RT info:eu-repo/semantics/article
T1 Effect of salinity and temperature on the extraction of extracellular polymeric substances from an anaerobic sludge and fouling in submerged hollow fibre membranes
A1 Martínez Díaz, Raquel
A1 Ruiz Pérez, María Olga
A1 García Rodríguez, Ana
A1 Ramos Rodríguez, Cipriano
A1 Diez Blanco, Victorino
K1 Extraction
K1 Membrane fouling
K1 Salinity
K1 Extracellular polymeric substances
K1 Humic substances
K1 Ingeniería química
K1 Chemical engineering
AB 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.
PB Elsevier
SN 0927-7757
YR 2021
FD 2021-09
LK http://hdl.handle.net/10259/6383
UL http://hdl.handle.net/10259/6383
LA eng
NO TCUE 2018–2020 cofounded by European Regional Development Fund (ERDF) and Junta de Castilla y León, Spain. Ana García is grateful to the European Social Fund the Operative Program of Castile-Leon, the Regional Government of Castile-Leon, Spain, through the Ministry of Education, for her research contract (Orden EDU/310/2015).
DS Repositorio Institucional de la Universidad de Burgos
RD 11-dic-2024