WO2021033781A1 - Discharge nozzle for scum removal device - Google Patents

Discharge nozzle for scum removal device Download PDF

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Publication number
WO2021033781A1
WO2021033781A1 PCT/JP2020/032794 JP2020032794W WO2021033781A1 WO 2021033781 A1 WO2021033781 A1 WO 2021033781A1 JP 2020032794 W JP2020032794 W JP 2020032794W WO 2021033781 A1 WO2021033781 A1 WO 2021033781A1
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WO
WIPO (PCT)
Prior art keywords
scum
water
opening
removing device
ejection nozzle
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Application number
PCT/JP2020/032794
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French (fr)
Japanese (ja)
Inventor
秀雄 宇都宮
宏冶 田中
Original Assignee
宇都宮工業株式会社
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Filing date
Publication date
Application filed by 宇都宮工業株式会社 filed Critical 宇都宮工業株式会社
Publication of WO2021033781A1 publication Critical patent/WO2021033781A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/32—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages in which a valve member forms part of the outlet opening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material

Definitions

  • the present invention relates to an ejection nozzle for a scum removing device used in a scum removing device.
  • a conventional scum removing device for example, a scum removing device provided with a conventional pipe gap, is installed so that the pipe gap is partially submerged in the water surface on the downstream side of the water tank in which the scum is generated.
  • the tank is a settling basin for a sewage treatment facility such as sewage
  • the pipe gap will be partially submerged in front of the surface water take-out side provided on the opposite side of the settling basin from the raw water inflow side. is set up.
  • This conventional pipe gap is made of a pipe material having a length equal to the width of the water channel in the 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 gap is provided with a rotation mechanism that rotates around an axial center in the longitudinal direction, and is rotated so that a part of the opening is submerged in water when the scum is removed. Due to this rotation, the scum flowed into the pipe gap through the opening and was taken in.
  • the scum removing device provided with the pipe gap, the scum is removed by accompanying the water stream. That is, when the scum is removed, a part of the opening of the pipe sukima is located in the water, so that the surface water starts to flow into the pipe sukima through the opening. Due to this inflow of water, the scum floating on the water surface is also flowed into the pipe gap, whereby the scum is removed.
  • the flow of water in the aquarium where scum is generated is not fast, for example, the water tank is settled in a sewage treatment facility.
  • the flow velocity is about 3 to 5 cm / sec, and therefore, if the scum is removed only by the inflow of water on the surface of the water tank where scum is generated, there is a problem that the scum discharge time becomes long. doing.
  • the discharge time becomes longer. The longer scum discharge time means that the amount of water discharged with the scum discharge increases.
  • the discharged water is returned to the raw water side again, which has a problem of increasing the load on the sewage treatment facility.
  • a spray nozzle is provided at an upper position of the scum, and pressure water is ejected diagonally downward from the spray nozzle. , It is done to give the scum movement power.
  • the generated scum is in the form of a thin film, for example, in the case of a thin film scum generated in the final sedimentation basin of a sewage treatment facility, when pressure water is ejected to the scum, turbulence is generated in the water flow.
  • the applicant proposes a scum removing device shown in Patent Document 1 and a ejection nozzle for a scum removing device shown in Patent Document 2 suitable for this scum removing device. doing.
  • a tip portion is generated on the water surface when the opening is located on the water surface at the lower side forming the opening provided in the pipe gap.
  • a guide plate extending to a predetermined length is provided on the upstream side of the water flow while maintaining the depth located below the scum, and a part of the opening is provided at a predetermined position on the upstream side of the tip position of the guide plate.
  • the opening of the ejection nozzle body is characterized by being provided with a closing member that closes the opening by buoyancy when pressure water is not ejected from the nozzle.
  • a water flow having a high flow velocity toward the opening of the pipe gap can be generated on the upper surface side of the guide plate, and the scum is made to flock along with the fast water flow. It can be moved to the opening of the pipe gap in a short time and surely without causing it. Therefore, it is possible to prevent deterioration of the treated water quality to be discharged, and it is possible to reduce the amount of water associated with scum discharge and to save energy.
  • the scum removing device according to Patent Document 1 has a property that can greatly contribute to so-called eco-friendly measures, and is put into practical use as "Nichiichi-kun" (registered trademark).
  • the opening of the ejection nozzle for the scum removing device is open except when pressure water is supplied to the ejection nozzle body for the scum removing device. Since it is closed by a closing member that operates by buoyancy, it has a feature that it is possible to effectively prevent the inside of the ejection nozzle body for the scum removing device from being contaminated by scum or the like and being blocked.
  • the closing member of the ejection nozzle for the scum removing device has a drawback that the volume of the closing member increases in order to obtain the buoyancy because the closing member is operated by the buoyancy to close the opening.
  • the ejection nozzle itself for the scum removing device becomes larger due to the larger size of the closing member.
  • the ejection nozzle itself for the scum removing device is installed in water, it has been desired to have a structure having as few irregularities as possible that does not resist the flow of water as much as possible. Furthermore, a large mechanism such as a guide plate was required, and a complicated structure was unavoidable.
  • the present invention has been made for the purpose of solving the above problems, and for example, to provide a ejection nozzle for a scum removing device capable of operating the closing member without enlarging the closing member.
  • the following configuration is provided as one means for achieving the above object. That is, it is a scum removing device ejection nozzle that ejects pressure water from the water toward the opening of the pipe gap of the scum removing device, and the scum removing device ejecting nozzle is opened at the opening of the scum removing device ejection nozzle main body.
  • a closing member that rotates by its own weight to close the opening is provided.
  • the closing member is a movable portion having a closing portion that rotatably supports one end side in the ejection nozzle body for the scum removing device and closes the opening of the ejection nozzle body for the scum removing device on the other end side.
  • the movable portion is characterized in that a weight is provided.
  • the lower side forming the opening of the pipe gap of the scum removing device has a depth at which the tip is located below the scum generated on the water surface when the opening is located on the water surface. It is characterized in that a guide plate extending to a predetermined length is provided on the upstream side of the water flow while maintaining the above.
  • the scum removing device is characterized in that it is provided in a settling basin in which sewage is biologically treated and then settled and separated.
  • a ejection nozzle for a scum removing device capable of operating the closing member without enlarging the closing member.
  • FIG. 1 is a plan view of a settling pond provided with a ejection nozzle for a scum removing device according to an embodiment of the present invention.
  • Figure 2 (a) is a X 1 -X 1 line sectional view of FIG 1 when the ejection nozzles for scum removal apparatus according to an embodiment of the present invention pressurized water is not ejected.
  • Figure 2 (b) is a X 1 -X 1 line sectional view of FIG 1 when a pressure water is jetted from the scum removing apparatus for jetting nozzle.
  • FIG. 3 is a perspective view of a ejection nozzle for a scum removing device according to an embodiment of the present invention.
  • FIG. 1 is a plan view of a settling pond provided with a ejection nozzle for a scum removing device according to an embodiment of the present invention.
  • Figure 2 (a) is a X 1 -X 1 line sectional view of FIG 1 when the ejection
  • FIG. 4 is a plan view showing a part of the ejection nozzle for the scum removing device according to the embodiment of the present invention in cross section.
  • 5 (a) is a sectional view showing a part of the X 2 -X 2 line in FIG. 4 in cross-section and indicates when the pressure water is ejected from the ejection nozzle scum removing apparatus.
  • FIG. 5B shows the time when the pressure water is not ejected.
  • FIGS. 1 and 2 (a). , (B) will be used to describe the final settling basin (hereinafter referred to as “settling basin”) of the sewage treatment facility equipped with this ejection nozzle.
  • settling basin the final settling basin of the sewage treatment facility equipped with this ejection nozzle.
  • water is configured to flow from the left side to the right side.
  • the settling basin 1 is provided with a sludge scraping mechanism for discharging the settled sludge, but the detailed description thereof is omitted because it is not directly related to the understanding of the present embodiment.
  • a is a pipe gap, in which a part of the sedimentation basin 1 is submerged in front of the supernatant water extraction section 2, that is, a predetermined distance upstream from the supernatant water extraction section 2, and the water flow of the sedimentation basin 1. It is provided over the entire width of the channel in the direction orthogonal to the direction.
