Our Projects

Fort Mill, SC

This project consisted of an expansion of the existing Fort Mill Water Pollution Control Plant (WPCP) from 3.0 MGD to 4.5 MGD. An all-new process treatment train was constructed within the former footprint of the solids drying beds. The new train consists of an influent pumping station with a peak flow of 11.25MGD (the current pumps are sized for 12.25MGD) preliminary treatment facility, BNR (biological nutrient removal) basins and MBR (membrane bioreactor) facility as well as associated chemical feed and generator buildings. A smart use of MBR Technology, while not new, membrane bioreactor technology is not seen often in wastewater treatment facilities. The MBR facility is a combination of membrane filtration and biological treatment, using an activated sludge drawn from mixed liquor from the BNR facility. This technology provides enhanced water quality and a reduced footprint. It is also easily expandable, internally, for additional capacity in the future.

Challenging Footprint
The project’s small footprint challenged the team in finding laydown and staging areas. Crowder worked with the owner and design engineer to adjust the plan to allow greater flexibility. Crowder planned the excavation and mass concrete work in the schedule to allow multiple crews to work concurrently, moving in a logical progression from the north to the south end of the site. We closely managed material procurement to provide “just-in-time” deliveries, minimizing on-site materials storage.