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WO2021167469A1 - Systèmes et procédés de filtrage - Google Patents

Systèmes et procédés de filtrage Download PDF

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Publication number
WO2021167469A1
WO2021167469A1 PCT/NO2021/050043 NO2021050043W WO2021167469A1 WO 2021167469 A1 WO2021167469 A1 WO 2021167469A1 NO 2021050043 W NO2021050043 W NO 2021050043W WO 2021167469 A1 WO2021167469 A1 WO 2021167469A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
cleaning
lead screw
filter screen
cleaning member
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/NO2021/050043
Other languages
English (en)
Inventor
Runar Tenfjord
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.)
Tenko AS
Original Assignee
Tenko AS
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 Tenko AS filed Critical Tenko AS
Priority to EP21716242.9A priority Critical patent/EP4106900A1/fr
Publication of WO2021167469A1 publication Critical patent/WO2021167469A1/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
    • 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
    • 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
    • B01D29/31—Self-supporting filtering elements
    • B01D29/35—Self-supporting 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
    • 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
    • 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/682—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a rotary 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B01D29/684—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a translatory movement with respect to the filtering element
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance

Definitions

  • Some methods are known for cleaning the insert without removing it from the filter.
  • One of these methods is to flush the dirt and solid particles utilising the pressure of the process fluid, by opening a flushing valve placed on the end of the filter insert when it is time to clean it, without applying any additional mechanisms.
  • a problem with such methods is that the flushing liquid cannot be equally applied to all the sections of the insert, making the cleaning process less efficient.
  • hydraulic or pneumatic systems are used which are expensive and complicated. Therefore, they may not be preferred in many applications, due to cost, space requirements and operational reliability.
  • the present invention has the objective to provide such improvements, or at least to provide alternatives to existing technology.
  • a filter having a filter housing having a fluid inlet and a fluid outlet; an elongate filter screen arranged in the filter housing between the fluid inlet and the fluid outlet; a cleaning member movable relative to and adjacent the filter screen; a back-wash outlet arranged at an inlet side of the filter screen; wherein the cleaning member is movable axially along a lead screw arranged in the filter housing by means of rotation of the lead screw by a drive motor.
  • the filter screen and the back wash outlet may be arranged on an insert part which is releasably fixed on a receiver filter housing part, the insert part and the receiver filter housing part together making up the filter housing.
  • the filter screen may have a circular cross-section and the cleaning member may be a disc arranged inside the filter screen.
  • the lead screw may be arranged co-axially inside the filter screen.
  • the lead screw may have a helical lead face operable to engage a follower protrusion arranged on the cleaning member and move the cleaning member axially along the lead screw.
  • the lead face may be arranged to reverse the movement of the cleaning member when the cleaning member has reached an end position of a pre-determined cleaning stroke.
  • the follower protrusion may have a first orientation for moving the cleaning member in a first direction along the lead screw and a second orientation for moving the lead screw in a second, opposite direction along the lead screw.
  • the lead screw and/or the cleaning member may be made at least partly of a polymer material, particularly a polymer plastic.
  • the cleaning member may comprise a plurality of fluid inlets or outlets connected to a pressure source via a fluid connection.
  • the fluid inlets or outlets may be distributed around a peripheral part of the cleaning member.
  • the cleaning member may for this purpose be a disc-shaped cleaning member.
  • the fluid inlets or outlets may be directed such as to produce a fluid flow substantially perpendicular to the longitudinal axis of the lead screw.
  • the fluid inlets or outlets may be directed such as to produce a fluid flow which is angled and not perpendicular to the longitudinal axis of the lead screw, such as an upward-directed or downward-directed fluid flow.
  • a method of cleaning a filter by providing a filter and moving a cleaning member and/or a cleaning ring along an elongate filter screen.
  • Figure 1 is a schematic illustration of parts of a filter, including an insert part for assembly with a filter housing part.
  • Figure 2 is a schematic illustration of parts of a filter, including a filter housing part for assembly with an insert part.
  • Figure 3 is a schematic illustration of an assembled filter having an insert part arranged in connection with a filter housing part.
