GB2351677A - Edge filter with filament wound around cage - Google Patents

Edge filter with filament wound around cage Download PDF

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Publication number
GB2351677A
GB2351677A GB0018742A GB0018742A GB2351677A GB 2351677 A GB2351677 A GB 2351677A GB 0018742 A GB0018742 A GB 0018742A GB 0018742 A GB0018742 A GB 0018742A GB 2351677 A GB2351677 A GB 2351677A
Authority
GB
United Kingdom
Prior art keywords
filter medium
solid
liquid separating
separating filter
filaments
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
Application number
GB0018742A
Other versions
GB0018742D0 (en
GB2351677B (en
Inventor
Tadaki Morimura
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.)
MORIMURA KOUSAN KABUSHIKI KAIS
Original Assignee
MORIMURA KOUSAN KABUSHIKI KAIS
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
Priority claimed from JP29436096A external-priority patent/JP3686918B2/en
Application filed by MORIMURA KOUSAN KABUSHIKI KAIS filed Critical MORIMURA KOUSAN KABUSHIKI KAIS
Publication of GB0018742D0 publication Critical patent/GB0018742D0/en
Publication of GB2351677A publication Critical patent/GB2351677A/en
Application granted granted Critical
Publication of GB2351677B publication Critical patent/GB2351677B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/445—Bar screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
    • B01D29/48—Edge filtering elements, i.e. using contiguous impervious surfaces of spirally or helically wound bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
    • B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/668—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with valves, e.g. rotating valves for coaxially placed filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/188—Multiple filtering elements having filtering areas of different size
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/46—Several filtrate discharge conduits each connected to one filter element or group of filter elements

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)

Abstract

An edge filter comprises an inner open framework cage 27 and an outer wall 28 formed by winding a filament 1 round the circumference of the cage. The cage comprises spaced supports 30 joined together by a number of spaced frames 27. The frames may be circular, oval (ns) or rectangular (Fig 14). The frames and supports are made of plastics or metal, and bonded together where they cross. The filament is polypropylene of 0.1 mm diameter and is closely wound with slight spaces between successive turns to define filtering gaps. Three filters with different diameter cages may be arranged concentrically (Fig 12) to filter sewage. The material and thickness of the filaments of each filter may be different, or if the filaments have the same diameter the number of turns are different.

