Patent ID: 7160465
Filing Date: 2007-01-09
Classification: B01D,C02F,E03F,Y02W

Abstract:
1. A gravel filter treatment facility, which is buried in the ground, for removing toxic metals from storm water, comprising: (i) a pre-cast concrete fault consisting of: (ii) a grate cover positioned on top of said rectangular shaped assembly of upstanding concrete side walls at the upper end of said pre-cast concrete fault, said grate cover being removable from said pre-cast concrete fault; (iii) a discharge pipe resting on an upper surface of the rectangular shaped base of said pre-cast concrete fault, said discharge pipe passing through one of the four side walls of said pre-cast concrete fault, said discharge pipe having an end which is positioned exterior to said pre-cast concrete fault and connected to a storm drain positioned adjacent said pre-cast concrete fault; (iv) a plurality of porous collection pipes resting on the upper surface of the rectangular shaped base of said pre-cast concrete fault, said porous collection pipes being positioned parallel to one another, each of said porous collection pipes having one end connected to said discharge pipe wherein fluid flow is from said absorption chamber through said porous collection pipes and said discharge pipe into said storm drain; (v) an absorption bed consisting of first, second and third layers of absorbent materials stacked one on top of another within said absorption chamber above said plurality of porous collection pipes, said first, second and third layers of absorbent materials consist of a bottom layer of activated alumina, a middle layer of bone char and a top layer of gravel, said first, second and third layers of absorbent materials removing fine particles of said toxic metals from said storm water to provide clean water to said porous collection pipes, wherein the clean water provided to said porous collection pipes flows through said porous collection pipes and said discharge pipe into said storm drain; and (vi) a paved apron having one end positioned at the top end of a first side wall of said four concrete side walls, said paved apron allowing said storm water to drain into the treatment facility from a concrete pavement, said paved apron being slopped at approximately seven percent to allow said storm water to drain into the absorption chamber of said gravel filter treatment facility, said paved apron having a slope of seven percent and a porous pavement curb mounted on an upper end of said paved apron which functions as a course filter to remove large particles of said toxic metals from said storm water.