JP2007044584A - Scum skimmer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a scum discharge/removal capacity of a scum skimmer by enabling a smooth discharge of scum taken into a skimmer pipe to prevent a stagnation of the scum in the pipe. <P>SOLUTION: A forced discharge device 17 for scum is installed in the scum skimmer 10. The forced discharge device 17 comprises a rotator 18, such as a screw, installed inside of the skimmer pipe 11, an actuator 14, such as a motor, for rotating the rotator 18, and a transfer mechanism 19 for transferring driving force of the actuator 14 to the rotator 18. The rotator 18 is rotated to generate a forced flow in water taken into the inside of the skimmer pipe 11, and scum is led to a scum pit with the flow and discharged/removed to the outside of a pond. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scum clearance for removing scum that is installed in a sedimentation basin or the like of a sewage treatment plant and floats on the water surface.

  In general, in a sewage treatment plant, the inflowed sewage is first sent to the first sedimentation basin after sand and trash are removed in the sedimentation basin, etc., and then passed through the reaction tank, final sedimentation basin, etc., for sludge sediment removal and organic matter decomposition.・ Purified water treatment such as removal is performed, disinfection and sterilization, and then discharged into rivers.

  In this sewage treatment process, raw water such as sewage sent to the first and final sedimentation basins contains floating substances (impurities) such as fats and oils and solids. Aggregates and generates viscous suspended matter (scum) on the water surface. If this scum cannot be removed by sedimentation and flows directly into the next process along with the treated water, it will adhere to the downstream waterways and equipment and the surface will dry and solidify, making it difficult to remove and obstructing each treatment. Furthermore, it may cause deterioration of water quality and environment such as rot and bad odor. Therefore, it is necessary to dam up each sedimentation basin and remove it periodically.

  Therefore, conventionally, in a sedimentation pond or the like where scum is generated, a scum skimmer (scum removing device) is provided, and floating scum is collected, discharged out of the pond, and removed from the water surface (see Patent Document 1). ).

FIG. 5 is a plan view showing a state in which the conventional scum skimmer 60 is installed in the settling basin 50, FIG. 6 is a cross-sectional view taken along the arrow X in FIG. 5, and FIG. It is line sectional drawing. In the figure, arrow F indicates the direction of water flow, and S indicates the water surface.
This scum skimmer 60 is a pipe skimmer type scum skimmer 60 provided with a pipe-like member (skimmer pipe), and is provided on the downstream side of the settling basin 50 as shown in FIGS. The scum is dammed and discharged by the clearance pipe 61 to be cut off.

  As shown in FIGS. 5 and 6, the settling basin 50 includes a plurality of rows (three rows in the figure) of side walls 52 provided at regular intervals in a direction perpendicular to the water flow direction F, and perpendicular to the side walls 52. An end wall 53 (upstream end wall 53 is not shown) provided at each of the upstream and downstream ends of the water flow, and an upper wall 54 extending horizontally from the upper end of a part of the side wall 52 onto the water surface S; And a scum pit 55 communicating with a drainage channel (not shown).

  The side wall 52 is provided in parallel with the water flow direction F and from the bottom of the settling basin 50 to above the water surface S. The settling basin 50 includes a plurality of rows of flat surfaces by the pair of side walls 52 and end walls 53 facing each other. A rectangular channel (pond) 51 is formed. In FIG. 6, only three rows of the side walls 52 and the water channels 51 are shown, but a plurality of rows are formed in parallel in the left direction in the figure with the same configuration.

  The end walls 53 on the upstream and downstream sides of the sedimentation basin 50 are each provided with an inlet for raw water such as sewage sent from the previous process and an outlet for treated water such as supernatant water sent to the next process. Until the raw water flowing into each water channel 51 flows out from the outlet, the solid matter floating in the water is precipitated and removed.

  The scum skimmer 60 includes a substantially cylindrical skimmer pipe 61 provided across each water channel 51 in a direction orthogonal to the water flow direction F, a driving device 62 that reciprocally rotates the skimmer pipe 61 at a constant angle, and a side wall 52. It consists of the cylindrical communication pipe 65 etc. which connect between the provided water channels 51, and the clearance pipe 61 and the drive device 62 are provided for every water channel 51, respectively.

