Title of Invention	" A FILTER FOR A VEHICULAR SEWAGE SYSTEM"
Abstract	A filter for a vehicular Scwage sysitem that includes an elongated body (70) having a plurality of longtiudinal vares (74) and slots (72). The body is made from material able to support the growth of biological agents. The slots (72) sized to resist the passage of particles larger than about 0.04 inches. The filter are struetured for use with a vehicular sewage system having a treatment tank divided into an upper chamber and a lower Chamber by a membrane. The membrane has a plurality of filter openings in which the filters are disposed. The filters allow fluid waste and solid particles smaller than about 0.04 inch flow into the lower chamber Larger particles of solid waste are exposed to air in the upper chamber thereby allowing aerobic biological agents to process the solid waste. In use, the filter allows the liquid portion of wastewater to pass from an upper chamber of the treatment tank into a lower chamber.The solid waste particles are then consumed by an aerobic bacteria in the upper chamber.

Title of Invention

" A FILTER FOR A VEHICULAR SEWAGE SYSTEM"

Abstract

A filter for a vehicular Scwage sysitem that includes an elongated body (70) having a plurality of longtiudinal vares (74) and slots (72). The body is made from material able to support the growth of biological agents. The slots (72) sized to resist the passage of particles larger than about 0.04 inches. The filter are struetured for use with a vehicular sewage system having a treatment tank divided into an upper chamber and a lower Chamber by a membrane. The membrane has a plurality of filter openings in which the filters are disposed. The filters allow fluid waste and solid particles smaller than about 0.04 inch flow into the lower chamber Larger particles of solid waste are exposed to air in the upper chamber thereby allowing aerobic biological agents to process the solid waste. In use, the filter allows the liquid portion of wastewater to pass from an upper chamber of the treatment tank into a lower chamber.The solid waste particles are then consumed by an aerobic bacteria in the upper chamber.