  • Figure 5 illustrates a cleaning member and associated components according to an embodiment.
  • Figure 6 is a schematic of the arrangement of a filter having a cleaning ring.
  • Figure 7 illustrates details of a cleaning ring with nozzles.
  • Figure 3 shows a filter 100 according to an embodiment.
  • Figures 1 and 2 illustrate parts of the filter 100.
  • the filter 100 illustrated in Fig. 3 is assembled from a filter housing part 13 (see Fig. 2) and an insert part 20 (see Fig. 1).
  • the insert part 20 is fixed onto the filter housing part 13 and secured by a connection arrangement, such as a flange 14a,b, as illustrated.
  • the connection arrangement sealingly connects the insert part 20 and the filter housing part 13 to produce a filter housing 10 which forms a closed volume but with inlets and outlets described below, configured to contain liquids therein.
  • the filter 100 has a fluid inlet 11 and a fluid outlet 12. Liquids to be treated by the filter 100 are provided to the inlet 11 and passed through the filter 100 to exit via the outlet 12.
  • the filter may, for example, be a so-called “Bernoulli filter”, known in the art.
  • An elongate filter screen 21 is arranged in the filter housing 10 between the fluid inlet 11 and the fluid outlet 12.
  • the filter screen 21 may, for example, be a meshed plate with a suitable opening width or another shaped body with same mechanical effect such as for example a perforated pipe, selected according to the fluids which are to be filtered.
  • the fluid passing through the filter 100 will thus pass through the filter screen 21 to reach the outlet 12.
  • the filter screen 21 separates the interior volume of the housing 10 into an inlet side 25 of the filter screen 21 and an outlet side 31 of the filter screen 21. Solid particles and unwanted substances will thus be prevented by the filter screen 21 from flowing with the fluid to the outlet side 31 and out of the outlet 12.
  • a back-wash outlet 24 is arranged at the inlet side 25 of the filter screen 21.
  • the function of the back-wash outlet 24 will be described below.
  • a cleaning member 22 is movable relative to and adjacent the filter screen 21 , inside the housing 10.
  • the cleaning member 22 is arranged on the inlet side 25 of the filter screen 21.
  • the cleaning member 22 is movable axially along a lead screw 23 arranged in the filter housing 10 by means of rotation of the lead screw 23 by a drive motor 26.
  • the motor 26 may be any suitable form of drive unit, such as an electric or hydraulic motor.
  • the cleaning member 22 is illustrated both in its uppermost position, indicated as 27’ and being near the top of the insert part 20 adjacent the motor 26, and in its lowermost position, illustrated as 27. It will be understood that this relates to the same cleaning member 22 shown in two different positions, and only one cleaning member 22 is necessary.
  • the cleaning member 22 is arranged to slide axially along one or more axial guide faces arranged to avoid rotation of the cleaning member 22 due to friction the lead face 41 and the protrusion 42.
  • the guide face may be, for example, formed by vertical tracks in the filter screen 21 , such as a recess or protrusion in the screen slidingly cooperating with a corresponding recess or protrusion in the cleaning member 22.
  • longitudinal guide posts 22a, b may be arranged inside the filter screen 21 fitting into corresponding throughbores or recesses in the cleaning member 22.
  • the drive motor 26 may preferably be arranged at an outside of the housing 10.
  • a sealed feed-through for the shaft connecting the motor 26 and the lead screw 23 can ensure that the housing remains fluid-tight.
  • the filter screen 21 is elongate with a circular cross- section, and arranged about the cleaning member 22, which in this embodiment is a disc arranged inside the filter screen 21.
  • Other configurations may, however, be possible, for example could the filter screen 21 have a different cross-section shape which is not circular.
  • the cleaning member 22 may, correspondingly, have a non circular shape.
  • the lead screw 23 is arranged co-axially inside the filter screen 21, and co-axially with the cleaning member 22.
  • the circular cross-sections and co-axial arrangements of these components may provide an advantageous design for compactness and fluid flow properties, however other configurations may also be possible.
  • the protrusion 42 has a first orientation for moving the cleaning member 22 in a first direction along the lead screw 23 and a second orientation for moving the lead screw 23 in a second, opposite direction along the lead screw 23.
  • the lead face can be arranged to change the orientation from the first orientation to the second orientation upon the cleaning member 22 reaching the end position 27.
  • the protrusion 42 may, for example, be a follower blade which is rotatable (“turnable”) such that the lead face 41 can change the blade orientation when the cleaning member 22 reaches the end position 27. The follower blade will then follow the lead face 41 upwardly and back towards its uppermost position.
  • a reversal of the movement of the cleaning member 22 can be effectuated by changing the direction of rotation of the lead screw 23 by means of the motor 26 and/or the transmission between the motor 26 and the lead screw 23.
