US20040134842A1 - Tertiary filter - Google Patents

Tertiary filter Download PDF

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Publication number
US20040134842A1
US20040134842A1 US10/338,704 US33870403A US2004134842A1 US 20040134842 A1 US20040134842 A1 US 20040134842A1 US 33870403 A US33870403 A US 33870403A US 2004134842 A1 US2004134842 A1 US 2004134842A1
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Prior art keywords
filter
liquid
wash
chamber
vacuum
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Abandoned
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US10/338,704
Inventor
Donald Ricketts
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Grouse Mountain Inc
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Wastewater Technology Inc
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Publication date
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Priority to US10/338,704 priority Critical patent/US20040134842A1/en
Assigned to WASTEWATER TECHNOLOGY, INC. reassignment WASTEWATER TECHNOLOGY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RICKETTS, DONALD D.
Publication of US20040134842A1 publication Critical patent/US20040134842A1/en
Priority claimed from US11/066,274 external-priority patent/US7678284B2/en
Assigned to GROUSE MOUNTAIN, INC. reassignment GROUSE MOUNTAIN, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WASTEWATER TECHNOLOGY, INC.
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor
    • B01D29/01Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with flat filtering elements
    • B01D29/05Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with flat filtering elements supported
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor
    • B01D29/11Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13Supported filter elements
    • B01D29/23Supported filter elements arranged for outward flow filtration
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor
    • B01D29/50Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D29/00Other filters with filtering elements stationary during filtration, e.g. pressure or suction filters, or filtering elements therefor
    • B01D29/62Regenerating the filter material in the filter
    • B01D29/64Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B01D29/6446Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles with a rotary movement with respect to the filtering element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2201/00Details relating to filtering apparatus
    • B01D2201/08Regeneration of the filter
    • B01D2201/081Regeneration of the filter using nozzles or suction devices
    • B01D2201/082Suction devices placed on the cake side of the filtering element

Abstract

An apparatus for filtering suspended solids from a liquid having a group of filters mounted inside a filter chamber. The filters divide the chamber into dirty liquid chambers and clean liquid chambers. A wash assembly is disposed within the chamber having vacuum/pump heads in contact with the filters rotates within the chamber. The vacuum/pump heads are connected to a pump and vacuum source located either within or without the apparatus. The vacuum/pump heads either vacuum material up or spray material therefrom in order to clean the filters. As the wash assembly rotates, the vacuum heads are able to contact and clean the entire surface of the filters.

