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Class 210/795 - Expanded bed


Subclass of Class 210 - Liquid purification or separation
Definition: Process wherein the fluid causes the bed to expand or fluidize
No. of patents: 47
Last issue date: 12/30/2008


1    
NumberTitleIssue Date
7470372Fluid treatment device
A device for the treatment of an influent with a porous media. The influent passes radially through the porous media and into an internal volume of the device. The treated influent then passes through an open check valve in the internal volume, and then to downstrea...
12/30/2008
7435351Filter apparatus backwash removal device and backwash removal method
A filter media backwash removal method and device for transporting backwash fluid and solids away from re-entering a housing containing circulating filter media. ...
10/14/2008
7309427System for treating liquids
A system for treating wastewater includes a basin to contain wastewater, an aerator provided in the basin to mix the wastewater, and a cover system to cover a surface of the wastewater contained in the basin. The cover system includes a plurality of hollow bodies di...
12/18/2007
7258798Potable water treatment plant and method of maintaining same
A package plant for treating raw water to yield potable water. The package plant includes an inlet for raw water, followed by an ozonator for disinfecting the water. Next is provided an up flow roughing filter including a chemically active layer, on top. A slow sand...
08/21/2007
7223347Apparatus and method for filtering fluids
The present invention provides an apparatus and method for filtering fluids with a compressible filter media within at least a portion of a housing inwardly compressible. ...
05/29/2007
7163621Fluidizable device
A device for the treatment of an influent with a nonbonded media, and when the media becomes spent, the media is fluidized with a backwash fluid. Concentric inner and outer perforated cylinders contain a column of media therebetween. The influent is passed radially ...
01/16/2007
7090771Filtration system underdrain
The invention is directed to a filter underdrain for supporting a filter media between at least two dividers forming at least one cell, which includes at least one porous plate for supporting the filter media for filtering a fluid, the porous plate spanning across a...
08/15/2006
7045067Method and apparatus for increasing filter contaminant loading capacity
The filter contaminant loading capacity of a depth granular media filter is increased by imposing a so-called “back-slip” on the filter bed. At intervals between normal backwashing, a volume of liquid is passed upwardly through the media bed under flow condition...
05/16/2006
6947113Method of fabricating liquid crystal display device
A method of fabricating a liquid crystal display device, includes the steps of (a) coating a material of which an alignment film is composed, on first and second substrates, (b) blowing gas to a surface of the material to dry the material, (c) rubbing the material f...
09/20/2005
6921481Automatic backwash filter system
The invention is directed to an automatic backwash filter system that includes at least one influent port for introducing a fluid to the filter; a plurality of partitions forming a plurality of compartments for holding a filtering media for filtering the fluid; at l...
07/26/2005
6852232Down flow radial flow filter
A method of coacting a fluid with a media, such as granular particles. The media is moved to an upper portion in an upright media container, and held there during a treatment cycle in which the fluid is coacted with the media. When the media requires regeneration, t...
02/08/2005
6322704Radial-flow fluidizable filter
A radial flow fluidized unit (RFFU) (250) employing non-bonded media particles (56) for removing impurities from an influent, that can be backwashed and/or regenerated by fluidizing the media particles (56) to free the impurities therefrom. During a fluid...
11/27/2001
6306310Apparatus for distributing gas and liquid during concurrent gas/liquid backwash in filter underdrain flumes
A concurrent backwash distribution apparatus for a filter having a filter tank and a plurality of underdrain laterals includes a baffle positioned in a common main conduit to define an auxiliary flume between the baffle and the underdrain laterals. The au...
10/23/2001
6143186Device for continuous filtration of liquids
A continuous filter device for liquids has a filter chamber that receives a granular bulk material forming a filter bed. The filter chamber has rectangular inner-walls with a liquid-permeable inlet side and a liquid-permeable outlet side positioned opposi...
11/07/2000
6042729Regeneration of water treatment media
Regeneration of water treatment media is disclosed which includes a water treatment unit having one or more media therein, and which upon initiation of flow of the water, imparts turbulence and abrasion to the treatment medium to automatically cleanse the...
03/28/2000
6015497Filtration system and method for removing biological wastes from aquaculture tanks
A bio-treatment system for removing biological wastes from man-made tanks used to commercially cultivate aquatic animals. The system includes an aqua-culture tank in combination with a filtration tank wherein a screen is attached internally across the cro...
01/18/2000
5989435Method for magnetically filtering wastewaters containing oil-coated mill scale
Electro-magnetic filter apparatus and method of operating to separate and remove oily magnetic solids from wastewaters. The filter apparatus includes a filter assembly having an electro-magnetic coil that encircles a canister. The canister has an interior...
11/23/1999
5750041Method for backwashing water processing systems
In a method for backwashing a water processing system using a buoyant filter layer constrained under wire mesh screen extending across a processing vessel, a water surface level in the processing vessel is lowered below the wire mesh screen. Air is subseq...
05/12/1998
5681472Method and apparatus for separating gaseous bubbles and sand from a liquid flow
A filtering process for and apparatus separating air bubbles and granular filter medium from a filtrate contaminated by the filter medium and bubbles when passing through a filter bed formed by the filter medium for treatment of a suspension or liquid sol...
10/28/1997
5673481Air grid for underdrains and similar systems
Air grid systems for distributing a gas within treatment systems such as underdrain filters and contact clarifiers is disclosed. The air grid is supported from above so that it can be lowered into position and thus modified or repaired. Additionally, this...
