GB2360225A - Filament filter for liquids - Google Patents
Filament filter for liquids Download PDFInfo
- Publication number
- GB2360225A GB2360225A GB0006172A GB0006172A GB2360225A GB 2360225 A GB2360225 A GB 2360225A GB 0006172 A GB0006172 A GB 0006172A GB 0006172 A GB0006172 A GB 0006172A GB 2360225 A GB2360225 A GB 2360225A
- Authority
- GB
- United Kingdom
- Prior art keywords
- monofilaments
- solid
- filaments
- filtering
- band
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 42
- 238000001914 filtration Methods 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims abstract description 4
- 229920003023 plastic Polymers 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims abstract 4
- 238000000034 method Methods 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 18
- 238000005406 washing Methods 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 238000011001 backwashing Methods 0.000 abstract description 17
- 239000010865 sewage Substances 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 12
- 239000011148 porous material Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000004760 aramid Substances 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000005374 membrane filtration Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001494 Technora Polymers 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000004950 technora Substances 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/10—Brush filters ; Rotary brush filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Filtration Of Liquid (AREA)
Abstract
A filter assembly for filtering liquid comprises a thick band of filaments 7, means 10 (11, Fig 2) for fixing one end of said band and a support 4 for keeping said band in the desired filtering position. The filaments are preferably 0.3 mm or less in diameter and made of plastics, carbon fibre or metal. The filaments are able to move between a filtering position (Fig 1), and a cleaning position (Fig 4). The band may be made up of filaments of different diameters (8, 9, Fig 3). The means for fixing the band preferably comprises a rod 10 and sleeve clip 11. The support 4 is preferably a grill or wire screen, whose mesh is not larger than the thickness of the filaments. The support is preferably part of a frame 1 with an upper lid 2 provided with a fitting 6 for detachably connecting a drawing pipe 5, and lower lid 3. Back-washing of the filter assembly may be conducted during the filtration process by supplying back-washing water A against the liquid flow. The filtering assembly may be used for sewage or waste water filtering.
Description
2360225 SOLID-LIQUID FILTER1NG METHOD AND SYSTEM FOR SEWAGE, WASTE WATER
AND THE LIKE
BACKGROUND OF THE INVENTION Field of the Invention
This invention relates to a solid-liquid filtering method and system for sewage, waste water and the like. Prior Art
According to a conventional solid-liquid filtering process, solid containing liquid has been filtered off through porous filter media such as woven fabric, gauze or mesh, knitted fabric, penetrable membrane and the like. Liquid to be filtered is passed through a filter medium from one side to be other side thereof by loading, pressing, evacuating, centrifuging and the like, thereby solid being captured by pores if the solid particle is Larger than the pore size.
In the conventional system for conducting the abovementioned filtering process, the liquid is basically forced to pass through a filter from one side to the other. Average solid particle size in the liquid varies depending on kinds of liquid to be filtered while each filter medium has its inherent pore size fallen in a certain range. When the liquid contains solid of various particle sizes, it is necessary to change filter media with an increase or decrease in the particle size. Further, the liquid to be filtered is restricted by a specific filtering system if its filter medium is not changed, which inconveniently reduced applicability of the filtering system.
Filtered solid particles are gradually accumulated on the filter media with the elapse of filtering process to cause clogging of the filter. Such a clogging situation decreases the filtering effect and finally halts filtration. As the liquid is forced to pass through the filter media as described above, solid is strongly captured by filter pores. The finer the solid particle becomes, the more frequently such clogging occurred.
It is not economical, efficient nor practical from an operational standpoint to use a filter medium to its filtering capacity because such a medium is no longer reusable. For thatreason, clogged filter media are usually washed to remove filtered off solid particles and reused repeatedly. In order to solve problems caused by clogging, a fixed filter medium is subjected to so-called back washing by forcibly passing washwater through the medium in the backward direction, or clogged solid particles are forcibly blown offer sucked out by means of a conventional device.
Although back-washing is a simple and convenient treatment for clogging, such a treatment should be conducted at a high water pressure by using a large amount of water for a long period of time when pore size of the filter medium is considerably small, or when solid particles are excessively fine or adhere strongly to the medium. The filter medium is sometimes used continuously even under an inefficient condition as described above, or a washing period should be shortened unavoidably.
On the other hand, an application of a specific device for washing would increase the production cost and decrease the operational efficiency.
According to the present invention, it is possible to - 1) - filter off solid of normal to superfine particles through a novel type of filter media which can be easily and completely washed by conventional back-washing. The present invention provides a novel solid-liquid filtering method and system which exceeds the conventional concept of filtration.
