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Author(s): João H. O. S. Pereira
Ana C. Reis
Vera Homem
José A. Silva
Arminda Alves
Maria T. Borges
Rui A. R. Boaventura
Vítor J. P. Vilar
Olga C. Nunes
Title: Solar photocatalytic oxidation of recalcitrant natural metabolic by-products of amoxicillin biodegradation
Issue Date: 2014
Abstract: The contamination of the aquatic environment by non-metabolized and metabolized antibiotic residues has brought the necessity of alternative treatment steps to current water decontamination technologies. This work assessed the feasibility of using a multi-stage treatment system for amoxicillin (AMX) spiked solutions combining: i) a biological treatment process using an enriched culture to metabolize AMX, with ii) a solar photocatalytic system to achieve the removal of the metabolized transformation products (TPs) identified via LC-MS, recalcitrant to further biological degradation. Firstly, a mixed culture (MC) was obtained through the enrichment of an activated sludge sample collected in an urban wastewater treatment plant (WWTP). Secondly, different aqueous matrices spiked with AMX were treated with the MC and the metabolic transformation products were identified. Thirdly, the efficiency of two solar assisted photocatalytic processes (TiO2/UV or Fe3+/Oxalate/H2O2/UV-Vis) was assessed in the degradation of the obtained TPs using a lab-scale prototype photoreactor equipped with a compound parabolic collector (CPC). Highest AMX specific biodegradation rates were obtained in buffer and urban wastewater (WW) media (0.10 +/- 0.01 and 0.13 +/- 0.07 g(AMX) g(biomass)(-1) h(-1), respectively). The resulting TPs, which no longer presented antibacterial activity, were identified as amoxicilloic acid (m/ z = 384). The performance of the Fe3+/Oxalate/H2O2/UV-Vis system in the removal of the TPs from WW medium was superior to the TiO2/UV process (TPs no longer detected after 40 min (Q(UV) = 2.6 kJ L-1), against incomplete TPs removal after 240 mm (Q(UV) = 14.9 kJ L-1), respectively).
Subject: Engenharia de bioprocessos, Processos de purificação e separação, Tecnologia bioquímica, Engenharia química, Tratamento de águas residuais, Engenharia do ambiente
Bioprocess engineering, Downstream processing, Biochemical technology, Chemical engineering, Wastewater treatment, Environmental engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia do ambiente
Engineering and technology::Environmental engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/AAC-AMB/113091/2009/Eliminação de micropoluentes com actividade antimicrobiana de águas residuais/PTDC/AAC-AMB/113091/2009
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projetos Estratégicos/PEst-C/EQB/LA0020/2013/PROJECTO ESTRATÉGICO - LA 20 - 2013-2014/LA 20
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional
FEUP - Artigo em Revista Científica Internacional

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