  • One end (upper end in FIG. 1) of the pipe gap a is located in a scum pit 3 provided outside the tank wall through one tank wall of the settling basin 1, and is opened.
  • the other end of the pipe gap a is rotatably supported by the other tank wall of the settling basin 1, and the support shaft is a rotary drive mechanism 4 that rotates around the axis of the pipe gap a.
  • the portion of the pipe gap a that penetrates the tank wall on one end side and the support shaft portion that penetrates the tank wall on the other end side are configured to be rotatable with the tank wall as a bearing, and their bearings.
  • Each of the mechanisms is watertight, and is devised so that the water in the settling basin 1 does not leak.
  • the pipe clearance a is made of a pipe material P having a length slightly longer than the width of the water channel in a direction orthogonal to the water flow direction of the settling basin 1 and having a circular cross-sectional shape.
  • An opening (notch) 5 is provided.
  • the inner diameter of the pipe material P is determined so that the water containing the scum taken in from the opening 5 can be quickly discharged into the scum pit 3.
  • reference numeral 7 denotes a pressure water supply pipe provided near the water surface, which is provided on the upstream side of a predetermined distance from the opening of the pipe gap a and in a direction orthogonal to the water flow direction of the settling basin 1. There is.
  • the pressure water supply pipe 7 is provided with ejection nozzles N, N ...
  • the injection direction of the pressure water of the ejection nozzles N, N ... Is determined to be on the upper surface side of the plate-shaped guide plate 6 and on the lower side side of the opening 5 of the pipe gap a.
  • the pressure of the pressure water ejected from the ejection nozzles N, N ... And the amount of the pressure water are determined to be sufficient to promote the flow of water toward the opening 5.
  • the ejection nozzle N according to the embodiment of the present invention will be described. Since the configurations of the ejection nozzles N, N ... Used in the settling basin 1 are the same, one ejection nozzle N will be described with reference to FIGS.
  • the overall shape of the ejection nozzle body (hereinafter referred to as "nozzle body") 10 for the scum removing device is formed in a thin box shape so as not to resist the water flow as much as possible.
  • the planar shape of the nozzle body 10 is formed so that one side (the right side in FIGS. 3 and 4) is wide as shown in FIGS. 3 and 4.
  • the nozzle body 10 is provided with an opening 11 on one side (wide side). Therefore, when the shape of the opening 11 is viewed from the outside of the nozzle body 10, it has a slit shape parallel to the water surface of the settling basin 1. Further, on the other side of the nozzle body 10, a mounting portion 12 having a screw groove is provided around the nozzle body 10.
  • the mounting portion 12 screw is formed so as to be screwed into a screw hole (not shown) provided in the connecting pipe 8 of the settling basin 1. Therefore, the nozzle body 10 can be detachably attached to the connecting pipe 8 via the attachment portion 12.
  • the closing member 20 is provided inside one side (wide side) of the nozzle body 10.
  • the closing member 20 includes a movable portion 21, a closing portion 22, and a weight 23.
  • the movable portion 21 is made of a flat plate material whose planar shape can freely move up and down inside the wide side of the nozzle body 10, and the plate thickness is such that the movable portion 21 is in contact with the upper wall 10a of the nozzle body 10.
  • Support shafts 21a and 21a are provided on both sides of one end side of the movable portion 21 (opposite side of the opening 11 of the nozzle body 10), and these support shafts 21a and 21a are the upper walls of the nozzle body 10. It is rotatably provided on the side wall near 10a.
  • the closing portion 22 is formed so that a part of the other end side (opening 11 side of the nozzle body 10) of the movable portion 21 is folded upward, and is at a position where it substantially abuts on the outside of the opening 11 of the nozzle body 10. It is provided (see FIG. 5 (a)).
  • the height of the closing portion 22 is formed so as to cover the opening 11 (see FIG. 5B).
  • the weights 23 are made of disk-shaped iron, and two weights 23 are provided on the upper surface of the closing portion 22 via screws 24 at predetermined intervals. These weights 23 are devised so that when the movable portion 21 comes into contact with the upper wall 10a of the nozzle body 10, the weight 23 can be retracted into the upper wall 10a (see FIG. 5A). Therefore, even if the weight 23 is provided on the movable portion 21, the opening area of the opening 11 provided on the nozzle body 10 can be sufficiently secured.
  • the weight of the weight 23 is determined within a range in which the movable portion 21 can move when pressure water is supplied to the nozzle body 10.
  • the closing member 20 having the above configuration, when pressure water is supplied from the pressure water supply pipe 7 to the ejection nozzle N via the connecting pipe 8, as shown in FIG. 5A, the movable portion 21 is moved by water pressure. It is rotated upward around the support shafts 21a and 21a. As a result, the closing portion 22 can rotate upward to open the opening 11. Further, when the pressure water is not supplied from the pressure water supply pipe 7 to the ejection nozzle N via the connecting pipe 8, the movable portion 21 is centered on the support shafts 21a and 21a as shown in FIG. 5 (b). Then, it is rotated downward by its own weight. As a result, the closing portion 22 can rotate downward to close the opening 11.
  • the closing member 20 having the above configuration is provided with two weights 23 made of disk-shaped iron in order to increase the weight of the movable portion 21, but the weights can also be made into a single strip. Further, when the closing member 20 itself has a sufficient weight, for example, when the movable portion 21 and the closing portion 22 are made of steel, the weight 23 can be omitted. However, when the portion of the nozzle body 10 excluding the weight 23 and the screw 24 is made of synthetic resin, it is preferable to provide the weight 23 in order to ensure the movement of the movable portion 21. Further, the ejection nozzle N having the above configuration can be easily manufactured as a synthetic resin.
  • the portion of the upper wall 10a into which the closing member 20 is incorporated is opened, and the opened portion is closed after the closing member 20 is incorporated into the nozzle body 10.
  • the scum removing operation of the settling basin 1 provided with the ejection nozzle N having the above configuration will be described.
  • the opening 5 of the pipe gap a is located on the water surface.
  • a thin film scum S is generated on the water surface on the upstream side of the pipe gap a.
  • the pipe gap a is set so that a part of the opening 5 of the pipe gap a is located in the water (submerged in water) via the rotation drive mechanism 4.
  • pressure water is supplied to the pressure water supply pipe 7 via a pump (not shown) (see FIGS. 2 (b) and 5 (a)).
  • the movable portion 21 is rotated upward around the support shafts 21a and 21a by water pressure.
  • the closing portion 22 can rotate upward to open the opening 11. Then, pressure water is ejected from the opened opening 10 (see FIGS. 2 (b) and 5 (a)). Therefore, the pressure water is ejected from the ejection nozzle N toward the opening 5 of the pipe gap a, which promotes the flow of water toward the opening 5 on the upper surface side of the guide plate 6. Then, the scum S is moved into the pipe gap a along with the water whose flow has been accelerated while maintaining the thin film shape without being flocculated, and is sucked into the opening 5 of the pipe gap a.
  • the timing of rotating a part of the opening 5 so as to be positioned in water via the rotation drive mechanism 4 and the time for positioning the opening 5 in water are experiments because the scum S generated by the water quality flowing into the settling basin 1 is not uniform. Is determined by. That is, it is desirable to manually operate the device about once a day for the first few days of the device operation and observe and determine the discharge state of the scum S. After that, automatic operation is performed based on the observation result.
  • the start control of automatic operation is not limited to the above example, and a scum detection sensor is arranged on a predetermined surface of the settling basin 1 and it is detected that the scum is filled up to the scum detection sensor arrangement position.
  • a plurality of various detection sensors may be arranged to automatically remove the scum.
  • the timing of supplying the pressure water to the pressure water supply pipe 7 and injecting the pressure water from the ejection nozzle N toward the opening 5 of the pipe gap a is synchronized with the timing of locating a part of the opening 5 in the water. Be controlled.
  • the timing of locating a part of the opening 5 of the pipe gap a in water and the timing of injecting pressure water from the ejection nozzle N toward the opening 5 of the pipe gap a are not limited to those during automatic operation. You may always do it manually.
  • the opening 11 of the nozzle body 10 is closed by the closing member 20, and the inside of the nozzle body 10 is contaminated with scum or the like contained in water. Blockage is effectively prevented.
  • the scum S that has flowed into the pipe gap a passes through the pipe gap a and is discharged to the scum pit 3, and the scum S in the scum pit 3 is treated by a treatment means such as a sludge treatment machine (not shown).
