Liquid purification or separation – Flow – fluid pressure or material level – responsive – Prefilt deverting to drain by prefilt accumulation
Reexamination Certificate
1999-11-16
2001-09-11
Savage, Matthew O. (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Prefilt deverting to drain by prefilt accumulation
C210S164000, C210S253000, C210S254000, C210S259000, C210S299000, C210S306000, C210S317000, C210S335000, C210S344000, C210S502100
Reexamination Certificate
active
06287459
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 known that treatment systems can be installed within a drainage system for filtering drainwater which enters the drainage system by way of a storm drain so that the water which eventually makes its way through the piping of the drain is filtered of pollutants or other contaminants. However, it would be desirable to provide a drainwater treatment system whose structure and filtration capabilities improves upon those of the drainwater treatment systems of the prior art.
Accordingly, it is an object of the present invention to provide a new and improved drainwater treatment system for installation within a drainage system for filtering contaminants from drainwater flowing therethrough.
Another object of the present invention is to provide such a treatment system which is well-suited for use in a vertical passageway of a drainage system wherein water flows into the vertical passageway through a surface opening of the drainage system.
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 treatment system which permits drainwater to bypass the filter medium during storm flow conditions.
A further 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 the flow passage of a drainage system having a surface opening through which drainwater enters the drainage system and a vertical passageway which extends downwardly from the surface opening.
The treatment system includes a catch basin positionable within the vertical passageway of the drainage system for accepting all of the drainwater expected to flow downwardly into the vertical passageway from the surface opening. The catch basin has an upper edge across which drainwater is permitted to flow from the catch basin when the drainwater collected within the catch basin reaches the level of the upper edge. The treatment system also includes a filter-supporting section joined to the catch basin for accepting drainwater which flows out of the catch basin across the upper edge thereof so that the drainwater accepted by the filter-supporting section flows downwardly therethrough. A first filter is supported within the filter-supporting section for filtering contaminants from the drainwater which flows downwardly through the filter-supporting section, and a second filter is supported within the filter-supporting section for filtering additional contaminants from the drainwater wherein the first and second filters are supported by the filter-supporting section in registry with the expected flow path of drainwater flowing downwardly through the filter-supporting section. Associated with the catch basin and the filter-supporting section are means providing an overflow through which drainwater is permitted to bypass the first and second filters and continue to flow along the drainage system when the flow rate of drainwater into the system exceeds the rate at which drainwater is permitted to flow downwardly through the first and second filters.
REFERENCES:
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: 5788849 (1998-08-01), Hutter, Jr. et al.
patent: 5820762 (1998-10-01), Bamer et al.
Ad. literture—“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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