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Open AccessArticle

The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce

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Biobased Chemistry & Technology, Wageningen University, P.O. Box 17, Wageningen 6700 AA, The Netherlands
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Institute for Natural Resource Sciences Gruental, ZHAW Zurich University of Applied Sciences, Waedenswil CH-8820, Switzerland
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Integrated and Urban Plant Pathology Laboratory, Université de Liège, Avenue Maréchal Juin 13, Gembloux 5030, Belgium
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IGB, Ecophysiology and Aquaculture, Müggelseedamm 310, Berlin 12587, Germany
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Authors to whom correspondence should be addressed.
Academic Editor: Mike McLaughlin
Agronomy 2016, 6(2), 37; https://doi.org/10.3390/agronomy6020037
Received: 12 May 2016 / Revised: 9 June 2016 / Accepted: 14 June 2016 / Published: 21 June 2016
The mobilization of nutrients from fish sludge (i.e., feces and uneaten feed) plays a key role in optimizing the resource utilization and thus in improving the sustainability of aquaponic systems. While several studies have documented the aerobic and anaerobic digestion performance of aquaculture sludge, the impact of the digestate on plant growth has yet to be understood. The present study examines the impact of either an aerobic or an anaerobic digestion effluent on lettuce plant growth, by enriching a mixture of aquaculture and tap water with supernatants from both aerobic and anaerobic batch reactors. The lettuce plants grown in the hydroponic system supplied with supernatant from an anaerobic reactor had significantly better performance with respect to weight gain than both, those in the system where supernatant from the aerobic reactor was added, as well as the control system. It can be hypothesized that this effect was caused by the presence of NH4+ as well as dissolved organic matter, plant growth promoting rhizobacteria and fungi, and humic acid, which are predominantly present in anaerobic effluents. This study should therefore be of value to researchers and practitioners wishing to further develop sludge remineralization in aquaponic systems. View Full-Text
Keywords: aquaponics; anaerobic digestion; aerobic digestion; hydroponics; sludge; integrated aquaculture; horticulture; bio-fertilizer aquaponics; anaerobic digestion; aerobic digestion; hydroponics; sludge; integrated aquaculture; horticulture; bio-fertilizer
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Goddek, S.; Schmautz, Z.; Scott, B.; Delaide, B.; Keesman, K.J.; Wuertz, S.; Junge, R. The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce. Agronomy 2016, 6, 37.

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