  • the supernatant water (treated water) discharged to the supernatant water extraction unit 2 is discharged into a water system such as a river.
  • the scum removing device provided with the ejection nozzle N according to the present embodiment having the above configuration can move the scum S to the opening 5 in a short time without flocking it and accompanying it with a fast water flow. Therefore, it is possible to prevent deterioration of the treated water quality to be discharged, and it is possible to obtain an excellent effect that the amount of water associated with the discharge of the scum S can be reduced and energy saving can be achieved. That is, the scum removing device having the above configuration has a property that can greatly contribute to so-called eco-friendly measures.
  • the opening 11 of the nozzle body 10 is closed by the closing member 20 except when the scum is discharged, and the inside of the nozzle body 10 is contaminated by scum or the like contained in water. It is effectively prevented from being blocked.
  • the closing member 20 of the ejection nozzle N is provided in the nozzle body 10 and is driven by its own weight and the pressure water supplied in the nozzle body 10, the nozzle body 10 can be miniaturized and the nozzle body 10 can be miniaturized. It can be in the form of low resistance to water flow.
  • the ejection nozzle according to the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the above-described embodiment, and design changes and the like can be made without departing from the gist of the present invention. It is possible.
  • the cross-sectional shape of the pipe material P is circular, but this can also be rectangular. Alternatively, it is of course applicable to the trough type. It is possible to efficiently move and discharge a scum or the like near the water surface by a water stream without stirring.
  • the ejection nozzle N is applied to the final settling basin of the sewage treatment facility, but the settling basin may be the first settling basin or another settling basin for factory wastewater.
  • the ejection nozzle for the scum removing device of the present embodiment is rotated by its own weight when pressure water is not ejected from the ejection nozzle main body for the scum removing device into the opening of the ejection nozzle main body for the scum removing device.
  • the ejection nozzle body for the scum removal device itself can be miniaturized, and the inside of the ejection nozzle body for the scum removal device is contaminated by scum or the like contained in water. Can be effectively prevented.
  • the ejection nozzle for the scum removing device of the present embodiment is composed of a rotatable movable portion having a closing portion for closing the opening of the ejection nozzle main body for the scum removing device, so that the opening can be easily closed. It can be carried out. Further, since the ejection nozzle for the scum removing device is provided with a weight in the movable portion, the rotational power of the movable portion can be further increased.
  • the ejection nozzle for the scum removing device of the present embodiment is provided with a guide plate on the lower side forming the opening of the pipe gap, the scum can be efficiently guided into the pipe gap. Further, since the ejection nozzle for the scum removing device of the present embodiment is provided in the settling basin where the scum removing device biologically treats the sewage and then setstles and separates the sewage, the scum is not flocculated in a short time. Moreover, it can be reliably guided into the pipe gap.

Abstract

Provided is a discharge nozzle N for a scum removal device, the discharge nozzle N discharging pressurized water from underwater towards an opening section of a pipe skimmer of the scum removal device. An opening 11 of a discharge nozzle body 10 for the scum removal device is provided with a closure member 20 that closes the opening 11 by the weight of the closure member 20 itself when pressurized water is not discharged from the discharge nozzle body 10 for the scum removal device. Through said discharge nozzle for a scum removal device, the inside of the discharge nozzle is not easily contaminated by scum, etc., contained in the water.

Description

スカム除去装置用噴出ノズルEjection nozzle for scum removal device
　本発明はスカム除去装置に用いられるスカム除去装置用噴出ノズルに関する。 The present invention relates to an ejection nozzle for a scum removing device used in a scum removing device.
　従来のスカム除去装置、例えば従来のパイプスキマを備えたスカム除去装置は、そのパイプスキマはスカムが発生する水槽の下流側の水面に一部が水没する形で設置されている。例えば、その水槽が下水等の汚水処理施設の沈殿池の場合、パイプスキマは、沈殿池の原水流入側と反対側に設けられている表面水の取出側の手前に一部が水没する形で設置されている。
　この従来のパイプスキマは、沈殿池の水流方向と直交する方向の水路幅に等しい長さのパイプ材からなり、そのパイプ材には、軸心方向に開口した開口部（切欠部）が設けられている。そしてこのパイプスキマには、長手方向の軸心を中心にして回転する回転機構が設けられていて、スカム除去時に開口部の一部が水中に没するように回転される。この回転により、スカムは開口部からパイプスキマ内に流入して取り込まれていた。
　上述のように、パイプスキマを備えたスカム除去装置においては、スカムの除去は水流に同伴させて行われる。すなわち、スカム除去時には、パイプスキマの開口部の一部が水中に位置されるので、その開口部を介してパイプスキマ内に表面水の流れ込みが開始される。この水の流れ込みにより水表面に浮遊していたスカムも一緒にパイプスキマ内に流入され、これによりスカムの除去が行われる。
　以上は、パイプスキマを備えたスカム除去装置についてであるが、パイプスキマを備えているか否かに関わらず、スカムの発生する水槽の水の流れは速くなく、例えば、水槽が汚水処理施設の沈殿池の場合、その流速は３~５ｃｍ／ｓｅｃ程度であり、したがって、スカムの発生する水槽表面の水の流れ込みだけでスカムの除去を行おうとすると、スカムの排出時間が長くなるという問題点を有している。しかも、流動性に劣るスカムの場合は、より排出時間が長くなるという問題点を有している。
　スカムの排出時間が長くなるということは、スカム排出に伴って排出される水の量が多くなることを意味している。この排出された水は、スカムを分離した後、再度、原水側に戻されるので汚水処理施設の負荷を高めてしまうという問題点も有している。
　スカムの排出を水の流れだけで行う場合は、上述のような問題点を有しているので、スカムの上方位置にスプレーノズルを設け、そのスプレーノズルから斜め下方に向けて圧力水を噴出させ、スカムに移動力を付与させることが行われている。
　しかしながら、生成されるスカムが薄膜状の場合、例えば、下水処理施設の最終沈殿池に生成する薄膜状のスカムのような場合は、スカムに圧力水が噴出されると水流に乱流を生じさせ、生成されているスカムがフロック化して水中に混入し、その水中に混入したスカムは貯水槽の下方を移動した位置で再度浮上して表面水の流れと共に排出されてしまう。このため、放流水質の低下を招来するという課題を有していた。
　そこで、本出願人は、上記課題を解決するために、特許文献１に示されるスカム除去装置を提案するとともに、このスカム除去装置に好適な特許文献２に示されるスカム除去装置用噴出ノズルを提案している。
　上記特許文献１に記載されているスカム除去装置は、パイプスキマに設けられている開口部を形成する下辺に、その開口部が水面上に位置しているときに、先端部が水面に生成されるスカムの下方に位置する深さを保って水流の上流側に所定長さ伸びる案内板を設けるとともに、その案内板の先端部位置よりも上流側の所定位置には、その開口部の一部が水中に位置したときに、その開口部に向けてスカム除去装置用噴出ノズルから水を噴出するようにしている。
　特許文献２に記載されているスカム除去装置用噴出ノズルは、スカム除去装置のパイプスキマの開口部に向けて水中から圧力水を噴出するスカム除去装置用噴出ノズルであって、そのスカム除去装置用噴出ノズル本体の開口部に、から圧力水が噴出されないときに、浮力によりその開口を閉止する閉止部材が設けられていることを特徴としている。
　上記特許文献１に記載のスカム除去装置によれば、案内板の上面側にはパイプスキマの開口部に向く流速の速い水流を生成することができ、その速い水流に同伴させてスカムをフロック化させることなく短時間で、かつ、確実にパイプスキマの開口部に移動させることができる。このため、排出される処理水質の悪化を防止することができるとともに、スカム排出に伴う水の量も少なくて済み、省エネルギー化を図ることができる。すなわち、この特許文献１係るスカム除去装置は、いわゆるエコ対策に大きく貢献することができる性質を有していて、「日一君」（登録商標）として実用に供されている。
　また、上記特許文献２に記載のスカム除去装置用噴出ノズルによれば、スカム除去装置用噴出ノズルの開口部は、そのスカム除去装置用噴出ノズル本体に圧力水が供給される時を除いて、浮力による作動する閉止部材で閉止されるから、そのスカム除去装置用噴出ノズル本体の内部がスカム等で汚損されて閉塞されることを効果的に防止することができるという特長を有している。 A conventional scum removing device, for example, a scum removing device provided with a conventional pipe gap, is installed so that the pipe gap is partially submerged in the water surface on the downstream side of the water tank in which the scum is generated. For example, if the tank is a settling basin for a sewage treatment facility such as sewage, the pipe gap will be partially submerged in front of the surface water take-out side provided on the opposite side of the settling basin from the raw water inflow side. is set up.
