JP2005040719A - Scum skimmer and its pressure switch type water level detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scum skimmer which can remove scum floating from upstream with a pipe skimmer and also remove scum behind the pipe skimmer, and its pressure switch type water level detector. <P>SOLUTION: In the scum skimmer in a sewage treatment facility, the pipe skimmer 7 having a scum discharge port 7a removing floating scum is rotated normally and reversely around its shaft, and a pressure switch type water level detection means that detects a water level based on rise in air pressure in a purge pipe 8a attached to the pipe skimmer 7. The normal or reverse rotation of the pipe skimmer 7 is stopped based on a water level detection signal from the pressure switch type water level detection means to remove the scum floating from upstream or the scum behind the pipe skimmer 7 from the scum discharge port 7a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scum removing device using a pipe schema that swallows and removes floating scum from a settling basin or the like of a sewage treatment facility, and a pressure switch type water level detecting device thereof.

  In the sewage treatment facility, sewage is first treated through the settling basin, aeration tank, and final settling basin, and the treated water is discharged into the river through the waterway in the treatment plant. Etc. are being processed. In addition, in the first and final sedimentation basins, oil and fats, solids, etc. may float as scum and block overflow weirs and waterways, so a scum removal device is provided and floating scum is manually or automatically Are collected and discharged outside the treatment plant system.

  In the conventional scum removing device, for example, a trough with an overflow weir is installed, the overflow weir is opened, and the floating scum is poured into the trough to be removed. (For example, refer to Patent Document 1) As another conventional example, there is a pipe schema that discharges scum from the scum discharge port to the outside of the treatment plant system. The pipe schema includes a fixed pipe schema. In some cases, the pipe schema is manually or automatically rotated around the axis, and the scum is discharged from the scum discharge port to the outside of the processing plant system.

  For example, there is a pipe schema shown in the main part plan view and the main part sectional view of FIGS. 6 (a) and 6 (b). In the pipe schema 1, an impeller-type scum scraping plate 2 is provided so as to be rotatable around the pipe schema 1 by a drive device 3, and a flowing water pipe 4 is disposed in the scum outlet 1 a of the pipe schema 1. Thus, miscellaneous water is supplied into the pipe schema 1. The scum scraping plate 2 has a mesh structure. The scum scraping plate 2 is rotated around the pipe schema 1 by the driving device 3 to scrape the floating scum, and is fed into the pipe schema 1 from the scum discharge port 1a. It is discharged outside the treatment plant system. (For example, see Patent Document 2)

Japanese Patent Laid-Open No. 11-90424 (full description, drawings) Japanese Patent Application Laid-Open No. 09-299940 (full description, drawings)

  However, the conventional scum removing device shown in FIG. 6 is effective for sticky scum that easily adheres to the scum outlet 1a and forms a bridge, but the pipe schema itself is fixed, , The scum scraping plate 2 may be difficult to scrape, or the scum scraping plate 2 may be swung around the pipe schema against the flow of sewage, However, there is a drawback that the scum scraping plate 2 itself must be periodically cleaned and maintenance is not easy. It was.

  Also, in other scum removal devices, the pipe schema having a scum discharge port is rotated in the direction in which the sewage flows to collect scum, and even if there is some fluctuation in the water level, the pipe schema By adjusting the rotation angle, the scum outlet can be adjusted to reach the water surface, and floating scum can be swallowed and removed from the scum outlet, but the scum flowing behind the pipe schema should be removed There was a drawback that could not.

  In addition, if the scum removing device cannot remove the scum and flows downstream of the scum removing device and adheres to and accumulates on an overflow weir such as a sedimentation basin, the accumulated scum layer must be manually crushed. However, there are disadvantages that require labor, and it is desirable to remove the scum layer by using a scum removing device as much as possible, and it is desirable that the scum layer can be removed by using the scum removing device even when the scum layer is crushed manually.

  The present invention has been made in view of the above-described problems, and a scum removing device capable of removing scum floating from the upstream with a pipe schema and also capable of removing scum behind the pipe schema and the same. An object of the present invention is to provide a pressure switch type water level detection device.

