JP2012200645A - Separator for sedimented sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separator for sedimented sand capable of easily obtaining separated liquid which does not contain foreign matters and suitably reusing the separated liquid.SOLUTION: A cylindrical screen 2A inside of which is communicated to a first outlet port 71 is arranged inside a water tank part 1 having an inlet port 51 and the first outlet port 71. Treated water is made to flow from the inlet port 51 to the inside of the water tank part 1 so as to precipitate sand, etc., heavy in specific gravity to a lower part inside the water tank part. Treated water containing residue, etc., light in specific gravity, is made to go from outside to inside of the screen 2A. On the outer surface of the screen 2A, the residue, etc., is removed from the treated water, and the separated liquid which does not contain foreign matters is made to flow inside the screen 2A. The separated liquid which has flowed inside the screen 2A is discharged from the first outlet port 71 to the outside of the separator 100 for sedimented sand.

Description

  The present invention relates to a sand settling machine provided in a sewage treatment plant or the like.

  2. Description of the Related Art Conventionally, a sand settling machine for separating sand and the like from treated water pumped from a sand settling basin is known. For example, the sand settling separator described in Patent Document 1 below includes a solid-liquid separation tank into which sewage-mixed water that is treated water is introduced, and a settling tank installed below the solid-liquid separation tank. The solid-liquid separation tank has a cylindrical cylindrical wall that generates a swirling flow in which the sewage mixed water flows in a tangential direction and descends along the peripheral wall, and an inverted head arranged at the bottom of the cylindrical wall. A conical screen-type separation hopper and a drainage duct for sending water near the center of the screen-type separation hopper upward by a pump and discharging it to the outside are provided. The screen type separation hopper is formed by arranging a large number of spiral screen bars in a spiral shape along the swirl flow direction, and the center bottom is opened. Then, the above-mentioned waste sand mixed water containing waste sand and gravel such as sand and gravel flows into the cylinder wall, and the centrifugal force generated by the swirling flow disperses the waste sand and the residue to separate the specific gravity and screen type separation. The particle size of the sand and gravel, which is dirty sand, is separated by the hopper sieve and dropped into the sedimentation tank, thereby collecting the low specific gravity and high specific gravity gravel near the center of the screen type separation hopper. The gravel with a large specific gravity is dropped into the settling tank through the opening at the center bottom of the screen type separation hopper and collected together with the sand, while the small specific gravity is discharged to the outside as a separation liquid together with water through the drainage duct. Yes.

JP 2008-279375 A

  In the sand settling separator, as described above, the separation liquid discharged from the drainage duct to the outside contains residue and the like. When this separated liquid is reused at a sewage treatment plant equipped with a sand settling separator, it is necessary to install an auto strainer etc. to remove residue from the separated liquid. There was a problem of increasing. For this reason, the separated liquid discharged from the sand settling machine is hardly reused.

  The present invention has been made in view of the above circumstances, and provides a sand settling machine in which a separation liquid that does not contain impurities such as sand and residue can be easily obtained, and the separation liquid can be suitably reused. The purpose is to do.

  A sand settling machine according to the present invention is disposed in an interior of a water tank unit having an inlet for flowing treated water, a water tank unit having a discharge port for discharging a separation liquid from which contaminants have been removed from the treated water, and And a cylindrical screen that communicates with the discharge port, and the screen is disposed inside the water tank so that the treated water flowing in from the inflow port flows from the outside to the inside of the screen. It is characterized by.

  In the sand settling machine according to the present invention, a cylindrical screen whose inside communicates with the discharge port is disposed in the water tank unit having the inlet and the discharge port, and the treated water flowing into the water tank unit is screened. It flows from the outside to the inside. Therefore, when the treated water flows into the water tank part, sand with a high specific gravity sinks to the lower part inside the water tank part, and the treated water with a light specific gravity and residue etc. moves from the outside to the inside of the screen. Residues and the like are removed from the treated water on the outer surface of the screen, and a separation liquid containing no contaminants flows inside the screen. Then, the separation liquid that has flowed into the screen is discharged to the outside through a discharge port communicating with the inside. Therefore, a separation liquid containing no impurities can be easily obtained, and the separation liquid can be suitably reused.

