Cheshire Treatment Plant BNR Upgrade
Client: Town of Cheshire, Connecticut
Metcalf & Eddy considered two major levels of nutrient removal for this 3.5-mgd plant. Staff first evaluated the plant to determine the extent of nitrogen removal that could be achieved through low-cost plant modifications. Evaluations were then performed of significant process upgrades to remove nitrogen to meet the goals of the Long Island Sound study.
A wastewater treatment simulator (Hydromantis GPS-X) was used to model the existing treatment plant performance. M&E developed comprehensive one-week sampling programs to assess the treatment performance of the plant and to calibrate the computer simulation model. The calibrated model was then used to evaluate various nutrient removal processes for denitrification.
Separate-stage fixed-film biological aerated filters were selected for this facility based on an economic evaluation of the various alternatives. The biofilter does not actually use aeration, but is anoxic, the first use of this process in Connecticut.
M&E services included:
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