Description

2351677
SPECIFICATION
SOLID-LIQUID SEPARATING FILTER MEDIUM FOR SEWAGE, WASTE WATER, ETC.
BACKGROUND OF THE INVENTION Field of the Invention
The present invention relates to a solid-liquid separating filter medium for sewage, waste water, etc. More particularly, the present invention relates to a solid-liquid separating filter medium of sufficient filtering ability for sewage, waste water, etc. which can be prepared easily and is repeatedly,..usable by back wash in g wi thou t diff icu I ty when the fi I ter medium has become clogged, for C example, due to long term service. Of course, the invention may be suitable for any solid-liquid separation application. Prior Art
Floating sludge in sewage and waste water has been conventionally removed by filtration, centrifugal separation, pressurized floatation, solidification by the use of a coagulant, and the like.
In the case of filtrationi a filtration film is generally used. It is necessary, however, to laminate a number of filtration films instead of usinga single film' iso as to increase the filtration effect, and the preparation of such laminated films is rather troublesome. Other filter media other than the films used for filtering sewage, waste water, etc. include various kinds of materials such as cloth, sand, ceramics, porous medium and the li-ke. These media tend to cause clogging during long-term service, which are hardly reusable by back washing.
SUMMARY OF THE INVENTION
Aspects of the invention are defined in the claims.
In one particular aspect, the present invention provides a solid- liquid separating filter medium for sewage, waste water, etc. comprising a filter screen in which a number of filaments are closely aligned in parallel in the same direction and crosswise bonded to hoops at predetermined points thereof to form integral blind-like structure.
In another aspect, the present invention provides a solid-liquid separating filter medium for sewage, waste water, etc. comprising an inner cage formed by bonding a plurality of lateral frame crosspieces arranged at certain spaces and vertical supports arranged at plural points on the circumference of the lateral frame crosspieces to cross at right angles on a surface thereof at intersecting points of the lateral frame crosspieces and the vertical supports and an outer wall formed by winding up a filament closely in the circumferential direction but at a certain space on _an outer surface of the cage.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a view of filter screen constructing a filter medium of the present invention.
Fig. 2 is a view of an embodiment of a filter screen different from one shown in Fig. 1.
Fig. 3 is an illustration of a filter medium of the present invention.
Fig. 4 shows an application of a filter medium shown in Fig.
3.
- Fig. 5 is a view of another type of filter medium different from one shown in Fig. 3.
Fig. 6 is a view of another filter screen different from one shown in Fig. I.
Fig. 7 is a view of still another filter screen.
Fig. 8 is a cross sectional view of a filter system using a filter medium.
Fig. 9 is a section on line IX-IX in Fig. 8.
Fig. 10 is a view of another embodiment of a filter medium.
Fig. 11 is an illustration of an inner cage for a filter medium.
Fig. 12 is a transverse sectional view of a filter medium of multi-layer structure.
Fig. 13 is a partly sectional schematic illustration of a filter system practically used filter media shown in Fig. 12.
Fig. 14 is a view of yet another embodiment of a filter medium.
DETAILED DESCRIPTION AND PREFERRED EMBODIMENTS OF THE INVENTION
A ribbon may be used to form a filter medium instead of a hoop. The ribbon may be made of plastics, metal, etc..and is not restricted to a specific material.
A laminate of plural filter screens maybe effectively used for solidliquid separation and may be applied in a plane form or a cylindrical form.
When the filter screens are laminated flatwise, the filaments of one screen may be parallel, or non-parallel, with the filaments of an adjacent screen.
Thethickness of each parallel filament of the filter screen may btr increased or reduced in order from one side to the other. A unit of filaments of the same thickness may also be aligned in parallel to yield certain width thereof, followed by another unit of filaments in series while increasing or reducing their thickness in order as a unit.
Further, the filter screen may be-rolled up to form a whirled cylindrical solid-liquid separating filter medium.
On the other hand, circular, oval or square frame crosspi eces can provide a hol 1 ow sol i d-I i quid separati ng f i 1 ter medi um of the present invention in a cylinder, elliptic cylinder or square pole shape, respectively. A plurality of cylindrical solid-liquid separating filter media having different diameters may be arranged concentrically at certain spa ces from each other to forin a cylindrical multi-layer structure, and/or a series of.similarly shaped filter media may be arranged in parallel.
Suitable materials used for forming the filter screen or the hollow filter medium include plastics, metal fiber, carbon fiber, ceramics, glass fiber and the like, if such a material has desirable resistance.
Thethicknessor cross-sectional shape of filaments to be aligned in parallel as the filter screen or the hollow filter medium is not especially restricted. ff i The thi ckness or cross sectional shape is not necessarily the same when a plurality of the filter screens or the hollow filter media is multi-layered or arranged in parallel. These filaments may be crisped.
Preferably, filaments of about 0.03 mm to 0.5 mm in diameter areused, although a more thick or thinner diameter can be applied.
However, excessively thin filaments tend to reduce strength of thefilter screen and would exhibit an insufficient filtering function. On the other hand, excessively thick filaments also provide a filtering function enough to be required. The filaments way be rough or smooth on the surface.
A method of bonding or fixing filaments of the filter screen and the lateral crosspieces is not especially restricted. Any suitable fixing may be used.
As is described above, it is-quite easy to reuse the solidliquid separating filter medium for sewage, waste water, etc. of the present invention by back-flowing the filtered liquid so that sl udge f 1 oated there i n can be removed. This can prevent terminal clogging of the filter medium without difficulty. Accordingly, there are provided more stable filtering properties and lower frequency in exchanging of the filter medium, i.e., easier maintenance thereof compared with conventional media,thereby increasing filtering efficiency.