  Here, the screen preferably rotates about its axis, and a scraper that contacts the outer surface of the screen is preferably provided inside the water tank. In this way, foreign substances such as residue trapped on the screen can be removed from the screen, and clogging of the screen can be prevented.

  Moreover, it is preferable that a screen has a blade | wing which receives the treated water flow from an inflow port, and rotates by receiving a treated water flow with a blade | wing. In this way, the screen can be rotated with a simple configuration.

  Further, it is preferable that a dust discharge means for discharging at least one of the settled dust and the dust removed by the screen is provided below the screen. If it carries out like this, the settled foreign substance and the foreign substance removed with the screen can be suitably discharged | emitted from a water tank part only by foreign substance discharge means, such as a screw conveyor. In addition, in the sand settling machine described in the above-mentioned patent document 1, in order to discharge the residue remaining in the central part of the screen type separation hopper, it is used for discharging gravel or sand provided below the screen type separation hopper. In addition to the screw conveyor or the like, it is necessary to provide a discharge duct connected to the pump as described above, and there is a problem that the sand settling machine is complicated and expensive.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the sedimentation separator which can obtain easily the separation liquid which does not contain a contaminant, and can reuse a separation liquid suitably.

It is a schematic front view which shows the sand settling machine which concerns on 1st Embodiment of this invention. It is the II-II arrow sectional drawing in FIG. It is a schematic front view which shows the sand settling machine which concerns on 2nd Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. Further, the terms “left” and “right” correspond to the horizontal direction of the drawing and are for convenience.

  First, the sand settling machine according to the first embodiment of the present invention will be described.

  FIG. 1 is a schematic front view showing a sand settling machine according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along arrow II-II in FIG.

  The sedimentation separator 100 is provided in, for example, a sewage treatment plant, and removes contaminants such as sand and residue from treated water pumped up from a sedimentation basin of the sewage treatment plant. To get.

  As shown in FIG. 1, the sand settling machine 100 includes a water tank unit 1, and the inside of the water tank unit 1 is divided into a separation chamber 50, a first overflow chamber 70, and a second overflow chamber 80. The separation chamber 50 is located at the lower center of the water tank unit 1, the first overflow chamber 70 is located on the upper left side of the separation chamber 50, and the second overflow chamber 80 is located on the upper right side of the separation chamber 50. .

  The separation chamber 50 is a chamber into which treated water from the settling basin flows and stores the treated water, and an inflow port 51 through which the treated water flows is provided on the side surface. The inflow port 51 is provided so that treated water flows horizontally from the inflow port 51 into the water tank unit 1. The upper part of the separation chamber 50 protrudes and opens in a cylindrical shape toward the first overflow chamber 70, and the inside thereof communicates with the first overflow chamber 70. A communication port 52 communicating with the second overflow chamber 80 is provided on the upper right side of the separation chamber 50.

  Inside the separation chamber 50, a screen 2 </ b> A for removing impurities from the treated water stored in the separation chamber 50 and obtaining a separation liquid that does not contain impurities is disposed. The screen 2A has a cylindrical shape with a diameter smaller than that of the opening above the separation chamber 50, and the upper surface of the screen 2A penetrates the entire surface to form an opening 21A. A flange 22 that expands outward is provided on the outer surface of the opening 21A, and the outer peripheral edge of the flange 22 projects downward. The flange 22 is placed on the upper end surface of the cylinder so as to close the opening at the top of the separation chamber 50 with the flange 22, whereby the inside of the screen 2 </ b> A and the first overflow chamber 70 are pulled and the screen 2 </ b> A is pulled. Is communicated with a first discharge port 71 described later. The upper end surface of the screen 2 </ b> A is provided at a position lower than the communication port 52, so that a height difference dx is provided between the upper end surface of the screen 2 </ b> A and the communication port 52.

  The side surface of the screen 2A is formed of a wedge wire screen that extends in the horizontal direction and has a circular shape. As a result, the treated water flowing in from the inlet 51 and stored in the separation chamber 50 is directed from the outside to the inside of the screen 2A. It comes to flow. At this time, impurities such as residue and residue contained in the treated water are captured and removed on the outer surface of the screen 2A, and a separation liquid that does not contain impurities flows into the inside of the screen 2A. Then, the separation liquid that has flowed into the screen 2A overflows into the first overflow chamber 70 from the opening 21A.