Description

  • This invention relates to an apparatus for filtration of material, such as suspended solids, from a liquid effluent. [0001]
  • BACKGROUND OF THE INVENTION
  • Various filtration apparatus is known in the art. For example, U.S. Pat. Nos. 4,090,965 and 4,639,315, both to Fuchs disclose apparatus whereby a cloth is mounted on a rotatable drum filter on a filter frame. The filter frame defines a boundary between influent and effluent compartments. During filtering, liquid influent containing suspended solids is passed into the influent compartment and flows in a filter direction through the filter into the filter effluent compartment for discharge to an outlet. Intermittent backwashing of the filter material is effected by moving the filter material past a suction head positioned to engage an outer side of the filter material and which is operative to draw filtered liquid from the filter effluent compartment through the filter material in a direction opposite the filter direction, to remove and discharge the entrapped solids with the backwash water. In general, a backwash step is initiated either by a timer at periodic intervals or by sensing a preselected rise in liquid level in the tank as an indication that the filter web is becoming clogged. [0002]
  • Other filter apparatus, such as U.S. Pat. No. 5,876,612 to Astrom, disclose a filter apparatus whereby a vertical disc shaped filter frame is used rather than a drum shape. A filter makes up the outer surface of the disk so that the influent is forced into the inner region through the filter into a effluent region. A backwash suction assembly is located in contact with the filter frame to remove material that may clog the filter. The filter frame is rotated in order to clean the entire filter surface. [0003]
  • When the filter becomes clogged, requires extensive cleaning or simply requires replacement in any of the forgoing apparatus of the prior art, an operator must remove outer panels on the apparatus and access the filter frame. The filter frame must then be rotated to a certain position so the operator can avoid the backwash and other assemblies in order to gain access to the filter/cloths. Such processes makes such a filter exchange difficult and time consuming to change filters/cloths. [0004]
  • Further, the filter, frame and any filter cloths make the filter frame assembly bulky and heavy. Rotation of such assembly requires large amounts of energy when such assembly is used in operation and requires special handling when the filters need to be replaced. The assembly becomes even bulkier when the filter is substantially clogged with filtered material requiring even more rotational energy. [0005]
  • SUMMARY OF THE INVENTION
  • The object of this invention is to address the above-mentioned problems with conventional filter apparatus and to provide a new filter apparatus that requires less energy to operate, is easier to maintain, and allows for efficient replacement of filters. [0006]
  • These and other objects are overcome in a filter apparatus comprising a chamber having an influent pipe for receiving dirty liquid and an effluent pipe for discharging clean liquid, a group of non-rotating filters mounted inside the chamber wherein dirty liquid passes through the filters to create clean liquid, a wash apparatus in contact with the filters disposed within the chamber rotatable about an axis and having a plurality of ports and a motor, gear and chain assembly for rotating said wash apparatus. When the motor rotates the wash apparatus, a cleaning head is able to clean the entire surface of the filter by suctioning filtered material from or washing filtered material off the filters through ports which are located on cleaning heads. The filters are preferably a polypropylene felt having a 10 micron mesh and are mounted preferably on a polypropylene grid backing plate. [0007]
  • The chamber is divided up into dirty liquid chambers and clean liquid chambers. The filters provide the divisions between them. In a preferred embodiment, the chamber has a single dirty liquid chamber, a pair of filters and a pair of clean liquid chambers. A transfer pipe between the clean liquid chambers maintains a flow between them. One clean water chamber is connected to the effluent pipe as an output for the clean water from the apparatus. In another embodiment a plurality of dirty water chambers and clean water chambers may be provided. In yet another embodiment, several filter apparatuses may be provided. Such apparatus can have a modular design to be placed together to filter out materials from a single input influent liquid. [0008]
  • The wash assembly preferably comprises cleaning heads connected to respective manifolds, which are mounted onto a hollow axle. Vacuuming and suctioning forces provided from outside the filter apparatus are transferred into the apparatus via the hollow axle, through the manifolds and into the cleaning heads. The vacuuming and suctioning forces are generated by a pump and suction reversible motor. [0009]
  • In yet another embodiment, a control is connected with the rotational motor and the vacuum/pump motor which provides suctioning and pumping forces. The control via a timer or a predetermined program determines when to run a cleaning cycle to remove build-up from the filter. A float may also be provided inside the dirty liquid chamber to indicate when the filter is running slow and control the operation of the filter. At such a time, a signal may be sent to the control to begin a cleaning cycle.[0010]
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will now be explained and objects other than those set forth above, will become apparent when consideration is given to the following detailed description which makes reference to the annexed drawings wherein: [0011]
  • FIG. 1 illustrates a first side view of a filter apparatus according to a first embodiment of the invention; [0012]
  • FIG. 2 illustrates a front view of the filter apparatus shown in FIG. 1; [0013]
  • FIG. 3 illustrates a second side view of the filter apparatus shown in FIG. 1; [0014]
  • FIG. 4 illustrates of top sectional view of the filter apparatus shown in FIG. 1 showing the major components thereof; [0015]
  • FIG. 5 illustrates a sectional view along line A-A in FIG. 4; [0016]
  • FIG. 6 illustrates a sectional view along line B-B in FIG. 4; [0017]
  • FIG. 7 illustrates a sectional view along line C-C in FIG. 4; [0018]
  • FIG. 8 illustrates a sectional view along line D-D in FIG. 4; [0019]
  • FIG. 9 illustrates a sectional view along line E-E in FIG. 4; [0020]
  • FIGS. 10 and 10A-[0021] 10D illustrate the backwash suction apparatus of the filter apparatus shown in FIG. 1;
  • FIGS. 11A and 11B illustrate the filter screen of the filter apparatus shown in FIG. 1; [0022]
  • FIG. 12 illustrates a top sectional view of a filter apparatus according to another embodiment of the invention; and [0023]
  • FIG. 13 illustrates a side view of the filter apparatus shown in FIG. 12.[0024]
  • DETAILED DESCRIPTION OF THE INVENTION
  • A detailed view of a first embodiment of the invention is disclosed in FIGS. [0025] 1-11. The filter apparatus is a filtration device for removing particles from a liquid. The apparatus may be used as a tertiary filtration system for filtering out such particles following treatment from an industrial or municipal wastewater treatment plant. The device may also be used as a primary filtration system in other capacities.
