US20120211443A1 - Zero-backwash liquid filter - Google Patents
Zero-backwash liquid filter Download PDFInfo
- Publication number
- US20120211443A1 US20120211443A1 US13/402,034 US201213402034A US2012211443A1 US 20120211443 A1 US20120211443 A1 US 20120211443A1 US 201213402034 A US201213402034 A US 201213402034A US 2012211443 A1 US2012211443 A1 US 2012211443A1
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- Prior art keywords
- liquid
- filter medium
- housing
- support membrane
- waste
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- 239000007788 liquid Substances 0.000 title claims abstract description 216
- 239000012528 membrane Substances 0.000 claims abstract description 96
- 238000001914 filtration Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002699 waste material Substances 0.000 claims description 81
- 239000002245 particle Substances 0.000 claims description 59
- 239000012530 fluid Substances 0.000 claims description 21
- 239000006194 liquid suspension Substances 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 17
- 239000007921 spray Substances 0.000 claims description 17
- 230000005484 gravity Effects 0.000 claims description 7
- 238000009827 uniform distribution Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 claims 5
- 239000013618 particulate matter Substances 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 238000004140 cleaning Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000004576 sand Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000009428 plumbing Methods 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
- B01D24/16—Upward filtration
- B01D24/165—Upward filtration the filtering material being supported by pervious surfaces
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Filtration Of Liquid (AREA)
Abstract
Methods and apparatus for filtering particulate matter from a liquid are provided. The apparatus comprise: a housing defining an internal volume; a liquid inlet port; a liquid outlet port disposed above the liquid inlet port; a filter medium support membrane housed within the housing and disposed between the liquid inlet port and the liquid outlet port; and a particulate filter medium loaded onto the filter medium support membrane. The apparatus are designed such that a flow of liquid introduced into the internal volume of the housing through the liquid inlet port and exiting the internal volume of the housing through the liquid outlet port will pass upward through the filter medium support membrane.
Description
- The present application claims priority to U.S. Provisional Patent Application No. 61/463,693 that was filed on Feb. 22, 2011, the entire contents of which is hereby incorporated by reference.
- Conventional sand water filter apparatus use a backwash step to periodically clean their filters. This backwash step can require a backwash rate of (10) gallons of water per square foot of surface area for removing the filtered waste. For example a common one (1) square foot sand filter would require a 10 gallon per minute flow rate for 30 minutes, resulting in the use of 300 gallons of water. In addition, some filters require a down rinse step to pack the filter bed with a filter medium, resulting in the use of even more water.
- Methods and apparatus for filtering particulate matter from a liquid are provided.
- One embodiment of the present methods provides a method of filtering a waste liquid comprising suspended waste particles using a filter apparatus comprising: a housing defining an internal volume; one or more liquid inlet ports defined by apertures in a wall of the housing; one or more liquid outlet ports defined by apertures in a wall of the housing, the one or more liquid outlet ports disposed above the one or more liquid inlet ports; a filter medium support membrane housed within the housing and disposed between at least one of the one or more liquid inlet ports and at least one of the one or more liquid outlet ports; and a particulate filter medium loaded onto the filter medium support membrane.
- In this embodiment, the method comprises introducing the waste liquid into the internal volume of the housing through at least one of the one or more liquid inlet ports, wherein a liquid flow pattern is established that carries the waste liquid in an upward direction through the filter medium loaded onto the support membrane and out of the internal volume of the housing through at least one of the one or more liquid outlet ports. In this process, a first portion of the waste particles is carried with the waste liquid into the filter medium support membrane, where the particles are filtered out of the waste liquid by the filter medium. A second portion of the waste particles, having a higher average particle mass (and, generally, a larger average particle diameter) than the first portion of waste particles, falls to the bottom of the housing, under gravity, without being carried into the filter medium support membrane. This is advantageous because it prevents heavier, larger particles from entering and clogging the loaded filter membrane. Once the waste liquid has been filtered in this matter, the introduction of the waste liquid into the internal volume of the housing is discontinued and the waste liquid remaining in the housing is drained. The loaded filter medium support membrane is then rinsed with a suitable rinsing liquid, such as water, to release spent particulate filter medium. Next, a liquid suspension of unspent (i.e., clean) particulate filter medium is introduced into the internal volume of the housing through one of the one or more liquid inlet ports, wherein the liquid suspension flows upward through the support membrane. As the liquid suspension passes through the filter medium support membrane, the suspended particulate filter medium is loaded onto the filter medium support membrane, thereby recharging the filter membrane.