  As shown in FIG. 6, each clearance pipe 61 is attached to the communication pipe 65 so that it can rotate, the axis is substantially parallel to the water surface S of the settling basin 50, and the lower part of the outer peripheral surface sinks below the water surface S. ing. Accordingly, the inner peripheral portion of each clearance pipe 61 communicates in a substantially horizontal state from the open end 65 a that opens to the scum pit 55 via the communication pipe 65 to the other closed end (not shown). Moreover, the flow of the water surface S of each water channel 51 is interrupted | blocked by the outer peripheral surface. As shown in FIG. 5, two openings 66 having a substantially rectangular shape in plan view are formed in the longitudinal direction in the portion on the water surface S of the clearance pipe 61, and the portion where the opening 66 is formed is formed. The cross-sectional shape is substantially C-shaped with the opening 66 facing upward, as shown in an enlarged view in FIG.

  The drive device 62 is a piston / cylinder mechanism, and is fixed to a stand 63 provided on the upper surface of the upper wall 54 as shown in FIGS. 6 and 7, and extends downward at the lower end of the piston rod. A bendable connecting member 64 such as a wire is fixed. As shown in FIG. 7, the lower end of the connecting member 64 is connected to an interlocking lever 67 provided on the outer peripheral surface of the skimmer pipe 61. When the connecting member 64 is moved up and down by the drive device 62, the skimmer pipe is moved. 61 is interlocked and rotated by a certain angle in the circumferential direction (the direction of arrow L in FIG. 7).

  This conventional scum skimmer 60 is configured as described above, and the scum that has flowed on the water surface S on the water flow or the scum that has been forcibly scraped by a scraping device (not shown) is dammed by the skimmer pipe 61. It can stop and prevent the outflow to the downstream side. Furthermore, the scum that has been dammed can be discharged / removed to the outside of the pond by the clearance pipe 61 that rotates periodically.

  That is, at the time of steady operation, as shown in FIGS. 6 and 7, the opening 66 is directed upward to be above the water surface S, and the scum floating on the water surface S is blocked by the outer peripheral surface. On the other hand, at the time of discharge, the skimmer pipe 61 is rotated to sink a part of the opening 66 below the upstream water surface S where the scum is accumulated, and the scum is taken into the skimmer pipe 61 together with water near the water surface S. The taken-in scum is guided to the scum pit 55 by the flow of water in the clearance pipe 61 and discharged / removed outside the pond.

  However, the skimmer pipe 61 of the conventional scum skimmer 60 is provided substantially horizontally, and the water taken into the inside gradually lowers the water level as it flows out from the open end 65 a that opens to the scum pit 55. That is, no forced force is applied to the flow of water, and it flows naturally up to the open end 65a (hereinafter, such a flow is referred to as a natural flow). Therefore, there is a problem that the water flow is insufficient for inducing and discharging viscous scum, and the scum is not completely discharged but stays in the clearance pipe 61. In particular, in the final sedimentation basin, the viscosity of scum becomes higher due to breeding of actinomycetes, so that more scum stays without being discharged. This staying scum causes deterioration of the environment, such as decay and generation of bad odor, and if left untreated, it becomes dry and solidified, making it very difficult to remove it.

  As one method of solving these problems, a method of providing a hydrodynamic gradient with the open end 65a as a lower end in the skimmer pipe 61 is conceivable. According to this method, since the forced flow toward the open end 65a is generated in the water in the clearance pipe 61, the scum discharge capacity can be improved. However, when the number of water channels 51 is large or when the width of one water channel 51 is wide, the total distance in the lateral direction perpendicular to the water flow direction F of the connected skimmer pipes 61 (hereinafter referred to as the horizontal pulling distance) is long. Has the problem that it is difficult to create the necessary hydraulic gradient.

  As another method for solving the above problem, it is conceivable to increase the diameter of the clearance pipe 61. According to this method, the cross-sectional area of the clearance pipe 61 is increased, and the captured scum is easily dispersed and flows. Further, even when the scum is dried and solidified into a lump, the lumps interfere with each other. Without becoming clogged with the clearance pipe 61. Therefore, even when the lateral pulling distance is long and a dynamic water gradient cannot be created, scum can be discharged more smoothly. However, as the diameter of the clearance pipe 61 increases, there is a problem that manufacturing costs such as material costs and transportation costs increase, and handling during installation becomes difficult. Further, when there is a large amount of scum to be taken in, there is a possibility that the flow of scum in the clearance pipe 61 is stagnated and stays without being discharged.