  • the protrusion 42 may be arranged in a nut fixed to the cleaning member 22 and arranged about the lead screw 23, wherein the nut cooperates with the lead screw 23 to move the cleaning member 22 in the axial direction of the lead screw 23.
  • the nut may have a protrusion in the form of its own helical faces which cooperate with corresponding helical lead face(s) 41 on the lead screw 23.
  • the filter screen 21 will catch solid particles or other undesirable components which are to be filtered out from the processed fluid. Over time, the filter screen 23 will be clogged by the caught particles, and the performance of the filter 100 will usually decrease as a result of this.
  • the cleaning member 22 By moving the cleaning member 22 along the filter screen 23, the collected particles can be released and removed from the screen 23, thereby re-establishing a good filter performance.
  • the movement of the cleaning member 22 can be combined with opening the back-wash outlet 24 to remove liquids dense with solids or other components released during the cleaning cycle.
  • the cleaning cycle may if required be carried out without shutting down the process flow. This can be achieved by flowing the process fluid to the filter via the inlet 11 in the ordinary manner, keeping the outlet 12 open for discharge of cleaned fluid, while opening the back-wash outlet 24 while moving the cleaning member 22 along the filter screen 23. This provides a partial flow of fluid through the back-wash outlet 24 which provides a means for removing the released particles and debris out of the housing 10.
  • the back wash channel 24 is closed.
  • the back-wash outlet 24 may be opened with the cleaning member 22 in its uppermost position (see Fig. 3), and be kept open for a given period of time before the cleaning member 22 is moved downwards. This may allow larger particles to flow directly from the inlet side 25 and out the back-wash outlet 24 before the cleaning member 22 moves downwards, in order that such particles do not have to pass the gap between the cleaning member 22 and the filter screen 21 when the cleaning member 22 has passed the back-wash outlet 24 (i.e. when it is moving downwards in the orientation shown in Fig. 3).
  • valves will be arranged in the overall fluid processing system to provide the desired flow directions. This includes valves controlling the flow through the inlet 11 , outlet 12 and back-wash outlet 24.
  • the cleaning member 22 may be arranged to be in contact with the filter screen 21 during movement along the lead screw 23 for the purpose of cleaning the filter screen 21.
  • the cleaning member 22 may comprise brushes or equivalent means for mechanically cleaning the screen 21.
  • the cleaning member 22 may be arranged to move adjacent but spaced from the filter screen 21 during movement along the lead screw 23. Cleaning of the filter screen 21 can then be effectuated by means of the cleaning member 22 creating pressure differences and local fluid flow conditions in the vicinity of the screen surface which releases or removes solids or other components which may have accumulated on the screen 21. The released solids or components may then be transported away with the fluid flow exiting the back-wash outlet 24.
  • the cleaning member 22 may be movable along the whole length of the filter screen 21 , or alternatively only along a part of the full length of the filter screen 21.
  • the regular flow conditions near the inlet 11 may be such that little solids or other components accumulate on the screen 21 in that area, such that cleaning in this part is less necessary.
  • the fluid connection 52 is provided as a flexible, spiral-shaped pipe arranged about the lead screw 23. It may lead through the housing 10 and to a pump (or equivalent) arranged on the outside of the housing 10, or it may be connected to a pump or pressure source inside the housing 10.
  • the embodiment in Fig. 5 may thus provide further enhanced cleaning effect for the filter by providing an enhanced fluid flow field as the cleaning member 22 moves along the filter screen 21.
  • the embodiment in Fig. 5 is provided with suction through inlets 51 such that particles or dirt is withdrawn out of the inlet side via the inlets 51.
  • the fluid connection 52 may, for example, discharge to the back wash outlet 24.
  • the pressure source for driving the fluid flow through the inlets 51 may also be the back-wash outlet 24 or a back-wash pipe connected thereto, if the pressure in that part is sufficiently low to produce a fluid flow through the fluid connection 52 and inlets 51.
  • the fluid inlets or outlets 51 may be directed such as to produce a fluid flow substantially perpendicular to the longitudinal axis of the lead screw 23.
  • the fluid inlets or outlets 51 may be directed such as to produce a fluid flow which is angled and not perpendicular to the longitudinal axis of the lead screw, such as an upward-directed or downward-directed fluid flow. This may enhance the cleaning effect.
  • the filter 100 comprises a ring 53 with cleaning nozzles 54 connected to a supply hose 55 is arranged in the filter housing 10 in the annulus outside the filter screen 21.
