WO2019092973A1 - Réservoir de sédimentation - Google Patents

Réservoir de sédimentation Download PDF

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Publication number
WO2019092973A1
WO2019092973A1 PCT/JP2018/033469 JP2018033469W WO2019092973A1 WO 2019092973 A1 WO2019092973 A1 WO 2019092973A1 JP 2018033469 W JP2018033469 W JP 2018033469W WO 2019092973 A1 WO2019092973 A1 WO 2019092973A1
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WO
WIPO (PCT)
Prior art keywords
center well
water
tank body
center
well
Prior art date
Application number
PCT/JP2018/033469
Other languages
English (en)
Japanese (ja)
Inventor
哲 清水
守 岩▲崎▼
Original Assignee
栗田工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 栗田工業株式会社 filed Critical 栗田工業株式会社
Publication of WO2019092973A1 publication Critical patent/WO2019092973A1/fr

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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
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • 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
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
    • 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
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/08—Settling tanks with single outlets for the separated liquid provided with flocculating compartments
    • 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

Definitions

  • the present invention relates to a settling tank for settling and separating sludge, and more particularly to a settling tank in which water to be treated is supplied to the lower portion of the settling tank via a center well.
  • sedimentation separation using a solid-liquid separation tank is generally used as a means for separating the sludge mixed liquid (coagulation treatment liquid) into treated water and sludge. It is adopted.
  • a sludge zone (sludge blanket layer) is formed in the sedimentation tank in order to efficiently remove suspended solids and fine SS in the sludge mixed liquid to obtain good treated water
  • the sludge blanket filtration system is used to filter and separate suspended solids and fine SS in the sludge mixed solution by passing the sludge mixed solution from the lower part of this sludge zone through the feed well and passing through the sludge zone.
  • Patent Document 1 It is known that a plate is provided horizontally as opposed to the lower end of the center well in the central portion of the tank body as a center well type settling tank, and the flow direction of the effluent water from the center well is changed in the radial direction.
  • Patent Document 2 a cylindrical inflow portion having a diameter larger than that of the center well is formed in the upper portion of the cylindrical center well, and the water to be treated is supplied from the inflow pipe in the tangential direction of the peripheral wall of the inflow portion.
  • a swirling flow is formed along the peripheral wall, and introduced into the center well as it is, forming a downward flow while swirling in the center well, thereby preventing the occurrence of drifting when introducing the water to be treated It is disclosed to suppress the destruction of flocculated floc.
  • An object of the present invention is to provide a settling tank capable of uniformly introducing treated water into a center well.
  • the water to be treated supplied from the center well at the central portion of the tank body to the lower portion inside the tank body rises in the tank body and becomes clear water from the overflow portion at the top of the tank body.
  • a center well upper member forming an annular water channel surrounding the upper outer periphery of the center well, the center well upper member having a bottom surface extending in a spreading direction from the center well And a peripheral wall standing up from the outer peripheral edge of the bottom surface, the water to be treated is introduced into the annular water channel by the introduction member in the circumferential direction along the peripheral wall, overflowing the upper end of the center well It is characterized by flowing into the center well.
  • the upper end of the center well has a uniform height over the entire circumference.
  • the difference between the level of the overflow and the level of the upper end of the center well is 0 to 20 cm.
  • the bottom surface of the annular water channel is horizontal and located below the upper end of the center well.
