US20100196165A1 - Stirring device for activated sludges - Google Patents

Stirring device for activated sludges Download PDF

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Publication number
US20100196165A1
US20100196165A1 US12/452,964 US45296408A US2010196165A1 US 20100196165 A1 US20100196165 A1 US 20100196165A1 US 45296408 A US45296408 A US 45296408A US 2010196165 A1 US2010196165 A1 US 2010196165A1
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US
United States
Prior art keywords
stirring device
stirring
flow
stirring body
circumferential boundary
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US12/452,964
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English (en)
Inventor
Marcus Hoefken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Invent Umwelt und Verfahrenstechnik AG
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Invent Umwelt und Verfahrenstechnik AG
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Application filed by Invent Umwelt und Verfahrenstechnik AG filed Critical Invent Umwelt und Verfahrenstechnik AG
Assigned to INVENT UMWELT-UND VERFAHRENSTECHNIK AG reassignment INVENT UMWELT-UND VERFAHRENSTECHNIK AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOEFKEN, MARCUS
Publication of US20100196165A1 publication Critical patent/US20100196165A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/111—Centrifugal stirrers, i.e. stirrers with radial outlets; Stirrers of the turbine type, e.g. with means to guide the flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/117—Stirrers provided with conical-shaped elements, e.g. funnel-shaped