- One embodiment of the present filtering apparatus provides: a housing defining an internal volume; one or more liquid inlet ports defined by apertures in a wall of the housing; one or more liquid outlet ports defined by apertures in a wall of the housing, the one or more liquid outlet ports disposed above the one or more liquid inlet ports; and a filter medium support membrane housed within the housing. The filter medium support membrane is disposed between at least one of the one or more liquid inlet ports and at least one of the one or more liquid outlet ports, such that a flow of liquid introduced into the internal volume of the housing through said at least one liquid inlet port and exiting the internal volume of the housing through said at least one liquid outlet port will pass upward through the filter medium support membrane. The apparatus further comprises a filter medium source comprising a liquid suspension of a particulate filter medium and a filter medium charging tube comprising an inlet aperture in fluid communication with the filter medium source and an outlet aperture disposed within the housing, below the filter medium support membrane. Together, the filter medium source and the filter medium charging tube are configured such that a flow of the liquid suspension of particulate filter medium from the filter medium source can be introduced into the internal volume of the housing through the output aperture of the filter medium charging tube. Prior to exiting the internal volume of the housing through at least one of the liquid outlet ports, the flow of suspended filter medium particles will pass upward through the filter medium support membrane, thereby loading the support membrane with the particulate filter medium. The apparatus may further include a drain port defined by an aperture in a wall of the housing, such as the housing floor, and configured to release liquid from the internal volume of the housing. (Note, as used herein, the term “wall” is a general term that can refer to a side wall, a bottom wall—such as a floor of the housing, or a top wall—such as a housing cover.) In addition, the apparatus may include an air vent in communication with the internal volume of the housing and configured to introduce air into the internal volume of the housing during a drain down cycle.
- Some embodiments of the filter apparatus include a rinsing liquid source comprising a rinsing liquid suitable for rinsing particulate filter medium out of the filter medium support membrane and a shower wand housed within the housing and disposed below the filter medium support membrane. The shower wand, which comprises a tube defining an internal bore and having a plurality of spray ports disposed along its length, is in fluid communication with the rinsing liquid source through one of the one or more liquid inlet ports and is rotatable around its longitudinal axis, such that a rinsing liquid can be introduced into the shower wand and sprayed out of the plurality of spray ports. The resulting liquid spray can be directed at the filter medium support membrane and various internal surfaces of the filter apparatus housing in order to release filter medium particles from the support membrane and to rinse the filter medium particles out of the housing.
- In some embodiments of the filter apparatus, the filter medium charging tube is itself composed of multiple tube components, including a movable inlet extension tube. The movable inlet extension tube is disposed within the housing and configured such that it can be moved from a first position, in which its internal bore is not aligned with a liquid inlet port, to a second position, in which its internal bore is aligned with a liquid inlet port, such that when the movable inlet extension tube is in the second position it is in fluid communication with the filter medium source through said liquid inlet port.
- The use of a movable inlet extension tube is advantageous because it allows a single liquid inlet port to be used as the point of introduction for different liquids during different operational cycles. For example, in the embodiment described above, a liquid inlet port can be configured such that it is in fluid communication with a waste liquid source comprising a liquid containing waste particles to be filtered and also in fluid communication with a filter medium source containing a filter medium particles suspended in a liquid. During the filter cycle, when the inlet extension tube is in the first position, it is not aligned with the liquid input port and, therefore, a waste liquid from the waste liquid source can be passed directly into the internal volume of the housing through said inlet port without passing through the filter medium charging tube. However, during a filter medium charging cycle, when the inlet extension tube is in the second position, it is aligned with the liquid inlet port, such that a liquid suspension of particulate filter medium from the filter medium source can be passed into the filter medium charging tube (and, ultimately, into the internal volume of the housing) through that liquid inlet port.
- In some embodiments, the filter medium charging tube comprises a U-shaped segment and further comprises a particle diffuser attached to its output aperture, whereby the diffuser is positioned and configured such that, as a particulate filter medium in a liquid suspension passes into the housing through the output aperture, the particulate filter medium will flow upward through the filter medium support membrane and provide a substantially uniform distribution of the particulate filter medium on the filter medium support membrane.
- In embodiments of the filter apparatus that include both the shower wand and the movable inlet extension tube, the movable inlet extension tube can be attached to the shower wand, such that the movable inlet extension tube is moved from the first position to the second position by rotating the shower wand around its longitudinal axis.
- Other principal features and advantages of the invention will become apparent to those skilled in the art upon review of the following drawings, the detailed description, and the appended claims.
- Illustrative embodiments of the invention will hereafter be described with reference to the accompanying drawings, wherein like numerals denote like elements.
-
FIG. 1 is a schematic diagrams of a partially cut-away side view of a filter apparatus. -
FIG. 2 is a schematic diagrams of a perspective side view of the filter apparatus ofFIG. 1 . -
FIG. 3 shows a filter apparatus with the components positioned for a service (filtering) cycle. -
FIG. 4 depicts the filter apparatus with the components positioned for a drain down cycle. -
FIG. 5 depicts the filter apparatus with the components positioned for a shower cycle. -
FIG. 6 depicts the filter apparatus with the components positioned for a filter medium charging cycle. -
FIG. 7 depicts the filter apparatus after the components have been repositioned from the filter medium charging cycle back to the service cycle. -
FIG. 8 depicts an enlarged view of the filter bed comprising the filter medium and the support membrane in the filter apparatus. -
FIG. 9 depicts an enlarged view of a mechanism for rotating an inlet extension tube between its service position and its filter medium charging position. - Apparatus and methods for filtering waste particles from a liquid, such as water, are provided.