JP 2002-263646 A

  The present invention has been made in view of the above-described conventional problems, and its object is to prevent scum by smoothly discharging the scum taken into the clearance pipe or the like and improve the scum discharge / removal capability of the scum clearance. It is to let you.

The invention of claim 1 comprises a skimmer pipe that is installed on the water surface and has an opening formed along the longitudinal direction on the side surface of the pipe-like member, and a drive device that rotates the skimmer pipe in the circumferential direction, The driving device rotates the gap pipe to take in scum floating on the surface of the water together with water from the opening, and discharges the scum to the outside on the flow of water in the gap pipe. In the scum skimmer, there is provided a forced discharge device for forcibly discharging the scum to the outside by generating a forced flow in the water taken into the clearance pipe.
According to a second aspect of the present invention, in the scum skimmer according to the first aspect, the forced discharge device is provided inside the skimmer pipe, and has a rotating body having a blade on an outer periphery of a central shaft, and the rotating body at the center. And a driving device that rotates about the shaft, and the rotating device is rotated by the driving device to cause a forced flow in the water taken into the clearance pipe.
According to a third aspect of the present invention, in the scum skimmer described in the second aspect, the rotating body has a screw having a spiral blade on the outer periphery of the central shaft, or a plurality of blades on the outer periphery of the central shaft. It is a propeller fixed to.
According to a fourth aspect of the present invention, in the scum skimmer according to the second or third aspect, the axis of the central axis of the rotating body is provided below the center line of the skimmer pipe.
According to a fifth aspect of the present invention, in the scum clearance according to any one of the second to fourth aspects, the clearance pipe and the rotating body are driven by the same driving device.
According to a sixth aspect of the present invention, in the scum clearance according to the fifth aspect, a clutch capable of releasing transmission of power is provided in a power transmission path of the clearance pipe and the driving device.
A seventh aspect of the present invention is a scum that is provided on a water surface and includes a bowl-shaped member having a cross-sectional box shape that is partially openable and closable. The scum floats on the water surface together with water by opening the side surface of the bowl-shaped member. In a box-type scum skimmer that takes the water into the bowl-shaped member and places it on the flow of water in the bowl-shaped member to discharge the scum to the outside, a forced flow is generated in the water taken into the bowl-shaped member. And a forced discharge device for forcibly discharging the scum to the outside.
According to an eighth aspect of the present invention, in the scum clearance according to the seventh aspect, the forced discharge device is provided in the flange-shaped member, and has a rotating body having a blade on an outer periphery of a central shaft, and the rotating body is arranged in the center. And a driving device that rotates about a shaft, and the rotating device is rotated by the driving device to cause a forced flow in the water taken into the bowl-shaped member.
The invention of claim 9 is the scum clearance according to claim 8, wherein the rotating body is a screw having spiral blades on the outer periphery of the central shaft, or a plurality of blades on the outer periphery of the central shaft. It is a propeller fixed to.
A tenth aspect of the present invention is the scum clearance according to the eighth or ninth aspect, wherein an axis of a central axis of the rotating body is provided below a central line of the bowl-shaped member. .

  According to the present invention, the forced discharge device can generate a forced flow inside the skimmer pipe or the like, so that the scum taken in can be smoothly discharged, and the scum can be prevented from staying. The scum discharge / removal ability can be improved.

  Hereinafter, an embodiment of the scum clearance (scum removing device) of the present invention will be described with reference to the drawings. In the present embodiment, the case where the scum skimmer is installed in a rectangular sedimentation basin (first sedimentation basin or final sedimentation basin) of a sewage treatment plant will be described as an example. However, the scum skimmer of the present invention has scum generated. It can also be installed in other facilities that need to be removed.

  FIG. 1 is a plan view showing a schematic configuration of a sedimentation basin 1 in which a scum skimmer 10 of the present embodiment is installed, and an arrow F pointing from the bottom to the top of the figure indicates a direction of water flow in the sedimentation basin 1 (hereinafter, this direction is indicated). Water flow direction F).

  The scum skimmer 10 of the present embodiment is a pipe skimmer type scum skimmer 10 including a pipe-like member (skimper pipe) 11 as in the conventional scum skimmer 60 shown in FIG. 5, and the skimmer pipe 11 is settled as shown in the figure. Installed so as to block the flow on the water surface in a direction perpendicular to the water flow direction F of the pond 1 (left and right direction in the figure), collecting and collecting scum floating on the water surface, and discharging it outside the sedimentation basin 1 It has become.