Definitions

  • the invention relates to a stirring device for activated sludges as defined in the preamble of claim 1 .
  • Such a device is known, for example, from DE 42 18 027 A1 or DE 198 26 098 C2.
  • a hyperboloid-like stirring body is attached to a shaft.
  • a plurality of transport ribs running radially inclined are provided on the upper side of the stirring body.
  • a flow directed away from the circumferential boundary of the stirring body is generated in a liquid medium surrounding the stirring body due to its hyperboloid-like shape as well as due to the effect of the transport ribs.
  • the invention is based on the object of specifying a stirring device with improved stirring efficiency.
  • a flow guiding device which surrounds the circumferential boundary of the stirring body and which is relatively fixed thereto is provided to guide the flow generated by the stirring body in a plane running essentially vertically to the shaft. This improves the stirring efficiency in a simple and inexpensive manner.
  • the invention is based on the finding that the stirring efficiency increases with an increasing radial range of the flow directed away from the circumferential boundary of the stirring body. It has been observed that, due to the flow below the stirring body, a not insignificant suction develops which causes a backflow opposite to the flow. The backflow slows the flow and inhibits the development of a wide radial range of same.
  • the flow guiding device suggested by the invention guides the flow generated by the stirring body in a plane running essentially vertically to the shaft and counteracts in particular the formation of flow components directed inclined towards the bottom of the basin. A mutual interaction of the flow and the backflow is diminished. This can significantly improve the radial range of the flow.
  • the transport ribs usefully form a first angle of inclination of ⁇ 30° to ⁇ 90°, preferably of ⁇ 40° to ⁇ 80°, with the radial direction at least in the area of the circumferential boundary.
  • the negative sign used in front of the amount of the previously stated first angle of inclination indicates that this first angle of inclination opens in the direction opposite to the direction of rotation with respect to the radial direction.
  • the flow guiding device has an annular gap surrounding the circumferential boundary which gap is formed by lower and upper flow conducting means arranged coaxially to the shaft.
  • the flow conducting means can be flat elements, made of plastic, in particular of fiber-reinforced plastic, or also of metal, preferably of stainless steel.
  • the flow guiding device usefully forms a mounting unit.
  • the upper and lower flow conducting means can be connected to each other via means of connection.
  • the means of connection can be essentially radially running walls. The provision of such walls contributes to an improved flow guidance in the radial direction and thus further increases the range of the flow.
  • the means of connection are first inclined walls, running inclined with respect to the radial direction which form a second angle of inclination of +30° to +90°, preferably of +40° to +80°, with the radial direction.
  • the positive sign used in front of the amount of the previously stated second angle of inclination indicates that the second angle of inclination opens in the direction of rotation with respect to the radial direction.
  • the second angle of inclination is in particular selected in such a way that it is essentially directed parallel to the flow generated by the stirring body. Consequently, a diversion of the flow is avoided.
  • the radial range of the flow can thus be further improved.
  • the lower flow conducting means is a ring disk extending essentially parallel to the plane.
  • a breakthrough provided in the center of the ring disk enables the passage of the liquid medium on the bottom of the basin flowing back to the operational area of the stirring body and thus its acceleration in a radial direction pointing to the outside.
  • Support elements for support on a bottom of the basin can be provided on an underside of the lower flow means pointing away from the upper flow means such that a further annular gap is formed between the bottom and the lower flow means.
  • the further annual gap enables the essentially unhindered development of the backflow in an area below the stirring body.
  • the means of support can essentially be radially running, further walls. Such further walls provide a low flow resistance to the backflow, thus contributing to the development of a flow with an improved range.
  • the means of support are second inclined walls running inclined with respect to the radial direction which form a third angle of inclination of ⁇ 30° to ⁇ 90°, preferably of ⁇ 40° to ⁇ 80°, with the radial direction.
  • the negative sign in front of the amount of the previously stated third angle of inclination indicates in turn that this angle opens in a direction opposite to the direction of rotation of the stirring body with respect to the radial direction.
  • the suggested inclination of the second inclined walls is in particular selected so that it runs parallel to the direction of a backflow near the bottom. A diversion of the backflow is thus avoided. Consequently, the backflow is exposed to as slight a resistance as possible, whereby the radial range of the flow can in turn be increased.
  • a gap width of the annular gap running essentially parallel to the shaft expands towards the circumferential boundary of the stirring body.
  • the annular gap forms a ring nozzle with which the flow directed away from the circumferential boundary of the stirring body is not only guided in a plane essentially parallel to the bottom of the basin but is also accelerated in this plane. This significantly contributes again to the improvement of the radial range of the flow.
  • the transport ribs can bend towards the circumferential boundary from an approximately radial direction in an approximately tangential direction directed opposite the direction of rotation. Moreover, they can only extend in an outer radial section of the upper side. In this embodiment, a flow directed away from a circumferential boundary of the stirring body can be generated with a particularly high speed.
  • a plurality of essentially radially running shear ribs is provided on a further underside located opposite the upper side.
  • a height of the shear ribs can increase towards the circumferential boundary of the stirring body.
  • Such shear ribs are used to distribute the air which can be supplied in via an air supply line to the area below the stirring body. With this, the liquid medium surrounding the stirring body can not only be transported efficiently with a wide range in a radial direction but it can also be mixed with very fine air bubbles.
  • FIG. 1 a partial cross sectional view of a stirring device
  • FIG. 2 a complete cross sectional view of the stirring device in accordance with FIG. 1 ,
  • FIG. 3 a perspective view of the stirring device
  • FIG. 4 a top view of a further stirring device.
  • FIG. 1 shows a side view of a hyperboloid-like stirring body 1 which is attached to a shaft 2 .
  • Transport ribs 3 are provided on an upper side O of the stirring body 1 in a radially outer section which ribs extend up to a circumferential boundary UM.
  • the transport ribs 3 initially run in an essentially radial direction and then bend in a direction opposite the direction of rotation R in an essentially tangential direction.
  • On an underside U shear ribs 4 are provided in the vicinity of the circumferential boundary UM whose height increases in a direction pointing radially to the outside.
  • the stirring body 1 is formed from a hyperboloid-like shaped stirring body wall 5 .
  • it has a funnel-like recess 6 on its underside U.
  • the flow guiding device 7 comprises a lower ring disk 8 and a ring disk-like flow conducting element 9 located above, which is held at a distance from the ring disk 8 via radially running walls 10 .
  • An annular gap 11 is formed between the ring disk 8 and the flow conducting element 9 which surrounds the circumferential boundary UM.
  • the flow conducting element 9 is bent upward in a direction pointing towards the shaft 2 so that the annular gap 11 expands in a direction towards the circumferential boundary UM.
  • the ring disk 8 is supported via further walls 12 which are also arranged essentially radially on a bottom B of a basin (not completely shown here). A height of the further walls 12 defines a further annular gap 13 between the bottom B and the ring disk 8 .
  • the function of the stirring device is as follows:
  • a flow S pointing to the outside away from the circumferential boundary UM is generated in particular by the action of the transport ribs 3 via a rotation of the stirring body 1 in the direction of rotation R.
  • the flowing, liquid medium for example sewage sludge, waste water or similar, is forced through the annular gap 11 . Due to the diminishing cross section of the annular gap 11 , the flowing medium is accelerated. Aside from that, the flow S is forced in a direction which essentially runs parallel to the bottom B.
  • a suction is generated below the stirring body 1 which suction in turn generates a backflow RS in the opposite direction to the flow S.
  • the backflow RS which is also essentially directed parallel to the bottom B enters the flow guiding device 7 through the lower annular gap 13 and is then diverted by the action of the stirring body 1 in order to leave the annular gap 11 again with the flow S.
  • Air can be supplied to the recess 6 via an air supply line (not shown here).
  • the air supply line can extend essentially parallel to the bottom B and bend below the shaft 2 in the direction of the recess 6 .
  • the medium flowing back as per the backflow RS can be mixed with the supplied air via the shear ribs 4 while exiting through the annular gap 11 .
  • a liquid medium then exits through annular gap 11 which contains very fine air bubbles.
  • FIG. 4 shows a top view of a further stirring device.
  • Reference sign a designates a first angle of inclination which is formed between a section of the transport ribs 3 in the area of the circumferential boundary UM and a radial direction RR.
  • the first angle of inclination ⁇ is in an area from ⁇ 30° to ⁇ 90°, here approximately at ⁇ 45°.
  • the further stirring device differs from the stirring device shown in FIGS. 1 to 3 essentially in an inclination of the walls 5 as well as of the further walls 12 .
  • First inclined walls 10 a are suggested in FIG. 4 with long broken lines. They connect the flow conducting element 9 with the ring disk 8 arranged underneath. With a radial direction RR, the horizontally running first inclined walls 10 a form a second angle of inclination ⁇ of +30° to +90°, here approximately +45°.
  • Second inclined walls 12 a support the ring disk 8 against the bottom B. Together with the radial direction RR, the also horizontally arranged second inclined walls 12 a form a third angle of inclination ⁇ in the area of ⁇ 30° to ⁇ 90°, here approximately ⁇ 45°.
  • the first inclined walls 10 a run approximately vertically to the second inclined walls 12 a.
  • the flow S generated by the stirring body 1 runs approximately parallel to the first inclined walls 10 a.
  • the backflow RS runs approximately parallel to the second inclined walls 12 a.
  • an auxiliary wall 10 b can be provided in a further embodiment which wall runs parallel to the first inclined wall 10 a arranged opposite the direction of rotation R and which has a common edge with the next first inclined wall 10 a in the vicinity of the circumferential boundary UM.
  • an entry area of an annular gap section in the vicinity of the circumferential section UM corresponds approximately to an exit area of the annular gap section.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Treatment Of Sludge (AREA)
US12/452,964 2007-08-09 2008-07-18 Stirring device for activated sludges Abandoned US20100196165A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007037585.0 2007-08-09
DE102007037585 2007-08-09
PCT/EP2008/005923 WO2009018915A1 (de) 2007-08-09 2008-07-18 Rührvorrichtung für belebtschlämme