- The filter apparatus have the ability to separate heavy solids from lighter weight solids in a fluid stream before the heavy solids are passed through a filter medium. As a result, the filter apparatus require no backwashing to clean the filter medium and, thus, can save a tremendous amount of water for each cleaning cycle. In addition, the present filter designs can satisfy the need for a water filter that requires a minimum of “down” time for cleaning.
- The filter apparatus have an up flowing filter design, wherein a filter medium is disposed below a supporting membrane when the filter apparatus is operating in the service (filtering) position. When filtering a liquid, such as water, light weight particles in the liquid are carried upward and trapped by the filter medium when the liquid is passed upward, thought the filter medium, and eventually out through a service outlet. Heavy particles, such as sand, will settle to the bottom of the filter apparatus, rather than passing upward through the filter medium and, thus, do not clog the filter medium. As such the present filter apparatus is an improvement on conventional down flow-type sand filters in which sand or other heavy particles flow into and can clog a filter medium rapidly.
- The filter apparatus can be operated on a very low water pressure rating or, conversely, can be operated on high pressure. For example, in some embodiments, the filter apparatus are operated at a pressure of around 5 p.s.i.g. or lower. While in other illustrative embodiments, the filter apparatus can be operated at pressures around a conventional line pressure of 125 p.s.i.g. or greater. However, the filter apparatus are also adaptable to other water pressure ranges.
- The filter apparatus can use diatomaceous earth (from this point called “DE”) as a filter medium in a manner that produces little or no waste and can be cleaned manually or automatically. However, other particulate filter media can be used provided they are capable of filtering waste particles from a given waste liquid stream. Some such filter media will have equivalent or substantially equivalent densities, size and filtering capacity as DE.
- An illustrative embodiment of a filter apparatus, including illustrative embodiments of the various components of the apparatus, in various stages of operation, are shown in
FIGS. 1-9 . -
FIGS. 1 and 2 are schematic diagrams of a partially cut-away side view and a perspective side view of a filter apparatus, respectively. The filter apparatus includes ahousing 102 that can be either of welded construction or injection molded.Housing 102 includes abody 103 and acover 105 fastened together by a plurality offasteners 107.Housing 102 houses afilter membrane shelf 109 that supports a filtermedium support membrane 104 comprising a material into or onto which a filter medium can be loaded. One example of a suitable support membrane material is a plastic woven material. A filter medium, such as DE, 106 is loaded onto, and packed against,support membrane 104 during a charging cycle, as discussed in more detail below. The size ofsupport membrane 104 can be of any scale to support the required flow rate. By way of illustration only, the approximate size of the support membrane depicted in this embodiment of the filter apparatus is 17 inches wide×20 inches long. Cover 105 has a continuous rib positioned around the periphery, which is configured to holdsupport membrane 104 againstfilter membrane shelf 109. Cover 105 also has downwardly extending internal ribs 108 (best shown inFIG. 3 ) that are positioned cross ways to holdsupport membrane 104 flat during the up flow filtering process.Rib apertures 113 of various shapes and sizes can be defined in the ribs in order to facilitate the flow of a liquid after it has passed through the filter medium. - The filter apparatus further comprises a main
liquid inlet port 110 defined by an aperture in the wall ofbody 103 and configured to introduce a stream of liquid into the internal volume defined byhousing 102.Inlet port 110 is in fluid communication with aninlet stub 111, which is an annular tube extending frominlet port 110 intobody 103. The apparatus further comprises a showerwand inlet port 112 defined by an aperture in the wall ofbody 103 and configured to introduce a stream of liquid into ashower wand 114, which is housed withinhousing 102.Shower wand 114, which comprises an annular tube having a plurality ofspray ports 116 along its length, is configured to oscillate back and forth around its longitudinal axis during a showering cycle. Rotatably attached toshower wand 114 is anextension inlet tube 118.Extension inlet tube 118 is configured such that—when the filter apparatus is in a filter medium charging cycle (see FIG. 6)—one end of its inner bore aligns with the inner bore ofinlet stub 111 and the other end of its inner bore aligns with the inner bore at oneend 119 of a “U-shaped”tube 120, wherein the oneend 119 extends intobody 103 and is disposedopposite inlet stub 111. “U-shaped”tube 120 also has adiffuser baffle 122 located at its other (lower)end 123, which is configured to distribute filter medium evenly during the filter medium charging cycle. - Located at the bottom of
housing 102 is adrain port 124, defined by an aperture in the lower wall (i.e., floor) ofbody 103, which houses adrain plug 126. Driving the rotation ofshower wand 114 is anelectric motor 128. Opening andclosing drain plug 126 is asolenoid 130. - External to
housing 102 are various annular tubes (e.g., pipes or tubing) configured to deliver various fluids into the housing or to remove fluids from the housing. For example, amain inlet tube 132 in fluid communication with the internal volume ofhousing 102 through mainliquid inlet port 110 can be used to deliver a liquid to be filtered (i.e., a waste liquid) intohousing 102 when the filter apparatus is in service.Main inlet tube 132 can also be used to deliver a liquid suspension of particulate medium to the support membrane while the apparatus is in a filter medium charging cycle. Similarly, a showerwand inlet tube 134, which is in fluid communication withshower wand 114 through showerwand inlet port 112, can be used to deliver a rinsing liquid, such as water, to showerwand 114 when the apparatus is in a shower cycle. The flow of liquids throughmain inlet tube 132 and showerwand inlet tube 134 can be controlled bymain inlet valve 131 and showerwand inlet valve 133. Amain outlet tube 138, which is in fluid communication with the internal volume ofhousing 102 through one or moreliquid outlet ports body 103, can be used to allow a liquid to exithousing 102 after it has passed throughfilter medium 116. Finally, adrain tube 144 in fluid communication with the internal volume ofhousing 102 throughdrain port 124 can be used to allow liquids to drain out of through the bottom of the housing. - A pump (not shown) can be used to deliver fluids, such as water, to the filter apparatus through, for example,
main inlet tube 132. The pump is desirably connected to a filter medium source which charges a particulate filter medium into a liquid being pumped throughmain inlet tube 132 in order to provide a liquid suspension of filter medium. This liquid suspension can be used to charge and recharge the filter medium, as discussed in more detail below. Alternatively, an automatic filter medium measuring unit can be use to inject the filter medium into the liquid at the correct time. - Control of the entire filter function can be accomplished using a programmable controller or a suitable mechanical timer. The filter medium cleaning cycle can be triggered by a pressure switch. In embodiments that include a pressure switch, the switch will trigger a cleaning cycle when the pressure in the filter apparatus increases because of a dirty filter medium bed. Alternatively, a mechanical timer may be used to schedule periodic cleaning cycles.
