JP5457967B2 - Injection nozzle for scum removal device - Google Patents

Description

  The present invention relates to an injection nozzle for a scum removing device used in a scum removing device having a pipe clearance.

  Conventionally, in a scum removing device provided with this type of pipe skimmer, the pipe skimmer is installed in such a manner that a part of the pipe skimmer is submerged in the water surface on the downstream side of the water tank in which the scum is generated. For example, if the aquarium is a sedimentation basin of a sewage treatment facility, the pipe skimmer is installed in such a way that part of it is submerged in front of the sedimentation water extraction side provided on the side opposite to the raw water inflow side of the sedimentation basin. Yes.

  This conventional pipe clearance is made of a pipe material having a length equal to the water channel width in a direction orthogonal to the water flow direction of the settling basin, and the pipe material is provided with an opening (notch) opened in the axial direction. ing. The pipe skimmer is provided with a rotation mechanism that rotates about the longitudinal axis, and is rotated so that a part of the opening is submerged in water when the scum is removed. It is comprised so that it may flow in into a pipe clearance from a part.

  In a scum removing device provided with a pipe skimmer, the removal of scum is performed in association with a water flow. That is, at the time of scum removal, a part of the opening of the pipe skimmer is located in the water, so that water starts to flow into the pipe skimmer through the opening. The scum that has floated on the surface of the water as a result of this flow of water also flows into the pipe skimmer, thereby removing the scum.

  By the way, normally, the flow of water in the water tank in which scum is generated is not fast. For example, when the water tank is a settling basin of a sewage treatment facility, the flow rate is about 3 to 5 cm / sec. If the scum is removed only by the flow of the scum, there is a problem that the discharge time of the scum becomes long.

  The longer scum discharge time means that the amount of water discharged increases with scum discharge. The discharged water is separated from the scum and then returned to the raw water supply side of the settling basin, so that the load of the settling basin is increased and the return of the water is performed by pumping up. For this reason, there is a disadvantage that power is wasted and power costs are increased.

When scum is discharged only by the flow of water, the above-mentioned problems are encountered.To solve this problem, the scum is moved along with the movement of the opening of the pipe skimmer below the surface of the water. On the other hand, in order to apply a moving force in the pipe skimmer side direction, pressure water having an inclination angle is injected on the upper surface of the scum (see Patent Documents 1 and 2).
That is, this injection of pressure water is configured by arranging a plurality of injection nozzles at predetermined intervals on a header pipe extending in a direction orthogonal to the water flow in the settling basin. Each of the injection nozzles is formed so that the outer shape of the injection nozzle is flat and widened, and the film-like pressure water can be sprayed toward the pipe skimmer side from a slit opened at the end face of the widening of the nozzle. Yes.

Japanese Patent No. 3934551 Japanese Patent Laid-Open No. 9-276860

  However, the spray nozzle of the above-described conventional scum removing device has a flat outer shape, and is capable of injecting film-like pressure water toward the pipe skimmer side from a slit opened at the end surface of the wide end. However, in order to uniformly inject pressure water having an inclination angle on the upper surface of the scum, careful adjustment at the site is required. If this adjustment is incomplete, for example, the force of movement in the pipe skimmer side direction with respect to the scum becomes small, and there is a problem that the function of the injection nozzle cannot be fully exhibited.

  Therefore, the present invention has been made to solve the above-described drawbacks, and the object thereof is to spray pressure water uniformly and stably, and an injection nozzle for a scum removing device that can be easily adjusted on site. Is to provide.

In order to achieve the above object, the scum removing device spray nozzle according to the present invention injects pressure water from above the water surface toward the opening of the pipe skimmer of the scum removing device. A scum removing device spray nozzle, wherein a pressure water chamber is provided inside the scum removing device spray nozzle body, and a slit is provided in the pressure water chamber so that a longitudinal direction thereof is parallel to the water surface, On the upper side of the opening of the slit, a rectifying plate connected to an upper plate forming the pressure water chamber and extending a predetermined distance in the direction in which the pressure water is jetted is provided.
The spray nozzle for a scum removing device according to claim 2 of the present invention is characterized in that the current plate has a semicircular planar shape.
The spray nozzle for a scum removing device according to claim 3 of the present invention is formed such that the thickness of the pressure water chamber opposite to the slit is sufficiently larger than the width of the slit, and the length thereof is smaller than the length of the slit. It is characterized by having.
The spray nozzle for a scum removing device according to claim 4 of the present invention is characterized in that the scum removing device is provided in an initial settling basin or a water basin of a sewage treatment facility.

