Title:

Rainwater Filtration System for a Remote Island

Star Island, a remote seasonal community off the coast of New Hampshire, currently relies on desalination and imported water to meet drinking water demands. To alleviate pressure on the current systems and reduce costs, this project evaluates rainwater harvesting as a supplemental potable water source. The existing rainwater system is currently offline due to performance and reliability limitations. Three treatment alternatives were developed and compared to the current system: a three-layer multimedia filter, a seven-layer multimedia filter, and a micron filter followed by a granular activated carbon filter. Alternatives were evaluated based on cost, energy usage, operational complexity, and alignment with client goals. Results indicate that the three-layer multimedia filter followed by UV disinfection and chlorine injection provides the best overall balance of treatment performance, cost, and ease of operation. This system was designed and sized to meet seasonal water demands while fitting within the available space. Additional design work included verifying compliance with drinking water standards and developing a seasonal maintenance plan. Finally, the cost per gallon of treated water per season was calculated to assess long-term feasibility compared to existing supply options.

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