Eliminating partial-transformation products and mitigating residual toxicity of amoxicillin through intimately coupled photocatalysis and biodegradation
Intimately coupled photocatalysis and biodegradation (ICPB) is a promising technology for treating wastewater containing antibiotics. While past work has documented the benefits of ICPB for removing and mineralizing antibiotics, its impacts on mitigating biotoxicity from products has not been studie...
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Veröffentlicht in: | Chemosphere (Oxford) 2019-12, Vol.237, p.124491, Article 124491 |
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Sprache: | eng |
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Zusammenfassung: | Intimately coupled photocatalysis and biodegradation (ICPB) is a promising technology for treating wastewater containing antibiotics. While past work has documented the benefits of ICPB for removing and mineralizing antibiotics, its impacts on mitigating biotoxicity from products has not been studied. We fabricated an ICPB carrier by coating Ag-doped TiO2 on the outer skeleton of sponge carriers and allowing biofilm to grow in the internal macro-pores. We used amoxicillin (C16H19N3O5S) as the model antibiotic. The amoxicillin-removal rate contents with ICPB was greater by 40% vs. photocatalysis and 65% vs. biodegradation, based on the first-order kinetic simulation. While mineralization of amoxicillin was minimal for photocatalysis or biodegradation alone, it was ∼35% with ICPB. Photocatalysis alone led to accumulation of C14H21N3O2S; biodegradation alone resulted in accumulation of C14H21N3O3, C16H18N2O4S, and C15H21N3O3; but they were negligible after ICPB. As a result, ICPB reduced toxicity impacts measured by Staphylococcus aureas growth, Daphnia magna mobility, and teratogenicity to Zebrafish embryos. In contrast, photocatalysis alone increased each of the toxicity effects. In sum, ICPB gave greater removal and mineralization of amoxicillin, and it mitigated biotoxicity from treatment products.
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•Intimate cooperation of AOP and biodegradation was achieved in an ICPB-reactor.•Cooperation accelerated the amoxicillin degradation of the sole processes.•The intimate cooperation remarkably mitigated AMO product toxicity.•AMO removal accelerated 54% and COD removal enhanced by 65% (vs. sole AOP). |
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ISSN: | 0045-6535 1879-1298 |
DOI: | 10.1016/j.chemosphere.2019.124491 |