JPH10230103A - Treating pond - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a treating pond have a high treating capacity even with a narrow space by a method wherein a treating tank is made in a plurality of vertical stories for a treating pond such as a circular sedimentation pond, an oxidation ditch, etc. SOLUTION: Each treating tank 1 being a vertical three-story is equipped with a downward narrousing shaped reversed circular cone sludge focusing guide surface 2, and its upper side becomes a cylindrical pond peripheral wall 3. Sewage water flows in as shown by the arrow A into a treating tank 1 of each story. A sludge induction pipe 5 is disposed in upright at a center of the treating tank 1 on a middle story and a lowest story, each lower end becomes a sludge inlet 6, the sludge flowing down along the sludge focusing guide surface 2 is induced as shown by the arrow B and the arrow C, the sludge flowing down from the treating tank on the lowest story is induced as shown by the arrow D, and extracted upward via a pump 7. Besides, a scum staying on a water surface 8 is induced near to an outer periphery being scraped together with a scraper 10, flows into a scum collecting box 17, and is pumped up as shown by the arrow E. Supernatant is recovered through a supernatant recovery pipe 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a treatment pond such as a sedimentation pond or an oxidation ditch.

[0002]

2. Description of the Related Art In general, a circular sedimentation basin, an oxidation ditch, and the like have a first floor tank.

[0003]

In the case of such a first-floor tank system, a large space is required if a large number of these tanks are installed, and many problems remain because the land is narrow.

[0004] The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a processing pond capable of having a high processing capacity even in a small space.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 is a treatment pond such as a circular sedimentation basin and an oxidation ditch, wherein the treatment tank has a plurality of floors vertically. .

According to a second aspect of the present invention, in the first aspect, the processing tank is at least three floors.

[0007] The invention described in claim 3 is claim 1 or 2.
, The sludge guide pipe is directed to a circular sedimentation basin, and a sludge guide pipe is disposed vertically in the center of the treatment tank in at least the second floor tank, and each sludge guide pipe is provided with the same pipe. Sludge from the processing tank above the processing tank is received, and the sludge is guided to the next processing tank below.

According to a fourth aspect of the present invention, in the third aspect, the lower portion of the processing tank has a downwardly conical shape, and the inclination angle with respect to the horizontal line of the cone is 45 degrees or more.

The invention according to claim 5 is the invention according to claim 3 or 4.
The scraper provided near the water surface of the treatment tank, which removes what floats on the water surface of the treatment tank by rotational movement, is guided at both ends by guide rails on the inner periphery of the treatment tank via the outer periphery of the sludge guide pipe. It is supposed to be.

According to a sixth aspect of the present invention, in any one of the third to fifth aspects, a pipe with an inflow port is provided along the inner periphery of the treatment tank as a means for extracting supernatant water below the water surface. .

The invention according to claim 7 is directed to claim 3, wherein the scum floating on the water surface of the lower processing tank is provided on the lower surface of the bottom wall of the upper processing tank. It is guided outwardly along the conical surface and is eliminated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. 1 and 2 show a preferred embodiment thereof, FIG. 1 is a schematic longitudinal sectional view of a circular sedimentation basin, and FIG. 2 is a view taken along line II-II in FIG.

In FIG. 1, reference numerals 1... Denote treatment tanks. Each treatment tank 1 is provided with an inverted conical sludge collecting guide surface 2 having a constricted shape as shown by an inclined line rising at 60 degrees with respect to a horizontal plane. The upper part is a cylindrical pond peripheral wall 3. These processing tanks 1 are three stories up and down and are made of metal or concrete. In a rocky area, a hole is formed vertically, concrete is applied along the inner surface of the hole, and a treatment tank is formed together with the internal paste.

The reason why the angle is set to 60 degrees is that the angle of the sludge naturally flows down due to the nature of the sludge. The angle may be 45 degrees or more depending on the nature of the sludge. The guide surface 2 may be provided with a rotating rake at a generally gentle angle. On the other hand, the angle may be set to be small, and the sewage 4 may be swirled to promote the sludge flow. As shown in FIG. 1, this swirling flow is provided with an umbrella-shaped diffusion plate 23 at the upper end of a vertical pipe 22 erected at the center in the processing tank 1 on the top floor. A spiral generating blade having a spiral shape may be provided. Also,
The swirling flow may be caused by inclining the inflow direction of the sewage.

