Partitioned separator water treatment system with multiple upflow filters
View Patent ↗An improved 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 a selection from a collection of upflow filters, including a hydrocarbon-absorbing boom. 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 baffle box drain system, comprised of a structure defined by a floor, walls and top inserted in the flow stream of a drain, the drain possessing an inflow end and an outflow end,
the structure divided into a plurality of separation chambers, each chamber with an open top, the chamber tops below or equal to the level of the inflow end and outflow end of the structure,
the drain and structure situated such that water enters the structure at the inflow end and flows over the tops of the plurality of chambers allowing sediment and solid pollutants to be trapped in the chambers,
the last chamber at the outflow end possessing a baffle and a horizontal upflow filter,
the baffle a solid vertical barrier across the structure with a bottom opening leading into the last chamber and a top that extends in height above the tops of the other chambers, said height selected to force water flow below the baffle without restricting the flow rate of water through the outflow end during higher flows,
the baffle attached in its middle to the upflow filter, the length of the baffle extending below the attachment point to the upflow filter selected to balance the flow rate of drain water into the last chamber through the bottom opening with the flow rate of water through the upflow filter,
the upflow filter situated such that water rising from the last chamber leaves through the outflow end of the drain due to water pressure formed in the last chamber, said water forced up through the upflow filter, said upflow filter designed to remove fine and dissolved pollutants from the drain water,
the upflow filter comprised of one or more compartments containing a material capable of removing contaminants from passing water,
the top of said upflow filters defined by one or more fixed or hinged doors that can be opened to remove or insert said filter material.
2. A baffle box drain system as in claim 1 , where the upflow filter contains a pleated paper membrane material formed into a plurality of individual cartridges, the cartridges arranged side-by-side in the upflow media filter, maximizing surface area by extending vertically downward into said last chamber.
3. A baffle box drain system as in claim 1 , where the upflow filter is comprised of one or more disc filters, the disc filters arranged side-by-side in the upflow media filter, maximizing surface area.
4. A baffle box drain system as in claim 1 , where the upflow filter is comprised of one or more granular filter media.
5. A baffle box drain system as in claim 4 , where the upflow filter contains a combination of pleated paper membrane material formed into a plurality of individual cartridges and a bed of granular media, said pleated paper membrane material formed into a plurality of individual cartridges placed on the side of the upflow filter where water initially enters said filter, to protect the granular filter media, placed above, from clogging caused by fine particulates.
6. A baffle box drain system as in claim 1 , where the upflow filter is comprised of one or more smaller upflow filters positioned side by side and end to end to form an up flow filter array.
7. A baffle box drain system as in claim 1 , where the upflow filter is comprised of a channel flow filter, the channel flow filter comprised of bundled, porous tubes stacked side by side forming a honeycomb-shaped structure as seen from the ends of said bundles, said porous tubes plugged in an alternate fashion on the influent end and plugged in an opposite alternate fashion on the effluent end, such that water entering the tubes on the influent end has to pass through the porous walls of the tubes to the adjacent tubes that are open on the effluent end.