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- Valorization of a food industry orange waste as biostimulant plant growth: use of vibrational spectroscopy to early access their chemical compositionPublication . Monteiro, M.C.H.; Riaño, Berta; Vitória, Cláudia; García-González, María Cruz; Anjos, O.Orange peel is one of the highest wastes obtained from the orange processing industry. These wastes contain a balanced amount of sugar, cellulose, pectin's and hemicellulose, as well as an interesting amount of bioactive compounds. Such composition increases the interest of this product with biological activities in different food and non-food application.
- Fertiliser effect of ammonia recovered from anaerobically digested orange peel using gas-permeable membranes.Publication . Monteiro, M.C.H.; Riaño, Berta; Anjos, O.; García-González, María CruzThe 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.