Project Description

This project expanded the peak wet weather capacity of the City of Fort Smith’s P Street Wastewater Treatment Plant (WWTP) from 55-million gallons per day (MGD) to 83 MGD. The project touched literally every area of the plant and included new pumping, screening, grit removal, aeration, clarification, disinfection, odor control, and sludge handling. One unique aspect of this project was that the existing primary clarifiers were converted to secondary clarifiers. This allowed the plant to eliminate a problematic process and add needed additional secondary clarification capacity at a greatly reduced cost. The project also added a bio-selector and post aeration to the WWTP’s treatment train. Hawkins-Weir Engineers, in association with CDM, worked closely with the Fort Smith Utility Department on every phase of this project including preparing a preliminary engineering report, design, permitting, bidding, and resident engineering services during the construction phase.