Full Text	This invention relates to a filter for a vehicular wastewater treatment system and, more specifically, to a filter made from a synthetic material that isstructured to filter particles and support a biological agent, as well as the use thereof. 10 Background Information Vehicular wastewater treatment systems, such as systems used on trains, utilize a biological agent to breakdown solid waste. The biological agent istypically a coliform bacteria, an aerobic bacteria. The wastewater treatment system includes a toilet that is coupled to, and in fluid communication with, a treatment tank. The 15 treatnaeut tank is further coupled to, and fluid communication with a chlorinator assembly. Generally, wastewater, including solid particles, is flushed from the toilet into the treatment tank. in the tank, the wastewater passes through a filter that is disposed above the water level of the rank. The liquid portion of the wastewater paasses through the filter into the lower portion of the tank- the majority of the solid 20 waste particles, which are too large to pass through the filter, are trapped above the filter. The biological agent feeds on the solid waste, breaking the solid waste into liquids and gases. The gas is vented from the system and the liquid flows to the lower portion of the tank. Wastewater, and any liquid created by the biological agent, flow into the chlorinator for further treatment 25 The current filter used in the treatment tank employs natural redwood bark as both a filter media and as a substrate upon which, the biological agents grow. The bark is disposed in, and provide passage through, a membrane adjacent to, but spaced from, the bottom of the tank. However, the availability of bark is being reduced due to depletion and harvesting moratoriums, Additionally, the bark filters are not 30 compatible with anti-bacterial cleaning agents. That is, a cleaning agent used in the toilet passed through the filter after the toilet was flushed. The bark filter absorbed WO 2004/037382 PCT/US2003/000870 2- the cleaning agent and retarded the growth of the biological agent. Absorption of a strong cleaning agent ruined the filter and the filter would have to be replaced. There is, therefore, a need fora filter structured to replace the bark filter that traps solid particle in wastewater and supports the growth of biological agents. 5 There is a further need far a filter that will not absorb a cleaning agent. There is a further need for a filter that is compatible with the structure of existing treatment tanks of vehicular wastewater treatment systems. SUMMARY OF THE INVENTION 10 The disclosed "invention provides a synthetic filter for use in a vehicular waste treatment system. The synthetic filter is a replacement for the redwood bark filter. The synthetic filter is a generally solid cylindrical elongated body having a plurality of longitudinal comb-like slots and vanes to allow for liquid passage. There are preferably, two sets of longitudinal comb-like slots and vanes extending towards 15 opposite sides of the cylinder. The filter may also include two longitudinal channels. The channels are disposed on opposite sides of the filter from each other and about 90 degrees from the comb-like slots/vanes. The filter is structured to fit strugly in holes in the membrane between an upper chamber and a lower chamber in the treetment tank used in the present filter system. The filter is made from a flexible material and, 20 as such, the comb-like slots/varues may deform slightly as the filter is installed in the dam holes, When installed, the filter will allow a maximum particle size of about 0.04 inch to pass therethrough. the filter is made from a synthetic material. The synthetic, material may be a thermoplastic rubber, such as Santoprene®, Grade 64A manufactured by Advanced Elastomer Syslems, 388 S. Main St., Akron Ohio, 44311, 25 or a thermoplastic elastomer, such as Evoprene®, Grade G963, manufectured by Alpha Gary, Albis North America, P.O. Box 711, Rosenberg, TX 77471-0711. Such a synthetic material will not absorb a cleaning agent and, as such, accidental use of an antibacterial clearing agent in the toilet will not ruin the filter. It is an object of this invention to provide a filter structured to replace the bark 30 filter that traps solid particle in wastewater and supports the growth of biological agents WO 2004/037382 PCT/US2003/000870 3 It is a further object of this invention to provide a filter that will not absorb a cleaning agent It is a further object of this invention to provide a filter that is compatible with the structure of existing treatment tanks of vehicular wastewater treatment systems. 5 BRIEF DESCRIPTION OF THE DRAWINGS A full understanding of the invention can be gained from the following description of the preferred embodiments when nead in conjunction with the accompanying drawings in which: 10 Figure 1 is an isometric view of a vehicular waste treatment system. Figure 2 is a partially cut-away side view of a treatment tank. Figure 3 is a partially cut-away top view of a treatment tank. Figure 4 is an end view of the filter. Figure 5A is a first side view of the filter. Figure 5B is a second side view of 15 the filter rotated 90 degrees from the first side view. DESCRIPTION OF THE PREFERRED EMBODIMENTS As used herein, "wastewater" shall include both liquid waste and solid Waste, and any combination thereof. 20 As used herein, "support for a biological agent" shall mean physical support, such as a structure, and/or a surface that encourages the growth of biological organisms. As shown in Figure 1, a vehicular waste treatment system 10 includes one or more toilet assemblies 20, a treatment tank assembly 30, and a chlorinator system 60. 25 The toilet assemblies 20 are coupled to, and in fluid communication with, the treatment tank assembly 30 by conduits 22. The toilet assemblies 20 operate in a manner known in the art and collect wastewater which typically includes liquid waste such as water and urine as well as solid waste, such as feces and paper. When the toilet assemblies 20 are flushed, the wastewater is passed to the treatment tank 30 assembly 30 via conduirs 22. As shown in Figures 2 and 3. the treatment tank assembly 30 includes a tank assembly 32, a plurality of upper filter assemblies 34, a membrane 36, and a plurality WO 2004/037382 PCT/US2003/000870 4 of lower filters 38. The lank assembly 32 includes a top 40, a sidewall 42, and a bottom 44. An inlet port 45 through the top 40 or, as shown, through the sidewall 42 adjacent to the top 40- The inlet port 45 is coupled to, and in fluid communication with, the conduits 22, The membrane 36 is disposed adjacent to, but spaced from, the 5 tank assembly bottom 44. The membrane 36 extends across the entire interior of the tank, assembly 32 and, except for the filter openings 37, described below, is watertight. The membrane 36 includes a plurality of filtter openings 37. The filter openings 37 pfeferably have a diameter of about 1.5 inches. The membrane 36 divides the task assembly 32 into an upper chamber 46 and a lower chamber 48. The 10 lower filters 38, detailed herein after, extend through the filter openings 37. Thus, for wastewater to pass from the upper chamber 46 to the lower chamber 48, the wastewater must pass through a lower filter 38. The lower chamber 48 includes an exit port 50 which extends through the sidewall 42. An egress conduit 52 is coupled to, and in fluid communication with, the exit port 50. 