Abstract:
A disposable rotary drum filter for processing batches of slurry. The device includes an outer housing in which is disposed a rotatable inner drum that is covered with a filter material. Preferably the device is fabricated from a plastic material that is sterilizable. The inner drum is preferably magnetically coupled to an external drive unit, eliminating seals required if it were necessary for a drive shaft to pass through the housing. The inner drum rotates through a slurry. The filtrate outlet is connected to a vacuum source that draws the slurry through the filter material. Solids in the slurry are thus deposited as a filter cake on the outer surface of the filter material, while liquid from the slurry passes through the filter material to be collected as a filtrate. Air drawn into the housing through an inlet passes through the filter material and partially dries the filter cake that has been rotated out of the slurry. As the inner drum rotates, an edge formed on the housing scrapes away a portion of the filter cake, which falls into a filter cake receiver. A simple overflow outlet level limits the slurry level to a defined maximum, and an orifice formed in a fixed plate disposed in a cavity at one end of the inner drum controls pressure conditions within the device to ensure optimal fluid flow. The device is thus useful for solid-liquid separations in batch processing of many types of slurries and can be sterilized, if required.
Abstract:
An assembly for separating solid phase material from a slurry that comprises a pressurized filtration unit including a vessel and filter media. A slurry is fed to the filtration unit where it is separated into a solid phase material and a liquid phase material. The filtration unit has a solid outlet for discharging the solid phase material to a material transport. The material transport moves the solid phase material to a depressurizing chamber that has a lower pressure than the filtration unit. As the solid phase material enters the depressurizing chamber it is exposed to the lower pressure of that chamber. The material transport maintains the pressure difference between the filtration unit and the chamber. Subsequently, the depressurized solid phase material can be conveyed to other equipment for drying or other processing.
Abstract:
A method and apparatus for efficiently separating solids from liquid/solid slurries are disclosed. The slurry to be separated is retainably placed within a container having one or more lift paddles secured within its inner cavity. The container is supported for rotation about an axis and has drive means for slowly rotating the container. As the container rotates, the lift paddles lift a portion of the retained slurry, allowing the liquid portion to fall back into the primary slurry pool to be separated, and lifting coarse solids toward the top of the rotation path of the paddles. The separated solids slide by gravity from the lift paddles as they approach the top of their rotation paths and into a collection tray. A filter that rotates with the container filters fine solids from the liquid portion of the slurry and also deposits the fine solids on the collection tray. The filtered liquids can be readily pumped from or recirculated to the separator. The collection tray reciprocates about a longitudinal axis to move the collected solids from the separator, collection or transport. Continuous flow-through and multiple chamber separation containers are disclosed.
Abstract:
Apparatus for pressing liquid from a liquid containing material is disclosed including a pair of juxtaposed rotary rolls forming a nip, at least one of the rolls being liquid permeable, that roll including an abduction surface extending laterally across the roll so that a portion of the liquid stream pressed out form the liquid containing material passing through the nip runs along the abduction surface, a liquid collector for collecting that portion of pressed out liquid extending laterally across the roll and including a liquid inlet for the pressed out liquid stream, and a return flow protector for preventing the pressed out liquid stream from rewetting the reduced liquid material formed in the nip.
Abstract:
Apparatus is disclosed for dewatering aqueous suspensions including a pair of rotatable rolls forming a nip therebetween, so that the aqueous suspension can pass downwardly through the nip and be dewatered by removing a filtrate from the suspension, and the dewatered suspension can pass downwardly from the nip, at least one of the rolls being liquid permeable, and at least one screen adjacent to the roll and disposed below the nip, the screen is separated from the roll by a predetermined distance and extends along its length, the predetermined distance being a sufficient distance so that a film of filtrate on the roll passes between the roll and upper end of the screen on one side of the screen and the dewatered suspension passes on the other side of the screen so that the filtrate is prevented from contacting the dewatered suspension below the nip.
Abstract:
The invention relates to a device for dewatering and washing fibre stock suspensions with two counter-rotating rolls (2, 3), a stock feed (4, 5) and a stock discharge (6). It is mainly characterized by the headbox (4, 5) at the two rolls (2, 3) being arranged separately in the lower section of the rolls (2, 3), and a discharge screw (6) being foreseen for discharge of the filter mat below the gap between the two rolls (2, 3) and a washing zone (9″, 10″) in the upper part of the rolls (2, 3).
Abstract:
An apparatus for removing sludge is applied to a generally cylindrical filter for use in an electric discharge machine. The filter removes sludge in a process solution used in the electric discharge machine by flowing the process solution from an inner periphery surface to an outer periphery surface and/or the outer periphery surface to the inner periphery surface of the filter. A filter support device holds the filter rotatively with the central axis thereof as the central figure and inclining the central axis by a predetermined angle to the horizontal direction. The filter support device also includes cams for providing rotational driving force and successive impactive force to the filter. A motor provides rotational driving force to the cams. Sludge storage may receive the sludge falling from the filter. The filter support device may further alternate the inclined direction of the filter in a predetermined cycle by rotating with an axis perpendicular to the central axis as the central figure.
Abstract:
An improved method for using replaceable filtration media in a rotatable drum. A plurality of media cartridges are installed on the rotatable drum. As the drum rotates, the media cartridges are alternately submerged and lifted from the water. The constant cycle of flooding, draining, and tumbling of the media provides excellent water filtration.
Abstract:
Apparatus for cleaning a filter cloth in a filtering device with a rotatable drum having an inlet for the liquid to be filtered. The drum has in its circumferential surface openings through which the liquid to be filtered is conducted in a filtering direction out of the drum for filtering through a filter cloth. The cleaning apparatus includes at least one spray nozzle which is adapted to spray cleaning liquid onto a portion of the filter cloth in a direction opposite to the filtering direction. Moreover the apparatus comprises a driving device for providing a reciprocating motion of the spray nozzle. The driving device has a coupling which is adapted to transform the rotary motion of the drum into the reciprocating motion of the spray nozzle, with such a ratio that the rotary motion of the drum and the reciprocating motion of the spray nozzle are out of phase with each other.
Abstract:
A filtration apparatus in which a rotating filter element is concentrically mounted in a hollow conical of cylindrical chamber. The filter element consists of a support and a membrane mounted on the support. Fluid enters the chamber through an inlet port and concentrate leaves the chamber through an outlet port. Filtrate drains through the membrane and support to a channel in the centre of the filter element. Filtration relies upon cross-flow of the fluid across the surface of the rotating filter element. This reduces the tendency of solids in the fluid to block pores of the membrane, thereby maintaining high flux and minimising the requirement for cleaning of the filter.