Patent ID: 6533941
Filing Date: 2003-03-18
Classification: B01D,E03F

Abstract:
A flow through drain filter assembly for a stormwater or wastewater catch basin forming a sewer system inlet and having a gravity flow basin outlet drain, said filter assembly being formed for excluding floating trash and capturing sediment, liquid hydrocarbons, and free metal ions washed into said sewer system inlet by stormwater or wastewater, said filter assembly comprisingat least four concentric spaced apart screens disposed in said assembly and arranged to filter water flowing to said outlet, said assembly including a water intake trash exclusion screen and a water exit screen and first and second middle screens, said assembly including deionizing resin beads disposed between said water exit screen and said second middle screen, and particulate filter material which is hydrophobic and a liquid hydrocarbon absorber disposed between said first and second middle screens, whereby water flowing into said sewer system inlet passes through said filter assembly and trash is separated from said water by said trash exclusion screen and suspended sediment washed thereinto therewith is precipitated to the bottom of said filter between said trash exclusion screen and said first middle screen, and liquid hydrocarbons suspended in said water are absorbed by contact with said particulate matter disposed between said first and second middle screens, and free ions are deionized by contact with said resin beads disposed between said second middle and said exit screens by the outflow movement of said water in said basin through said screens to said outlet whereby trash, sediment, hydrocarbons, and free ions are thereby separated, precipitated, absorbed and deionized sequentially by said assembly and its ingredients and prevented from flowing through said outlet and into said sewer system.