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Impacts of decommissioning and upgrading urban wastewater treatment plants on the water quality in a shellfish farming coastal lagoon (Ria Formosa, South Portugal)

2020Journal article Open access
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dc.contributor.authorJacob, J.
dc.contributor.authorCorreia, Cátia
dc.contributor.authorTorres, Ana Flor
dc.contributor.authorXufre, Gustavo
dc.contributor.authorMatos, André Filipe
dc.contributor.authorFerreira, Cristina
dc.contributor.authorReis, Margarida
dc.contributor.authorCaetano, Sandra
dc.contributor.authorFreitas, Carla
dc.contributor.authorBarbosa, Ana B.
dc.contributor.authorCravo, Alexandra
dc.date.accessioned2021-06-24T11:36:06Z
dc.date.available2021-06-24T11:36:06Z
dc.date.issued2020
dc.description.abstractRia Formosa is a productive coastal lagoon, located on the south coast of Portugal, and represents the largest national producer of shellfish bivalves (ca. 90% production). This ecosystem is subjected to various anthropogenic pressures, including the discharge of urban wastewater treatment plants (UWWTP), which impacts the lagoon water quality. This study aimed to assess the impact of alterations in the functioning of two UWWTP on the water quality of Ria Formosa, based on chemical variables, phytoplankton composition ( including potential harmful species) and faecal contamination. During the period September 2018 - October 2019, water sampling was conducted along dominant longitudinal gradients of the effluent dispersion from the discharge point (1-2 km), for two sites: a decommissioned (OP) and a modified (FO) UWWTP. After modification, the later started receiving a higher influent volume (ca. 40%), under an innovative technology system (biological treatment in aerobic granular sludge). Based on chemical water quality variables, phytoplankton and indicators of faecal contamination, a significant improvement along the longitudinal gradient from the discharge point was observed after OP decommissioning. This improvement was fast, being detected two months after decommissioning, positively affecting areas used as shellfish farming grounds. However, distribution patterns of bacteriological indicators and regular shellfish harvesting interdictions suggested an alternative source of faecal contamination after OP decommissioning. At FO, both chemical variables and bacteriological indicators of faecal contamination revealed a slower improvement, only six-months after the UWWTP alteration. Before that, increased and highly variable ammonium, chlorophyll a concentration, phytoplankton abundances and Escherichia coli densities, revealed an unstable phase. Overall, a lower water quality at FO in respect to OP reflected not only a higher effluent volume but also more restricted water circulation for the former.
dc.description.sponsorship[PO Mar2020 (MAR-01.04.02-FEAMP-0003)]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.2112/SI95-009.1
dc.identifier.issn0749-0208
dc.identifier.urihttp://hdl.handle.net/10400.1/16629
dc.language.isoeng
dc.peerreviewedyes
dc.publisherCoastal Education & Research Foundation
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectRia Formosa
dc.subjectBivalves
dc.subjectSewage impact
dc.subjectWastewater treatment plants
dc.subject.otherEnvironmental Sciences & Ecology; Physical Geography; Geology
dc.titleImpacts of decommissioning and upgrading urban wastewater treatment plants on the water quality in a shellfish farming coastal lagoon (Ria Formosa, South Portugal)
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage50
oaire.citation.startPage45
oaire.citation.titleJournal of Coastal Research
person.familyNameJacob
person.familyNameCorreia
person.familyNameTorres
person.familyNameMatos
person.familyNameReis
person.familyNameCaetano
person.familyNameBarbosa
person.familyNameCravo
person.givenNameJosé
person.givenNameCátia
person.givenNameAna Flor
person.givenNameAndré Filipe
person.givenNameMargarida
person.givenNameSandra
person.givenNameAna
person.givenNameAlexandra
person.identifier.ciencia-id7210-CCF6-4C5E
person.identifier.ciencia-id3017-A30B-6C8E
person.identifier.ciencia-id2F1C-2A1C-C7D4
person.identifier.ciencia-id5815-EE93-D672
person.identifier.ciencia-idF514-2180-4CF8
person.identifier.ciencia-id7419-EE20-8039
person.identifier.orcid0000-0001-9718-7470
person.identifier.orcid0000-0002-2228-5292
person.identifier.orcid0000-0002-1789-3701
person.identifier.orcid0000-0001-7271-4502
person.identifier.orcid0000-0003-0552-0868
person.identifier.orcid0000-0002-7402-246X
person.identifier.orcid0000-0002-2569-3929
person.identifier.scopus-author-id36552467800
person.identifier.scopus-author-id25623703900
person.identifier.scopus-author-id7103244778
rcaap.rightsrestrictedAccess
rcaap.typearticle
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