An appropriate combination of shape, material and thickness of the filaments, as well as the numbers and directions of lamination of the filter screens can conveniently provide filtering properties depending on a kind of sewage or waste water to be filtered and the desired degree of filtering A filter medium of multi-layered structure may be easily prepared by simply rolling up a blind-like filter screen to form a whirled cylinder.
As the filtering filaments are regularly aligned in parallel at certain spaces, the filter medium can be easily reused by backflowing the filtered liquid to remove sludge when clogging has occurred.
A filter screen prepared by arranging units of filaments hav ing different thickness may be rolled up to form a whirled cylindrical filter medium. i.e., multi-layered structure in which thickness of the layer changes in the inner or outer direction on the cross-sectional surface of a circumferential wall portion thereof. - This is one of the most appropriate structures for a filter medium A filter medium of an inner cage type is easily prepared by a simple process in which a filament iswound around the outer circumferential portion of the cage to form a hollow body. It is convenient that void spaces on the circumferential wall can be easily controlled by changing number of turns of the filament. It is also convenient to repair a partial breakage of the filter medium without difficulty by rewinding up the filament. Because of a constant direction of winding and void spaces, the' filter medium is reusable by back-washing the filtered liquid to remove sludge, thereby keeping the filtering properties in a preferred condition or range of conditions.
Referring now to the drawings, the present invention will be further described in the following.
Fig. 1 is a view of a filter screen 3 constructing a filter medium of the present invention. The filter screen 3 is prepared by banding a number of propylene filaments 1 which are closely aligned in parallel in the vertical direction to thermoplastic lateral frame crosspieces 2 which are arranged in the lateral direction at plural points in the vertical direction of the filaments 1 and integrally bonding the lateral frame crosspieces 2 to the filaments 1 to form blind-like structure as a whole. The width of the filter screen i s about 1 m, the space between the lateral f rame crosspieces is about 20 cm the thickness of the filaments 1 and the crosspieces I- 2- i-s about 0. 2 mm i n di ameter. The lateral and verticaL dimensions of the filter screen may be variable depending on size of a filter 6 system. The space between the lateral frame crosspieces 2 may be decided to stably sustain a shape of the filter screen and preferably, is in the range of about 3cm to about 30cm in general.
As shown in Fig. 2, plastic ribbons 13 way be used instead of the lateral frame crosspieces 2. When such ribbons are used, the filter screen becomes wore flexible, which is convenient to form a cylindrical type.
The filter medium of the present invention is prepared by laminating a plurality of these filter screens 3. Fig. 4 is an illustration of a filter medium 4 prepared by laminating three filter screens 3 flatwise so that the filaments 1 meet at right angles between each of the filter screens 3.
The filter medium 4 shown in Fig. 3 is used, for example, in a manner as shown in Fig. 4. The filter medium 4 is fitted on a body 5 of a filter system 10 to be used in a sewage purifier, etc. The body 5 is provided with a permeating space 6 for the filtered liquid, while the filter medium 4 is fixed on an opening of the body 5 by means of a support 7. A pipe 8 communicating to the permeating space 6 is connected to the body 5.
Referring to Fig. 4, a filtering process using the filter medium of the present invention will be described in the following.
Untreated liquid 11 of sewage or waste water is filtered while passing through the filter medium 4 and being introduced to the permeating space 6 of the body 5. Sludge 12 floating in the untreated liquid 11 of sewage or waste water is separated by means of the filter medium 4. After long- term filtration, sludge 12 is arcumulated an the surface of the filter medium 4 to cause clogging. Once such clogging has occurred, then the amount of the filtered liquid 9 flowing into the permeating space 6 decreases As the filtered liquid 9 in the permeating space 6 is quantitatively drained through the pipe 8, the water level of the filtered liquid 9 lowers as the flow of the filtered liquid is decreased. When the water level of the filtered liquid 9 decreases to a predetermined level, a sensor (not shown) detects such a decrease in the water level, and actuates a valve (not shown) mounted on the pipe 8 to flow back the filtered liquid 9 through the filter medium 4. The sludge 12 accumulated on the surface of the filter medium 4 is thus removed to dissolve clogging.
Fig. 5 shows a filter medium prepared by laurinating three filter screens 3 to form a cylinder. These three filter screens 3 are laminated relative to each other closely without leaving space.
Fig. 6 shows filter screen structure different from the filter screen shown in Fig. 1. The filter screen 3 in this embodiment is provided with filaments 1 in parallel which thickness is increased in order from left to right hands of the figure. The thinnest filament is about 0.01 om in diameter, while the most thick filament is about 0.5 mm in diameter.
Fig. 7 shows another filter screen of the present invention.
The filter screen 3 of this embodiment comprises three units a, b and c of filaments 1 in which the filament thickness is the same 4within a unit and increases in order of the units a, b and c. The thickness of filaments 1 of the units a, b and c is about 0.05nim, 0.25 mo and 0.5 mm in diameter, respectively.
