WO1995027551A1 - Systeme de filtration acoustique/a tamis, autonettoyant, pour separation de solides/liquides - Google Patents

Systeme de filtration acoustique/a tamis, autonettoyant, pour separation de solides/liquides Download PDF

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Publication number
WO1995027551A1
WO1995027551A1 PCT/US1995/004306 US9504306W WO9527551A1 WO 1995027551 A1 WO1995027551 A1 WO 1995027551A1 US 9504306 W US9504306 W US 9504306W WO 9527551 A1 WO9527551 A1 WO 9527551A1
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WO
WIPO (PCT)
Prior art keywords
screen
liquid
vessel
solids
mixture
Prior art date
Application number
PCT/US1995/004306
Other languages
English (en)
Inventor
J. Robert Woolsey
Brian G. Noakes
Valery Yamshchikov
Semyon Shkundin
Original Assignee
The University Of Mississippi
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 The University Of Mississippi filed Critical The University Of Mississippi
Priority to AU22810/95A priority Critical patent/AU2281095A/en
Publication of WO1995027551A1 publication Critical patent/WO1995027551A1/fr

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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
    • B01D29/11—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
    • B01D29/114—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 inward flow filtration
    • B01D29/115—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 inward flow filtration open-ended, the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of 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
    • B01D29/11—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
    • B01D29/118—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 open-ended
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B01D29/606—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by pressure measuring
    • 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
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/661—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by using gas-bumps
    • 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
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/663—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by using membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D33/506—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a stirrer placed on the filtrate side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • B01D33/727—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding provoking a tangential stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/02—Filtering elements having a conical form
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/08—Regeneration of the filter
    • B01D2201/088—Arrangements for killing microorganisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis
    • 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
    • B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
    • B01D29/605—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by level measuring

