JP2006142264A - Apparatus for discharging scum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for discharging scum which can securely follow the variation of a water level and securely discharge the scum or the like considering that the apparatus for discharging the scum made to follow the whole range of a variation does not maintain the posture of a tap and smoothly follow the variation of the water level in a treatment tank having a large variation of the water level such as a batch reactor. <P>SOLUTION: A tap part 22 having the tap 22a is connected to the upper end part of a freely stretched communication pipe 21 communicating with the suction port of a scum pump 26 through a freely stretched bellows pipe 23, and a float 24 is interconnected to the tap part 22. The communication pipe 21 is interconnected to a screw rod 27 which can be operated from the outside of a reactor 10, and rise and fall, thereby enabling the communication pipe 21 to be stretched due to rise and fall of the screw rod 27. The tap 22a is provided so as to follow a small change of the water level by the bellows pipe 23 and a large variation of the water level by a stretch of the communication pipe 21. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scum discharge device that discharges impurities floating on the surface of a treatment tank such as a precipitation tank or a reaction tank used in a water treatment facility or the like, and floating substances such as scum that floats or is generated on the water surface.

  In water treatment facilities, water to be treated such as sewage is allowed to flow into treatment tanks such as sedimentation tanks and reaction tanks, sludge and organic components are removed, and supernatant water is appropriately disinfected before being discharged into rivers, etc. Has been done. In a large-scale water treatment facility, each of these treatment tanks such as a precipitation tank and a reaction tank is provided separately, and is continuously treated while supplying water to be treated. On the other hand, in a small and medium-sized water treatment facility, since the equipment cost and the operation cost are suppressed, the precipitation treatment and the reaction treatment can be performed in a single treatment tank without providing separate treatment tanks such as the precipitation tank and the reaction tank. Some of them are processed in a so-called batch processing facility that is used in a batch reaction tank. In this batch type treatment facility, water to be treated is supplied to a batch type reaction tank, and aerobic treatment, precipitation treatment, and waste water treatment are performed for a predetermined time, and batch treatment is used.

  By the way, after performing the aerobic treatment and the precipitation treatment, impurities in the water to be treated rise, and floating substances such as scum and oil are generated. Therefore, the floating substances such as scum are removed. . This drains from the surface of the water to be treated and discharges suspended matter together with the drainage. A scum discharge device having a float-type tap is used. That is, even when the water level drops and changes due to the drainage of the water to be treated, the throat is kept facing the water surface due to the buoyancy of the float, and the treated water from the throat to the surface with the scum pump connected to the throat. Along with the inhalation of suspended matter.

  In this type of scum discharge device, as shown in FIG. 7, as shown in FIG. 7, a throat portion 1 in which a throat 1 a is formed and a scum pump 2 in which a suction port is connected to the throat 1 a, There is a float 3 that keeps the mouth 1a floating so as to face the water surface Ls. A flexible hose 4 made of vinyl or rubber is connected to the discharge port of the scum pump 2, and this hose 4 is connected to a scum separating device (not shown) installed on the ground. That is, the floating material such as scum on the water surface and the water to be treated are sucked from the throat 1a by the operation of the scum pump 2, and the floating material and the water to be treated are separated by the scum separating device. When the water level changes, the float 3 tries to follow the shed 1 and the scum pump 2 or the like.

  However, in such a structure, when the water level changes, the length of the flexible hose below the water surface changes, so the total weight applied to the float changes. For this reason, the balance with the buoyancy may be lost, and the waterhole may protrude above the water surface without being exposed to the water surface, or may be submerged, making it impossible to remove the suspended matter.

  Further, the scum discharge device having the structure shown in FIG. 8 holds the mouth part 1 in which the mouth 1a is formed connected to the float 3, and the mouth part 1 is a stretchable communication having a double pipe structure. The suction port of the scum pump 6 is communicated with the scum pump 6 through the pipe 5, and the discharge port of the scum pump 6 is connected to a scum separation device (not shown). That is, when the communication pipe 5 expands and contracts, the float 3 can follow the change in the water level. The scum pump 6 is operated to suck in the suspended matter on the water surface and the water to be treated from the throat 1a and feed it to the scum separating device.

  However, in order for the communication pipe 5 to be able to expand and contract smoothly, the gap between the double pipes must be ensured to a sufficient size, and impurities in the water to be treated enter the gap, and the expansion and contraction is caused. May not be able to smoothly slide, and the shed 1 may not be able to follow the water level. In addition, pressure is applied to the joint portion of the double pipe due to the water flow generated when the inside of the treatment tank is stirred, and in some cases, the joint portion may be bent and may not be able to expand and contract thereafter.

