The present invention relates to a filter arrangement (1) comprising: a chamber (12) comprising a chamber inlet for unfiltered liquid, a chamber outlet for filtered liquid and a wall arranged to keep the unfiltered liquid and the filtered liquid separated, a filter element (2) having a longitudinal extension arranged inside of said chamber (12), wherein said filter element (2) comprises a semi-permeable filtration wall (22) comprising a folded filter (24) arranged in a zig-zag configuration between an inner perforated cylinder (26) and an outer perforated cylinder (28) and an internally located back- washing arrangement (3). The back-washing arrangement (3) comprises: an elongated and hollow body (32) having a longitudinal extension, which is substantially parallel to the longitudinal extension of the filter element (2), a mechanism configured to drive said body (32) in a rotational and/or an axial movement, a plurality of nozzles (34) arranged in fluid communication with a cavity inside of said body (32), said plurality of nozzles (34) projecting laterally from said body (32) such that a distal end (36) of each of said plurality of nozzles (34) is arranged in close proximity to said inner perforated cylinder (26) and an outlet (320) arranged in fluid communication with said cavity of said elongated and hollow body and wherein said plurality of nozzles (34) are arranged parallel to each other along a straight line on said body (32) such that they all project in the same direction.

The present invention relates to an a multi-cage type ballast water filtering apparatus having a function of automatically controlling simultaneous backwashing, and a method of automatically controlling the simultaneous backwashing. The apparatus includes a body, and filtering units connected to each other to form a packaged structure in the body. Each filtering unit includes a filter filtering ballast water, and an automatic washing unit backwashing the filter. The apparatus further includes a first pressure sensor measuring the pressure in space between the body and the filters, and a second pressure sensor installed on each of some of the filtering units to measure the pressure in the filter of the corresponding filtering unit. When a difference between pressures measured by the first and second pressure sensors exceeds a predetermined range, the automatic washing units of all of the filtering units are simultaneously operated.

A filtration apparatus for installation in a catch basin vault is described. A perforate support plate includes a retractable basket that lies below an opening in the support plate and is positioned below a manhole. Water flowing into the system flows onto the support plate and into the basket, which traps debris. The basket is slidable from an in-use position where the basket is positioned to screen debris flowing into the vault, and a cleanout-position in which the interior of the vault is accessible so that the vault may be cleaned. When the vault needs to be cleaned, the manhole cover is removed to allow workers to have access to the interior of the vault. The workers may clean out the basket, and then slide it out of the way so that they have access to the vault interior.

A filter device having a filter housing (1), having a fluid inlet (11) for unfiltered matter and having a fluid outlet (19) for filtered matter and at least one filter element (7, 9) of one or more parts accommodated in the filter housing (1), which filter element can be cleaned using at least one backwash element (21) in counter current to the direction of filtration, which can be moved by means of a fluid-conveying drive shaft (20) of a rotary drive at the inside (17) of the relevant filter element (7, 9) and which has, at the end adjacent to this inside (17), a gap-shaped passage opening, which is parallel to the axis of rotation (16) of the drive shaft (20) and which opens into a flow chamber connected to the drive shaft (20) in a fluid-conveying manner, is characterized in that the distance between the backwash element (21) and the adjacent assignable filter element (7, 9) can be predetermined by means of an adjustment device (27; 47).

A filter device having a filter housing (1) with a fluid inlet (13) for raw fluid and with a fluid outlet (3) for filtrate and with at least one one-piece or multi-piece filter insert (5, 7) which is received in the filter housing (1) and can be cleaned using at least one backflushing member (21) in counter-current to the filtration direction, which member can, by means of a fluid-guiding driveshaft (23) of a rotary drive (35), be moved along the inner side (19) of the respective filter insert (5, 7) and has, at its end adjacent to this inner side (19), a gap-shaped passage opening (39) that runs parallel to the axis of rotation of the driveshaft (23) and discharges into a flow space (41; 57; 67) fluidically connected to the driveshaft (23), which space at least partially continuously narrows in the direction of the driveshaft (23) in a first plane in which the passage opening (39) lies, is characterized in that, in another second plane transverse to the first plane, the flow space (41; 57; 67) at least partially continuously widens proceeding from the passage opening (39) in the direction of the driveshaft (23).