This conventional pipe gap is made of a pipe material having a length equal to the width of the water channel in the 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 gap is provided with a rotation mechanism that rotates around an axial center in the longitudinal direction, and is rotated so that a part of the opening is submerged in water when the scum is removed. Due to this rotation, the scum flowed into the pipe gap through the opening and was taken in.
As described above, in the scum removing device provided with the pipe gap, the scum is removed by accompanying the water stream. That is, when the scum is removed, a part of the opening of the pipe sukima is located in the water, so that the surface water starts to flow into the pipe sukima through the opening. Due to this inflow of water, the scum floating on the water surface is also flowed into the pipe gap, whereby the scum is removed.
The above is about the scum removing device equipped with a pipe gap, but regardless of whether or not the pipe gap is provided, the flow of water in the aquarium where scum is generated is not fast, for example, the water tank is settled in a sewage treatment facility. In the case of a pond, the flow velocity is about 3 to 5 cm / sec, and therefore, if the scum is removed only by the inflow of water on the surface of the water tank where scum is generated, there is a problem that the scum discharge time becomes long. doing. Moreover, in the case of scum having poor fluidity, there is a problem that the discharge time becomes longer.
The longer scum discharge time means that the amount of water discharged with the scum discharge increases. After separating the scum, the discharged water is returned to the raw water side again, which has a problem of increasing the load on the sewage treatment facility.
When the scum is discharged only by the flow of water, it has the above-mentioned problems. Therefore, a spray nozzle is provided at an upper position of the scum, and pressure water is ejected diagonally downward from the spray nozzle. , It is done to give the scum movement power.
However, when the generated scum is in the form of a thin film, for example, in the case of a thin film scum generated in the final sedimentation basin of a sewage treatment facility, when pressure water is ejected to the scum, turbulence is generated in the water flow. , The generated scum becomes a floc and is mixed in the water, and the scum mixed in the water resurfaces at the position moved below the water tank and is discharged together with the flow of the surface water. For this reason, there is a problem that the quality of discharged water is deteriorated.
Therefore, in order to solve the above problems, the applicant proposes a scum removing device shown in Patent Document 1 and a ejection nozzle for a scum removing device shown in Patent Document 2 suitable for this scum removing device. doing.
In the scum removing device described in Patent Document 1, a tip portion is generated on the water surface when the opening is located on the water surface at the lower side forming the opening provided in the pipe gap. A guide plate extending to a predetermined length is provided on the upstream side of the water flow while maintaining the depth located below the scum, and a part of the opening is provided at a predetermined position on the upstream side of the tip position of the guide plate. When the water is located in the water, water is ejected from the ejection nozzle for the scum removing device toward the opening.
The ejection nozzle for a scum removing device described in Patent Document 2 is an ejection nozzle for a scum removing device that ejects pressure water from water toward an opening of a pipe gap of the scum removing device, and is used for the scum removing device. The opening of the ejection nozzle body is characterized by being provided with a closing member that closes the opening by buoyancy when pressure water is not ejected from the nozzle.
According to the scum removing device described in Patent Document 1, a water flow having a high flow velocity toward the opening of the pipe gap can be generated on the upper surface side of the guide plate, and the scum is made to flock along with the fast water flow. It can be moved to the opening of the pipe gap in a short time and surely without causing it. Therefore, it is possible to prevent deterioration of the treated water quality to be discharged, and it is possible to reduce the amount of water associated with scum discharge and to save energy. That is, the scum removing device according to Patent Document 1 has a property that can greatly contribute to so-called eco-friendly measures, and is put into practical use as "Nichiichi-kun" (registered trademark).
Further, according to the ejection nozzle for the scum removing device described in Patent Document 2, the opening of the ejection nozzle for the scum removing device is open except when pressure water is supplied to the ejection nozzle body for the scum removing device. Since it is closed by a closing member that operates by buoyancy, it has a feature that it is possible to effectively prevent the inside of the ejection nozzle body for the scum removing device from being contaminated by scum or the like and being blocked.
特許第４９９０８５６号公報Japanese Patent No. 4990856 特許第５４４３２６０号公報Japanese Patent No. 5443260
　しかしながら、上記提案に係るスカム除去装置用噴出ノズルの閉止部材は、浮力により閉止部材を作動させて開口を閉止するようにしているので、浮力を得るために閉止部材の体積が大きくなる欠点があるとともに、その閉止部材の大形化によりスカム除去装置用噴出ノズル自体が大形化するという欠点があった。また、このスカム除去装置用噴出ノズル自体は、水中に設置されるために、水の流れに可能な限り抵抗とならない凹凸の少ない構造にすることが望まれていた。さらに案内板といった大型の機構を必要としており、複雑な構造が避けられなかった。 However, the closing member of the ejection nozzle for the scum removing device according to the above proposal has a drawback that the volume of the closing member increases in order to obtain the buoyancy because the closing member is operated by the buoyancy to close the opening. At the same time, there is a drawback that the ejection nozzle itself for the scum removing device becomes larger due to the larger size of the closing member. Further, since the ejection nozzle itself for the scum removing device is installed in water, it has been desired to have a structure having as few irregularities as possible that does not resist the flow of water as much as possible. Furthermore, a large mechanism such as a guide plate was required, and a complicated structure was unavoidable.
　本発明は上記課題を解決することを目的として成されたもので、例えば、閉止部材を大形化することなく、その閉止部材を作動させることができるスカム除去装置用噴出ノズルを提供することにある。
　係る目的を達成する一手段として例えば以下の構成を備える。即ち、スカム除去装置のパイプスキマの開口部に向けて水中から圧力水を噴出するスカム除去装置用噴出ノズルであって、前記スカム除去装置用噴出ノズル本体の開口には、そのスカム除去装置用噴出ノズル本体から圧力水が噴出されないときに、自重により回動してその開口を閉止する閉止部材が設けられていること特徴としている。
　そして例えば、前記閉止部材はスカム除去装置用噴出ノズル本体内に一端側が回動自在に軸支され、他端側にそのスカム除去装置用噴出ノズル本体の開口を閉止する閉止部を有する可動部であることを特徴としている。
　また例えば、前記可動部には重りが設けられることを特徴としている。
　さらに例えば、前記スカム除去装置のパイプスキマの開口部を形成する下辺には、その開口部が水面上に位置しているときに、先端部が水面に生成されるスカムの下方に位置する深さを保って水流の上流側に所定長さ伸びる案内板が設けられていることを特徴としている。
　また例えば、前記スカム除去装置は汚水を生物学的処理した後に沈殿分離処理する沈殿池に設けられることを特徴としている。 The present invention has been made for the purpose of solving the above problems, and for example, to provide a ejection nozzle for a scum removing device capable of operating the closing member without enlarging the closing member. is there.
For example, the following configuration is provided as one means for achieving the above object. That is, it is a scum removing device ejection nozzle that ejects pressure water from the water toward the opening of the pipe gap of the scum removing device, and the scum removing device ejecting nozzle is opened at the opening of the scum removing device ejection nozzle main body. When pressure water is not ejected from the nozzle body, a closing member that rotates by its own weight to close the opening is provided.
Then, for example, the closing member is a movable portion having a closing portion that rotatably supports one end side in the ejection nozzle body for the scum removing device and closes the opening of the ejection nozzle body for the scum removing device on the other end side. It is characterized by being.
Further, for example, the movable portion is characterized in that a weight is provided.
Further, for example, the lower side forming the opening of the pipe gap of the scum removing device has a depth at which the tip is located below the scum generated on the water surface when the opening is located on the water surface. It is characterized in that a guide plate extending to a predetermined length is provided on the upstream side of the water flow while maintaining the above.
Further, for example, the scum removing device is characterized in that it is provided in a settling basin in which sewage is biologically treated and then settled and separated.
