JP4818023B2 - Sedimentation pond - Google Patents

Description

  The present invention relates to a sedimentation basin, and more specifically, has a function of scraping sludge settled on the bottom of the pond to a sludge pit and a function of promoting sedimentation of suspended components, and is particularly applicable to sewage sedimentation treatment. Regarding possible sedimentation ponds.

Conventionally, the sedimentation accelerating plate composed of an inclined plate or an inclined tube is provided at the upper part of the sedimentation basin to promote the sedimentation of suspended components, and the bottom of the pond is provided by installing a scraper at the lower part of the sedimentation basin. In the past, the sludge that has settled on the sewage has been raked into the sludge pit (see, for example, Patent Document 1).
JP 2001-239107 A

  However, in the conventional sedimentation basin, when both the sedimentation promotion plate and the scraping machine are installed, the sedimentation promotion plate occupies the space above the sedimentation tank. However, there is a problem that the maintenance of the scraper can be performed only with the water drained from the settling tank. For this reason, in the field of sewage treatment that contains a large amount of suspended components to be settled and separated, both the sedimentation promotion plate and the scraper have not been installed in the sedimentation basin.

  Accordingly, the present invention provides a sedimentation basin that can surely carry out sludge scraping of the pond bottom while promoting sedimentation of suspended components, and can increase the treatment capacity and improve the quality of treated water. It is an object.

In order to achieve the above object, the sedimentation basin of the present invention is guided by a plurality of rotating guide members, and is arranged to circulate between a position along the bottom of the sedimentation basin and a position passing through the top of the sedimentation basin. A traction member, a plurality of plate-like bodies spanned by the plurality of traction members at regular intervals, and drive means for moving the traction member in a constant direction, the plate-like body comprising the traction member The front end portion is provided so as to be inclined rearward with respect to the advancing direction of the pulling member with respect to the base portion mounted on the member, and the base portion and the front end portion of the adjacent plate-like body are provided so as to overlap in plan view. In addition, a spacer for securing a gap between the base and the tip is provided on one of the overlapping base and tip, and the plate-like body is sludge that has settled on the bottom of the pond when passing through the bottom of the settling basin. Scraping towards the mud pit That state becomes, when passing through the upper portion of the sedimentation tank is characterized in that the state of sedimentation accelerated plate to achieve sedimentation accelerated suspension components, around at least one axis of the plurality of rotary guide member, of the rotary guide member Short-circuit prevention blades that stir the sewage in the sedimentation basin with rotation can be extended radially from the center of the rotation guide member to the outer peripheral side.

  FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a sectional view of a settling basin, FIG. 2 is an explanatory view showing the state of the upper part of the inflow side of the settling basin, and FIG. It is explanatory drawing which shows the state of a side pond bottom part.

  The sedimentation basin 11 is provided with a raw water inflow portion 12 at one end in the longitudinal direction, a treated water outflow portion 13 at the upper end of the other end, and a mud pit (a mud hopper) 14 at the bottom of the inflow portion. Is provided. In addition, an apparatus (not shown) for collecting scum floating on the water surface is provided in the middle upper part of the sedimentation basin 11.

  In the settling basin 11, a plurality of, usually a pair of endless, sprockets 15, 16, and 17, which are one of three sets of rotation guide members provided on both sides of the settling basin 11 in the width direction, are provided. A chain 18 as a pulling member is attached. Of the three sets of sprockets, two sets of sprockets 15 and 16 are arranged on the inflow side pond bottom and the outflow side pond bottom, respectively, and one set of sprockets 17 is arranged on the water surface of the inflow side upper part. . The sprocket 17 disposed at the upper part on the inflow side is connected to a motor 19 as a driving means by a driving chain 20. Accordingly, the chain 18 is guided by the sprockets 15, 16, and 17 and is driven by the motor 19 to circulate between a position along the bottom of the settling basin 11 and a position passing through the top of the settling basin 11. Further, the sprocket 16 disposed on the outflow side pond bottom is provided with a tensioning device 16a for tensioning the chain 20 when the chain 20 extends.

  A large number of plate-like bodies 21 are stretched around the outer periphery of the chain 18 at regular intervals. The plate-like body 21 has a length corresponding to the width dimension of the sedimentation basin 11, and the base portion 21 a of the plate-like body 21 is fixed to the chain 18, and the tip end portion 21 b side of the base portion 21 a is closer to the chain 18. It is provided so that it may incline toward the back with respect to the advancing direction. Further, the tip 21b is bent to one side so as to be perpendicular to the bottom of the pond when passing through the bottom of the sedimentation basin 11, and further, on the other side of the tip, a base portion where adjacent plate-like bodies 21 overlap. A spacer 21c is provided for forming a gap between the first spacer 21a and the second spacer 21a.

  When each plate-like body 21 is pulled by the chain 18 and passes through the bottom of the settling basin 11, the sludge settled on the bottom of the pond is scraped toward the mud pit 14, and when passing through the top of the settling basin 11, Similar to the conventional inclined plate and inclined tube, the base 21a and the tip 21b of the adjacent plate-like body 21 overlap with each other in a plan view while being inclined with respect to the horizontal plane, and a predetermined gap is secured by the spacer 21c. Has been. As the chain 18 guided by the sprockets 15, 16, and 17 gradually moves, the bottom of the sedimentation basin 11 exhibits a sludge scraping function equivalent to that of a conventional chain flight sludge scraping machine. In the upper part, a sedimentation promoting function equivalent to or higher than that of a conventional sedimentation promoting plate such as an inclined plate or an inclined tube is exhibited.