15 The egress conduit 52 is further coupled to, and in fluid communication with, the chlorinator system 60, The chlorinator system 60 includes a tablet chamber 62 and a serpentine conduit 64. The tablet chamber 62 includes a tablet opening 66 where a user may insert chlorine tablets. The egress conduit 52 is, more specifically, coupled to, and in fluid communication with, the tablet chamber 62. The tablet 20 chamber 62 is further coupled to, and in fluid communication with, the serpentine conduit 64. The serpentine conduit 64 preferably extends in a zigzag pattern, below the treatment tank assembly 30 and includes a plurality of baffles (not shown) or other means for slowing the flow of wastewater. As shown in Figure 4, each lower filter 38 is made from a synthetic material, 25 preferably Santoprene, Each lower filter 38 includes an elongated body 70 which is, preferably, a generally solid cylinder. The elowgated body 70 preferably has a maximum diameter between about 1.4 and 1.8 inches, and more preferably aboul 1.6 inches. The elongated body 70 has a plurality of longitudinal comb-like slots 72 and vanes 74 to allow for liquid passage. There are, preferably a first set 76 and a second 30 set 78 of longitudinal comb-like slots 72 and vanes 74, The first and second set of longitudinal combs/vanes 76, 78 extend towards opposite sidas of the filter body 70. The lower filter 38 nay also include two longitudinal channels 80. The channels 80 WO 2004/037382 PCT/US2003/000870 5 are disposed on opposite sides of the filter body 70 from each other and about 90 degrees from the first and second set of longitudinal combs/vanes 76, 78, Each filter body 70 is structured to fit strugly in the filter openings 37. Each filter body 70 is made from a flexible, material and, as such, the first and second set of longitudinal 5 combs/vanes 76, 78 may deform slightly as the filter body 70 is installed in the filter openings 37. The vanes 74 are spaced about 0.09 inch apart, that is, the slots 72 have a width of about 0.09 inch. The interior end 82 of the slots 72, that is the end nearest a centerline extending between the first and second set of longitudinal combs/vanes 76, 73, is pointed. This shape allows the first and second, set of longitudinal 10 combs/vanes 76, 78 to be collapsed more easily as the filter body 70 is inserted into the filter opening 37. Because the elongated filter body 70 has a diameter that is larger than the filter openings 37. when the filter body 70 is installed in the membrane openings 37 the first and second set of longitudinal tombs/vanes 76. 78 are compressed so that the slots 72 have a width of about 0.04 inch. Thus, solid particles 15 having a diameter greater than about 0.04 inch cannot pass through the lower filters 38. The portion of the filter body 7.0 that, extends into the upper chamber 46 preferably extends at least about 2.5 inches above the membrane 36. The upper filter assemblies 34 are mounted in the upper chamber 46 and attached to the interior of the rank sidewall 42. The upper filter assemblies 34 include 20 a mounting bracket 90, a housing 92, and a plurality of upper filters 94. The upper filters 94 may have the same cross-sectional shape as the lower filters 38. The mounting bracket 90 couples the housing 92 to the tank side wall 42. The upper filters 94 are disposed in the housing 92. The housing 92 is water permeable. The upper filters 94 provide a substrate for the aerobic biological agent when the wastewater 25 level in the treatment task assembly 30 is above the top of the lower filters 38. The upper filters 94 may be disposed either horizontally or vertically within the upper filter assembly housing 92. In operation, wastewater is flushed from the toilet assemblies 20, via the conduits 22, into the treatment tank assembly 30. The wastewater moves to the 30 bottom of the upper chamber 46 and is disposed on top of rhe membrane 36- The liquid portion of the wastewater passes through the slots in the lower filters 38 into the lower chamber 48. Solid waste particles in the wastewater having a diameter of WO 2004/037382 PCT/US2003/000870 6 greater than about 0.04 inch will be blocked by the lower filters 38 and held in the upper chamber 46. An aerobic biological agent, such as a coliform bacteria, is present in the treatment rank assembly 30, or is introduced along with the wastewater. The biological agent breaks the solid waste partitles down into various liquids and gases, 5 The gases are vented from the treatment tank assembly 30 and the liquids pass through the lower filters 38 into the lower chamber 48. Wastewater and other liquids in the lower chamber 48 are passed on to the chlorinator system 60. The chlorinator system 60 allows the user to add chlorine tablets which will kill all biological agents as the wastewater passes through the serpentine conduit 64. After the wastewater 10 passes through the chlorinator system 60, the wastewater may be dumped or further treated if required, Typically, the liquid level in the upper chamber 46 will not rise above the top of the lower filters 38, As such, the aerobic biological agent on the lower filter 38 will usually be exposed to air. However, during times of high use, the treatment tank 15 assembly 30 may Fill so quickly that the liquid level in the upper chamber 46 rises above the top of the lower Filters 38. When this happens, the surface of the liquid in the upper chamber will be in contact with the upper filter assemblies 34. The aerobic biological agent is also disposed on the substrate of the upper filters 94 and will begin 10 process the solid waste particles floating at the top of the wastewater. 20 It will be appreciated that the present invention provides a filter structured to replace the bark filter that traps solid particle in wastewater. This filter is made from a material thai supports the growth of biological agents capable of consuming solid waste particles. The filter also will not absorb a cleaning agent and, as sucH, may be used for an expended period of time unlike the prior bark filters which could be 25 ruined if exposed to a cleaning agent While the filter is preferably used in a vehicular wastewater treatment tank, the filter May be used with stationary treatment tanks or other types of treatment tanks. While specific embodiments of the invention have been described in detail, it will be appreciated by those skilled in the art that various modifications and 30 alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be WO 2004/037382 PCT/US2003/000870 7 illustrative only and not limiting as to the scope of invention which is to ba given the, full breadth of the claims appended and any and all equivalents thereof. WO 2004/037382 PCT/US2003/000870 8 What is Claimed is: 1. A filter for a vehicular sewage system, said vehicular sewage system having a treatment tank divided into an upper chamber and a lower chamber by a membrane, said membrane having a plurality of filter openings, said filter comprising: an elongated body having a plurality of longitudinal vanes and slots; said body made from a material able to support the growth of biological agents; and said slots sized to resist the passage of particles larger than about 0.04 inches. 