JP4271389B2 - Scumskimma - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scum skimmer, and in particular, in a circular processing tank in which a feed well is disposed in the center, scum floating on the water surface in both the feed well and the processing tank can be efficiently discharged with a simple device. It is about scum skimmers that can do.
[0002]
[Prior art]
Conventionally, in sewage treatment, a scum gap is tiltably disposed at the water surface position in the treatment tank, and the scum floating on the water surface is discharged out of the treatment tank. In particular, in a circular processing tank in which a feed well is provided in the central part, a scum gap is arranged to be tiltable from the feed well in the central part of the processing tank to the outer periphery of the processing tank, and is divided by the feed well. The scum floating on the water surface inside the treatment tank outside the feed well is sucked together in the same scum skimmer, and discharged through the scum skimmer.
[0003]
[Problems to be solved by the invention]
By the way, in the conventional tilting type scum skimmer, the scum suction port for sucking and discharging the floating scum is provided on the outer peripheral surface of the cylindrical scum skimmer, and on the same surface on both the feed well side and the processing tank side. Since the scum clearance is tilted and the scum floating on the water surface is sucked and discharged, the suction scum amount on the treatment tank side is larger than that on the feed well side. This suction scum is divided into the discharge side on the outer peripheral side of the processing tank and the feed well side in the central part of the processing tank in the scum gap, and there is a problem that the scum in the feed well is not discharged at all. .
In order to solve this problem, it may be possible to arrange independent scum skimmers in the feed well and in the treatment tank, so that the scum can be discharged efficiently. However, in this two scum skimmer system, There is a problem that the apparatus becomes complicated and expensive.
[0004]
In view of the above-mentioned problems of the conventional scum skimmer, the present invention reliably sucks even the scum floating on the water surface into the feed well with a simple device even in a circular processing tank in which the feed well is arranged in the center. An object of the present invention is to provide a scum clearance that can be discharged.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the scum skimmer according to the present invention is a scum skimmer that is arranged so as to be tiltable so as to draw in and discharge floating scum, between a processing tank and a feed well disposed in the processing tank. The discharge path of each scum is formed separately in the scum gap so that the scum floating inside and the scum floating inside the processing tank are individually sucked and discharged.
[0006]
In this invention, since the scum floating in the feed well and the scum floating in the processing tank are individually sucked and discharged, the amount of scum floating in the processing tank can be reduced with a simple configuration. Even if the amount of scum is extremely larger than the amount of scum in the feed well, the scum floating in the feed well can be individually sucked and discharged reliably.
[0007]
Since the scum sucked from the feed well and the scum sucked from the processing tank are separately discharged from the discharge path formed individually, the scum floats in the feed well and the processing tank. Even if the amount of scum varies, it can be discharged reliably.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the scum clearance according to the present invention will be described with reference to the drawings.
[0009]
In FIGS. 1-2, showing a reference example of the scan Kamusukima.
In the figure, reference numeral 1 denotes a processing tank such as a sedimentation tank or an aeration tank disposed in a sewage treatment plant or the like. The processing tank 1 is formed in a circular shape, and a feed well 2 is disposed in the center thereof. A scum gap 3 is disposed at the water level of the treatment tank so that the treatment tank 1 crosses at least the outer periphery of the treatment tank from the feed well 2.
The scum skimmer 3 supports the lower position of the scum skimmer 3 by a plurality of rolling wheels 33 and 33 so that the scum skimmer 3 tilts in one direction or both left and right directions at a predetermined angle. Tilt downward from the standby position of the position, and when the water surface position is reached, the scum floating on the water surface can be sucked.
[0010]
Further, the scum skimmer 3 protrudes from the processing tank side end portion to the outside of the processing tank, and is connected to the discharge trough 4 disposed outside the processing tank, so that the scum sucked into the scum skimmer 3 is surely contained in the processing tank 1. A scum suction port 31 for sucking scum floating on the water surface 21 in the feed well and a scum suction port 32 for sucking scum floating on the water surface 11 in the treatment tank are provided on the outer peripheral surface of the scum skimmer 3. Are individually formed.
[0011]
Then, the scum suction port 31 and the scum suction port 32 are formed by shifting the opening positions along the outer peripheral direction of the scum skimmer 3. For example, as shown in FIG. 2, the angle θ1 formed between the opening edge of the scum suction port 31 in the standby state of the scum skimmer 3 and the horizontal line passing through the center of the scum skimmer 3 or the water surface, and the opening edge of the scum suction port 32 In relation to the angle θ2 between the horizontal line passing through the center of the scum skimmer 3 or the water surface, the angle difference is formed so that θ2> θ1. The opening width is not particularly limited, but may be the same width.
As a result, when the scum skimmer 3 tilts in the direction of sucking the scum floating on the water surface from the standby state, the time required for the scum suction port 31 and the scum suction port 32 to reach the water surface position can be differentiated.
By forming an angular difference between the scum suction ports 31 and 32 in this way, when the scum suction ports 31 and 32 reach the water surface position, a time lag occurs, and the scum floating on the feed well inner water surface 21 is firstly formed. Then, the scum floating on the water surface 11 in the treatment tank is sucked.
[0012]
