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Effects of bulking agent on the composting of “alperujo”, the solid by-product of the two-phase centrifugation method for olive oil extraction

AutorAlburquerque Méndez, José Antonio ; Gonzálvez, José; García, Diego; Cegarra Rosique, Juan
Palabras claveAlperujo
Olive-mill by-product
Bulking agent
Fecha de publicaciónene-2006
CitaciónProcess Biochemistry 41(1): 127-132 (2006)
ResumenA pollutant solid material known as “alperujo”, which is the main by-product of the Spanish olive oil extraction industry, was composted with either grape stalk (GS) or olive leaf (OL) as bulking agents. The experiment consisted of two piles which were composted for 34 weeks using forced ventilation (Rutgers strategy) assisted by mechanical turning. Then, substrates were allowed to mature during 16 weeks. Temperature, pH, total organic matter, total nitrogen, C/N ratio, water-soluble organic carbon, carbohydrates and phenols, fats, as well as the phytoxicity of the substrates were evaluated in order to monitor the composting progress. The composting performance was influenced by the characteristics of the bulking agents added, GS contributing more than OL to improve the advance of the process. However, both mature composts were equally free of phytotoxicity and showed a similar composition.
Descripción6 pages, 3 figures, 2 tables.
Versión del editorhttp://dx.doi.org/10.1016/j.procbio.2005.06.006
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