  The present invention achieves the above-mentioned object, and the invention according to claim 1 is a scum removing device in a sewage treatment facility, wherein a pipe schema having a scum outlet for removing scum floating in a sedimentation basin or the like is centered on the axis. A pressure pipe type water level detecting means for detecting the water level by increasing the air pressure in the purge pipe is provided. Based on the water level detection signal from the pressure switch type water level detection means, the rotation of the pipe schema in the forward or reverse direction is stopped and the scum discharge port is set at a position where it is slightly immersed in the water surface. Or a scum removing device that removes the scum behind the pipe schema from the scum discharge port.

  Further, the invention of claim 2 is a scum removing device in a sewage treatment facility, which has a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin or the like, and the pipe schema is centered on its axis. A driving means for rolling or reversing and a purge pipe for releasing air to the pipe schema are provided, and the tip of the purge pipe is submerged in the water surface as the pipe schema is rotated by the driving means. A pressure switch type water level detecting means for detecting a water level by detecting an increase in air pressure in the purge pipe, and a rotation for rotating the purge pipe in accordance with the rotation direction of the pipe schema in the normal direction or the reverse direction. Means for rotating the pipe schema forward or reverse by the rotating means in accordance with the rotation of the pipe schema in the normal rotation or reverse direction. The scum discharge port is set at a position where it is slightly submerged in the water surface based on the water level detection signal from the pressure switch type water level detecting means, and the scum flowing from the upstream or the scum behind the pipe schema is This is a scum removing device that is removed from the scum discharge port. The rotating means may be driven using a motor or compressed air, or may be rotated in conjunction with a driving means that rotates the purge pipe in the normal direction or the reverse direction.

  Further, the invention of claim 3 is a scum removing device in a sewage treatment facility, which has a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin or the like, and the pipe schema is centered on its axis. A driving means for rotating in the direction of rotation or reversal, and a pressure switch type water level detection means for detecting the water level of the settling basin, etc., and the water level detection unit of the pressure switch type water level detection means A purge pipe that selectively closes one of the open ends and releases the air by releasing the other is fixed to the pipe schema, and the purge pipe rotates in the forward or reverse direction of the pipe schema. The open end of the purge pipe is submerged in the water surface, an increase in air pressure in the purge pipe is detected, and the scum discharge port is slightly submerged in the water surface. Stop the rotation of the type schema, a scum removing apparatus in which the rear of the scum of scum or the pipe schema flowing from upstream so as to remove from the scum outlet.

  This purge pipe is provided with ball members at both open ends thereof, and by the inclination of the purge pipe, the inner open end on one open end side of the purge pipe is closed by the weight of the ball member and the other inward open. By releasing air from the end and rotating the pipe schema in the forward or reverse direction, the selectively opened open end is submerged in the water surface, and the rise in air pressure in the purge pipe is detected. The scum discharge port is set at a position where it is slightly submerged in the water surface, and the scum flowing from the upstream or the scum behind the pipe schema is removed from the scum discharge port.

The invention of claim 4 is the pressure switch type water level detection device of the scum removing device,
A purge pipe provided adjacent to a scum outlet opening in the longitudinal direction of the pipe schema that rotates in the forward or reverse direction, air supply means for supplying air through the pipe to the purge pipe, and air pressure in the pipe And a rotation means for orienting the open end of the purge pipe in the forward or reverse direction of the pipe schema in accordance with the forward or reverse rotation of the pipe schema. The pressure detector detects an increase in air pressure caused by turning the open end of the purge pipe toward the normal rotation or reversal direction in which the pipe schema rotates by the rotating means, and the open end of the purge pipe is immersed in the water surface. The pressure switch type water level detection device is characterized in that the water level is detected by detecting the water level, and the rotating means may be driven using a motor or compressed air, or purged. Type may be in conjunction with the drive means to rotate in the forward or reverse direction to rotate the.