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FIGS. 1 and 2 are intended to illustrate the components of a filter apparatus without regard to a particular operational cycle.FIGS. 3-8 depict the filter apparatus in configuration for different operational cycles, each of which is described below. Briefly,FIG. 3 shows the filter apparatus with the components positioned for the service (filtering) cycle;FIG. 4 depicts the filter apparatus with the components positioned for the drain down cycle;FIG. 5 depicts the filter apparatus with the components positioned for the shower cycle;FIG. 6 depicts the filter apparatus with the components positioned for the filter medium charging cycle;FIG. 7 depicts the filter apparatus after the components have been repositioned from the filter medium charging cycle back to the service cycle. In addition,FIG. 8 depicts an enlarged view of the filter bed comprising the filter medium and the support membrane in the filter apparatus. Finally,FIG. 9 depicts an enlarged view of a mechanism for rotatinginlet extension tube 118 between its service position and its filter medium charging position. - The Service Cycle:
-
FIG. 3 shows a partially cut-away side view of the filter apparatus configured to filter particulate matter from a liquid during the service cycle. During the service cycle (also referred to as the service mode), the filter bed, which comprises the filter medium and the support membrane, has been charged with the filter medium and is filtering a liquid. The flow of a liquid being filtered is represented by the arrows in the figure. As shown, a liquid comprising particulate matter to be filtered flows throughmain inlet pipe 132 intohousing 102 throughliquid inlet port 110 andinlet stub 111. The flow pattern established by the configuration of the apparatus and the fluid pressure within the apparatus creates an upward flow in the liquid (represented by the upwardly directed arrows in the figure), which carries the liquid throughfilter medium 106 andsupport membrane 104 and then out ofhousing 102 through mainliquid outlet ports filter medium 106 ontosupport membrane 104. Before the flow of the liquid carries them to the filter bed,heavier particles 146 in the liquid fall downward to the floor ofhousing 102 and, therefore, do not enter and clog the filter bed. Lighter particles, which are generally smaller than the heavier particles, travel upward with the flow of the liquid and are trapped byfilter medium 106. As a result, the subsequent cleaning cycle performance is maximized because the heavier particles fall and settle to the bottom and only the lighter debris rises with the liquid flow and is filtered from the liquid by the filter bed. - (In order to more clearly show the upflow of the liquid after it enters
housing 102 the middle section ofshower wand 114 andinlet extension tube 118 have been removed fromFIG. 3 , as well as fromFIG. 4 . However, these components are shown in position inFIG. 6 , discussed below.) - The Drain Down Cycle:
- When the surface of the filter medium becomes dirty, the cleaning phase can begin.
FIG. 4 shows a side view of the of the filter apparatus releasing spent filter medium from the support membrane during the first part of the cleaning phase, the drain down cycle. - During the drain down cycle, the flow of liquid established during the service cycle is stopped.
