Article (Scientific journals)
The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce
Goddek, Simon; Schmautz, Zala; Scott, Ben et al.
2016In Agronomy, 6 (2), p. 37
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© 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).


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Keywords :
aerobic digestion; anaerobic digestion; aquaponics; bio-fertilizer; horticulture; hydroponics; integrated aquaculture; sludge
Abstract :
[en] 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.
Disciplines :
Agriculture & agronomy
Author, co-author :
Goddek, Simon
Schmautz, Zala
Scott, Ben
Delaide, Boris ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Gestion durable des bio-agresseurs
Keesman, Karel
Wuertz, Sven
Junge, Ranka
Language :
English
Title :
The Effect of Anaerobic and Aerobic Fish Sludge Supernatant on Hydroponic Lettuce
Publication date :
2016
Journal title :
Agronomy
eISSN :
2073-4395
Publisher :
MDPI AG, Switzerland
Volume :
6
Issue :
2
Pages :
37
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 October 2020

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