WO2000007487A1 - Filtre cylindrique - Google Patents

Filtre cylindrique Download PDF

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Publication number
WO2000007487A1
WO2000007487A1 PCT/US1999/017752 US9917752W WO0007487A1 WO 2000007487 A1 WO2000007487 A1 WO 2000007487A1 US 9917752 W US9917752 W US 9917752W WO 0007487 A1 WO0007487 A1 WO 0007487A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
filter basket
liquid
basket
piston head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1999/017752
Other languages
English (en)
Inventor
Stephen N. Mcewen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henry Filters Inc
Original Assignee
Henry Filters Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henry Filters Inc filed Critical Henry Filters Inc
Priority to AU54664/99A priority Critical patent/AU5466499A/en
Publication of WO2000007487A1 publication Critical patent/WO2000007487A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
    • 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
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
    • B01D29/82—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression
    • B01D29/824—Handling the filter cake in the filter for purposes other than for regenerating for drying by compression using pistons
    • 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
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/80—Handling the filter cake in the filter for purposes other than for regenerating for drying
    • B01D29/84—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating
    • B01D29/843—Handling the filter cake in the filter for purposes other than for regenerating for drying by gases or by heating by direct contact with a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/001—Filters in combination with devices for the removal of gas, air purge systems

Definitions

  • the present invention relates to filters for filtering contaminants from liquids and, more particularly, to briquette filters.
  • these filters are typically immersed in a liquid compartment filled with a contaminated liquid.
  • a pump connected to the interior of the filter evacuates liquid creating a pressure differential in which the interior is at a lower pressure than the pressure outside of the filter.
  • Contaminated liquid then passes through the perforations from the liquid compartment into the interior.
  • a contaminant filter cake eventually forms on the exterior of the filter. Periodically, the exterior of the filter is scraped to remove the filter cake.
  • the pump may pump the filtered liquid to an end use. For instance, filtered machine tool coolant pumped to machine tools for cooling and lubricating purposes.
  • a primary disadvantage to using drum and disc filters is that the magnitude of the pressure differential is limited in order to prevent structural damage to the filter. Consequently, the rate and quality of filtration is limited. Using a higher differential to force liquid through a thick filter cake provides for removal of smaller particulate than using a thin filter cake.
  • a cylindrical filter is capable of handling higher pressure differentials than the differentials capable of being handled by drum and disc filters.
  • a pump pumps contaminated liquid into the interior of the cylindrical filter causing the pressure on the liquid to be higher than the pressure outside of the filter.
  • filtered liquid passes through perforations in the cylindrical filter with contaminants of the liquid being captured on the inside of the filter.
  • the cylindrical filter structural member is mechanically loaded in tension in the circumferential or hoop direction.
  • filtration must eventually be interrupted to remove the filter cake from within the cylindrical filter.
  • the briquette squeezes liquid from the filter cake to produce a compact briquette of waste material.
  • the process of filtering liquid, removing the wet filter cake from the cylindrical filter, and then squeezing liquid from the wet filter cake to create a generally liquid free briquette is time consuming. Further, the filtration process must be stopped while the filter cake is removed from the cylindrical filter. Consequently, the supply of filtered liquid is interrupted when using a conventional cylindrical filter.
  • the present invention provides a cylindrical filter for filtering contaminants from a contaminated liquid.
  • the cylindrical filter includes a filter chamber having an outer housing and a perforated filter basket disposed within the housing. An open annular region is defined between the housing and the filter basket.
  • the filter chamber further includes an elongated cylindrical bore within the filter basket having first and second ends. An inlet fluidly communicates with the cylindrical bore of the filter basket and an outlet fluidly communicates with the open annular region. Contaminated liquid passes through the inlet into the filter basket with liquid passing through the perforations of the filter basket into the open annular region and then out of the outlet while contaminants are captured and form a filter cake on the inner surface of the basket.
  • a first cylinder including a first piston and a first piston head seals with the first end of the cylindrical bore of the filter basket.
  • a second piston head seals with the second end of the cylindrical bore of the filter basket. The first piston head is movable relative to the second piston head to remove the filter cake from the filter basket and compress the contaminants into a briquette.
  • a filtration system is also provided.
  • FIGURE 1 is a schematic view of a filter system utilizing a plurality of interconnected cylindrical filters in accordance with the present invention
  • FIGURE 2 is a top view of a cylindrical filter in a closed position ready to filter a contaminated liquid;
  • FIGURE 3 is a side view of the cylindrical filter shown in Figure 2;
  • FIGURE 4 is a side view of the cylindrical filter, partially in section, in the closed position;