  • At least the center well side of the bottom surface of the annular water channel is an inclined surface which is lowered toward the outer periphery.
  • the angle of the inclined surface with respect to the horizontal plane is 5 to 60 °.
  • a plate is provided to face the lower end of the center well to change the flow direction of water.
  • the water to be treated which has flowed into the annular water channel in the circumferential direction overflows the upper end of the center well and uniformly flows into the center well while forming a swirling flow in the annular water channel. Therefore, it is possible to prevent that the flow velocity is locally increased in the annular water channel or the center well to break the flocculated floc.
  • the height difference between the height of the upper end of the center well and the water level in the center well as low as possible, it is possible to prevent the destruction of the flocculated floc due to the impact of falling overflowed treated water on the water surface in the center well Sludge can be separated efficiently.
  • FIG. 1 and 2 show a coagulating and settling apparatus having a settling tank according to the first embodiment.
  • the tank body 1 is circular, and the center well 2 is installed at the central portion of the tank body 1.
  • the center well 2 is in the form of a cylinder whose upper and lower ends are open, and its upper end 2 t protrudes above the water surface level WL in the tank body 1.
  • This water level WL is the overflow level of the overflow weir 13 described later.
  • the upper end 2t has a uniform height over the entire circumference.
  • a center well upper 3 having a diameter larger than that of the center well 2 is provided on the top of the center well 2 as a center well upper member.
  • the center well upper 3 is connected to the upper outer peripheral surface of the center well 2 and has a flat bottom surface 3a which spreads in the horizontal direction, and a peripheral wall 3b standing up from the outer peripheral edge of the bottom surface 3a.
  • a portion surrounded by the upper portion of the center well 2, the bottom surface 3 a and the peripheral wall 3 b is an annular water channel C surrounding the upper outer periphery of the center well 2.
  • the difference (height difference) between the level of the water level WL and the level of the upper end 2t of the center well 2 is preferably 0 to 20 cm, more preferably 0 to 10 cm, particularly preferably 0 to 5 cm.
  • An introduction pipe 8 is provided as a member for introducing the water to be treated so that the water to be treated flows into the annular water passage C in the circumferential direction.
  • the end portion of the introduction pipe 8 extends along the peripheral wall 3b as shown in FIG. 2, and the water to be treated flows into the annular water channel C along the peripheral wall 3b and is swirled in the annular water channel C. , Overflows the upper end 2t of the center well 2 and flows into the center well 2.
  • the diameter of the annular water channel C (diameter of the inner peripheral surface of the peripheral wall 3b) is preferably 1.2 to 2.0 times, particularly 1.4 to 1.8 times the outer diameter of the upper end 2t of the center well 2.
  • the bottom surface 3a is horizontal.
  • the height difference between the upper end 2t and the bottom 3a is preferably 5 to 50 cm, particularly preferably 10 to 40 cm.
  • a plate 4 commonly referred to as a flat baffle is provided facing the lower end of the center well 2 to make the flow direction of the raw water from the center well 2 a radial direction.
  • the plate 4 is in the form of a horizontal disk.
  • the plate 4 is located below the lower end of the center well 2 by a predetermined distance.
  • the plate 4 and the center well 2 are coaxially arranged.
  • a later-described rake shaft 10 passes through the central portion of the plate 4, and the plate 4 is supported by the rake shaft 10.
  • the plate 4 may be supported by the center well 2 via a support member (not shown).
  • the radius of the plate 4 is not less than the radius of the center well 2 and not more than 1.5 times, preferably about 1 to 1.3 times the radius of the center well 2.
  • the bottom of the tank body 1 has a downward slope toward the center, and a pit 6 for collecting and discharging the sedimented sludge is provided at the center of the bottom.
  • the sludge in the pit 6 is discharged to the outside of the tank body 1 through the mud pipe 7.