  A rotary shaft 23 extends upward from the bottom surface of the shaft center portion of the screen 2 </ b> A. The rotary shaft 23 is a pair of bearings 24 that are spaced apart in the vertical direction outside the upper surface of the first overflow chamber 70. , 24 are rotatably supported. Four beams 25 extend inwardly on the inner surface of the screen 2A, and these four beams 25 are connected to the rotating shaft 23 (see FIG. 2). In addition, a plurality of blades 26A protruding outward are provided at equal intervals along the circumferential direction on the upper outer surface of the screen 2A, and can receive the flow of treated water flowing in from the inflow port 51 in the horizontal direction. It is like that. The screen 2 </ b> A is rotated around the rotation shaft 23 provided in the axial center portion by receiving the treated water flow from the inlet 51 with the plurality of blades 26 </ b> A.

  Inside the separation chamber 50, scrapers 4 and 4 are provided that contact (slidably contact) the outer surface of the screen 2A (see FIG. 2). The scraper 4 is made of, for example, a flexible resin.

  A first discharge port (discharge port) 71 that discharges the separation liquid overflowing from the opening 21 </ b> A to the outside of the sedimentation separator 100 is provided at the lower portion of the first overflow chamber 70. The separation liquid discharged from the first discharge port 71 is sent to, for example, a pump (not shown) that pumps water to a sand collection spray nozzle in a sand basin.

  The second overflow chamber 80 is a chamber for overflowing the treated water from the separation chamber 50 when the screen 2A is clogged and the treated water does not flow into the screen 2A. In the lower part of the second overflow chamber 80, second discharge ports 81, 81 are provided at two locations (see FIG. 2).

  A screw conveyor (contaminant discharging means) 3 is provided in the lower part of the separation chamber 50 so as to penetrate between them. The screw conveyor 3 further penetrates outside the water tank unit 1. In the screw conveyor 3, moisture is removed from the contaminants that have settled in the lower part of the separation chamber 50, and the contaminants are discharged from the sand sediment discharge port 31 to the outside of the sand sediment separator 100.

  In such a sand settling machine 100, when treated water flows into the separation chamber 50 from the inlet 51, the treated water is stored up to the upper end surface of the screen 2A. Among the contaminants contained in the stored treated water, sand having a high specific gravity settles in the lower part of the separation chamber 50, and the treated water having a light specific gravity and residue is directed from the outside to the inside of the screen 2A. At this time, residue and the like are removed from the treated water on the outer surface of the screen 2A, and a separation liquid containing no contaminants flows inside the screen 2A. The separation liquid flowing into the screen 2A overflows from the opening 21A to the first overflow chamber 70, and is further discharged from the first discharge port 71 to the outside of the sand settling separator 100.

  In addition, the sand sediment separator 100 is caused by the screw conveyor 3 to deposit dust such as sand that has settled in the lower part of the separation chamber 50, or out of the foreign matter such as scum removed by the screen 2 </ b> A into the lower part of the separation chamber 50. It is discharged outside.

  Further, the screen 2A is rotated by receiving the treated water flow from the inlet 51 with the blades 26A. At this time, the scrapers 4 and 4 which are in sliding contact with the screen 2A are trapped on the outer surface of the screen 2A. Contaminants are removed from the screen 2A.

  When the screen 2A is clogged, the treated water stored in the separation chamber 50 rises to the communication port 52 provided at a position higher than the upper end surface of the screen 2A by the height difference dx. The second overflow chamber 80 overflows from 52 and is further discharged from the second discharge ports 81, 81 to the outside of the sand settling separator 100.

  As described above, in the sand settling machine 100 according to the present embodiment, the cylindrical screen 2 </ b> A whose inside communicates with the first discharge port 71 is disposed inside the water tank unit 1 having the inflow port 51 and the first discharge port 71. Since the treated water that has flowed into the water tank 1 flows from the outside to the inside of the screen 2A, a separation liquid that does not contain impurities can be easily obtained, and the separation liquid is suitably reused. can do.

  In addition, in the sand settling machine 100, the screen 2A rotates around a rotating shaft 23 provided at the axis thereof, and the scraper 4 that abuts (slidably contacts) the outer surface of the screen 2A inside the water tank unit 1. , 4 can be removed from the screen 2A, such as debris trapped on the screen 2A, and clogging of the screen 2A can be prevented.

