Trench drain filter assembly
View Patent ↗An improved trench drain filter and modular system therefor for intercepting and treating run off water in a trench drain before discharge into a drainage system. The filter elements include a perforated pipe covered with one or more layers of geotextile material, which is, in turn, covered with a permeable fabric membrane. In a preferred embodiment a pouch containing an absorbent agent is disposed within the pipe upstream of the discharge point, and in another embodiment a multi-filter modular unit is provided, the unit including a plurality of filter elements disposed in an enclosure having fluid flow control baffles to direct fluid to and through the filter elements.
1. A trench drain filter apparatus, comprising:
a tubular support structure having a hollow interior and provided with a plurality of openings along its length to permit the flow of fluid into the hollow interior; a connector attached to said tubular support structure and including an overflow bypass port, said connector placing said tubular support structure and said overflow bypass into fluid communication;
an elongate porous bag disposed within the hollow interior of said support structure; and
an absorbent material disposed within said elongate porous bag.
2. The apparatus of claims 1 , further including a geotextile covering disposed around and substantially covering said support structure.
3. The apparatus of claim 2 , wherein the geotextile covering has a porosity of between 70 gpm/sq ft and 150 gpm/sq ft.
4. The apparatus of claim 2 , further including open fabric impregnated with a thermoset resin disposed around and substantially surrounding said geotextile covering.
5. The apparatus of claim 1 , wherein the absorbent material is a hydrocarbon polymer based filer medium.
6. The apparatus of claim 1 , wherein the absorbent material is an amorphous alumina silicate.
7. The apparatus of claim 1 , wherein the tube is a plastic pipe.
8. The apparatus of claim 1 , wherein the elongate porous bag is formed of woven polyethylene.
9. The apparatus of claim 1 , further including an extension disposed from said connector and sized to be received by a trench drain discharge pipe.