The height of the ground can be appropriately set between the upper end of the uppermost processing tank 1 and the lower end of the lowermost processing tank 1. Sewage flows into the treatment tanks 1 of these floors as indicated by arrows A. At the center of the middle and lowermost treatment tanks 1, a sludge guide pipe 5 having a cylindrical shape is erected, and the middle sludge guide pipe 5 communicates with the lower end of the treatment tank 1 on the top floor. The sludge guiding pipe 5 on the floor communicates with the lower end of the middle processing tank 1.

The lower end of each sludge guide pipe 5 is separated from the lower end of the corresponding treatment tank 1 and forms a sludge inlet 6, through which the sludge flowing down along the sludge collection guide surface 2 is indicated by an arrow B. Then, the inside of the sludge guide pipe 5 is guided vertically as indicated by an arrow C. The sludge flowing down from the sludge guide pipe 5 and the sludge collection guide surface 2 of the processing tank 1 on the lowest floor is
It is guided as indicated by an arrow D, and is drawn upward through an air lift type pump 7. In addition, you may make it extract sludge from each floor.

On the other hand, scum stays on the water surface 8, and the scum is guided toward the outer periphery while being scraped by the scraper 10 rotating in the processing tank 1. As shown in FIG. 2, the scraper 10 is formed so as to be curved rearward and downward in the outer diameter direction through a center well 11 at the center, and a plurality of rollers provided at both ends of the scraper 10 via brackets 12 are provided. 13 roll on guide rails 14 provided along the inner periphery of the processing tank 1. At one end of the scraper 10, a motor 15 with a speed reducer for driving the roller 13 is provided. The guide rail 14 is fixed by a receiving bracket 16.

The scum attracted to the outer periphery as described above flows into a scum collection box 17 arranged on the outer periphery of the processing tank 1 and is pumped up as shown by an arrow E.
The inner peripheral side of the box 17 may be opened lower than the water surface 8, and a weir may be provided at the opening so as to move up and down by the scraper 10. The center well 11
Serves as an inlet for sewage and suppresses the diffusion of sewage. still,
The center well 11 may be fixedly provided on the sludge guide pipe 5 side.

Reference numeral 19 denotes a supernatant water recovery pipe.
Has a plurality of holes 20 in the circumferential direction, as shown in FIG. This pipe 20
Are supported by the pipe bracket 21.

The supernatant water recovery pipe 19 itself may be used as a guide rail. Further, as shown by the imaginary line in FIG.
If the sludge is caused to flow along the sludge collection guide surface 2 after the sludge is received and caused to flow down at the tip of the sludge 5, the sludge that is going to accumulate on the sludge collection guide surface 2 can flow down.

As shown by the imaginary line in FIG. 1, a hanging member 26 such as a link chain or a wire rope is lowered from the scraper 10 and a downflow promoting piece 27... In preparation, sludge can be made to flow down positively. Flow promotion piece 27 ...
May be arranged on a single suspending member 26 extending above and below the guide surface 2 so as to extend over and below the sludge collection guide surface 2. Alternatively, the suspending member 26 may be formed in a strip shape. Alternatively, the upper end thereof may be rotatably attached to the scraper 10 so that the belt moves along the vertical direction of the guide surface 2 so that the sludge on the guide surface 2 travels together with the scraper 10 while scraping. Further, FIG.
At the lower end of the sludge guiding pipe 5, a blade 28 rotating with sludge is provided at the lower end of the sludge guiding pipe 5, and a sludge scraping plate 29 is provided on the blade 28 so that the sludge on the sludge collection guide surface 2 is scraped off. It can also be configured. When the sludge is directed obliquely from the top and slanted with respect to the normal line of the sludge collection guide surface 2, the sludge flows smoothly and reliably.