SUMMARY OF THE INVENTION
Various aspects of the invention are defined are herein and in the claims.
In one aspect, the invention provides a solid-liquid filtering method in which liquid to be filtered is passed through a thick band of assembled filaments to filter off and capture solid by supplying liquid in the direction of filament retainnient, said band comprising closely paralleled monofillaments of predetermined length, one end portion of which being fixed and the other end portion being floated so as to keep said band in a plane situation at proper location by a support only when each filament is forced to turn in a regular direction.
In another aspect, the invention provides a solid-liquid filtering means which comprises a thick band of assembled filaments prepared by closely arranging paralleled monofilaments of predetermined length, a means for fixing one end portion of said band and a network support for keeping said band in a plane situation at proper location when said band in a plane situation at proper location when said band is forced to turn in a regular direction, one end portion of said monofilaments being fixed and the other end portion being floated.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a perspective view of the present solid-liquid filtering system.
Fig. 2 is a perspective view of a filter medium of the present solidliquid filtering system.
Fig. 3 is a partially enlarged side view of a short side portion of the filter medium shown in Fig. 2 (taken on line IIIIII in Fig. 2).
Fig. 4 is a schematic sectional view of the present solid-liquid filtering system under a back-wash condition.
Fig. 5 is a schematic illustration of a solid-liquid filtering system according to another embodiment of the present invention.
DETAILED DESCRIPTION AND THE PREFERRED EMBODIMENTS
According to the present invention, gaps are formed between each contact surface of closely paralleled neighboring monofilaments, which function as pores formed on conventional filter media.
A filtering surface can be controlled by changing diameter of monofilaments, and thus, thickness thereof may be selected depending on particle size of solid to be filtered off.
Fine filtration comparable to membrane- or ultrafiltration can be conducted by means ultrafine monofilaments.
The above mentioned filter medium of novel type allows to easily induct high-level filtration, while back-washing thereof is also carried out quite simply and completely. As only one side portion of monofilaments is fixed, the other side portion is released from a network support by backwashing water which is supplied in the backward direction against a flow of filtrate, while the washing water allows the filaments to forcibly float and spread therein. As distance between each filtering surface is forced to spread by the washing water, solid particles captured on a band of assembled filaments during the filtration process are released the therefrom without difficulty, thereby the filter medium being regenerated easily.
As decried above, the present filtering method and system makes it possible to wash and regenerate the filter medium quite easily and completely in any case by conventional backwashing while the level of membrane- or ultrafiltration can be kept.
Monofilaments used by the present invention may be those filaments made of conventional materials preferably including plastics, carbon fiber, metal fiber and the like, although there should be selected a specific materials suitable for properties of liquid to be filtered as a matter of course.
Thickness of monofilaments is not in particular limited by the present invention, but excessively thick filaments decrease the operational efficiency because of less contact surface formed between them and are not suitable for conducting high-level filtration of the present invention. The monofilaments are preferably 0.3 mm or less in diameter for the purpose of conducting high-level filtration of the present invention, although the operational efficiency increases much more with a decrease in thickness of the monofilaments.
Further, a network support for the band of assembled monofilaments is not restricted by the present invention except some technical practices such as that a mesh thereof is not larger than thickness of the monofilaments to prevent an intrusion thereof into the network, the support is made of materials resistant to liquid to be filtered and the like.
According to the present invention the filter medium is washed and regenerated by simply supplying back-washing water in the backward direction against the liquid flow, which minimizes technical and economical inconveniences caused by back-washing. A step of back-washing can be repeatedly conducted during the filtration process without the consideration loss of efficiency. In other words, such an intermittent introduction of back-washing step does not affect the filtration process seriously. One of the most characteristic feature of the present invention resides in the simple and complete back-washing.
The hand of assembled monofilaments is effectively used in the present invention as a novel type of filter medium as described above and also functions as a butterfly valve which is conventionally used in similar methods and systems.
It is theoretically possible to fix both ends of a filter medium during the filtration process, release one of these ends in the subsequent backwashing step and then fix it again to continue further filtration. Such a process, however, is not practical and contrary to the spirit of t_he present invention. EMBODIMENTS Referring now to the drawings, the present invention will be further described by the following embodiments.
Fig. 1 is a perspective view of the present solid-liquid filtering system, Fig. 2 is a perspective view of a filter medium of the present solidliquid filtering system, and Fig. 3 is a partially enlarged side view of a short side portion of the filter medium shown in Fig. 2 (taken on line III-III in Fig. 2). In Fig. 1, a series of bands of assembled monofilaments are partially taken off for better understanding.