Definitions

  • Fig. 1 is an elevational view in cross-section of a first embodiment of the invention
  • Fig. 3 is an elevational view in cross-section of a third embodiment of the invention.
  • Fig. 4A is an elevational view in cross-section of a fourth embodiment of the invention.
  • Fig. 4B is a cross-section of Fig. 4A taken along line B- B;
  • Fig. 5 is an elevational view of the embodiment of Fig. 2A in more detail.
  • the acoustic pressure waves are preferably within the range of about 5 to 120 Hz.
  • the inlet may be through the vessel top wall, or through the vessel side wall to direct mixture tangentially into the vessel.
  • a gravity tank for holding liquid/solid mixture, connected to the inlet, may be used to provide a pressure head for the mixture into the vessel, and means may be provided for regulating the pressure differential between the inlet and at least one of the outlets.
  • the vessel may be shaped in many ways. For example, it may be shaped as a cylinder or have inwardly sloping walls, and may have a inner partition wall to divide the vessel into two chambers.
  • the screen may also have different shapes, including planar panels, a cone, oriented with its apex up or apex down, or a cylinder. The screen may also rotate.
  • the vibrator means may comprise an energy source directly coupled with the liquid, such as a high voltage sparking device for producing a high voltage arc, or a water gun device having a vibrating shuttle bolt.
  • the apparatus may be used for various types of liquid/solid mixtures, including by way of example but not limitation an aqueous slurry having solid coal fines, an aqueous slurry having solid industrial minerals, processing water from foodstuff processing having organic particulate solids, an aqueous slurry having solid mineral products processed by hydrometallurgical mean sewage, or chemical or pharmaceutical product slurry.
  • the mixture may be introduced into the vessel tangentially, and preferably, under pressure.
  • the pressure at which the mixture is introduced may be maintained within a selected range.
  • the acoustic pressure waves may be created by moving a diaphragm connected to an energy source.
  • An energy source 8a is coupled to a diaphragm 8b by suitable linkage or push rod 8C and the diaphragm generates acoustic pressure waves, the frequency of which may range from infrasonic (below 20 Hz) to the lower sonic ( ⁇ 500 Hz) , and preferably in the range of infrasonic to very low sonic ( ⁇ 120 Hz) , with appropriate corresponding amplitudes.
  • the term “low sonic” means below about 500 Hz and "very low sonic" means about 120 Hz.
  • the diaphragm 8b is horizontally oriented (vertically mounted) and is attached to the partition la.
  • the partition la and diaphragm 8b divide the vessel 1 into two processing chambers, with the diaphragm serving as a double acting diaphragm, interacting directly with liquid in each chamber.
  • a positive pressure wave will result in the direction of diaphragm movement, and a negative pressure wave will result on the other side of the diaphragm.
  • Each chamber is in turn divided into an upper and lower section by the screen 7a.
  • This arrangement provides for utilizing infrasonic or sonic energy generated by an appropriate source, and transmitting the energy by hydraulic pressure waves through the entire volume of the solids/liquid mixture.
  • a desired effect of this application of acoustic energy and resulting pressure waves is the inducement of separation of the particulate solids from the host liquid through the breakdown of surface tension.
  • This acoustically induced deterioration of surface tension is primarily a result of acceleration forces, but is also influenced by the physical and chemical characteristics of the solids/liquid mixture to the extent that such variables affect factors like acoustic impedance and inertial/elastic forces which in turn effect critical processes such as vibra-agitation (threshold of cavitation) and avitation.
  • the pressure waves couple hydraulically with the screen, progressively and continually sweeping the screen surface.
  • the effect of the positive and negative semiperiod pressure wave sweep (which may or may not be equal in amplitude and/or period) may be described as an oscillatory force field acting on and through the screen.
  • a means of supporting or stabilizing the screen may be provided so as to limit or control the degree of surface flex induced by the pressure waves to an appropriate level.
  • Superimposed on the functioning system is a hydrostatic pressure head on the solids/liquid mixture feed sufficient to induce sustained flow through the screen to the processed liquid outlet ports 3.
  • Screen mesh size should correspond to the minimum size of particles to be retained or filtered from the host liquid.
  • a typical mesh size range for an embodiment according to the invention might extend from ⁇ 1 to 200 microns, but with regard to efficiency and application relative to existing technology, 1.0 to 100 microns is preferred.
  • Fig. 2A show another embodiment according to the invention.
  • a vessel 1 of generally cylindrical shape has an inlet port 2a for receiving liquid/solid mixture from gravity tank 6, a screen 7b having a funnel shape with a bottom outlet whereby the liquids pass through the screen and the solids are retained to pass through a bottom outlet 4, regulated by valve 5.
