Title:

Powder Mill Fish Hatchery Recirculating Retrofit Design

Over the last eight months, the UNH CEE Senior Capstone Team #15 coordinated with the Powder Mill NH State Fish Hatchery to provide design alternatives that would treat effluent water from the facility to permissible quality standard limits that are compliant with their National Pollutant Discharge Elimination System (NPDES) permit. The end goal of this project was to develop a sustainable, financially feasible, and environmentally beneficial design by May of 2024. To begin this process, the Team conducted an alternatives analysis for three designs that were approved by the sponsor, Edward J. Malone. The team identified three alternatives that include a partially recirculating aquaponics system, a fully recirculating aquaponics system, and a modular existing infrastructure treatment system. These alternatives were developed with the help of the project sponsor and advisors after identifying the main concerns and parameters of the project scope and overall goal, and ranked using a decision matrix. This analysis concluded that the fully recirculating aquaponic system would be the best alternative design based on the decision matrix criteria due to its ability for efficient nutrient removal, innate benefits to the overall hatchery operation, and elimination of discharge coming from the facility therefore negating the permit limit. With this information compiled and an alternative selected, the project moved forward to design the recirculating aquaponics system, and accomplishing the overall goal, which is detailed with a proposed layout, process flow, and schematic of the hydroponic retrofit system.

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