A device for filtering a stream of water in a channel (2), includes: a wall (6) adapted to be mounted in the channel and including a through-opening, a filter member (10) mounted on the wall opposite the through-opening and including a filter surface projecting relative to the wall, the filter surface having a larger area than would have a flat filter surface fitted in the through-opening, the filter member including retaining members face to face with the filter surface for retaining the bodies that do not pass through the surface, a suction device disposed facing the retaining members, and elements for driving the filter member and/or the suction device in a relative movement of one in relation to the other such that the suction device is successively brought face to face with each retaining member.

The filtering system comprises an inner flow or an outer flow, a shaft, a backwash outlet, a backwash valve, a volume separator rotating disk containing a backwash hole located between the insert and back wash outlet, and a filter cleaning mechanism enabling the cleaning of the dirt particles generated on the filter insert without opening the filter cover. The filtering system contains at least two flow cross-section reducing plates, realizing the speedy passage of the liquid in the insert through the plurality of gaps providing a plurality of reduced flow cross-sections created between the flow cross-section reducing plates and the surface of the insert. A pressure drop is generated during the speedy passage of a liquid through the plurality of gaps. The surface of the insert is cleaned with the passage of the liquid from outside of the insert to the inside of the insert or vice versa.

The invention relates to a filter device, in particular for filtering lubrication, consisting of at least one filter insert (19), in which a respective filter material (27) is received and which is provided with fluid passage points (70) that are delimited by wall parts (63) of the filter insert (19) and with a backflush device (37, 49) that has at least one flush nozzle (49), said flush nozzle being movable along the interior of the respective pairable filter insert (19) by means of a hollow drive shaft (37). The invention is characterized in that at least one pair of flush nozzles (49) is provided for each filter insert (19, 21), said flush nozzles having longitudinal slots (73, 74) which are arranged one over the other in the axial direction of the drive shaft (37), wherein the longitudinal slots have an offset relative to one another which runs transversely to the axial direction such that for adjacent flush nozzles (49), at least one part of the longitudinal slot (73) of one flush nozzle (49) overlaps with at least one of the fluid passage points (70) of the pairable filter insert (19, 21) and at least one part of the longitudinal slot (74) of the other flush nozzle (49) at least partly overlaps with the wall parts (63) which delimit the aforementioned fluid passage point of the filter insert (19, 21).

A self-cleaning filter apparatus includes a filter unit and a plunger unit. The filter unit includes a screen device; and a filter unit housing that houses the screen device. The plunger unit includes a rod end housing coupled to the filter unit housing; a plunger rod with a first plunger rod end positioned within the rod end housing and a second plunger rod end within the filter unit housing; and a plunger assembly secured to the second plunger rod end. During a first filter cleaning event segment, the plunger rod is configured to translate between a nominal position in which the plunger assembly is proximate the first screen device end and a cleaning position in which the plunger assembly is proximate the second screen device end. The plunger rod is configured to dislodge, at least in part, debris from within the screen device during at least the first filter cleaning event segment.

Disclosed herein a method and an apparatus for disinfecting water. The method comprises pumping the water into a top disinfection section comprising a water distributing tray and a first filtration system, filtering a first set of particles from the water, discharging particles from the first set of particles to a sewage from a bottom of a respective filter box of the plurality of filter boxes by pumping a high-pressure stream of water to a back side of the respective strainer, generating filtered water by filtering a second set of particles from the water by passing the water through a bottom disinfection section, the bottom disinfection section comprising a plurality of filtering layers, removing the second set of particles settled in the bottom disinfection section utilizing a vacuum-cleaning system, and reducing microorganisms and ammonia gases in the filtered water by aerating the filtered water comprising exposing the filtered water to a high-pressure stream of air utilizing a plurality of fans.