  • FIGS. [0026] 1-4 show the general features of a filter apparatus 100, which is generally of a box shape comprising several inner compartments. The liquid to be filtered enters an upper portion of apparatus 100 via an influent pipe 1. Inside the apparatus the liquid is filtered to remove solids from the liquid. The cleaned liquid then passes through a discharge box 7 and is discharged through a discharge pipe 8.
  • As shown in FIG. 4, apparatus [0027] 100 is divided into three compartments, a dirty liquid chamber 2 and two clean liquid chambers 4 and 6. A transfer pipe 5 interconnects the bottom each of the clean water chambers 4 and 5 and to allow free flow of liquid between them. Filter assemblies 3A and 3B are mounted inside the apparatus and provide a division between dirty liquid chamber 2 and clean liquid chambers 4 and 6. Dirty liquid entering through pipe I fills dirty liquid chamber 2. The water then passes through filter assemblies 3A and 3B which removes solids from the liquid to clean the liquid. The clean liquid then moves into clean water chambers 4 and 6. Clean liquid in clean water chamber 4 moves through transfer pipe 5 to clean water chamber 6. The clean water then exits the apparatus through discharge box 7 and discharge pipe 8.
  • As shown in FIGS. 5, 6 and [0028] 7, each filter assemblies 3A and 3B is a divider between dirty liquid chamber 2 and clean liquid chambers 4 and 6. Filter assemblies 3A and 3B comprises four grid backing plates 40 generally arranged in a circular configuration divided into four quadrants. Each backing plate 40 is removable separately from the filter apparatus to allow changing of the plates. Backing plates 40 are preferably made of a polypropylene.
  • On the inside of each grid backing plate [0029] 40 is a filter 41 (FIGS. 6 and 7). The filter, in conjunction with backing plate 40 removes solids from the liquid passing from dirty liquid chamber 2 to clean liquid chambers 4 and 6. Filter 41 is preferably a cloth media that is stretched over the surface of grid backing plate 40. It may be made of a cloth polypropylene felt. It preferably comprises apertures of about 10 microns width. However, any filter media capable of filtering out a desired solid may be used.
  • The structure of each removable grid backing plate [0030] 40 having an associated filter 41 mounted thereon is shown in FIGS. 11A and 11B. Each grid backing plate basically is a quarter circle shape having filter 41 applied to a surface thereof. The combination removes desired solids from the dirty liquid.
  • After extended use of the apparatus, the solids filtered out of the dirty liquid by filters [0031] 41 begin to accumulate, causing the filter to become clogged. To remove excessive solids, the apparatus is provided with a wash assembly 110. Wash assembly 110 comprises a pair of wash arms 10A and 10B mounted on a hollow axle 11. The wash arms 10A and 10B are placed into contact or near contact with filter assembly 3 and are used to wash filters 41 of such accumulated solids by either vacuuming and/or rinsing. In order for the wash arms 10A and 10B to clean the entire surface of filters 41, the wash arms rotate about hollow axle 11 (shown in FIGS. 6 and 7). As such, wash arm 10A and 10B are mounted on hollow axle 11 and are in fluid connection allowing for vacuum and rinsing forces to pass from hollow axle 11 to wash assembly 100.
  • Hollow axle [0032] 11 rotates about its axis via a pair of bearings 30 attached at either side of filter apparatus 100, and may rotate either in a clockwise rotation or in a counter clockwise rotation. A wash motor 13 mounted on an upper surface of filter apparatus 100 provides the driving power to rotate hollow axle 11 via a disk gear 12 provided on the hollow axle. The rotation may be at one revolution per minute at intervals, and need not be continuous. The rotation may be at any speed and interval necessary to adequately clean filters 41. A chain or belt extends between a disk gear on wash motor 13 and disk gear 12 to transfer rotation of motor 13 to axle 11 and hence wash assembly 110.
  • Connected to a distal end of hollow axle [0033] 11 from outside the filter apparatus is a vacuum and hydraulic pump assembly (shown in FIGS. 4 and 9), comprising a wash pump 15, a wash discharge pipe 16, a connecting pipe 60 and a wash axle seat 14. Such components are electrically connected with wash motor 13 to operate simultaneously. Wash pump 15 provides either a pumping force or provides a suction force. Such forces are transferred to wash assembly 110 via connecting pipe 60 and hollow axle 11. All such components are in fluid contact and provide a conduit for suctioning and pumping forces. Wash axle seal 14 provides a seal between connecting pipe 60 and hollow axle 11 to allow for rotation of the hollow axle with respect to the connecting pipe without losing any vacuum or pumping pressure of the pump assembly. Fluid that is being pumped into the filter apparatus and solids that are vacuumed off the filter in the apparatus retrieved by the pumping assembly are either received or discharged through wash discharge pipe 16.
  • The structure and design of wash assembly are shown in FIGS. 10 and 10A-D. Wash arm [0034] 10A comprises a hollow rectangular box shaped vacuum head 220 which is provided with a series of connection holes 401, 402, 403 along a side thereof and a series of vacuum/wash holes 270, 271, 272 along another side thereof. The vacuum/wash holes may be a series of round holes or long slits along the side thereof or may be a single slit along the entire surface. Such design will depend on the particular solids to be removed. Vacuum head 220 has a pair of dividers 212 and 213 which divide the inner region of the vacuum head into three vacuum compartments 300, 301 and 302, each of different length. Each connection hole 401, 402 or 403 provides an inlet to each respective vacuum compartment 300, 301 or 302. A suction or wash force supplied to connection holes 401, 401 and 403 will be transferred to vacuum/wash holes 270, 271, or 272, respectively.
  • Vacuum head [0035] 220 is attached a wash frame 204, which is attached to a wash bracket 214. Wash bracket attaches directly to hollow axle 11 in wash assembly 10. Wash frame 204 extends radially from hollow axle 11 allowing vacuum head 220 to make a radial sweep as wash assembly 110 rotates. The vacuum head 220 is held in contact to filters 41 by a spring or other means (not shown).
  • Additionally attached to wash bracket [0036] 214 is a wash manifold 200, which is a hollow cylinder extending radially away from hollow axle 11. The connection between wash bracket 214 and wash manifold 200 is a fluid connection, whereby a hole 215 connects the inner chamber of the wash manifold through the wash bracket. Hollow axle 11 also has a hole at the location where wash bracket 214 attaches to it. When the wash bracket is connected to hollow axle 11 as shown in FIGS. 4, 6 and 7, the inner chamber of hollow axle 11 is in communication with the inner chamber of wash manifold 200.
  • Wash manifold [0037] 200 additionally has three consecutive manifold connection holes 221, 222 and 223 along its length. Connection tubes 224, 225 and 226 connect between the manifold connection holes 221, 222 and 223 and the vacuum head connection holes 401, 402 and 403. Such system intercommunicates the inner chamber of wash manifold 200 to the three chambers of the vacuum head 220.
