WO2010056128A1 - A filter - Google Patents

A filter Download PDF

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Publication number
WO2010056128A1
WO2010056128A1 PCT/NZ2009/000242 NZ2009000242W WO2010056128A1 WO 2010056128 A1 WO2010056128 A1 WO 2010056128A1 NZ 2009000242 W NZ2009000242 W NZ 2009000242W WO 2010056128 A1 WO2010056128 A1 WO 2010056128A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
plate
biological filter
base
biological
Prior art date
Application number
PCT/NZ2009/000242
Other languages
French (fr)
Inventor
Paul Hill
Original Assignee
Bioceptor International Limited
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 Bioceptor International Limited filed Critical Bioceptor International Limited
Publication of WO2010056128A1 publication Critical patent/WO2010056128A1/en

Links

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
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
    • B01D35/0276—Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs
    • 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
    • B01D29/31—Self-supporting filtering elements
    • B01D29/33—Self-supporting filtering 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
    • B01D29/11—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
    • B01D29/31—Self-supporting filtering elements
    • B01D29/33—Self-supporting filtering elements arranged for inward flow filtration
    • B01D29/333—Self-supporting filtering elements arranged for inward flow filtration with corrugated, folded 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
    • B01D29/50—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
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2866—Particular arrangements for anaerobic reactors
    • C02F3/288—Particular arrangements for anaerobic reactors comprising septic tanks combined with a filter

