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Microbiome adaptation of aerobic granular sludge allows process resilience during the treatment of seawater-based wastewater with pharmaceuticals

dc.contributor.authorMiranda, Catarina
dc.contributor.authorMaia, Alexandra S.
dc.contributor.authorTiritan, Maria Elizabeth
dc.contributor.authorCastro, Paula M. L.
dc.contributor.authorAmorim, Catarina L.
dc.date.accessioned2025-04-04T09:59:24Z
dc.date.available2025-04-04T09:59:24Z
dc.date.issued2025-04
dc.description.abstractCoastal wastewater treatment plants often face multiple stressors (e.g., pharmaceuticals and oscillating seawater levels) simultaneously, and their combined effects on biological treatment systems are still largely underestimated. In this study, an aerobic granular sludge (AGS) reactor was challenged over a four-month period with wastewater that had daily fluctuations in seawater content (7.5 to 22.5 g/L) and occasionally contained two pharmaceuticals, venlafaxine (VNF) and tramadol (TRA), and their metabolites (O-desmethylvenlafaxine and O-desmethyltramadol), a combination that closely mimics real-world conditions. Over time, pharmaceuticals removal improved, especially for VNF and TRA. For VNF, monitored using an enantiomer-discriminating method, non-enantioselective removal was observed, indicating that the removal most probably occurred through adsorption. Despite the pharmaceuticals' presence in wastewater, the chemical oxygen demand removal was efficient (89 ± 3 %), and ammonium removal was complete, with nitrate as the main nitrification end-product. During the period of sporadic pharmaceuticals presence in wastewater, extracellular polymeric substances (EPS) content within AGS increased up to 196 ± 5 mg/g TSS, possibly contributing to the improvement of pharmaceuticals' adsorption and AGS functional stability. The AGS core microbiome comprised several functional taxa sustaining the system performance under stress exposure. The AGS bacteriome steadily adapted to the changes in wastewater composition, presenting distinct bacterial signatures in each stage. Paracoccus, an EPS-producing genus, was enriched during pharmaceuticals load, which may have been crucial for the system's stability. The adaptable and versatile microbiome of the AGS under multiple wastewater stressors contributed to the system's resilience, expanding its applicability for wastewater treatment in vulnerable areas.eng
dc.identifier.doi10.1016/j.jwpe.2025.107592
dc.identifier.eid105001401284
dc.identifier.issn2214-7144
dc.identifier.urihttp://hdl.handle.net/10400.14/52922
dc.identifier.wos001458730400001
dc.language.isoeng
dc.peerreviewedyes
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectAerobic granular sludge
dc.subjectExtracellular polymeric substances
dc.subjectMicrobiome
dc.subjectPharmaceuticals
dc.subjectRemoval performance
dc.titleMicrobiome adaptation of aerobic granular sludge allows process resilience during the treatment of seawater-based wastewater with pharmaceuticalseng
dc.typeresearch article
dspace.entity.typePublication
oaire.citation.titleJournal of Water Process Engineering
oaire.citation.volume72
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85

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