  • Because of the rotation of vacuum head [0038] 220 about the axis of hollow axle 11, vacuum/wash hole 272 which is nearer the rotational axis will cover less surface across filter 41 than vacuum/wash hole 270 since vacuum/wash hole 270 is farther from the rotational axis. This implies that the farther from the center of rotation, the amount of solids and dirty liquid removed at a particular radius will increase. For example, if a similar suction is provided across the entire vacuum head 220, vacuum/wash hole 270 would vacuum up more material than vacuum/wash hole 272. Such an arrangement means that substantially more solids and dirty liquid enter wash manifold 200 from connection tube 226 than tube 224.
  • To provide a more efficient operation of the filter, it is advantageous to provide a more uniform rate of removal of solids and dirty liquid across filter [0039] 41. There are various methods to achieve a uniform rate. A first method is to alter the diameter of manifold connection holes 221. 222 and 223. Such can be done by placing a reducer or washer in the connection hole, making the piping different sizes at the connections, or any other means by which the amount of fluid passing through the connection hole can be restricted. Making manifold connection hole 221 smaller in diameter will restrict the amount of solids and dirty liquid that can be removed through vacuum/wash hole 272. Altering the diameters of manifold connection holes 222 and 223 provides similar results to vacuum/wash holes 271 and 270, respectively. Making the diameter of manifold connection hole 221 smaller in diameter than the diameter of manifold connection hole 222, which is in turn made smaller than the diameter of manifold connection hole 223 will provide a smaller amount of solids/dirty liquid removal in the areas nearer the rotational axis, namely at vacuum wash hole 272 and a greater amount of removal at vacuum wash hole 270, which will provide a more uniform removal across vacuum head 200.
  • Another method to achieve a more uniform removal rate across vacuum head [0040] 220 is to alter the relative sizes of the vacuum/wash holes 270,271,272. For example, making vacuum/wash hole 272, the nearest to the rotational axis, smaller than vacuum/wash hole 271, which in turn is made smaller than vacuum/wash hole 272 would also restrict the amount of solids and dirty water taken in by the vacuum/wash holes nearer the rotational axis and allow more solids and dirty water to be taken in by the holes farther away from the rotational axis.
  • While a group of three divisions of vacuum head [0041] 220, namely vacuum compartments 300, 301 and 302, such is used by way of example, more or fewer divisions may be used to provide a uniform rate of removal of solids.
  • While the embodiment shown in FIG. 4 includes only one vacuum head, such design is by way of example. More than one vacuum head may be used, such at that shown in FIG. 10D whereby two vacuum arms are attached to one another. Other embodiments are additionally possible. [0042]
  • Filter apparatus [0043] 100 is further provided with a control 20 (shown in FIGS. 5 and 6) for controlling the operations of the wash assembly 1 10 and the hydraulic pump assembly. Connected to control 20 is a float level switch 19 provided in dirty liquid chamber 2 and is to provide information regarding the level of the dirty water. By information received from float level switch, control 20 begins or ends operation of the wash assembly or the hydraulic pump assembly. For example, when the dirty water level in dirty liquid chamber 2 rises sufficiently during a filtering operation of the filter apparatus, which would generally indicate that the filter has a substantial build-up of solids, control 20 would activate either a vacuum operation or a wash operation. A vacuum operation would activate the wash pump 15 to perform a vacuum operation and simultaneously activate wash motor 13 to begin rotation of the wash assembly. On the other hand, a wash operation would activate wash pump 15 to perform a pumping operation and also simultaneously activate wash motor 13. While use of control 20 is preferred, such activations may be done manually or with the aid of a timer.
  • Referring back to FIGS. 1, 3, and [0044] 6, dirty liquid chamber 2 is also provided with an overflow pipe 9. Should the filters become clogged with enough solids to prevent adequate liquid flow or should the power in the backwash suction system fail, the level of the dirty liquid would continue to rise until it reaches overflow pipe 9. The excess dirty liquid would then flow out of the filter apparatus through overflow pipe 9 to a designated location. Such prevents the filter apparatus from over filling or from causing influent pipe 1 to back up.
  • To clean or drain the filter apparatus, a group of pipes are provided. A pair of clean liquid drain pipes [0045] 18 are provided at the lower portions of the clean liquid chambers 4 and 6. Such pipe allows for draining such chambers. Additionally, a sludge discharge pipe 17 is provided at a lower portion of dirty liquid chamber 2 to drain remaining dirty water as well as provide access to the chamber to remove sludge that has accumulated in its bottom.
  • The operation of the filter apparatus will now be described. Dirty liquid enters apparatus [0046] 100 via influent pipe 1 and is dumped into dirty water chamber 2 as shown in FIGS. 4 and 6. The dirty liquid passes through filter assembly 3A and 3B whereby solids and other materials are removed from the liquid. Clean liquid passes completely through into clean liquid chambers 4 and 6. Liquid in clean liquid chamber 4 passes into clean liquid chamber 6 via a transfer pipe 5. Once a certain level of clean liquid is achieved in clean liquid chamber 6 as shown in FIG. 8, the clean liquid passes out the effluent pipe 8.
  • During operation of the filter apparatus, solids and other materials will begin to accumulate on the filter assemblies [0047] 3A and 3B, particularly on filters 41. When enough of the solids accumulate, the dirty liquid will move slower through filter assemblies than it is entering, and hence the dirty liquid will begin to over-fill dirty liquid chamber 2. When the level reaches float level switch 9, control 20 will be notified a cleaning operation is required. At such time, control 20 will activate a vacuum cycle whereby the wash pump is activated to provide a suction. The suction passes from wash pump 15, through connecting pipe 60, into hollow axle 11, into wash bracket 214, into wash manifold 200, into connection tubes 224, 225 and 226, into vacuum compartments 300, 301 and 302, through and vacuum/wash holes 270, 271, 272 to vacuum solids and other materials from the surface of filters 41. When such solids and materials are removed, they pass through the system and is pumped out through the wash discharge pipe 16. Control 20 may also activate a rinsing cycle whereby wash pump is activated to provide a pumping action. Water, cleaning fluid or other chemical cleaning agents may be pulled into wash pump 15 and pumped out through connecting pipe 60, into hollow axle 11, into wash bracket 214, into wash manifold 200, into connection tubes 224, 225 and 226, into vacuum compartments 300, 301 and 302, through and vacuum/wash holes 270, 271, 272 to blast such liquid onto the surface of filters 41. Such has the effect of dislodging any solids or other material that may be difficult to remove with a suction cycle. Control 20 may repeat a suction cycle and/or a rinsing cycle repetitively or in combinations to effectively remove all debris from filters 41. Control 20 may also be notified that a cleaning cycle is required with the use of a timer, which can be set to notify at various intervals and durations, depending on a predetermined amount of solids in the wastewater.