1 designates a cylindrical basket-like frame made of stainless steel as a part of the present system. The frame 1 is about 450 mm in length and about 140 mm in diameter. The frame 1 is provided with sealing lids 2 and 3 made of stainless steel on the top and bottom opening and a stainless wire screen 4 of about 1 cm mesh stretched thereon. The upper lid 2 is provided with a fitting 6 for detachably connecting an drawing pipe 5.
7 designates a filter medium. As shown,in Figs. 2 and 3, the filter medium 7 comprises an inner layer of about 1.5 mm thickness prepared by closely assembling aramid fibers 8 (TECHNORA, TEIJIN LIMITED, trademark) of about 150 mm in length and about 0.012 mm in diameter prepared by closely assembling aramid monofilaments and folding them into two to form a layer of about 1.5 mm in thickness as a whole, an outer layer of about 0.5 mm in thickness prepared by arranging polypropylene monofilaments 9 of about 0.3 mm in diameter on the inner layer, a stainless rod 10 of about 470mm in length for holding the center of both monofilaments layers, and a sleeve clip 11 for fixing these layers on the rod 10, the thickness of the filter medium 7 being about 2.5 mm as a whole. Thicker monofilaments of the outer layer are used to settle the inner layer of thinner monofilaments as an essential filter medium and do not contribute to filtration directly. Accordingly, the outer layer is not necessarily essential to the present filtering system. Measure of the filter medium 7 is about 450 mm in length, about 70 mm in width and about 2.5 mm in thickness.
Nine filter media 7 are mounted on a wire screen 4 stretched around a cylindrical basket-like frame 1 so that respective free end portions of these media 7 overlap the adjacent sleeve-clipped end portions each other as shown in Fig. 1. Overlapped width shown by "a" in Fig. 1 is about 20 mm. Each of stainless 10 is fitted in the periphery of top and bottom lids 2 and 3 of the frame 1. In this case, each of the filter media 7 is rotatable around the stainless rod 10 as a rotating shaft. The filter media 7 may be fixed to the frame 1 so that the media as a whole are not rotatable but only monofilaments are free and floatable.
The present filtering system of the above-mentioned structure is almost in an airtight situation by means of the filter media 7 and the top and bottom lids 2 and 3 except the fitting 6, and is completely sealed when the drawing pipe 5 is connected thereto.
A filtering method of the present invention using the above-mentioned system will be described in the following.
After the drawing pipe 5 was fitted to the fitting 6, the filtering system was immersed in a stirred 30,000 ppm-mountain soil suspension in water. The drawing pipe 5 was connected to a small sized 8 liter/min. duty-suction pump to conduct filtration under a vacuum condition. The suspension was subjected to filtration at a filtering rate of 2.0 to 3.0 liter/min. and yielded considerably clear water.
The first filtering step was discontinued after ten minutes-filtration, while the filter media 7 were back-washed for one minute by flowing water in the backward direction against the flow of filtering liquid. Such a combined process of ten minutesfiltration followed by one minute-back-washing was repeated continuously. As a result, clear water as a filtrate was obtained at a filtering rate of 110 to 160 liter/hour or about 3,200 liter/day.
When back-washing water (tap water) A was violently passed through the filtering system from inside to outside thereof, monofilaments of the filter media 7 were released from outward of the wire screen 4 floated in the water.as shown in Fig. 4, which was then entrapped into irregular gaps between each monofilament to remove filtered solid accumulated thereon and regenerate the filter media 7 completely.
Another embodiment of the present invention is shown in Fig. 5. Each filter medium 7 is flatly arranged on and fixed to one side portion ot a chamber. According to this embodiment, effective suction filtration and back-washing are conducted by supplying liquid to be filtered and backwash water one after the other through a fitting (not shown) fixed on the chamber in a similar manner as described above.
1
Claims (15)
1. A solid-liquid filtering method in which liquid to be filtered is passed through a thick band of assembled filaments to filter off and capture solid by supplying liquid in the direction of filament retainment, said band comprising closely paralleled monofilaments of predetermined length, one end portion of which being fixed and the other end portion being floated so as to keep the said band in a plane situation at proper location by a support only when each filament is forced to turn. in a regular direction.
2. A solid-liquid filtering method claimed in Claim 1 wherein a band of assembled filaments is washed intermittently during a filtering process by supplying washing water in the backward direction against a flow of liquid to be filtered.