Definitions

  • the invention relates to a filter and more particularly to a biological cartridge filter for use with a sewage system or the like.
  • small scale sewage systems include a septic tank, which is the key component of a sewage septic system.
  • Other components typically mandated and/or restricted by local governments, optionally include pumps, alarms, sand filters, and clarified liquid effluent disposal means such as a septic drain field, ponds, or the like.
  • An anaerobic bacterial environment develops in a septic tank and this decomposes or mineralizes the waste discharged into the tank.
  • Septic tanks are coupled with other on-site wastewater treatment units such as biofilters or aerobic systems.
  • the biofilters are commonly situated in or adjacent an outlet from the septic tank immediately before the drain pipes through which the remaining liquid effluent is passed to the land application system.
  • Biofilters currently used are typically manufactured from plastics materials and are created to filter solid biological material from the waste water before it is allowed to pass to the land application system.
  • the plastic biofilters are generally cylindrical in shape and are the subject of periodic cleaning to remove biological material which builds up in and around slots or holes which filter material passing through the filter. It is in this cleaning process that the plastic material can be damaged requiring replacement of the biofilter.
  • An object of the invention is to overcome the above identified problems and to provide a biological cartridge filter for use in a sewage system which at least offers consumers a useful alternative choice.
  • a biological filter for a sewage system including a columnar filter body perforated with a plurality of holes, the columnar filter body being star shaped in plan to thereby increase the filtering capacity by increasing the filter's surface area.
  • the biological filter is preferably manufactured from stainless steel, such as 316 stainless steel.
  • the columnar filter body is generally mounted with its longitudinal axis vertical and can be perforated with holes of about 3mm in diameter to provide a 50% open area in the filter body.
  • the perforations are incorporated for the full height of the filter body.
  • the filter body is mounted in association with an outlet chamber and a lifting handle to aid handling of the biological filter.
  • the outlet chamber can be formed as a cylindrical column which can also be perforated by holes along its full length.
  • a biological filter for a sewage system including an assembly formed from a star shaped in section columnar filter body perforated with a plurality of holes, a cylindrical outlet chamber perforated with a plurality of holes, a handle, a cap plate, an interchange plate, a base plate and connecting means, the arrangement being such that the handle includes a rod on which in vertical order the cap plate, outlet chamber, interchange plate, columnar filter body and base plate are fitted before being locked together by the connecting means to form a biological filter assembly in which the star shaped in plan columnar filter body increases the filtering capacity.
  • the cap plate can be formed with a recess that fits inside an upper end of the cylindrical outlet chamber.
  • the interchange plate can be annular in plan with returns on its inner and outer edges, the returns being dimensioned so that it fits inside a lower end of the cylindrical outlet chamber and at the same time covers the upper end of the columnar filter body.
  • the base plate is adapted to cover the lower end of the columnar filter body and in association with the connecting means holds the assembly together.
  • the base plate can be formed in two parts from a base fixing plate and a base star plate.
  • the base fixing plate can include a fixing ring and transverse member which are preferably fitted during manufacture to the base of the columnar filter.
  • the fixing ring and transverse member are adapted to locate the base star plate over the lower end of the columnar filter body.
  • the base star plate can be perforated with holes of about 3mm diameter and can be held in position to the base fixing plate by connecting means.
  • the base star plate can be provided with a thumb screw or other connecting means to allow the star base plate to be removed for cleaning or , maintenance.
  • Figure 1 is a side view of an example of biological cartridge filter according to the invention
  • Figure 2 is a perspective view from above of the biological cartridge filter shown in Figure 1 ;
  • Figure 3 is a perspective view from below of the biological cartridge filter shown in Figures 1 and 2;
  • Figure 4 is a plan view of a cap plate for the biological filter shown in
  • Figure 5 is a perspective view of the cap plate shown in Figure 4;
  • Figure 6 is a side view of the cap plate shown in Figures 4 and 5;
  • Figure 7 is a plan view of an interchange plate for the biological filter shown in Figures 1 to 3;
