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Fluoroquinolones biosorption onto microbial biomass: activated sludge and aerobic granular sludge

Title
Fluoroquinolones biosorption onto microbial biomass: activated sludge and aerobic granular sludge
Type
Article in International Scientific Journal
Year
2016
Authors
Ferreira, VRA
(Author)
Other
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Amorim, CL
(Author)
Other
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Sara Cravo
(Author)
FFUP
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M E Tiritan
(Author)
FFUP
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Castro, PML
(Author)
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Carlos Afonso
(Author)
FFUP
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Journal
The Journal is awaiting validation by the Administrative Services.
Vol. 110
Pages: 53-60
ISSN: 0964-8305
Other information
Authenticus ID: P-00K-899
Abstract (EN): 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 100-700 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 gi-ls 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 g(TSS)(-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.
Language: English
Type (Professor's evaluation): Scientific
No. of pages: 8
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