The invention of claim 5 is the pressure switch type water level detection device of the scum removing device,
Adjacent to the scum outlet opening in the longitudinal direction of the pipe schema that rotates in the forward or reverse direction, it is provided in a direction perpendicular to the longitudinal direction and has an open end in the forward or reverse direction of the pipe schema. A purge pipe, an air supply means for supplying air through the pipe to the purge pipe, and a pressure detector that is operated by air pressure in the pipe, and ball members are built in both open ends of the purge pipe, respectively. As the pipe schema rotates in the forward or reverse direction, the ball member in the purge pipe selectively closes one inner open end and opens the other inner open end to release air. The pressure switch type water level detection device detects the water level by detecting an increase in air pressure due to the open end on the side from which air is discharged submerged in the water surface. It is.

  The purge pipe has a circular tube shape, and an open end and an inner open end are provided at both ends thereof, and a ball member is provided between the open end and the inner open end. The inner diameter of the inner open end is smaller than the diameter of the ball member and has a tapered shape. When the purge pipe is inclined, the inner open end of the purge pipe is changed to the tapered inner open end by the weight of the ball member. The air passage can be closed by fitting, and the air supplied to the purge pipe is discharged from the other inner open end. If the purge pipe rotates in the reverse direction, the inner open end on the opposite side is closed by another ball member, the other open end is opened, and air is released.

  According to the first aspect of the present invention, there is provided a scum removing device in a sewage treatment facility, wherein a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin or the like is rotated forward about its axis. Alternatively, based on the water level detection signal by the pressure switch type water level detection means that detects the water level by the air pressure in the purge pipe using the purge pipe attached to the pipe schema, the rotation of the pipe schema is rotated. Scum flowing from the upstream by rotation of the pipe schema in the forward or reverse direction so that the movement of the pipe schema is stopped and the position of the scum outlet of the pipe schema and the water surface is set to an optimal positional relationship. A scum removing device that removes the scum at the rear of the pipe schema from the scum discharge port, and rotates the pipe schema in the forward or reverse direction. However, it is not necessary to provide two purge pipes that are water level detection units. According to this pressure switch type water level detection means, the scum discharge port is placed at an optimum position for removing scum floating from the scum discharge port. There is an advantage that can be set, in particular, it is possible to remove the scum behind the pipe schema, even if the scum accumulates in an overflow weir such as a sedimentation basin, There is no need to scoop up and process manually, and the scum can be removed from the scum outlet by rotating the pipe schema in the reverse direction and moving the scum outlet to the rear. Is something.

  Further, according to the invention of claim 2, in the scum removing device in the sewage treatment facility, the scum removing device has a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin or the like by the driving means. The pipe schema is attached with a purge pipe of pressure switch type water level detection means, and air is supplied to the purge pipe and discharged from one side, and is rotated by the drive means. According to the pipe schema that moves, the tip of the purge pipe (water level detection unit) of the pressure switch type water level detection means is directed in accordance with the rotation of the pipe schema in the forward or reverse direction by the rotation means. At the position where the tip of the purge pipe is immersed in the water surface, the pipe schema is rotated in the normal direction or the reverse direction by the driving means so as to rotate. Effective position to remove scum from scum outlet by force switch type water level detection means outputting water level detection signal and stopping rotation at a predetermined position in forward or reverse direction of pipe schema It is not necessary to provide two purge pipes (water level detection units) of the pressure switch type water level detection means in the forward or reverse direction of the pipe schema, which is excellent in economic efficiency. Further, by adjusting the angle of the purge pipe, the weir height on the longitudinal port side of the scum discharge port can be arbitrarily set, and there is an advantage that the weir height can be adjusted according to the state of the scum. Of course, according to the present invention, the scum floating in the sedimentation basin or the like and the scum after crushing the accumulated scum can be effectively removed.

  According to the invention of claim 3, the scum removing device in the sewage treatment facility includes a pipe schema having a scum discharge port for removing scum floating in a settling basin or the like, and the pipe schema is centered on the axis center thereof. A driving means for rotating in the direction of rotation or reversal, and a pressure switch type water level detection means for detecting the water level of the settling basin, etc., and the water level detection unit of the pressure switch type water level detection means A purge pipe that selectively closes one of the open ends and releases the air by releasing the other is fixed to the pipe schema, and the purge pipe is in the normal rotation or reverse direction of the pipe schema. Inclination with rotation, the open end of the purge pipe is submerged in the water surface, the rise of the air pressure in the purge pipe is detected, and the scum discharge port is submerged slightly in the water surface. The scum removing device which stops the rotation of the pipe schema and removes the scum flowing from the upstream or the scum behind the pipe schema from the scum discharge port, and the forward or reverse direction of the pipe schema In addition, it is not necessary to provide two water level detecting parts (purge pipes) of the pressure switch type water level detecting means, and it is excellent in economic efficiency.