  • Figure 8 is a perspective view of the interchange plate shown in Figure
  • Figure 9 is a side view of the interchange plate shown in Figures 7 and
  • Figure 10 is a plan view of a columnar filter body for the biological filter shown in Figures 1 to 3;
  • Figure 11 is a perspective view of the columnar filter body shown in Figure 10 for the biological filter shown in Figures 1 to 3;
  • Figure 12 is a side view of the columnar filter body shown in Figures
  • Figure 13 (a) is a plan view of a star base plate fixing assembly for the biological filter shown in Figures 1 to 3;
  • Figure 13 (b) is a cross section of the base plate fixing assembly shown in Figure 13(a);
  • Figure 14 is a plan view of a star base plate for the biological filter shown in Figures 1 to 3 and for use in the star base plate fixing assembly shown in Figures 13 (a) and (b);
  • Figure 15 is a side view of the base star plate shown in Figure 14;
  • Figure 16 is a perspective view of the star base plate fixing assembly shown in Figures 13 (a) and (b) and Figure 15;
  • Figure 17 is a side view of a star base plate fixing cap screw used for assembling the biological filter shown in Figures 1 to 3;
  • Figure 18 is a plan view of an outlet cylinder screen for the biological filter shown in Figures 1 to 3;
  • Figure 19 is a side view of the outlet cylinder screen shown in Figure 18;
  • Figure 20 is a perspective view of the outlet cylinder screen shown in
  • Figure 21 is a side view of a filter handle on which the biological filter shown in Figures 1 to 3 is assembled.
  • Figure, 22 is a perspective view the filter handle shown in Figure 21.
  • the biological cartridge filter is generally indicated by arrow 1 in Figures 1 to 3.
  • the filter in the example is an assembly formed from a star shaped in section columnar filter body 2 perforated with a plurality of holes which are shown in detail in Figures 11 and 12.
  • the assembly includes a cylindrical outlet screen chamber 3 (shown in detail in Figures 18 to 20) which is perforated with a plurality of holes, a filter handle 4 (shown in detail in Figures 21 and 22), a cap plate 5 (shown in detail in Figures 4 to 6), an interchange plate 6 (shown in detail in Figures 7 to 9), a star base plate 7 (shown in Figure 14 and 15), a base plate fixing assembly 8 (shown in detail in Figures 13 (a) and (b), 16 and 17) and connecting means 9 (shown only in Figure 1 and Figure 17).
  • the cap plate 5 (detailed in Figures 4 to 6) is formed with a recess 10 that is dimensioned and shaped to fit inside an upper end 11 of the cylindrical outlet screen chamber 3.
  • the cylindrical outlet screen chamber 3 can have larger holes, for example holes which are elliptical in shape which are about 10mm high and 5mm wide, than the holes in the columnar filter body 2 so that an increased flow of clarified and screened effluent can pass from the biological filter.
  • the inward flow of sewage into the filter body 2 occurs in the direction of arrow A in Figure 3 and is via the plurality of perforations in the screen body 2.
  • the interchange plate 6 ( Figures 7 to 9) can be annular in plan with returns 12 and 13 on its inner and outer edges respectively.
  • the return 12 is dimensioned so that it fits outside a lower end 14 of the cylindrical outlet chamber 3.
  • the return 13 is dimensioned so that the face 15 of the plate 6 covers an upper end 16 of the columnar filter body 2.
  • the base plate fixing assembly 8 and associated star base plate 7 are adapted to cover a lower end 17 of the columnar filter body 2 and in association with the connecting means 9 ( Figures 1 and 17) holds the biological filter base assembly together.
  • the base plate fixing assembly 8 can be formed in a number of parts including a fixing ring 18 ( Figures 13(a), 13(b), 15 and 16) and a transverse member 19 ( Figures 13 and 16).
  • the base star plate 7 ( Figure 14 and 15) sits on the transverse member 19 and is held against the lower end 17 of the filter body 2.
  • the base star plate 7 can be perforated with holes of about 3mm diameter and in use the fixing ring 18 locates the star plate 7 over the lower end 17 of the columnar filter body 2 before it is fixed in position by the . connecting . means 9.
  • the base fixing plate assembly 8 locates the assembled biological filter together on a rod section 20 of the handle 4 with the base star plate 7 being fixed to the transverse member 19 by the connecting means 9.
  • the rod section 20 has a transverse bar 21 ( Figures 21 and 22) which guides the handle in a vertical direction to assist with positioning it into position in the columnar filter.
  • Waste water applications dictate the use of 316 stainless steel, however economics and application can require and allow a variety of materials such as; 304 stainless steel, brass, aluminium etc. to be used as required.
  • the arrangement is such that in use the handle 4 allows the filter cartridge to be removed and cleaned and if need be disassembled for maintenance or cleaning in which the star shaped in plan columnar filter 2 body increases the filtering capacity.