2. The filter of Claim I wherein, said filter is made from a material selected from the group consisting of: thermoplastic rubber or thermoplastic elastomers. 3. The filter of Claim 1 wherein, said vanes and slots are disposed in a comb-like configuration. 4. The filter of Claim 3 wherein, there are two sets of comb-like vanes and slots, said sets extending in generally opposite directions. 5. The filter of Claim 4 wherein, said elongated body is generally cylindrical and said sets of comb-like vanes and slots extend in directions that are about 180o apart 6. The filter of Claim 5 wherein, said body has a maximum diameter between about 1.4 and 1.8 inches 7. The filter of Claim 5 wherein, said body has a maximum diameter of about 1.6 inches. 8. The filter of Claim 5 wherein, said set of vanes and slots includes three vanes and four slots, WO 2004/037382 PCT/US2003/000870 9 9. The filter of Claim 8 wherein: said body has a diameter that is larger than said filter openings; said slots are between about 0.03 and 0.10 inch wide; and said slots structured to be compressed when said body is inserted into said filter opening. 10. The filter of Claim 8 wherein: said body has a diameter that is larger than said filter openings; said slots are about 0.09 inch wide: and said slots structured to be compressed when said body is inserted into said filter opening. 11. A vehicular sewage treatment system comprising: a toilct assembly: a wastewater conduit coupled to, and in fluid communication with, said toilet assembly; a treatment task assembly coupled to, and in fluid communication with, said wastewater conduit; said treatment tank assembly including an enclosure having a waste water inlet and an outlet, and at least one filter disposed within said treatment tank between said inlet and outlet; said filter comprising: an elongated body having a plurality of longitudinal vanes and slots; said body made from a material able to support the growth of biological agents; and said slots sized to resist the passage of particles terger than about 0.04 inches. 12. The filter of Claim 11 wherein, said filter is made from a material selected from the group consisting of thermoplastic rubber or thermoplastic elastomers. WO 2004/037382 PCT/US2003/000870 10 13. The filter of Claim 11 wherein, said vanes and slots are disposed in a comb-lie configuration. 14. The filter of Claim 13 wherein, there are two sets of comb-1ike vanes and slots, said sets extending in generally opposite directions. 15 - The filter of Claim 14 wherein. said elongated body is generally cylindrical and said sets of comb-like vanes and slots extend in directions that are about 180o apart. 16. The filter of Claim 15 wherein, said body has a maximum diameter between about 1.4 and 1.8 inches. 17. The filter of Claim 15 wherein, said body has a maximum diameter of about 1.5 inches. 18. The filter of Claim 15 wherein, said set of vanes and slots includes three vanes and four slots. 19. The filter of Claim 18wherein: said body has a diameter that is larger than said filter openings; said slots are between about 0.03 and 0.10 inch wide; and said slots structured to be compressed when said body is inserted into said filter opening. 20. The filter of Claim 18 wherein: said body has a diameter that is larger than said filter openings; said slots are about 0.09 inch wide; and said slots structured to be compreased when said body is inserted into said filter opening. WO 2004/037382 PCT/US2003/000870 11 21. A method of using a vehicular sewage treatment system comprising the steps of: a) providing a toilet assembly, a treatment tank assembly, a wastewater conduit disposed between and coupled 10, and in fluid communication with, said toilet assembly and said treatment tank assembly, said treatment tank assembly including an enclosure having an upper chamber and a lower chamber said upper chamber an lower chamber separated by a membrane having one or more filter openings, said treatment tank assembly further including a wastewater inlet and an outlet; b) providing filter having an elongated body having a plurality of longitudinal vanes and slots, said body made from a material able to support the growth of biological agents, and said slots sized to resist the passage of particles larger than about 0-04 inches; c) installing a said filter in each said filter opening within said treatment tank; d) utilizing said toilet assembly and flushing wastewater into said treatment tank; e) filtering, said wastewater through said filters so that solid waste particles remain in said upper chamber while liquid waste moves into said lower chamber; and f) allowing a biological agent to process said solid waste particles into gases and liquids. 22. The method of Claim 21 wherein said step of providing a filter includes the step of providing a filter made from a material selected from the group consisting of: thermoplastic rubber or thermoplastic elastomers. 23. The method of Claim 21 wherein said step of providing a filter includes the step of providing a filter with said vanes and slots disposed in a comb-lie configuration. 24. The method of Claim 23 wherein, there are two sets of comb-like vanes and slots, said sets extending in generally opposite directions. WO 2004/037382 PCT/US2003/000870 12 25. The method of Claim 23 wherein: said step of providing a treatment tank assembly with a membrane having filter openings indudes providing fitter openings that are about 1.5 inches in diameter or less; said step of pioviding a filter includes the step of providing a filter having a diameter that is larger than said filter openings; and said step of installing a said filter in each said filter opening further includes the step of compressing said filter into said filter opening so that the width of said slots is reduced. A filter for a vehicular Scwage sysitem that includes an elongated body (70) having a plurality of longtiudinal vares (74) and slots (72). The body is made from material able to support the growth of biological agents. The slots (72) sized to resist the passage of particles larger than about 0.04 inches. The filter are struetured for use with a vehicular sewage system having a treatment tank divided into an upper chamber and a lower Chamber by a membrane. The membrane has a plurality of filter openings in which the filters are disposed. The filters allow fluid waste and solid particles smaller than about 0.04 inch flow into the lower chamber Larger particles of solid waste are exposed to air in the upper chamber thereby allowing aerobic biological agents to process the solid waste. In use, the filter allows the liquid portion of wastewater to pass from an upper chamber of the treatment tank into a lower chamber.The solid waste particles are then consumed by an aerobic bacteria in the upper chamber.