  • Simultaneously during each of the suction cycle and the rinsing cycle, control [0048] 20 activates wash motor 13 to rotate wash assembly 110. The wash assembly must be rotated in order for the vacuum heads 200 to effectively clean the entire surface of filters 41. As described above, vacuum head 220 extends radially from the axis of hollow axle 11. As the wash motor rotates wash assembly, vacuum head 220 is able to contact or vacuum/rinse the entire surface area of filters 41. The wash motor is arranged such that the vacuum head can travel clockwise and/or counter clockwise over the filter 41.
  • Changing of the filter [0049] 41 and/or the grid backing plates 40 requires a few simple steps. When a change process is required, the operator must first drain the dirty liquid chamber 2 and the clean liquid chambers 4 and 6. Such can be done through sludge discharge pipe 17 and clean liquid drain pipes 18. The pipes are essentially opened to allow the liquid in filter apparatus to drain out of the chambers. Sludge discharge pipe 17 has a larger diameter to allow for sludge accumulated in dirty liquid chamber to either drain out or be removed manually by an operator. Once the chambers have been emptied, the operator may remove panels 300 and 301 on the filter apparatus (FIG. 4) to gain access to grid backing plates 40 through dirty liquid chamber 2, on which filters 41 are attached, which can be removed regardless of the position of wash assembly 110. The operator only need reach through the dirty liquid chamber 2 to change the filters in the filter apparatus. No cumbersome or complicated apparatus for rotating the filter assembly as in the prior art is present or need to be disassembled to enable removal of filter 41.
  • A second embodiment of the invention is shown in FIGS. 12 and 13. The invention has generally similar operation and components, but has a second filter and wash assembly incorporated therein. In its operation, dirty liquid enters the filter apparatus [0050] 600 through influent pipe 601, which is separated and flows into dirty liquid chambers 602A and 602B. Filter assemblies 603A, 603B, 603C and 603D each filter out solids and materials. The clean water flows into clean liquid chambers 604, 604A and 606. The three chambers are connected via a transfer pipe assembly 605, whereby clean liquid flows in order to maintain an equilibrium between them. The clean water then rises and flows out of the filter apparatus through a effluent pipe 608.
  • Wash assembly [0051] 710 has a similar appearance and function as disclosed in the previous embodiment, but uses a single wash motor 613 to rotate four wash arms 610A-D about hollow axle 611. Each wash arm 610A-D cleans a respective filter assembly 603A-D. The respective design of each wash arm 610A-D is similar as wash arms 10A and 10B of the previous embodiment. Furthermore, the design of the vacuum and hydraulic pump assembly 650 is similar to the pump assembly shown and described in the previous embodiment.
  • Dirty liquid chambers [0052] 602A and 602B are also provided with overflow pipes 609. Should the filters become clogged with enough solids to prevent adequate liquid flow or should the power in the backwash suction system fail, the level of the dirty liquid would continue to rise in each respective chamber until it reaches overflow pipes 609. The excess dirty liquid would then flow out of the filter apparatus through overflow pipes 609 to a designated location. Such prevents the filter apparatus from over filling or from causing influent pipe 601 to back up.
  • To clean or drain the filter apparatus according to this embodiment, a group of pipes are provided. A trio of clean liquid drain pipes [0053] 618 are provided at the lower portions of the clean liquid chambers 604, 604A and 606. Such pipe allows for draining such chambers. Additionally, sludge discharge pipes 617 are provided at a lower portion of dirty liquid chambers 602A and 602B to drain remaining dirty water as well as provide access to the chamber to remove sludge that has accumulated in its bottom.
  • Cleaning of the apparatus of this embodiment would occur in a generally similar manner as that disclosed in the previous embodiment with regard to filter assemblies [0054] 603A-D. When a change process is required, the operator must first drain the dirty liquid chambers 602A and 602B and the clean liquid chambers 604, 604A and 606. Such can be done through sludge discharge pipes 617 and clean liquid drain pipes 618. The pipes are essentially opened to allow the liquid in the filter apparatus to drain out of the chambers. Sludge discharge pipes 617 have a larger diameter to allow for sludge accumulated in dirty liquid chamber to either drain out or be removed manually by an operator. Once the chambers have been emptied, the operator may remove panels 800 and 801 on the filter apparatus (FIG. 4) to gain access to grid backing plates 40 of the filter assemblies 603A and 603C through dirty liquid chambers 602A and 602B, on which filters 41 are attached. The operator only needs to reach through the dirty liquid chambers 602A and 602B to change the filters in the filter apparatus.
  • While the above embodiment discloses a single apparatus having a single body shell having a pair of dirty water chambers and four filter assemblies, the design of the first embodiment may be altered to create a modular design, whereby a group of such filter apparatuses may be aligned side by side. Such would merely require splitting the influent liquid coming in at the influent pipe and sending it into the influent pipe for each filter apparatus. Such can be accomplished by splitting the main pipe into a plurality of branches. Additionally, the clean liquid would have to be collected from each effluent pipe for each filter apparatus. Such can be accomplished with the use of a pipe joint whereby several pipes spill into a single pipe. A further modification would be to mechanically link the hollow axles of each adjacent modular filter apparatus. Such linking of the hollow axles can be accomplished in any manner known to those having ordinary skill in the art. In this manner, the entire row of filter apparatuses could operate under a single wash motor. [0055]
  • An additional embodiment may be to use a single filter assembly in the filter apparatus described in the first embodiment. Such would have the effect of reducing the components required for the filter apparatus. [0056]
  • Although the present invention has been described and illustrated in detail, such explanation is to be clearly understood that the same is by way of illustration and example only, and is not to be taken by way of limitation. The particular order of the method steps is not necessarily vital; rather, the inventive steps may be done in numerous orders without depart from the invention herein described. The spirit and scope of the present invention are to be limited only by the terms of claims recited hereinafter. [0057]