  • FIGURE 5 is a side view of the cylindrical filter, partially in section, in an open or index position with a briquette being ejected from the filter;
  • FIGURE 6 is an elevational view of a first end plate;
  • FIGURE 7 is an elevational view of a second end plate.
  • FIG. 1 illustrates a filtration system 20 having a plurality of interconnected cylindrical filters 22a-e arranged in a parallel configuration. Each of filters 22a-e are generally identical to one another. An exemplary filter 22 and its operation will first be described. Then, the overall operation of filtration system 20 employing filters 22a-e will be described. Referring now to Figures 2-5, filter 22 includes a filter chamber
  • Ram cylinder 26 and plug cylinder 30 are generally conventional hydraulically operated cylinders.
  • Ram and plug cylinders 26 and 30 are supported by respective ram and plug frames 32 and 34.
  • Ram frame 32 includes a pair of top bars 36 and a pair of bottom bars 40.
  • a cross-bar 42 extends laterally across ram frame 32 and serves to anchor ram cylinder 26.
  • a first end plate 44 of filter chamber 24 supports the inboard ends of top and bottom bars 36 and 40.
  • the outboard ends of top and bottom bars 36 and 40 are threaded and may be readily affixed to supports (not shown).
  • plug frame 34 has a pair of top bars 50 and a pair of bottom bars 52.
  • a cross-bar 54 extends laterally across the outboard end of plug frame 34.
  • the end of plug cylinder 30 is anchored to cross-bar 54.
  • a second end plate 56 of filter chamber 24 is disposed at the inboard end of plug frame 34 and supports the inboard ends of top and bottom bars 50 and 52.
  • the outboard or distal ends of top and bottom bars 50 and 52 are threaded so as to be affixed to supports (also not shown).
  • Hydraulic lines (not shown) are attached to fluid couplings 72 and 74 to operate ram cylinder 26 in a manner conventional for hydraulic cylinders.
  • Ram cylinder 26 includes a fluid cylinder 60, a piston 62, and a piston head 64.
  • the end of fluid cylinder 60 has a pair of ears 66 through which cross-bar 42 passes thereby attaching fluid cylinder 60 to the outboard end of ram frame 32.
  • Fluid couplings 72 and 74 pass fluid into and out of fluid cylinder 60 to axially control the movement of piston 62 and piston head 64.
  • piston head 64 includes an annular backing plate 80 to which an elastomeric annular plate
  • a mounting collar 84 mounts backing plate 80 to piston 62.
  • Plug cylinder 30 includes a fluid cylinder 90, a piston 92, and a piston head 94.
  • Piston head 94 includes a backing plate 96, a plurality of circumaxially spaced column members 98, and an inboard baffle plate 100 spaced from backing plate 96.
  • Backing plate 96 has openings 102 therein.
  • Ears 91 located at the outboard end of fluid cylinder 90 receive crossbar 54 therethrough to anchor the end of plug cylinder 30 relative to plug frame 34.
  • filter chamber 24 includes outer housing 104, a cylindrical perforated filter basket 106 disposed radially within the outer housing, the aforementioned first and second end plates 44 and 56, a pair of top bars 110, and a pair of bottom bars 112. Bars 110 and 112 are used to clamp end plates 44 and 56 against outer housing 104 and filter basket 106.
  • An annular open region 108 is defined between outer housing 104 and filter basket 106.
  • An inlet coupling 114 is fluidly connected with outer housing 104 to permit contaminated liquid to enter the outer housing 104 and filter basket 106.
  • an outlet 116 in fluid communication with open region 108, permits filtered liquid to leave filter 22.
  • a T-coupling 118 is attached to coupling 116.
  • a vent 120 affixes to outer housing 104 and is in communication with open region 108.
  • End plates 44 and 56 have respective inner bores 122 and 124, as best seen in Figures 6 and
  • piston head 64 of ram cylinder 26 seals with inner bore 122 of end plate 44 while piston head 94 of plug cylinder 30 seals with inner bore 124 of end plate 56, as illustrated in Figure 4.
  • Contaminated liquid enters inlet 114 and passes to the open region defined between backing plate 96 and baffle plate 100 of piston head 94 of plug cylinder 30. Contaminated fluid then passes axially through openings 102 of baffle plate 100 to fill the interior of filter basket 106. Air within filter chamber 24 is exhausted through vent 120. Filtered fluid passes through perforations in filter basket 106 and into annular open region 108. The filtered liquid then leaves filter 22 by way of outlet coupling 116 and T- coupling 118.
  • ram cylinder 26 and plug cylinder 30 are actuated such that piston heads 64 and 94 again seal within inner bores 122 and 124 of end plates 44 and 56.
  • a liquid containing a pre-coat of filter material may then be cycled through filter 22 to create an initial layer of filter cake. Contaminated liquid is then again introduced into inlet 114 so that the filtration process can be repeated.
  • filtration system 20 includes a return line 150 which dumps contaminated liquid into a dirty liquid reservoir or sump 152.
  • a pump 154 pumps the contaminated liquid from sump 152 to the plurality of interconnected filters 22a-e. Located downstream of pump
  • Inlet passageway 156 includes respective inlet conduits 160a-e, each having a respective inlet valve 162a-e. Each of inlet valves 162a-e is controlled by electrically operated actuators 164a-e. Inlet conduits 160a-e, although not explicitly shown, are attached to respective inlets 114 of the respective filters 22a-e. On the exit or downstream side of filters 22a-e, filter system 20 has outlet conduits 166a-e, each of which has an outlet valve 170a-e controlled by actuators 172a-e. The combined outlet conduits 166a-e are part of an overall branched outlet passageway 174.
  • Outlet conduits 166a-e are connected to a respective branch of T-coupling 118 of filters 22a-e.