  • the liquids pass through outlet 3 regulated by valve 5.
  • a diaphragm 8b is arranged at the bottom of the vessel, and is coupled to energy source 8a to provide acoustic waves through the liquid which impact screen 7b.
  • Fig. 2B shows a modification of the another embodiment of Fig. 2A according to the invention.
  • Fig. 2B shows a similar arrangement to that of Fig.
  • the shuttle bolt (mounted singly or in multiples) is designed to rapidly displace a selectable volume of liquid varying from approximately 1 to 20 cubic inches and cycle at a selectable rate from 1 to 20 times per second, producing a desired repetitive energy pulse in the liquid of the lower filter chamber ranging from 50 to 1500 joules; the higher power settings corresponding to the lower firing rates and vice versa.
  • Solids outlet 4, regulated by an associated valve 5 allows the solids to be removed.
  • a diaphragm 8b is arranged to provide acoustic waves through the liquid which waves impact the screen 7b.
  • the bottom of the screen is fitted with a donut shaped diaphragm 8b encompassing the shaft and driven by a nesting pair of circular cams 8al and 8a2 centered on shaft.
  • the upper part 8a2 of the cam fitted to the diaphragm 8b, is free to slide on the shaft with an up and down motion, driven by the fixed bottom half 8al, completing a full cycle in 360° of rotation.
  • the tangential inlet arrangement promotes some separation of solid particles by centrifugal force.
  • the rotation of the screen 7b may further enhance solids residue dispersal and cleaning of the screen by centrifugal force.
  • Figs. 4A and 4B show yet another embodiment according to the invention comprising a vessel 1 having downwardly depending walls which end at a solids outlet 4 regulated by an associated valve 5.
  • Gravity tank 6 provides liquid/solid mixture to the vessel 1 through a tangentially connected inlet 2b.
  • the screen 7b is cylindrical and stationary.
  • An impeller 9b rotated by motor 9a provides the energy source to generate acoustic pressure waves against the screen.
  • the impeller is a squirrel cage, modified vane, impeller.
  • Fig. 4B shows the cross-section of the impeller 9b as having vane sections 9c, each section having a pair of oppositely oriented blades 9c-l and 9c-2.
  • These blades when rotated generate cyclic alternations of positive and negative semiperiod pressure waves sweeping a given line on the surface of the cylindrical screen at a given time or a full sweep of 360° in unit time.
  • the screen could be conical, with the impeller conical as well.
  • Fig. 5 shows the embodiment of Fig. 2 in somewhat greater detail.
  • the vessel 1 has a vibrator energy source 8a at its bottom and is shock mounted with vibration damping rubber 15 and springs 16 at the base.
  • the conical screen 7b is supported by a wire frame for increased strength and stability.
  • the cone When the cone is oriented with the apex down, it may form a funnel with a solids outlet at the bottom so as to function as a means of filtering out particulate solids from the mixture feed, produce a filtrate liquid and concentrate the solids residue, directing it by gravity flow to the funnel outlet.
  • the energy sources can be any type of mechanical or electro-mechanical vibratory sources acting through one or more diaphragms that contact the liquid directly on one or both sides, below or above the screen, or as described above in connection with Fig. 2B.
  • the efficiency of the solids/liquid separation process according to the invention may be enhanced by tuning the operating frequency of the energy source to the material resonance frequency of the system to effect mass oscillation of the liquid in sync with the diaphragm. In some cases such as high solids to liquid ratios, it may be necessary or desirable to arrange a second diaphragm above the screen to insure sufficient acoustic energy input for desired separation effect.
  • the upper diaphragm should preferably be synchronized in order to assist and not interfere with the lower diaphragm, or be of a sufficiently different high or low frequency so as not to interfere.
  • the acoustic energy induces hydraulic pressure waves consisting of positive and negative semiperiods (which may or may not be equal in amplitude or period) which couple with the screen.
  • This induces an oscillatory field of flux which acts on and through the screen surface, the resultant effect of which further serves to promote solids/liquid separation, through pressure squeezing of concentrated clouds of solid particles.
  • the filtration of the solid/liquid mixture via the screen to produce a liquid filtrate solution, and solids residual fraction is effected primarily by the negative semiperiod pressure waves and the superimposed hydrostatic head pressure.
  • the screen is protected from binding of the solids thereto by the cyclic generation of a boundary layer ripple effect.
  • the pressure waves also induce self-cleaning of the screen by cyclic hydraulic backwash effected by the sweep of the positive semiperiod pressure waves.
  • the present invention has application to separating and filtering organic particulate solids from processing or chiller water in the processing of chemical slurry, raw pharmaceutical products, produce, meat products (such as poultry, pork, beef and seafood) , so as to clean and promote purification of the processing or chiller water to industry standards for continuous recycling or return to the environment.
