WO1987005284A1 - Procede de traitement biologique d'un liquide avec un agent oxydant et appareil de realisation dudit procede - Google Patents

Procede de traitement biologique d'un liquide avec un agent oxydant et appareil de realisation dudit procede Download PDF

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Publication number
WO1987005284A1
WO1987005284A1 PCT/SE1987/000104 SE8700104W WO8705284A1 WO 1987005284 A1 WO1987005284 A1 WO 1987005284A1 SE 8700104 W SE8700104 W SE 8700104W WO 8705284 A1 WO8705284 A1 WO 8705284A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid
medium
oxidizing medium
hood
air
Prior art date
Application number
PCT/SE1987/000104
Other languages
English (en)
Inventor
Lars Ljungkvist
Tore Nordlund
Original Assignee
Purac Ab
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 Purac Ab filed Critical Purac Ab
Publication of WO1987005284A1 publication Critical patent/WO1987005284A1/fr

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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
    • C02F3/20—Activated sludge processes using diffusers
    • 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 flocculated substance obtained when treating the sewage in the treatment with air is passed to the downstream settling tank or basin, in which it is allowed to settle to form a sludge.
  • This sludge can be recycled to the treatment tank - as return sludge - and there used to catalyse the flocculation and biochemical oxidation of the organic compounds present in the sewage water.
  • the proportion of sludge in the treatment tank is held at a relatively high level, about 10% by volume, and the tank contents are agitated in order to keep the sludge in suspension. This results in the development of active microorganisms and contributes to the effective oxidation of the contaminants.
  • the part of the sludge produced in the downstream settling tank and not cycled back to the treatment tanks for biochemical cleansing of the water is removed from the process as surplus sludge and, e.g., can be processed separately and converted to soil compost.
  • the distributing devices used in conjunction with the air injectors or sprays normally comprise porous ceramic bodies having a pore size of 0.3 mmor therebelow.
  • the object of the present invention is to provide a method of the kind described in the introduction which will enable the oxygen contant of the air supplied to be utilized to the same good extent as that achieved with embodiments of the method while at the same time substantially eliminating the intrinsic drawbacks of such embodiments.
  • the air is introduced into a pressurized chamber defined in a contact hood or the like which is held submersed in the liquid; that the liquid is vigorously whipped and/or agitated in a manner to create a wide specific reaction-surface area between liquid and air present within the hood, so as to deplete the air of oxygen? and that the depleted air is permitted to depart from the contact hood and is replaced with fresh air.
  • the air is suitably supplied to the liquid located immediately beneath the contact hood, while vigourously agitating the liquid, optionally with the aid of mechanical agitating devices, so that a wide transfer surface between air and liquid is obtained in air bubbles beneath the surface of the water and on upwardly splashing water droplets above the liquid surface located beneath the contact hood.
  • the air is supplied to the liquid located immediately beneath the liquid surface defined in the pressurized contact hood with an intensity such that the liquid is circulated through an ejector effect.
  • the arrange ⁇ ment includes a delivery conduit system which includes a pipe having provided therealong one or more ejection nozzles through which air is introduced into the liquid located beneath a pressurized chamber in the contact hood, and further comprising a return conduit system for recyc ⁇ ling air from said chamber, and a circulation fan or blower which terminates the circuit formed by the two conduit systems and which is effective for circulating air through the closed circuit.