Publications (1)

Publication Number Publication Date
US20100196165A1 true US20100196165A1 (en) 2010-08-05

Family

ID=39926580

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/452,964 Abandoned US20100196165A1 (en) 2007-08-09 2008-07-18 Stirring device for activated sludges

Country Status (13)

Country Link
US (1) US20100196165A1 (es)
EP (1) EP2175973B1 (es)
JP (1) JP5307812B2 (es)
CN (1) CN101778665B (es)
AT (1) ATE510613T1 (es)
BR (1) BRPI0814951B1 (es)
DK (1) DK2175973T3 (es)
EG (1) EG25611A (es)
ES (1) ES2366873T3 (es)
IL (1) IL203596A (es)
PL (1) PL2175973T3 (es)
WO (1) WO2009018915A1 (es)
ZA (1) ZA201000605B (es)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100182869A1 (en) * 2007-08-09 2010-07-22 Invent Umwelt-Und Verfahrenstechnik Ag Stirring device for activated sludges
CN105899287A (zh) * 2013-12-11 2016-08-24 英文特环境及工艺股份公司 用于循环容纳在容器内的液体的装置
US20160279585A1 (en) * 2015-03-25 2016-09-29 Schlumberger Technology Corporation Blender for mixing and pumping solids and fluids and method of use thereof
US10130921B2 (en) * 2013-12-11 2018-11-20 Invent Umwelt—Und Verfahrenstechnik Ag Agitating member and agitating device having a plurality of segments for creating a current in a wastewater treatment basin
CN109110921A (zh) * 2018-10-09 2019-01-01 浙江海拓环境技术有限公司 一种废水反硝化脱氮反应器
US10195573B2 (en) * 2013-12-11 2019-02-05 Invent Umwelt-Und Verfaiirenstechnik Ag Stirring element having segmented configuration, for circulating wastewater in basin, and apparatus
US11786873B2 (en) 2018-08-06 2023-10-17 Invent Umwelt—Und Verfahrenstechnik Ag Submersible agitator device for circulating drinking water

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1403045B1 (it) * 2010-04-14 2013-09-27 Formest Srl Aeratore sommergibile
CN110207219A (zh) * 2018-10-18 2019-09-06 华帝股份有限公司 导流装置、应用其的风机系统以及吸油烟机
DE102019101416B4 (de) 2018-12-03 2020-07-16 Invent Umwelt- Und Verfahrenstechnik Ag Hyperboloid-Rührkörper zum Umwälzen von Flüssigkeiten sowie Rühr- und Begasungseinrichtung

