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EP0081543A1 - Procede et dispositif pour melanger un gaz a un liquide - Google Patents

Procede et dispositif pour melanger un gaz a un liquide

Info

Publication number
EP0081543A1
EP0081543A1 EP82901907A EP82901907A EP0081543A1 EP 0081543 A1 EP0081543 A1 EP 0081543A1 EP 82901907 A EP82901907 A EP 82901907A EP 82901907 A EP82901907 A EP 82901907A EP 0081543 A1 EP0081543 A1 EP 0081543A1
Authority
EP
European Patent Office
Prior art keywords
gassing
shearing
shearing device
waste water
gas
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.)
Pending
Application number
EP82901907A
Other languages
German (de)
English (en)
Inventor
Jürgen Zink
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.)
Menzel and Co GmbH
Original Assignee
Menzel and Co GmbH
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 Menzel and Co GmbH filed Critical Menzel and Co GmbH
Publication of EP0081543A1 publication Critical patent/EP0081543A1/fr
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1257—Oxidation ditches
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/203—Swing diffusers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C02F3/207—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors with axial thrust propellers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/301—Aerobic and anaerobic treatment in the same reactor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to a method for gassing a liquid, in particular wastewater, and a device for carrying out the method, wherein gas bubbles enter the liquid via a gas-permeable gassing part of a gassing unit.
  • the object of the invention is to provide a method for gassing a liquid at the beginning to improve the type described in such a way that energy savings are possible and an intensely fine-bubble gas input into the wastewater is achieved.
  • this object is achieved in that an at least partial shearing of the gas bubbles takes place via a ⁇ b shear device part when it emerges from the gassing part.
  • An advantage achieved by the invention is that the shear device part essentially shears the gas bubbles practically immediately after their formation by the shear device part due to the shear device part substantially near the gas bubble exit side of the gassing part.
  • the escaping gas is thus practically only an extremely short period of time available for gas bubbles to form.
  • the gas bubbles can therefore hardly swell and are sheared off directly from the gassing part in their development phase, so that a very fine distribution in the wastewater * is achieved.
  • FIG. 1 is a plan view of a wastewater treatment plant with a gassing unit rotating about a vertical axis
  • FIG. 2 shows a wastewater treatment plant according to FIG. 1, but with a gassing unit having a horizontal axis
  • FIG. 3 shows a side view of a gasification unit according to the invention with one-sided gas outlet
  • FIG. 5 shows a top view of the gassing unit similar to FIG. 1 in a somewhat enlarged illustration with an approximately star-shaped shearing device part
  • FIG. 6 shows a top view of a gassing unit similar to FIG. 5, but with a shearing device part having parallel parts,
  • FIG. 7 shows a plan view of a gassing unit similar to FIG. 5, but in a lattice-shaped shearing device part, - 4 -
  • FIG. 8 shows a side view of a gassing unit according to the invention with a sludge feed pipe designed as a downpipe and
  • FIG. 9 shows a side view of a gassing unit according to FIG. 8, but with a sludge feed pipe directed essentially horizontally to the rotary aerator level.
  • the wastewater treatment plant 1 shown in FIGS. 1 and 2 has a circular activation basin 3, delimited by an outer wall 2, in which half-shell-shaped wall parts 4, 5 are arranged, which are of different sizes and have a slight decrease in their end areas stood overlap so that wall openings 6 are formed.
  • the wall parts 4, 5 delimit a denitrification basin 7, in which the wastewater 8 to be treated is located, just like in the aeration basin 3.
  • a flow generator 10 designed as a propeller is arranged, which rotates about a horizontal axis and places the waste water 8 in a flow 11 indicated by arrows.
  • the gassing units 12, 13 are advantageously designed as rotary aerators and have disk-shaped gassing parts 14 which are arranged on a rotating hollow shaft 15. Atmospheric oxygen is supplied through the hollow shaft 15 and is introduced into the waste water 8 through the gassing parts 14. So that the atmospheric oxygen is also introduced into the waste water 8 in a very fine-bubble manner - -
  • a shear-off device part 16 is arranged in a plane parallel to the beta-outlet sides of the gassing parts 14. Due to the shearing device parts 16, the escaping gas bubbles are sheared very finely from the gassing part 14 in their first phase of formation, whereby only a very small, practically negligible energy requirement is required for this shearing process, so that it is both effective and cost-saving Air oxygen entry into the wastewater is possible.
  • the shearing device part 16 can also rotate. However, it is also possible to let both the gassing part 14 and the shearing device part 16 rotate and preferably to move in opposite directions with circular shearing. 1, the hollow shaft 15 of the gassing unit 12 is arranged vertically, so that the shearing movement of the gassing part 14 or the shearing device part 16 takes place in a horizontal plane rotating about a vertical axis. It can also be seen that the shearing device part of FIG. 1 has shear struts 17 arranged in a star or spoke wheel shape.
  • the shearing device part 16 which is freely rotatably mounted on the hollow shaft 15, has a flow rudder 18 which is immersed in the waste water 8 and thus stabilizes the shearing device part 16 against unintentional rotation.
  • the hollow shaft 15 of the gassing unit 13 is mounted so as to rotate about a horizontal axis 19, so that the shearing movement between the gassing parts 14 and the shearing device parts 16 is in a vertical plane
  • FIG. 2 clearly shows that on the hollow shaft 15, which is driven by a motor 20, a plurality of gassing parts 14 are arranged in a disk-shaped manner parallel to one another in the axial direction.
  • a respective shearing device part 16 is arranged between two gassing parts 14.
  • two further shear device parts 16 form the closure on both outer end faces of the gassing unit 13.