  Moreover, there exists a thing described in patent document 1 as a scum removal apparatus provided with the structure which follows a change of a water level by expanding and contracting. This scum removing device is a scum removing device that sucks and removes scum that floats on the liquid surface into the transfer pipe, and can be moved up and down following the fluctuation of the water level on the liquid surface. And at least one sliding surface of the float part and the transfer pipe is provided with a plurality of ridges along the moving direction of the float part. Further, in the scum removing device described in the same document 1, the suction part is connected to the distal end side of the transfer pipe provided with the float part by a cylindrical connection socket press-fitted into the transfer pipe. A male screw is formed on the outer peripheral surface of the connection body of the part, and a female screw that is screwed with the male screw is formed inside the connection socket. Accordingly, the vertical position of the suction portion with respect to the transfer pipe can be adjusted by adjusting the male screw of the connection body.

JP-A-7-24453

  In the scum removing device described in Patent Document 1, the vertical position of the suction portion can be adjusted by adjusting the screwing position of the male screw of the connection body and the female screw of the connection socket. This adjustment work is manual, and the parts such as the connection socket are located in the water to be treated, and this scum removing device is provided in the treatment tank, so this adjustment work is difficult to perform frequently. Moreover, since the adjustment range is not large, it is suitable for a treatment tank having a substantially constant water level.

  On the other hand, since the batch-type reaction tank described above is batch-processed in a single processing tank, the processing to be executed every predetermined time may be changed. The amount of treated water varies greatly and the water level in the treatment tank is not constant. It is difficult to follow the shed over the entire range of this large fluctuation, and a device that assumes that the water level is constant, such as the scum removing device described in Patent Document 1, cannot sufficiently cope with it. Further, in the scum removing device described in the same document, since a gap is formed between the cylinder and the suction body to ensure these sliding operations, impurities in the water to be treated enter this gap. Therefore, there is a possibility that smooth sliding cannot be performed and the change in the water level cannot be followed.

  Therefore, the present invention can reliably cope with the fluctuation of the water level as necessary in the case of a treatment tank having a large fluctuation of the water level, and also reliably cope with the change of the water level during the treatment. An object of the present invention is to provide a scum discharge device that can discharge floating substances such as scum.

  As a technical means for achieving the above object, the scum discharge device according to the present invention uses a scum pump to remove floating substances such as scum and oil that have floated on the liquid surface of the liquid to be treated stored in the treatment tank. In the scum discharge device that sucks together with the liquid and feeds it to the scum separation device, the float is connected to the throat portion provided with the throat, and the throat is exposed to the liquid surface by receiving the buoyancy, The telescopic pipe is interposed between the throat and the communication pipe for communicating the scum pump, and the communication pipe is made to be extendable and contractable as a double pipe structure composed of an upper pipe and a lower pipe. An operating mechanism for operating from the outside of the processing tank to the operating arm, operating the operating mechanism to slide the upper tube relative to the lower tube, Change height position So, the expansion pipe expands and contracts in response to changes in liquid level, bung hole is characterized in that following the liquid level in the expansion range.

  When discharging floating substances such as scum, the scum pump is operated and the liquid to be treated is sucked from the mouth. This mouth is exposed to the liquid surface, and suspended matter such as scum is sucked together with the liquid to be treated, and is fed to the scum separating device. When the liquid level changes, the mouth portion receiving the buoyancy of the float is allowed to follow this change by the expansion and contraction of the telescopic tube. The discharge operation of floating substances such as scum is performed for a relatively short time because it is performed before the floating object floats and before the liquid to be processed is fed to the next process. For this reason, since the operation time of the scum pump is short and it is only necessary that the shed can cope with the change in the liquid level within this operation time, if the expansion / contraction length of the expansion / contraction tube is appropriate, the expansion / contraction of the expansion / contraction tube Sufficiently follow changes in liquid level.

  Further, the operation of the operation mechanism may be performed manually, electrically operated using a drive motor, or operated by hydraulic pressure or air pressure. However, if the discharge work of suspended matter such as scum is a short time and can be handled within the expansion / contraction range of the expansion / contraction tube, it is not necessary to expand / contract the communication tube. Yes. In particular, in the batch reaction tank, the fluctuation of the water level is large, and the scum discharge device may not be able to follow the fluctuation of the water level due to the conventional structure described above. In addition, in a facility using a batch-type reaction tank, the amount of water to be treated in the treatment tank varies depending on the season or depending on the time of the day. In this case, the communication mechanism may be expanded and contracted by operating the operation mechanism as necessary. In addition, when the suspended matter cannot be sufficiently discharged by the expansion and contraction of the expansion tube, the communication tube is expanded and contracted.