Abstract

A biological filter for a sewage system which includes a columnar filter body (2) perforated with a plurality of holes. The filtering capacity is increased by the columnar filter body being star shaped in plan to thereby increase the surface area of the filter.

Description

A Filter
Technical Field
The invention relates to a filter and more particularly to a biological cartridge filter for use with a sewage system or the like.
Background Art
At present, particularly in New Zealand, small scale sewage systems include a septic tank, which is the key component of a sewage septic system. Other components, typically mandated and/or restricted by local governments, optionally include pumps, alarms, sand filters, and clarified liquid effluent disposal means such as a septic drain field, ponds, or the like.
An anaerobic bacterial environment develops in a septic tank and this decomposes or mineralizes the waste discharged into the tank. Septic tanks are coupled with other on-site wastewater treatment units such as biofilters or aerobic systems.
The biofilters are commonly situated in or adjacent an outlet from the septic tank immediately before the drain pipes through which the remaining liquid effluent is passed to the land application system.
Biofilters currently used are typically manufactured from plastics materials and are created to filter solid biological material from the waste water before it is allowed to pass to the land application system. The plastic biofilters are generally cylindrical in shape and are the subject of periodic cleaning to remove biological material which builds up in and around slots or holes which filter material passing through the filter. It is in this cleaning process that the plastic material can be damaged requiring replacement of the biofilter. An object of the invention is to overcome the above identified problems and to provide a biological cartridge filter for use in a sewage system which at least offers consumers a useful alternative choice.
Further objects and advantages of the invention will become apparent from the following description which is given by way of example only.
Summary of the Invention
According to a first aspect of the invention there is provided a biological filter for a sewage system, the filter including a columnar filter body perforated with a plurality of holes, the columnar filter body being star shaped in plan to thereby increase the filtering capacity by increasing the filter's surface area.
The biological filter is preferably manufactured from stainless steel, such as 316 stainless steel.
The columnar filter body is generally mounted with its longitudinal axis vertical and can be perforated with holes of about 3mm in diameter to provide a 50% open area in the filter body. Advantageously the perforations are incorporated for the full height of the filter body.
The filter body is mounted in association with an outlet chamber and a lifting handle to aid handling of the biological filter. The outlet chamber can be formed as a cylindrical column which can also be perforated by holes along its full length.
According to a second aspect of the invention there is provided a biological filter for a sewage system, the filter including an assembly formed from a star shaped in section columnar filter body perforated with a plurality of holes, a cylindrical outlet chamber perforated with a plurality of holes, a handle, a cap plate, an interchange plate, a base plate and connecting means, the arrangement being such that the handle includes a rod on which in vertical order the cap plate, outlet chamber, interchange plate, columnar filter body and base plate are fitted before being locked together by the connecting means to form a biological filter assembly in which the star shaped in plan columnar filter body increases the filtering capacity.
The cap plate can be formed with a recess that fits inside an upper end of the cylindrical outlet chamber.
The interchange plate can be annular in plan with returns on its inner and outer edges, the returns being dimensioned so that it fits inside a lower end of the cylindrical outlet chamber and at the same time covers the upper end of the columnar filter body.
The base plate is adapted to cover the lower end of the columnar filter body and in association with the connecting means holds the assembly together. The base plate can be formed in two parts from a base fixing plate and a base star plate. The base fixing plate can include a fixing ring and transverse member which are preferably fitted during manufacture to the base of the columnar filter. The fixing ring and transverse member are adapted to locate the base star plate over the lower end of the columnar filter body. The base star plate can be perforated with holes of about 3mm diameter and can be held in position to the base fixing plate by connecting means.
The base star plate can be provided with a thumb screw or other connecting means to allow the star base plate to be removed for cleaning or , maintenance.
Further aspects of the invention which should be considered in all its novel aspects will become apparent from the following description which is given by way of example only.
Description of the Drawings
An example of the invention will now be described with reference to the accompanying drawings in which: Figure 1 is a side view of an example of biological cartridge filter according to the invention;
Figure 2 is a perspective view from above of the biological cartridge filter shown in Figure 1 ; Figure 3 is a perspective view from below of the biological cartridge filter shown in Figures 1 and 2;
Figure 4 is a plan view of a cap plate for the biological filter shown in
Figures 1 to 3;
Figure 5 is a perspective view of the cap plate shown in Figure 4; Figure 6 is a side view of the cap plate shown in Figures 4 and 5;
Figure 7 is a plan view of an interchange plate for the biological filter shown in Figures 1 to 3;
Figure 8 is a perspective view of the interchange plate shown in Figure