The spray nozzle for a scum removing device according to claim 1 of the present invention is connected to the upper plate forming the pressure water chamber at the upper side of the opening of the slit provided in the pressure water chamber, and the pressure water is jetted. Since the rectifying plate extending in the horizontal direction for a predetermined distance toward the direction is provided, the pressure water can be sprayed uniformly and stably, and the spray nozzle for the scum removing device can be easily adjusted on site.
In the spray nozzle for scum removing apparatus according to claim 2 of the present invention, the flow straightening plate has a semicircular planar shape, so that the material cost is small and the periphery is circular. Can prevent injury when touched.
The spray nozzle for a scum removing device according to claim 3 of the present invention is formed such that the thickness of the pressure water chamber opposite to the slit is sufficiently larger than the width of the slit, and the length thereof is smaller than the length of the slit. Therefore, the water pressure and momentum of the water film sprayed from the slit can be made uniform.
The spray nozzle for a scum removing device according to claim 4 of the present invention can remove the scum in a short time and surely when the scum removing device is provided in the first sedimentation basin or water basin of the sewage treatment facility. it can.

It is a top view of a sedimentation basin provided with the injection nozzle for scum removal apparatuses concerning one embodiment of the present invention. (A) is a top view of the injection nozzle for scum removal apparatuses which concerns on one embodiment of this invention, (b) is a front view of the injection nozzle for scum removal apparatuses which concerns on one embodiment of this invention, (c) ) Is a right side view of an injection nozzle for a scum removing device according to an embodiment of the present invention, and (d) is a cross-sectional view taken along line X ₀ -X _{0 in} FIG. (A) is an enlarged sectional view taken along line X ₁ -X _{1 in} FIG. 1 when the opening of the pipe skimmer is located on the water surface, and (b) is a part of the opening of the pipe skimmer being underwater. is an enlarged sectional view of the X ₁ -X ₁ line in Figure 1 when located. Opening of the pipe gap is a cross-sectional view of the X ₂ -X ₂ line 1 when positioned on the water surface. Part of the opening of the pipe clearance is Ru sectional view der of X ₂ -X ₂ line in FIG. 1 when positioned in the water.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 illustrates a first sedimentation basin (hereinafter, “sedimentation basin”) of a sewage treatment facility equipped with a scum removal device spray nozzle (hereinafter referred to as “spray nozzle”) according to an embodiment of the present invention. .) Is a plan view.

  In the sedimentation basin 1, water is configured to flow from the left side to the right side. The sedimentation basin 1 is provided with a sludge scraping mechanism for discharging the settled sludge, as in the known sedimentation basin 1, but it is not related to the description of the present invention, so that detailed description thereof is omitted. In an actual sewage treatment facility, a plurality of sedimentation basins are provided, but only one sedimentation basin is shown here to simplify the drawing.

  In the figure, a is a pipe clearance, a part of which is submerged in the front side of the sedimentation water extraction part 2 of the sedimentation basin 1, that is, a part of the sedimentation water 1 upstream from the sedimentation water extraction part 2, and the sedimentation tank 1 It is provided over the entire channel width in the direction orthogonal to the water flow direction.

  One end portion (upper end portion in FIG. 1) of the pipe skimmer a is located in a scum pit 3 that passes through one tank wall of the settling basin 1 and is provided outside the tank wall, and is opened. The water including the scum can be discharged into the scum pit 3 from the one end portion.

