WO2005063630A1 - Traitement des eaux usees - Google Patents

Traitement des eaux usees Download PDF

Info

Publication number
WO2005063630A1
WO2005063630A1 PCT/GB2004/005412 GB2004005412W WO2005063630A1 WO 2005063630 A1 WO2005063630 A1 WO 2005063630A1 GB 2004005412 W GB2004005412 W GB 2004005412W WO 2005063630 A1 WO2005063630 A1 WO 2005063630A1
Authority
WO
WIPO (PCT)
Prior art keywords
waste water
particulate material
particles
density
bubbles
Prior art date
Application number
PCT/GB2004/005412
Other languages
English (en)
Inventor
Robert Yam Gwamfi Andoh
Barrie Christopher Woodbridge
Original Assignee
Hydro International Plc
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 Hydro International Plc filed Critical Hydro International Plc
Publication of WO2005063630A1 publication Critical patent/WO2005063630A1/fr

Links

Classifications

    • 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
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0042—Baffles or guide plates
    • 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
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • 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
    • B01D21/2427—The feed or discharge opening located at a distant position from the side walls
    • 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
    • B01D21/2433—Discharge mechanisms for floating particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1493—Flotation machines with means for establishing a specified flow pattern
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/02—Small separation devices for domestic application, e.g. for canteens, industrial kitchen, washing machines
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds

Definitions

  • This invention relates to the treatment of waste water, and particularly, although not exclusively, to the treatment of municipal waste water, including sewage.
  • municipal waste water undergoes a series of processes with the ultimate objective of delivering acceptably clean water that can be returned to waterways.
  • processes include primary treatment steps which physically separate solid materials from the waste water, and secondary treatment steps which causes biological separation of further matter from the waste water.
  • the primary treatment steps prefferably include one or more settling tanks in which grit and other heavy solids are removed from the bottom, while oil and large floatable solids are removed from the top.
  • the effluent from such settling tanks still contains a significant proportion of suspended solids in the form of small organic and inorganic particles which will not separate under gravity in an acceptable time.
  • ballast for example in the form of sand
  • the present invention provides a method of treating waste water by a flotation process, in which method a buoyant particulate material is added to the waste water before the flotation process.
  • the present invention provides a method of treating waste water comprising: adding a buoyant particulate material to the waste water; and generating gas bubbles within the waste water,
  • a method in accordance with the present invention may be conducted in a treatment vessel, the bubble and the particulate material, with entrained solids, forming a layer at the surface of the waste water in the vessel, which layer is continuously or periodically removed, for example by skimming.
  • the particulate material may be separated from the removed suspended solids for recycling into the inflowing waste water.
  • the gas bubbles may comprise air, and may be generated by injecting water saturated with dissolved air into the treatment vessel.
  • a flocculating agent may be added to the waste water before the waste water enters the treatment vessel.
  • the flocculating agent may comprise a polymer, for example a polyelectrolyte, such as a cationic polyelectrolyte, having a molecular weight which is preferably greater than 2 x 10 6 g/mol, and more preferably greater than 4 x 10 6 g/mol.
  • the polyelectrolyte may, for example, be a polyacrylamide or a polyamine.
  • the present invention envisages using a buoyant particulate material, that is having a density less than 1 g/cc
  • a variant of the present invention envisages the use of a particulate material which is slightly heavier than water (ie has a density greater than 1 g/cc) with buoyancy being afforded by the agglomeration of gas or air bubbles around each particle.
  • the particulate material has a density less than 0.75 g/cc, and more preferably less than 0.6 g/cc.
  • a preferred density range for the particulate material may be between 0.15 to 0.6 g/cc, and more preferably in the range 0.3 to 0.6 g/cc.
  • the particulate material may contain particles of different size. Preferably, at least 95% of the particles by volume have a size less than 150 ⁇ . A preferred particulate material has at least 95% of particles by volume less than 100 ⁇ , more preferably less than 90 ⁇ . Preferably, not more than 10% of the particles have a particle size less than 30 ⁇ , more preferably less than 20 ⁇ .
  • the particles of the particulate material are resistant to crushing.
  • a suitable particulate material is available under the name 3M Scotchlite. This material comprises bubbles of soda-lime-borosilicate glass and is available in various grades, of which grades S32, K37, S38, K46 and S60/10,000 may be suitable.
  • particulate material may be used in the practice of the present invention, for example solid or hollow plastics materials or natural mineral materials.
  • Waste water to be treated is fed by a pump 2 to a mixing chamber 4.
  • This waste water may comprise raw municipal waste water but, preferably, comprises the outflow from one or more preliminary processes, such as grit removal and bulk solids removal.
  • the waste water is thus likely to be relatively free of large solid particles, but contains very small suspended particles which are resistant to settling. These suspended solids may result in the waste water having high turbidity.
  • a flocculating agent such as a high molecular weight cationic polyelectrolyte, is added to the mixing chamber 4 on a line 6.
  • the flow rate of the flocculating agent is controlled by a valve 8.
  • the mixing chamber 4 also receives, on a line 10, a buoyant particulate material, for example in the form of glass micro spheres.
  • Mixing means is provided for agitating the waste water, the flocculating agent and the particulate material so as to achieve intimate mixing of these components before the mixture is fed, along a line 12, to a flotation vessel 14.
  • the flotation chamber 14 is provided with upper baffles 16 and lower baffles 18 to assist in generating a desired flow pattern within the flotation vessel 14.
  • An injection pump 20 supplies water saturated with air from a pressurized container 22 at a pressure of, for example, 500 kPa to injectors 24 positioned around the base of the flotation vessel 14.
  • Extraction means represented by a line 26 is provided at the top of the flotation vessel 14 for removing a froth layer 28 generated in operation.
  • This layer is in the form of a sludge which is supplied to a separator 30, for example a cyclone separator, having an outlet feeding to the line 10 for particulate material taken from the layer 28, and a sludge outlet 32 for solids material separated from the waste water in the flotation vessel 14.
  • the mixture from the mixing vessel 4 enters the flotation vessel 14.
  • the flocculating agent supplied through the line 6 causes the suspended solids in the waste water to agglomerate together, and to the individual particles of the particulate material supplied through the line 10.
  • the reduced pressure causes the dissolved air to come out of solution and to form small bubbles which rise through the flotation vessel 14. These bubbles adhere to the flocculated suspended solids and to the individual particles of the particulate material, so enhancing the buoyancy of the particles and accelerating their progress to the surface of the mixture in the flotation vessel 14.
  • This froth is removed by any suitable mechanism, for example by skimming, and conveyed along the line 26 to the separator 30.
  • the separator 30 In this separator, the remaining water and the solids formerly suspended in the incoming waste water, are stripped from the particles of the particulate material, which is then recycled along the line 10 to re-enter the mixing chamber 4.
  • the remaining sludge exits the separator 30 on the line 32, for further processing or disposal.
  • the water remaining in the lower part of the flotation vessel 14 is substantially free of suspended solids, and is drawn off on a line 34.
  • This water may be subjected to further process steps, for example UV sterilisation, or chemical or biological treatment before either passing to natural waterways or being carried away for other uses, such as irrigation or industrial or domestic use.
  • a method in accordance with the present invention may be used for purposes other than waste water treatment (for example in the mineral extraction industry). Also, in some circumstances adequate removal of suspended solids may be achieved by the addition of the particulate material alone, or in conjunction with the addition of a flocculating agent, without the addition of dissolved air.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Selon l'invention, des eaux usées, par exemple des eaux usées municipales contenant des déchets, sont traitées par un procédé qui consiste à ajouter un matériau particulaire aux eaux usées, puis à mettre en oeuvre un procédé de flottation de façon que la matière particulaire remonte à la surface des eaux usées, entraînant les matières solides dans les eaux usées. Ladite matière particulaire peut comprendre des particules flottantes, ou, si le procédé de flottation consiste à générer des bulles de gaz dans les eaux usées, des particules qui sont légèrement plus denses que l'eau mais qui flottent à mesure que les bulles de gaz s'agglomèrent sur celles-ci. Lesdites particules peuvent comprendre des bulles de verre borosilicaté sodocalcique.
PCT/GB2004/005412 2003-12-31 2004-12-31 Traitement des eaux usees WO2005063630A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0330267A GB2409677A (en) 2003-12-31 2003-12-31 Treatment of wastewater
GB0330267.6 2003-12-31