  For example, both end portions of the purge pipe are provided with ball members that close both open ends with their own weight, and the pipe schema rotates in the forward or reverse direction, so that either one of the purge pipes is rotated. By closing the open end with a ball member and releasing air from one of the other open ends, the open end of the purge pipe is slightly submerged in the water surface, so that the air pressure in the purge pipe is reduced. The water level is detected by raising the switch to operate at a predetermined air pressure, and the scum flowing from the upstream or the scum behind the pipe schema can be removed from the scum outlet, and the ball member It has a structure that blocks the release of air by its own weight, is a simple air blocking method, and is economical. Of course, according to the present invention, the scum floating in the sedimentation basin or the like and the scum after crushing the accumulated scum can be effectively removed.

  According to the invention of claim 4, in the pressure switch type water level detection device of the scum removing device, the purge provided adjacent to the scum discharge port opened in the longitudinal direction of the pipe schema rotating in the normal rotation or reverse direction. A pipe, an air supply means for supplying air through the pipe to the purge pipe, a pressure detector that operates with air pressure in the pipe, and the purge pipe in accordance with the rotation of the pipe schema in the forward or reverse direction. Rotating means for directing the open end of the pipe schema in the normal rotation or reversal direction of the pipe schema, and the open end of the purge pipe is rotated in the normal rotation or reversal direction by which the pipe schema rotates. A pressure switch type water level detecting device which is activated and detects the water level by detecting an increase in air pressure due to the open end of the purge pipe being submerged in the water surface by the pressure detector. There are, by adjusting the stop angle of the purge pipe by rotation means, there is an advantage that can be arbitrarily set weir height of scum outlet even water level fluctuates. Moreover, there is no need to provide purge pipes in the forward and reverse directions of the pipe schema, which is advantageous in terms of economy.

  According to the invention of claim 5, in the pressure switch type water level detection device of the scum removing device, the scum discharge port opens in the longitudinal direction of the pipe schema rotating in the forward rotation direction or the reverse rotation direction. And a purge pipe having an open end in the forward or reverse direction, an air supply means for supplying air through the pipe to the purge pipe, and a pressure detector operated by air pressure in the pipe. In addition, a ball member is built in each of the open ends of the purge pipe, and the ball member in the purge pipe has one open end as the pipe schema rotates in the forward or reverse direction. Close and open the other open end of the purge pipe so that air is released, and the pressure detector detects an increase in air pressure due to the open end being submerged in the water surface. The air is supplied from the center of the purge pipe, the ball member rolls under its own weight, closes one open end, and discharges air from the other open end. The water level is detected by detecting an increase in air pressure due to the open end of the sewage being submerged in the surface of the sewage, and this device does not require a turning means for the purge pipe. There is an advantage that it is possible to detect the level of sewage in the normal rotation direction or the reverse rotation direction, and it is more economical. Of course, the pipe schema is provided with a pivot means and a purge pipe is provided, and the stop angle is adjusted by the pivot means so that the position where the tip of the pipe schema contacts the water surface can be adjusted according to the fluctuation of the water level. It may be.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a scum removing device and a pressure switch type water level detection device according to the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment in which the scum removing device of the present invention is installed in a sedimentation basin. FIG. 1 (a) is a schematic sectional view thereof, and FIG. 1 (b) is a schematic front view thereof. 2 (a) and 2 (b) are schematic cross-sectional views of the main part of the scum removing device equipped with the pressure switch type water level detecting device of the present embodiment, and FIGS. 2 (c) and 2 (d) are plan views of the main part thereof. FIG. FIGS. 3A and 3B are cross-sectional views of the main part showing another form of the rotation mechanism of the present embodiment.