  • FIGS. 1 and 2 also illustrate that the flow 11 of the waste water 8 is advantageously directed at right angles to the direction of exit of the gas bubbles from the gassing part -14 and essentially parallel to its plane and parallel to the plane of the shearing device part 16. Since the flow generator 10 advantageously rotates about a horizontal axis, the flow course directed parallel to the shearing device part takes place essentially in the horizontal direction, which means that conditions which are largely constant or balanced are always present. In the present exemplary embodiments, the flow generator 10 is arranged upstream of the gassing units 12, 13. This means that the gassing units 12, 13 are located behind the pressure side of the flow generator 10.
  • the flow generator 10 in the flow direction behind the gassing unit 13, 12, so that the latter lies in front of the suction side of the flow generator 10.
  • the distance between the flow generator 10 and the gassing unit 12, 13 can advantageously be changed or adapted in accordance with the respective requirements, although it should be advantageous to have the gassing unit 12, 13 essentially in the region of the highest flow speeds
  • the flow generator 10 is essentially in the same plane as the aerator 12, 13.
  • the gassing units 12, 13 with the gassing parts 14 and shearing device parts 16 are located near one wall opening 6 of the denitrification basin 7 to the activation basin 3.
  • the gassing units 12, 13 are expediently designed such that - at least the gassing part 14 in the wastewater 8 is adjustable in height. It is advantageous here during a denitrification phase of the wastewater 8 to raise the gassing part 14 in the direction of the water surface to such an extent that it remains closely below the water surface, the gas bubble outlet being reduced to a minimum. It is within the scope of the invention to lift the gassing part 14 completely out of the waste water 8 and to switch off the gas supply completely. This makes it possible to ventilate the wastewater for the activated sludge to activate the microorganisms and to interrupt this phase in a single basin so that denitrification can take place over a predetermined period of time.
  • the gassing part 14 is kept close to the water surface for the denitrification phase, it is ensured that no icing occurs on the gassing part 14 even at low outside temperatures in winter, with the minimal gas supply preventing clogging of the gas outlet pores. If the gassing part 14 is raised to above the water surface, it is advantageous to provide a cover 21 (FIG. 4), which shields the gas part 14 from the outside and, with its lower edge region, advantageously plunges straight into the waste water 8. In this case, the gassing part 14 can be stopped completely.
  • the gassing part 14 may be advantageous to operate approximately in the upper two-thirds range, preferably in the upper half of the waste water 8, so that due to the low immersion depth, only a relatively low operating power is required .
  • the finest bubble ventilation is guaranteed here in any case.
  • the gassing part 14 and the foresight part 16 are preferably mounted on a vertical spindle drive
  • the gassing part 14 rotating about the axis has on its side opposite the shearing device part 16 a distributor cap 22 which distributes the ventilation gas supplied through the hollow shaft 15 evenly through the gassing part 14.
  • the shearing device part 16 is mounted on the hollow shaft 15 in a slightly free-rotating manner above the upper gas outlet side 23 of the gassing part 14.
  • the shearing device part 16 can advantageously be adjusted in the axial direction on the hollow shaft 15 in the range from 0 to about 100 mm, preferably 0 to 10 mm, so that the distance between the shearing device part 16 and the gas outlet side 23 can be regulated in this area according to the respective requirements.
  • the double arrow next to the hollow shaft 15 indicates that the gassing part 14 is height-adjustable in the waste water and can be lifted up over the water surface.
  • the gassing part 14 has, in addition to the upper and the lower gas outlet side 23, a shearing device part 16, both of which are " freely rotating on the hollow shaft 15 and are adjustable so that they can be adjusted at a distance.
  • the gassing part 14 is at present exemplary embodiment for a denitrification of the wastewater 8 has been raised so far that it is located closely above the surface 24 of the wastewater 8.
  • the gassing part 14 is covered by a covering hood 21, which has a lower edge in the wastewater 8.
  • a thermal insulation 25 is provided under the top wall of the cover 21.
  • a heating element 26 is arranged below it, which can be switched on during winter operation and prevents freezing in.
  • heating element 26 there is a shower-like sprinkling part 27, above the water can be sprayed onto the gassing part 14, so that this also ls icing can be prevented e
  • the heating element 26 and the sprinkler part 27 can be driven together or independently be ⁇ .
  • FIG. 5 shows again in a somewhat enlarged manner Representation of the schematic arrangement of the flow generator 10 and the gassing part 14 with the shearing device part 16.
  • the flow 11 is pressed against the gassing part 14 from the pressure side of the propeller-like flow generator 10.
  • the shearing device part 16 in FIG. 5 is designed in a star shape and, like a spoked wheel, has striving shearing struts 17.
  • the shearing device part has 16 'linear struts 28 which are arranged parallel to one another in the direction of the flow 11.
  • the embodiment according to FIG. 7 shows a shearing device part 16 ′′ arranged above the gassing part 14, which part is designed as a grating 29, the grating openings being large or narrow-meshed as required.
  • both the feed sludge 30 and the return sludge 31 can be introduced into the activation tank 3 in such a way that the entry takes place close to the gassing part 14.
  • • for the embodiment according to the Fig. 8 is to the elleschlam the Zu ⁇ 30 and 31-introducing sludge feed pipe 32 and run the remindlaufschlämm substantially vertical downcomer 33, which surrounds the hollow shaft 15 coaxially and a funnel-shaped enlarged Auslauf ⁇ has part 34 so that the sludge is optimally distributed.
  • the sludge is optimally distributed.
  • the sludge feed pipe 35 is arranged with its mouth close to the outer circumference of the gassing part 14 designed as a rotary aerator.
  • the inlet sludge 30 and the return sludge 31 become essentially horizontal in the plane of the disc-shaped one Fumigation part 14 introduced into the waste water.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