  According to a second aspect of the present invention, in the scum discharge device, the operating mechanism includes a screw rod formed with a male screw and connected to the operating arm portion, and a handle or lever having a female screw threadedly engaged with the male screw. The screw rod is moved up and down by the operation of the operation unit, and the upper tube is slid with respect to the lower tube.

  For example, like a gate valve opening / closing mechanism, the handle is in a fixed position and the shaft portion is raised and lowered according to the rotation direction of the handle. When the handle is rotated, the screw rod moves up and down and the communication pipe expands and contracts. As long as the operating mechanism is a mechanism that is linked to the operating arm and slides the upper tube with respect to the lower tube, for example, a piston / cylinder mechanism can be used. If it is a combination with a handle or the like, it has a simple structure, is easy to operate, and the sliding distance can be easily adjusted.

  According to the scum discharge device according to the present invention, when the liquid level changes, the telescopic tube surely expands and contracts by receiving the buoyancy of the float, so that the spout is reliably maintained facing the liquid surface, and the scum It is possible to suck in the suspended matter such as. In addition, since the posture of the shed does not tilt, suspended matter can be sucked into the shed from the radial direction.

  In addition, since the communication pipe can be expanded and contracted from the outside of the liquid to be treated, it is possible to quickly cope with fluctuations in the liquid level and to reliably discharge floating matters.

  Further, according to the scum discharge device according to the second aspect of the invention, the screw rod can be surely moved up and down in accordance with the turning direction of the handle and the lever, and the moving amount of the lifting and lowering can be easily adjusted, and the liquid level can be changed. Can be reliably handled with simple operations.

  Hereinafter, the scum discharge device according to the present invention will be described in detail based on the illustrated preferred embodiment. In this embodiment, a scum discharge device suitable for use in a batch reaction tank that is a treatment tank of a batch water treatment facility is shown.

  FIG. 6 is a schematic plan view of a facility in which two batch-type reaction tanks 10 are juxtaposed. Each of the reaction tanks 10 includes an aeration apparatus 11 having a stirring device and the like, a scum discharge apparatus 12, and a drainage apparatus 13. Is provided. When the water to be treated is supplied to the reaction tank 10, for example, aerobic treatment that is stirred and activated while supplying air with the aeration apparatus 11 is performed, and then precipitation is performed to precipitate sludge and the like. Let Thereafter, the supernatant water is drained from the reaction tank 10 by the drainage device 13 and fed to the next process. The scum discharge device 12 sucks and discharges impurities, scum, oil, and other floating substances together with the water to be treated on the water surface in a state where the impurities in the water to be treated that have been stirred and come into contact with oxygen have floated. Since this scum discharge process is performed in a state where the scum etc. is floating, it is performed before the drainage process. In addition, since the batch processing is performed from the inflow of the water to be treated to the drainage treatment in one reaction tank 10, different treatments are performed in the plurality of reaction tanks 10 at different times. When the floating material is discharged by the scum discharging device 12, the floating material such as scum on the water surface is drawn to the scum discharging device 12, so that the draining device 13 discharges the scum so that the floating material is not accompanied by the waste water during the waste water treatment. It is arranged at a position away from the device 12.

  Next, the scum discharge device 12 according to the present invention will be described based on the embodiment shown in FIGS. FIG. 1 is a view for explaining the structure of the scum discharge device 12, and is a view taken along the line BB in FIG. A communication tube 21 is arranged in the batch reaction tank 10, and a mouth portion 22 is connected to an upper end portion of the communication tube 21 through a bellows tube 23 that can be expanded and contracted as an expansion tube in the longitudinal direction of the communication tube 21. Is provided. A top 22 a is provided with an opening on the top surface of the top 22, and the top 22 a communicates with the communication pipe 21.

  FIG. 2 is a plan view of the mouth portion 22, and a flange 22c is fastened to the upper end of the tube 22b. Under the flange 22c, there are four substantially L-shaped brackets 22d as shown in FIG. Projected in the direction and attached. The shed 22a is formed by the opening of the tube 22b. The front end of the bracket 22d is positioned lower than the shed 22a so that the bracket 22d does not become an obstacle to the suction of floating substances when the water to be treated is sucked from the shed 22a. A float 24 is attached to the tip end via a support rod 24a, and the shed 22a faces the water surface Ls under the buoyancy of the float 24.