And the other end part formed in the closed shape of the pipe skimmer a is pivotally supported by the other tank wall of the sedimentation basin 1, and the pivot is centered on the axis of the pipe skimmer a. A rotation drive mechanism 4 is provided for rotation.
In addition, the part which penetrates the tank wall of the one end part side of the pipe skimmer a, and the support shaft part which penetrates the tank wall of the other end part are each configured to be able to rotate with the tank wall as a bearing, and the bearings thereof. These mechanisms are each configured to be watertight, and are devised so that water in the sedimentation basin 1 does not leak.

  The pipe clearance a is composed of a pipe material P having a length slightly longer than the water channel width in the direction orthogonal to the water flow direction of the settling basin 1 and a circular cross-sectional shape. An opening (notch) 5 is provided in the opening. The inner diameter of the pipe material P is determined so that water including scum taken in from the opening 5 can be quickly discharged into the scum pit 3.

  In the figure, 6 is a pressure water supply pipe provided above the water surface position, provided upstream from the position of the pipe skimmer a by a predetermined distance and in a direction perpendicular to the water flow direction of the settling basin 1. It has been. In this pressure water supply pipe 6, the injection nozzles N, N... Hang down through connecting pipes 7, 7... And 90 degrees bent pipes, so-called elbows 8, 8. It is provided slightly above the water surface position. That is, these injection nozzles N, N... Are provided slightly above the water surface position.

  The injection direction of the pressure water from these injection nozzles N, N... Is determined so as to face the opening 5 side of the pipe skimmer a. The pressure water pressure and the amount of water injected from the injection nozzles N, N... Are determined to be sufficient to promote the flow of the scum S. Moreover, since the number of these spray nozzles N, N... Is sprayed from each spray nozzle N, the pressure water spreads over the entire channel width in the direction orthogonal to the water flow direction of the settling basin 1. To be decided.

Since the configuration of each of the injection nozzles N, N... Is the same, one injection nozzle N will be described below with reference to FIGS. 1A is a plan view of an injection nozzle N corresponding to the injection nozzle body of the present invention, FIG. 1B is a front view of the injection nozzle N, and FIG. A right side view of the nozzle N, (d) is a cross-sectional view taken along line X ₀ -X _{0 of} FIG.

  The plane shape of the injection nozzle N, that is, the shape when the sedimentation basin 1 is viewed from the plane (see FIG. 1), is the side where the pressure water is injected as shown in FIG. The upper plate 10a and the lower plate 10b are formed so that the right side in a) is wide, and the side opposite to the side where the pressure water is provided on both sides of both plates 10a and 10b is wide. The right side plate 11a and the left side plate 11b formed on the side plate, the upright plate 12 to which the elbow 8 is connected and the upper side of the plates 10a, 10b, 11a, 11b, which are opposite to the side where the pressure water is injected, The plate 10a is provided integrally with the plate 10a, and the flat shape protruding horizontally on the side where the pressure water is jetted is composed of a rectifying plate 13 having a semicircular shape.

Inside the injection nozzle N, the above-described plates 10a, 10b, 11a, 11b and 12 gradually increase the side on which the pressure water is injected when viewed from the plane as shown in FIG. Further, as shown in FIG. 2D, a pressure water chamber R formed by a space in which the side on which the pressure water is injected gradually narrows when viewed from the cross section is configured.
And the slit 14 which is an elongate opening whose longitudinal direction is parallel to a water surface is formed in the end surface by the side of the pressure water of this pressure water chamber R injecting. Further, a rectifying plate 13 having a semicircular planar shape protruding in the direction of jetting the pressure water is integrally provided on the upper plate 10a corresponding to the upper side of the opening forming the slit 14. The size of the slit 14 is not uniform depending on the properties of the scum S generated in the sedimentation basin 1, but is determined so that a water film having a predetermined water pressure can be ejected.

  In addition, although the planar shape of the rectifying plate 13 is a semicircular shape, it may be a trapezoidal shape or the like obtained by extending the upper plate 10a as it is. However, when it is semicircular as shown in the figure, the material cost can be reduced and the periphery is circular, so that injury can be prevented when an operator touches it. In any case, the rectifying plate 13 may be a flat plate material having a predetermined area extending from the upper side of the slit 14 in the pressure water injection direction.

