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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6383

    Título
    Effect of salinity and temperature on the extraction of extracellular polymeric substances from an anaerobic sludge and fouling in submerged hollow fibre membranes
    Autor
    Martínez Díaz, Raquel
    Ruiz Pérez, María OlgaUBU authority Orcid
    García Rodríguez, AnaUBU authority Orcid
    Ramos Rodríguez, CiprianoUBU authority Orcid
    Diez Blanco, VictorinoUBU authority Orcid
    Publicado en
    Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2021, V. 625, 126910
    Editorial
    Elsevier
    Fecha de publicación
    2021-09
    ISSN
    0927-7757
    DOI
    10.1016/j.colsurfa.2021.126910
    Abstract
    The results of the characterisation of anaerobic sludge-derived extracellular polymeric substances (EPS) under different extraction conditions and their effects on the fouling in submerged hollow fibre membranes are presented. A wide range of EPS extraction results was obtained depending on the extraction conditions. Proteins, polysaccharides, and humic substances represented 80–99% of the total organic matter extracted, with 54–60% identified as humic substances. Ultrasonication was more effective than vortex agitation, ensuring higher EPS extraction yields in a shorter contact time. The increase in temperature from 30 °C to 50 °C and the decrease in NaCl concentration favoured the EPS diffusion, but this positive temperature effect was negligible for an ultrasonic contact. Linear, quadratic, and combined effects of ultrasonication time and solvent salinity were statistically significant effects for ultrasonication-assisted EPS extraction. The highest extraction yield was achieved using ultrasonication at 30 ºC for at least 60 min with salt-free water as the solvent, and an EPS extract with 138.8 mg TOC/L was obtained. Batch ultrafiltration-backwash tests at different permeation rates allowed to determine the specific resistance to filtration of the EPS extracts, which increased from 103.8·1012 m/kg TOC to 169.4·1012 m/kg TOC in presence of 1.8 wt% of NaCl. Salinity also provided rigidity to the EPS gel layer, reducing the compressibility index from 0.23 to 0.03.
    Palabras clave
    Extraction
    Membrane fouling
    Salinity
    Extracellular polymeric substances
    Humic substances
    Materia
    Ingeniería química
    Chemical engineering
    URI
    http://hdl.handle.net/10259/6383
    Versión del editor
    https://doi.org/10.1016/j.colsurfa.2021.126910
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