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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.

Document Type: Research Article


Publication date: 2007-01-01

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