Claims (29)

We claim:
1. A filter apparatus for removing material from a liquid comprising:
a chamber having an influent pipe for receiving influent liquid and an effluent pipe for discharging effluent liquid;
at least one filter mounted inside said chamber wherein said influent liquid passes through said at least one filter to create said effluent liquid;
a wash apparatus disposed within said chamber rotatable about an axis and having a plurality of ports; and
a motor for rotating said wash apparatus,
wherein upon rotation of said wash apparatus, said ports suction filtered material from or wash filtered material off said filters.
2. The filter apparatus according to claim 1 wherein said filters are mounted on grid backing plates.
3. The filter apparatus according to claim 1 wherein the wash assembly contacts the filter.
4. The filter apparatus according to claim 1 wherein said chamber comprises at least one first chamber which accumulates said influent liquid and at least one second chamber which accumulates said effluent liquid.
5. The filter apparatus according to claim 4 wherein a float assembly is mounted within said first chamber for detecting a predetermined level of said influent liquid.
6. The filter apparatus according to claim 5 further comprising a means for controlling said means for rotating and said wash apparatus.
7. The filter apparatus according to claim 6 wherein said control means activates said means for rotating and said wash apparatus upon said float assembly detecting said influent liquid.
8. The filter apparatus according to claim 1 wherein a timer is connected to said means for rotating and said wash apparatus and activates a cleaning cycle at predetermined intervals.
9. The filter apparatus according to claim 1 wherein said filter is a polypropylene felt.
10. The filter apparatus according to claim 2 wherein said grid backing plates are polypropylene plastic.
11. The filter apparatus according to claim 4 wherein a transfer assembly intercommunicates said second chambers for allowing a transfer of effluent liquid between said second chambers.
12. The filter apparatus according to claim 11 wherein one of said second chambers communicates with said effluent pipe.
13. The filter apparatus according to claim 4 further including an overflow pipe for discharging excess influent liquid in said at least one first chamber.
14. The filter apparatus according to claim 1 wherein said chamber comprises drain pipes for draining said influent and effluent liquids.
15. A filter apparatus for removing material from a liquid comprising:
a chamber having an influent pipe for receiving influent liquid and an effluent pipe for discharging effluent liquid;
at least one filter mounted inside said chamber wherein influent liquid passes through said at least one filter to create said effluent liquid;
a wash apparatus having a plurality of ports disposed within said chamber rotatable about an axis and connected to a pump/vacuum means for suctioning material into or spraying liquid from said ports; and
a means for rotating said wash apparatus,
wherein upon rotation of said wash apparatus, said wash apparatus suctions filtered material from or washes filtered material off said filters through said ports.
16. The filter apparatus according to claim 15 wherein said wash apparatus comprises:
a hollow axle concentric with said axis;
at least one vacuum/pump head mounted on said axle and having said ports; and
at least one manifold mounted on said axle intercommunicating a respective vacuum/pump head and said hollow axle,
wherein said hollow axle intercommunicates each said manifold to said pump/vacuum means.
17. The filter apparatus according to claim 16 wherein said at least one vacuum/pump head contacts said filter.
18. The filter apparatus according to claim 16 wherein said at least one vacuum/pump head has a series of chambers of different sizes each having at least one of said ports.
19. The filter apparatus according to claim 18 wherein a series of connection tubes intercommunicate each said manifold and a respective vacuum/pump chamber.
20. The filter apparatus according to claim 19 wherein each hole for passage of liquid through each connection between a connection tube and said vacuum/pump chamber of is of a different size.
21. The filter apparatus according to claim 15 wherein said pump/vacuum means comprises a reversable motor.
22. The filter apparatus according to claim 15 wherein said liquid is a chemical cleaning agent.
23. The filter apparatus according to claim 16 wherein said chamber comprises at least one first chamber which accumulates said influent liquid and a plurality of second chambers which accumulates said effluent liquid.
24. The filter apparatus according to claim 23 wherein said filters are located between said at least one first chamber and said second chambers.
25. The filter apparatus according to claim 23 wherein each filter is cleaned by at least one vacuum/pump head.
26. A system for removing material from a liquid comprising a plurality of modular filter apparatuses, each filter apparatus comprising:
a chamber having an influent pipe for receiving influent liquid and an effluent pipe for discharging effluent liquid;
at least one filter mounted inside said chamber wherein influent liquid passes through said at least one filter to create said effluent liquid;
a wash apparatus disposed within said chamber and rotatable about said axis, comprising a hollow axle concentric with said axis, at least one vacuum/pump head mounted on said axle and having a plurality of ports, and at least one manifold mounted on said axle intercommunicating a respective vacuum/pump head and a pumping/vacuum source; and
a means for rotating said wash apparatus,
wherein upon rotation of said wash apparatus, said wash apparatus suctions filtered material from or washes filtered material off said filters through said ports.
27. The system according to claim 26 wherein each filter apparatus comprises a means for interconnecting said hollow axle to a hollow axle of another filter apparatus.
28. The system according to claim 26 further comprising a means for dividing said liquid into said influent liquids input into each filter apparatus.
29. The system according to claim 26 further comprising a means for collecting said effluent from each filter apparatus and combining them into an output liquid.
US10/338,704 2003-01-09 2003-01-09 Tertiary filter Abandoned US20040134842A1 (en)