  In addition, as the chain 18 gradually moves, a load is applied to each plate-like body 21b, and the plate-like body 21b may be bent, but the plate-like body 21b has a base portion 21a of the adjacent plate-like body 21. Since the spacer 21c for ensuring the clearance is provided, the action of the inclined plate can be obtained between the adjacent plate-like bodies 21 and 21. Further, even when a load is applied to the plate-like body 21b due to bending of the chain 18, the spacers 21c are provided so that the plate-like bodies 21 do not collide with each other, and the load on the base portion 21a is reduced. The durability of the plate-like body 21 can be improved. Furthermore, since the plate-like body 21 can be formed of a thin plate, the cost can be reduced.

  As shown in FIG. 2, at a portion where the plate-like body 21 passes through the sprocket 17 provided at the upper part of the inflow side of the settling basin 11, at least one plate-like body 21 is exposed on the water surface. The raw water flowing into the sedimentation basin 11 from the raw water inflow portion 12 is prevented from passing directly above the plate-like body 21 toward the treated water outflow portion 13. Further, after passing through the sprocket 17, the spacer 21 c of the front plate-like body 21 and the outer surface of the base 21 a of the rear plate-like body 21 adjacent to each other come into contact with each other, so that the front plate-like body 21 and the rear plate-like body 21 are in contact. It circulates in a state where a gap is secured.

  4 and 5 show a second embodiment of the present invention, FIG. 4 is an explanatory view showing the upper part of the inflow side of the settling basin, and FIG. 5 is an explanatory view showing the bottom part of the outflow side of the settling basin. Components that are the same as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, four short-circuit prevention blades 31b extending from the sprocket center to the outer peripheral side are formed around the shaft 31a of each sprocket 31. As a result, the sewage is gently agitated with the rotation of the sprocket 31 so that the raw water flowing into the sedimentation basin 11 from the raw water inflow portion 12 does not short-circuit in the direction of the treated water outflow portion 13 as it is. This short-circuit prevention blade 31b may be provided only on either the inflow side or the outflow side of the sprocket 31.

  Moreover, the short circuit of the raw water can also be prevented by providing the baffle plate 22 orthogonal to the flow direction.

  The present invention is not limited to each of the above-described embodiments, and the spacer may be any one that can form a predetermined gap between the front plate-like body and the rear plate-like body. Is optional. Furthermore, it is possible to guide the chain in a quadrangular (trapezoidal) shape using four or more sets of sprockets, and the entire plate-like body may be disposed in water. In addition, sprockets and chains are used as a combination of a rotating guide member and an endless pulling member, but any member can be used as long as it can pull a plate-like body such as a combination of a pulley and a wire or a drum and a belt. it can. Further, it is preferable to provide a plate-like body cleaning means for injecting cleaning water toward the plate-like body exposed on the water surface in the vicinity of the position where the plate-like body is exposed on the water surface above the water surface of the settling basin. is there.

It is sectional drawing of a sedimentation basin which shows the 1st example of a form of this invention. It is explanatory drawing which similarly shows the state of the inflow side upper part of a sedimentation basin. It is explanatory drawing which similarly shows the state of the outflow side pond bottom part of a sedimentation basin. It is explanatory drawing which shows the state of the inflow side upper part of a sedimentation basin which shows the 2nd form example of this invention. It is explanatory drawing which similarly shows the state of the outflow side pond bottom part of a sedimentation basin.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Sedimentation basin, 12 ... Raw water inflow part, 13 ... Treated water outflow part, 14 ... Waste mud pit, 15, 16, 17 ... Sprocket, 18 ... Chain, 19 ... Motor, 20 ... Drive chain, 21 ... Plate shape Body, 21a ... base, 21b ... tip, 21c ... spacer, 22 ... baffle plate, 31 ... sprocket, 31a ... shaft, 31b ... short-circuit prevention wing

Claims (2)

A plurality of endless traction members, which are guided by a plurality of rotating guide members and arranged to circulate between a position along the bottom of the settling basin and a position passing through the top of the settling basin; A plurality of plate-like bodies that are stretched over and a driving means that moves the pulling member in a certain direction, and the tip of the plate-like body is a pulling member with respect to a base that is mounted on the pulling member Is provided in a state of being inclined toward the rear with respect to the traveling direction, and is provided in a state in which the base portion and the tip portion of the adjacent plate-like body overlap in a plan view, and on either one of the overlapping base portion and the tip portion, A spacer is provided to ensure a gap between the base and the tip, and when the plate passes through the bottom of the settling basin, the sludge settled on the bottom of the pond is scraped toward the drainage pit, When passing the department Sedimentation, characterized in that the state of sedimentation accelerated plate to achieve sedimentation accelerated Pollution components. Short-circuit prevention blades that stir the sewage in the settling basin as the rotation guide member rotates are radially extended from the center of the rotation guide member to the outer periphery around at least one shaft of the plurality of rotation guide members. The sedimentation basin according to claim 1, wherein

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