3)

A septic tank comprising an aerobic treatment tank, an air diffuser disposed in the aerobic treatment tank for supplying air to the aerobic treatment tank, and an air tube for supplying air to the air diffuser. ,
The air diffuser is connected to the air pipe disposed below the water surface during normal operation of the aerobic treatment tank, and is detachably connected to the air diffuser and detachably connected to the air pipe. An air supply pipe disposed substantially along the direction, for sending the air supplied from the air pipe to the diffuser pipe,
The connecting portion between the air supply pipe and the air pipe is disposed above the water surface,
An opening that is closed by a lid so as to be openable and closable is formed above the connecting portion.
A septic tank, comprising a bronchial support part that removably supports the air diffusing tube below the opening and above the water surface.   The septic tank according to claim 1, wherein an opening surface of the opening is circular. The bronchial holding portion has a tubular shape in which an opening is formed from one end to the other end along the longitudinal direction so as to form a C-shaped cross section, and the longitudinal direction is disposed in the aerobic treatment tank during normal operation. Arranged substantially along the longitudinal direction of the air diffuser when being,
The opening of the bronchus holding part has an opening width connecting corresponding ends along the circumferential direction of the bronchial holding part so that the air diffusing tube can be inserted. The septic tank according to claim 1, wherein the septic tank is disposed so as to face and open.

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