Newmarket, New Hampshire, is located on the banks of the Lamprey River and feeds into a 6,000-acre tidal estuary called the Great Bay. The Great Bay is home to a diverse ecosystem protected by the Great Bay National Estuarine Research Reserve and the Great Bay National Wildlife Refuge. In 2009, a New Hampshire Department of Environmental Services study of the Great Bay raised water quality concerns related to high levels of total nitrogen, identifying Newmarket Wastewater Treatment Facility as a source.

This discovery brought about an agreement between the EPA and Newmarket that required achieving a TN limit of less than 8 mg/L within five years. Newmarket Environmental Services knew that the aging trickling filter process could not meet the TN removal requirement, so they decided to upgrade with a new facility. This new plant, a four-stage Bardenpho BNR process, would serve the town’s 3,500 residential and commercial users and would be vital to Newmarket meeting their permit. However, to ensure they meet their treatment goals efficiently, an investment in an online instrumentation system to control their process is crucial.

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