Evolution of extracellular polymeric substances produced in two submerged membrane bioreactors working at high sludge age

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Title: Evolution of extracellular polymeric substances produced in two submerged membrane bioreactors working at high sludge age
Authors: Domínguez Chabaliná, Liuba | Rodríguez Pastor, Manuel | Prats, Daniel
Research Group/s: Recursos Hídricos y Desarrollo Sostenible
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario del Agua y de las Ciencias Ambientales
Keywords: Extracellular polymeric substances | Filtration | Membrane bioreactor | Microporous membranes | Statistical correlation | Wastewater treatment
Knowledge Area: Ingeniería Química
Issue Date: 2014
Publisher: WIT Press
Citation: WIT Transactions on The Built Environment. 2014, 145: 275-282. doi:10.2495/ICBEEE130351
Abstract: This research paper deals with the evolution of the extracellular polymeric substances (EPS) produced in the mixed liquor of two 25 L bench-scale membrane bioreactors (MBRs), with micro (MF-MBR) and ultrafiltration (UF-MBR) submerged membranes. The conclusion focuses on the relationship between the operation and how EPS respond, demonstrating that significant changes in EPS concentration were commonly observed when abrupt changes in the operational conditions took place. Bound EPS (EPSb) showed moderate positive statistical correlations with sludge age and MLSS for the two MBRs. Soluble EPS (EPSs), on the other hand, showed a moderate negative statistical correlation between EPSs with the two parameters analyzed for MF-MBR and no correlation with the UF-MBR was found. With respect to the composition of EPS, EPSb were mostly made up of proteins (44–46%) whereas in EPSs, the three components (proteins, carbohydrates, and humic substances) appeared in approximately the same proportion. The statistical analysis exhibited strong positive correlations between EPSb and their constituents, however for EPSs, the correlation was strong only with carbohydrates and moderate with humic substances.
Sponsor: This study was partially financed by the Ministry of Education via the projects “Treatment of superficial water and wastewater to obtain high quality effluents” (CTM2012-15348) and “Treatment and wastewater reuse for a sustainable management” (CONSOLIDER) (CSD200644), and by the Ministry of Environment via the project “Removal of organic micropollutants by MBR technology associated to nanofiltration” (I24/SGTB/2007/3.1).
URI: http://hdl.handle.net/10045/51625
ISSN: 1746-4498 (Print) | 1743-3509 (Online)
DOI: 10.2495/ICBEEE130351
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2014 WIT Press
Peer Review: si
Publisher version: http://dx.doi.org/10.2495/ICBEEE130351
Appears in Collections:INV - Recursos Hídricos y Desarrollo Sostenible - Artículos de Revistas

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