  The communication pipe 21 has a double-pipe structure composed of a small-diameter upper pipe 21a and a large-diameter lower pipe 21b that accommodates the upper pipe 21a. It is as. Further, a connecting pipe 25 is interposed between these connecting portions, and the upper pipe 21a slides on the inner surface of the connecting pipe 25. The lower pipe 21b is supported by a support bracket (not shown) attached to the inner wall surface of the reaction tank 10, and the communication pipe 21 is supported by the wall surface of the reaction tank 10. The lower pipe 21b communicates with a suction port of a scum pump 26 installed on the bottom surface 10a of the reaction tank 10, and a discharge port of the scum pump 26 communicates with a scum separation device (not shown) installed on the ground. .

  A support arm 27a as an operation arm portion is attached to the upper portion of the upper tube 21a, and a screw rod 27 having a vertical direction as a longitudinal direction is rotatably supported at a distal end portion of the support arm 27a. Yes. As shown in FIG. 1, the upper portion of the screw rod penetrates the ceiling portion 10b of the reaction tank 10 and protrudes upward with an appropriate length, and the intermediate portion is guided and supported by a support bracket 27b. A male screw is formed in an appropriate range on the upper portion of the screw rod 27, and is linked to a handle 28 as an operation unit in which a female screw to be screwed with the male screw is formed above the ceiling portion 10b. . That is, the screw rod 27 and the handle 28 constitute an operation mechanism. The handle 28 is supported so that it can rotate about the vertical direction with respect to the handle bracket 28a attached to the ceiling portion 10b and cannot move up and down. Therefore, when the handle 28 is rotated, the screw bracket 27 is raised and lowered according to the rotation direction.

  FIG. 3 shows the upper pipe 21a, and three guide rods 21c are implanted at the upper end, and the bellows pipe 23 is loosely fitted to the guide rod 21c, so that the water level rises more than expected. In this case, the bellows tube 23 is protected from being extended. FIG. 4 shows the lower tube 21b. Further, a connecting pipe 25 shown in FIG. 5 is interposed at a joint portion between the upper pipe 21a and the lower pipe 21b. The connection pipe 25 has a structure having a reduced diameter part 25a with a reduced diameter at the upper and lower parts, and the sliding of the upper pipe 21a is guided on the inner peripheral surface of the reduced diameter part 25a. The reduced diameter portion 25a is preferably formed by fitting a bush formed of a material having oil-free lubricity.

  The operation of the scum discharge device according to the embodiment of the present invention configured as described above will be described below.

  When the waste water treatment is completed in the batch reaction tank 10, the water level is the lowest, and in this state, the mouth portion 22 of the scum discharge device 12 protrudes from the water surface. At this time, according to the supply amount of the water to be treated supplied at that time, the handle 28 is rotated to adjust the height of the mouth portion 22 in advance. When the handle 28 is rotated, the screw rod 27 screwed with the handle 28 is raised and lowered according to the rotation direction. A support arm 27a is connected to the tip of the screw rod 27, and the support arm 27a is attached to the upper pipe 21a of the communication pipe 21, so that the upper pipe 21a is It moves up and down with respect to the lower tube 21b. For this reason, the throat portion 22 provided at the upper end portion of the upper pipe 21a also moves up and down, and the height is adjusted.

  When the water to be treated is supplied to the reaction tank 10, the water level gradually rises, and the above-described aerobic treatment, precipitation treatment, and waste water treatment are sequentially performed. During these processes, when the water level reaches a predetermined height, it is detected by a water level detection sensor (not shown) installed in the reaction tank 10, and the scum pump 26 starts operating at a suitable time, for example, after the completion of the precipitation process. . The water level at this time is a height at which the water to be treated can be sucked from the mouth 22a of the mouth portion 22, and the water to be treated is sucked from the water surface by the operation of the scum pump 26. There are floating substances such as scum and oil on the water surface, which are sucked together with the water to be treated, fed to the scum pump 26 through the communication pipe 21, and fed to the scum separator from the discharge port. In the scum separator, the suspended matter and the water to be treated are separated, the treated water is returned to the reaction tank 10, and the suspended matter such as scum is discarded.

  The scum pump 26 is stopped when a predetermined time elapses from the start of operation by a timer. When the scum pump 26 is operated to suck in the water to be treated, the water level is lowered and the float 24 follows and descends. Since the mouth portion 22 supporting the float 24 and the communication pipe 21 are connected by the bellows tube 23, the lowering of the float 24 is permitted by the contraction of the bellows tube 23, and the mouth portion 22 is also lowered. Thus, the shed 22a is maintained in a state of facing the water surface, and the suction of water to be treated can be continued. At this time, since the expansion / contraction amount of the bellows tube 23 is limited, the operation time of the scum pump 26 is set according to the expansion / contraction amount. That is, the scum pump 26 is set to stop before the bellows tube 23 reaches the maximum contraction amount.