　本発明によれば、閉止部材を大形化することなく、その閉止部材を作動させることができるスカム除去装置用噴出ノズルを提供する。 According to the present invention, there is provided a ejection nozzle for a scum removing device capable of operating the closing member without enlarging the closing member.
　図１は本発明の一実施の形態に係るスカム除去装置用噴出ノズルを備えた沈殿池の平面図である。
　図２（ａ）は、本発明の一実施の形態に係るスカム除去装置用噴出ノズルから圧力水が噴出されていないときの図１のＸ１−Ｘ１線断面図である。
　図２（ｂ）は、そのスカム除去装置用噴出ノズルから圧力水が噴出されているときの図１のＸ１−Ｘ１線断面図である。
　図３は本発明の一実施の形態に係るスカム除去装置用噴出ノズルの斜視図である。
　図４は本発明の一実施の形態に係るスカム除去装置用噴出ノズルの一部を断面で示した平面図である。
　図５（ａ）は、図４のＸ２−Ｘ２線の一部を断面で示した断面図であって、スカム除去装置用噴出ノズルから圧力水が噴出されているときを示している。
　図５（ｂ）は、その圧力水が噴出されていないときを示している。 FIG. 1 is a plan view of a settling pond provided with a ejection nozzle for a scum removing device according to an embodiment of the present invention.
Figure 2 (a) is a X 1 -X 1 line sectional view of FIG 1 when the ejection nozzles for scum removal apparatus according to an embodiment of the present invention pressurized water is not ejected.
Figure 2 (b) is a X 1 -X 1 line sectional view of FIG 1 when a pressure water is jetted from the scum removing apparatus for jetting nozzle.
FIG. 3 is a perspective view of a ejection nozzle for a scum removing device according to an embodiment of the present invention.
FIG. 4 is a plan view showing a part of the ejection nozzle for the scum removing device according to the embodiment of the present invention in cross section.
5 (a) is a sectional view showing a part of the X 2 -X 2 line in FIG. 4 in cross-section and indicates when the pressure water is ejected from the ejection nozzle scum removing apparatus.
FIG. 5B shows the time when the pressure water is not ejected.
　本発明の一実施の形態に係るスカム除去装置用噴出ノズル（以下、「噴出ノズル」という。）を説明する前に、本実施の形態の理解を深めるために、図１及び図２（ａ），（ｂ）を用いてこの噴出ノズルを備えた下水処理施設の最終沈殿池（以下、「沈殿池」という。）について説明する。
　図１に示される沈殿池１では、水は左側から右側方向へ流れるように構成されている。そしてこの沈殿池１には、周知の沈殿池１と同様に、沈降した汚泥を排出する汚泥掻取機構が設けられているが、本実施の形態の理解に直接関係しないのでその詳細説明は省略する。なお、実際の下水処理施設においては、沈殿池は複数個併設されるが、ここでは、図面を簡略化するために一個の沈殿池のみが示されている。
　図中、ａはパイプスキマであり、沈殿池１の上澄水取出部２の手前側、すなわち上澄水取出部２から所定距離上流側に一部が水没する形で、かつ、沈殿池１の水流方向と直交する方向の水路幅全体にわたって設けられている。
　このパイプスキマａの一端部（図１においては上端部）は、沈殿池１の一方の槽壁を貫通してその槽壁の外側に設けられているスカムピット３内に位置し、その開口されている一端部からスカムを含む水をスカムピット３内に排出できるように構成されている。
　そして、このパイプスキマａの他端部は、沈殿池１の他方の槽壁に回転自在に軸支され、その支軸には、パイプスキマａの軸心を中心にして回転させる回転駆動機構４が設けられている。
　なお、パイプスキマａの一端部側の槽壁を貫通する部分及び他端部側の槽壁を貫通する支軸部分は、それぞれ槽壁を軸受けとして回転できるように構成されているとともに、その軸受の機構は水密状にそれぞれ構成されていて、沈殿池１内の水が漏出しないように工夫されている。
　上記パイプスキマａは、沈殿池１の水流方向と直交する方向の水路幅よりも少し長い長さで、かつ、断面形状が円形のパイプ材Ｐからなり、そのパイプ材Ｐには、軸心方向に開口した開口部（切欠部）５が設けられている。このパイプ材Ｐの内径は、開口部５から取り入れられたスカムを含む水をスカムピット３内に速やかに流出させることができるように決められている。
　図中、７は、水面近くに設けられた圧力水供給管であって、パイプスキマａの開口部よりも所定距離上流側で、かつ、沈殿池１の水流方向と直交する方向に設けられている。そして、この圧力水供給管７には、所定間隔を保って噴出ノズルＮ，Ｎ…が連結管８を介して水中に垂下する形で設けられている。
　これら噴出ノズルＮ，Ｎ…の圧力水の噴射方向は、板状の案内板６の上面側で、かつ、パイプスキマａの開口部５の下辺側に向くように決められている。そして、噴出ノズルＮ，Ｎ…から噴出される圧力水の圧力及びその水量は、開口部５に向う水の流れを促進するに十分なように決められている。
　次に、本発明の一実施の形態に係る噴出ノズルＮについて説明する。
　沈殿池１で用いられる各噴出ノズルＮ，Ｎ…の構成は同一であるので、一つの噴出ノズルＮについて、図３~図５（ａ），（ｂ）を用いて説明する
　この噴出ノズルＮのスカム除去装置用噴出ノズル本体（以下、「ノズル本体」という。）１０の全体的形状は、薄型の箱状に形成されていて、可能な限り水流の抵抗とならないように配慮されている。そして、このノズル本体１０の平面形状は、図３及び図４に示されるように、一方側（図３及び図４において右側）は幅広となるように形成されている。
　このノズル本体１０は、一方側（幅広側）には開口１１が設けられている。したがって、この開口１１の形状をノズル本体１０の外側から見たときには、沈殿池１の水面に平行なスリット状を呈している。
　またこのノズル本体１０の他方側には、周囲にネジ溝を有する取付部１２が設けられている。この取付部１２ネジは、沈殿池１の連結管８に設けられている図示しないネジ穴に螺合できるように形成されている。したがって、この取付部１２を介してノズル本体１０を連結管８に着脱自在に取り付けることができる。
　閉止部材２０は、ノズル本体１０の一方側（幅広側）の内部に設けられている。この閉止部材２０は、可動部２１と、閉止部２２と、重り２３とを含んで構成されている。
　可動部２１は、その平面形状がノズル本体１０幅広側の内側で自由に上下動できる大きさの扁平な板材からなり、その板厚はノズル本体１０の上壁１０ａに可動部２１が当接されたとき、ノズル本体１０に設けられている開口１１の開口面積を十分に確保できるように決められている（図５（ａ）参照）。そして、この可動部２１の一端側（ノズル本体１０の開口１１の反対側）の両側には、支軸２１ａ，２１ａがそれぞれ設けられていて、これら支軸２１ａ，２１ａがノズル本体１０の上壁１０ａ近くの側壁に回動自在に設けられている。
　閉止部２２は、可動部２１の他端側（ノズル本体１０の開口１１側）の一部分を上方に折り返えす形で形成され、かつ、ノズル本体１０の開口１１の外側にほぼ当接する位置に設けられている（図５（ａ）参照）。そして、この閉止部２２の高さは、開口１１を覆えるように形成されている（図５（ｂ）参照）。
　重り２３は円盤状の鉄製からなり、閉止部２２の上面に所定の間隔を保ってビス２４を介して２個設けられている。これら重り２３は、可動部２１がノズル本体１０の上壁１０ａに当接されたとき、重り２３が上壁１０ａ内に退避できるように工夫されている（図５（ａ）参照）。