3. A solid-liquid filtering method claimed in Claim 1 wherein said monofilaments are 0.3 mm or less in diameter.
A solid-liquid filtering method claimed in Claim 1 wherein solid monofilaments are made of plastics.
5. A solid-liquid filtering method cl aimed in Claim 1 wherein the said monofilaments are made of carbon fiber.
6. A solid-liquid filtering method claimed in Claim 1 wherein the said monofilaments are metal monofilaments.
7. A solid-liquid filtering system which comprises a thick band of assembled filaments prepared by closely arranging paralleled monofilaments of predetermined length, a means for fixing one end portion of the said band and a network support for keeping the said band in a plane situation at proper location when the said band is forced to turn in a regular direction, one - 1 0 - end portion of the said monofilaments being fixed and the other end portion being floated.
8. A solid-liquid filtering system claimed in Claim 7 wherein the said monofilaments are 0,3 mm or less in diameter.
9. A solid-liquid filtering system claimed in Claim 7 wherein the said monofilaments are made of plastics.
10. A solid-liquid filtering system claimed in Claim 7 wherein the said monofilaments are made of carbon fiber.
11. A solid-liquid filtering system claimed in.Claim 7 wherein said monofilaments are metal monofilaments.
12. A filter assembly comprising filaments having a first end mounted on a support, the filaments being supported in an operative filtering position when a medium is passed therethrough in a filtering direction, the second end of each filament being substantially free to enable the filaments to move out of the filtering position to facilitate cleaning.
13. A filter assembly according to claim 12, wherein the filaments are supported in the filtering position by a grill.
14. A filter assembly comprising filaments mounted for free movement between a filtering position and a cleaning position, wherein the position of the filaments is determined by the direction of flow through the filter assembly.
15. A filter assembly according to claim 14, wherein flow in a first direction urges the filaments into the filtering position, and flow in an opposite urges the filaments out of the filtering position to the cleaning position.
1 1 -
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/524,387 US6508942B2 (en) | 1999-12-20 | 2000-03-13 | Solid-liquid filtering method and system for sewage, waste water and the like |
GB0006172A GB2360225B (en) | 2000-03-13 | 2000-03-14 | A filtering method and system for separating solids from a liquid |
DE10012534A DE10012534C2 (en) | 2000-03-13 | 2000-03-15 | Solid-liquid filter process and system for wastewater and the like |
CNB001043218A CN1177767C (en) | 2000-03-13 | 2000-03-17 | Solid-liquid filtering method and system for sewage and waste water, etc. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/524,387 US6508942B2 (en) | 1999-12-20 | 2000-03-13 | Solid-liquid filtering method and system for sewage, waste water and the like |
GB0006172A GB2360225B (en) | 2000-03-13 | 2000-03-14 | A filtering method and system for separating solids from a liquid |
DE10012534A DE10012534C2 (en) | 2000-03-13 | 2000-03-15 | Solid-liquid filter process and system for wastewater and the like |
CNB001043218A CN1177767C (en) | 2000-03-13 | 2000-03-17 | Solid-liquid filtering method and system for sewage and waste water, etc. |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0006172D0 GB0006172D0 (en) | 2000-05-03 |
GB2360225A true GB2360225A (en) | 2001-09-19 |
GB2360225B GB2360225B (en) | 2003-06-11 |
Family
ID=27429881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0006172A Expired - Fee Related GB2360225B (en) | 1999-12-20 | 2000-03-14 | A filtering method and system for separating solids from a liquid |
Country Status (3)
Country | Link |
---|---|
CN (1) | CN1177767C (en) |
DE (1) | DE10012534C2 (en) |
GB (1) | GB2360225B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10260496A1 (en) * | 2002-12-21 | 2004-07-15 | Mtu Aero Engines Gmbh | Filter for gas or liquid, in flow through pipe, has bristles secured at pipe section clamping points to project into medium flow to separate any particles |
EP2285467A4 (en) * | 2008-04-11 | 2011-11-23 | Ian Dracup Doig | An improved filtration barrier |