  Further, in the sand settling machine 100, the screen 2A has blades 26A that receive the treated water flow from the inlet 51, and rotates by receiving the treated water flow with the blades 26A. Therefore, the screen 2A is rotated with a simple configuration. Can do.

  Further, in the sand settling machine 100, the screw conveyor 3 that discharges the settled contaminants and the contaminants removed by the screen 2A is provided below the screen 2A. Therefore, the settled contaminants are removed by the screen 2A. The foreign matter can be suitably discharged from the water tank unit 1 only by the screw conveyor 3. On the other hand, in the sand settling machine described in Patent Document 1, in order to discharge the residue remaining in the center of the screen type separation hopper, the gravel and sand provided below the screen type separation hopper are discharged. In addition to the screw conveyor, it is necessary to provide a discharge duct connected to the pump, and there is a problem that the sand settling machine is complicated and expensive.

  Next, a sand settling machine according to a second embodiment of the present invention will be described.

  FIG. 3 is a schematic front view showing a sand settling machine according to the second embodiment of the present invention. As shown in FIG. 3, the sand sedimentation separator 200 according to this embodiment is mainly different from the sand sedimentation separator 100 according to the first embodiment (see FIG. 1) in that the blade 26 </ b> B that receives the treated water flow from the inlet 51. And the point which changed the structure of the screen 2B which has this. Specifically, the screen 2B has an opening 21B that is thinner than the opening 21A because the upper part is thinner than the lower part, and the outer diameter of the opening 21B is larger than the outer diameter of the opening 21A. A plurality of blades 26B are provided at equal intervals on the outer surface of the opening 21B. The blade 26B has a length that does not protrude from the side surface of the screen 2B.

  It goes without saying that such a sand settling machine 200 has the same effect as the sand settling machine 100 according to the first embodiment. In addition, the blade 26B has a length that does not protrude from the side surface of the screen 2B. The screen 2B can be downsized.

  The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, the screens 2A and 2B are formed of wedge wires in the horizontal direction, but may be in the vertical (vertical) direction or in both the vertical and horizontal directions. Further, the screens 2A and 2B may be formed of punching metal or the like instead of the wedge wires. In short, the screens 2A and 2B are made of treated water flowing from the outside to the inside of the screens 2A and 2B. What is necessary is just to be formed with what can be removed.

  In the above embodiment, the screens 2A and 2B are particularly preferably rotated by receiving the treated water flow by the blades 26A and 26B, but the upper end of the rotary shaft 23 is connected to a motor or the like, and You may make it rotate with the motive power by a motor.

  In the above-described embodiment, the screens 2 </ b> A and 2 </ b> B rotate about the rotation shaft 23, but the screen may be fixed to the water tank unit 1. In this case, the scrapers 4 and 4 are rotated, and foreign matters such as screen residue trapped on the outer surfaces of the screens 2A and 2B are removed. The screen may be a polygonal cylinder.

  In the above embodiment, the scraper 4 is formed of a flexible resin. However, the scraper 4 may be formed of a highly rigid metal or the like. In short, from the outer surfaces of the rotating screens 2A and 2B, What is necessary is just to be formed with the material which can remove the foreign material trapped on the outer surface and the residue.

  DESCRIPTION OF SYMBOLS 1 ... Water tank part, 2A, 2B ... Screen, 3 ... Screw conveyor (contaminate discharge means), 4 ... Scraper, 51 ... Inlet, 71 ... 1st discharge port (discharge port), 26A, 26B ... Blade | wing.

Claims (4)

A water tank unit having an inflow port for inflowing treated water, and a discharge port for discharging a separation liquid from which impurities are removed from the treated water;
It is arranged inside the water tank part, and has a cylindrical screen whose inside communicates with the discharge port,
The screen is disposed inside the water tank so that the treated water flowing in from the inlet flows from the outside to the inside of the screen;
A sand settling machine. The screen rotates about its axis;
The sand settling machine according to claim 1, wherein a scraper that contacts the outer surface of the screen is provided inside the water tank.   The sand sink according to claim 2, wherein the screen has blades that receive the treated water flow from the inlet, and rotates when the treated water flow is received by the blades.   The contaminant discharge means for discharging at least one of the settled contaminant and the contaminant removed by the screen is provided below the screen. The sedimentation separator described in 1.

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