Life Cycle Assessment of a Commercial-Scale Freshwater Aquaponic System

Abstract Life cycle assessment was used to evaluate environmental impacts of simultaneous fish and plant production through the aquaculture practice of aquaponics. In aquaponics, hydroponic plant production replaces the conventional water treatment processes of microbial nitrification and water exchanges required in recirculating aquaculture systems (RAS) to maintain water quality. The system expansion method was used to assess potential avoided burdens from coproduction of recovered solids, plant production, and water treatment. Results indicated that electricity and feed were the main contributing factors to environmental impact. Impact assessment results were highly sensitive to changes in electricity inputs, suggesting that a small reduction in electricity could contribute to a correspondingly large change in the environmental impact. Avoided burdens associated with coproducts contributed to a moderate reduction in environmental impact compared to reducing total electricity inputs or sourcing electric...

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