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    Aquaponics water use and nutrient cycling in a seawater-cooled controlled environment agriculture system

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    Type
    Conference Paper
    Authors
    Lefers, Ryan cc
    Alam, A.
    Scarlett, F.
    Leiknes, TorOve cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2020-03-18
    Online Publication Date
    2020-03-18
    Print Publication Date
    2020-02
    Embargo End Date
    2021-03-18
    Permanent link to this record
    http://hdl.handle.net/10754/662447
    
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    Abstract
    To demonstrate the water use efficiency and nutrient cycling of an aquaponics system in combination with a seawater based evaporative cooling system, a pilot-scale aquaponics unit was installed and operated for one year inside a controlled environment agriculture building cooled by the evaporation of seawater on the campus of King Abdullah University of Science and Technology in Thuwal, Saudi Arabia. Results collected from the operation included crop water use, water quality parameters, dissolved ion concentrations, outdoor/indoor climate data and crop output. Seawater-based evaporative cooling did not provide adequate indoor temperatures for the cultivation of lettuce during the hot and humid summer season. However, the combined aquaponics with seawater evaporative cooling was effective for fall, winter, and spring cultivation with a mixed crop of lettuce and tomatoes. Opposite to the vegetable production cycle, higher water temperature in the summer favored the production of Sabaki tilapia during the warm summer season rather than the cool winter season. Because of this dichotomy, the system showed promise for management and nutrient balancing on an annual basis rather than on seasonal or daily basis. From a fresh water use perspective, the average daily fresh water use by plants totaled only 4.6 L day-1 m-2 or 19 L kg-1 of crop harvested during the peak winter/spring growing season. Results demonstrated that an aquaponics system in combination with seawater-based evaporative cooling is capable of saving ~90% of fresh water as compared with traditional forms of agriculture in the region.
    Citation
    Lefers, R., Alam, A., Scarlett, F., & Leiknes, T. (2020). Aquaponics water use and nutrient cycling in a seawater-cooled controlled environment agriculture system. Acta Horticulturae, (1271), 395–402. doi:10.17660/actahortic.2020.1271.54
    Publisher
    International Society for Horticultural Science (ISHS)
    DOI
    10.17660/ActaHortic.2020.1271.54
    Additional Links
    https://www.actahort.org/books/1271/1271_54.htm
    ae974a485f413a2113503eed53cd6c53
    10.17660/ActaHortic.2020.1271.54
    Scopus Count
    Collections
    Conference Papers; Biological and Environmental Science and Engineering (BESE) Division; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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