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Advisor(s)
Abstract(s)
Fluoroquinolones (FQs) have been reported in trace amounts in different environmental matrices. The
biosorption of three most prescribed FQs, ofloxacin (OFL), norfloxacin (NOR) and ciprofloxacin (CPF) by
activated sludge (AS) and aerobic granular sludge (AGS) was investigated. Biosorption assays were
conducted with FQs concentrations within the range of 100e700 ng mL 1, to mimic environmental
conditions.
At neutral pH and at the end of 48 h, AS showed higher biosorption capacity than AGS. For AS, a
maximum biosorption of 1.50 ± 0.03, 3.24 ± 0.05 and 3.39 ± 0.06 mg gTSS
1 was observed for OFL, NOR and
CPF respectively, whereas for AGS the maximum amount of FQs biosorbed was 1.18 ± 0.03, 2.73 ± 0.02
and 2.94 ± 0.03 mg gTSS
1.
Langmuir isotherm was more applicable for describing FQs biosorption equilibrium by AS while for
AGS, the Freundlich isotherm was more adequate. Given the AGS technology innovative character, the
effect of change of pH on the biosorbed FQs was evaluated. FQs could be desorbed from AGS at pH 3, pH 8
and pH 9 but at pH 4 the biosorption process was promoted. This study allows a better understanding of
the FQs biosorption processes. Moreover, the data from biosorption/desorption from AGS may be useful
for management and operation of AGS bioreactors
Description
Keywords
Fluoroquinolones Biosorption Activated sludge Aerobic granular sludge
Pedagogical Context
Citation
FERREIRA, Vanessa R.A.; AMORIM, Catarina L.; CRAVO, Sara M.; TIRITAN, M. E.; CASTRO, P. M. L.; AFONSO, Carlos M. M. - Fluoroquinolones biosorption onto microbial biomass: Activated sludge and aerobic granular sludge. International Biodeterioration & Biodegradation. ISSN 0964-8305. Vol. 110 (2016), p. 53-60
Publisher
Elsevier