Drying or anaerobic digestion of fish sludge: Nitrogen fertilisation effects and logistics
Open Access
- 7 June 2017
- journal article
- other
- Published by Springer Science and Business Media LLC in AMBIO
- Vol. 46 (8), 852-864
- https://doi.org/10.1007/s13280-017-0927-5
Abstract
Application of fish sludge as fertiliser to agricultural land can contribute to closing nutrient cycles in fish farming. The effect of different treatment technologies on the nitrogen fertilisation effects of fish sludge was studied by a bioassay with barley (Hordeum vulgare), an incubation and a field experiment. Dried fish sludge resulted in relative agronomic efficiency of 50–80% compared with mineral fertiliser. The anaerobic digestate based on fish sludge (20 vol%) and dairy manure did not increase nitrogen uptake in barley. Increasing the ratio of fish sludge in the digestate increased the fertilisation effect, but requires optimisation of the biogas process. A simple logistics analysis conducted for a case hatchery showed that on-site drying and co-digestion of fish sludge in a central biogas plant can be regarded as equal in terms of costs. Norway can become an exporter of fish sludge-based recycling fertilisers if current regulations are modified to facilitate nutrient recycling.Keywords
Funding Information
- Fish Sludge as Resource for Bioenergy and Plant Growth (227401)
- Bioenergy Innovation Centre (193817)
- Sustained and increased organic cereal production by improved nutrient supply and pest control (207686)
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