The Criticality of Coordinating Collection System Improvements with Plant Upgrades

Authors:

  • Jared M. Hartwig, PE, Tony Greiner, PE, CCM, Jim Struve, PE - Hazen and Sawyer
  • Bryan Kohart, PE, Greg Wright, PE - Renewable Water Resources

This presentation will discuss the background, design and construction of the Renewable Water Resources (ReWa) Piedmont Conveyance System Improvements project, specifically on how it relates to the startup and commissioning of ReWa’s new Piedmont Regional Wastewater Treatment Plant (WRRF) and the decommissioning of ReWa’s existing Grove Creek WRRF and Piedmont WRRF. The purpose of this presentation will be to highlight the design considerations of a regional conveyance system when associated with the construction of new and decommissioned facilities, including but not limited to the impacts on schedule, capacity, and system flexibility.

The new Piedmont Regional WRRF, rated at 4 mgd, provides wastewater treatment to the Piedmont, Williamston, Pelzer and West Pelzer communities. Prior to completion of the Piedmont WRRF, each community provided wastewater treatment at separate facilities. The completion of the new Piedmont WRRF allowed for the decommissioning of these existing four (4) facilities; however, system improvements were required to allow conveyance of flows to the new Piedmont Regional WRRF. These improvements included converting the existing Grove Creek WRRF Effluent Pump Station to a raw sewage pump station to transfer flows from the Grove Creek WRRF to the New Piedmont Regional WRRF, and the construction of a new Piedmont Pump Station and associated force main to convey flows from Anderson County previously pumped to and treated at the existing Piedmont WRRF to the new Piedmont Regional WRRF.

Challenges associated with the conversion of the Grove Creek WRRF Effluent Pump Station to a raw sewage pump station included: installation of a new screening structure and influent flow measurement flume; maintaining the existing pump station in continuous operation during construction; and, completing construction in conjunction with the new regional WRRF. The flow from Grove Creek was necessary in order to test the new regional WRRF.

Challenges associated with the design of the new Piedmont Pump Station included: high peak wet weather flows attributed to a satellite collection system; a force main corridor traversing through an active gun range; and, site restrictions caused by the Saluda River and the presence of large quantities of rock on-site.

For more information, please contact the author at jhartwig@hazenandsawyer.com.

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