GB2268173A - Filter medium - Google Patents

Filter medium Download PDF

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Publication number
GB2268173A
GB2268173A GB9213932A GB9213932A GB2268173A GB 2268173 A GB2268173 A GB 2268173A GB 9213932 A GB9213932 A GB 9213932A GB 9213932 A GB9213932 A GB 9213932A GB 2268173 A GB2268173 A GB 2268173A
Authority
GB
United Kingdom
Prior art keywords
filter
medium
composite
solids
sewage
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.)
Withdrawn
Application number
GB9213932A
Other versions
GB9213932D0 (en
Inventor
Jennifer Joan Quinn
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.)
Thames Water Authority
Original Assignee
Thames Water Authority
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 Thames Water Authority filed Critical Thames Water Authority
Priority to GB9213932A priority Critical patent/GB2268173A/en
Publication of GB9213932D0 publication Critical patent/GB9213932D0/en
Publication of GB2268173A publication Critical patent/GB2268173A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/285Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents

Abstract

The invention relates to a filter comprising a composite medium which can achieve, in sewage water to be treated, both solids removal and disinfection of the water being treated. This effect is particularly applicable in the tertiary treatment of sewage effluent requiring both "polishing" (solids/ammonia removal) and disinfection (bacteria removal) prior to discharge. Alternatively, a composite medium embodying the invention may be used as part of an advanced clean water treatment process where a filter comprising the medium would be situated downstream of a granular activated carbon filter, and/or possibly at the point of use. Such an application reduces the need for a residual chlorination system and operation in a sewage treatment works.

Description

FILTER MEDIUM The invention relates to a filter medium, particularly that used in a biologically aerated filter for sewage effluent treatment.
In the past a filter medium for sewage effluent treatment comprised sand, gravel or the like in one or more layers, with or without other layers such as carbon, particularly in activated form. Such a filter medium has to be regenerated as it rapidly becomes clogged with removed particles, which is an expensive procedure, and moreover such a medium cannot generally be used to remove bacteria in any great quantity, for which expensive chlorination or other plant is often required.
It is accordingly an object of the invention to seek to mitigate these disadvantages.
According to a first aspect of the invention there is provided a filter, comprising a composite medium having constituents wherein the composite is adapted to remove at least solids and bacteria from a fluid stream.
According to a second aspect of the invention there is provided a dual role biologically aerated filter for sewage effluent treatment, comprising a filter as hereinbefore defined.
Preferably, the composite medium may comprise a zeolite coated with a synthetic resin comprising (separate) constituents. This provides a relatively rigid and dimensionally stable medium.
The zeolite may be a natural zeolite and the synthetic resin a hydrophilic synthetic resin for example a low cross-linked poly (4-vinylpyridinium bromide).
This provides a relatively simply produced composite filter medium which not only removes solids and ammonia, but also removes bacteria such as E. coli, coliforms, salmonella and faecal strepstoccocci from a liquid such as sewage effluent passing through a filter comprising the composite medium. It is believed that bacteria are removed by being adsorbed into the surface of the composite medium because of the hydrophilic nature of the medium, the solids being trapped in the medium which has a very fine porous structure.
Also, surface electrical charge or energy assists in the entrapment of solids and ammonia ions.
The composite medium preferably comprises a mass of grains, powders or particles each of which comprises a base of natural zeolite and a coating of synthetic hydrophilic resin.
A filter medium described herein embodying the invention thus, in sewage water to be treated, can achieve both solids removal and disinfection of the water being treated. This effect is particularly applicable in the tertiary treatment of sewage effluent requiring both "polishing" (solids/ammonia removal) and disinfection (bacteria removal) prior to discharge. Alternatively, a composite medium embodying the invention may be used as part of an advanced clean water treatment process where a filter comprising the medium would be situated downstream of a granular activated carbon filter, andlor possibly at the point of use. Such an application reduces the need for a residual chlorination system and operation in a sewage treatment works.
A composite medium embodying the invention would be equally applicable in a biologically aerated filter (BAF) or a flooded filter.