- An embodiment using this filter screen is shown in Figs. 8 and 9. Fig. 8 is a central cross sectional view of a filtering system provided with a filter medium as a whole, while Fig. 9 is a section on line IX-IX in Fig. 8. In the filtering system, the filter screen 3 is rolled up a few times around a cylindrical wire net core 14 to form a cylinder, which is then fastened by means of a fixing ring 15 to form a cartridge type cylindrical filter medium 4. That is, the cylindrical filter medium 4 is provided with a circumferential wall portion 16 comprising a multi-layered structure of the filter screen 3. In the cylindrical filter medium 4, the filter screen 3 is rolled up so that the more thick filaments are arranged outside and the thinner ones inside. The core 14 may be of any cylindrical structure made of, for example, a plastic net other than the wire net.
The cylindrical filter medium 4 is detachably fitted with both ends thereof inside of a casing 19 by means of fitting adapters 17 and 18. More precisely, the fitting adaptors 17 and 18 are screwed to openings 20 and 21 formed on side walls of both sides of the casing 19. The casing 19 is provided with inlets 23 and 24 for untreated liquid 22 of sewage or waste water. The untreated liquid 22 supplied to the case 19 is passed through the a circumferential wall portion 16 of the cylindrical filter medium 4 into inside thereof. The untreated liquid 22 is filtered when it passes through the circumferential wall portion 16 and the thus filtered liquid 25 flows the inside portion 26 of the cylindrical filter medium 4 and drains out of one or both ends of the casing 19.
According to this embodiment, the cylindrical filter medium 4 is prepared by rolling up the filter screen 3 so that the unit c of-the thick filaments is arranged outside and the unit a of the thinnest filaments inside, however, it is possible to arrange the thick filaments inside and the thinnest outside. In the latter case, the untreated liquid 22 is allowed to inversely flow from inside to outside of the cylindrical filter medium 4.
Fig. 10 shows a filter medium 4 of another embodiment and Fig. 11 shows an inner cage 27 used for forming the filter medium 4 shown in Fig. 10. The inner cage 27 consists of lateral frame crosspieces 29 and vertical supports 30. More precisely, a plurality of lateral frame crosspieces 29 are arranged at certain spaces, while the vertical supports 29 are arranged at plural points in the circumferential direction of the lateral frame crosspieces 29 to cross at right angles on a surface thereof, intersecting portions of the lateral frame crosspieces 29 and the vertical supports 30 being integrally bonded. Although both of the lateral frame crosspieces 29 and the vertical supports 30 are made of plastics in this embodiment, they may be made.of metal if such a metal has rigidity to certain extent and the required resistance.
The hollow filter medium 4 shown in Fig. 10 is prepared by winding a polypropylene filament 1 of 0.1 mm in diameter on the outer circumferential portion of the inner cage 27 in the circumferential direction at slight spaces between neighboring filaments to form a circumferential wall 28 appropriately provided with voids thereof.
Fig. 12 is a transverse sectional view of three hollow filter media 31, 32 and 33 having different diameters which are arranged relative to each other trimly and concentrically at certain spaces. Fig. 13 is a partially sectional illustration of a filtering system in-w-hich the filter media shown in Fig. 12 are practically applied.
1 0 The material and thickness of filaments used in these three hollow filter media 31, 32 and 33 may either be same or different. Further, when the filaments have the same diameter, the number of turns thereof may be different.
In this filtering system, the trimly arranged hollow filter media 31, 32 and 33 are installed inside of a sewage tank 37 in such situation where the upper and bottom openings thereof are capped by means of an upper lid 34 and a bottom lid 35, while a net-like protective cover 36 is fitted around the filter medium 33. A suction pipe 42, which one end is put in a treated water tank 41, is provided with a pump 42 and valves 39 and 40 and connected with three branch pipes 43, 44 and 45 which penetrate theupper lid 34 and are put inside of the innermost hollow filter media 31, between the innermost and the intermediate hollow filter media 31 and 32 and between the intermediate and the outermost hollow filter media 32 and 33, respectively. On the other hand, a drain pipe 48 is provided with valves 46 and 47 and connected with two branch pipes which penetrate the bottom lid 35 and put between the innermost and the intermediate hollow filter media 31 and 32 and between the intermediate and the outermost hollow filter media 32 and 33, respectively.
Filtering process in this filtering system is as in the following. Untreated sewage liquid 51 in the sewage tank 37 passesthrough the outermost, the intermediate and then the innermost hollow filter media 33, 32 and 31 one after the other to provide filtration in three stages, respectively, and pumped up by me-ans of the suction pump 42 to the treated water tank 41. The liquid filtered only through the outermost and the intermediate - 1 1 - hallow filter medium 33 and 32 can be obtained when the valve 39 is opened, while the liquid treated only through the outermost hollow filter medium 33 is obtainable, and accordingly, these valves 39 and 40 are switched depending on the purpose.
When these hollow filter media 31, 32 and 33 are clogged, the filtered liquid 52 in the treated water tank 41 is pumped up by reversing the pump 38 of the suction pipe 42 to cause back-flow in the suction pipe 42. The filtered liquid 52 is then erupted out of the branch pipes 43,' 44 and 45, the hollow filter media 31, 32 and 33 being washed from inside thereof to easily remove a problem of clogging. The thus back-floWedliquid can be removed by means of the drain pipe 48. The back-flow can be conducted timely by automatic control. As has been described above, clogging can be dissolved without difficulty.
Fig. 14 shows a hollow filter medium 53 of yet another embodiment of the present invention. According to this embodiment, the lateral frame crosspieces are rectangle which forms a filter medium in a square prism shape. The basic structure is the same as the above mentioned cylindrical one.
A plurality of the hollow filter media 53 of this embodiment can be arranged in parallel, and used for sewage or waste water filtration, in a similar manner as in the case of cylindrical hollow filter media.
The above embodiments are merely illustrative of preferred examples of the invention. The skilled man will appreciate that many variations and modifications may be made within the scope of the invention.
t 2 - 13

