Many municipal and industrial wastewater treatment facilities face new stringent permit limits on phosphorus, with values of 0.2 to 0.05 mg/L being proposed in some watersheds. Most of these plants will need a tertiary treatment process that fits within a small footprint and limited
budget while providing flexibility to meet both current and future limits. The Town of Concord, Massachusetts faced these issues at its 4,540 m3/d (1.2 MGD) wastewater plant. The addition of alum to the secondary clarifiers would not meet the anticipated future phosphorus
limit of 0.1 mg/L or below. Woodard & Curran Inc. evaluated multiple configurations of five processes (CoMag™, Actiflo®, DensaDeg®, DualSand™, membrane biological reactors, or MBR) to help Concord select the best option to provide process flexibility and reliability
on the space-limited site. The peer-reviewed study, which included an extended trial of the CoMag™ process, concluded that CoMag™ was the optimal solution.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.