When the pressure water is supplied from the pressure water supply pipe 6 to the inside of the injection nozzle N through the connecting pipe 7 and the elbow 8, the injection nozzle N having the above configuration is directed from the slit 14 toward the opening 5 of the pipe skimmer a. Pressure water is jetted (see FIG. 3B described later). The pressure water jetted from the slit 14 is prevented from going upward by the rectifying plate 13, and acts to regulate the flow of the pressure water jetted from the slit 14. When sprayed, it is sprayed with a well-shaped fan shape. The pressure water sprayed from the slit 14 gradually comes into contact with the upper surface of the scum S. Thereby, a moving force in the direction of the opening 5 is applied to the scum S. Further, when the scum S grows in a large plate shape, the scum S is crushed into pieces suitable for movement by the pressure water sprayed from the slit 14.
Further, the pressure water chamber R is sufficiently thicker than the width of the slit 14 on the side opposite to the slit 14 (see FIGS. 2B and 2C), and further, is smaller than the length of the slit 14 (FIG. 2 ( a) and (b)), the water pressure and the momentum of the water film ejected from the slit 14 are uniformly prepared.
The injection direction of the pressure water injected from the slit 14 is directed to the direction of the opening 5 of the pipe skimmer a, but a specific injection angle with respect to the water surface, that is, an injection angle with respect to the surface of the scum S is generated in the sedimentation basin 1. Although it is not uniform depending on the properties of the scum S, it is finally determined by several scum removal experiments at the site. This adjustment of the injection angle can be performed simultaneously for all the injection nozzles N, N... By rotating the pressure water supply pipe 6 around its axial direction. In any case, the adjustment of the injection angle is considered so that the injection angle with respect to the surface of the scum S is too large so that the scum S is too submerged in the water and the submerged scum S does not pass below the pipe skimmer a. .

  The injection nozzle N having the above-described configuration has a feature that a moving force can be efficiently applied to the scum S without requiring detailed adjustment at the site. Further, since the scum S can be moved to the opening 5 of the pipe skimmer a in a short time, the amount of water associated with the discharge of the scum S can be reduced, and an excellent effect that energy saving can be achieved is obtained. be able to. That is, the injection nozzle N having the above-described configuration has a property that can greatly contribute to so-called ecological measures.

  Next, the scum removing operation in the scum removing device of the present embodiment having the above-described configuration will be described with reference to FIGS. 3 (a) and 3 (b) to FIG. If the sedimentation basin 1 is performing a sedimentation process and the pipe skimmer a is positioned on the water surface as shown in FIGS. 3A and 4, the upstream side of the pipe skimmer a. Scum S is generated on the water surface.

  When the generation of the scum S shows a certain area, the pipe skimmer a passes through the rotational drive mechanism 4 so that a part of the opening 5 of the pipe skimmer a is located in the water (so as to be submerged in the water). While being rotated, pressure water is supplied to the pressure water supply pipe 6 through a pump (not shown) (see FIGS. 3B and 5). By supplying the pressure water, the pressure water is ejected from the slits 14 of the ejection nozzles N, N.

  Therefore, pressure water is injected from the injection nozzles N, N... Toward the opening 5 of the pipe skimmer a, and thereby the movement of the scum S toward the opening 5 of the pipe skimmer a is further promoted. The scum S is sucked into the pipe skimmer a through the opening 5 of the pipe skimmer a along with water.

  The timing for rotating a part of the opening 5 of the pipe skimmer a through the rotation drive mechanism 4 so as to be located in the water and the time for the part to be located in the water are the same for the scum S generated by the quality of the water flowing into the sedimentation basin 1. Since it is not so, it is desirable to determine by experiment. In other words, it is desirable to determine the scum S by observing the discharge state of the scum S manually once a day for the first few days of operation of the apparatus. Thereafter, automatic operation is performed based on the observation result.

