Southerly Wastewater Treatment Plant

Kokosing is currently working on two phases (S72 & S73) of the expansion of the Southerly Wastewater Treatment Plant, which is the larger of the City of Columbus, Ohio’s two plants.

In the $52.6-million Secondary Clarifier Additions (S72) portion of the project, which is scheduled for completion in February 2011, Kokosing is performing demolition and replacement work on eight, 200-foot diameter clarifiers, and constructing three additional 200-foot diameter clarifiers and a new return-activated sludge-control facility. The project includes more than 25,000 cubic yards of concrete and 3,000 linear feet of underground and exposed process pipe. This work will increase the plant’s secondary clarification capacity from 255-million to 377-million gallons per day.

The $16.4-million Headworks Part 2 (S73) project, scheduled for completion by April 2010, has Kokosing constructing four 22-foot-diameter grit tanks and four Grit Classifiers – as well as performing the associated piping and pump work. Additions to the plant’s Headworks area, which Kokosing previously constructed, will increase the facility’s capacity from 230-million to 330-million gallons per day.