초록 ▼

A filter system has a filter media comprised of particles of filter material contained within the lower end of a vessel. Liquid flows into the upper end of the vessel and down through the filter media, thereby removing unwanted contaminants from the liquid. When the accumulated contaminant load in t

A filter system has a filter media comprised of particles of filter material contained within the lower end of a vessel. Liquid flows into the upper end of the vessel and down through the filter media, thereby removing unwanted contaminants from the liquid. When the accumulated contaminant load in the filter media reaches a selected value, the filter media is cleaned of contaminants by vigorously circulating the media within the vessel. This scrubbing action transfers the contaminants from the filter media into the scrub water, and thereby enables the contaminants to be removed from the vessel by discharging the scrub water therefrom. All activity is stopped to enable the media to gravitate back to the bottom of the vessel. The cleaned filter is returned to operation.

대표청구항 ▼

Method of filtering contaminants from a stream of fluid comprising the steps of: (1) placing a first screen means within a vessel; (2) placing a filter media upstream of said first screen means and within said vessel, said filter media being made of a multiplicity of discrete pieces of filter materi

Method of filtering contaminants from a stream of fluid comprising the steps of: (1) placing a first screen means within a vessel; (2) placing a filter media upstream of said first screen means and within said vessel, said filter media being made of a multiplicity of discrete pieces of filter material which substantially will not pass through said first screen means; (3) flowing contaminated liquid into the vessel, through the media, through the first screen means, and away from the vessel, while the contaminant is deposited on the media; (4) cleaning the media of most of the accumulated contaminant while the media predominately remains within the vessel by carrying out the following steps: (a) placing the suction of a pump in communication with the liquid contained within the vessel; (b) placing the discharge of said pump within the vessel in spaced relationship respective to said pump suction; (c) placing a second screen means within said vessel and in spaced relationship respective to said discharge; (d) flowing contaminated liquid contained within said vessel into said pump suction, through said pump discharge, and across said second screen means at a rate to cause substantially all of the liquid and the media to be agitated with great force, thereby scrubbing the media predominately within said vessel, and causing most of the contaminants to be translocated from the media into the liquid; (e) discharging the liquid ladened with contaminants through the second screen means and from the vessel while flowing relative uncontaminated liquid into the vessel until most of the suspended contaminants have been removed from the vessel; (5) reducing the velocity of flow to a value which enables the media to settle into a filter bed; (6) repeating step (3).