Author： Tozer Hugh G.
Publisher： Water Environment Federation
ISSN： 1938-6478
Source： Proceedings of the Water Environment Federation, Vol.2007, Iss.2, 2007-01, pp. : 1492-1509
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Abstract
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.
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