Claims (16)

1. A solid-liquid separating filter medium for sewage, waste water, etc. comprising an inner cage formed by bonding a plurality of lateral frame crosspieces arranged at certain spaces and vertical supports arranged at plural points on the circumference of the lateral frame crosspieces to cross at right angles on a surface thereof at intersecting points of the lateral frame crosspieces and the vertical supports and an outer wall formed by winding up a filament closely in the circumferential direction but at a certain space on an outer surface of the cage.
2. A solid-liquid separating filter medium claimed in Claim 1 wherein the lateral frame crosspieces are circular.
3. A solid-liquid separating filter medium claimed in Claim 1 wherein the lateral frame crosspieces are oval.
4. A solid-liquid separating filter medium claimed in Claim 1 wherein the lateral frame crosspieces are square.
5. A solid-liquid separating filter medium for sewage, waste water, etc. claimed in Claim 2 wherein a plurality of the filter media of different thickness are concentrically arranged.
6. A solid-liquid separating filter medium for sewage, waste water, etc.
comprising a filter screen in which a number of filaments are closely aligned in parallel in the same direction and crosswise bonded to hoops at predetermined points thereof to form integral blind-like structure.
7. A solid-liquid separating filter medium claimed in Claim 6 wherein ribbons are used instead of another hoops.
14
8. A solid-liquid separating filter medium claimed in Claim 6 wherein a plurality of solid-liquid separating filter media are laminated.
9. A solid-liquid separating filter medium claimed in Claim 8 wherein the filter 5 screen is laminated flatwise.
10. A solid-liquid separating filter medium claimed in Claim 9 wherein the filter screen is laminated so that filaments are directed in the same direction.
11. A solid-liquid separating filter medium claimed in Claim 9 wherein the filter screen is laminated so that filaments are directed in the different direction.
12. A solid-liquid separating filter medium claimed in Claim 8 wherein the filter screen is laminated cylindrically.
13. A solid-liquid separating filter medium claimed in Claim 6 wherein the filter screen is formed by aligning the filaments in parallel of different thickness in a gradually thickened or thinned order.
14. A solid-liquid separating filter medium claimed in Claim 6 wherein the filter screen is formed by aligning the filaments of the same thickness to result in a unit thereof in certain width and arranging plural units thereof in a gradually thickened or thinned order.
15. A solid-liquid separating filter medium claimed in Claim 13 wherein the filter screen is rolled up to form a whirled cylinder shape.
16. A solid-liquid separating filter medium claimed in Claim 14 wherein the filter screen is rolled up to form a whirled cylinder shape.
GB0018742A 1996-10-16 1997-10-16 Solid-liquid separating filter media for sewage, waste water, etc Expired - Fee Related GB2351677B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP29436096A JP3686918B2 (en) 1996-10-16 1996-10-16 Filtration device for solid-liquid separation of sewage, wastewater, etc.
GB9721934A GB2318991B (en) 1996-10-16 1997-10-16 Solid-liquid separating filter medium for sewage,waste water,etc

