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1. WO1993015021 - DISSOLVED AIR FLOTATION

Publication Number WO/1993/015021
Publication Date 05.08.1993
International Application No. PCT/GB1993/000176
International Filing Date 28.01.1993
Chapter 2 Demand Filed 25.05.1993
IPC
B01D 24/20 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
24Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
02with the filter bed stationary during the filtration
20the filtering material being provided in an open container
B01D 36/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
36Filter circuits or combinations of filters with other separating devices
B03D 1/02 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
03SEPARATION 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
DFLOTATION; DIFFERENTIAL SEDIMENTATION
1Flotation
02Froth-flotation processes
B03D 1/24 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
03SEPARATION 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
DFLOTATION; DIFFERENTIAL SEDIMENTATION
1Flotation
14Flotation machines
24pneumatic
C02F 1/24 2006.01
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
24by flotation
C02F 1/52 2006.01
CCHEMISTRY; METALLURGY
02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
1Treatment of water, waste water, or sewage
52by flocculation or precipitation of suspended impurities
CPC
B01D 2101/02
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2101Types of filters having loose filtering material
02Carbon filters
B01D 24/205
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
24Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
02with the filter bed stationary during the filtration
20the filtering material being provided in an open container
205Downward filtration without specifications about the filter material supporting means
B01D 24/4631
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
24Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
46Regenerating the filtering material in the filter
4631Counter-current flushing, e.g. by air
B01D 36/00
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
36Filter circuits or combinations of filters with other separating devices
B03D 1/02
BPERFORMING OPERATIONS; TRANSPORTING
03SEPARATION 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
DFLOTATION; DIFFERENTIAL SEDIMENTATION
1Flotation
02Froth-flotation processes
B03D 1/028
BPERFORMING OPERATIONS; TRANSPORTING
03SEPARATION 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
DFLOTATION; DIFFERENTIAL SEDIMENTATION
1Flotation
02Froth-flotation processes
028Control and monitoring of flotation processes; computer models therefor
Applicants
  • THAMES WATER UTILITIES LIMITED [GB]/[GB] (AllExceptUS)
  • EADES, Andrew [GB]/[GB] (UsOnly)
  • STEVENSON, David, Gordon [GB]/[GB] (UsOnly)
Inventors
  • EADES, Andrew
  • STEVENSON, David, Gordon
Agents
  • JOHNSON, Terence, Leslie
Priority Data
9202153.431.01.1992GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DISSOLVED AIR FLOTATION
(FR) FLOTTATION PAR AIR DISSOUS
Abstract
(EN)
The invention relates to a liquid treatment method and apparatus for removing impurities from a liquid stream, comprising forming a zone of micro gas bubbles from a source (3) across substantially the whole surface area of a treatment vessel (12) which is situated above a filter bed (13), passing liquid to be treated into the vessel (12) above the inlet (3) for the air whereby the liquid passes in countercurrent mode through the air bubbles.
(FR)
Cette invention concerne un procédé et un appareil de traitement de liquides permettant d'éliminer les impuretés contenues dans un écoulement de liquide, consistant à former une zone de microbulles de gaz produites par une source (3) sur presque toute la zone superficielle d'une cuve (12) de traitement qui est située au-dessus d'un lit filtrant (13); on introduit le liquide devant être traité dans la cuve (12) au-dessus de l'orifice d'entrée (3) prévu pour l'air de sorte que le liquide s'écoule à contre-courant à travers les bulles d'air.
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