  However, this scum skimmer 10 is further provided with a forced discharge device, and a forced flow is generated in the water taken into the skimmer pipe 11 so that the scum can be smoothly discharged out of the pond. This is different from the scum clearance 60.

  The sedimentation basin 1 has a plurality of rows (five rows in the figure) of sidewalls provided at regular intervals in the direction orthogonal to the water flow direction F (the horizontal direction in the figure), like the sedimentation basin 50 in FIG. 2 and end walls 3 that are orthogonal to the side wall 2 and provided on the upstream and downstream sides (upper and lower sides in the figure) of the water flow, and are partitioned by the walls 2 and 3 to form a plurality of rows (see FIG. Then, four rows) of water channels (ponds) 4 are formed. Further, a scum pit 6 is provided on the side of the sedimentation basin 1 (right side of the figure), and a sludge pit 5 is provided on the pond bottom of each water channel 4 on the upstream side (lower side of the figure). .

  The sedimentation basin 1 is configured as described above, and raw water such as sewage is supplied from an inflow port (not shown) provided in an end wall 3 on the upstream side (lower side in the figure) via a dispersion plate and a current plate (not shown). A non-illustrated flow provided in the upper part of the end wall 3 on the downstream side (upper side in the figure) is supplied by being uniformly dispersed in the water channel 4 and sedimenting and removing solids floating in the raw water while flowing through the water channel 4. The supernatant water is drained from the outlet and sent to the next process.

  The sludge produced by the sedimentation of suspended solids is drawn up to the sludge pit 5 by a well-known sludge scraper (not shown) such as a chain flight type, and is drawn from there by a sludge drawing pump or the like and sent to a sludge treatment facility or the like. . Further, the scum generated on the water surface is discharged to the scum pit 6 by the scum skimmer 10 and sent to the scum treatment facility through the drainage channel.

  Similar to the conventional scum skimmer 60 shown in FIG. 5, this scum skimmer 10 is a substantially cylindrical skimmer pipe 11 provided across the water surface of each water channel 4 in a direction orthogonal to the water flow direction F (left and right in the figure). And a driving device 12 for reciprocatingly rotating the gap pipe 11 at a constant angle, and these are provided for each water channel 4 as shown in FIG. Further, as described above, the scum skimmer 10 includes a forced discharge device for causing a forced flow in the water taken into the skimmer pipe 11 and discharging the scum smoothly.

  FIG. 2 is a cross-sectional view of the gap pipe 11 of the scum gap 10 and an enlarged schematic view of the main part showing the drive device 12 and the like in a perspective view. FIG. 2 (a) shows a state when the scum is dammed up. FIG. 2B shows a state when the scum is taken in. FIG. 3 is a side view of FIG.

  As shown in FIG. 2 and FIG. 3, the clearance pipe 11 of each water channel 4 has a substantially cylindrical shape as a whole, and a plurality of openings 13 for taking scum and water into the inside are provided along the longitudinal direction. 1 (one in FIG. 1) is provided, and the cross-sectional shape of the portion where the opening 13 is formed is substantially C-shaped. As shown in FIG. 1, the clearance pipe 11 is formed on the water surface of each water channel 4 in a direction in which the axis is substantially parallel to the water surface and perpendicular to the water flow direction F, and below the outer peripheral surface as shown in FIG. A portion (substantially lower half in FIG. 2) is provided so as to sink below the water surface S. As shown in FIG. 2A, the clearance pipe 11 is submerged below the water surface S at a predetermined depth from which scum and water do not enter, with the opening 13 facing upward.

  Further, the side walls 2 sandwiched between the water channels 4 on both sides and the side walls 2 provided with the scum pits 6, that is, the four side walls 4 other than the left end in FIG. The clearance pipes 11 are connected to each other so as to be independently rotatable through bearings or the like provided in the through holes. Therefore, as shown in FIG. 1, the skimmer pipe 11 cuts off the flow on the water surface across the horizontal direction (direction orthogonal to the water flow direction F) of the settling basin 1 as a whole, and is connected to the skimmer pipe 11. The inner peripheral part of the inner peripheral portion communicates with each other in a state substantially parallel to the water surface from the open end 11a opening to the scum pit 6 on one end side (right side in the figure) to the closed end 11b on the other end side (left side in the figure). ing. The connecting portion of the clearance pipe 11 has a watertight structure by a sealing means such as packing so that the scum or the like taken in does not flow out to the outside.

