Patent ID: 6685835
Filing Date: 2004-02-03
Classification: B01D,C02F,Y02W

Abstract:
A method for filtration of a liquid media, including the filtration of surface water, comprising the steps of:bringing a first stream of the liquid to be filtered into contact with a surface of a filter medium and passing the liquid to be filtered through the filter medium, wherein the first stream has a flow rate (Q); creating a supernatant liquid layer on the surface of the filter medium, and controlling the level of the supernatant liquid layer so that the supernatant liquid layer has a defined thickness (e); organizing a hydraulic path in the supernatant liquid layer, wherein the hydraulic path has a length (L), defined between an inlet and an outlet of the hydraulic path; introducing the first stream into the inlet of the hydraulic path; passing the first stream through the filter medium for a plurality of n cycles; recovering the liquid that has passed through the filter medium for the plurality of n cycles and reinjecting a second stream of the recovered liquid into the supernatant liquid layer at the outlet of the hydraulic path, wherein the second stream has a flow rate (nQ), so that the first stream and the second stream meet and oppose each other in a section of the hydraulic path; and drawing treated liquid off from the hydraulic path after the plurality of n cycles, wherein the treated liquid is drawn off at a flow rate (Q).