Full Text

This invention relates to a filter for a vehicular wastewater treatment system
and, more specifically, to a filter made from a synthetic material that isstructured to
filter particles and support a biological agent, as well as the use thereof.
10 Background Information
Vehicular wastewater treatment systems, such as systems used on trains,
utilize a biological agent to breakdown solid waste. The biological agent istypically
a coliform bacteria, an aerobic bacteria. The wastewater treatment system includes a
toilet that is coupled to, and in fluid communication with, a treatment tank. The
15 treatnaeut tank is further coupled to, and fluid communication with a chlorinator
assembly. Generally, wastewater, including solid particles, is flushed from the toilet
into the treatment tank. in the tank, the wastewater passes through a filter that is
disposed above the water level of the rank. The liquid portion of the wastewater
paasses through the filter into the lower portion of the tank- the majority of the solid
20 waste particles, which are too large to pass through the filter, are trapped above the
filter. The biological agent feeds on the solid waste, breaking the solid waste into
liquids and gases. The gas is vented from the system and the liquid flows to the lower
portion of the tank. Wastewater, and any liquid created by the biological agent, flow
into the chlorinator for further treatment
25 The current filter used in the treatment tank employs natural redwood bark as
both a filter media and as a substrate upon which, the biological agents grow. The
bark is disposed in, and provide passage through, a membrane adjacent to, but spaced
from, the bottom of the tank. However, the availability of bark is being reduced due
to depletion and harvesting moratoriums, Additionally, the bark filters are not
30 compatible with anti-bacterial cleaning agents. That is, a cleaning agent used in the
toilet passed through the filter after the toilet was flushed. The bark filter absorbed

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the cleaning agent and retarded the growth of the biological agent. Absorption of a
strong cleaning agent ruined the filter and the filter would have to be replaced.
There is, therefore, a need fora filter structured to replace the bark filter that
traps solid particle in wastewater and supports the growth of biological agents.
5 There is a further need far a filter that will not absorb a cleaning agent.
There is a further need for a filter that is compatible with the structure of
existing treatment tanks of vehicular wastewater treatment systems.
SUMMARY OF THE INVENTION
10 The disclosed "invention provides a synthetic filter for use in a vehicular waste
treatment system. The synthetic filter is a replacement for the redwood bark filter.
The synthetic filter is a generally solid cylindrical elongated body having a plurality
of longitudinal comb-like slots and vanes to allow for liquid passage. There are
preferably, two sets of longitudinal comb-like slots and vanes extending towards
15 opposite sides of the cylinder. The filter may also include two longitudinal channels.
The channels are disposed on opposite sides of the filter from each other and about 90
degrees from the comb-like slots/vanes. The filter is structured to fit strugly in holes
in the membrane between an upper chamber and a lower chamber in the treetment
tank used in the present filter system. The filter is made from a flexible material and,
20 as such, the comb-like slots/varues may deform slightly as the filter is installed in the
dam holes, When installed, the filter will allow a maximum particle size of about
0.04 inch to pass therethrough. the filter is made from a synthetic material. The
synthetic, material may be a thermoplastic rubber, such as Santoprene®, Grade 64A
manufactured by Advanced Elastomer Syslems, 388 S. Main St., Akron Ohio, 44311,
25 or a thermoplastic elastomer, such as Evoprene®, Grade G963, manufectured by
Alpha Gary, Albis North America, P.O. Box 711, Rosenberg, TX 77471-0711. Such
a synthetic material will not absorb a cleaning agent and, as such, accidental use of an
antibacterial clearing agent in the toilet will not ruin the filter.
It is an object of this invention to provide a filter structured to replace the bark
30 filter that traps solid particle in wastewater and supports the growth of biological
agents

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3
It is a further object of this invention to provide a filter that will not absorb a
cleaning agent
It is a further object of this invention to provide a filter that is compatible with
the structure of existing treatment tanks of vehicular wastewater treatment systems.
5
BRIEF DESCRIPTION OF THE DRAWINGS
A full understanding of the invention can be gained from the following
description of the preferred embodiments when nead in conjunction with the
accompanying drawings in which:
10 Figure 1 is an isometric view of a vehicular waste treatment system.
Figure 2 is a partially cut-away side view of a treatment tank.
Figure 3 is a partially cut-away top view of a treatment tank.
Figure 4 is an end view of the filter.
Figure 5A is a first side view of the filter. Figure 5B is a second side view of
15 the filter rotated 90 degrees from the first side view.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
As used herein, "wastewater" shall include both liquid waste and solid Waste,
and any combination thereof.
20 As used herein, "support for a biological agent" shall mean physical support,
such as a structure, and/or a surface that encourages the growth of biological
organisms.
As shown in Figure 1, a vehicular waste treatment system 10 includes one or
more toilet assemblies 20, a treatment tank assembly 30, and a chlorinator system 60.
25 The toilet assemblies 20 are coupled to, and in fluid communication with, the
treatment tank assembly 30 by conduits 22. The toilet assemblies 20 operate in a
manner known in the art and collect wastewater which typically includes liquid waste
such as water and urine as well as solid waste, such as feces and paper. When the
toilet assemblies 20 are flushed, the wastewater is passed to the treatment tank
30 assembly 30 via conduirs 22.
As shown in Figures 2 and 3. the treatment tank assembly 30 includes a tank
assembly 32, a plurality of upper filter assemblies 34, a membrane 36, and a plurality