  As shown in FIGS. 2 and 3, the drive device 12 that reciprocally rotates the skimmer pipe 11 at a constant angle and a drive source 14 such as a motor provided above the water surface S and a rotation device that rotates the skimmer pipe 11. And a clutch 16 that transmits the power of the drive source 14 to the rotation mechanism 15, and the clearance pipe 11 has a certain angle (a state shown in FIG. 2A and a state shown in FIG. 2B). Between them).

  The drive source 14 is a generation source of power necessary for rotating the clearance pipe 11, and in this embodiment, the motor is used as the drive source 14, and the rotation is used as power. A clutch 16 that transmits the rotation to the rotation mechanism 15 is attached to the rotation shaft of the motor 14. As shown in FIG. 3, the clutch 16 contacts and separates at a substantially central position in the axial direction to transmit rotation. It can be turned on and off. If necessary, a speed reducer or the like is attached to the motor 14 to slow down the rotation speed, thereby preventing the skimmer pipe 11 from turning suddenly or adjusting the turning angle accurately.

  The rotation mechanism 15 is a mechanism for reciprocally rotating the gap pipe 11 at a constant angle, and for example, a rack and pinion mechanism can be used. In this case, the rotating shaft of the pinion 15a is attached to the center of one end surface of the clutch 16, and the lower end of the rack 15b extending vertically and meshing with it, and the bottom of the outer peripheral surface of the skimmer pipe 11 (the lower end portion in FIG. 2 (a)). Are connected by a bendable connecting member 15c such as a wire, and the skimmer pipe 11 is rotated.

  That is, when taking in the scum, the motor 14 is rotated in the direction of arrow R with the clutch 16 in contact, the pinion 15a is rotated in the same direction, the rack 15b is raised, and the connecting portion 15c is pulled to pull the connecting portion. The pipe 11 is rotated so that a part of the opening 13 of the clearance pipe 11 is submerged under the water surface S as shown in FIG. Here, since the skimmer pipe 11 takes in the scum floating on the water surface S from the opening 13, the clearance 13 rotates so that the opening 13 faces the floating side of the scum (upstream side of the water channel 4). On the other hand, at the time of damming the scum, the clutch 16 is disengaged so that the pinion 15a can be freely rotated, and the skimmer pipe 11 is rotated by its own weight, and as shown in FIG. The part 13 is directed upward.

  When the clearance pipe 11 is rotated by a predetermined angle and the angle is maintained, the clutch 16 is disengaged when the angle is reached, and the pinion 15a is fixed. Avoid turning. In addition to the rack and pinion mechanism, for example, a wire winding mechanism may be used as the rotation mechanism 15. In this case, the outer peripheral surface of the roll that rotates by the contact of the clutch 16 and the clearance pipe 11 may be used. The outer peripheral surface bottom is connected by the connecting member 15c, and the connecting member 15c is wound up by the rotation of the roll so that the clearance pipe 11 can be rotated in the same manner as described above.

  A forced discharge device 17 for forcibly discharging the scum taken into the clearance pipe 11 to the outside of the pond is a rotating body 18 such as a screw or a propeller provided inside the clearance pipe 11 as shown in FIGS. And a driving device for rotating the rotating body 18. This driving device includes a driving source 14 that generates a rotational driving force and a transmission mechanism 19 that transmits the rotation of the driving source to the rotating body 18. In this embodiment, the driving source 14 includes the above-described skimmer pipe 11. A drive source (motor) 14 is used.

  The rotating body 18 is for rotating the shaft center around the shaft 18 to generate a forced flow in the water taken into the skimmer pipe 11, and FIGS. 2 and 3 show a screw as an example. As shown in FIGS. 2 and 3, the screw 18 has a spiral blade on the outer peripheral surface of a cylindrical central axis, and is formed so that the diameter to the outer periphery of the blade is smaller than the skimmer pipe 11. ing. The screw 18 is provided inside the skimmer pipe 11 so that its axis is substantially concentric with the axis of the skimmer pipe 11, and rotates to the water in the skimmer pipe 11 from the closed end 11b to the open end 11a. A forced flow in the direction (from left to right in FIG. 1) is generated.