  • the bottom surface of the tank body 1 may be horizontal.
  • a rake device is provided to rotate the rake plate 11 along the bottom surface of the tank body 1.
  • the rake apparatus includes a rake shaft 10 vertically extending through an axial center portion of the center well 2, a support arm 12 radially extending from a lower portion of the rake shaft 10, and the arm 12 And a driving device (not shown) in which the upper end of the rake shaft 10 is connected.
  • the rake plate 11 is disposed in a direction oblique to the longitudinal direction of each arm 12 so as to move the deposit on the bottom of the tank body to the center side of the bottom of the tank body when the rake rotates.
  • An overflow weir 13 is provided along the upper part of the inner peripheral wall surface of the tank body 1 as an overflow part.
  • the level at the upper end of the overflow weir 13 is the water level WL in the tank body 1.
  • the water depth of the tank body 1, ie, the height from the bottom of the tank body to the water level WL is preferably 100 to 400 cm, more preferably 100 to 250 cm.
  • the height of the upper surface of the plate 4 from the bottom of the tank body (peripheral portion of the pit 6) is 20 to 150 cm, preferably 25 to 120 cm, particularly 30 to 80 cm.
  • the downward flow velocity (LV) in the center well 2 is preferably 10 cm / sec or less, for example, about 1 to 6 cm / sec, particularly about 2 to 4 cm / sec.
  • the vertical distance between the lower end of the center well 2 and the upper surface of the plate 4 is such that the horizontal linear velocity of the raw water flowing out from this raw water outlet is about 1 to 10 cm / sec, especially about 2 to 6 cm / sec. It is preferable to set to.
  • the rising flow rate (LV) in the tank body 1 is preferably 1 m / hr or more, for example, 1 to 15 m / hr, particularly about 2 to 8 m / hr.
  • the water to be treated is supplied to the annular water channel C in the center well upper 3, swirls in the annular water channel C, overflows the upper end of the center well 2 and flows into the center well 2. And descend in the center well 2 and flow out radially between the lower end of the center well 2 and the plate 4. Thereafter, the water ascends in the tank body 1, overflows the overflow weir 13, and is discharged from the clear water outlet 14.
  • the water to be treated flows gently into the sludge blanket from the raw water outlet between the lower end of the center well 2 and the plate 4 so that the sludge is efficiently separated and separated.
  • the sludge that has settled on the bottom of the tank body 1 is scraped into the pits 6 by the lake and discharged from the sludge pipe 7.
  • the bottom surface 3a of the center well upper 3 is horizontal, but in the second embodiment shown in FIG. 3, the bottom surface 3a is an inclined surface having a downward slope toward the outer periphery. Further, in the third embodiment shown in FIG. 4, the inner peripheral side of the bottom surface 3 a, that is, the center well 2 side is an inclined surface having a downward slope toward the outer periphery.
  • the inclination angle ⁇ of this inclined surface with respect to the horizontal plane is preferably about 5 to 60 °.
  • the bottom surface 3 a is continuous with the upper end 2 t of the center well 2. However, it may be continued slightly below the upper end of the center well 2.
  • the plate 4 is horizontal, but at least the vicinity of the center may be an inclined surface less than 15 ° in the radial direction. However, at least the outer peripheral portion is preferably horizontal.
  • the tank body 1 is made into cylindrical shape, it may be square (square or more polygons). Further, the bottom surface of the tank body 1 may be horizontal.
  • the introductory pipe 8 is provided as an introductory member, you may provide a weir-like water channel as an introductory member.
  • the introduction pipe 8 is bent halfway along the peripheral wall 3 b of the center well upper 3 so that the end thereof is positioned below the surface of the annular water channel C.
  • the water flow port 8 flowing along the peripheral wall into the peripheral wall of the center well upper 3 as shown in FIG. It is preferable to provide '.
  • the center well 2 has an equal diameter from the upper end to the lower end, but the lower portion may have a large diameter.
  • the lower end may be tapered with a larger diameter.