Drain port 124 at the bottom ofhousing 102 opens and the liquid remaining inhousing 102 rapidly flows downdrain tube 144 under the force of gravity. At the same time theparticulate filter medium 106 released fromsupport membrane 104 and containing lighter filtered waste particles flows outdrain port 124 with the fluid. Anair vent 148, which can be, for example, a check valve plumbed to the outlet, lets air in to replace the liquid and aids in rapid liquid removal. During this cycle,support membrane 104 sags when the upflow of the liquid is replaced by the downward flow of air. When this happens, the weaving of the fibers ofsupport membrane 104 tend to roll away from each other and un “pinch” (release) any filter medium particles which may have become wedged in between the fibers during the filtering cycle. After the liquid and filter medium are removed fromhousing 102, the drain port remains open and the apparatus is ready for the next part of the cleaning phase, the shower cycle, to begin. - The Shower Cycle:
- During the shower cycle, the remaining debris (e.g., heavy particulate waste and particulate filter medium) is rinsed out of
housing 102. This is a rapid process, which can take place in ten to eighteen seconds, or less.FIG. 5 shows a side view of the of the filter apparatus configured to carry out the shower cycle. - During the shower cycle,
shower inlet tube 134 is pressurized with a rinsing liquid, such as water, which flows into the internal bore ofshower wand 114 through showerwand inlet port 112 and out through spray ports 116 (also referred to as holes) located along the length of the shower wand. During the shower cycle,shower wand 114 oscillates back and forth around the longitudinal axis running through its internal bore, thus spraying the underside ofsupport membrane 104 to help remove remaining filter medium particles. The oscillating liquid spray also strikes portions of the internal side walls ofhousing 102.Additional spray ports 150 on the bottom side ofspray wand 114 can be used to spray the bottom half of the internal side walls and the floor ofhousing 102. The floor ofhousing 102 is sprayed on each of the ends in order to flush the remaining debris to the center of the housing floor and downdrain tube 144. - The Filter Medium Charging Cycle:
- After the shower cycle is completed, a change in the internal plumbing of the filtering apparatus takes place, wherein
inlet extension tube 118 is moved from a first, non-functioning position, in which its opposing ends are not connected to other tubes, to a second, operational position in which one of its ends is aligned with the end ofinlet stub 111 and its other end is aligned withend 119 ofU-shaped tube 120. In this operational position (shown inFIG. 6 ),inlet stub 111,inlet extension tube 118 andU-shaped tube 120 together form an inlet tube assembly (also referred to as a filter medium charging tube) configured such that a liquid introduced intohousing 102 throughinlet port 110 will flow throughinlet stub 111, throughinlet extension tube 118, intoend 119 ofU-shaped tube 120 and out through theother end 123 ofU-shaped tube 120. This change in internal plumbing can take place rapidly. For example, in some embodiments, it takes place in about 5 seconds or less. - After
inlet extension tube 118 is aligned withinlet stub 111 andU-shaped tube 120,housing 102 begins to fill from the bottom with liquid suitable for delivering a particulate filter medium to the support membrane (i.e., a charging liquid) through the inlet tube assembly. When the housing is nearly full, unspentparticulate filter medium 106′ is introduced into the liquid traveling through the inlet tube assembly, as indicated by the arrows inFIG. 6 .Filter medium 106′, suspended in the liquid, travels throughinlet stub 111, throughinlet extension tube 118 and into “U-shaped”tube 120. The liquid and suspended filter medium then pass outdiffuser 122 and are distributed in all directions in an upward fashion, carried by the upflow of the liquid. The flow of liquid travels upward and passes throughsupport membrane 104 at which time the particles of filter medium 106′, which are too large to pass through the membrane, are collected evenly on the membrane while the charging liquid passes through the membrane and out through mainliquid outlet ports - The filter apparatus is desirably plumbed so that a closed liquid flow loop is formed and the charging liquid (e.g., water) constantly recirculates from the main
liquid outlet ports liquid inlet port 110 while the support membrane is being charged with the filter medium. The duration of the charging cycle is desirably long enough to create a layer of charging medium with a substantially uniform thickness sufficient to provide the quality of water desired for a given application (i.e., the more filter medium deposited, the cleaner the resulting filtered water). By way of illustration, approximately one sixteenth of an inch of DE will yield about five micron filtered water. If more DE is introduced, the average particle size in the effluent will we lower. - Transitioning Back to the Service Cycle:
- After the unspent filter medium has been introduced and packed against the lower surface of
support membrane 104, the inlet tube assembly can be disassembled withinhousing 102 in order to reconfigure the filter apparatus for its service cycle, as shown inFIG. 7 . This can be done using showerwand drive motor 128.Motor 128 rotatesshower wand 114, which hasinlet extension tube 118 attached thereto, several degrees around its longitudinal axis, such thatinlet extension tube 118 is rotated sideways in arc about said axis. Once this rotation is completed, a liquid to be filtered can flow unrestricted through mainliquid inlet port 110 into the internal volume ofhousing 102, after it exits through the distal end ofinlet stub 111. The remaining filter medium particles that haven't become packed againstsupport membrane 104 and are still flowing around inside the liquid within the filter apparatus will become disturbed, caught in the liquid flow and then packed onto the filter bed. This reconfiguration into the service cycle position can be carried out rapidly. For example, in some embodiments the reconfiguration can be carried out in about fifteen seconds, or less -
FIGS. 8 and 9 provide cross-sectional side views of portions of the filter apparatus in order to better illustrate the filter bed and the inlet extension tube rotation mechanism of the filter apparatus shown inFIGS. 1-7 . -
FIG. 8 shows particles offilter medium 106 packed intosupport membrane 104. Liquid flow through the packed support membrane is represented by the wavy arrows in the figure. As shown, the liquid flows upward through packedsupport membrane 104 where a portion of particle waste in the liquid is filtered out byfilter medium 106. The filtered liquid then flows throughrib apertures 113 and out ofhousing 102 throughoutlet port 142. -
FIG. 9( a) shows a side view ofextension inlet tube 118 configured for the service cycle. In the embodiment depicted here,extension inlet tube 118 is attached toshower wand 114 by a series (e.g., two or more) hooks 160 such that the rotation ofshower wand 114 around it internal longitudinal axis causesextension inlet tube 118 to rotate in an arc around that axis. In the configuration shown inFIG. 9( a),shower wand 114 is positioned such that theinternal bore 162 ofinlet extension tube 118 is displaced from (i.e., not aligned with) theinternal bore 164 ofend 119 ofU-shaped tube 120 and from the internal bore of inlet stub 111 (not shown here). -
FIG. 9( b) shows a side view ofextension inlet tube 118 configured for the filter medium charging cycle. In this configuration,shower wand 114 is positioned such that theinternal bore 162 ofinlet extension tube 118 is aligned with theinternal bore 164 ofend 119 ofU-shaped tube 120 and with the internal bore ofinlet stub 111 to provide an assembled filter medium charging tube. - The word “illustrative” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “illustrative” is not necessarily to be construed as preferred or advantageous over other aspects or designs. Further, for the purposes of this disclosure and unless otherwise specified, “a” or “an” means “one or more”. Still further, the use of “and” or “or” is intended to include “and/or” unless specifically indicated otherwise.
