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Removal of microbial indicators from municipal wastewater by a membrane bioreactor (MBR)

The impact of removable and irremovable fouling on the retention of viral and bacterial indicators by the submerged microfiltration membrane in an MBR pilot plant was evaluated. Escherichia coli, sulphite-reducing Clostridium spores, somatic coliphages and F-specific RNA bacteriophages were used as indicators. The membrane demonstrated almost complete removal of E. coli and sulphite-reducing Clostridium spores. However, there was no correlation with membrane fouling. The phage removal varied in accordance with the irremovable fouling, rising from 2.6 to 5.6 log10 units as the irremovable fouling increased (measured by the change in the transmembrane pressure). In contrast, removable fouling did not have any effect on the retention of viruses by the membrane. These results indicate that irremovable membrane fouling may affect the removal efficiency of MBRs and, therefore, their capacity to ensure the required microbiological standards for the permeate achieved

This research was partially funded by the Spanish Ministry of Education and Science and Innovation (CTM2009-14742-C02-01) and (CONSOLIDER-CSD2007-00055)

© Bioresource Technology, 2011, vol. 102, núm. 8, p. 5004-5009

Elsevier

Author: Martí Serrano, Elisabet
Monclús Sales, Hèctor
Jofre, Juan
Rodríguez-Roda Layret, Ignasi
Comas Matas, Joaquim
Balcázar, José Luis
Date: 2011
Abstract: The impact of removable and irremovable fouling on the retention of viral and bacterial indicators by the submerged microfiltration membrane in an MBR pilot plant was evaluated. Escherichia coli, sulphite-reducing Clostridium spores, somatic coliphages and F-specific RNA bacteriophages were used as indicators. The membrane demonstrated almost complete removal of E. coli and sulphite-reducing Clostridium spores. However, there was no correlation with membrane fouling. The phage removal varied in accordance with the irremovable fouling, rising from 2.6 to 5.6 log10 units as the irremovable fouling increased (measured by the change in the transmembrane pressure). In contrast, removable fouling did not have any effect on the retention of viruses by the membrane. These results indicate that irremovable membrane fouling may affect the removal efficiency of MBRs and, therefore, their capacity to ensure the required microbiological standards for the permeate achieved
This research was partially funded by the Spanish Ministry of Education and Science and Innovation (CTM2009-14742-C02-01) and (CONSOLIDER-CSD2007-00055)
Format: application/pdf
ISSN: 0960-8524
Document access: http://hdl.handle.net/10256/12524
Language: eng
Publisher: Elsevier
Collection: MICYT/2009-2011/CTM2009-14742-C02-01
MEC/PN 2007-2013/CSD2007-00055
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.biortech.2011.01.068
Articles publicats (D-EQATA)
Is part of: © Bioresource Technology, 2011, vol. 102, núm. 8, p. 5004-5009
Rights: Tots els drets reservats
Subject: Bioreactors
Reactors de membrana
Membrane reactors
Membranes (Tecnologia)
Membranes (Technology)
Aigües residuals -- Microbiologia
Sewage -- Microbiology
Title: Removal of microbial indicators from municipal wastewater by a membrane bioreactor (MBR)
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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