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of lower filters 38. The lank assembly 32 includes a top 40, a sidewall 42, and a
bottom 44. An inlet port 45 through the top 40 or, as shown, through the sidewall 42
adjacent to the top 40- The inlet port 45 is coupled to, and in fluid communication
with, the conduits 22, The membrane 36 is disposed adjacent to, but spaced from, the
5 tank assembly bottom 44. The membrane 36 extends across the entire interior of the
tank, assembly 32 and, except for the filter openings 37, described below, is
watertight. The membrane 36 includes a plurality of filtter openings 37. The filter
openings 37 pfeferably have a diameter of about 1.5 inches. The membrane 36
divides the task assembly 32 into an upper chamber 46 and a lower chamber 48. The
10 lower filters 38, detailed herein after, extend through the filter openings 37. Thus, for
wastewater to pass from the upper chamber 46 to the lower chamber 48, the
wastewater must pass through a lower filter 38. The lower chamber 48 includes an
exit port 50 which extends through the sidewall 42. An egress conduit 52 is coupled
to, and in fluid communication with, the exit port 50.
15 The egress conduit 52 is further coupled to, and in fluid communication with,
the chlorinator system 60, The chlorinator system 60 includes a tablet chamber 62
and a serpentine conduit 64. The tablet chamber 62 includes a tablet opening 66
where a user may insert chlorine tablets. The egress conduit 52 is, more specifically,
coupled to, and in fluid communication with, the tablet chamber 62. The tablet
20 chamber 62 is further coupled to, and in fluid communication with, the serpentine
conduit 64. The serpentine conduit 64 preferably extends in a zigzag pattern, below
the treatment tank assembly 30 and includes a plurality of baffles (not shown) or other
means for slowing the flow of wastewater.
As shown in Figure 4, each lower filter 38 is made from a synthetic material,
25 preferably Santoprene, Each lower filter 38 includes an elongated body 70 which is,
preferably, a generally solid cylinder. The elowgated body 70 preferably has a
maximum diameter between about 1.4 and 1.8 inches, and more preferably aboul 1.6
inches. The elongated body 70 has a plurality of longitudinal comb-like slots 72 and
vanes 74 to allow for liquid passage. There are, preferably a first set 76 and a second
30 set 78 of longitudinal comb-like slots 72 and vanes 74, The first and second set of
longitudinal combs/vanes 76, 78 extend towards opposite sidas of the filter body 70.
The lower filter 38 nay also include two longitudinal channels 80. The channels 80

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are disposed on opposite sides of the filter body 70 from each other and about 90
degrees from the first and second set of longitudinal combs/vanes 76, 78, Each filter
body 70 is structured to fit strugly in the filter openings 37. Each filter body 70 is
made from a flexible, material and, as such, the first and second set of longitudinal
5 combs/vanes 76, 78 may deform slightly as the filter body 70 is installed in the filter
openings 37. The vanes 74 are spaced about 0.09 inch apart, that is, the slots 72 have
a width of about 0.09 inch. The interior end 82 of the slots 72, that is the end nearest
a centerline extending between the first and second set of longitudinal combs/vanes
76, 73, is pointed. This shape allows the first and second, set of longitudinal
10 combs/vanes 76, 78 to be collapsed more easily as the filter body 70 is inserted into
the filter opening 37. Because the elongated filter body 70 has a diameter that is larger
than the filter openings 37. when the filter body 70 is installed in the membrane
openings 37 the first and second set of longitudinal tombs/vanes 76. 78 are
compressed so that the slots 72 have a width of about 0.04 inch. Thus, solid particles
15 having a diameter greater than about 0.04 inch cannot pass through the lower filters
38. The portion of the filter body 7.0 that, extends into the upper chamber 46
preferably extends at least about 2.5 inches above the membrane 36.
The upper filter assemblies 34 are mounted in the upper chamber 46 and
attached to the interior of the rank sidewall 42. The upper filter assemblies 34 include
20 a mounting bracket 90, a housing 92, and a plurality of upper filters 94. The upper
filters 94 may have the same cross-sectional shape as the lower filters 38. The
mounting bracket 90 couples the housing 92 to the tank side wall 42. The upper filters
94 are disposed in the housing 92. The housing 92 is water permeable. The upper
filters 94 provide a substrate for the aerobic biological agent when the wastewater
25 level in the treatment task assembly 30 is above the top of the lower filters 38. The
upper filters 94 may be disposed either horizontally or vertically within the upper
filter assembly housing 92.
In operation, wastewater is flushed from the toilet assemblies 20, via the
conduits 22, into the treatment tank assembly 30. The wastewater moves to the
30 bottom of the upper chamber 46 and is disposed on top of rhe membrane 36- The
liquid portion of the wastewater passes through the slots in the lower filters 38 into
the lower chamber 48. Solid waste particles in the wastewater having a diameter of

