Abstract
Wastewater treatment plants face major social concern towards removal of problematic pollutants such as fat oils and grease (FOG). In this context, the main objective of the present work was to select natural bacterial isolates from different polluted sites and evaluate them comparatively to isolates from commercial products, for improved bioremediation strategies and bioaugmentation. In total, 196 isolates were analysed for genomic diversity by two PCR-fingerprinting methods and screened for biodegradation potential with pollutants as sole carbon source. The net area under curve (NAUC) was used for preliminary evaluation of growth ability in M9 medium supplemented with oleic acid and triolein. A principal component analysis of all NAUC data showed that natural isolates presented higher overall biodegradation ability and enabled the selection of 11 natural isolates for lipid degradation assays. Selected isolates were identified by 16S rRNA gene sequencing as members of genera with previously described degradative strains, namely, Acinetobacter (1), Aeromonas (2), Bacillus (1), Pseudomonas (1) and Staphylococcus (6). Best biodegradation results in 7-days assay of FOG content removal were 37.9% for oleic acid and 19.1% for triolein by an Aeromonas sp. isolate and a Staphylococcus cohnii isolate, respectively. A respirometry approach confirmed their higher oxygen uptake rates, although longer adaptation phases where required by the Aeromonas sp. isolate. Consequently, these isolates showed great potential for future bioaugmentation products, to promote FOG degradation, for both in situ and ex situ approaches.
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This study was funded by Fundação para Ciência e Tecnologia and enterprise BioTask, Biotecnologia Lda through a PhD scholarship (SFRH/BDE/95903/2013). The experimental work was also supported by UID/MULTI/04046/2019 research unit grant from Fundação para Ciência e Tecnologia to Biosystems & Integrative Sciences Institute, BioISI.
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P. Teixeira has received research grants, and V. Silva owns stocks in BioTask, Biotecnologia, Lda. R. Tenreiro declares that he has no conflict of interest.
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Teixeira, P.D., Silva, V.S. & Tenreiro, R. Integrated selection and identification of bacteria from polluted sites for biodegradation of lipids. Int Microbiol 23, 367–380 (2020). https://doi.org/10.1007/s10123-019-00109-w
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DOI: https://doi.org/10.1007/s10123-019-00109-w