  • a delivery conduit system which includes a pipe having provided therealong one or more ejection nozzles through which air is introduced into the liquid located beneath a pressurized chamber in the contact hood, and further comprising a return conduit system for recyc ⁇ ling air from said chamber, and a circulation fan or blower which terminates the circuit formed by the two conduit systems and which is effective for circulating air through the closed circuit.
  • blower is able to operate at a low power- input, since the only force which need be overcome is the force presented by the water c ⁇ lum present between the location at which air is introduced into the tank and the water-surface beneath the contact hood and the air resistance in the air delivery and air return conduits.
  • the reference numeral 1 designates a tank in which sewage water is treated with active sludge while supplying air to the tank.
  • the sewage to be treated is introduced into the tank 1 through an inlet 2 and is discharged from the tank through an inlet 3.
  • the sewage entering the tank through the inlet 2 has been pr ⁇ -cleansed mechanically in a conventional manner, e.g. passed through screens in order to remove from the sewage coarse, slurried contaminants such as rags, paper, fruit peel, etc.
  • the sewage together with flocculated sludge is removed from the tank and passed to a downstream or secondary settling tank (not shown) in which the sludge particles settle onto the bottom of the tank.
  • a downstream or secondary settling tank (not shown) in which the sludge particles settle onto the bottom of the tank.
  • Part of the sludge sediment is removed from the process as surplus sludge, while a further part, or the remainder of the sludge, is recycled to the tank 1 as return sludge.
  • the tank 1 will contain a relatively high proportion of sludge.
  • the return sludge contains large quantities of microorganisms, such as bacteria and protozoa, which contribute to oxidizing the contaminated constituents of the sewage water and subsequently to flocculate these constituents in the water phase.
  • air is supplied through an air delivery conduit 4 and is distributed with the aid of an ejector nozzle 5 provided at the end of the conduit.
  • the nozzle presents one or more apertures having a diameter of 10 mm, in which the air is throttled and converted to bubbles which disperse in the mixture of sewage water and active sludge.
  • the kinetic energy of the bubbles thus formed is transmitted to the mixture and causes the mixture to circulate vigourously in the tank 1 , in a closed path which includes both the upper part and the lower part of the tank 1.
  • the bubbles formed will relatively quickly enter a zone located at some distance from the nozzle exit orifices and will rise upwardly through the active sludge suspension.
  • the majority of these bubbles are captured by a contact hood 6, the open part of which faces downwardly towards the bottom of the tank in spaced relationship therewith.
  • the air deriving from the bubbles captured by the contact hood is passed from the hood 6 through a return-air conduit 7, which forms part of a circulation conduit system in which air can be circulated with the aid of a circulation fan or blower 8, and which also incorporates the delivery conduit 4.
  • the circulation system incorporating the conduits 4 and 7, the nozzle 5, and the contact hood 6, is connected to a delivery line 11 which in turn is connected to a compressed-airsource in the form of a compressor 12.
  • the air required to replace the oxygen- depleted air is supplied through the delivery conduit 11 with the aid of the compressor 12.
  • the oxidant used in the aforedescribed embodiment for treating the contaminated liquid comprises atmospharic oxygen
  • the gaseous oxygen used may be taken from air enriched in oxygen or may com ⁇ prise pure oxygen.
  • Other oxidants may also be used, e.g. ozone-containing media or optionally chlorine gas.

