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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/74280

    Título
    A novel approach for nutrients recovery from municipal waste as biofertilizers by combining electrodialytic and gas permeable membrane technologies
    Autor
    Oliveira, Veronica
    Dias Ferreira, Celia
    González García, Isabel
    Labrincha, João
    Horta, Carmo
    García González, María CruzAutoridad UVA Orcid
    Año del Documento
    2021
    Documento Fuente
    Waste Management, abril 2021, vol. 125, p. 293-302
    Resumo
    The recovery of valuable materials from waste fits the principle of circular economy and sustainable use of resources, but contaminants in the waste are still a major obstacle. This works proposes a novel approach to recover high-purity phosphorus (P) and nitrogen (N) from digestate of municipal solid waste based on the combination of two independent membrane processes: electrodialytic (ED) process to extract P, and gas permeable membranes (GPM) for N extraction. A laboratory ED cell was adapted to accommodate a GPM. The length of waste compartment (10 cm; 15 cm), current intensity (50 mA; 75 mA) and operation time (9 days; 12 days) were the variables tested. 81% of P in the waste was successfully extracted to the anolyte when an electric current of 75 mA was applied for 9 days, and 74% of NH4+ was extracted into an acid-trapping solution. The two purified nutrient solutions were subsequently used in the synthesis of a biofertilizer (secondary struvite) through precipitation, achieving an efficiency of 99.5%. The properties of the secondary struvite synthesized using N and P recovered from the waste were similar to secondary struvite formed using synthetic chemicals but the costs were higher due to the need to neutralize the acid-trapping solution, highlighting the need to further tune the process and make it economically more competitive. The high recycling rates of P and N achieved are encouraging and widen the possibility of replacing synthetic fertilizers, manufactured from finite sources, by secondary biofertilizers produced using nutrients extracted from wastes.
    ISSN
    0956-053X
    Revisión por pares
    SI
    DOI
    10.1016/j.wasman.2021.02.055
    Idioma
    spa
    URI
    https://uvadoc.uva.es/handle/10324/74280
    Tipo de versión
    info:eu-repo/semantics/draft
    Derechos
    openAccess
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    • DEP08 - Artículos de revista [82]
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    Borrador Oliveira et al., 2021.docx
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    Universidad de Valladolid

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