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CH00036/04A CH697573B1 (en) 2003-01-09 2004-01-09 Filtering device with rotating washing arrangement.
US10/839,166 US7537689B2 (en) 2003-01-09 2004-05-06 Tertiary filter
US11/066,274 US7678284B2 (en) 2003-01-09 2005-02-28 Tertiary filter
US12/692,410 US7820062B2 (en) 2003-01-09 2010-01-22 Tertiary filter
US12/909,664 US20110031177A1 (en) 2003-01-09 2010-10-21 Tertiary filter

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070045200A1 (en) * 2005-08-30 2007-03-01 Moon Won J Gathering method and apparatus of powder separated soluble component
WO2016074145A1 (en) * 2014-11-11 2016-05-19 崔楠 Filter gas backwash device

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7807050B2 (en) * 2002-12-26 2010-10-05 Aqua-Aerobic Systems, Inc. Backwash assembly and method having a rotating backwash arm for cleaning cloth filter media
US7833424B1 (en) 2002-12-26 2010-11-16 Aqua-Aerobic Systems, Inc. Backwash assembly and method having a rotating backwash arm for cleaning cloth filter media
US7678284B2 (en) * 2003-01-09 2010-03-16 Grouse Mountain, Inc. Tertiary filter
US8048296B2 (en) * 2006-10-20 2011-11-01 Jay Stevens Filtering device for liquid filtration
US8070963B2 (en) * 2007-07-09 2011-12-06 Odis Irrigation Equipment Ltd. Method and system for backwashing a filter
US8118948B1 (en) * 2009-02-26 2012-02-21 Ernest Szabo Vehicle mounted garbage can cleaner and method
US8647516B2 (en) * 2010-09-03 2014-02-11 Johnny Leon LOVE Filtration method with self-cleaning filter assembly
US8734641B2 (en) 2010-09-08 2014-05-27 Anthony Collins Tertiary wastewater filtration using inclined filter media and internal reverse flow backwashing of filter disks
US8778174B2 (en) * 2010-10-15 2014-07-15 Alfa Laval Ashbrook Simon-Hartley Inc. Methods and apparatus for treating water and wastewater employing a cloth disk filter
WO2013032085A1 (en) * 2011-08-31 2013-03-07 (주)에이앤티 Suctioning apparatus for a fibrous filter, and filtering device using same
US8852445B2 (en) * 2011-10-28 2014-10-07 Alfa Laval Ashbrook Simon-Hartley, Inc Methods and apparatus for treating water and wastewater employing a cloth disk filter
US10195549B1 (en) * 2017-11-21 2019-02-05 Aqua-Aerobic Systems, Inc. Backwash shoe method and apparatus that increases effective surface area of cloth filter media

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640395A (en) * 1970-09-14 1972-02-08 Kinney Eng Inc S P Automatic self-cleaning strainer
US4090965A (en) * 1971-12-29 1978-05-23 Mecafina Sa Installation for the mechanical-biological purification of waste water
US4639315A (en) * 1984-10-18 1987-01-27 Mecapec S.A. Apparatus for mechanical purification of waste water
US4923600A (en) * 1987-08-28 1990-05-08 Lenox Institute For Research, Inc. Water clarification system adapted for removing particulate matter of greater than a predetermined size
US5356532A (en) * 1993-04-13 1994-10-18 Perfection Sprinkler Co. Use of a multi-apertured plastic pipe in the drive and structure of a rotary self-cleaning strainer
US5362401A (en) * 1993-12-14 1994-11-08 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning a filter apparatus
US5374360A (en) * 1993-12-14 1994-12-20 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning a filter apparatus
US5409618A (en) * 1993-11-03 1995-04-25 Kenneth E. Price Fluid classifier
US5876612A (en) * 1997-03-03 1999-03-02 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning filter material in a filter apparatus
US5951878A (en) * 1998-03-20 1999-09-14 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning filter material in a filter apparatus utilizing a suction generating nozzle
US6267879B1 (en) * 1999-08-11 2001-07-31 Odis Irrigation Equipment Ltd. Continuous liquid filtering apparatus with multi-layer sintered filtering element