- The foregoing description of illustrative embodiments of the invention has been presented for purposes of illustration and of description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention. The embodiments were chosen and described in order to explain the principles of the invention and as practical applications of the invention to enable one skilled in the art to utilize the invention in various embodiments and with various modifications as suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.
Claims (13)
1. A filter apparatus for filtering particles from a liquid, the apparatus comprising:
(a) a housing defining an internal volume;
(b) one or more liquid inlet ports defined by apertures in a wall of the housing;
(c) one or more liquid outlet ports defined by apertures in a wall of the housing, the one or more liquid outlet ports disposed above the one or more liquid inlet ports;
(d) a filter medium support membrane housed within the housing and disposed between at least one of the one or more liquid inlet ports and at least one of the one or more liquid outlet ports, such that a flow of liquid introduced into the internal volume of the housing through said at least one liquid inlet port and exiting the internal volume of the housing through said at least one liquid outlet port will pass upward through the filter medium support membrane;
(e) a filter medium source comprising a liquid suspension of a particulate filter medium;
(f) a filter medium charging tube comprising an inlet aperture in fluid communication with the filter medium source and an outlet aperture disposed within the housing below the filter medium support membrane, such that a flow of the liquid suspension of particulate filter medium introduced into the internal volume of the housing through the output aperture of the filter medium charging tube and exiting the internal volume of the housing through at least one liquid outlet port will pass upward through the filter medium support membrane, thereby loading the support membrane with the particulate filter medium;
(g) a drain port defined by an aperture in a wall of the housing and configured to release liquid from the internal volume of the housing; and
(h) an air vent in communication with the internal volume of the housing and configured to introduce air into the internal volume of the housing.
2. The apparatus of claim 1 , further comprising:
(g) a rinsing liquid source comprising a rinsing liquid suitable for rinsing particulate filter medium out of the filter medium support membrane; and
(h) a shower wand housed within the housing below the filter medium support membrane, the shower wand comprising a tube having a plurality of spray ports disposed along its length, wherein the shower wand is in fluid communication with the rinsing liquid source through one of the one or more liquid inlet ports and is rotatable around its longitudinal axis, such that a rinsing liquid introduced into the shower wand and sprayed out of the plurality of spray ports can be directed at the filter medium support membrane.
3. The apparatus of claim 1 , wherein the filter medium charging tube comprises a movable inlet extension tube disposed within the housing and configured such that it can be moved from a first position, in which its internal bore is not aligned with a liquid inlet port, to a second position, in which its internal bore is aligned with a liquid inlet port, such that when the movable inlet extension tube is in the second position it is fluid communication with the filter medium source through said liquid inlet port.
4. The apparatus of claim 3 , wherein the liquid inlet port, with which the internal bore of the movable inlet extension tube is aligned when it is in the second position, is in fluid communication with a waste liquid source comprising a liquid having waste particles suspended therein, such that the waste liquid can be passed into the internal volume of the housing through said inlet port when the movable inlet extension tube is in the first position and the liquid suspension of particulate filter medium can be passed into the internal volume of the housing, through the inlet extension tube, when the inlet extension tube is in the second position.
5. The apparatus of claim 4 , wherein the filter medium charging tube comprises a U-shaped segment and further comprises a particle diffuser attached to its output aperture, whereby the diffuser is positioned and configured such that particulate filter medium in a liquid suspension of particulate filter medium, introduced into the housing through the output aperture, will flow upward and provide a substantially uniform distribution of the particulate filter medium on the filter medium support membrane.
6. The apparatus of claim 2 , wherein the filter medium charging tube comprises a movable inlet extension tube disposed within the housing and configured such that it can be moved from a first position, in which its internal bore is not aligned with a liquid inlet port, to a second position, in which its internal bore is aligned with a liquid inlet port, such that when the movable inlet extension tube is in the second position it is fluid communication with the with the filter medium source through said liquid inlet port.