Claims (7)

1. A filter, comprising a composite medium having constituents wherein the composite is adapted to remove at least solids and bacteria from a fluid stream.
2. A filter according to Claim 1, the composite medium comprising a zeolite coated with a synthetic resin.
3. A filter according to Claim 2, the resin comprising separate constituents.
4. A filter according to Claim 2 or Claim 3, the zeolite comprising a natural zeolite and the synthetic resin a hydrophilic synthetic resin for example a low cross-linked poly (4-vinylpyridinium bromide).
5. A filter according to Claim 3 or Claim 4, the composite medium comprising a mass of grains, powders or particles each of which comprises a base of natural zeolite and a coating of synthetic hydrophilic resin.
6. A filter substantially as hereinbefore described.
7. A dual role biologically aerated filter for sewage effluent treatment, comprising a filter according to any preceding claim.
GB9213932A 1992-06-30 1992-06-30 Filter medium Withdrawn GB2268173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9213932A GB2268173A (en) 1992-06-30 1992-06-30 Filter medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9213932A GB2268173A (en) 1992-06-30 1992-06-30 Filter medium

Publications (2)

Publication Number Publication Date
GB9213932D0 GB9213932D0 (en) 1992-08-12
GB2268173A true GB2268173A (en) 1994-01-05

Family

ID=10717993

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9213932A Withdrawn GB2268173A (en) 1992-06-30 1992-06-30 Filter medium

Country Status (1)

Country Link
GB (1) GB2268173A (en)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB672626A (en) * 1949-12-06 1952-05-21 Permutit Co Ltd Improvements relating to materials for rendering sea water potable
GB1043616A (en) * 1963-03-07 1966-09-21 Dow Chemical Co Coated filter aid and improved filtration method
GB1140850A (en) * 1965-02-01 1969-01-22 Fram Corp Filter element
GB1163426A (en) * 1965-09-28 1969-09-04 Kata Mfg And Filtering Co Fluid Purification Device and method of producing same
GB1373388A (en) * 1970-12-24 1974-11-13 Teijin Ltd Thermoplastic polymer fibres
GB1527753A (en) * 1974-09-26 1978-10-11 Mitsubishi Rayon Co Method of manufacturing adsorbent materials and their use in waste water purification
GB1577930A (en) * 1975-12-24 1980-10-29 Commw Scient Ind Res Org Adsorbent materials for the separation of organic substances from solution
GB2056429A (en) * 1979-08-16 1981-03-18 Takeda Chemical Industries Ltd Ion adsorbent
EP0069435A1 (en) * 1981-06-19 1983-01-12 Mitsubishi Rayon Co., Ltd. Cationic polymeric material for treating water, preparation and utilisation thereof
GB2163065A (en) * 1984-08-13 1986-02-19 Pall Corp Sorbing apparatus
WO1988009770A1 (en) * 1987-06-09 1988-12-15 Erich Busch Self-contained filter unit

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB672626A (en) * 1949-12-06 1952-05-21 Permutit Co Ltd Improvements relating to materials for rendering sea water potable
GB1043616A (en) * 1963-03-07 1966-09-21 Dow Chemical Co Coated filter aid and improved filtration method
GB1140850A (en) * 1965-02-01 1969-01-22 Fram Corp Filter element
GB1163426A (en) * 1965-09-28 1969-09-04 Kata Mfg And Filtering Co Fluid Purification Device and method of producing same
GB1373388A (en) * 1970-12-24 1974-11-13 Teijin Ltd Thermoplastic polymer fibres
GB1527753A (en) * 1974-09-26 1978-10-11 Mitsubishi Rayon Co Method of manufacturing adsorbent materials and their use in waste water purification
GB1577930A (en) * 1975-12-24 1980-10-29 Commw Scient Ind Res Org Adsorbent materials for the separation of organic substances from solution
GB2056429A (en) * 1979-08-16 1981-03-18 Takeda Chemical Industries Ltd Ion adsorbent
EP0069435A1 (en) * 1981-06-19 1983-01-12 Mitsubishi Rayon Co., Ltd. Cationic polymeric material for treating water, preparation and utilisation thereof
GB2163065A (en) * 1984-08-13 1986-02-19 Pall Corp Sorbing apparatus
WO1988009770A1 (en) * 1987-06-09 1988-12-15 Erich Busch Self-contained filter unit

Also Published As

Publication number Publication date
GB9213932D0 (en) 1992-08-12

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)