  When the screw 18 is rotated at a high speed, the scum in the skimmer pipe 11 may be splashed out of the skimmer pipe 11 as a scum. Therefore, the screw 18 has a speed reducer attached to the motor 14 as described above. Thus, it is preferable to rotate at a low speed.

  The rotating body 18 may be a propeller in which a plurality of blades are arranged radially around the central axis. In this case, the length in the axial direction is shorter than that of the screw, which is necessary for low-speed rotation. Since there is a possibility that the flow velocity cannot be obtained, it is preferable to rotate at a high speed. However, in that case, in order to prevent scattering of the scum described above, it is preferable that the diameter of the propeller be reduced and provided as much as possible from below the clearance pipe 11. That is, the occurrence of splashes is suppressed as much as possible below the water or scum, and the splashes are blocked by the relatively high wall of the skimmer pipe 11 to prevent the splashes to the outside.

  Similarly, the rotating body 18 may rotate the small-diameter screw 18 at a high speed below the inner peripheral portion of the skimmer pipe 11, and even in the case of the large-diameter and low-speed rotating screw 18, the rotating body 18 may be provided below as much as possible. The scattering of the scum to the outside of the clearance pipe 11 can be suppressed.

  The transmission mechanism 19 includes a screw rotation sprocket 19a attached to the rotation shaft of the motor 14, and a drive chain 19b that transmits the rotation of the sprocket 19a to the sprocket of the screw 18. One end side of the screw 18 (see FIG. 3). The drive chain 19b is wound around the right end side) to transmit the rotation of the motor 14 to the screw 18. Further, the other end side (the left end side in FIG. 3) of the screw 18 is rotatable to a bearing 20 suspended from above the water surface S in order to keep the axis of the screw 18 horizontal and to smoothly rotate the screw 18. It is supported.

  In the state where the opening 13 faces upward, the drive chain 19b and the like are wound around the screw 18 through the opening 13 as shown in FIG. 2A, but the skimmer pipe 11 is rotated. In some cases, as shown in FIG. 2B, the drive chain 19 b or the like may contact the side surface of the skimmer pipe 11 depending on the rotation angle, the opening width of the opening 13, or the like. In that case, a notch matching the width of the drive chain 19b or the like is formed on the side surface of the skimmer pipe 11. Further, the rotation angle of the clearance pipe 11, the opening width of the opening portion 13, and the clearance pipe 11 are placed below the water surface S so that a part of the notch sinks below the water surface S and water and scum do not flow out / inflow from there. Regardless of the rotation angle of the clearance pipe 11, the notch is always above the water surface S by adjusting the depth of sinking.

Next, a specific operation of the scum skimmer 10 in the sedimentation basin 1 will be described.
As shown in FIG. 2 (a), the scum skimmer 10 is a scum that has flowed over the water surface S by riding the water flow with the opening 13 of the skimmer pipe 11 facing upward, or a scraping device (not shown). The scum forcedly squeezed by is dammed on its outer peripheral surface.

  As shown in FIG. 2 (b), this dammed scum is rotated automatically or periodically by manual operation, as shown in FIG. Take in the inside of the pipe 11. At this time, since the screw 18 also rotates due to the rotation of the motor 14, a forced flow toward the scum pit 6 (from the left to the right in FIG. 1) occurs in the water taken together with the scum, and the scum on the water surface Then, it is guided to the open end 11a on the flow and discharged to the scum pit 6. The scum is taken in while maintaining this state, and after a predetermined time has elapsed, the clearance pipe 11 is rotated to return to the original state in which the opening 13 shown in FIG.

  The rotation of the screw 18 may be stopped when the opening 13 is returned upward, but it is desirable that the screw 18 is continued for a predetermined time after that in order to reliably discharge the scum inside the clearance pipe 11. Further, the rotation of the skimmer pipe 11 may be performed simultaneously in all the water channels 4, but may be performed in order for each water channel 4 depending on the volume of the scum pit 6 and the processing capacity of the scum processing device. .

  As described above, the scum skimmer 10 according to the present embodiment can prevent the scum floating on the water surface S of the water channel 4 from flowing out downstream. Further, the skimmer pipe 11 is rotated so that the dammed scum is taken into the skimmer pipe 11 from the opening 13 together with the water near the water surface S, and the inside is placed on the flow of water and guided to the scum pit 6, It can be discharged and removed out of the sedimentation basin 1.