　したがって、可動部２１に重り２３が設けられていても、ノズル本体１０に設けられている開口１１の開口面積を十分に確保することができる。なお、この重り２３の重量は、ノズル本体１０に圧力水が供給されたときに可動部２１が可動できる範囲に決められている。
　上記構成からなる閉止部材２０は、圧力水供給管７から連結管８を介して噴出ノズルＮに圧力水が供給されたとき、図５（ａ）に示されるように、水圧により可動部２１が支軸２１ａ，２１ａを中心にして上方に回動させられる。これにより、閉止部２２は上方に回動し開口１１を開くことができる。
　また、圧力水供給管７から連結管８を介して噴出ノズルＮに圧力水が供給されていないときは、図５（ｂ）に示されるように、可動部２１が支軸２１ａ，２１ａを中心にして自重により下方に回動させられる。これにより、閉止部２２は下方に回動して開口１１を閉止することができる。
　なお、上記構成の閉止部材２０は、可動部２１の自重を高めるために円盤状の鉄製からなる２個の重り２３を設けているが、重りは一個の短冊状にすることも可能である。
　また、閉止部材２０自身が十分に重量を有する場合、例えば、可動部２１及び閉止部２２が鋼製の場合などのときは、重り２３を省略することも可能である。ただし、ノズル本体１０を重り２３及びビス２４を除いた部分を合成樹脂製とするときは、可動部２１の可動を確実にするために重り２３を設けることが好ましい。
　さらに、上記構成の噴出ノズルＮは、合成樹脂製として簡単に作ることができる。この場合は、閉止部材２０の組み込まれる上壁１０ａの部分を開放とし、閉止部材２０がノズル本体１０内に組み込まれた後にその開放部分が閉じられる。
　次に、上記構成からなる噴出ノズルＮを備えた沈殿池１のスカム除去動作について説明する。
　今、沈殿池１が沈殿処理を行っていて、パイプスキマａが図２（ａ）及び図５（ｂ）に示されるように、パイプスキマａの開口部５が水面上に位置していると、パイプスキマａの上流側の水面上には薄膜状のスカムＳが生成されてくる。この状態において、噴出ノズルＮは、ノズル本体１０の開口１１が閉止部材２０の閉止部２２で閉止されているので、ノズル本体１０の内部が水に含まれるスカム等で汚損されて閉塞される不都合を効果的に防止することができる。
　スカムＳの生成がある程度の面積を示した時点で、パイプスキマａは、回転駆動機構４を介してパイプスキマａの開口部５の一部分が水中に位置するように（水中に没するように）回転させられるとともに、図示しないポンプを介して圧力水供給管７に圧力水が供給される（図２（ｂ）及び図５（ａ）参照）。この圧力水の供給により、水圧で可動部２１が支軸２１ａ，２１ａを中心にして上方に回動させられる。これにより、閉止部２２は上方に回動し開口１１を開くことができる。そして、開かれた開口１０からは圧力水が噴出される（図２（ｂ）及び図５（ａ）参照）。
　したがって、噴出ノズルＮからは、パイプスキマａの開口部５に向けて圧力水が噴射され、これにより、案内板６の上面側では、開口部５に向う水の流れが促進される。そして、スカムＳは、フロック化されることなく、薄膜状を保った状態で流れの速められた水に同伴されてパイプスキマａ内に移動され、パイプスキマａの開口部５内に吸い込まれる。
　回転駆動機構４を介して開口部５の一部分を水中に位置させるように回転させるタイミング及びその水中に位置させる時間は、沈殿池１に流入する水質等によって発生するスカムＳが一様でないので実験により決められる。すなわち、装置運転の当初の数日間、一日に１回程度、手動で運転してスカムＳの排出状態を観察して決めることが望ましい。以後、その観察結果に基いて自動運転が行われる。
　しかし、自動運転の開始制御は以上の例に限定されるものではなく、沈殿池１の所定表面にスカム検出センサを配置し、このスカム検出センサ配設位置にまでスカムが充満したことを検出して、あるいは複数の各種検出センサを配して自動的にスカム除去を行うようにしても良い。
　圧力水供給管７に圧力水を供給して噴出ノズルＮからパイプスキマａの開口部５に向けて圧力水を噴射するタイミングは、開口部５の一部分を水中に位置させるタイミングに同期するように制御される。なお、パイプスキマａの開口部５の一部分を水中に位置させるタイミング及び噴出ノズルＮからパイプスキマａの開口部５に向けて圧力水を噴射するタイミングは、自動運転時に限定されるものではなく、常に手動で行うようにしてもよい。
　噴出ノズルＮに圧力水供給管７から圧力水の供給が停止されると、ノズル本体１０の開口１１は、閉止部材２０で閉止され、ノズル本体１０内部が水に含まれるスカム等で汚損されて閉塞されることが効果的に防止される。
　パイプスキマａ内に流入したスカムＳは、パイプスキマａ内を通過してスカムピット３に排出され、このスカムピット３内のスカムＳは、図示しない汚泥処理機等の処理手段により処理される。また、上澄水取出部２に排出された上澄水（処理水）は、河川等の水系に放流される。
　上記構成からなる本実施の形態に係る噴出ノズルＮを備えたスカム除去装置は、スカムＳをフロック化させることなく、かつ、速い水流に同伴させて短時間で開口部５に移動させることができるので、排出される処理水質の悪化を防止することができるとともに、スカムＳの排出に伴う水の量も少なくて済み、省エネルギー化を図ることができるという優れた効果を得ることができる。すなわち、上記構成からなるスカム除去装置は、いわゆるエコ対策に大きく貢献することができる性質を有している。
　しかも、上記構成からなる本実施の形態に係る噴出ノズルＮは、ノズル本体１０の開口１１は、スカム排出時以外は閉止部材２０で閉止され、ノズル本体１０内部が水に含まれるスカム等で汚損されて閉塞されることが効果的に防止される。また、この噴出ノズルＮの閉止部材２０は、ノズル本体１０内に設けられ、その駆動は、自重とノズル本体１０内に供給される圧力水で行われるので、ノズル本体１０を小型化できるとともに、水流に対して抵抗の小さい形とすることができる。
　以上、本発明に係る噴出ノズルについて図面を参照して詳説したが、具体的な構成は、上記実施の形態例に限定されるものではなく、本発明の要旨を逸脱しない範囲において設計変更等が可能である。
　例えば、上述の例では、パイプ材Ｐの断面形状を円形としたが、これを矩形とすることもできる。あるいは、トラフ型に適用可能なことは勿論である。水面近傍にあるスカムなどを攪拌することなく効率よく水流で移動排出させることができる。
　また、上述の例では、噴出ノズルＮを下水処理施設の最終沈殿池に適用したが、沈殿池は最初沈殿池でもよく、あるいは工場廃水用の他の沈殿池であってもよい。さらに流入渠（導水渠）に適用してもよい。さらには、有価物を浮上分離して回収する回収槽に適用することもできる。この回収槽の場合は、流体は水でない場合もあるが、本発明の「水」は、そのような流体も含んでいる。
　以上説明したように本実施の形態例のスカム除去装置用噴出ノズルは、スカム除去装置用噴出ノズル本体の開口に、そのスカム除去装置用噴出ノズル本体から圧力水が噴出されないときに、自重により回動してその開口を閉止する閉止部材が設けられているので、スカム除去装置用噴出ノズル本体自体を小型化できるとともに、そのスカム除去装置用噴出ノズル本体内部が水に含まれるスカム等によって汚損されるのを効果的に防止することができる。
　また本実施の形態例のスカム除去装置用噴出ノズルは、閉止部材がスカム除去装置用噴出ノズル本体の開口を閉止する閉止部を有する回動自在な可動部からなるので、開口の閉止を簡単に行うことができる。さらに、スカム除去装置用噴出ノズルには、可動部に重りが設けられているので、可動部の回動力をより高めることができる。
　また本実施の形態例のスカム除去装置用噴出ノズルは、パイプスキマの開口部を形成する下辺に案内板が設けられているので、スカムを効率よくパイプスキマ内に導くことができる。さらに、本実施の形態例のスカム除去装置用噴出ノズルは、スカム除去装置が汚水を生物学的処理した後に沈殿分離処理する沈殿池に設けられるので、スカムをフロック化させることなく短時間で、かつ、確実にパイプスキマ内に導くことができる。 Before explaining the ejection nozzle for a scum removing device (hereinafter, referred to as “spouting nozzle”) according to the embodiment of the present invention, in order to deepen the understanding of the embodiment, FIGS. 1 and 2 (a). , (B) will be used to describe the final settling basin (hereinafter referred to as “settling basin”) of the sewage treatment facility equipped with this ejection nozzle.
