358 Chestnut Hill Ave, #204B Boston, MA 02135 Office: 617.505.5095 www.CleanWaterOps.com NITROGEN & PHOSPHORUS REMOVAL SUFFIELD, CONNECTICUT (POPULATION 14,000) 2.0 mg/L total-Nitrogen and 0.5 mg/L total-Phosphorus Equipment Cost: $25,000 Annual Savings: $30,000/yr less electricity Case Study: Suffield The dissolved oxygen concentration in the first aerobic zone of the oxidation ditches is kept low enough to solubilize influent BOD without

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