Process and device for the filtration of liquids polluted by suspended solid bodies
AssigneeItalba, S.p.A.
InventorFranco Achille Mosso
Life of this patent
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Abstract
This invention describes apparatus and process for filtering liquids by employing a vertical cylindrical container divided by an immovable non-porous plate into a separate top and bottom chamber with each chamber containing a bed of filter material. The liquid to be filtered is passed upwardly through the buoyant filter material of the top chamber and then passed in series through the filter material contained in the bottom chamber. Conduit means for passing the liquid from the top chamber to the bottom chamber is located internally of the cylindrical container; passing directly through the said immovable separating plate.
Claims5
A device for the filtration of a liquid containing suspended solids comprising a substantially vertical cylindrical container divided into a top and bottom chamber by a non-porous plate member arranged in a fixed and immovable position transversely of said container, at least the top chamber further divided into an upper and lower section by a porous plate member arranged in a fixed and immovable position transversely of said top chamber, at least the upper portion of the side walls of the said lower section formed into a truncated cone shaped portion along its verticle axis with the smaller diameter end of said truncated cone shaped portion arranged adjacent the said porous fixed plate member, a first filter bed located in said lower section of said top chamber and a second filter bed separately located in said bottom chamber, at least said first filter bed formed of a buoyant filter material having a specific gravity substantially no greater than that of water to allow said filter material during filtration to float and be compacted upwardly against said porous plate member, the said porous plate member being permeable to the passage of said liquid but not to the filter material, inlet means located below the said first filter bed in said top chamber for the passage of liquid to be filtered upwardly through said filter, liquid passage means arranged in series between said top and bottom chambers, said liquid passage means positioned internally of said cylindrical container and passing directly through said non-porous plate member separating said top chamber from said bottom chamber, outlet means for filtered liquid being located at least in said bottom chamber and inlet and outlet means in said top and bottom chamber for the passage and discharge respectively of backwashing fluid.
A process for filtering liquids containing suspended solids in a device having a substantially vertical cylindrical container divided into a top and bottom chamber by a non-porous plate member arranged in a fixed and immovable position transversely of said container, at least the top chamber further divided into an upper and lower section by a porous plate member arranged in a fixed and immovable position transversely of said top chamber, at least the upper portion of the side walls of the said lower section formed into a truncated cone shaped portion along its verticle axis with the smaller diameter end of said truncated cone shaped portion arranged adjacent the said porous fixed plate member, a first filter bed located in said lower section of said top chamber and a second filter bed separately located in said bottom chamber, the process comprising passing the said liquid in an upwardly direction through said first filter bed at a velocity sufficient to compact the filter material into a bed or pack disposed within and occupying said truncated cone shaped chamber, said filter material formed of particles having a specific gravity no greater than the said liquid being filtered, the top smaller diameter end of said truncated cone shaped chamber being permeable to the passage of liquid there through but not to the filter material, passing the effluent in series flow from said first filter bed through fluid conduit means positioned internally of said cylindrical container and passing directly through said non-porous plate member to the other chamber and through the second filter bed contained therein and removing the effluent from said second filter bed as twice filtered liquid, thereafter backwashing each of said filter beds by flowing backwashing liquid in a direction opposite to the direction employed in the filtration step and at a flow rate sufficient to cause the temporary expansion of said first filter bed to result in the separation and removal of filtered solids.
Dependencies are inferred from the claim text.