7. The apparatus of claim 6 , wherein the movable inlet extension tube is attached to the shower wand, such that the movable inlet extension tube can be moved from the first position to the second position by rotating the shower wand around its longitudinal axis.
8. A method of filtering a waste liquid comprising a suspension of waste particles using the apparatus of claim 1 , the method comprising introducing the waste liquid into the internal volume of the housing through at least one of the one or more liquid inlet ports, wherein a liquid flow pattern is established that carries the waste liquid in an upward direction through the filter medium support membrane and out of the internal volume of the housing through at least one of the one or more liquid outlet ports; and further wherein a first portion of the waste particles is carried with the waste liquid into the filter medium support membrane, where they are filtered out of the waste liquid, and a second portion of the waste particles, having a higher average particle mass than the first portion of waste particles, falls to the bottom of the housing, under gravity, without being carried into the filter medium support.
9. A method of filtering a waste liquid comprising a suspension of waste particles using the apparatus of claim 2 , the method comprising:
(i) introducing the waste liquid into the internal volume of the housing through at least one of the one or more liquid inlet ports, wherein a liquid flow pattern is established that carries the waste liquid in an upward direction through the filter medium support membrane and out of the internal volume of the housing through at least one of the one or more liquid outlet ports; and further wherein a first portion of the waste particles is carried with the waste liquid into the filter medium support membrane, where they are filtered out of the waste liquid, and a second portion of the waste particles, having a higher average particle mass than the first portion of waste particles, falls to the bottom of the housing, under gravity, without being carried into the filter medium support membrane;
(ii) discontinuing the introduction of the waste liquid into the internal volume of the housing;
(iii) draining the waste liquid remaining in the housing through the drain port;
(iv) introducing air into the internal volume of the housing through the air vent; and
(v) introducing a rinsing liquid into the shower wand, whereby the rinsing liquid sprays out the plurality of spray ports, and rotating the shower wand around it longitudinal axis such that the rinsing liquid sprays the lower surface of the filter medium support membrane to release particulate filter medium from the filter medium support membrane.
10. A method of filtering a waste liquid comprising a suspension of waste particles using the apparatus of claim 4 , the method comprising:
(i) introducing the waste liquid into the internal volume of the housing through a liquid inlet port while the movable inlet extension tube is in the first position, wherein a liquid flow pattern is established that carries the waste liquid in an upward direction through the filter medium support membrane and out of the internal volume of the housing through at least one of the one or more liquid outlet ports; and further wherein a first portion of the waste particles is carried with the waste liquid into the filter medium support membrane, where they are filtered out of the waste liquid, and a second portion of the waste particles, having a higher average particle mass than the first portion of waste particles, falls to the bottom of the housing, under gravity, without being carried into the filter medium support membrane;
(ii) discontinuing the introduction of the waste liquid into the internal volume of the housing;
(iii) draining the waste liquid remaining in the housing through the drain port;
(iv) introducing air into the internal volume of the housing through the air vent;
(v) rinsing the filter medium support membrane with a rinsing liquid to release particulate filter medium from the filter medium support membrane;
(vi) moving the movable inlet extension tube into the second position; and
(vii) introducing a liquid suspension of particulate filter medium into the internal volume of the housing through the movable inlet extension tube, wherein the liquid suspension flows upward through the support membrane such that the suspended particulate filter medium is loaded onto the support membrane.
11. A method of filtering a waste liquid comprising a suspension of waste particles using the apparatus of claim 7 , the method comprising:
(i) introducing the waste liquid into the internal volume of the housing through a liquid inlet port while the movable inlet extension tube is in the first position, wherein a liquid flow pattern is established that carries the waste liquid in an upward direction through the filter medium support membrane and out of the internal volume of the housing through at least one of the one or more liquid outlet ports; and further wherein a first portion of the waste particles is carried with the waste liquid into the filter medium support membrane, where they are filtered out of the waste liquid, and a second portion of the waste particles, having a higher average particle mass than the first portion of waste particles, falls to the bottom of the housing, under gravity, without being carried into the filter medium support membrane;
(ii) discontinuing the introduction of the waste liquid into the internal volume of the housing;
(iii) draining the waste liquid remaining in the housing through the drain port;
(iv) introducing air into the internal volume of the housing through the air vent;
(v) introducing a rinsing liquid into the shower wand, whereby the rinsing liquid sprays out the plurality of spray ports, and rotating the shower wand around it longitudinal axis such that the rinsing liquid sprays the lower surface of the filter medium support membrane to release particulate filter medium from the filter medium support membrane;
(vi) discontinuing the introduction of the rinsing liquid into the shower wand;
(vii) moving the movable inlet extension tube into the second position; and
(viii) introducing a liquid suspension of particulate filter medium into the internal volume of the housing through the movable inlet extension tube, wherein the liquid suspension flows upward through the support membrane such that the suspended particulate filter medium is loaded onto the support membrane.