Family Cites Families (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080975B (en) * 1954-08-31 1960-05-05 Fas Flo Filter Corp disc filter
US2996189A (en) * 1959-10-22 1961-08-15 Port Oils Inc X Filter screen installation
US4082664A (en) * 1976-07-22 1978-04-04 Ecodyne Corporation Filter and method
US4152265A (en) * 1977-08-19 1979-05-01 Aqua-Aerobic Systems, Inc. Filter apparatus
JPS6216125B2 (en) * 1978-09-26 1987-04-10 Ebara Infilco
US4412920A (en) * 1979-11-07 1983-11-01 Bolton Joseph A Filter with top spray
US4540487A (en) * 1984-05-29 1985-09-10 Aqua-Aerobic Systems, Inc. Filter apparatus
SU1243768A1 (en) * 1984-08-22 1986-07-15 Gerasimovich Igor K Self-cleaning filter
US4627922A (en) * 1984-10-29 1986-12-09 Gilley And Associates Method of removing dissolved oil from produced water
DE3903813C1 (en) * 1989-02-09 1990-06-07 Bott, Reinhard, Dr.-Ing.
DE69104605T2 (en) * 1990-02-16 1995-06-08 Frykhult R Ingf Ab Liquid filtering device.
SE465657B (en) * 1990-02-28 1991-10-14 Filterteknik Bw Ab Saett and apparatus foer filtering partikelbemaengd vaetska
US5354455A (en) * 1990-05-22 1994-10-11 Filtercorp Partners L.P. Double-density commercial filtering system
US5667683A (en) * 1992-06-17 1997-09-16 Benian Filter Company, Inc. Backwashable liquid filter system using rotating spray
DE4320952A1 (en) 1993-06-24 1995-01-12 Uwe Maurer Pressure filter with evenly pressed backwashing head
US5643459A (en) * 1995-04-26 1997-07-01 Cominco Engineering Services Ltd. Flotation method and apparatus
US5653874A (en) * 1995-06-06 1997-08-05 Claude Laval Corporation Self-cleaning screen for a pump inlet bay
DE19624483A1 (en) * 1996-06-19 1998-01-02 Mecana Umwelttechnik Ag Filter cloth, filtering method and filtering device for liquid filtration
US5958240A (en) * 1997-05-19 1999-09-28 Hoel; Timothy L. System for recycling waste water
US6090298A (en) * 1997-12-10 2000-07-18 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning filter material in a filter apparatus utilizing a suction generating assembly
US5932091A (en) * 1998-01-22 1999-08-03 The United States Of America As Represented By The Secretary Of The Navy Oily waste water treatment system
US6110374A (en) * 1998-06-30 2000-08-29 Aqua-Aerobic Systems, Inc. Treatment process for removing microbial contaminants suspended in wastewater
DE29911482U1 (en) * 1999-07-01 1999-12-30 C & H Werkzeugmaschinen Gmbh Device for maintaining and cleaning a working medium
US6875357B1 (en) * 2000-03-15 2005-04-05 Aqua-Aerobic Systems, Inc. Process and apparatus for treatment of waste water
US6447617B1 (en) * 2000-03-17 2002-09-10 Aqua-Aerobic Systems, Inc. High efficiency cleaning of rotating filter media
US6294098B1 (en) * 2000-05-23 2001-09-25 Aqua-Aerobics System, Inc. High efficiency backwash shoe
US6616834B2 (en) * 2001-10-14 2003-09-09 Jim Anderson Wastewater processor
US6854157B2 (en) 2002-02-13 2005-02-15 Federal Signal Corporation Debris collection systems and vehicles
US6797186B2 (en) * 2002-06-26 2004-09-28 Aqua-Arobics Systems, Inc. Fluidized solids removal with pulsation
US6793823B2 (en) * 2002-08-07 2004-09-21 Aqua-Aerobics Systems, Inc. Wastewater solids removal methods
US6858140B2 (en) * 2002-12-26 2005-02-22 Aqua-Aerobic Systems, Inc. Processes and devices for water and wastewater treatment, including stationary cloth media filtration
US7172688B2 (en) * 2003-12-08 2007-02-06 Petersen Robert N Mixed immiscible liquids vacuum, separation, and disposal method and system (Mod 1)

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640395A (en) * 1970-09-14 1972-02-08 Kinney Eng Inc S P Automatic self-cleaning strainer
US4090965A (en) * 1971-12-29 1978-05-23 Mecafina Sa Installation for the mechanical-biological purification of waste water
US4639315A (en) * 1984-10-18 1987-01-27 Mecapec S.A. Apparatus for mechanical purification of waste water
US4923600A (en) * 1987-08-28 1990-05-08 Lenox Institute For Research, Inc. Water clarification system adapted for removing particulate matter of greater than a predetermined size
US5356532A (en) * 1993-04-13 1994-10-18 Perfection Sprinkler Co. Use of a multi-apertured plastic pipe in the drive and structure of a rotary self-cleaning strainer
US5409618A (en) * 1993-11-03 1995-04-25 Kenneth E. Price Fluid classifier
US5362401A (en) * 1993-12-14 1994-11-08 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning a filter apparatus
US5374360A (en) * 1993-12-14 1994-12-20 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning a filter apparatus
US5876612A (en) * 1997-03-03 1999-03-02 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning filter material in a filter apparatus
US5951878A (en) * 1998-03-20 1999-09-14 Aqua-Aerobic Systems, Inc. Method and apparatus for cleaning filter material in a filter apparatus utilizing a suction generating nozzle
US6267879B1 (en) * 1999-08-11 2001-07-31 Odis Irrigation Equipment Ltd. Continuous liquid filtering apparatus with multi-layer sintered filtering element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070045200A1 (en) * 2005-08-30 2007-03-01 Moon Won J Gathering method and apparatus of powder separated soluble component
US7799236B2 (en) * 2005-08-30 2010-09-21 Lg Chem, Ltd. Gathering method and apparatus of powder separated soluble component
WO2016074145A1 (en) * 2014-11-11 2016-05-19 崔楠 Filter gas backwash device

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DE102004001506B4 (en) 2008-10-09
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US20050000870A1 (en) 2005-01-06
DE102004001506A1 (en) 2004-07-29

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