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Board allows quarterly monitoring for NITRIS pilot after year of data showing ~99% nitrogen removal
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Summary
After reviewing 15 samples showing median effluent concentrations under 3 mg/L and roughly 99% total nitrogen removal, the board approved moving monitoring for the NITRIS system at 6 Washington Ave from monthly to quarterly under its provisional use conditions.
The Board of Health voted Nov. 20 to reduce monitoring frequency for the NITRIS (nitrogen-reduction) pilot system at 6 Washington Ave from monthly to quarterly after reviewing lab results presented by Clean 2 Nitro Systems.
Maureen Thomas (Clean 2 Nitro Systems) told the board the system has produced 15 samples at the site and is achieving about 99% total-nitrogen removal with effluent concentrations under 3 milligrams per liter. She said the system’s median results and long-term Cape-and-Islands dataset make the Washington Ave installation "performing better than most of our systems." Under the board’s provisional-use approval, quarterly sampling is consistent with other deployments; if Clean 2 Nitro obtains a general-use approval from MassDEP in the coming years, sampling could be reduced further.
Board members said they were satisfied with the data presented and voted to change the monitoring schedule to quarterly with a plan to re-evaluate if and when the system receives broader regulatory approval. The board stressed the permit condition that operators return with any changed data or performance concerns.