In FIG. 1, a stay may be provided vertically from the scraper 10, and a rake for scraping off the sludge on the sludge collection guide surface 2 may be attached to the lower end of the stay. Also,
The scraper 10 is provided with a bearing on the outer periphery of the vertical pipe 22 extending upward from FIG. 1, and is further provided with a bearing on the outer periphery of each sludge guide pipe 5 so as to be supported horizontally rotatably. The scraper 10 is provided on the outer periphery. The motor may be driven by engaging a pinion with the ring-shaped gear. In this case, the motor can be fixed to the outer peripheral side of the vertical pipe 22 or the sludge guide pipe 5, and the ring gear on the side of the scraper 10 can be rotated by a pinion provided on the output shaft to drive the scraper 10 to rotate. A baffle may be provided inside the supernatant water recovery pipe 19. In addition, the bottom wall of the rectangular sedimentation basin is gently lowered and inclined to one side, and a pit for storing sludge is formed in a concave shape at the end in the downward inclination direction, and the sludge that has been dropped is extracted by pumping up. It is like that. In this case, the processing tank 1 of the embodiment shown in FIG. 1 may be installed in one or more floors in the pit. In addition, the pit and most of the other parts are separated by a partition plate, and the treatment tank 1 is installed in the internal space on the pit side, and sewage is sent to both the inside and the outside of the treatment tank 1. Is also good. In this case, the scraper only needs to be provided at a position corresponding to the uppermost processing tank 1. This scraper is
The scraper may reciprocate along the water surface at the upper end of the space in the partition plate, and the scum accumulated on the water surface may be removed to the outside by the scraper. The processing tank 1 may have a conical shape or a quadrangular pyramid shape. Further, in the above description, the processing tanks 1 are arranged in the pits. However, the processing tanks 1 may be appropriately arranged at locations outside the pits in the settling basin. In this case, a processing tank may be provided in the pit.
In each of the above embodiments, in order to stop the flow of the inflowing sewage at an early stage, a suspension type or rising type obstacle member, for example, a branching member or a rectifying member with holes may be provided. In the embodiment of FIG. 1, the uppermost processing tank 1 is a first settling tank, the middle processing tank 1 is a final settling tank, and the lowermost processing tank 1 is a concentration tank.
An aeration tank (or aeration tank) is arranged between the second and third stages from the top, an aeration tank (or an aeration tank) is arranged in place of the concentration tank, and aeration is performed at the lower third stage from the top. Tank (or aeration tank)
May be distributed. In the above embodiment, the upper and lower scrapers 10 are independently driven. However, for example, the uppermost or middle scraper 10 is rotationally driven and its driving force is used for driving the other stages of the scrapers 10. You may. That is, the driven scraper 10 and the driven scraper 10 are connected by a transmission means (a link chain, a chain, or the like).

FIG. 3 shows another embodiment of the supernatant water recovery pipe. The recovery pipe 30 is a square (or another shape such as a round shape), and a recovery hole 31 is opened at the upper part. The hole 31 is provided with a valve 32 that opens and closes due to fluctuations in the water level. The valve 32 has a triangular cross section, but may have a round shape like an imaginary line. A baffle 33 may be provided on the inner peripheral side of the pipe 30. Also, the valve 32
Constitutes a guide for ensuring vertical movement.

FIG. 4 shows an H-shaped guide rail 35 in which a plurality of rollers 36 are allowed to roll freely to guide a scraper 37 in rotation.

FIG. 5 shows a circular sedimentation basin of a third-floor tank, in which the bottom walls 37 are formed gently at about 15 degrees, and in particular, the bottom wall 37 is a scum guide wall of the lower-floor tank. Is also configured. A scum guide wall 38 is also provided above the first floor tank. The sewage is introduced as indicated by arrow A and separates sludge downward and scum upward while suppressing diffusion in the center well 39. Note that a buffer board 40 may be arranged in the center well 39 like an imaginary line. In this case, a sponge or the like is attached to the upper surface of the buffer board 40 in particular. Such a buffer may be arranged in several stages.

The sludge is moved from the sludge collection guide surface 48 by an arrow B
As shown by arrow G, through the sludge removal pipe 44 which is guided into the sludge pit 42 at the lower end through the central sludge guide pipe 41 and penetrates through the sludge guide pipe 41 via the air lift pump 43 from the pit 42. It is extracted to. As shown in FIG. 1, it may be extracted through the outside of the processing tank 45. Since the angle of the bottom wall 37 is gentle, a conventional rake may be configured. However, in the case of this embodiment, a step 46 is formed on the bottom wall 37 to form the water injection devices 47. As shown by arrow H, the sludge is encouraged to flow down. Of course, the inclination angle of the bottom wall may be around 60 degrees as shown in FIG. 1, and in this case, the water injection device is unnecessary.

On the other hand, the floating scum is naturally guided in the outer radial direction along the bottom surface since the bottom wall 37 and the scum guide wall 38 are conical. Then, it is guided into the scum box 49 and pumped up from the scum pit 50 by the pump 51 to be removed. 52 is a water surface, and 53 is a supernatant water recovery pipe having a hole.

It should be noted that the scum box 49 may be provided with an up-and-down weir to collect scum periodically. Further, as shown in FIG. 6, a scum collecting pipe 55 may be provided on the water surface 52 to remove the scum using the buoyancy of the scum.

Further, as shown in FIG. 7, a scraper 57 which rakes the scum floating on the water surface 52 while circling the scum.
The scraper 57 is provided with an outer peripheral rack 61 via a pinion 60 to a motor 59 provided on the outer periphery of the processing tank 58.
Orbital movement may be performed along.