(Embodiment 1)
The scum removing device and its pressure switch type water level detecting device of the present embodiment will be described with reference to FIGS. 1 (a), 1 (b) and FIG. The scum removing device is installed in the first sedimentation basin 5, the first sedimentation basin 5 is a rectangular sedimentation basin, the overflow wall 5a is provided on the rear side wall, and the settled sludge is scraped off from the pond floor. There is a flight type sand scouring machine. The overflow water that has overflowed the overflow section 5a flows into the second sedimentation basin and the like through the water conduit. The scum floating on the water surface of the first sedimentation basin 5 is collected by a scum removing device 6 attached to the first sedimentation basin 5.

  The scum removing device 6 is mainly composed of a pipe schema 7 and a pressure switch type water level detecting device 8. The pipe schema 7 is provided with a number of scum discharge ports 7a, and both ends of the pipe schema 7 are rotatably supported by bearings 7b on the left and right side walls, and are arranged horizontally in a direction orthogonal to the flow of sewage. By driving the electric motor (driving means) 9, the motor 9 is rotated in the forward or reverse direction. The pipe schema 7 is provided with a purge pipe (water level detector) 8 a of the pressure switch type water level detection device 8, and the purge pipe 8 a rotates together with the pipe schema 7. Moreover, the shape of the purge pipe 8a is a circular tube with both ends open, and air is supplied from one side and discharged from the other.

A purge pipe 8 a which is a water level detection unit of the pressure switch type water level detection device 8 is attached to a rotation shaft of a rotation means 8 b such as a motor mounted on an attachment plate 11 fixed to the pipe schema 7. The open end 8a ₂ of the purge pipe 8a is a pipe 12 which air is fed is connected, the other open end portion 8a ₁ is air is released is released. The pipe 12 is provided with a pressure switch 8c that operates at a predetermined air pressure and outputs a water level detection signal, a pressure gauge 8d that measures the air pressure in the pipe 12, and a blower 8e that sends air to the purge pipe 8a. The axis C where the purge pipe 8a rotates is on the center line of the opening cross section of the scum discharge port 7a, and the relationship between the tip of the purge pipe 8a and the weir height of the scum discharge port makes the purge pipe 8a correct. Even if it is rotated in the rolling or reversing direction, it is set so as to have the same relationship. For example, a flexible pipe is used as the pipe 12 in the vicinity of the purge pipe 8a. Further, the blower 18e is a pressurized air supply means, and may be, for example, an air pump.

As the rotation of the pipe schema 7, the open end 8a ₁ of the purge pipe 8a is submerged surface of the water, the pressure switch 8c is actuated pneumatic purge pipe 8a and the pipe 12 rises, the water level from the pressure switch 8c A detection signal is output and input to the control device 10. The control device 10 outputs a control signal for stopping the electric motor 9 based on the water level detection signal. Further, the control device 10 can be programmed with a procedure for detecting the water level of the first sedimentation tank, and the pressure switch type water level detection device 8 can be controlled to detect the water level intermittently. The blower (air supply means) 8e may also serve as a blower that supplies aeration air supplied to the aeration tank of the sewage treatment facility. The pressure switch 8c is preferably a differential pressure type pressure switch so as not to be affected by atmospheric pressure fluctuations. The control device 10 also controls the turning means 8b of the purge pipe 8a.

Then, with reference to FIG. 1, FIG. 2, operation | movement of the scum removal apparatus which installed the pressure switch type water level detection apparatus is demonstrated in detail. 2A and 2C show a state in which the scum pipe 7 is rotated in the forward rotation direction, and FIGS. 2B and 2D show a state in which the scum pipe 7 is rotated in the reverse direction. ing. The purge pipe 8a is rotated by a predetermined angle in the normal rotation direction of the scum pipe 7 by the rotation means 8b and stopped. For example, this angle is set as the stop angle. Rotates the Sukamupaipu 7 in the forward direction by the drive unit 9, FIG. 2 (a), the as shown (c), the open end 8a ₁ of the purge pipe 8a is submerged in water, the purge pipe 8a, The air pressure in the pipe 12 increases. When the air pressure reaches a predetermined air pressure, the pressure switch 8c is actuated, a water level detection signal is input to the control device 10, and based on the stop signal from the control device 10, the driving means 9 is controlled to rotate the scum pipe 7. Stop. The longitudinal opening edge of the scum discharge port 7a is immersed in the water surface and set to a predetermined weir height, the floating scum is swallowed into the scum pipe 7 from the scum discharge port 7a, and the scum is removed. The purge pipe 8a and the scum pipe 7 may be rotated simultaneously.

