摘要:
A filter includes a filter chamber of adjustable volume. The filter chamber encloses a compactable filter medium through which fluid to be filtered may flow. The filter medium includes a plurality of filter particles. A filter particle has an initial shape and is deformable upon application of a deforming force, being capable of substantially regaining its initial shape upon removal of the deforming force. The porosity of the filter medium is adjustable by adjusting the volume of the filter chamber so as adjust the compaction of the filter medium.
摘要:
A radial-flow filter (120) employing nonbonded granular particles (56) for filtering impurities from an influent, and that can be backwashed by fluidizing the granular particles (56) to free the impurities therefrom. During a backwashing operation, a backwash liquid applies an upwardly-directed drag force on an upper portion of the granular particles (56) to lift the same into a backwash chamber (62) for fluidization. Once the top portion of the granular particles (56) of the filtration bed is fluidized, the backwash liquid applies an upward force on a subsequent portion of the granular bed, thereby fluidizing the granular particles (56) in the backwash chamber (62). Subsequent sections of the granular bed are fluidized in a similar manner to thereby completely clean the granular particles (56). After the backwash operation, the granular particles (56) fall back to the filtration chamber (156) and form a filter bed for carrying out a filtration operation.
摘要:
A filtering method and apparatus in which a chamber l0 has an inlet l8 and a filtrate outlet l6. A perforated base l4 is mounted within the chamber and a perforated piston 26 is spaced therefrom, the base and the piston extending across the chamber between the inlet and outlet. A mass 34 of fibres fill the space 46 between the base and the piston. Means 24 are provided to move the piston away from and towards the base, to enlarge and reduce the size of the space and a backwash of fluid through the space 46 can take place in a direction away from the base and towards the inlet when the piston is moved back and forth during the backwash operation.
摘要:
A method of filtering fine solids from a fluid (gas or liquid) flowing upwardly through a chamber containing a semifluidized bed of discrete filter particles. During a filtering operation, the upper or packed section of the bed is immobilized by a porous retainer at the top of the chamber and, as the operation proceeds, the packed bed section gradually expands downwardly, and the fluidized bed section below it progressively decreases in size, thereby extending the duration of the filtration run and yielding a more uniform distribution of solids throughout the filter medium.
摘要:
Apparatus for inhibiting fines carryover in the form of a settlement tank comprising: a filter which divides the tank into upper and lower portions; a fluid inlet in the lower portion for admitting into the tank a fluid with entrained solids; and a fluid outlet in the upper portion through which filtered fluid can leave the tank. The filter comprises filter media supported on a permeable wall, the wall including a filter media outlet which is normally closed, and opening means for opening the filter media outlet to allow the filter media to discharge into the lower portion of the tank. The invention also relates to a method of refilling the filter with filter media.
摘要:
The invention relates to a device and a method for the purification of effluent. The device comprises a filter container (1A), containing a filter medium (2a, 2b), through which the contaminated effluent (3) is run in a direction (filtration direction), thus depositing dirt particles on the filter medium (2a, 2b). The risk of filter blocking is present in such filtration devices, especially at low filtration speeds. It is known that filter blockages can be avoided by the addition of flocculating agents or by increasing the filtration speed. The addition of flocculating agents makes the filter process more expensive and increasing the filtration speed reduces the quality of the filtrate. According to the invention, a high filtrate quality may be guaranteed without addition of flocculating agents with said device, whereby the cross-sectional area of the filter container (filtration area) running perpendicular to the filtration direction, expands in the filtering direction, whereupon the speed of the effluent being run through (filtration speed) continually reduces along the filtration direction.
摘要:
The invention relates to apparatus (1) for filtering a fluid having a body (2) and a filter medium (3) comprising a mass of compressible fibres which is compressed by a device (4) which in the embodiment is an inflatable rubber diaphragm. There is an inlet (11) for liquid to be filtered and an outlet (18) for filtrate, the liquid passing through a perforated plate (8) to the medium (3). The filter medium is backwashed by expanding the medium (3) by relaxing the device (4) as by deflating it and passing liquid through the outlet (18) through the media and hence to the inlet (11).
摘要:
A method of filtering fine solids from a fluid (gas or liquid) flowing upwardly through a chamber containing a semifluidized bed of discrete filter particles. During a filtering operation, the upper or packed section of the bed is immobilized by a porous retainer at the top of the chamber and, as the operation proceeds, the packed bed section gradually expands downwardly, and the fluidized bed section below it progressively decreases in size, thereby extending the duration of the filtration run and yielding a more uniform distribution of solids throughout the filter medium.
摘要:
Contaminated liquid is passed through a resilient, lumpy porous or cellular filtering medium (17) anti-gravitationally and under pressure; the porosity of the filtering medium (17) is controlled by the pressure of the contaminated liquid. In the course of regeneration of the filtering medium (17), simultaneously and continuously contaminated liquid and compressed air are passed upwardly through filtering medium (17), the air pressure being approximately equal to that of the contaminated liquid. In this way, contaminants accumulated in the filtering medium (17) are removed by means of the compressed air and the throughflowing contaminated liquid. The apparatus includes a closed filter tank (13), perforated sheets (14, 15. 16) arranged perpendicularly to the direction of flow of the contaminated liquid in the closed filter tank (13) and containing therebetween a resilient, lumpy, porous or cellular filtering medium (17). At the bottom of the filter tank (13) there is an inlet (4a) for contaminated liquid and an inlet (7a) for compressed air. At the top of the filter tank (13) there is an outlet which is bifurcated to provide a discharge (6a) for filtered liquid and one (5a) for pre-filtrate which may be recycled to the inlet (4a).
摘要:
Device (100) and method for purifying waste water from a car wash (190) for vehicles (191), which device (100) comprises a reservoir (210) that comprises a purification chamber (211). For preventing blockage of spray nozzles (193) of the carwash (190) the purification chamber (211) of the device (100) comprises carrier particles (290) having a density of less than 1 kg/litre; and the device (100) comprises a separator (220) for separating water passed along the carrier particles (290) from the carrier particles (290). A biofilm is formed on the carrier particles (290) that catches particles from the waste water when the waste water produced by the carwash (190) is passed along the carrier particles (290).