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how Vortex Drop Structure Works
Drop Structure 1. The wastewater inflow enters the Vortex Channel having a slope and a decreasing radius. The flow is therefore accelerated.

2. The accelerated flow is directed into a vertical shaft of a relatively smaller diameter. The entrance to the Vortex Shaft is through a special Top Cut, profiled to maintain stable, smooth vortex flow for changing flow volumes.

3. The wastewater spirals down along the wall of the shaft. In the center of the spiral is a stable air core. Air from the surrounding atmosphere is dragged down by the falling wastewater, resulting in a slightly negative air pressure above the Vortex Form. This is the mechanism by which odor emissions are eliminated.

4. The spiraling flow continues downward inside the shaft into an Energy-Dissipating Pool. At this point is the greatest energy dissipation and intensive air-flow mixing. The mixing provides a means for flow aeration and hydrogen sulfide oxidation.

5. As the air-flow mix exits the submerged part of the shaft, the remaining flow energy is dissipated through internal friction.

6. Tranquil flow exits the drop structure through its effluent line. The processes of sulfide oxidation continue down the line.

7. Throughout the process, there is no abrasive wear of the drop structure because there is no direct contact between energetic flow and the structure walls.

8. There is practically no corrosion of the drop structure because the corrosive hydrogen sulfides are not emitted and are effectively oxidized.

Download a short movie clip of a working hydraulic model. Modelmovie.mpg (1.3 MB)

The Vortex Flow method and the Vortex Flow InsertTM Assembly are protected by United States Patents 6,419,843 and RE40,407.