Mount Pleasant
WWTP Rehabilitation

The City of Mount Pleasant engaged our team (as KSA) to rehabilitate and expand its existing wastewater treatment plant. The project involves relocating the plant’s discharge 2.5 miles downstream and increasing treatment capacity from 2.91 million gallons per day (MGD) to 5 MGD. This capacity increase will be achieved through the addition of a new treatment train adjacent to the current units.

Key improvements include the construction of a new influent lift station with a splitter box, along with modifications to the existing influent lift station and influent piping. A new influent channel will be built, incorporating two mechanical screens and one manual bypass screen, alongside a new grit removal system.

Treatment capacity will be enhanced with two new aeration basins, blowers, and air piping, as well as two new final clarifiers. The project also includes the replacement of an existing clarifier mechanism, a new filtration basin, and a new chlorine contact chamber. To support treated water discharge, a new effluent lift station and approximately 12,500 LF of 24” effluent force main will be constructed.

Solids handling will be upgraded through the installation of two dewatering presses and a new pump station for waste activated sludge (WAS) and return activated sludge (RAS). The existing chlorination system will be replaced with a new chemical building. Additional improvements encompass site grading, concrete paving, curb and gutter installation, and various piping enhancements.

The project also calls for demolition of outdated infrastructure, including the existing traveling bridge filters and the existing chlorine contact chamber. Electrical upgrades, SCADA improvements, and installation of a backup generator will modernize plant operations. Finally, two existing influent screens will be replaced, and improvements will be made to the sludge storage pump station.

Project Type

Water & Wastewater

Project Sub-Type

Wastewater
Treatment Design