  • the ring 53 is connected by a protrusion 58 to a lead screw 56 making it possible to move the ring 53 along the rotating lead screw when driven by a motor 57.
  • the lead screw 56 may be similar in design as the lead screw 23 described above.
  • the motor 57 may be any suitable type of drive unit, such as an electric or hydraulic motor.
  • rotation of the lead screw 56 may be provided by a drive in the form of a combined drive unit which is operable to move both the cleaning member 22 and the cleaning ring 53.
  • This may, for example, be in the form of a chain drive, belt drive, a mechanical coupling (such as gears) or the like, which is permanently or selectively interconnecting the combined drive unit to both the lead screw 23 and the lead screw 56, and having at least one motor, such as the motor 26 or the motor 57 operatively connected to both lead screws.
  • the drive motor 26 may for example be operable to drive both the lead screw 23 and the lead screw 56.
  • the ring 53 can be used to effect additional cleaning, either individually or in conjunction with the cleaning member 22. This may be useful if, for example, debris at or on the filter screen 21 is hard to remove by use of only the cleaning member 22.
  • the filter 100 may comprise only the cleaning ring 53.
  • the ring 53 may have a plurality of nozzles 54 connected to the supply hose 55.
  • the supply hose 55 may be connected to a fluid source, such as a pump, similarly as described for fluid connection 52 above.
  • a fluid preferably a liquid, may thus be provided via the supply hose 55 to the nozzles 54.
  • the fluid may, for example, be process fluid drawn from upstream or downstream the filter 100, or it may be a dedicated fluid provided for this purpose.
  • the nozzles 54 are directed radially inwardly from the ring 53, towards the screen 21 when the ring 53 is disposed about the screen 21, but the nozzles may, optionally, be arranged with an angle, for example angled slightly upwardly or downwardly. This may enhance the cleaning effect.
  • a filter 100 having only a cleaning ring 53 and no cleaning member 22, or both a cleaning ring 53 and a cleaning member 22, may otherwise be done in the same way as described above in relation to Figs 1-5, and the filter 100 may otherwise be of the same or a similar design as shown in Figs 1-5.
  • Embodiments as described herein thus provide a system and method suitable for automatic or semi-automatic cleaning of a filter system for cleaning of dirt particles generated on the filter insert without opening the filter. Pressure differences and/or mechanical cleaning during the cleaning cycle can cause particles accumulated at the filter screen to be removed and dumped through at least one separate back wash pipe caused by temporarily opening of at least one back-wash valve.
  • a cleaning cycle can be arranged to start automatically as a function of a measured pressure difference between the sensors 10a, b. Such change in pressure can indicate a clogged filter screen, whereby in response a cleaning cycle can be initiated.
  • the back-wash outlet 24 and back-wash valve can be connected to a dumping line to let particles and debris from the filter screen escape.
  • embodiments as described herein can allow the filter to be designed smaller and more location friendly without losing effect.
  • a corresponding computer with software for process control can be utilised for controlling the various valves and other process components, as well as controlling the start of the cleaning cycle.
  • the cleaning ring 53 and/or the cleaning member 22 is a disc connected to a self-reversing helical screw by a follower blade in a nut, enabling the disc to move up and down along the filter surface causing the dirty liquid to be sucked through the back-wash outlet by the opening of the back-wash valve and thereby causing the passage of the dirty liquid only through the back wash outlet by the opening of the back wash valve.
  • the motor 26 and/or 57 may, for example, be an electric, pneumatic or hydraulic motor enabling the rotation of the lead screws 23 and/or 56.
  • the filter screen 21 may be a cylindrical screen wherein the inlet side 25 is defined on the inside of the screen 21 and the outlet side 31 is defined on the outside of the screen 21.
  • the required service space can be reduced due to the compact design of the filter 100. This makes it easier to install the filter 100 at narrow places, for example onboard a ship or other limited spaces.
  • the lead screws 23 and/or 56, the follower protrusion 42 and/or 58, or other parts of the nut mechanism on the cleaning member 22 or cleaning ring 53 can preferable be constructed of thermoplastic materials which are less susceptible to corrosion in water and have higher resistance to chemicals. This can replace expensive materials like titan and duplex stainless steel, while being able to withstand operation in corrosive fluids.
  • the filter screen 21, the lead screws 23 and/or 56, the follower protrusion 42 and/or 58, or the nut mechanism on the cleaning member 22 or cleaning ring 53 can be made of a metal, for example if the filter 100 is required to handle high-temperature fluids.
  • the cleaning process can be accurately controlled due to the possibility of precise rotation control by the motor 26 or 57, for example using an electrical drive.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

