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Water 2016, 8(12), 589;

Nutrients and Energy Balance Analysis for a Conceptual Model of a Three Loops off Grid, Aquaponics

Department of Environmental Hydrology and Microbiology, Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion 8499000, Israel
Pacific Aquaculture & Coastal Resources Center, University of Hawaii at Hilo, Hilo, HI 96720, USA
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: M. Haïssam Jijakli
Received: 26 September 2016 / Revised: 27 November 2016 / Accepted: 1 December 2016 / Published: 10 December 2016
(This article belongs to the Special Issue Aquaponics: Toward a Sustainable Water-Based Production System?)
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Food security, specifically in water scarce regions, is an increasing local and global challenge. Finding new ways to increase agricultural production in a sustainable manner is required. The current study suggests a conceptual model to integrate established recirculating aquaculture practices into a near-zero discharge aquaponic system that efficiently utilizes water, excreted nutrients and organic matter for energy. The suggested model allows to significantly extend the planted area and recover energy in the form of biogas to operate the system off-grid. A mass balance model of nitrogen, carbon and energy was established and solved, based on data from the literature. Results demonstrate that a fish standing stock of about 700 kg would produce 3.4 tons of fish annually and enough nutrients to grow about 35 tons of tomatoes per year (chosen as a model plant) and recover sufficient energy (70 kWh/day) to run the system on biogas and use less water. If proven successful, this approach may play a major role in sustainably enhancing food security in rural and water scarce regions. View Full-Text
Keywords: aquaponics; nutrient mass balance; energy balance; biogas aquaponics; nutrient mass balance; energy balance; biogas

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Yogev, U.; Barnes, A.; Gross, A. Nutrients and Energy Balance Analysis for a Conceptual Model of a Three Loops off Grid, Aquaponics. Water 2016, 8, 589.

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