12. The method of claim 11 , further comprising:
(ix) discontinuing the introduction of the liquid suspension of particulate filter medium; and
(x) moving the inlet extension tube back into the first position.
13. A method of filtering a waste liquid comprising a suspension of waste particles using a filter apparatus comprising:
(a) a housing defining an internal volume;
(b) one or more liquid inlet ports defined by apertures in a wall of the housing;
(c) one or more liquid outlet ports defined by apertures in a wall of the housing, the one or more liquid outlet ports disposed above the one or more liquid inlet ports; and
(d) a filter medium support membrane housed within the housing and disposed between at least one of the one or more liquid inlet ports and at least one of the one or more liquid outlet ports;
the method comprising:
introducing the waste liquid into the internal volume of the housing through at least one of the one or more liquid inlet ports, wherein a liquid flow pattern is established that carries the waste liquid in an upward direction through the filter medium support membrane and out of the internal volume of the housing through at least one of the one or more liquid outlet ports; and further wherein a first portion of the waste particles is carried with the waste liquid into the filter medium support membrane, where they are filtered out of the waste liquid, and a second portion of the waste particles, having a higher average particle mass than the first portion of waste particles, falls to the bottom of the housing, under gravity, without being carried into the filter medium support membrane;
(ii) discontinuing the introduction of the waste liquid into the internal volume of the housing;
(iii) draining the waste liquid remaining in the housing;
(iv) rinsing the filter medium support membrane with a rinsing liquid to release particulate filter medium from the filter medium support membrane; and
(v) introducing a liquid suspension of particulate filter medium into the internal volume of the housing through one of the one or more liquid inlet ports, wherein the liquid suspension flows upward through the support membrane such that the suspended particulate filter medium is loaded onto the filter medium support membrane.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/402,034 US20120211443A1 (en) | 2011-02-22 | 2012-02-22 | Zero-backwash liquid filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201161463693P | 2011-02-22 | 2011-02-22 | |
US13/402,034 US20120211443A1 (en) | 2011-02-22 | 2012-02-22 | Zero-backwash liquid filter |
Publications (1)
Publication Number | Publication Date |
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US20120211443A1 true US20120211443A1 (en) | 2012-08-23 |
Family
ID=46651888
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/402,034 Abandoned US20120211443A1 (en) | 2011-02-22 | 2012-02-22 | Zero-backwash liquid filter |
US13/985,899 Expired - Fee Related US9095794B2 (en) | 2011-02-22 | 2012-02-22 | Zero-backwash liquid filter |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US13/985,899 Expired - Fee Related US9095794B2 (en) | 2011-02-22 | 2012-02-22 | Zero-backwash liquid filter |
Country Status (2)
Country | Link |
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US (2) | US20120211443A1 (en) |
WO (1) | WO2012116039A2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5750041A (en) * | 1994-08-15 | 1998-05-12 | Hirane; Ken | Method for backwashing water processing systems |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3713538A (en) | 1970-11-30 | 1973-01-30 | C Kass | Cycle valve for filters |
US3957636A (en) * | 1974-03-06 | 1976-05-18 | Kostas Savas Arvanitakis | Method and apparatus for liquid/solid separation |
US4309292A (en) * | 1978-12-07 | 1982-01-05 | The Dehydro Corporation | Filtering methods |
JPH0217908A (en) * | 1988-07-05 | 1990-01-22 | Nishihara Environ Sanit Res Corp | Method for washing solid-liquid separation apparatus |
US5462654A (en) | 1993-09-29 | 1995-10-31 | Hering, Jr.; C. J. | Dynamic moving bed filter apparatus |
CA2355753A1 (en) | 2000-08-29 | 2002-02-28 | Aleksandr Dmitrievich Remizov | Apparatus for the purification of liquids |
JP4181440B2 (en) | 2003-01-16 | 2008-11-12 | 山田 哲三 | Filtration apparatus and filtration method using the same |
US7270745B2 (en) * | 2003-08-04 | 2007-09-18 | Schwartzkopf Steven H | Liquid filtration apparatus embodying super-buoyant filtration particles |
US7520987B1 (en) | 2005-11-15 | 2009-04-21 | Wrt International Llc | System and apparatus for purging absorptive materials used in the removal of contaminates from an aqueous medium |
US20070289917A1 (en) | 2006-06-15 | 2007-12-20 | Mylin John M | Separation system and method of operating |
KR101625237B1 (en) * | 2007-12-21 | 2016-05-27 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Liquid filtration systems |
-
2012
- 2012-02-22 US US13/402,034 patent/US20120211443A1/en not_active Abandoned
- 2012-02-22 US US13/985,899 patent/US9095794B2/en not_active Expired - Fee Related
- 2012-02-22 WO PCT/US2012/026069 patent/WO2012116039A2/en active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5750041A (en) * | 1994-08-15 | 1998-05-12 | Hirane; Ken | Method for backwashing water processing systems |
Also Published As
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US9095794B2 (en) | 2015-08-04 |
WO2012116039A3 (en) | 2013-01-31 |
US20140131294A1 (en) | 2014-05-15 |
WO2012116039A2 (en) | 2012-08-30 |
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