Un filtre (100) comprenant : un boîtier de filtre (10) ayant une entrée de fluide (11) et une sortie de fluide (12) ; un tamis filtrant allongé (21) disposé dans le boîtier de filtre (10) entre l'entrée de fluide (11) et la sortie de fluide (12) ; un élément de nettoyage (22) mobile par rapport au tamis filtrant et adjacent à celui-ci (21) ; une sortie de lavage à contre-courant (24) disposé au niveau d'un côté d'entrée (25) du tamis filtrant (21) ; l'élément de nettoyage (22) étant mobile axialement le long d'un arbre fileté (23) disposé dans le boîtier de filtre (10) au moyen de la rotation de l'arbre fileté (23) par un moteur d'entraînement (26).
PCT/NO2021/050043 2020-02-19 2021-02-19 Systèmes et procédés de filtrage Ceased WO2021167469A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21716242.9A EP4106900A1 (fr) 2020-02-19 2021-02-19 Systèmes et procédés de filtrage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20200216 2020-02-19
NO20200216A NO345889B1 (en) 2020-02-19 2020-02-19 Filter systems and methods

Publications (1)

Publication Number Publication Date
WO2021167469A1 true WO2021167469A1 (fr) 2021-08-26

Family

ID=75362653

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2021/050043 Ceased WO2021167469A1 (fr) 2020-02-19 2021-02-19 Systèmes et procédés de filtrage

Country Status (3)

Country Link
EP (1) EP4106900A1 (fr)
NO (1) NO345889B1 (fr)
WO (1) WO2021167469A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
IT202200026211A1 (it) * 2022-12-21 2024-06-21 Sati S R L Dispositivo filtrante con albero di pulizia dotato di movimento roto-traslatorio
CN119143214A (zh) * 2024-11-19 2024-12-17 陕西科技大学 污水处理过滤装置

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CN119143214A (zh) * 2024-11-19 2024-12-17 陕西科技大学 污水处理过滤装置

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