On the other hand, in the case where the floating scum goes around the scum pipe 7, the purge pipe 8 a is rotated by a predetermined angle in the reversing direction of the scum pipe 7 by the rotating means 8 b and stopped, and the purge pipe 8 a is driven by the driving means 9. Turn in the reverse direction. FIG. 2 (b), the as shown (d), the open end 8a ₁ of the purge pipe 8a is submerged in water, the purge pipe 8a, the air pressure in the pipe 12 reaches the predetermined air pressure rises, the pressure The switch 8c is actuated, and a water level detection signal from the pressure switch 8c is input to the control device 10, and based on a stop signal from the control device 10, the drive means 9 is controlled to stop the rotation of the scum pipe 7. The scum discharge port 7 a is set to a predetermined weir height and can remove floating scum behind the scum pipe 7.

  The rotation means 8b of the purge pipe 8a is not limited to the above-mentioned form, and as shown in FIG. 3, a drive gear 8f is provided on the rotation shaft of the rotation means 8b, and the purge gear 8f is combined with the purge gear 8f. You may make it rotate the attaching part 11a of the pipe 8a. Moreover, you may rotate the rotation means 8b using compressed air.

In the above-described embodiment, pressurized air of, for example, about 100 mmH ₂ O (about 980 Pa) is released from the open end 8a ₁ of the purge pipe 8a. When the open end 8a ₁ of the purge pipe 8a reaches the water surface, overflow surface, which is one side of a scum outlet 7a of the pipe schema 7 (longitudinal opening edge) is submerged slightly the surface of the water, further pipes schema 7 When it is rotated and the weir height A reaches about 45 mm, the floating scum flows from the scum outlet 7 a of the pipe schema 7.

  The purge pipe 8a is preferably made of a material that does not corrode due to hydrogen sulfide generated in a sedimentation basin or the like. In addition, a material that does not corrode even if scum or contaminants adhere to it is preferable. Further, as the material of the purge pipe 8a, a material having good water repellency is preferable and may be subjected to Teflon processing. Moreover, the lining process for preventing corrosion may be performed.

  The water level fluctuates in the sedimentation basin. Therefore, if the water level measurement by the pressure switch type water level detection device 8 is performed only once, the weir height due to the fluctuation of the water level becomes too high with time, and the treated water is unnecessarily stored in the pipe schema 7. It is not economical to flow in, and if the weir height is too shallow, there will be a situation where scum cannot be recovered sufficiently. Therefore, depending on the tendency of the water level fluctuation of the sedimentation basin in which the scum removing device is installed, it is preferable to measure the water level at intervals of 3 to 4 minutes, for example.

(Embodiment 2)
Another embodiment of the present invention will be described with reference to FIGS. 4A is a cross-sectional view of the main part of the purge pipe, and FIG. 4B is a front view thereof. 5 (a) and 5 (b) are side views of the main part of the scum removing device. In addition, the pressure switch type water level detection apparatus of this embodiment is substantially the same except for the above embodiment and the water level detection unit (purge pipe).