Therefore, regardless of the amount of scum that floats on the water surface, the scum that floats on the water surface 21 in the feed well is first sucked and discharged, and the scum that floats on the water surface 21 in the feed well is also reliably discharged. It will be a thing.
Further, even if the amount of scum floating on the water surface 11 in the treatment tank is large, even if the sucked scum is divided into the treatment tank outer peripheral side and the central part and flows in the scum skimmer as in the prior art, the amount is very small. Thus, at the time of the next scum suction, the scum that flows to the feed well side in the center is also discharged out of the processing tank together with the scum suction on the water surface in the feed well.
[0013]
Next, the operation of this scum clearance will be described.
When supplying sewage into the treatment tank and performing aeration treatment or aeration and anaerobic treatment, the scum floating at the treatment tank water surface position tilts the scum skimmer 3 periodically or when a required amount of scum floats. The scum inlets 31, 32 are moved from the position above the water surface to the water surface position. At this time, since the scum suction ports 31 and 32 are formed at different positions, the scum floating on the water surface 21 in the feed well is first sucked from the scum suction port 31 that reaches the water surface first, and the inside of the scum clearance is processed. It flows down to the outside of the tank and is discharged.
Further, when the scum skimmer 3 tilts to a preset angle, the scum suction port 32 that reaches the water surface position following the scum suction port 31 sucks the scum floating on the water surface 11 in the processing tank, and passes through the scum skimmer. It is discharged into the discharge trough 4 outside the tank.
[0014]
In this case, there is a difference in suction time between the scum floating on the water surface in the feed well and the scum floating on the water surface in the treatment tank. It will be discharged out of the tank.
[0015]
3 to 4 show an embodiment of the scum clearance according to the present invention.
The scum suction ports 31, 32 in the scum skimmer 3 of this embodiment are arranged adjacent to each other in a straight line without providing an angle in the circumferential direction of the scum skimmer 3, and in the scum skimmer 3, The scum sucked independently from the scum suction port 32 is separated from each other, and the partition plates 34 and 35 are disposed so as to flow down in the scum skimmer, thereby forming the flow paths 3A and 3B.
[0016]
The partition plate 34 separates the scum sucked from the two scum suction ports 31 and the scum suction port 32, and is arranged in a ring shape in a direction intersecting with the axis of the scum skimmer 3. In the scum skimmer, two independent upper and lower flow passages are formed. The scum skimmer is arranged along the axial direction of the scum skimmer 3 and is separated into the scum skimmer by the partition plates 34 and 35. Two distribution channels 3A and 3B having a stepped shape are formed so as to communicate with the discharge trough 4 outside the processing tank.
In this case, the scum amount sucked from the scum suction port 31 is different from the scum amount sucked from the scum suction port 32. For this reason, since the amount of scum sucked from the water surface in the precipitation tank having a large area through the scum suction port 32 is large, the volume of the upper flow path 3B is set to be larger than the volume of the flow path 3A.
[0017]
Next, the operation of the scum clearance of this embodiment will be described.
By tilting the scum skimmer 3 disposed in the treatment tank, the scum floating on the water surface 21 in the feed well is sucked from the scum suction port 31, and this scum passes through the lower flow path 3A to the discharge trough 4. In addition, the scum floating on the water surface 11 in the treatment tank is sucked from the scum suction port 32 and individually flows to the discharge trough 4 through the upper flow path 3B. For this reason, even if the scum floating on the water surface in the feed well and the scum floating on the water surface in the treatment tank are sucked at the same time, or even if the amount of scum floating on the water surface in the treatment tank is large, the scum is reliably discharged out of the treatment tank. Will be.
[0018]
In this case, since the amount of scum floating on the water surface 21 in the feed well is different from the amount of scum floating on the water surface 11 in the treatment tank, the area of the cross-sectional shape of the flow paths 3A and 3B is set in advance to the amount of scum to flow. It shall be configured as appropriate.
[0019]
【The invention's effect】
According to the scum skimmer of the present invention, since the scum floating in the feed well and the scum floating in the treatment tank are individually sucked and discharged, the scum floats in the treatment tank with a simple configuration. Even if the amount is large, the scum floating in the feed well can be surely sucked and discharged.
[0020]
Then, the scum sucked from the feed well and the scum sucked from the processing tank are separately discharged from the discharge path formed separately, thereby floating in the feed well and the processing tank. Even if the amount of scum varies, it can be discharged reliably.
[Brief description of the drawings]
[1] shows a reference example of scan Kamusukima is a plan view showing a (A) is a plan view showing a Zenkatachi treatment tank, (B) Sukamusukima portion which is arranged.
FIG. 2 shows a scum inlet of the scum skimmer, (A) is a sectional view showing a scum inlet in a feed well, and (B) is a sectional view showing a scum inlet in a processing tank.
3 is a plan view showing the entire of an embodiment of Sukamusukima of the present invention.
4A is a sectional view showing a scum suction port in a feed well, FIG. 4B is a sectional view showing a scum suction port in a processing tank, and FIG. 4C is a longitudinal side view. .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Processing tank 11 Water surface in processing tank 2 Feed well 21 Water surface in feed well 3 Scum skimmer 3A, 3B Flow path 31, 32 Scum inlet 33 Rolling wheel 34, 35 Partition plate 4 Exhaust trough

Claims (1)

In the scum skimmer, which is arranged so as to be tiltable so as to suck and discharge floating scum, the scum floats in the feed well and floats in the processing tank. A scum skimmer characterized in that the discharge path of each scum is formed separately in the scum skimmer so that the scum is individually sucked and discharged.

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