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    Citas

    Título
    Assessment of electrooxidation as pre- and post-treatments for improving anaerobic digestion and stabilisation of waste activated sludge
    Autor
    Arenas, Cristian B.
    González, Ruben
    González, Judith
    Cara Jiménez, JorgeAutoridad BuleriaORCID
    Papaharalabos, George
    Gómez Barrios, Xiomar ArlethAutoridad Buleria
    Martínez, E. Judith
    Facultad/Centro
    Facultad de Ciencias Biologicas y Ambientales
    Área de conocimiento
    Ingenieria Quimica
    Título de la revista
    Journal of Environmental Management
    Editor
    Elsevier
    Fecha
    2021
    ISSN
    0301-4797
    Abstract
    This study evaluates the effects of electro-oxidation as a means for enhancing sludge stabilisation. Boron-doped diamond electrodes were used to treat waste activated sludge and digestate under different operating parameters (current density, conductivity, pH, and time). Electro-oxidation runs affected the solubilisation of organic matter, which seemed to improve anaerobic digestion and dewaterability characteristics. Among the tested parameters, pre-treating sludge via electro-oxidation under alkaline conditions (Treatment T5) resulted in the highest increase in soluble organic material compared to that in the control, with total organic carbon (TOC) and soluble chemical oxygen demand (COD) values of 2753 and 7819 mg L−1, respectively (control TOC and COD values were 385 and 1073 mg L−1). This pretreatment also achieved a high hydrolysis rate (higher concentration in volatile fatty acids) with a concomitant increase in methane yield (approximately 18%). On the other hand, the application of electro-oxidation as a post-treatment for improving digestate dewaterability resulted in noticeable changes in the release of water during drying due to protein and aliphatic matrix modification of the sample.
    Materia
    Bioquímica
    Ecología. Medio ambiente
    Ingeniería química
    Palabras clave
    Electrochemical oxidation
    Sludge management
    Solubilisation
    Digestion performance
    Dewaterability
    FTIR
    Peer review
    SI
    URI
    http://hdl.handle.net/10612/13542
    DOI
    10.1016/j.jenvman.2021.112365
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