In the settling basin 1 shown in FIG. 1, water is configured to flow from the left side to the right side. Similar to the well-known settling basin 1, the settling basin 1 is provided with a sludge scraping mechanism for discharging the settled sludge, but the detailed description thereof is omitted because it is not directly related to the understanding of the present embodiment. To do. In the actual sewage treatment facility, a plurality of settling basins are installed side by side, but here, only one settling basin is shown for the sake of simplification of the drawing.
In the figure, a is a pipe gap, in which a part of the sedimentation basin 1 is submerged in front of the supernatant water extraction section 2, that is, a predetermined distance upstream from the supernatant water extraction section 2, and the water flow of the sedimentation basin 1. It is provided over the entire width of the channel in the direction orthogonal to the direction.
One end (upper end in FIG. 1) of the pipe gap a is located in a scum pit 3 provided outside the tank wall through one tank wall of the settling basin 1, and is opened. It is configured so that water containing a scum can be discharged into the scum pit 3 from one end thereof.
The other end of the pipe gap a is rotatably supported by the other tank wall of the settling basin 1, and the support shaft is a rotary drive mechanism 4 that rotates around the axis of the pipe gap a. Is provided.
The portion of the pipe gap a that penetrates the tank wall on one end side and the support shaft portion that penetrates the tank wall on the other end side are configured to be rotatable with the tank wall as a bearing, and their bearings. Each of the mechanisms is watertight, and is devised so that the water in the settling basin 1 does not leak.
The pipe clearance a is made of a pipe material P having a length slightly longer than the width of the water channel in a direction orthogonal to the water flow direction of the settling basin 1 and having a circular cross-sectional shape. An opening (notch) 5 is provided. The inner diameter of the pipe material P is determined so that the water containing the scum taken in from the opening 5 can be quickly discharged into the scum pit 3.
In the figure, reference numeral 7 denotes a pressure water supply pipe provided near the water surface, which is provided on the upstream side of a predetermined distance from the opening of the pipe gap a and in a direction orthogonal to the water flow direction of the settling basin 1. There is. The pressure water supply pipe 7 is provided with ejection nozzles N, N ... At predetermined intervals so as to hang down into the water via the connecting pipe 8.
The injection direction of the pressure water of the ejection nozzles N, N ... Is determined to be on the upper surface side of the plate-shaped guide plate 6 and on the lower side side of the opening 5 of the pipe gap a. The pressure of the pressure water ejected from the ejection nozzles N, N ... And the amount of the pressure water are determined to be sufficient to promote the flow of water toward the opening 5.
Next, the ejection nozzle N according to the embodiment of the present invention will be described.
Since the configurations of the ejection nozzles N, N ... Used in the settling basin 1 are the same, one ejection nozzle N will be described with reference to FIGS. 3 to 5 (a) and 5 (b). The overall shape of the ejection nozzle body (hereinafter referred to as "nozzle body") 10 for the scum removing device is formed in a thin box shape so as not to resist the water flow as much as possible. The planar shape of the nozzle body 10 is formed so that one side (the right side in FIGS. 3 and 4) is wide as shown in FIGS. 3 and 4.
The nozzle body 10 is provided with an opening 11 on one side (wide side). Therefore, when the shape of the opening 11 is viewed from the outside of the nozzle body 10, it has a slit shape parallel to the water surface of the settling basin 1.
Further, on the other side of the nozzle body 10, a mounting portion 12 having a screw groove is provided around the nozzle body 10. The mounting portion 12 screw is formed so as to be screwed into a screw hole (not shown) provided in the connecting pipe 8 of the settling basin 1. Therefore, the nozzle body 10 can be detachably attached to the connecting pipe 8 via the attachment portion 12.
The closing member 20 is provided inside one side (wide side) of the nozzle body 10. The closing member 20 includes a movable portion 21, a closing portion 22, and a weight 23.
The movable portion 21 is made of a flat plate material whose planar shape can freely move up and down inside the wide side of the nozzle body 10, and the plate thickness is such that the movable portion 21 is in contact with the upper wall 10a of the nozzle body 10. At that time, it is determined so that the opening area of the opening 11 provided in the nozzle body 10 can be sufficiently secured (see FIG. 5A). Support shafts 21a and 21a are provided on both sides of one end side of the movable portion 21 (opposite side of the opening 11 of the nozzle body 10), and these support shafts 21a and 21a are the upper walls of the nozzle body 10. It is rotatably provided on the side wall near 10a.
The closing portion 22 is formed so that a part of the other end side (opening 11 side of the nozzle body 10) of the movable portion 21 is folded upward, and is at a position where it substantially abuts on the outside of the opening 11 of the nozzle body 10. It is provided (see FIG. 5 (a)). The height of the closing portion 22 is formed so as to cover the opening 11 (see FIG. 5B).
The weights 23 are made of disk-shaped iron, and two weights 23 are provided on the upper surface of the closing portion 22 via screws 24 at predetermined intervals. These weights 23 are devised so that when the movable portion 21 comes into contact with the upper wall 10a of the nozzle body 10, the weight 23 can be retracted into the upper wall 10a (see FIG. 5A).
Therefore, even if the weight 23 is provided on the movable portion 21, the opening area of the opening 11 provided on the nozzle body 10 can be sufficiently secured. The weight of the weight 23 is determined within a range in which the movable portion 21 can move when pressure water is supplied to the nozzle body 10.
In the closing member 20 having the above configuration, when pressure water is supplied from the pressure water supply pipe 7 to the ejection nozzle N via the connecting pipe 8, as shown in FIG. 5A, the movable portion 21 is moved by water pressure. It is rotated upward around the support shafts 21a and 21a. As a result, the closing portion 22 can rotate upward to open the opening 11.
Further, when the pressure water is not supplied from the pressure water supply pipe 7 to the ejection nozzle N via the connecting pipe 8, the movable portion 21 is centered on the support shafts 21a and 21a as shown in FIG. 5 (b). Then, it is rotated downward by its own weight. As a result, the closing portion 22 can rotate downward to close the opening 11.
The closing member 20 having the above configuration is provided with two weights 23 made of disk-shaped iron in order to increase the weight of the movable portion 21, but the weights can also be made into a single strip.
Further, when the closing member 20 itself has a sufficient weight, for example, when the movable portion 21 and the closing portion 22 are made of steel, the weight 23 can be omitted. However, when the portion of the nozzle body 10 excluding the weight 23 and the screw 24 is made of synthetic resin, it is preferable to provide the weight 23 in order to ensure the movement of the movable portion 21.
Further, the ejection nozzle N having the above configuration can be easily manufactured as a synthetic resin. In this case, the portion of the upper wall 10a into which the closing member 20 is incorporated is opened, and the opened portion is closed after the closing member 20 is incorporated into the nozzle body 10.
Next, the scum removing operation of the settling basin 1 provided with the ejection nozzle N having the above configuration will be described.
Now, when the settling basin 1 is performing the settling treatment and the pipe gap a is located on the water surface as shown in FIGS. 2 (a) and 5 (b), the opening 5 of the pipe gap a is located on the water surface. , A thin film scum S is generated on the water surface on the upstream side of the pipe gap a. In this state, since the opening 11 of the nozzle body 10 is closed by the closing portion 22 of the closing member 20, the ejection nozzle N has the inconvenience that the inside of the nozzle body 10 is contaminated with scum or the like contained in water and is blocked. Can be effectively prevented.
When the generation of the scum S shows a certain area, the pipe gap a is set so that a part of the opening 5 of the pipe gap a is located in the water (submerged in water) via the rotation drive mechanism 4. While being rotated, pressure water is supplied to the pressure water supply pipe 7 via a pump (not shown) (see FIGS. 2 (b) and 5 (a)). By the supply of this pressure water, the movable portion 21 is rotated upward around the support shafts 21a and 21a by water pressure. As a result, the closing portion 22 can rotate upward to open the opening 11. Then, pressure water is ejected from the opened opening 10 (see FIGS. 2 (b) and 5 (a)).
Therefore, the pressure water is ejected from the ejection nozzle N toward the opening 5 of the pipe gap a, which promotes the flow of water toward the opening 5 on the upper surface side of the guide plate 6. Then, the scum S is moved into the pipe gap a along with the water whose flow has been accelerated while maintaining the thin film shape without being flocculated, and is sucked into the opening 5 of the pipe gap a.