  Further, the scum skimmer 10 can rotate a rotating body 18 such as a screw of a forced discharge device 17 provided inside the skimmer pipe 11 to generate a forced flow toward the scum pit 6 in the taken-in water. Therefore, the scum can be smoothly guided to the scum pit 6 as compared with the case of the natural flow, the scum can be prevented from staying in the skimmer pipe 11, and the scum discharge / removal ability of the scum skimmer 10 can be improved. .

  Accordingly, even when the total length (lateral pulling distance) of the connected skimmer pipes 11 is long, such as when the number of water channels 4 is large or when the width thereof is wide, the scum is discharged by the skimmer pipes 11 having a small diameter. Therefore, the clearance pipe 11 having a smaller diameter can be used, and the manufacturing cost and the like can be reduced. In addition, in the present embodiment, since the same drive source 14 is used for the power source for rotating the rotating body 18 and the power source for rotating the skimmer pipe 11, it can be implemented with fewer resources. it can.

  The drive source 14 of the clearance pipe 11 and the drive source 14 of the forced discharge device 17 may be provided separately. In this case, the piston / cylinder mechanism or the like does not rotate to the drive source 14 of the clearance pipe 11. A drive source 14 can be used.

  Moreover, although the forced discharge apparatus 17 may be provided for every water channel 4, you may provide in one place in the closed end 11b etc., or multiple places at time intervals, and even in that case, it is compulsory to the taken-in water. Therefore, the scum discharge capability of the scum skimmer 10 can be improved. However, in this case, when the skimmer pipe 11 on which the forced discharge device 17 is not installed is rotated, the rotating body 18 installed on the other skimmer pipe 11 is rotated in conjunction with the movement.

Here, the forced discharge device 17 of the present embodiment can be applied to other types of scum skimmers 10 other than the pipe skimmer type described above, for example, a box-type scum skimmer 10.
4 is a cross-sectional view of the box-shaped scum skimmer 10 as viewed from the longitudinal direction. FIG. 4 (a) shows a state when the scum is dammed, and FIG. 4 (b) shows a state when the scum is taken in. Show.

  As shown in the figure, this scum skimmer 10 is different from the pipe-shaped skimmer pipe 11 in that it has a box-shaped (groove-shaped) member (hereinafter referred to as a hook-shaped member 30) having a box-like cross section with an open upper surface. Instead of the pipe 11, a bowl-shaped member 30 is installed at the same position of the sedimentation basin 1. That is, the bowl-shaped member 30 is installed in a direction perpendicular to the water flow direction F of the settling basin 1 so that the upper part sinks below the water surface S and the lower part (substantially lower half in the figure) sinks below the water surface S. Yes.

  Further, an opening 32 extending from the upper end to below the water surface S is formed on the side surface 31 on the upstream side (left side in the drawing) of the bowl-shaped member 30, and the opening / closing door 33 extends to the upper portion of the water surface S in the opening 32. However, it is connected via the connecting member 34 so that it can be opened and closed, and the groove 35 of the bowl-shaped member 30 has a watertight structure.

  In this scum skimmer 10, the opening / closing door 33 of the bowl-shaped member 30 is rotated around the connecting member 34 at the lower end thereof by a driving means (not shown) to open and close a part of the side surface 31 to remove the scum on the water surface S. Is supposed to do. That is, the scum skimmer 10 closes the open / close door 33 during normal operation (see FIG. 4A), blocks the scum flowing on the water surface S, and periodically opens the open / close door 33 (see FIG. 4B). ) The scum is taken into the groove 35 of the bowl-shaped member 30 from the opening 32 together with the water in the vicinity of the water surface S, and the scum is guided to a scum pit (not shown) through the flow of water, and discharged / removed outside the settling basin 1 Do.

  However, since this bowl-shaped member 30 is provided substantially parallel to the water surface, as in the case of the above-described clearance pipe 11, the flow of water is insufficient and the scum may stay in the groove 35. In order to prevent this, it is effective to provide the scum skimmer 10 with the above-described forced discharge device 17 and forcibly discharge the scum out of the pond. That is, by providing the forcible discharge device 17, as shown in FIG. 4B, a forced flow can be generated in the water taken in by the rotation of the rotating body 18 installed in the groove 35. For this reason, the scum can be smoothly discharged in the flow and stay in the groove 35 can be prevented.

