JP3814650B2 - Scatter removal device for floating scum - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floating scum scraping and removing device that efficiently removes scum generated in a sewage treatment system, and in particular, when the scum floating on the water surface is sucked by swinging a pipe scum skimmer. Accordingly, the present invention relates to a floating scum scraping and removing device that rakes the floating scum toward the skimmer side and reliably discharges the scum.
[0002]
[Prior art]
In conventional sewage treatment, sewage discharged from each household is introduced into the aeration tank of the treatment plant, stirred and aerated in this tank, and organic solids in the sewage are decomposed by aerobic treatment, and then the sedimentation basin Here, solids such as activated sludge and undecomposed organic matter are separated from water, and the supernatant water is drained out of the tank as treated water, and a part of the solids is returned to the aeration tank via the return sludge pipe. It is returned and used as activated sludge to promote the treatment of sewage in the aeration tank. However, a large amount of actinomycetes are mixed in the activated sludge returned from the sedimentation basin to the aeration tank. For this reason, even if it is effective for promoting the treatment, this large amount of actinomycetes is propagated in the aeration tank, and it is a cause of generating further scum. In addition, this scum reduces the treatment capacity of sewage and emits a foul odor and causes a problem of foul odor pollution. Therefore, a pipe scum skimmer is disposed at the water surface position of the processing tank as means for removing this scum, and the scum floating on the water surface is sucked together with a part of the sewage and discharged out of the tank.
Further, the combination of the rotary weir scum skimmer and the floating weir sucks the scum out of the tank due to the difference in water level caused by the settlement of the floating weir.
[0003]
[Problems to be solved by the invention]
In the above-described conventional apparatus for removing floating scum by the pipe scum skimmer, the pipe scum skimmer is swung in one direction in the upstream direction or in both the upstream and downstream directions so that the scum floating on the water surface can be efficiently discharged. There is. Therefore, the scum discharge opening of the pipe scum skimmer is moved up and down at the water surface position by swinging, so that the floating scum can be sucked more by using the water flow due to the water level difference. However, even though this method is effective for discharging floating scum in the vicinity of the pipe scum skimmer position, there is a problem that scum floating on the water surface away from the pipe scum skimmer cannot be discharged. Furthermore, the scum floating on the water surface condenses and grows large, and only a small amount protrudes from the water surface due to its specific gravity, and there are 50 to 100 mm submerged in the water surface. Therefore, both the pipe scum skimmer and the rotary weir type scum skimmer have a problem that the suction force is weak and the island shape is large, and it is difficult to suck the solid scum. .
The present invention solves the problems of the conventional floating scum removal device, and intermittently rotates the scum scraping rotary blade disposed on the upstream side of the skimmer in synchronization with the swinging motion of the pipe scum skimmer. It is an object of the present invention to provide a floating scum scraping and removing device capable of forcibly scraping and discharging a scum floating at a water surface position separated from a pipe scum skimmer.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the floating scum scraping and removing device of the present invention is composed of a pipe-like body, and is rotatably supported around a shaft of the pipe-like body by a rotation support tool , and swings periodically. A pipe scum skimmer, a scum scraping rotary blade adjacent to the pipe scum skimmer, and a pipe scum skimmer between the pipe scum skimmer and the scum scraping rotary blade. The scum floats on the surface of the water and is squeezed by the rotating blades by the swing of the pipe scum skimmer and discharged by the pipe scum skimmer.
[0005]
When the pipe scum skimmer swings at a predetermined angle, the floating scum scraping and removing device of the present invention having the above-described configuration is configured such that the scum scraping rotary blade disposed adjacent thereto rotates the ratchet gear mechanism. synchronously with the blade drive mechanism, yet the scum floating on the water surface so rotated as scrape the pipe scum skimmer side, at pipe scum skimmer without using a large scum other power became islands Can be sucked and discharged.