The timing of rotating a part of the opening 5 so as to be positioned in water via the rotation drive mechanism 4 and the time for positioning the opening 5 in water are experiments because the scum S generated by the water quality flowing into the settling basin 1 is not uniform. Is determined by. That is, it is desirable to manually operate the device about once a day for the first few days of the device operation and observe and determine the discharge state of the scum S. After that, automatic operation is performed based on the observation result.
However, the start control of automatic operation is not limited to the above example, and a scum detection sensor is arranged on a predetermined surface of the settling basin 1 and it is detected that the scum is filled up to the scum detection sensor arrangement position. Alternatively, a plurality of various detection sensors may be arranged to automatically remove the scum.
The timing of supplying the pressure water to the pressure water supply pipe 7 and injecting the pressure water from the ejection nozzle N toward the opening 5 of the pipe gap a is synchronized with the timing of locating a part of the opening 5 in the water. Be controlled. The timing of locating a part of the opening 5 of the pipe gap a in water and the timing of injecting pressure water from the ejection nozzle N toward the opening 5 of the pipe gap a are not limited to those during automatic operation. You may always do it manually.
When the supply of pressure water from the pressure water supply pipe 7 to the ejection nozzle N is stopped, the opening 11 of the nozzle body 10 is closed by the closing member 20, and the inside of the nozzle body 10 is contaminated with scum or the like contained in water. Blockage is effectively prevented.
The scum S that has flowed into the pipe gap a passes through the pipe gap a and is discharged to the scum pit 3, and the scum S in the scum pit 3 is treated by a treatment means such as a sludge treatment machine (not shown). In addition, the supernatant water (treated water) discharged to the supernatant water extraction unit 2 is discharged into a water system such as a river.
The scum removing device provided with the ejection nozzle N according to the present embodiment having the above configuration can move the scum S to the opening 5 in a short time without flocking it and accompanying it with a fast water flow. Therefore, it is possible to prevent deterioration of the treated water quality to be discharged, and it is possible to obtain an excellent effect that the amount of water associated with the discharge of the scum S can be reduced and energy saving can be achieved. That is, the scum removing device having the above configuration has a property that can greatly contribute to so-called eco-friendly measures.
Moreover, in the ejection nozzle N according to the present embodiment having the above configuration, the opening 11 of the nozzle body 10 is closed by the closing member 20 except when the scum is discharged, and the inside of the nozzle body 10 is contaminated by scum or the like contained in water. It is effectively prevented from being blocked. Further, since the closing member 20 of the ejection nozzle N is provided in the nozzle body 10 and is driven by its own weight and the pressure water supplied in the nozzle body 10, the nozzle body 10 can be miniaturized and the nozzle body 10 can be miniaturized. It can be in the form of low resistance to water flow.
Although the ejection nozzle according to the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to the above-described embodiment, and design changes and the like can be made without departing from the gist of the present invention. It is possible.
For example, in the above example, the cross-sectional shape of the pipe material P is circular, but this can also be rectangular. Alternatively, it is of course applicable to the trough type. It is possible to efficiently move and discharge a scum or the like near the water surface by a water stream without stirring.
Further, in the above example, the ejection nozzle N is applied to the final settling basin of the sewage treatment facility, but the settling basin may be the first settling basin or another settling basin for factory wastewater. Further, it may be applied to an inflow culvert (leading culvert). Furthermore, it can also be applied to a recovery tank that floats, separates and collects valuable resources. In the case of this recovery tank, the fluid may not be water, but the "water" of the present invention also includes such a fluid.
As described above, the ejection nozzle for the scum removing device of the present embodiment is rotated by its own weight when pressure water is not ejected from the ejection nozzle main body for the scum removing device into the opening of the ejection nozzle main body for the scum removing device. Since a closing member that moves to close the opening is provided, the ejection nozzle body for the scum removal device itself can be miniaturized, and the inside of the ejection nozzle body for the scum removal device is contaminated by scum or the like contained in water. Can be effectively prevented.
Further, the ejection nozzle for the scum removing device of the present embodiment is composed of a rotatable movable portion having a closing portion for closing the opening of the ejection nozzle main body for the scum removing device, so that the opening can be easily closed. It can be carried out. Further, since the ejection nozzle for the scum removing device is provided with a weight in the movable portion, the rotational power of the movable portion can be further increased.
Further, since the ejection nozzle for the scum removing device of the present embodiment is provided with a guide plate on the lower side forming the opening of the pipe gap, the scum can be efficiently guided into the pipe gap. Further, since the ejection nozzle for the scum removing device of the present embodiment is provided in the settling basin where the scum removing device biologically treats the sewage and then setstles and separates the sewage, the scum is not flocculated in a short time. Moreover, it can be reliably guided into the pipe gap.
　１　　沈殿池（最終沈殿池）
　２　　上澄水取出部
　３　　スカムピット
　４　　回転駆動機構
　５　　開口部
　７　　圧力水供給管
　８　　連結管
　ａ　　パイプスキマ
　Ｐ　　パイプ材
　Ｓ　　スカム
　Ｎ　　スカム除去装置用噴出ノズル（噴出ノズル）
　１０　　スカム除去装置用噴出ノズル本体（ノズル本体）
　１０ａ　　上壁
　１１　　開口
　１２　　取付部
　２０　　閉止部材
　２１　　可動部
　２１ａ　　支軸
　２２　　閉止部
　２３　　重り
　２４　　ビス 1 Settling basin (final settling basin)
2 Supernatant water take-out part 3 Scum pit 4 Rotational drive mechanism 5 Opening 7 Pressure water supply pipe 8 Connecting pipe a Pipe gap P Pipe material S Scum N Scum removal device ejection nozzle (spouting nozzle)
10 Ejection nozzle body for scum removal device (nozzle body)
10a Upper wall 11 Opening 12 Mounting part 20 Closing member 21 Movable part 21a Support shaft 22 Closing part 23 Weight 24 Screws

Claims (4)

  1. 　スカム除去装置のパイプスキマの開口部に向けて水中から圧力水を噴出するスカム除去装置用噴出ノズルであって、
    　前記スカム除去装置用噴出ノズル本体の開口には、そのスカム除去装置用噴出ノズル本体から圧力水が噴出されないときに、自重により回動してその開口を閉止する閉止部材が設けられていることを特徴とするスカム除去装置用噴出ノズル。     A nozzle for a scum remover that ejects pressure water from water toward the opening of the pipe gap of the scum remover.
    The opening of the scum removing device ejection nozzle main body is provided with a closing member that rotates by its own weight to close the opening when pressure water is not ejected from the scum removing device ejection nozzle main body. A featured ejection nozzle for scum removal equipment.
  2. 　前記閉止部材は、スカム除去装置用噴出ノズル本体内に一端側が回動自在に軸支され、他端側にそのスカム除去装置用噴出ノズル本体の開口を閉止する閉止部を有する可動部であることを特徴とする請求項１記載のスカム除去装置用噴出ノズル。 The closing member is a movable portion having a closing portion that is rotatably supported on one end side in the ejection nozzle body for the scum removing device and has a closing portion that closes the opening of the ejection nozzle body for the scum removing device on the other end side. The ejection nozzle for a scum removing device according to claim 1.
  3. 　前記可動部には重りが設けられることを特徴とする請求項２記載のスカム除去装置用噴出ノズル。 The ejection nozzle for a scum removing device according to claim 2, wherein a weight is provided on the movable portion.
  4. 　請求項１乃至請求欧３のいずれか１項に記載のスカム除去装置用噴出ノズルを備えるスカム除去装置であって、
    　該スカム除去装置は汚水を生物学的処理した後に沈殿分離処理する沈殿池に設けられることを特徴とするスカム除去装置。     A scum removing device including the ejection nozzle for the scum removing device according to any one of claims 1 to 3.
    The scum removing device is provided in a settling basin where sewage is biologically treated and then settled and separated.
PCT/JP2020/032794 2019-08-19 2020-08-19 Discharge nozzle for scum removal device WO2021033781A1 (en)

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JPH1142293A (en) * 1997-07-25 1999-02-16 Hochiki Corp Open type water-drainage head
JP2010046622A (en) * 2008-08-22 2010-03-04 Utsunomiya Kogyo Kk Apparatus for removing scum
JP2012075609A (en) * 2010-09-30 2012-04-19 Nohmi Bosai Ltd Water spray nozzle

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