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greater than about 0.04 inch will be blocked by the lower filters 38 and held in the
upper chamber 46. An aerobic biological agent, such as a coliform bacteria, is present
in the treatment rank assembly 30, or is introduced along with the wastewater. The
biological agent breaks the solid waste partitles down into various liquids and gases,
5 The gases are vented from the treatment tank assembly 30 and the liquids pass
through the lower filters 38 into the lower chamber 48. Wastewater and other liquids
in the lower chamber 48 are passed on to the chlorinator system 60. The chlorinator
system 60 allows the user to add chlorine tablets which will kill all biological agents
as the wastewater passes through the serpentine conduit 64. After the wastewater
10 passes through the chlorinator system 60, the wastewater may be dumped or further
treated if required,
Typically, the liquid level in the upper chamber 46 will not rise above the top
of the lower filters 38, As such, the aerobic biological agent on the lower filter 38
will usually be exposed to air. However, during times of high use, the treatment tank
15 assembly 30 may Fill so quickly that the liquid level in the upper chamber 46 rises
above the top of the lower Filters 38. When this happens, the surface of the liquid in
the upper chamber will be in contact with the upper filter assemblies 34. The aerobic
biological agent is also disposed on the substrate of the upper filters 94 and will begin
10 process the solid waste particles floating at the top of the wastewater.
20 It will be appreciated that the present invention provides a filter structured to
replace the bark filter that traps solid particle in wastewater. This filter is made from
a material thai supports the growth of biological agents capable of consuming solid
waste particles. The filter also will not absorb a cleaning agent and, as sucH, may be
used for an expended period of time unlike the prior bark filters which could be
25 ruined if exposed to a cleaning agent While the filter is preferably used in a
vehicular wastewater treatment tank, the filter May be used with stationary treatment
tanks or other types of treatment tanks.
While specific embodiments of the invention have been described in detail, it
will be appreciated by those skilled in the art that various modifications and
30 alternatives to those details could be developed in light of the overall teachings of the
disclosure. Accordingly, the particular arrangements disclosed are meant to be

WO 2004/037382 PCT/US2003/000870
7
illustrative only and not limiting as to the scope of invention which is to ba given the,
full breadth of the claims appended and any and all equivalents thereof.

WO 2004/037382 PCT/US2003/000870
8
What is Claimed is:
1. A filter for a vehicular sewage system, said vehicular sewage system
having a treatment tank divided into an upper chamber and a lower chamber by a
membrane, said membrane having a plurality of filter openings, said filter comprising:
an elongated body having a plurality of longitudinal vanes and slots;
said body made from a material able to support the growth of biological
agents; and
said slots sized to resist the passage of particles larger than about 0.04 inches.
2. The filter of Claim I wherein, said filter is made from a material
selected from the group consisting of: thermoplastic rubber or thermoplastic
elastomers.
3. The filter of Claim 1 wherein, said vanes and slots are disposed in a
comb-like configuration.
4. The filter of Claim 3 wherein, there are two sets of comb-like vanes
and slots, said sets extending in generally opposite directions.
5. The filter of Claim 4 wherein, said elongated body is generally
cylindrical and said sets of comb-like vanes and slots extend in directions that are
about 180o apart
6. The filter of Claim 5 wherein, said body has a maximum diameter
between about 1.4 and 1.8 inches
7. The filter of Claim 5 wherein, said body has a maximum diameter of
about 1.6 inches.
8. The filter of Claim 5 wherein, said set of vanes and slots includes three
vanes and four slots,

WO 2004/037382 PCT/US2003/000870
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9. The filter of Claim 8 wherein:
said body has a diameter that is larger than said filter openings;
said slots are between about 0.03 and 0.10 inch wide; and
said slots structured to be compressed when said body is inserted into said
filter opening.
10. The filter of Claim 8 wherein:
said body has a diameter that is larger than said filter openings;
said slots are about 0.09 inch wide: and
said slots structured to be compressed when said body is inserted into said
filter opening.
11. A vehicular sewage treatment system comprising:
a toilct assembly:
a wastewater conduit coupled to, and in fluid communication with, said toilet
assembly;
a treatment task assembly coupled to, and in fluid communication with, said
wastewater conduit;
said treatment tank assembly including an enclosure having a waste water inlet
and an outlet, and at least one filter disposed within said treatment tank between said
inlet and outlet;
said filter comprising:
an elongated body having a plurality of longitudinal vanes and slots;
said body made from a material able to support the growth of
biological agents; and
said slots sized to resist the passage of particles terger than about 0.04
inches.
12. The filter of Claim 11 wherein, said filter is made from a material
selected from the group consisting of thermoplastic rubber or thermoplastic
elastomers.

