WO2000061260A1 - Apparatus for cleaning of liquids comprising a granulated filter material - Google Patents

Apparatus for cleaning of liquids comprising a granulated filter material Download PDF

Info

Publication number
WO2000061260A1
WO2000061260A1 PCT/NO2000/000120 NO0000120W WO0061260A1 WO 2000061260 A1 WO2000061260 A1 WO 2000061260A1 NO 0000120 W NO0000120 W NO 0000120W WO 0061260 A1 WO0061260 A1 WO 0061260A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
grains
filter bed
density
grain
Prior art date
Application number
PCT/NO2000/000120
Other languages
English (en)
French (fr)
Inventor
Bjørnar Eikebrokk
Original Assignee
As Norsk Leca
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 As Norsk Leca filed Critical As Norsk Leca
Priority to EP00917501A priority Critical patent/EP1194209A1/en
Priority to CA002367516A priority patent/CA2367516A1/en
Priority to AU38461/00A priority patent/AU3846100A/en
Publication of WO2000061260A1 publication Critical patent/WO2000061260A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres

Definitions

  • filter beds When removing particles from liquids by means of deep bed filters, it is known that filter beds operates at its optimum when the efficiency of filtration, or the filter coefficient for the filter, increases in the direction of flow of the liquid, and this can be achieved by letting the filter grain size decrease in the direction of flow of the liquid through the filter bed.
  • Up- stream filtration has certain disadvantages relating to its operation, and will not be described further.
  • Downstream filterbeds are based on a combination of two- or several different filter materials with different grain size and density, such as anthrasite, silica sand and garnet sand. Normally, are one or several relatively thin support layers of coarse material situated underneath the main filter bed. The support layers are not a part of the filter bed and have no function except from keeping the filter bed in place, and to contribute to an even distribution of the backwash water, etc. and will not be further dealt with.
  • This material may be haydite or light clinker of expanded clay or plastic material with properties such as density and a grain size of the filter material can be adapted during production so that the density of the filter grains is reduced with increasing grain size.
  • a filter bed can be designed with one single raw material with substantially continuous or stepwise (stratified) gradation or size from large to smaller grains in the direction of flow of the liquid.
  • the invention is intended to encompass filter beds with the above material alone or in combination with other filter media such as sand or anthrasite.
  • the backwash (cleaning) of the filter bed can be performed with lower flushing velocities and less backwash water than what is normally used, and this is achieved by letting the filter bed comprise easily fluidised material with low density and low a sinking rate.
  • Fig. 1 shows the sinking rate of grains of various filter media, with an example of a composition of multimedia (Mehr Anlagen/multilayer) filters, where the sinking rate of the filter grains is given as a function of grain size and density.
  • Fig. 2 shows a typical deep bed filter with a granulated material according to the invention.
  • Table 1 shows an example of results after direct filtration of drinking water containing humus in two partial filters with filter beds comprising the granulated grain material of expanded clay (LK) according to the invention in two fractions of grain sizes and densitites, and a traditional two-media filter bed with anthrasite over sand (A/S) respectively.
  • the table shows that the LK filter gives results that fulfil the quality standards according to the Norwegian drinking water regulations with a good margin, and furthermore that results from the LK filter can be compared with a parallelly run traditional anthrasite sand filter in otherwise similar conditions.
  • the filter beds have the same total depth whereas the grain sizes are as follows:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)
PCT/NO2000/000120 1999-04-13 2000-04-13 Apparatus for cleaning of liquids comprising a granulated filter material WO2000061260A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00917501A EP1194209A1 (en) 1999-04-13 2000-04-13 Apparatus for cleaning of liquids comprising a granulated filter material
CA002367516A CA2367516A1 (en) 1999-04-13 2000-04-13 Apparatus for cleaning of liquids comprising a granulated filter material
AU38461/00A AU3846100A (en) 1999-04-13 2000-04-13 Apparatus for cleaning of liquids comprising a granulated filter material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO19991750 1999-04-13
NO19991750A NO314291B1 (no) 1999-04-13 1999-04-13 Kombinasjon av fraksjoner av lettklinkerkorn av ekspandert leire for tilberedning av en filterseng

Publications (1)

Publication Number Publication Date
WO2000061260A1 true WO2000061260A1 (en) 2000-10-19

Family

ID=19903197

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2000/000120 WO2000061260A1 (en) 1999-04-13 2000-04-13 Apparatus for cleaning of liquids comprising a granulated filter material

Country Status (5)

Country Link
EP (1) EP1194209A1 (no)
AU (1) AU3846100A (no)
CA (1) CA2367516A1 (no)
NO (1) NO314291B1 (no)
WO (1) WO2000061260A1 (no)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225443A (en) * 1978-03-22 1980-09-30 The Taulman Company Sintered-glass-granule filter medium
WO1981002844A1 (en) * 1980-04-04 1981-10-15 G Hirs Filter medium and method of making same
US5292436A (en) * 1992-05-13 1994-03-08 Kansas State University Research Foundation Tapered bed filtration apparatus
WO1997046493A1 (en) * 1996-06-07 1997-12-11 Rc Enwa A/S A method and a device for the purification of fluids
WO1998015349A1 (en) * 1996-10-07 1998-04-16 A.S Norsk Leca Light expanded clay aggregates for phosphorus removal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4225443A (en) * 1978-03-22 1980-09-30 The Taulman Company Sintered-glass-granule filter medium
WO1981002844A1 (en) * 1980-04-04 1981-10-15 G Hirs Filter medium and method of making same
US5292436A (en) * 1992-05-13 1994-03-08 Kansas State University Research Foundation Tapered bed filtration apparatus
WO1997046493A1 (en) * 1996-06-07 1997-12-11 Rc Enwa A/S A method and a device for the purification of fluids
WO1998015349A1 (en) * 1996-10-07 1998-04-16 A.S Norsk Leca Light expanded clay aggregates for phosphorus removal

Also Published As

Publication number Publication date
CA2367516A1 (en) 2000-10-19
NO991750D0 (no) 1999-04-13
NO991750L (no) 2000-10-16
EP1194209A1 (en) 2002-04-10
NO314291B1 (no) 2003-03-03
AU3846100A (en) 2000-11-14

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