  If the suspended matter such as scum cannot be sufficiently discharged even by the operation of the scum pump 26 described above for a predetermined time, the discharging process is continued by manual operation. In this case, the handle 28 is rotated and moved to a position where the shed 22a faces the water surface, and the scum pump 26 is turned on to operate. If the suspended matter is discharged enough to perform the waste water treatment, the scum pump 26 is turned off and stopped.

  When the waste water treatment is completed, the water to be treated is discharged from the reaction tank 10, and the water to be treated is newly supplied.

A scum discharge device 12 according to this embodiment is installed in a batch reaction tank 10 of 11 m × 6 m, a bellows tube 23 having an expansion / contraction amount of 200 mm, and a scum pump 26 having a discharge amount of 0.55 m ³ / min. When used, the scum pump 26 can be operated for 24 minutes within the range of expansion and contraction of the bellows tube 23. Then, the operation of the scum pump 26 is started when the operating water level is reached, a timer is set so as to stop within 24 minutes after the start, and the elevating range of the mouth portion 22 by the operation of the handle 28 is 1000 mm. By doing so, it is possible to suck in floating matter such as scum by manually lowering the spout even below the operating water level.

  In the embodiment described above, a scum discharge device suitable for installing in a batch-type reaction tank has been exemplified, but this scum discharge device is installed in a processing tank in which suspended matter such as scum floats on the liquid surface. can do. In addition, as an operation mechanism, the handle 28 linked to the screw rod 27 has been described as being handled by a large fluctuation in water level by manual operation. However, the handle 28 is provided with a drive device to detect the water level in the reaction tank 10. If the structure is such that the handle 28 is rotated by receiving the output signal of the device and operating the driving device, it is possible to automatically follow large fluctuations in the water level, not manually. Furthermore, although it explained as what used the bellows pipe for the expansion and contraction pipe which connected the mouth and the communication pipe, as this expansion and contraction pipe, the expansion and contraction pipe which expands and contracts by a sliding type like the communication pipe 21 of this embodiment, Or a hose etc. may be sufficient.

  The present invention is suitable for a processing tank that needs to process floating substances such as scum and dust in a processing tank having a large water level fluctuation other than a batch-type reaction tank used in a small-scale water treatment facility. In particular, it can be provided at a low cost suitable for a processing tank that requires low equipment costs, and can sufficiently discharge suspended solids.

It is a figure explaining the structure of the scum discharge apparatus concerning this invention. It is a top view of a scum discharge device in this invention, and is an AA arrow view in FIG. It is a front view of the upper pipe of the scum discharge device shown in FIG. It is a front view of the lower pipe of the scum discharge device shown in FIG. It is the front view of the connecting pipe of the scum discharge device shown in FIG. It is a top view of a batch type reaction vessel suitable for mounting the scum discharge device according to the present invention. It is a figure explaining the schematic structure of the conventional scum discharge apparatus. It is a figure explaining the schematic structure of the conventional scum discharge apparatus.

Explanation of symbols

10 batch reactor
11 Aeration equipment
12 Scum discharge device
13 Drainage device
21 Communication pipe
21a Upper pipe
21b Bottom pipe
22 Higuchi
22a Higuchi
23 bellows tube
24 float
25 Connection pipe
26 Scum pump
27 Screw rod (operating mechanism)
27a Support arm (operation arm)
28 Handle (operation unit)

Claims (2)

In the scum discharge device that sucks floating matter such as scum and oil floating on the liquid surface of the liquid to be processed stored in the processing tank together with the liquid from the spout by the scum pump, and feeds it to the scum separation device.
The float is connected to the mouth portion provided with the mouth, and the mouth is exposed to the liquid level by receiving the buoyancy.
An expansion tube is interposed between the throat portion and a communication tube that communicates the shed and the scum pump.
The communication pipe is made to be extendable and retractable as a double pipe structure composed of an upper pipe and a lower pipe, and an operation arm portion is provided on the upper pipe.
Linking an operation mechanism for operating from the outside of the processing tank to the operation arm,
Operate the operating mechanism to slide the upper tube relative to the lower tube, to change the height position of the mouth portion,
A scum discharge device, wherein the telescopic tube expands and contracts in response to a change in liquid level, and the shed follows the liquid level in the expansion and contraction range. The operating mechanism includes a screw rod formed with a male screw and connected to the operating arm, and an operating unit such as a handle or a lever having a female screw screwed to the male screw.
The scum discharge device according to claim 2, wherein the screw rod is moved up and down by the operation of the operation unit to slide the upper tube relative to the lower tube.

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