Self cleaning debris screen for runoff water separation apparatus

摘要

A runoff water vault may be divided into an input chamber which receives runoff water and a second chamber which also separates and stores buoyant and non-buoyant materials separated from the runoff water stream. While the separators in such systems remove particles of different densities than water quite well, they have difficulty in removing neutrally buoyant debris. Screens are added into the water flow stream to catch and remove particles of neutral buoyancy. The screens are mounted in a manner which permits lateral movement of the screen relative to the water flow, such as shaking and/or flexing. Screen movement imparts pressure differential across the screen perforations releasing debris trapped against the screen, so that the debris will fall into an entrainment area and allow increased flow through the screen. The screens may also include one or more turbulator fins for intersecting the water flow and transferring energy to the screen, imparting lateral movement to the screen.

主权项

1. An apparatus for cleaning runoff water comprising:
a unitary vault having a floor, side walls, end walls and a dividing wall defining first and second chambers within said vault; an input conduit for supplying runoff water to said first chamber at a first elevation above said vault floor; a discharge conduit spaced above said bottom at said first elevation and having an inlet for receiving water from said vault above said first elevation, a baffle positioned between said input and said discharge conduits, extending across said first chamber, and having a lower edge at a second elevation below said first elevation and a upper edge at a third elevation above said first elevation and above the elevation of said discharge conduit input, such that transfer of floating contaminates on the input side of said baffle to the discharge side is impeded; a transfer conduit positioned at said first elevation and fed by surface water in said first compartment once said water has risen within said compartment to said first elevation, for delivering such water and floating contaminates into said second compartment at a lower elevation; a screen basket positioned within said second chamber for receiving said water from said transfer conduit into the interior of said basket, wherein said screen basket further includes a screen frame, wherein at least one independent screen is mounted to said screen frame so as to allow for limited movement of said screen in response to water flow against said screen; a return conduit with a first end in said second chamber, positioned at a fourth elevation below said second elevation and outside said screen basket so as to receive water after said water has passed through said screen basket, said return conduit extending into said first chamber at said first elevation wherein as the level of water in said second chamber rises, water from below the surface of the water in said second chamber is transported to said discharge conduit without said floating contaminates and is discharged from said vault; and at least one turbulator fin attached to said screen positioned in said water flow from said transfer conduit to cause said screen to shake or flex when water is flowing.