  • Filtered liquid from branched outlet passageway 174 passes downstream to a desired end use, such as to machine tools where the filtered liquid cools and lubricates machine tools and again picks up contaminants with the contaminated liquid returning to sump 152 by way of return conduit 150.
  • Filtration system 20 also includes an air supply 176, an air compressor 180 which provides pressurized air to the air supply, and a branched air passageway 182.
  • Branched air passageway 182 includes five air conduits 184a-e which connect to inlet conduits 160a-e downstream from inlet valves 162a-e.
  • Air conduits 184a-e have respective electrically controlled air valves 186a-e for controlling the flow of air to filters 22a-e. Air is supplied to filters 22a-e after a filtration cycle has been completed to blow liquid out of the filter cake prior to the compacting of the filter cake into a briquette (B).
  • Filtration system 20 also includes a pre-coat system 190.
  • Pre- coat system 190 includes a hopper 192, a sump 194, a pump 196, and a branched pre-coat passageway 200.
  • Hopper 192 stores a fibrous pre-coat material such as HF-40 which is sold by Henry Filters, Inc. of Bowling
  • Pre-coat passageway 200 includes conduits 202a-e which connect to respective inlet conduits 160a-e as shown.
  • the flow of pre-coat material to inlet conduits 160a-e is controlled by electrically actuated pre-coat valves 204a-e.
  • On the downstream side of filters 22a-e is a branched pre-coat return passageway 206 which returns liquid from the filters to sump 194.
  • Pre- coat return passageway 206 includes return conduits 210a-e which are fluidly connected to a respective branch of T-couplings 118 of filters 22a-e opposite that of outlet conduits 166a-e.
  • the flow of liquid through return conduits 210a-e to sump 194 is controlled by actuated valves 212a-e.
  • Sump 194 may also receive liquid through a refill line 214 connected to branched outlet passageway 174.
  • Contaminated liquid such as machine tool coolant containing machine chips and other debris
  • Pump 154 then pumps the contaminated liquid from dirty liquid sump 152 through branched inlet passageway 156 to three of the five respective filters 22c-e.
  • Filters 22a-b are undergoing other operations to be described later.
  • its respective inlet valve 162 in an inlet conduit 160 must be open.
  • filters 22c, 22d, and 22e are receiving and filtering contaminated liquid from sump 152 and pump 154.
  • Contaminated liquids pass into inlets 114 and through the openings 102 in baffle plates 100 to reach the interior of filter baskets 106. Because the contaminated liquid enters into the center of filter baskets 106, the opportunity to knock a filter media pre-coat from the inner walls of filter baskets 106 is reduced. Contaminants are captured within filter baskets 106 as liquid passes through perforations in the filter baskets reaching annular regions 108 defined between the baskets and outer housings 104. The filtered liquid then proceeds to exit through outlets 116 to respective outlet conduits 166c-e of branched outlet passageway 174. Valves 170c-e are open. The filtered liquid is then returned to a source, such as machine tools, for further use. After the filtered liquid has been again contaminated, the contaminated liquid is returned to sump 152 by way of return conduit 150. While this filtering process is continuously occurring in filters
  • inlet valve 162 is closed to prevent fluid from being pumped from pump 154 to filter 22a.
  • pre-coat valve 204a is closed.
  • outlet valve 170 is closed preventing a back flow of pressurized liquid from branched outlet passageway 174 into filter chamber 24a.
  • valve 212a is also closed. Air from air supply 176 is passed to filter chamber 24a by opening air valve 186a to partially dry the filter cake therein. Then, air valve 186a is closed.
  • Ram cylinder 26 is activated to scrape and compress filter cake inside filter chamber 24a. After sufficient liquid has been squeezed from the filter cake to form briquette (B), plug cylinder 30 is actuated to open filter chamber 24a so that briquette (B) can be disposed of as depicted in Figure 5. Ram and plug cylinders 26 and 30 are then returned to their normal operating positions as shown in Figure 4. In the event that very fine paniculate are to be filtered from the contaminated liquid of dirty liquid sump 152, it may be desirable to pre-coat filters 22 prior to returning a particular filter to its filtering operation.
  • a filter pre-coat can be applied to a filter basket 106 such as in filter 22b.
  • inlet and outlet valves 162b and 170b are closed to remove filter 22b from the normal filtration operation.
  • air valve 186b is closed.
  • a pre-coat media, from hopper 192 is mixed with liquid in sump 194.
  • the liquid and filter pre- coat mixture in sump 194 is pumped by pump 194 through branched pre-coat passageway 200. Only pre-coat valve 204b of pre-coat valves 204a-e is opened.
  • the liquid and pre-coat mixture is introduced into filter 22b with the inner walls of filter basket 106 being coated with the filter pre-coat media. Liquid filtered from the pre-coat liquid mixture passes out of filter 22b and is returned by way of return conduit 210b to sump 194 by opening valve 212b. The above described loop of liquid flow is continued until a desired amount of pre-coat is disposed within filter basket 106 of filter 22b. Generally, the amount of time necessary to achieve a desired pre-coat thickness inside the filter basket 106 for a particular type of size and contaminant to be filtered is determined experimentally prior to the system 20 being put into full production operation. Pre-coat inlet valve 204b and outlet valve 212b are closed when sufficient pre-coat has been accumulated. Inlet valves 164b and outlet valve 170b are then opened to return filter 22b to the filtration operation.
  • the individual filters 22a-e are periodically cleaned, pre-coated with filter media, and placed into filtration operations to keep filtration system 20 continuously producing a filtered liquid.