  The purge pipe 13 of the present embodiment will be described with reference to FIGS. 4A and 4B. The purge pipe 13 has a pipe shape in which an air ventilation path is provided, and both ends are opened to open both ends. Ends 13a and 13e are formed. Inner open ends 13c and 13d are formed on the inner side of both open ends 13a and 13e. The inner diameters of the inner open ends 13c and 13d, that is, the central portion of the flow path of the purge pipe 13 are formed. The inner diameter is smaller than the inner diameter of the air passages at both open ends 13a and 13e. The inner open ends 13c and 13d are tapered, and the ball member 14a is stored between the open end 13a and the inner open end 13c, and the ball member 14b is stored between the open end 13e and the inner open end 13d. Then, the ball members 14a and 14b are fitted into tapered portions formed at the inner open ends 13c and 13d so that the air passage of the purge pipe 13 is closed. Meshes 13b and 13f are provided in the vicinity of both open ends 13a and 13e to prevent the ball members 14a and 14b from falling by their own weight when the purge pipe 13 is inclined. An air supply port 15 is provided at the center of the air passage of the purge pipe 13. Note that the meshes 13b and 13f may be slit-shaped.

  As shown in FIGS. 5A and 5B, the purge pipe 13 is provided on the mounting plate 16 fixed to the pipe schema 7. When the pipe schema 7 is rotated in the forward rotation direction, the purge pipe 13 is rotated. Depending on the slope. FIG. 5A shows a case where the pipe schema 7 is rotated in the forward rotation direction, and FIG. 5B shows a case where the pipe schema 7 is rotated in the reverse direction. As the pipe schema 7 rotates, the purge pipe 13 inclines. In FIG. 5A, the ball member 14a closes the inner open end 13c of the air flow path, and the ball member 14b falls to cause the air flow path. The inner open end 13d is opened, and the air supplied from the air supply port 15 is discharged from the open end 13e. In the case of FIG. 5B, the ball member 14b blocks the inner open end 13d of the air flow path, and the ball member 14a opens the inner open end 13c of the air flow path to supply from the supply port 15. The discharged air is discharged from the open end 13a. A pipe 12 is connected to the supply port 15 in the same manner as in the above embodiment. A pressure switch 8c, a pressure gauge 8d, and a blower 8e are connected to the pipe 12, and a control device 10 that receives a water level detection signal from the pressure switch 8c is provided. Is provided. In addition, the pipe schema 7 is provided with an electric motor (driving means) 9 that rotates in the forward or reverse direction, and is controlled by the control device 10.

  When the pipe schema 7 is rotated and the open end 13a or the open end 13e of the purge pipe 13 is submerged in the water surface, the flow of air released from the purge pipe 13 is hindered, and the air pressure in the pipe 12 increases. Then, the pressure switch 8 c is activated and a water level detection signal is input to the control device 10, and a control signal is output from the control device 10 so as to stop the electric motor 9. The scum outlet 7a of the pipe schema 7 is set to a predetermined weir height, and the scum is swallowed into the pipe schema 7 from the scum outlet 7a of the pipe schema 7 and removed.

  The purge pipe 13 is preferably made of a material that is not corroded by hydrogen sulfide generated in a sedimentation basin or the like, as in the above embodiment. In addition, a material that does not corrode even if scum or foreign matter adheres is preferable. Further, as the material of the purge pipe 13, a material having good water repellency is preferable, and it may be one that has been subjected to Teflon processing. Moreover, the lining process for preventing corrosion may be performed.

  The present invention can be installed in an industrial wastewater treatment facility other than a sewage treatment facility. Moreover, the pressure switch type water level detection device can be used for facilities other than the sewage treatment facility.

Embodiment which installed the scum removal apparatus of this invention in the sedimentation basin is shown, The figure (a) is the schematic sectional drawing, The figure (b) is the schematic front view. (A), (b) is a principal part schematic sectional drawing of the scum removal apparatus equipped with the pressure switch type water level detection apparatus of this embodiment, (c), (d) is those principal part top views. (A), (b) is principal part sectional drawing which shows the other form of the rotation mechanism of this embodiment. (A) is principal part sectional drawing of the purge pipe in the scum removal apparatus of other embodiment of this invention, (b) is the front view. (A), (b) is a principal part side view of the scum removal apparatus using the purge pipe of FIG. (A), (b) is the principal part top view and principal part sectional drawing of the conventional scum removal apparatus.

