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As part of its five-year comprehensive plan to improve the water quality of its streams, the City of Indianapolis needed to reduce combined sewer overflows at CSO Outfall 039, which discharges to the White River. The project goal was to improve water quality of the river by reducing the amount of solids, floatables, and other pollutants (such as biochemical oxygen demand and bacteria) that enter it.
Donohue completed the design of the new facility, including a 3-million-gallon underground storage/primary treatment tank, a flow control structure, submersible lift station with 7200-gpm duplex pumping system, flow monitoring equipment, tank flushing system, and associated piping to and from the storage tank. Donohue is also providing bank stabilization around the new facilities, an access road, power distribution, and permitting assistance.
The storage/primary treatment tank will have six submersible pumps for conveyance of captured flow back into the interceptor, where it will then be sent to the wastewater treatment plant for complete treatment. The pumps will have grinder heads capable of passing large solids and an access hatch will be provided above the pumps for pump removal while the tanks are full. The tank is designed to be expandable to 10 million gallons and allows for the addition of UV disinfection.
Green aspects of this project are the following:
- Reducing CSO’s and thereby improving the quality of the White River
- Minimizing impact to surrounding area by utilizing a site outside of the White River State Park and constructing a structure that is virtually invisible (underground)
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