Landscapes

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

Abstract

Filtre cylindrique servant à filtrer des contaminants depuis un liquide contaminé et comprenant une chambre comportant un boîtier extérieur (104) et un panier-filtre perforé (106) situé à l'intérieur du boîtier. Une zone annulaire ouverte (108) est définie entre le boîtier et le panier-filtre. Un alésage cylindrique allongé se trouve à l'intérieur du panier-filtre. Le liquide contaminé pénètre dans le panier-filtre et traverse les perforations de ce panier-filtre afin de pénétrer dans la zone annulaire ouverte, tandis que les contaminants sont piégés et forment un gâteau de filtration sur la surface intérieure du panier-filtre. Un premier cylindre (30) comprenant un premier piston (92) et une première tête de piston (94) crée une étanchéité à une extrémité de l'alésage cylindrique et une deuxième tête de piston (80) crée une étanchéité à l'autre extrémité de l'alésage cylindrique. Les têtes de piston sont mobiles les unes par rapport aux autres afin de retirer le gâteau de filtration du panier-filtre, de comprimer les contaminants sous forme de briquette et d'éjecter la briquette hors de la chambre du filtre.
PCT/US1999/017752 1998-08-06 1999-08-05 Filtre cylindrique Ceased WO2000007487A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54664/99A AU5466499A (en) 1998-08-06 1999-08-05 Cylindrical filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13000498A 1998-08-06 1998-08-06
US09/130,004 1998-08-06

