A novel and affordable bioaugmentation strategy with microbial extracts to accelerate the biodegradation of emerging contaminants in different media

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This study describes a new bioaugmentation alternative based on the application of aqueous aerated extracts from a biomixture acclimated with ibuprofen, diclofenac and triclosan. This bioaugmentation strategy was assayed in biopurification systems (BPS) and in contaminated aqueous solutions to accelerate the removal of these emerging contaminants. Sterilized extracts or extracts from the initial uncontaminated biomixture were used as controls. In BPS, the dissipation of 90% of diclofenac and triclosan required, respectively, 60 and 108 days less than in the controls. The metabolite methyl-triclosan was determined at levels 12 times lower than in controls. In the bioaugmented solutions, ibuprofen was almost completely eliminated (99%) in 21 days and its hydroxylated metabolites were also determined to be at lower levels than in the controls. The plasmidome of acclimated biomixtures and its extract appeared to maintain certain types of plasmids but degradation related genes became less evident. Several dominant OTUs found in the extract identified as Flavobacterium and Fluviicola of the phylum Bacteroidetes, Thermomicrobia (phylum Chloroflexi) and Nonomuraea (phylum Actinobacteria), may be responsible for the enhanced dissipation of these contaminants. This bioaugmentation strategy represents an advantageous tool to facilitate in situ bioaugmentation.

OriginalsprogEngelsk
Artikelnummer155234
TidsskriftScience of the Total Environment
Vol/bind834
Antal sider10
ISSN0048-9697
DOI
StatusUdgivet - 2022

Bibliografisk note


Funding Information:
This study was supported by the Spanish Ministry of Economy and Competitiveness and the Spanish State Research Agency (AEI) (projects CTM2013-44271-R and CTM2017-86504-R ), and co-financing from the European Regional Development Fund (ERDF). Inés Aguilar-Romero thanks her FPI grant. GC–MS analyses were carried out by the Scientific Instrumentation Services of the Estación Experimental del Zaidín (CSIC), Granada, Spain. The authors wish to thank Celia Cifuentes for her technical assistance. Finally, we would like to thank Angela Tate for proofreading the manuscript.

Publisher Copyright:
© 2022 Elsevier B.V.

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