10/07/1997
5620607Filtering fluidized bed reactor
A novel process for treating a fluid is disclosed. Generally, the process utilizes a novel fluidized bed reactor and down flow filter. The process includes filling the reactor, and thereafter fluidizing the media bed contained therein. A catalyst is added...
04/15/1997
5296205Multi-bed mass transfer column with mobile packing
A packed mass transfer tower for establishing intimate gas-liquid contact and efficient mass transfer that is less susceptible to gas or liquid channeling, gas surging and uneven distribution of gas or liquid across the cross-sectional area of the tower. ...
03/22/1994
5154824Granular media filtration system with improved backwashing
There is disclosed a granular filtration system having a separator trough with an air deflection baffle of improved shape and operation, preferably combined with an airlift mechanism for cleaning or removing settled granular media particles from the upper...
10/13/1992
5145589Solid-liquid separator and process for washing the same
A solid-liquid separator and a process for washing the same wherein SS (sended solids) caught in space portions of a filter medium in a tank are caused to flow out from the space portions and be suspended while at least part of the filter medium is maint...
09/08/1992
5114595Multiple screen filter and method
A method and apparatus for filtering a fluid through a particulate filter medium and for periodically scrubbing the particulate filter medium of accumulated contaminating material. During the filtration cycle, the particulate filter medium is retained wit...
05/19/1992
5032294Multi-cell gravity filter with central control chamber
A multiple filter, gravity flow, liquid filtering apparatus includes a plurality of adjacent independent filter chambers with common influent and effluent passages surrounding a centrally located effluent control chamber and having provisions for backwash...
07/16/1991
4976873Pulsing portions of a filter cell to extend a filter run
An improved method for operating a down-flow granular medium filter is disclosed which increases the effective filtration time between backwashes. The filter tank cell is divided into a plurality of subcells, each individually adapted and controlled for p...
12/11/1990
4780219System for filtering suspended solids from a liquid
A filtration system and method for the removal of suspended solids from a contaminated liquid in which the contaminated liquid is pumped into the top of a vessel and allowed to flow through a bed of polyethylene particles which acts as a filtering medium....
10/25/1988
4720347Method and apparatus for the filtration of a suspension by a granular filtrating layer
A suspension is filtered by a granular filtrating layer while flowing through the granular filtrating mass as a vertical ascending current. The granular mass is, for the purpose of being washed with air, driven continuously by a compressed air ejector int...
01/19/1988
4719020Process for concentrating a suspension of microscopic particles
According to the invention, the enclosure (1) contains a granular material (4) having a specific mass less, or respectively greater than that of the liquid to be treated. When the liquid is admitted through an upper inlet line (2), a granular bed is forme...
01/12/1988
4693831Rise-rate control of pulsed-bed granular medium filters
A method for controlling the pulsing of a granular medium filter, based on determination of the rise rate of liquid level above the filtration medium. A pulse system is activated whereby sub-fluidizing pulses of a fluid are directed upwardly through the f...
09/15/1987
4668405Downflow filter with high velocity backflush
A method and apparatus for backflushing downflow filters is disclosed which comprises providing a closed container having contiguous, vertically adjacent filter layers. A layer of gravel is provided below the filter layers and is separated from the bottom...
05/26/1987
4643836Radial flow filter having air fluidizing backwash means
A filter for removal of suspended solids from fluids utilizes pressurized air for fluidizing filter media as the latter is exposed to backwashing water. The filter includes a casing having upright walls defining an annular chamber in horizontal cross-sect...
02/17/1987
4627923Apparatus and method of filtering solids from a liquid effluent
There is provided an improvement in a waste effluent filter of the type including a tank, a generally flat fine mesh screen over the lower portion of the tank to define an underdrain cavity below the screen and a filter bed of particulate material having ...
12/09/1986
4608181Water filtration apparatus having upflow buoyant media filter and downflow nonbuoyant media filter
A water filtration system is provided by an upflow filter vessel containing a buoyant filter media in series with a downstream downflow filter vessel containing a nonbuoyant filter media. The buoyant media filter vessel and nonbuoyant media filter vessel ...
08/26/1986
4495074Method and apparatus for filtration using ferromagnetic metal fibers
A filtrating method for removing suspended solids from a liquid by passing the liquid through a layer of filter medium in a magnetic field, the filter medium layer comprising a collection of organic fibers and ferromagnetic metal fibers. Usual suspended s...
01/22/1985
4479880Method and apparatus for deflecting granular material away from the outlet of a filtration bed
A liquid is filtered through a bed 7 of granular material and cleaning of the bed is conducted, when necessary, by upflow of wash water through orifices 9 and air through orifices 12 positioned mid-way between the orifices 9. An overflow 13 defines a free...
10/30/1984
4478726Particulate filter backwash outlet
This invention relates to a backwash outlet assembly for a liquid particulate filter. The outlet is adapted to retain particles which comprise the filter medium while allowing backwash liquid together with impurities to discharge to waste. The outlet comp...
10/23/1984
4446027Buoyant media filter
An upflow, buoyant media filter for industrial and municipal water and wastewater treatment is disclosed. The filter bed is supported in a tank such that there is defined an influent reservoir below the filter bed and an effluent reservoir above the filte...
05/01/1984
4338202Water treatment process and apparatus and device for the distribution of water to be treated into and for the recovery from washing liquid from a water treatment filter apparatus
A device for the distribution of water to be treated into and for the recovery of washing liquid from a water treatment filter apparatus of the type including a tank containing therein a filter material includes a channel coupled to and extending along th...
07/06/1982
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