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Publication
Fertiliser effect of ammonia recovered from anaerobically digested orange peel using gas-permeable membranes.
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Advisor(s)
Abstract(s)
The manufacture of mineral N fertilisers by the Haber–Bosch process is highly energy-consuming.
The nutrient recovery technologies from wastes through low-cost processes will improve the sustainability of the agricultural systems. This work aimed to assess the suitability of the gas-permeable membrane (GPM) technology to recover N from an anaerobic digestate and test the agronomic behaviour of the ammonium sulphate solution (ASS) obtained. About 62% of the total ammonia nitrogen removed from digestate using GPM was recovered, producing an ASS with 14,889 +/- 2324 mg N L-1, which was more than six-fold higher than in digestate. The ASS agronomic behaviour was evaluated by a pot experiment with triticale as a plant test for 34 days in a growth chamber. Compared with the triticale fertilised with the Hoagland solution (Hoag), the ASS provided significantly higher biomass production (+29% dry matter), N uptake (+22%), and higher N agronomic efficiency 3.80 compared with 1.81 mg DM mg-1N in Hoag, and a nitrogen fertiliser replacement value of 133%.
These increases can be due to a biostimulant effect provided by the organic compounds of the ASS as assessed by the FT-Raman spectroscopy. The ASS can be considered a bio-based mineral N fertilizer with a biostimulant effect.
Description
Keywords
Bio-based fertiliser FT-Raman Nitrogen fertiliser replacement value Orange bio-waste Plant biostimulant
Citation
MONTEIRO, M.C.H. [et al.] (2022) - Fertiliser effect of ammonia recovered from anaerobically digested orange peel using gas-permeable membranes. Sustainability. ISSN 2071-1050. 14, 7832.
Publisher
MDPI