Stiles Vortex and Outfall Pipe


Concrete chamber aims to reduce foam in wastewater effluent

Neel-Schaffer provided design services for this innovative project to add a concrete vortex to one of the two existing outfall lines at the MC Stiles Wastewater Treatment Plant on the east bank of the Mississippi River, about a quarter-mile upstream of popular Mud Island.

Neel-Schaffer designed the structure as a subconsultant to Black & Veatch. Malouf Construction is the contractor for the $6.5 million project, which is scheduled for completion in March 2017.

The project is part of the ongoing consent decree program being managed by Black and Veatch, aimed at improving Memphis wastewater facilities and bringing them into compliance with the Clean Water Act by reducing pollution and odors while allowing for industrial growth.

When completed, the large vortex structure (roughly 24 feet in diameter and 60 feet deep) will reduce the amount of foam in the wastewater effluent.

In addition to building the vortex, the project involves related piping work as one of the existing 84-inch outfall lines will be modified to accommodate the vortex structure and allow the plant to discharge into the Mississippi River at a lower elevation.

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