Revealing the role of supernatant and granular sludge fractions on granular anaerobic membrane bioreactor fouling
dc.contributor.author
dc.date.accessioned
2024-02-12T12:52:49Z
dc.date.available
2024-02-12T12:52:49Z
dc.date.issued
2022-10-01
dc.identifier.issn
2214-7144
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dc.description.abstract
In order to design efficient fouling mitigation strategies in granular anaerobic membrane bioreactors (G-AnMBR), foulant characteristics and their role have to be thoroughly investigated. Raw mixed liquor of G-AnMBR was split by sieving into granules and supernatant fractions at 0.125 mm. Then, the fouling potential and reversibility of the different samples (granules, supernatant and raw mixed liquor) were assessed by measuring critical fluxes and through filtration tests. Various hydrodynamic conditions, i.e. gas sparging and recirculation, were applied to evaluate the impact of shear stress on fouling propensity. Results revealed that the supernatant fraction, composed of fine compounds and micro-particles, had a strong fouling potential, whilst the granule fraction led to minor fouling filtration resistance. Three-dimensional excitation emission fluorescence spectroscopy emphasised the prominent role of colloidal proteins in G-AnMBR membrane fouling. During the filtration test of raw mixed liquor, the fouling propensity of the micro-particles was lowered, since the structural cake layer was modified. Gas sparging allowed for the mitigation of cake formation, but excess of shear forces may lead to granule break-up and more irreversible fouling. Liquid recirculation led to a higher filtration resistance, but almost all the membrane permeability was recovered by physical cleaning. A short filtration cycle without gas sparging followed by a short period of relaxation and gas sparging could be a suitable fouling mitigation method. In this way, release of micro-particles from granule break-up could be limited, the cake build-up would be mostly reversible by physical cleaning, and the energy demand of gas sparging would be greatly reduced, thereby improving the energy neutrality of the G-AnMBR biotechnology
dc.format.mimetype
application/pdf
dc.language.iso
eng
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Versió postprint del document publicat a: https://doi.org/10.1016/j.jwpe.2022.103168
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© Journal of Water Process Engineering, 2022, vol. 49, art.núm.103168
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Articles publicats (D-EQATA)
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Tots els drets reservats
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Sanchez, Lucie Lesage, Geoffroy Demiral, Yasar Onur Rodríguez-Roda Layret, Ignasi Héran, Marc Blandin, Gaetan 2022 Revealing the role of supernatant and granular sludge fractions on granular anaerobic membrane bioreactor fouling Journal Of Water Process Engineering 49 art.núm.103168
dc.subject
dc.title
Revealing the role of supernatant and granular sludge fractions on granular anaerobic membrane bioreactor fouling
dc.type
info:eu-repo/semantics/article
dc.rights.accessRights
info:eu-repo/semantics/embargoedAccess
dc.embargo.lift
2024-10-01T00:00:00Z
dc.embargo.terms
2024-10-01T00:00:00Z
dc.date.embargoEndDate
info:eu-repo/date/embargoEnd/2024-10-01
dc.type.version
info:eu-repo/semantics/acceptedVersion
dc.identifier.doi
dc.identifier.idgrec
038052
dc.type.peerreviewed
peer-reviewed
dc.identifier.eissn
2214-7144