Fluid stream hydrodynamic separator with high flow bypass

摘要

A system for separating waste materials from a flowing stream of surface water comprises a vertical cylindrical vessel and a vertical structure within the cylindrical vessel. The vertical structure comprises stacked filtering elements and weirs sized to accommodate normal and increased fluid flow for abnormally high surface water flow conditions. The flowing stream containing waste material under normal flow conditions enters the vessel and passes through a filtering wall portion in a lower section of the vertical structure and exits through and effluent pipe. Under higher flow conditions the water flows through an overflow structure mounted on top of a lower cylindrical structure The over flow structure comprises one or more upwardly extending filtering structures and weirs sized to accommodate the excess flow conditions, filter at least a portion of the waste material from said excess flow and direct such excess flow to the effluent pipe.

主权项

1. An improved system for separating waste materials from a flowing stream of surface water, said system comprising a vertical cylindrical vessel and a vertical cylindrical structure located within and spaced from an inner wall of the cylindrical vessel, said system sized to accommodate a projected normal fluid flow and configured so that the flowing stream containing waste material entering the vessel
a. flows into a peripheral space between the inner wall of the cylindrical vessel and the cylindrical structure locate therein, b. the flowing stream passes through a perforated wall portion of the cylindrical structure, and c. exits through and effluent pipe located at a lower portion of a central space enclosed within the cylindrical structure,the improvement comprising an overflow structure mounted within the cylindrical vessel and on a top portion of the cylindrical structure, said over flow structure comprising a combination of two or more upwardly extending filtering structures and two or more weirs sized to receive flow in excess of the projected normal fluid flow and filter at least a portion of the waste material from said excess flow and to direct such excess flow to the effluent pipe wherein:
a. at a first increased flow rate in excess of the projected normal fluid flow, said increased amount of flow passes through a first overflow filtering structure, b. at a second increased flow rate in excess of the first increased flow rate, said second increased amount of flow passes through a second overflow filtering structure, c. at a third increased flow rate in excess of the second increased flow rate, said third increased amount of flow passes over a weir, and d. at a fourth increased flow rate in excess of the third increased flow rate, said fourth increased amount of flow passes over a second weir,such that all of the flow of fluid in excess of the projected normal fluid flow entering the improved system passing through the overflow structure and exits said improved system through the effluent channel.