GB2268173A - Filter medium - Google Patents
Filter medium Download PDFInfo
- 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
- filter according
- 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- Withdrawn
Links
Classifications
-
- 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
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Filtering Materials (AREA)
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.
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)
| 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 |
-
1992
- 1992-06-30 GB GB9213932A patent/GB2268173A/en not_active Withdrawn
Patent Citations (11)
| 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) |