  • the invention may also be used for separating and filtering coal fines from aqueous slurries, or may be used for separating and filtering industrial minerals such as sand, gravel, phosphorite and associated silts and clays for aqueous slurries.
  • the invention may also be used for separating and filtering various mineral products from host aqueous solutions in hydrometallurgical processes.
  • the invention may also be used for water treatment in industrial and municipal water systems in pre-cleaning and/or post cleaning operations for recycling or returning the water to the environment.
  • the invention may also be used for cleaning and treating aqueous slurries for return to the environment.
  • the invention may also be used for processing chemical slurry.
  • the unique characteristics and advantages of the invention are (1) simplicity of design, fabrication, installation, and operation with corresponding cost economy; (2) coupling of low frequency acoustic energy with solids/liquid mixtures and a variety of screen arrangements to effect a continuous process of separation of the solids/liquid fractions, liquid filtration, and screen self-cleaning; (3) stressing and killing effect on certain types of bacteria by low frequency acoustic energy; and (4) wide range of applications involving the separation and filtration of fine particulate solids from liquids, such as but not limited to, pre- and post ⁇ processing/cleaning of municipal industrial water; cleaning/recycling of meat, seafood and produce processing and chiller water; recovery of coal, phosphate and other mineral fines from aqueous slurries, sewage slurry processing, chemical slurry processing and pharmaceutical product processing.
  • FIG. 2 One test of the embodiment of Figs. 2 and 5 was conducted involving the cleaning of poultry chiller water.
  • a batch of 100 gallons was cleaned having a temperature of 40° F (4.5*C) containing 5-10% by volume, particles and lumps of coagulated chicken fat and fine, sinuous, organic particles.
  • a flow rate of 25 gallons/minute was used.
  • a 1 cubic meter gravity tank was mounted to provide a positive pressure head of 0.5 to 1.5 meters.
  • the outlet valves 5 used were manually controlled.
  • the bottom of the vessel body was fitted with a rubber diaphragm 8b with a 10" diameter steel backing disk, the diaphragm and disk was secured by bolting via peripheral, welded steel flanges, the backing disc was welded to a bracket, bolted in turn to the shaft of a piston type pneumatic vibrator (model "FEP", Cleveland Vibrator Company).
  • the vibrator was rated at 35 Hz at 9.5 CFM/60 PSI (.27 m 3 / ⁇ »in at 414 KPa) , no load.
  • the vibrator was acoustically isolated from the rigid vessel body by mounting separately on a 2.5 cm thick rubber damping pad 15 with spring filled bolts 16.
  • the vibrator was operated at 15 Hz with corresponding amplitudes from 2.0 to 0.5 mm measured below and above the cone screen respectively.
  • the processes involved may be considered in two phases.
  • the first phase relates to the process of separation in which the acoustically induced force of acceleration manifests as vibra-agitation (threshold of cavitation) and possible cavitation is the primary factor in the breakdown of surface tension between the solid particles and suspending liquid, e.g. water.
  • the separation of liquid by squeezing may also be a factor.
  • the second phase relates to a complex process of filtration whereby the separated solid particles are filtered out from the liquid fraction which passes through the pore spaces of the 20 micron screen (together with solid particles of sufficient fineness to pass through the mesh spaces, typically less than 15 microns for the test) .
  • the acoustically driven hydraulic pressure waves serve to continuously clean the screen while enhancing the separation/filtration process.
  • This may be most simply described as a process acting on a single point on the screen at a given time (and progressively and cyclicly effecting the entire screen in unit time) by which the negative pressure semiperiod assists the static pressure head in forcing liquid through the mesh spaces of the screen, followed in turn by the positive (back) pressure semiperiod which assists in the dislodging of particles that may become lodged in the screen mesh spaces.
  • this positive pressure semiperiod serves to force the increasing concentration of solids back from the screen surface and further deliquity the solids concentrate by squeezing, which continuously gravitates down the cone screen surface to the funnel exit port with the aid of redundant vibrations.
  • a subsequent test was conducted using an acoustic device rated at 3000 Hertz, with an amplitude of approximately 0.01mm, at a power rating comparable to that of the intial infrasonic run. All other elements of the test, including volume and composition of the batch, were similar as well. Inspection of the screen at the end of the test found it to be partially blinded over about 10% of the surface area. The results of this test (at 3000 Hz and 0.01mm), in comparison with the successful initial test (at 35 Hz and 2.0 to 0.5mm) described above, suggest that the low sonic frequency and greater amplitude resulted in an effective generation of the oscillatory field of flux (acting on and through the screen) .