Publications (1)

Publication Number Publication Date
WO2005063630A1 true WO2005063630A1 (fr) 2005-07-14

Family

ID=31503350

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/005412 WO2005063630A1 (fr) 2003-12-31 2004-12-31 Traitement des eaux usees

Country Status (2)

Country Link
GB (1) GB2409677A (fr)
WO (1) WO2005063630A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012021402A3 (fr) * 2010-08-08 2012-05-18 Norbert Nathan Buchsbaum Procédé et appareil de purification de l'eau
US11130686B2 (en) 2017-01-10 2021-09-28 Vermeer Manufacturing Company Systems and methods for dosing slurries to remove suspended solids

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0603246D0 (en) 2006-02-17 2006-03-29 Genesis Fluid Solutions Llc Duct for use in an apparatus for separating suspended solid from water and a method feeding water having suspended solid
WO2016162060A1 (fr) * 2015-04-08 2016-10-13 Fmc Separation Systems, Bv Unité de flottation compacte
CN110899003A (zh) * 2018-09-17 2020-03-24 西南科技大学 一种新型纳米气泡可控浮选装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3637490A (en) * 1970-07-27 1972-01-25 Hercules Inc Flotation of solids from waste waters
JPS49135269A (fr) * 1973-05-04 1974-12-26
DE2748652B1 (de) * 1977-10-29 1979-01-11 Davy Bamag Gmbh Verfahren zur Entfernung von Inhaltsstoffen aus Fluessigkeiten,insbesondere Abwaessern
US5366632A (en) * 1993-03-03 1994-11-22 Minnesota Mining And Manufacturing Company Glass microbead filter and method of filtering
DE19924742A1 (de) * 1999-02-04 2000-08-10 Franz D Oeste In Flüssigkeiten gespannte, wirkstoffbeladene Fasergebilde
WO2001060494A1 (fr) * 2000-02-18 2001-08-23 The F.B. Leopold Co., Inc. Flottaison par milieux flottants solides

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2939813A1 (de) * 1979-08-29 1981-04-02 BBC AG Brown, Boveri & Cie., Baden, Aargau Flotationsverfahren zur abwasserreinigung
JP2983014B2 (ja) * 1997-06-17 1999-11-29 米實 田中 汚泥処理方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3637490A (en) * 1970-07-27 1972-01-25 Hercules Inc Flotation of solids from waste waters
JPS49135269A (fr) * 1973-05-04 1974-12-26
DE2748652B1 (de) * 1977-10-29 1979-01-11 Davy Bamag Gmbh Verfahren zur Entfernung von Inhaltsstoffen aus Fluessigkeiten,insbesondere Abwaessern
US5366632A (en) * 1993-03-03 1994-11-22 Minnesota Mining And Manufacturing Company Glass microbead filter and method of filtering
DE19924742A1 (de) * 1999-02-04 2000-08-10 Franz D Oeste In Flüssigkeiten gespannte, wirkstoffbeladene Fasergebilde
WO2001060494A1 (fr) * 2000-02-18 2001-08-23 The F.B. Leopold Co., Inc. Flottaison par milieux flottants solides

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WPI WORLD PATENT INFORMATION DERWENT, DERWENT, GB, vol. 1975, no. 36 PA - EC KAGAKU KOGYO KK PN - JP49135269 A, 26 December 1974 (1974-12-26), XP002165160 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012021402A3 (fr) * 2010-08-08 2012-05-18 Norbert Nathan Buchsbaum Procédé et appareil de purification de l'eau
US8696916B2 (en) 2010-08-08 2014-04-15 Cryodesalination, Llc Process and apparatus for water purification
US11130686B2 (en) 2017-01-10 2021-09-28 Vermeer Manufacturing Company Systems and methods for dosing slurries to remove suspended solids

Also Published As

Publication number Publication date
GB0330267D0 (en) 2004-02-04
GB2409677A (en) 2005-07-06

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