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US7784769B2 (en) * 2005-04-12 2010-08-31 Invent Umwelt- Und Verfahrenstechnik Ag Agitating device and method for sewage treatment
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US2450802A (en) * 1944-11-15 1948-10-05 John E Johnson Mixer
USRE27380E (en) * 1969-06-12 1972-05-30 Flotation machine and stator therefor
US3820759A (en) * 1972-06-05 1974-06-28 Hege Avanced Syst Corp Centrifugal mixing apparatus and method
US3917763A (en) * 1972-09-05 1975-11-04 Werner Frank D Aerator
US3973759A (en) * 1973-11-26 1976-08-10 Imi(Tami) Institute For Research And Development Liquid-liquid mixer
US3882016A (en) * 1974-01-02 1975-05-06 Charles A Green Flotation machine and impeller therefor
US4551285A (en) * 1984-02-09 1985-11-05 Envirotech Corporation Flotation machine and aeration impeller
DE4218027A1 (de) * 1991-05-30 1992-12-03 Marcus Dipl Ing Hoefken Hyperboloid-ruehr- und begasungssystem zum ruehren, mischen und begasen in ein- oder mehrphasigen fluiden
US5358671A (en) * 1992-07-17 1994-10-25 Outokumpu Mintec Oy Aerator device
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US20040175268A1 (en) * 2001-04-17 2004-09-09 Raymond Charles Dow Rotary kinetic tangential pump
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US20050191174A1 (en) * 2004-02-27 2005-09-01 Ling-Zhong Zeng Centrifugal fan
US7784769B2 (en) * 2005-04-12 2010-08-31 Invent Umwelt- Und Verfahrenstechnik Ag Agitating device and method for sewage treatment
USD665047S1 (en) * 2010-02-11 2012-08-07 Invent Umwelt-Und Verfahrenstechnik Ag Stirring body

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100182869A1 (en) * 2007-08-09 2010-07-22 Invent Umwelt-Und Verfahrenstechnik Ag Stirring device for activated sludges
US8651732B2 (en) * 2007-08-09 2014-02-18 Invent Umwelt-Und Verfahrenstechnik Ag Stirring device for activated sludges
CN105899287A (zh) * 2013-12-11 2016-08-24 英文特环境及工艺股份公司 用于循环容纳在容器内的液体的装置
JP2016539798A (ja) * 2013-12-11 2016-12-22 インベント ウムウェルト− ウント フェルファーレンステヒニック アーゲー 容器に収納された液体を循環させる装置
CN105899287B (zh) * 2013-12-11 2018-02-09 英文特环境及工艺股份公司 用于循环容纳在容器内的液体的装置
US10058832B2 (en) * 2013-12-11 2018-08-28 Invent Umwelt- Und Verfahrenstechnik Ag Device for circulating a liquid received in a container having a stirring body with an aperture provided on the stirring body
US10130921B2 (en) * 2013-12-11 2018-11-20 Invent Umwelt—Und Verfahrenstechnik Ag Agitating member and agitating device having a plurality of segments for creating a current in a wastewater treatment basin
US10195573B2 (en) * 2013-12-11 2019-02-05 Invent Umwelt-Und Verfaiirenstechnik Ag Stirring element having segmented configuration, for circulating wastewater in basin, and apparatus
US20160279585A1 (en) * 2015-03-25 2016-09-29 Schlumberger Technology Corporation Blender for mixing and pumping solids and fluids and method of use thereof
US10173184B2 (en) * 2015-03-25 2019-01-08 Schlumberger Technology Corporation Blender for mixing and pumping solids and fluids and method of use thereof
US11786873B2 (en) 2018-08-06 2023-10-17 Invent Umwelt—Und Verfahrenstechnik Ag Submersible agitator device for circulating drinking water
CN109110921A (zh) * 2018-10-09 2019-01-01 浙江海拓环境技术有限公司 一种废水反硝化脱氮反应器

Also Published As

Publication number Publication date
CN101778665B (zh) 2013-01-16
JP5307812B2 (ja) 2013-10-02
ZA201000605B (en) 2010-09-29
WO2009018915A1 (de) 2009-02-12
ES2366873T3 (es) 2011-10-26
BRPI0814951B1 (pt) 2018-11-06
EP2175973A1 (de) 2010-04-21
IL203596A (en) 2013-01-31
BRPI0814951A2 (pt) 2015-01-27
EG25611A (en) 2012-03-20
CN101778665A (zh) 2010-07-14
EP2175973B1 (de) 2011-05-25
ATE510613T1 (de) 2011-06-15
PL2175973T3 (pl) 2011-10-31
JP2010535610A (ja) 2010-11-25
DK2175973T3 (da) 2011-08-29

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