  The forced discharge device 17 may have substantially the same configuration as the forced discharge device 17 described above. However, in such a box-type scum skimmer 10, the opening / closing door 33 is mainly opened and closed. In many cases, the drive source 14 of the forced ejection device 17 needs to be provided separately because the drive source is not rotated, such as a mechanism.

It is a top view which shows schematic structure of the sedimentation basin in which the scum clearance of this embodiment was installed. It is the principal part expansion schematic diagram which showed the clearance pipe of scum skimmer by sectional drawing, and showed the drive device etc. with the perspective view. FIG. 3 is a side view of FIG. 2 showing a clearance pipe as seen through. It is sectional drawing seen from the longitudinal direction of the box-shaped scum skimmer. It is a top view which shows the state which installed the conventional scum skimmer in the sedimentation basin. FIG. 6 is a cross-sectional view taken along arrow X in FIG. 5. FIG. 6 is a cross-sectional view taken along line YY in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Sedimentation basin, 2 ... Side wall, 3 ... End wall, 4 ... Water channel, 5 ... Sludge pit, 6 ... Scum pit, 10 ... Scum clearance, 11 ... Clearance Pipe, 11a ... Open end, 11b ... Closed end, 12 ... Drive device, 13 ... Opening, 14 ... Drive source, 15 ... Turning mechanism, 15a ... Pinion 15b ... rack, 15c ... connecting member, 16 ... clutch, 17 ... forced discharge device, 18 ... rotor, 19 ... transmission mechanism, 19a ... sprocket, 19b · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ··· In the groove.

Claims (10)

A skimmer pipe installed on the water surface and having an opening formed along the longitudinal direction on the side surface of the pipe-shaped member;
A driving device for rotating the clearance pipe in the circumferential direction;
The driving device rotates the gap pipe to take in scum floating on the surface of the water together with water from the opening, and discharges the scum to the outside on the flow of water in the gap pipe. In scum skimmer,
A scum skimmer comprising a forced discharge device that forcibly discharges scum to the outside by generating a forced flow in the water taken into the clearance pipe. In the scum skimmer according to claim 1,
The forced discharge device is provided inside the clearance pipe, and a rotating body having blades on the outer periphery of the central axis;
A driving device for rotating the rotating body around the central axis;
A scum skimmer, wherein the rotating device is rotated by the driving device to cause a forced flow in the water taken into the skimmer pipe. In the scum skimmer according to claim 2,
The scum skimmer characterized in that the rotating body is a screw having spiral blades on the outer periphery of the central shaft or a propeller having a plurality of blades fixed radially on the outer periphery of the central shaft. In the scum clearance according to claim 2 or 3,
The scum skimmer characterized in that an axis of a central axis of the rotating body is provided below a center line of the skimmer pipe. In the scum clearance according to any one of claims 2 to 4,
The scum clearance is characterized in that the clearance pipe and the rotating body are driven by the same driving device. In the scum skimmer according to claim 5,
A scum skimmer, wherein a clutch capable of releasing power transmission is provided in a power transmission path between the clearance pipe and the driving device. Provided with a bowl-shaped member that is installed on the surface of the water and has a box-shaped cross section that can be partially opened and closed,
In a box-type scum skimmer that opens the side surface of the bowl-shaped member, takes in the scum floating on the water surface together with water into the bowl-shaped member, and discharges the scum to the outside on the flow of water in the bowl-shaped member ,
A scum skimmer comprising a forced discharge device for forcibly discharging scum to the outside by causing a forced flow in the water taken into the bowl-shaped member. In the scum skimmer according to claim 7,
The forced discharge device is provided in the bowl-shaped member, and has a rotating body having a blade on the outer periphery of the central axis;
A driving device for rotating the rotating body around the central axis;
A scum skimmer characterized in that the rotating body is rotated by the driving device to cause a forced flow in the water taken into the bowl-shaped member. In the scum skimmer according to claim 8,
The scum skimmer characterized in that the rotating body is a screw having spiral blades on the outer periphery of the central shaft or a propeller having a plurality of blades fixed radially on the outer periphery of the central shaft. In the scum clearance according to claim 8 or 9,
The scum skimmer characterized in that the axis of the central axis of the rotating body is provided below the center line of the bowl-shaped member.

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