WO 2004/037382 PCT/US2003/000870
10
13. The filter of Claim 11 wherein, said vanes and slots are disposed in a
comb-lie configuration.
14. The filter of Claim 13 wherein, there are two sets of comb-1ike vanes
and slots, said sets extending in generally opposite directions.
15 - The filter of Claim 14 wherein. said elongated body is generally
cylindrical and said sets of comb-like vanes and slots extend in directions that are
about 180o apart.
16. The filter of Claim 15 wherein, said body has a maximum diameter
between about 1.4 and 1.8 inches.
17. The filter of Claim 15 wherein, said body has a maximum diameter of
about 1.5 inches.
18. The filter of Claim 15 wherein, said set of vanes and slots includes
three vanes and four slots.
19. The filter of Claim 18wherein:
said body has a diameter that is larger than said filter openings;
said slots are between about 0.03 and 0.10 inch wide; and
said slots structured to be compressed when said body is inserted into said
filter opening.
20. The filter of Claim 18 wherein:
said body has a diameter that is larger than said filter openings;
said slots are about 0.09 inch wide; and
said slots structured to be compreased when said body is inserted into said
filter opening.

WO 2004/037382 PCT/US2003/000870
11
21. A method of using a vehicular sewage treatment system comprising the
steps of:
a) providing a toilet assembly, a treatment tank assembly, a wastewater
conduit disposed between and coupled 10, and in fluid communication with, said toilet
assembly and said treatment tank assembly, said treatment tank assembly including an
enclosure having an upper chamber and a lower chamber said upper chamber an
lower chamber separated by a membrane having one or more filter openings, said
treatment tank assembly further including a wastewater inlet and an outlet;
b) providing filter having an elongated body having a plurality of
longitudinal vanes and slots, said body made from a material able to support the
growth of biological agents, and said slots sized to resist the passage of particles
larger than about 0-04 inches;
c) installing a said filter in each said filter opening within said treatment
tank;
d) utilizing said toilet assembly and flushing wastewater into said
treatment tank;
e) filtering, said wastewater through said filters so that solid waste
particles remain in said upper chamber while liquid waste moves into said lower
chamber; and
f) allowing a biological agent to process said solid waste particles into
gases and liquids.
22. The method of Claim 21 wherein said step of providing a filter
includes the step of providing a filter made from a material selected from the group
consisting of: thermoplastic rubber or thermoplastic elastomers.
23. The method of Claim 21 wherein said step of providing a filter
includes the step of providing a filter with said vanes and slots disposed in a comb-lie
configuration.
24. The method of Claim 23 wherein, there are two sets of comb-like
vanes and slots, said sets extending in generally opposite directions.

WO 2004/037382 PCT/US2003/000870
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25. The method of Claim 23 wherein:
said step of providing a treatment tank assembly with a membrane having
filter openings indudes providing fitter openings that are about 1.5 inches in diameter
or less;
said step of pioviding a filter includes the step of providing a filter having a
diameter that is larger than said filter openings; and
said step of installing a said filter in each said filter opening further includes
the step of compressing said filter into said filter opening so that the width of said
slots is reduced.

A filter for a vehicular Scwage
sysitem that includes an elongated body (70)
having a plurality of longtiudinal vares (74) and
slots (72). The body is made from material
able to support the growth of biological agents.
The slots (72) sized to resist the passage of
particles larger than about 0.04 inches. The
filter are struetured for use with a vehicular
sewage system having a treatment tank divided
into an upper chamber and a lower Chamber by
a membrane. The membrane has a plurality of
filter openings in which the filters are disposed.
The filters allow fluid waste and solid particles
smaller than about 0.04 inch flow into the lower
chamber Larger particles of solid waste are
exposed to air in the upper chamber thereby
allowing aerobic biological agents to process
the solid waste. In use, the filter allows the
liquid portion of wastewater to pass from an
upper chamber of the treatment tank into a lower
chamber.The solid waste particles are then consumed by an aerobic bacteria in the upper chamber.

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Patent Number

219909

Indian Patent Application Number

00945/KOLNP/2005

PG Journal Number

20/2008

Publication Date

16-May-2008

Grant Date

14-May-2008

Date of Filing

20-May-2005

Name of Patentee

WABTEC HOLDING CORPORATION

Applicant Address

1001 AIR BRAKE AVENUE, WILMERDING, PA 15148, U.S.A.

Inventors:

#	Inventor's Name	Inventor's Address
1	NATALIZIA, MARK, L.	3049 PRIMROSE DRIVE, WILLITS, CA U.S.A.

PCT International Classification Number

B01D 29/44

PCT International Application Number

PCT/US2003/000870

PCT International Filing date

2003-01-10

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	10/277,457	2002-10-22	U.S.A.