7; Figure 9 is a side view of the interchange plate shown in Figures 7 and
8;
Figure 10 is a plan view of a columnar filter body for the biological filter shown in Figures 1 to 3;
Figure 11 is a perspective view of the columnar filter body shown in Figure 10 for the biological filter shown in Figures 1 to 3;
Figure 12 is a side view of the columnar filter body shown in Figures
10 and 11 ;
Figure 13 (a) is a plan view of a star base plate fixing assembly for the biological filter shown in Figures 1 to 3; Figure 13 (b) is a cross section of the base plate fixing assembly shown in Figure 13(a);
Figure 14 is a plan view of a star base plate for the biological filter shown in Figures 1 to 3 and for use in the star base plate fixing assembly shown in Figures 13 (a) and (b); Figure 15 is a side view of the base star plate shown in Figure 14;
Figure 16 is a perspective view of the star base plate fixing assembly shown in Figures 13 (a) and (b) and Figure 15;
Figure 17 is a side view of a star base plate fixing cap screw used for assembling the biological filter shown in Figures 1 to 3; Figure 18 is a plan view of an outlet cylinder screen for the biological filter shown in Figures 1 to 3;
Figure 19 is a side view of the outlet cylinder screen shown in Figure 18; Figure 20 is a perspective view of the outlet cylinder screen shown in
Figures 18 and 19;
Figure 21 is a side view of a filter handle on which the biological filter shown in Figures 1 to 3 is assembled; and
Figure, 22 is a perspective view the filter handle shown in Figure 21.
Description of the Example
An example of the invention will now be described with reference to a biological cartridge filter for use in an outlet of a sewage system immediately before a land application system.
In the following description of the example with reference to the drawings similar integers will be referred to using the same reference numbers.
The biological cartridge filter is generally indicated by arrow 1 in Figures 1 to 3. The filter in the example is an assembly formed from a star shaped in section columnar filter body 2 perforated with a plurality of holes which are shown in detail in Figures 11 and 12.
The assembly includes a cylindrical outlet screen chamber 3 (shown in detail in Figures 18 to 20) which is perforated with a plurality of holes, a filter handle 4 (shown in detail in Figures 21 and 22), a cap plate 5 (shown in detail in Figures 4 to 6), an interchange plate 6 (shown in detail in Figures 7 to 9), a star base plate 7 (shown in Figure 14 and 15), a base plate fixing assembly 8 (shown in detail in Figures 13 (a) and (b), 16 and 17) and connecting means 9 (shown only in Figure 1 and Figure 17).
The cap plate 5 (detailed in Figures 4 to 6) is formed with a recess 10 that is dimensioned and shaped to fit inside an upper end 11 of the cylindrical outlet screen chamber 3. The cylindrical outlet screen chamber 3 can have larger holes, for example holes which are elliptical in shape which are about 10mm high and 5mm wide, than the holes in the columnar filter body 2 so that an increased flow of clarified and screened effluent can pass from the biological filter. The inward flow of sewage into the filter body 2 occurs in the direction of arrow A in Figure 3 and is via the plurality of perforations in the screen body 2. The flow exits the filter in the direction of arrow B from the perforations in the outlet screen 3.
The interchange plate 6 (Figures 7 to 9) can be annular in plan with returns 12 and 13 on its inner and outer edges respectively. The return 12 is dimensioned so that it fits outside a lower end 14 of the cylindrical outlet chamber 3. The return 13 is dimensioned so that the face 15 of the plate 6 covers an upper end 16 of the columnar filter body 2.
The base plate fixing assembly 8 and associated star base plate 7 are adapted to cover a lower end 17 of the columnar filter body 2 and in association with the connecting means 9 (Figures 1 and 17) holds the biological filter base assembly together.
The base plate fixing assembly 8 can be formed in a number of parts including a fixing ring 18 (Figures 13(a), 13(b), 15 and 16) and a transverse member 19 (Figures 13 and 16). The base star plate 7 (Figure 14 and 15) sits on the transverse member 19 and is held against the lower end 17 of the filter body 2. The base star plate 7 can be perforated with holes of about 3mm diameter and in use the fixing ring 18 locates the star plate 7 over the lower end 17 of the columnar filter body 2 before it is fixed in position by the . connecting . means 9.
The base fixing plate assembly 8 locates the assembled biological filter together on a rod section 20 of the handle 4 with the base star plate 7 being fixed to the transverse member 19 by the connecting means 9. The rod section 20 has a transverse bar 21 (Figures 21 and 22) which guides the handle in a vertical direction to assist with positioning it into position in the columnar filter.
The material of choice for construction varies with the end use application. Waste water applications dictate the use of 316 stainless steel, however economics and application can require and allow a variety of materials such as; 304 stainless steel, brass, aluminium etc. to be used as required.
The arrangement is such that in use the handle 4 allows the filter cartridge to be removed and cleaned and if need be disassembled for maintenance or cleaning in which the star shaped in plan columnar filter 2 body increases the filtering capacity.
Where in the foregoing description particular mechanical integers are described it is envisaged that their mechanical equivalents can be substituted as if they were described.
Thus by this invention there is provided a biological cartridge filter for use with a sewage system or the like.
A particular example of the invention has been described and it is envisaged that improvements and modifications can take place without departing from the scope of the attached claims.