Explanation of symbols

5 Sedimentation basin 6 Scum removal device 7 Pipe schema 7a Scum outlet 8 Pressure switch type water level detection device (pressure switch type water level detection means)
8a Purge pipe 8b Motor (turning means)
8d Pressure gauge 8c Pressure switch 8e Blower (air supply means)
9 Electric motor (drive means)
DESCRIPTION OF SYMBOLS 10 Control apparatus 11 Mounting plate 12 Piping 13 Purge pipe 13a, 13e Open end part 13c, 13d Inner open end 14a, 14b Ball member 15 Air supply port

Claims (5)

  In a scum removal device in a sewage treatment facility, a purge pipe that rotates a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin or the like in a normal rotation direction or a reversal direction about its axis, and that is supplied and discharged with air. A pressure switch type water level detecting means attached to the pipe schema and detecting the water level by an increase in air pressure in the purge pipe is provided. Based on a water level detection signal from the pressure switch type water level detecting means, The rotation in the direction of rotation or reversal is stopped, the scum discharge port is set at a position slightly immersed in the water surface, and the scum from the upstream or the scum behind the pipe schema is removed from the scum discharge port. A scum removing device.   A scum removing device in a sewage treatment facility includes a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin, etc., driving means for rotating or reversing the pipe schema around its axis, and the pipe schema A purge pipe for releasing air is provided, and the rise of the air pressure in the purge pipe is detected by the tip of the purge pipe being submerged in the water surface as the pipe schema is rotated by the driving means. A pressure switch type water level detecting means for detecting the water level and a rotating means for rotating the purge pipe in accordance with the normal rotation direction or the reverse rotation direction of the pipe schema. Or the tip of the purge pipe is directed to the forward or reverse direction of the pipe schema by the turning means according to the turning in the reverse direction, and the pressure switch type water Based on the water level detection signal by the detection means, the scum discharge port is set at a position where it is slightly submerged in the water surface, and the scum flowing from the upstream or the scum behind the pipe schema is removed from the scum discharge port. A scum removing device.   A scum removing device in a sewage treatment facility includes a pipe schema having a scum discharge port for removing scum floating in a sedimentation basin and the like, and a driving means for rotating the pipe schema in a normal rotation direction or a reverse direction about its axis. A pressure switch type water level detection means for detecting the water level of the settling basin, etc., and the water level detection part of the pressure switch type water level detection means selectively supplies either one of the open ends of the supplied air. A purge pipe, which is closed and opened to release air, is fixed to the pipe schema, and the purge pipe is inclined as the pipe schema rotates in the forward or reverse direction, and the purge pipe is opened. The opened open end is submerged in the water surface, detecting an increase in air pressure in the purge pipe, and stopping the rotation of the pipe schema at a position where the scum discharge port is slightly submerged in the water surface; Scum removing apparatus and removing the back of the scum of scum or the pipe schema flowing from the flow from the scum outlet. In the pressure switch type water level detection device of the scum removal device,
A purge pipe provided adjacent to a scum outlet opening in the longitudinal direction of the pipe schema that rotates in the forward or reverse direction, air supply means for supplying air through the pipe to the purge pipe, and air pressure in the pipe And a rotation means for orienting the open end of the purge pipe in the forward or reverse direction of the pipe schema in accordance with the forward or reverse rotation of the pipe schema. The pressure detector detects an increase in air pressure caused by turning the open end of the purge pipe toward the normal rotation or reversal direction in which the pipe schema rotates by the rotating means, and the open end of the purge pipe is immersed in the water surface. A pressure switch type water level detection device characterized by detecting the water level by detecting the water level. In the pressure switch type water level detection device of the scum removal device,
Adjacent to the scum outlet opening in the longitudinal direction of the pipe schema that rotates in the forward or reverse direction, it is provided in a direction perpendicular to the longitudinal direction and has an open end in the forward or reverse direction of the pipe schema. A purge pipe, an air supply means for supplying air through the pipe to the purge pipe, and a pressure detector that is operated by air pressure in the pipe, and ball members are built in both open ends of the purge pipe, respectively. As the pipe schema rotates in the forward or reverse direction, the ball member in the purge pipe selectively closes one inner open end and opens the other inner open end to release air. The pressure switch type water level is characterized in that the water level is detected by detecting a rise in air pressure due to the open end on the side from which the air is discharged submerged in the water surface. Intelligence apparatus.

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