Author(s): Horta, Carmo ; Riano, Berta ; Anjos, Ofélia ; Garcia-González, Maria Cruz
Date: 2022
Persistent ID: http://hdl.handle.net/10400.5/24929
Origin: Repositório da Universidade de Lisboa
Subject(s): bio-based fertiliser; FT-Raman; nitrogen fertiliser replacement value; orange bio-waste; plant biostimulant
Themanufacture ofmineralNfertilisers by theHaber–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 L1, 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 mg1N 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 fertiliser with a biostimulant effect