Claims

Claims
1. A biological filter for a sewage system, the filter including a columnar filter body perforated with a plurality of holes, the columnar filter body being star shaped in plan to thereby increase the filtering capacity by increasing the filter's surface area.
2. A biological filter as claimed in claim 1 wherein the biological filter is manufactured from stainless steel, such as 316 stainless steel.
3. A biological filter as claimed in claim 2 wherein the columnar filter body is generally mounted with its longitudinal axis vertical and is perforated with holes of about 3mm in diameter which provides a 50% open area in the filter body.
4. A biological filter as claimed in claim 3 wherein the perforations are incorporated for the full height of the filter body.
5. A biological filter as claimed in any one of the preceding claims wherein the filter body is mounted in association with an outlet chamber and a lifting handle to aid handling of the biological filter.
6. A biological filter as claimed in any one of the preceding claims wherein the outlet chamber is formed as a cylindrical column which can also be perforated by holes along its full length.
7. A biological filter for a sewage system, the filter including an assembly formed from a star shaped in section columnar filter body perforated with a plurality of holes, a cylindrical outlet chamber perforated with a plurality of holes, a handle, a cap plate, an interchange plate, a base plate and connecting means, the arrangement being such that the handle includes a rod on which in vertical order the cap plate, outlet chamber, interchange plate, columnar filter body and base plate are fitted before being locked together by the connecting means to form a biological filter assembly in which the star shaped in plan columnar filter body increases the capacity of the filter.
8. A biological filter as claimed in claim 7 wherein the cap plate is formed with a recess that fits inside an upper end of the cylindrical outlet chamber.
9. A biological filter as claimed in claim 7 or claim 8 wherein the interchange plate is annular in plan with returns on its inner and outer edges, the returns being dimensioned so that it fits inside a lower end of the cylindrical outlet chamber and at the same time covers the upper end of the columnar filter body.
10. A biological filter as claimed in any one of claims 7 to 9 wherein the base plate is adapted to cover the lower end of the columnar filter body and in association with the connecting means holds the assembly together.
11. A biological filter as claimed in any one of claims 7 to 10 wherein the base plate is formed in two parts from a base fixing plate and a base star plate.
12. A biological filter as claimed in claim 11 wherein the base fixing plate includes a fixing ring and transverse member which are fitted during manufacture to the base of the columnar filter.
13. A biological filter as claimed in claim 12 wherein the fixing ring and transverse member are adapted to locate the base star plate over the lower end of the columnar filter body.
14. A biological filter as claimed in any one of claims 11 to 13 wherein the base star plate is perforated with holes of about 3mm diameter and is held in position to the base fixing plate by connecting means.
15. A biological filter as claimed in any one of claims 11 to 13 wherein the base star plate is provided with a thumb screw or other connecting means to allow the star base plate to be removed for cleaning or maintenance.
16. A biological filter for a septic tank as claimed in claim 7 and substantially as hereinbefore described with reference to the accompanying drawings.
PCT/NZ2009/000242 2008-11-11 2009-11-10 A filter WO2010056128A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ572738A NZ572738A (en) 2008-11-11 2008-11-11 A star shaped biological cartridge filter with a handle
NZ572738 2008-11-11

Publications (1)

Publication Number Publication Date
WO2010056128A1 true WO2010056128A1 (en) 2010-05-20

Family

ID=42170121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2009/000242 WO2010056128A1 (en) 2008-11-11 2009-11-10 A filter

Country Status (2)

Country Link
NZ (1) NZ572738A (en)
WO (1) WO2010056128A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11577238B2 (en) 2017-03-02 2023-02-14 Hero Scientific Ltd. Testing for particulates
US11680877B2 (en) 2018-09-05 2023-06-20 Hero Scientific Ltd. Testing for particulates
US11885722B2 (en) 2021-01-06 2024-01-30 Hero Scientific Ltd. Filtration sampling devices

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB858661A (en) * 1956-12-05 1961-01-11 Nat Res Dev Improvements in or relating to the aeration of liquids
GB1096725A (en) * 1966-04-25 1967-12-29 Zurn Ind Inc Automatic strainer
US4552657A (en) * 1984-01-24 1985-11-12 Suisaku Kabushiki Kaisha Filter
US5667682A (en) * 1995-10-25 1997-09-16 Water Renewal Systems L.P. Self-cleaning filtration apparatus
US20080017574A1 (en) * 2006-01-20 2008-01-24 Hydrologix Systems, Llc Device for in situ bioremediation of liquid waste

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB858661A (en) * 1956-12-05 1961-01-11 Nat Res Dev Improvements in or relating to the aeration of liquids
GB1096725A (en) * 1966-04-25 1967-12-29 Zurn Ind Inc Automatic strainer
US4552657A (en) * 1984-01-24 1985-11-12 Suisaku Kabushiki Kaisha Filter
US5667682A (en) * 1995-10-25 1997-09-16 Water Renewal Systems L.P. Self-cleaning filtration apparatus
US20080017574A1 (en) * 2006-01-20 2008-01-24 Hydrologix Systems, Llc Device for in situ bioremediation of liquid waste

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11577238B2 (en) 2017-03-02 2023-02-14 Hero Scientific Ltd. Testing for particulates
US11890614B2 (en) 2017-03-02 2024-02-06 Hero Scientific Ltd. Testing for particulates
US11680877B2 (en) 2018-09-05 2023-06-20 Hero Scientific Ltd. Testing for particulates
US11885722B2 (en) 2021-01-06 2024-01-30 Hero Scientific Ltd. Filtration sampling devices
US11921018B2 (en) 2021-01-06 2024-03-05 Hero Scientific Ltd. Filtration sampling devices

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