Abstract

L'invention concerne un réservoir de sédimentation dans lequel l'eau brute provenant d'un puits central 2 vers la partie inférieure à l'intérieur du corps dudit réservoir s'élève à l'intérieur du corps 1 dudit réservoir, et devient l'eau clarifiée et s'écoule hors d'une partie de trop-plein 13 sur la partie supérieure du corps 1 dudit réservoir. Une plaque 4 pour changer la direction d'écoulement de l'eau est disposée en face de l'extrémité inférieure du puits central 2. L'eau à traiter s'écoule d'un tuyau d'entrée à un canal D'eau annulaire C dans une direction circonférentielle, tourbillonne à l'intérieur du canal d'eau annulaire C, déborde d'une extrémité supérieure 2t du puits central 2, et s'écoule dans le puits central 2.
PCT/JP2018/033469 2017-11-10 2018-09-10 Réservoir de sédimentation WO2019092973A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017217427A JP6601475B2 (ja) 2017-11-10 2017-11-10 沈殿槽
JP2017-217427 2017-11-10

Publications (1)

Publication Number Publication Date
WO2019092973A1 true WO2019092973A1 (fr) 2019-05-16

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PCT/JP2018/033469 WO2019092973A1 (fr) 2017-11-10 2018-09-10 Réservoir de sédimentation

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JP (1) JP6601475B2 (fr)
TW (1) TW201922332A (fr)
WO (1) WO2019092973A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102025700B1 (ko) * 2019-06-05 2019-09-26 효림산업주식회사 방사형 흐름을 갖는 원형 슬러지 수집기
KR102034148B1 (ko) * 2019-06-10 2019-10-18 효림산업주식회사 응집 농축 기능이 포함된 심층구조의 슬러지 수집기 및 이를 포함하는 고탁도 폐수처리시스템
CN115364530A (zh) * 2022-09-13 2022-11-22 新特能源股份有限公司 一种多晶硅渣浆沉降装置及回收系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7261690B2 (ja) * 2019-08-08 2023-04-20 ホシザキ株式会社 加熱調理器
CN112370825A (zh) * 2020-10-31 2021-02-19 江苏诺德环保工程有限公司 一种撇渣刮泥机
WO2023058339A1 (fr) * 2021-10-08 2023-04-13 メタウォーター株式会社 Dispositif de mélange et d'élimination de turbidité, et procédé de formation de flocs dans un dispositif de mélange et d'élimination de turbidité

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5059668U (fr) * 1973-09-27 1975-06-03
JPS53672U (fr) * 1976-06-23 1978-01-06
US20020121484A1 (en) * 2000-05-29 2002-09-05 Nobushige Arai Sewage disposal agent, sewage purifier, washing machine with purifier, and sewage purifying method
JP2005066533A (ja) * 2003-08-27 2005-03-17 Kurita Water Ind Ltd 沈殿槽装置
JP2017013016A (ja) * 2015-07-02 2017-01-19 株式会社東芝 沈殿槽及び沈殿処理方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5059668U (fr) * 1973-09-27 1975-06-03
JPS53672U (fr) * 1976-06-23 1978-01-06
US20020121484A1 (en) * 2000-05-29 2002-09-05 Nobushige Arai Sewage disposal agent, sewage purifier, washing machine with purifier, and sewage purifying method
JP2005066533A (ja) * 2003-08-27 2005-03-17 Kurita Water Ind Ltd 沈殿槽装置
JP2017013016A (ja) * 2015-07-02 2017-01-19 株式会社東芝 沈殿槽及び沈殿処理方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102025700B1 (ko) * 2019-06-05 2019-09-26 효림산업주식회사 방사형 흐름을 갖는 원형 슬러지 수집기
KR102034148B1 (ko) * 2019-06-10 2019-10-18 효림산업주식회사 응집 농축 기능이 포함된 심층구조의 슬러지 수집기 및 이를 포함하는 고탁도 폐수처리시스템
CN115364530A (zh) * 2022-09-13 2022-11-22 新特能源股份有限公司 一种多晶硅渣浆沉降装置及回收系统
CN115364530B (zh) * 2022-09-13 2024-04-30 新特能源股份有限公司 一种多晶硅渣浆沉降装置及回收系统

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Publication number Publication date
TW201922332A (zh) 2019-06-16
JP2019089000A (ja) 2019-06-13
JP6601475B2 (ja) 2019-11-06

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