Liquid purification or separation – Structural installation – Flume stream type
Reexamination Certificate
1999-11-16
2001-02-20
Savage, Matthew O. (Department: 1723)
Liquid purification or separation
Structural installation
Flume stream type
C210S259000, C210S304000, C210S305000, C210S317000, C210S320000, C210S335000, C210S484000, C210S521000, C210S924000
Reexamination Certificate
active
06190545
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to the treatment of water which passes into the piping of a drainage system by way of a storm drain and relates, more particularly, to filtration systems through which drainwater is routed for purposes of filtering contaminants from the drainwater.
It is known that residue from oil and gasoline spills at service stations, parking lots or similar sites commonly remains at the site of the spill until it is washed away with water by way of a rainfall or a hose-cleaning operation. Of, course, as the residue and/or spilled material is washed to a drain, it is likely to be carried to and mixed with the water supply (e.g. lakes, etc.) from which drinkable water is taken. Similar problems and environmental concerns arise at alternative sites, such as in a leaching pool designed as a detention basin, for filtering, for example, wastewater, stormwater, free-phased organics, petroleum spills, nonpoint source discharge water, vehicle washdown wastewater, wastewater from secondary containment dikes, excavation and construction sites, underground storage tank removals, emergency response conditions, remote wash down areas, and captured water at stream crossings for timber cutting sites.
It is an object of the present invention to provide a new and improved means for filtering water which flows into a storm drain.
Another object of the present invention is to provide a new and improved drainwater treatment system which is positionable within a horizontal flow passage of a storm drain system and which provides an improvement upon the structure and filtration capabilities of the drainwater treatment systems of the prior art.
Still another object of the present invention is to provide such a treatment system which provides a relatively high exposure of drainwater to filter medium as drainwater flows through the treatment system.
Yet another object of the present invention is to provide such a system which is uncomplicated in construction and effective in operation.
SUMMARY OF THE INVENTION
This invention resides in a drainwater treatment system positionable within a horizontal flow passage of a drainage system having an upstream pipe portion having an outlet through which drainwater enters the horizontal flow passage and a downstream pipe portion having an inlet through which drainwater exits the horizontal flow passage.
The treatment system includes a partition supported within the horizontal flow passage between the upstream and downstream pipe portions for dividing the horizontal flow passage into an upstream chamber into which drainwater flows from the outlet of the upstream pipe portion and a downstream chamber from which drainwater flows into the inlet of the downstream pipe portion. In addition, the partition has an upper edge and an opening adjacent the upper edge through which the interior of the upstream chamber communicates with the interior of the downstream chamber. Flow-channeling means including a mid-panel is supported within the upstream chamber for dividing the interior of the upstream chamber into an upper section and a lower section and which is disposed beneath the elevation of the outlet of the upstream pipe portion and the partition opening so that the drainwater which enters the upstream chamber from the outlet of the upstream pipe portion flows directly into the upper section of the upstream chamber. The mid-panel includes a first opening through which water is permitted to flow from the upper section to the lower section and also includes a second opening. Furthermore, a conduit is joined between the mid-panel and the partition which permits communication between the second opening of the mid-panel and the partition opening for conducting drainwater from the lower section of the upstream chamber to the downstream section when the level of the drainwater collected within the upstream compartment reaches the elevation of the partition opening so that the drainwater which enters the upper section from the upstream pipe portion and flows into the lower section by way of the flow-channeling means is decelerated to flow conditions at which debris and suspended solids are permitted to separate and settle from the drainwater before being conducted from the lower section and into the downstream chamber through the conduit. The system also includes at least one filter supported within the downstream chamber so that drainwater which flows into the downstream chamber from the upstream chamber and toward the inlet of the downstream pipe portion flows through the at least one filter before reaching the inlet of the downstream pipe portion.
REFERENCES:
patent: 1738521 (1929-12-01), Bomhoff
patent: 4689145 (1987-08-01), Mathews et al.
patent: 4906381 (1990-03-01), Barbaro
patent: 5223154 (1993-06-01), MacPherson, Jr. et al.
patent: 5507944 (1996-04-01), Freidland et al.
patent: 5511904 (1996-04-01), Van Egmond
patent: 5718015 (1998-02-01), Rohrbacher
patent: 5788849 (1998-08-01), Hutter, Jr. et al.
patent: 5820762 (1998-10-01), Bamer et al.
Ad. literature—“Hydro-Kleen Filter Ststems”, Bamcon Engineering Inc., Castro Valley, CA.
Ad. literature—Unit “H”, Suntree Isles, Inc., Cape Canaveral, FL.
McKee Michael E.
Remedial Solutions, Inc.
Savage Matthew O.
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