CN109432867A (en) * | 2018-11-21 | 2019-03-08 | 南通中国科学院海洋研究所海洋科学与技术研究发展中心 | A kind of Branchial filter |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3527351A (en) * | 1969-01-09 | 1970-09-08 | Purex Corp Ltd | Fluid filtering apparatus |
US4167482A (en) * | 1976-10-11 | 1979-09-11 | Mueller Hans | Filtering method and apparatus |
GB2023017A (en) * | 1978-04-27 | 1979-12-28 | Swinney Eng | Filter |
US4219420A (en) * | 1978-03-02 | 1980-08-26 | Chemap Ag | Arrangement for and a process of filtering a contaminated medium |
EP0280052A1 (en) * | 1987-01-27 | 1988-08-31 | Dongbei Power College | Method of and apparatus for filtering a medium |
US4783259A (en) * | 1986-07-07 | 1988-11-08 | Wade Charles E | Helical coil filter element |
WO1997048471A1 (en) * | 1996-06-18 | 1997-12-24 | Shurflo Pump Manufacturing Co. | Heavy duty strainer |
GB2319190A (en) * | 1996-11-09 | 1998-05-20 | Hozelock Ltd | Filament filter for water treatment |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1833315A (en) * | 1923-12-21 | 1931-11-24 | Harry H Burhans | Filtering medium |
EP0119340B1 (en) * | 1983-03-21 | 1988-08-17 | Filtration Water Filters for Agriculture and Industry Ltd. | A filter element for filtering fluids |
DE19624483A1 (en) * | 1996-06-19 | 1998-01-02 | Mecana Umwelttechnik Ag | Filter cloth, filtering method and filtering device for liquid filtration |
-
2000
- 2000-03-14 GB GB0006172A patent/GB2360225B/en not_active Expired - Fee Related
- 2000-03-15 DE DE10012534A patent/DE10012534C2/en not_active Expired - Fee Related
- 2000-03-17 CN CNB001043218A patent/CN1177767C/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3527351A (en) * | 1969-01-09 | 1970-09-08 | Purex Corp Ltd | Fluid filtering apparatus |
US4167482A (en) * | 1976-10-11 | 1979-09-11 | Mueller Hans | Filtering method and apparatus |
US4219420A (en) * | 1978-03-02 | 1980-08-26 | Chemap Ag | Arrangement for and a process of filtering a contaminated medium |
GB2023017A (en) * | 1978-04-27 | 1979-12-28 | Swinney Eng | Filter |
US4783259A (en) * | 1986-07-07 | 1988-11-08 | Wade Charles E | Helical coil filter element |
EP0280052A1 (en) * | 1987-01-27 | 1988-08-31 | Dongbei Power College | Method of and apparatus for filtering a medium |
WO1997048471A1 (en) * | 1996-06-18 | 1997-12-24 | Shurflo Pump Manufacturing Co. | Heavy duty strainer |
GB2319190A (en) * | 1996-11-09 | 1998-05-20 | Hozelock Ltd | Filament filter for water treatment |
Also Published As
Publication number | Publication date |
---|---|
DE10012534C2 (en) | 2003-07-03 |
GB2360225B (en) | 2003-06-11 |
DE10012534A1 (en) | 2001-09-27 |
CN1314311A (en) | 2001-09-26 |
CN1177767C (en) | 2004-12-01 |
GB0006172D0 (en) | 2000-05-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6685843B2 (en) | Internal spa filter | |
US6508942B2 (en) | Solid-liquid filtering method and system for sewage, waste water and the like | |
US20040206682A1 (en) | Filter assembly utilizing carbon block and pleated filter element | |
US6776295B2 (en) | Solid-liquid filtering method and system for sewage, waste water and the like | |
US20040149666A1 (en) | Filtering system for a pool or spa | |
JP2005523144A (en) | Enclosed filter cartridge | |
US3631987A (en) | Swimming pool water clarifier | |
GB2360225A (en) | Filament filter for liquids | |
JP2004321893A (en) | Filtration apparatus | |
JP3142792B2 (en) | Wastewater treatment method using carbon-based adsorbent | |
JP3112927B2 (en) | Water purifier | |
KR100378268B1 (en) | Solid-liquid filtering method and system for sewage, waste water and the like | |
JP3114487B2 (en) | Filtration equipment using an asymmetric filtration membrane. | |
KR100274759B1 (en) | Microfiltration method and system using textile hose | |
CN112892035A (en) | Automatic back-flushing prefilter | |
JP2505757Y2 (en) | Filtration filter | |
JP2803041B2 (en) | Filtration device | |
JPH11197414A (en) | Filter element and filter device | |
TW527204B (en) | Solid-liquid filtering method and apparatus for sewage, waste water and the like | |
JP3310855B2 (en) | Filtration equipment for sewage | |
JP2002239308A (en) | Filter apparatus using floating filter medium and water treatment method | |
KR200346468Y1 (en) | Diatomite filter system using wire rope | |
CN2356733Y (en) | Wall-type filtering bag filter | |
CN212403679U (en) | Filter equipment is used in making wine | |
CN214513057U (en) | Automatic back flush prefilter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20060314 |