Hydrodynamic separator for stormwater treatment
View Patent ↗A method, system, and apparatus directed to an innovative approach for the treatment of stormwater utilizing hydrodynamic separator assembly designed to maximize flow movement for more efficient sediment removal and maximize clearance space within assembly to facilitate cleaning and increase storage capacity of trash, debris, and sediment.
1. A hydrodynamic separator assembly configured for installation within a stormwater drainage infrastructure, wherein the hydrodynamic separator has substantially circular walls with a top, with one or more access openings, a bottom, at least one inlet opening and at least one outlet opening;
wherein said hydrodynamic separator, contains three flow weirs each serving a specific function including a flow splitter with one or more side openings and shelves, an oil-floatables skimmer, and an outlet weir;
wherein said flow splitter is attached to a wall of said hydrodynamic separator, adjacent to said inlet opening, such that water entering via the inlet pipe encounters the said flow splitter and water is directed outward along the walls of the hydrodynamic separator through one or more of the flow splitter's side openings,
wherein directed water travels along said walls toward the oil-floatables skimmer and said directed water is directed toward the center of the hydrodynamic separator and then back toward the flow splitter and continues in two circular motions,
wherein water must flow downward towards an oil-floatables skimmer, said oil-floatables skimmer with bottom positioned below the invert of the outlet pipe and top is positioned above the invert of the outlet pipe so that all water must pass under the oil-floatables skimmer bottom and in doing so trap floatables, said oil-floatables skimmer is attached to walls of said hydrodynamic separator,
wherein said water that travels under said oil-floatables skimmer, must travel back upward and pass over the outlet weir to make it to the outlet opening, said outlet weir with weir shelves and wall is attached to said wall of hydrodynamic separator via mounts, and positioned so that the wall of the outlet weir is disposed across the outlet opening horizontally level so that water must pass over the said weir wall in an even fashion to create laminar flow conditions with minimal velocity to aid the capture of particulates.
2. The hydrodynamic separator assembly of claim 1 , where the interior of the sump chamber is minimally obstructed by internal components and having an open area of greater than 65% the total horizontal area of the structure for the ease of cleaning.
3. The hydrodynamic separator assembly of claim 1 , wherein the flow splitter is comprised of a wall with at least one side opening, two side mounts on the upper portion of said wall and extending beyond said wall and a curved bottom shelf configured to be flush with the invert curve of the inside of the sump chamber below the bottom of an inlet pipe,
wherein the flow splitter assembly of wall, side mounts, and shelf are affixed to a curved bottom mount configured to be flush with the invert curve of the inside of the sump chamber below the bottom of an inlet pipe.
4. The hydrodynamic separator assembly of claim 1 , wherein the oil-floatables skimmer contains side mounts for removable mounting of the oil-floatables skimmer across the entire breadth of the sump chamber;
wherein the oil-floatables skimmer is mounted below the hydrodynamic separator top opening and with the mount beginning above installed inlet and outlet pipe inverts, extending below the bottoms of both the flow splitter and outlet weir shelves;
wherein the top height of the oil-floatables skimmer is above the hydraulic grade line.
5. The hydrodynamic separator assembly of claim 1 , wherein the outlet weir is configured to provide an elongated horizontal plane diversion for treated stormwater to flow over the top;
wherein the outlet weir is comprised of a wall with two side mounts, where the side mounts extend the length of the wall; wherein the wall and side mounts connect seamlessly to a curved weir shelf; wherein said curved weir shelf has one or more outlet weir orifice control holes;
wherein the outlet weir assembly of wall, side mounts, shelf, and orifice control holes are affixed to a curved bottom mount configured to be flush with the invert curve of the inside of the sump chamber below the bottom of an outlet pipe.
6. The hydrodynamic separator assembly of claim 1 , wherein casing of the assembly is selected from the group consisting of: metal, plastic, concrete, fiberglass, composite, and a combination thereof.
7. The hydrodynamic separator assembly of claim 1 , wherein the flow weirs are selected from a group consisting of: non-corrosive materials including: metal, plastic, concrete, fiberglass, composite, and a combination thereof.
8. The hydrodynamic separator assembly of claim 1 , wherein the inlet and outlet pipes is selected from a group consisting of: metal, plastic, concrete, clay, or a combination thereof.
9. The hydrodynamic separator assembly of claim 1 , wherein the overall size of the system has a diameter of 2 feet to 100 feet.
10. The hydrodynamic separator assembly of claim 1 , wherein the inlet and outlet pipes have a diameter of 2 inches to 30 feet.
11. The hydrodynamic separator assembly of claim 1 , wherein the oil-skimmer floatables has a thickness of 0.1 inches to 3 feet.
12. The hydrodynamic separator assembly of claim 1 , wherein the flow weirs are selected from a group consisting of: flow splitters, oil-floatables skimmer, and outlet weirs and a combination thereof.