Publications (3)

Publication Number Publication Date
GB0018742D0 GB0018742D0 (en) 2000-09-20
GB2351677A true GB2351677A (en) 2001-01-10
GB2351677B GB2351677B (en) 2001-03-21

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GB0018742A Expired - Fee Related GB2351677B (en) 1996-10-16 1997-10-16 Solid-liquid separating filter media for sewage, waste water, etc

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB982549A (en) * 1961-04-10 1965-02-03 American Mach & Foundry Filter
US4456531A (en) * 1980-08-11 1984-06-26 Totoku Electric Co., Ltd. Filter and a manufacturing method therefor
EP0228262A2 (en) * 1985-12-27 1987-07-08 Nagaoka Kanaami Kabushiki Kaisha Double cylinder screen
JPH07313814A (en) * 1994-05-27 1995-12-05 Rikiyuu:Kk Filament filter device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB982549A (en) * 1961-04-10 1965-02-03 American Mach & Foundry Filter
US4456531A (en) * 1980-08-11 1984-06-26 Totoku Electric Co., Ltd. Filter and a manufacturing method therefor
EP0228262A2 (en) * 1985-12-27 1987-07-08 Nagaoka Kanaami Kabushiki Kaisha Double cylinder screen
JPH07313814A (en) * 1994-05-27 1995-12-05 Rikiyuu:Kk Filament filter device

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GB2351677B (en) 2001-03-21

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