Publications (1)

Publication Number Publication Date
WO2000007487A1 true WO2000007487A1 (fr) 2000-02-17

Family

ID=22442594

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/017752 Ceased WO2000007487A1 (fr) 1998-08-06 1999-08-05 Filtre cylindrique

Country Status (2)

Country Link
AU (1) AU5466499A (fr)
WO (1) WO2000007487A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008144290A3 (fr) * 2007-05-15 2009-04-23 Pitco Frialator Inc Appareil de filtrage fonctionnant en continu
CN105266557A (zh) * 2015-12-03 2016-01-27 广东技术师范学院 一种高效自动水果榨汁机及其榨汁方法
CN111096132A (zh) * 2019-12-24 2020-05-05 重庆酷熊科技有限公司 液体有机肥用去除钙镁离子专用包

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE39934C1 (fr) *
US2221806A (en) * 1938-01-20 1940-11-19 Evarts G Loomis Dehydrating press and method of dehydrating
US2800072A (en) * 1954-04-28 1957-07-23 American Viscose Corp Cylindrical press assembly
US3550775A (en) * 1968-03-29 1970-12-29 William L Cooley Method and means for separating entrained liquids from solids
US3900403A (en) * 1973-03-29 1975-08-19 Steetley Mfg Ltd Filtration apparatus
US4085050A (en) * 1975-07-02 1978-04-18 Enzo Gervasi Continuous filter with continuous cake removal
US4208188A (en) * 1978-03-22 1980-06-17 Signet Corporation Consolidation of coal slurry
US4303412A (en) * 1979-03-27 1981-12-01 Baikoff Eugene M A Method and apparatus for compressively separating waste material
US4971705A (en) * 1989-08-14 1990-11-20 Donald Roslonski Method and apparatus for dewatering material
US5050493A (en) * 1990-03-06 1991-09-24 The United States Of America As Represented By The Secretary Of Interior Bi-directionally draining pore fluid extraction vessel
US5377423A (en) * 1992-09-11 1995-01-03 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE39934C1 (fr) *
US2221806A (en) * 1938-01-20 1940-11-19 Evarts G Loomis Dehydrating press and method of dehydrating
US2800072A (en) * 1954-04-28 1957-07-23 American Viscose Corp Cylindrical press assembly
US3550775A (en) * 1968-03-29 1970-12-29 William L Cooley Method and means for separating entrained liquids from solids
US3900403A (en) * 1973-03-29 1975-08-19 Steetley Mfg Ltd Filtration apparatus
US4085050A (en) * 1975-07-02 1978-04-18 Enzo Gervasi Continuous filter with continuous cake removal
US4208188A (en) * 1978-03-22 1980-06-17 Signet Corporation Consolidation of coal slurry
US4303412A (en) * 1979-03-27 1981-12-01 Baikoff Eugene M A Method and apparatus for compressively separating waste material
US4971705A (en) * 1989-08-14 1990-11-20 Donald Roslonski Method and apparatus for dewatering material
US5050493A (en) * 1990-03-06 1991-09-24 The United States Of America As Represented By The Secretary Of Interior Bi-directionally draining pore fluid extraction vessel
US5377423A (en) * 1992-09-11 1995-01-03 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008144290A3 (fr) * 2007-05-15 2009-04-23 Pitco Frialator Inc Appareil de filtrage fonctionnant en continu
US8828223B2 (en) 2007-05-15 2014-09-09 Pitco Frialator, Inc. Continuously operating filtering apparatus
US9532681B2 (en) 2007-05-15 2017-01-03 Pitco Frialator, Inc. Continuously operating filtering apparatus
US10433674B2 (en) 2007-05-15 2019-10-08 Pitco Frialator, Inc. Continuously operating filtering apparatus
CN105266557A (zh) * 2015-12-03 2016-01-27 广东技术师范学院 一种高效自动水果榨汁机及其榨汁方法
CN111096132A (zh) * 2019-12-24 2020-05-05 重庆酷熊科技有限公司 液体有机肥用去除钙镁离子专用包

Also Published As

Publication number Publication date
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