Abstract

L'invention se rapporte à un système qui sépare et filtre des solides en suspension, en fines particules, contenus dans un liquide. Ce système se compose d'une cuve (1) d'une conception appropriée au traitement d'un mélange de solides/liquides, d'une admission (2a) du mélange, et d'orifices d'évacuation (3, 4) destinés au passage du concentré de liquides et solides traités/filtrés, d'un dispositif pour créer une pression de charge (10, 11) sur le mélange, d'une source d'énergie acoustique fonctionnant dans une gamme sonique, infrasonore ou basse fréquence, et d'un tamis à mailles fines (7a) monté de façon à être couplé hydrauliquement à l'énergie acoustique. L'énergie acoustique transmise par l'onde de compression favorise la séparation des fractions du mélange solides/liquides et crée un champ oscillatoire du flux agissant sur et dans le tamis (7a), dont l'effet obtenu sert à faciliter la séparation continue, la filtration des liquides et l'autonettoyage du tamis. Comme effet secondaire bénéfique, cette énergie acoustique basse fréquence agresse et détruit les bactéries contenues dans le liquide subissant ce traitement.
PCT/US1995/004306 1994-04-07 1995-04-07 Systeme de filtration acoustique/a tamis, autonettoyant, pour separation de solides/liquides WO1995027551A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU22810/95A AU2281095A (en) 1994-04-07 1995-04-07 Self-cleaning acoustic/screen filter system for solid/liquid separation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22403194A 1994-04-07 1994-04-07
US08/224,031 1994-04-07

Publications (1)

Publication Number Publication Date
WO1995027551A1 true WO1995027551A1 (fr) 1995-10-19

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Cited By (6)

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EP2134438A1 (fr) * 2007-03-02 2009-12-23 Smith&Nephew PLC Appareil et procédé de nettoyage d'un filtre par ultrason, décolmatage à contre-courant, lavage et déplacement du filtre pendant la filtration d'échantillons biologiques
US8025152B2 (en) 2005-03-18 2011-09-27 Virdrill As Sieve apparatus and method for use of same
WO2014008192A3 (fr) * 2012-07-01 2014-04-10 J P Love Appareil et procédé d'isolement de composés par vibrations
WO2019195475A3 (fr) * 2018-04-04 2019-11-28 Robbins Jody G Séparation de minéraux par densité relative
CN115624800A (zh) * 2022-10-27 2023-01-20 哈尔滨凯纳科技股份有限公司 一种可远程监控的户外型供水泵站
US11655433B2 (en) 2019-05-29 2023-05-23 Green Drilling Technologies Llc Method, system and product of ultrasonic cleaning of drill cuttings

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US2167236A (en) * 1938-06-17 1939-07-25 Dracco Corp Filtering apparatus
US2626011A (en) * 1951-01-24 1953-01-20 John F Campbell Recirculating dusting system
US3263817A (en) * 1963-05-06 1966-08-02 Pittsburgh Plate Glass Co Vibrating sieve
US3478883A (en) * 1967-04-13 1969-11-18 Amsalco Inc Acoustic filtration apparatus
US3833123A (en) * 1970-02-18 1974-09-03 A Walker Filters
US4136035A (en) * 1977-07-26 1979-01-23 Bogomolov Boris N Apparatus for dehydration of continuously fed flow of suspension
US4900442A (en) * 1988-01-25 1990-02-13 Conn-Weld Industries, Inc. Air seal centrifuge screen basket

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2167236A (en) * 1938-06-17 1939-07-25 Dracco Corp Filtering apparatus
US2626011A (en) * 1951-01-24 1953-01-20 John F Campbell Recirculating dusting system
US3263817A (en) * 1963-05-06 1966-08-02 Pittsburgh Plate Glass Co Vibrating sieve
US3478883A (en) * 1967-04-13 1969-11-18 Amsalco Inc Acoustic filtration apparatus
US3833123A (en) * 1970-02-18 1974-09-03 A Walker Filters
US4136035A (en) * 1977-07-26 1979-01-23 Bogomolov Boris N Apparatus for dehydration of continuously fed flow of suspension
US4900442A (en) * 1988-01-25 1990-02-13 Conn-Weld Industries, Inc. Air seal centrifuge screen basket

Cited By (11)

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