Partitioned Separator Water Treatment System with Upflow Filter
A system designed to control and filter runoff water in storm drains is presented. Drain water frequently carries trash, organic matter, suspended solids, hydrocarbons, metals, nutrients and bacteria collected from streets and parking lots into a storm drain inlet, which enters storm water drain pipe systems. The present invention supplies a series of baffle boxes inserted in the drain water stream with a final box possessing an upflow filter comprising filtration media. The system can also support a storm flow bypass that directs high-flow storm runoff water directly to the outlet to protect the filter system.
1 . A partitioned separator water treatment system, comprised of a box configured for insertion into a flow stream, the box possessing a ceiling, a floor, two lateral walls, an inflow endwall comprising an inflow opening and an outflow endwall comprising an outflow opening,
the inflow end of the box possessing at least one separation chamber weir dividing the box into a plurality of separation chambers, the at least one separation chamber weir in sealing connection with the floor and two lateral walls of the box, but not the ceiling of the box, and having a top below a bottom level of the inflow opening,
the box and the at least one separation chamber weir situated such that water entering the inflow opening is capable of filling the plurality of separation chambers and flowing over the top(s) of the at least one separation chamber weir, allowing sediment and solid pollutants to be trapped in the plurality of separation chambers,
the outflow end of the box possessing a bypass weir in sealing connection with an upflow filter assembly that comprises a media filtration unit,
the bypass weir: i. in sealing connection with the lateral walls of the box, but not the floor or the ceiling of the box, ii. having a top that is above the top of the at least one separation chamber weir, and iii. having a bottom that is above the floor of the box, such that water entering the inflow opening is capable of flowing toward the outflow opening below the bypass weir during low flow periods and above and below the bypass weir during high flow periods,
the media filtration unit in sealing connection with the lateral walls of the box and possessing: i. a top panel that is water permeable and positioned below a bottom level of the outflow opening, ii. a bottom panel that is water permeable, iii. side walls that are water impermeable, and iv. filtration media between the top panel, the bottom panel, and within the side walls, such that water is permitted to flow from an area in the box below the media filtration unit, upward to the outflow opening only by passing through the filtration media,
the filtration media capable of removing, from water that flows therethrough, fine sediments and particulates and dissolved pollutants.
2 . The partitioned separator water treatment system of claim 1 , further comprising a hydrocarbon filtration unit mounted on a side of the bypass weir that faces the inflow endwall.
3 . The partitioned separator water treatment system of claim 1 , further comprising a bypass filtration basket mounted on a side of the bypass weir that faces the outflow endwall.
4 . The partitioned separator water treatment system of claim 1 , wherein the filtration media is a least one inorganic media selected from the group consisting of a zeolite, an expanded aggregate, a lava rock, an oxide-coated inert material, an alumina, an activated carbon, a perlite, a stonewool, a rockwool, and a pumice.
5 . The partitioned separator water treatment system of claim 1 , wherein the inflow opening is on one or more of the three walls on the inflow side of the bypass weir.
6 . The partitioned separator water treatment system of claim 1 , wherein the outflow opening is on one or more of the three walls on the outflow side of the bypass weir.