  However, the start control of the automatic operation is not limited to the above example. A scum detection sensor is arranged on a predetermined surface of the settling basin 1 to detect that the scum is filled up to the scum detection sensor arrangement position. Alternatively, scum removal may be performed automatically by arranging a plurality of various detection sensors.

  The timing at which pressure water is supplied to the pressure water supply pipe 6 to inject the pressure water from the injection nozzles N, N... Toward the opening 5 of the pipe skimmer a is synchronized with the timing at which a part of the opening 5 is positioned in the water. To be controlled. In addition, the timing which positions a part of opening part 5 in water, and the timing which injects pressure water toward the opening part 5 from the injection nozzles N, N ... are not limited at the time of automatic operation, but are always performed manually. It may be.

  The scum S flowing into the pipe skimmer a passes through the pipe skimmer a and is discharged to the scum pit 3, and the scum S in the scum pit 3 is processed by a processing means such as a sludge processing machine (not shown). Moreover, the treated water discharged | emitted by the precipitation treated water extraction part 2 is sent out to the next process means side, such as a biological treatment.

  The scum removing device having the above configuration can move the scum S to the opening 5 of the pipe skimmer a in a short time using the injection nozzles N, N, and therefore the amount of water accompanying the discharge of the scum S is small. Thus, an excellent effect that energy saving can be achieved can be obtained. That is, the scum removing device having the above-described configuration has a property that can greatly contribute to so-called ecological measures.

The injection nozzle according to the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above-described embodiment, and design changes and the like can be made without departing from the scope of the present invention. Is possible.
For example, in the above-described example, the cross-sectional shape of the pipe material P is circular, but this can also be rectangular.
In the above example, the spray nozzles N, N... Are applied to the first settling basin of the sewage treatment facility, but may be applied to an inflow basin (water conduit) that distributes sewage to the basin. In this case, a movable weir is provided at the installation portion of the pipe skimmer a in FIG. 1, and a scum pit is provided on the side of the movable weir opposite to the injection nozzles N, N.
Furthermore, the pressure water supply pipe 6 disposed above the water surface of the settling basin 1 is not limited to the example shown in FIG. 1. For example, a plurality of pressure water supply pipes are provided at a predetermined interval on the upstream side of the pipe skimmer a. It is good also as a structure which injects pressure water from the injection nozzle provided in those pressure water supply pipes. By doing so, in the case of a sedimentation basin having a long distance in the flowing water direction, the flow of scum can be more efficiently promoted.

1 ... Sedimentation basin (first sedimentation basin)
2 …… Precipitation treated water extraction part 3 …… Scum pit 4 …… Rotation drive mechanism 5 …… Opening part 6 …… Pressure water supply pipe 7 …… Connecting pipe 8 …… Elbow N …… Injection nozzle (injection for scum removing device) Nozzle, spray nozzle body for scum removal device)
10a …… Upper plate 10b …… Lower plate 11a …… Right side plate 11b …… Left side plate R …… Pressure water chamber 12 …… Vertical plate 13 …… Rectifying plate 14 …… Slit a …… Pipe clearance P …… Pipe material S …… Scum

Claims (4)

An injection nozzle for a scum removal device that injects pressure water from above the water surface toward the opening of the pipe skimmer of the scum removal device,
Provided with a pressure water chamber inside the scum removing apparatus for injection nozzle body, the slit longitudinal direction is open so as to parallel to the water surface in the pressure water chamber provided, on the upper side of the opening of the slit, the pressure An injection nozzle for a scum removing device, characterized in that a rectifying plate connected to an upper plate forming a water chamber and extending a predetermined distance in a direction in which pressurized water is injected is provided.   2. The scum removing device spray nozzle according to claim 1, wherein the flow straightening plate has a semicircular planar shape. 3.   The scum removing device spray nozzle according to claim 1 or 2, wherein the thickness of the pressure water chamber opposite to the slit is sufficiently larger than the width of the slit, and the length thereof is smaller than the length of the slit. An injection nozzle for a scum removing device.   The scum removing device spray nozzle according to any one of claims 1 to 3, wherein the scum removing device is provided in an initial sedimentation basin or a water basin of a sewage treatment facility.

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