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Aerobic granules in a sequencing batch bioreactor under fluoroquinolone shock loadings

2013-09-18Conference object Open access
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dc.contributor.authorAmorim, Catarina L.
dc.contributor.authorMaia, Alexandra S.
dc.contributor.authorMesquita, Raquel B. R.
dc.contributor.authorRangel, António O. S. S.
dc.contributor.authorTiritan, Maria E.
dc.contributor.authorCastro, Paula M. L.
dc.date.accessioned2013-11-06T14:26:05Z
dc.date.available2013-11-06T14:26:05Z
dc.date.issued2013-09-18
dc.description.abstractThe growing occurrence of human and veterinary pharmaceuticals in the environment is causing increasing concern. Fluoroquinolones (FQs) are broad-spectrum antibiotics that play an important role in the treatment of serious bacterial infections. Antibiotics can reach wastewater treatment plants (WWTP) from different routes. Domestic effluents are considered the major contributor but effluents from pharmaceutical industries and hospitals are also of great concern. Granular sequencing batch reactors (SBR) constitute a novel biofilm technology for wastewater treatment extremely promising for the treatment of effluents containing toxic compounds. Aerobic granular sludge has several advantages over activated sludge, such as excellent settling properties, high biomass retention, ability to deal with high organic loading rates and to perform simultaneously diverse biological processes, such as Chemical Oxygen Demand (COD), N and P removal. This study focused on the effect of intermittent and alternating feeding of different FQs, namely Ofloxacin (OFL), Norfloxacin (NOR) and Ciprofloxacin (CPF), on bioreactor performance and diversity of the microbial population. Activated sludge from a municipal WWTP was used as the inoculum for the start-up of the SBR. The aerobic granules grew under aerobic conditions and after ca. 3 months of reactor operation stable granules were observed. The FQs affected the granular sludge in terms of morphology, causing a decrease in granule size. The granules started to disintegrate and an increase in the levels of solids in the effluent after exposure to FQs occurred due to wash-out of unstable granules, concomitant with a decrease in the SBR bed volume. The effect of the target fluorinated pharmaceuticals on the main biological processes occurring in the granular sludge SBR, such as nitrification and phosphate removal, was evaluated. Ammonium and nitrite were practically not detected in the treated effluent (maximum concentration of 0.03 and 0.01 mM for NH4+-N and NO2--N, respectively) indicating that neither ammonia oxidizing bacteria (AOB) nor nitrite oxidizing bacteria (NOB) were inhibited by the presence of the FQs, whereas phosphate removal was affected. The phosphate released into the bulk liquid by the phosphate accumulating organisms (PAO) during the anaerobic feeding period was not completely removed and the levels of phosphate in the bioreactor effluent increased. The organic removal, measured by COD, was not markedly affected by FQ shock loads. Changes in the bacterial community from aerobic granules related to FQs shock loadings were examined using denaturing gradient electrophoresis (DGGE) of 16S rRNA. The clustering analysis suggested that samples clustered according to the temporal factor. The gradual succession observed in the bacterial assemblage composition was related with the exposure to FQs. Also, the microbial population present in the aerobic granules was also investigated by culture-dependent methods. Several bacterial isolates belonging to α- and ɣ-branch of the Proteobacteria phylum were retrieved from the granules. After ca. 2 months without FQs exposure, the SBR bed volume was recovered and the solid content at the bioreactor effluent returned to normal levels.por
dc.identifier.citationAMORIM, Catarina [et al.] - Aerobic granules in a sequencing batch bioreactor under fluoroquinolone shock loadings – In 7th International Conference on Environmental Engineering and Management - ICEEM07, Vienna, Austria, 18 -21 October, 2013 – In Conference Abstracts Book, (2013), ISBN: 978-973-621-418-9. 2p.por
dc.identifier.urihttp://hdl.handle.net/10400.14/13139
dc.language.isoengpor
dc.peerreviewedyespor
dc.relationPTDC/EBB-BBI/111699/2009por
dc.subjectFluoroquinolonespor
dc.subjectAerobic granular sludgepor
dc.titleAerobic granules in a sequencing batch bioreactor under fluoroquinolone shock loadingspor
dc.typeconference object
dspace.entity.typePublication
person.familyNameMaia
person.familyNameMesquita
person.familyNameSantos Silva Rangel
person.familyNameTiritan
person.familyNameCastro
person.givenNameAlexandra S.
person.givenNameRaquel
person.givenNameAntónio Osmaro
person.givenNameMaria Elizabeth
person.givenNamePaula
person.identifierJ-4630-2013
person.identifier1310409
person.identifier2013444
person.identifier.ciencia-id6A15-F0A3-AEF2
person.identifier.ciencia-idEB1D-DEE3-0B60
person.identifier.ciencia-idD61D-7CFB-178A
person.identifier.ciencia-idD915-BFC0-FB3A
person.identifier.ciencia-id7C1F-6C72-354A
person.identifier.orcid0000-0002-4167-383X
person.identifier.orcid0000-0001-7745-1860
person.identifier.orcid0000-0002-6486-8947
person.identifier.orcid0000-0003-3320-730X
person.identifier.orcid0000-0001-8841-6606
person.identifier.ridJ-4630-2013
person.identifier.ridK-9492-2014
person.identifier.ridM-8241-2013
person.identifier.scopus-author-id55332349300
person.identifier.scopus-author-id7005556626
person.identifier.scopus-author-id7004827387
person.identifier.scopus-author-id6602890981
person.identifier.scopus-author-id7102781782
rcaap.rightsopenAccesspor
rcaap.typeconferenceObjectpor
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