Dans le procédé et le dispositif pour mélanger un gaz à un liquide, notamment aux eaux résiduaires (8), les bulles de gaz parviennent dans le liquide à travers un organe de mélange (14) perméable au gaz d'un ensemble de mélange (12, 13) se trouvant dans le liquide. Pour obtenir l'introduction de bulles très fines de gaz on réalise un cisaillement au moins partiel des bulles de gaz à la sortie de l'organe de mélange (14) à l'aide d'un élément (16) de cisaillement.
EP82901907A 1981-06-20 1982-06-18 Procede et dispositif pour melanger un gaz a un liquide Pending EP0081543A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813124215 DE3124215A1 (de) 1981-06-20 1981-06-20 Verfahren und vorrichtung zum begasen einer fluessigkeit
DE3124215 1981-06-20

Publications (1)

Publication Number Publication Date
EP0081543A1 true EP0081543A1 (fr) 1983-06-22

Family

ID=6134981

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82105377A Withdrawn EP0068363A1 (fr) 1981-06-20 1982-06-18 Procédé et dispositif pour la gazéification d'un liquide
EP82901907A Pending EP0081543A1 (fr) 1981-06-20 1982-06-18 Procede et dispositif pour melanger un gaz a un liquide

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP82105377A Withdrawn EP0068363A1 (fr) 1981-06-20 1982-06-18 Procédé et dispositif pour la gazéification d'un liquide

Country Status (3)

Country Link
EP (2) EP0068363A1 (fr)
DE (1) DE3124215A1 (fr)
WO (1) WO1983000040A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3085577C (fr) * 2017-12-22 2023-08-01 Cyag Co., Ltd. Generateur de microbulles d'echelle nanometrique

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1374446A (en) * 1918-10-16 1921-04-12 William E Greenawalt Apparatus for treating liquids with gases
CH290287A (de) * 1951-05-11 1953-04-30 Kerag Kesselschmiede Apparate Verfahren zum Mischen von Gasen mit Flüssigkeiten und Einrichtung zur Durchführung dieses Verfahrens.
DE1203189B (de) * 1955-04-26 1965-10-14 Rieber Ges Mit Beschraenkter H Vorrichtung zum Belueften von Abwaessern
DE1083771B (de) * 1958-08-08 1960-06-23 Hefefabrik Weingarten G M B H Vorrichtung zur intensiven Belueftung und Begasung von Fluessigkeiten
US3630498A (en) * 1968-07-31 1971-12-28 Namco Corp Apparatus for gasifying and degasifying a liquid
CA949238A (en) * 1970-04-27 1974-06-11 John R. Mcwhirter System for gas sparging into liquid
CH613383A5 (en) * 1976-05-04 1979-09-28 Resentec Umwelttechnik Gmbh Appliance for admixing liquids with gas and/or removing foam from a liquid surface
US4290884A (en) * 1978-08-25 1981-09-22 Clevepak Corporation Nitrification-denitrification system
DE2909724C2 (de) * 1979-03-13 1984-10-25 Steinmann & Ittig GmbH & Co KG, 4950 Minden Anlage für die biologische Abwasserreinigung
US4294696A (en) * 1980-01-25 1981-10-13 Water Pollution Control Corporation Swing diffuser
GB2080276A (en) * 1980-07-25 1982-02-03 Hartley Simon Ltd The treatment of effluent by aeration
EP0047921A1 (fr) * 1980-09-15 1982-03-24 Menzel GmbH. + Co. Procédé et dispositif pour l'aération d'un liquide, particulièrement d'eau usée

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8300040A1 *

Also Published As

Publication number Publication date
EP0068363A1 (fr) 1983-01-05
WO1983000040A1 (fr) 1983-01-06
DE3124215A1 (de) 1983-01-05

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RIN1 Information on inventor provided before grant (corrected)

Inventor name: ZINK, JUERGEN