Landscapes

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

Abstract

Un procédé et un appareil, pour le traitement de liquides, tels que de l'eau pure et de l'eau contaminée, et plus particulièrement des eaux d'égouts, avec un agent oxydant, utilisent une hotte de contact (6) servant à établir le contact entre l'agent oxydant et le liquide. Une partie de l'agent oxydant est mise en circulation dans un système de conduites (4, 7) à l'aide d'un ventilateur ou d'une soufflante (8). Une autre partie consommée de l'agent oxydant peut quitter le système et être remplacée par un agent frais provenant d'une source (12) d'agents oxydants comprimé reliée au système de conduites (4, 7).
PCT/SE1987/000104 1986-03-04 1987-03-04 Procede de traitement biologique d'un liquide avec un agent oxydant et appareil de realisation dudit procede WO1987005284A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8600985A SE457349B (sv) 1986-03-04 1986-03-04 Anordning foer behandling av vaetskor med luft i en behandlingsbassaeng
SE8600985-9 1986-03-04

Publications (1)

Publication Number Publication Date
WO1987005284A1 true WO1987005284A1 (fr) 1987-09-11

Family

ID=20363685

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000104 WO1987005284A1 (fr) 1986-03-04 1987-03-04 Procede de traitement biologique d'un liquide avec un agent oxydant et appareil de realisation dudit procede

Country Status (3)

Country Link
EP (1) EP0262174A1 (fr)
SE (1) SE457349B (fr)
WO (1) WO1987005284A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994026400A1 (fr) * 1991-11-14 1994-11-24 Tore Nordlund Procede de melange et de traitement d'un liquide avec de l'air et moyen pour appliquer ce procede
JP2018015728A (ja) * 2016-07-28 2018-02-01 高砂熱学工業株式会社 有機性排水の処理方法および有機性排水の処理システム

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2300205A1 (de) * 1972-01-05 1973-07-26 Hitachi Ltd Vorrichtung zum in-beruehrung-bringen von gasen und fluessigkeiten
US3904525A (en) * 1973-08-23 1975-09-09 Lawrence R Rosenberg Waste treatment apparatus
DE2540845A1 (de) * 1975-09-13 1977-03-24 Messer Griesheim Gmbh Vorrichtung zum begasen von fluessigkeiten
GB1469049A (en) * 1974-04-15 1977-03-30 Houdaille Industries Inc Method of and apparatus for the dissolution of gaseous oxygen into a liquid
DE2543681A1 (de) * 1975-09-30 1977-04-07 Linde Ag Vorrichtung zur begasung von fluessigkeiten
US4107240A (en) * 1971-06-01 1978-08-15 Atlas Copco Aktiebolag Method and device for lake restoration by oxygen-enriching of the water
WO1981001700A1 (fr) * 1979-12-18 1981-06-25 Boc Ltd Procede et appareil de dissolution d'un gaz dans un liquide
CH624857A5 (en) * 1976-10-28 1981-08-31 Linde Ag Process and appliance for mixing gas into a liquid
US4486361A (en) * 1980-01-09 1984-12-04 Degremont Apparatus for introducing gas into a liquid mass

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107240A (en) * 1971-06-01 1978-08-15 Atlas Copco Aktiebolag Method and device for lake restoration by oxygen-enriching of the water
DE2300205A1 (de) * 1972-01-05 1973-07-26 Hitachi Ltd Vorrichtung zum in-beruehrung-bringen von gasen und fluessigkeiten
US3904525A (en) * 1973-08-23 1975-09-09 Lawrence R Rosenberg Waste treatment apparatus
GB1469049A (en) * 1974-04-15 1977-03-30 Houdaille Industries Inc Method of and apparatus for the dissolution of gaseous oxygen into a liquid
DE2540845A1 (de) * 1975-09-13 1977-03-24 Messer Griesheim Gmbh Vorrichtung zum begasen von fluessigkeiten
DE2543681A1 (de) * 1975-09-30 1977-04-07 Linde Ag Vorrichtung zur begasung von fluessigkeiten
CH624857A5 (en) * 1976-10-28 1981-08-31 Linde Ag Process and appliance for mixing gas into a liquid
WO1981001700A1 (fr) * 1979-12-18 1981-06-25 Boc Ltd Procede et appareil de dissolution d'un gaz dans un liquide
US4486361A (en) * 1980-01-09 1984-12-04 Degremont Apparatus for introducing gas into a liquid mass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994026400A1 (fr) * 1991-11-14 1994-11-24 Tore Nordlund Procede de melange et de traitement d'un liquide avec de l'air et moyen pour appliquer ce procede
JP2018015728A (ja) * 2016-07-28 2018-02-01 高砂熱学工業株式会社 有機性排水の処理方法および有機性排水の処理システム

Also Published As

Publication number Publication date
SE8600985D0 (sv) 1986-03-04
EP0262174A1 (fr) 1988-04-06
SE8600985L (sv) 1987-09-05
SE457349B (sv) 1988-12-19

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