[0006]
In this case, the rotary blade driving mechanism for intermittently rotating the scum scraping rotary blade in synchronization with the swinging motion of the pipe scum skimmer includes a one-side rotary rotor provided on the scum scraping rotary blade side, and a pipe scum skimmer. And a ratchet lever which is provided so as to be able to swing and is rotated by meshing with the one-side rotary body.
[0007]
Even if the pipe scum skimmer swings at a predetermined angle, the floating scum scraping / removing device of the present invention having the above-described configuration always keeps the scum scraping rotary blade from the configuration and the tooth shape of the ratchet gear and the ratchet lever. Since the floating scum is rotated in one direction in the scraping direction, the floating scum is forcibly scraped to the pipe scum skimmer side, and the large scum floating in an island shape is reliably sucked from the pipe scum skimmer. Can be discharged [0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a floating scum scraping and removing apparatus of the present invention will be described below with reference to the drawings.
1 a pipe scum skimmer disposed in the processing tank or the processing ponds in FIG, made from the pipe-like body, as well as rotatably supported about the axis of the pipe-shaped body by the rotation support device 3, such as support rollers The pipe scum skimmer 1 is provided with a scum suction hole 11 on the outer peripheral surface thereof in the same manner as in the prior art, and the pipe scum skimmer is formed at a predetermined angle, for example, within an angle range of 60 degrees periodically or every predetermined time. It is supported so as to swing in the upstream direction or both in the vertical direction.
[0009]
The swinging force of the pipe scum skimmer 1 is performed by a swinging device attached to the pipe scum skimmer, or the movement of the sludge scraper that circulates and moves in the treatment pond without using a special drive device is used as a striker. The transmission means is transmitted via a link, a lever, and the like, and is thereby made to swing, and the swinging means is not limited. The pipe scum skimmer is adapted to discharge the collected scum out of the tank.
[0010]
A scum scraping rotary blade 2 is disposed upstream of the pipe scum skimmer 1. The scum scraping rotary blade 2 is suspended on a rotating shaft 21 supported by a bearing 25 so as to be suspended at a water surface position by a bracket 24 attached to a processing tank wall, and scum scraping rotary blade. One plate 22 or two plates 22 are protruded over almost the entire length of the rotating shaft at intervals of 180 degrees. A connecting pipe 23 is arranged in parallel with the upper part of the rotating shaft so that the rotating shaft 21 supported between the brackets facing both ends can be supported more reliably. Further, the scum scraping rotary vane plate 22 has a simple thin plate shape, or has a tip-like comb-like shape as shown in the figure and is bent into a square shape so that the floating scum is easily scraped.
[0011]
A rotary blade driving mechanism 4 is provided for intermittently rotating the scum scraping rotary blade in synchronization with the swinging motion of the pipe scum skimmer. The rotary blade drive mechanism 4 is composed of a one-side rotary rotor provided on the scum scraping rotary blade side, for example, a ratchet gear 41, and a ratchet lever 42 that protrudes and swings on the pipe scum skimmer side. The ratchet gear 41 and the ratchet lever 42 are combined into one set and arranged at either one of the left and right ends of the pipe scum skimmer, or at both ends of a long pipe scum skimmer, the pipe scum skimmer Is smoothly transmitted to the rotating blade side.
[0012]
The ratchet lever 42 is swingably supported by a bracket 43 protruding from the outer peripheral surface of the pipe scum skimmer, and a ratchet tooth 42H having a shape that meshes in only one direction is formed on the longitudinal side surface thereof. The ratchet gear 41 is toothed so as to be rotatable in one direction, and is fixed to the end of the rotating shaft 21. When the ratchet lever 42 overlaps the ratchet gear 41, the swingable ratchet lever 42 is a ratchet gear. Do not deviate from 41. This is because disks having a diameter larger than the diameter of the ratchet gear 41 are arranged on both sides of the ratchet gear 41, and a circumferential groove is formed between the opposing disks, that is, on the outer periphery of the ratchet gear 41. The ratchet lever 42 is dropped and meshed with the ratchet gear 41 by the weight of the ratchet lever 42.
