Contractors in Indianapolis are more than 60% complete with a three-year and roughly $100-million expansion of the city's Southport Advanced Wastewater Treatment Plant to accommodate effluent coming from the city’s ongoing, 25-mile deep tunnel construction program.
A critical part of the city’s plan to mitigate discharge of combined-sewer overflows, upgrades to the 65-acre plant are expected to nearly double the facility’s operating capacity to 250 million gallons per day. The project includes a new headworks, screening and grit removal structure; refurbished settling tanks; eight new 105-ft-dia clarifiers; a new mixed-liquor channel and an ultraviolet structure.