Separately, as shown in the figure, a center well 63 having a truncated cylindrical shape is provided.
The scum may be raised by directing the sewage into the inside of the well and hitting the buffer plate 64, while the sludge may flow down along the outer peripheral surface of the well 63. The method using the center well 63 can be adopted also in the embodiments shown in FIGS. 5 and 6
In the embodiment shown in (1), the introduction of sewage may be partially or wholly directed toward the bottom wall to promote the rise of scum.

In this embodiment, the inclination angle of the bottom wall 65 is 30 °, but the angle can be freely selected. FIG. 8 relates to a treatment pond installed diagonally on a mountain such as a bedrock. A treatment tank 70 of the treatment pond is formed by connecting concrete cylinders up and down. And it is received by the bottom cylinder 71. Although the processing tank 70 is set at 60 ° with respect to the horizontal plane, the angle may be set to be loose or set at 70 to 90 °. The processing tank 70 may have a square cross section.

The upper end of the processing tank 70 is open but may be provided with a lid. Inside the processing tank 70, vertical plane partitioning plates 73 are arranged apart from each other, and the partitioning plates 73 are arranged so as to be vertically open with respect to the processing tank 70. When the sewage is supplied as shown by the arrow I, the scum floats up as shown by the arrow J through the upper gap 74, and the sludge flows down as shown by the arrow K through the lower gap 75. The floating scum is appropriately removed by a discharging means such as a conveyor 76, and the sludge is extracted upward as indicated by an arrow L. The conveyor 76 may be a screw or a rotating scraping plate type.

FIG. 9 shows the oxidation ditch 78. The oxidation ditch 78 is a tank on the third floor. Of course, it may be a tank on the second floor or a tank on the fourth floor or more. Also, 79 may be a sewage introduction path to which air 80 is simultaneously supplied. Reference numeral 81 denotes a supernatant water discharge passage, and sludge discharge means is not shown in the figure.

[0034]

As described above, the present invention provides a circular sedimentation basin,
Since it is a treatment pond such as an oxidation ditch, and the treatment tank is characterized by having multiple floors up and down,
It is possible to provide a processing pond that can have a high processing capacity even in a small space.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a circular sedimentation pond according to an embodiment of the present invention.

FIG. 2 is a view taken along line II-II in FIG.

FIG. 3 is a schematic longitudinal sectional view showing another embodiment of the supernatant water discharging means.

FIG. 4 is a schematic longitudinal sectional view showing another embodiment of the rotation support structure of the scraper.

FIG. 5 is a schematic longitudinal sectional view showing another embodiment of the circular sedimentation basin.

FIG. 6 is a schematic longitudinal sectional view showing another embodiment of the scum discharging means.

FIG. 7 is a schematic longitudinal sectional view showing another embodiment of the circular sedimentation basin.

FIG. 8 is a longitudinal sectional view showing an embodiment of another treatment pond.

FIG. 9 is an external view showing an embodiment of an oxidation ditch.

[Explanation of symbols]

 1,45,70 ... Treatment tank

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 3/14 ZAB C02F 3/14 ZAB

Claims (7)

[Claims] 1. A treatment pond such as a circular sedimentation pond or an oxidation ditch, wherein the treatment tank has a plurality of floors vertically. 2. The treatment pond according to claim 1, wherein the treatment tank is at least three floors. 3. The sludge basin according to claim 1 or 2, wherein a vertical sludge guide pipe is disposed at the center of the treatment tank in at least the second floor tank or lower.
Each sludge guide pipe is a treatment pond adapted to receive sludge from a treatment tank above the treatment tank in which the pipe is provided and guide the sludge to the next lower treatment tank. 4. The treatment pond according to claim 3, wherein the lower part of the treatment tank has a conical shape tapered downward, and an inclination angle with respect to a horizontal line of the cone is 45 degrees or more. 5. The scraper according to claim 3, wherein the scraper is provided near the water surface of the treatment tank and removes a substance floating on the water surface of the treatment tank by a rotary motion via an outer periphery of the sludge guide pipe. Is guided by a guide rail on the inner circumference of the processing tank. 6. The treatment pond according to claim 3, wherein a pipe with an inlet is provided along an inner periphery of the treatment tank as a means for extracting supernatant water below the water surface. 7. The scum floating on the water surface of the lower processing tank according to claim 3, wherein the scum floating on the water surface of the lower processing tank is formed along the conical surface on the lower surface of the bottom wall of the upper processing tank. A treatment pond that is guided and directed away.