[0013]
In the apparatus configured as described above, when the pipe scum skimmer swings in the circumferential direction within a predetermined angle by driving the sludge scraper, both the ratchet lever 42 projecting from the pipe scum skimmer and Swing in the linear direction. Since the ratchet lever 42 always meshes with the ratchet gear 41 by its own weight, the ratchet gear 41 is rotated by the teeth of the ratchet lever 42 when the pipe scum skimmer swings in the upstream direction. Since this ratchet gear is fixed to the rotating shaft 21 of the scum scraping rotary blade 2, the scum scraping rotary blade 2 is rotated by the rotation of the ratchet gear 41. In this rotation direction, the scum floating on the water surface is forcibly scraped toward the pipe scum skimmer side by the ratchet tooth profile as shown in FIG.
[0014]
The scum that is scraped in this manner is reliably sucked from the scum suction hole that is rotated to the water surface position or below the water surface. The scum scraping rotary blade 2 is set so as to rotate at a predetermined angle, for example, 180 degrees, for example, 180 degrees by a single rotation (swing) of the pipe scum skimmer. Therefore, the floating scum is sufficiently scraped.
[0015]
Next, when the pipe scum skimmer reverses, that is, returns, the ratchet lever moves in a direction away from the ratchet gear together with the pipe scum skimmer. However, since the ratchet gear and the ratchet tooth profile of the ratchet lever are engaged with each other only in one direction, when the ratchet lever is returned, only the ratchet lever is returned without being engaged with the ratchet gear. In this way, the scum scraping rotary blade 2 performs a one-way rotational movement by the rotation of the pipe scum skimmer.
[0016]
【The invention's effect】
According to the floating scum scraping and removing apparatus of the present invention, the pipe scum skimmer is swung at a predetermined angle so that the scum scraping rotating blade disposed adjacent thereto is a rotating blade comprising a ratchet gear mechanism. The scum that is synchronized with the drive mechanism and rotates so as to scrape the scum floating on the water surface to the pipe scum skimmer side, so that the large scum in the shape of an island has a simple configuration without using any other power. Suction skimmer can be sucked and discharged reliably.
[0017]
According to the floating scum scraping and removing device of the second aspect of the present invention, even if the pipe scum skimmer swings at a predetermined angle, the scum scraping rotary blade always floats in one direction. Since the scum is intermittently rotated in the scraping direction, the floating scum is forcibly scraped to the pipe scum skimmer side, and the large floating scum in an island shape can be reliably sucked and discharged.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of the apparatus for scraping and removing floating scum according to the present invention.
FIG. 2 is a front view of the same.
FIG. 3 is a plan view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pipe scum skimmer 11 Scum suction hole 2 Scum scraping rotary blade 21 Rotating shaft 22 Scum scraping rotary blade plate 23 Connection pipe 24 Bracket 25 Bearing 3 Rotating support 4 Rotating blade drive mechanism 41 Ratchet gear 42 Ratchet lever 42H Ratchet tooth profile 43 Bracket

Claims (2)

A pipe scum skimmer, which is composed of a pipe-like body and is rotatably supported around the axis of the pipe-like body by a rotary supporter, and which periodically swings, a scum scraping rotary blade adjacent thereto, and a pipe scum It is arranged between the skimmer and the scum scraping rotary blade, and is composed of a rotary blade drive mechanism that rotates the scum scraping rotary blade in one direction in synchronization with the swinging motion of the pipe scum skimmer and floats on the water surface. An apparatus for scraping and removing floating scum, characterized in that the scum to be scraped is scraped by a rotating blade by a swing of a pipe scum skimmer and discharged by a pipe scum skimmer.   The rotary blade drive mechanism is composed of a one-rotation rotary body provided on the scum scraping rotary blade side, and a ratchet lever provided so as to be swingable on the pipe scum skimmer and meshing with and rotating with the one-rotary rotary body. The apparatus for scraping and removing floating scum according to claim 1.

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