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Enrichment and key features of a robust and consistent indigenous marine-cognate microbial consortium growing on oily bilge wastewaters

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Abstract

Oily bilge wastewater (OBW) is a hazardous hydrocarbon-waste generated by ships worldwide. In this research, we enriched, characterized and study the hydrocarbon biodegradation potential of a microbial consortium from the bilges of maritime ships. The consortium cZ presented a biodegradation efficiency of 66.65% for total petroleum hydrocarbons, 72.33% for aromatics and 97.76% removal of n-alkanes. This consortium showed the ability to grow in OBWs of diverse origin and concentration. A 67-fold increase in biomass was achieved using a Sequential Batch Reactor with OBW as the only carbon and energy source. The bacterial community composition of the enriched OBW bacterial consortium at the final stable stage was characterized by 16S amplicon Illumina sequencing showing that 25 out of 915 of the emerged predominant bacterial types detected summed up for 84% of total composition. Out of the 140 taxa detected, 13 alone accumulated 94.9% of the reads and were classified as Marinobacter, Alcanivorax, Parvibaculum, Flavobacteriaceae, Gammaproteobacteria PYR10d3, Novispirillum and Xanthomonadaceae among the most predominant, followed by Thalassospira, Shewanella, Rhodospirillaceae, Gammaprotobacteria, Rhodobacteriaceae and Achromobacter. The microbial community from OBW bioreactor enrichments is intrinsically diverse with clear selection of predominant types and remarkably exhibiting consistent and efficient biodegradation achieved without any nutrient or surfactant addition. Due to there is very little information available in the OBW biodegradation field, this work contributes to the body of knowledge surrounding the treatment improvement of this toxic waste and its potential application in wastewater management.

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Data availability

European Nucleotide Archive, accession number: PRJEB36985.

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Acknowledgements

We would like to thank to Laboratorio de Análisis Fares Taie (www.farestaie.com.ar) for facilitating and conducting the laboratory analysis of OBW samples collected on this study. We also thank the collaboration of Dr. Enrique Ros, from the Universidad Nacional de la Patagonia San Juan Bosco, and Dr. Ignacio Durruty, from Universidad Nacional de Mar del Plata for their advice. H. Junca would like to thank Dr. Erika García-Bonilla (Microbiomas Foundation) and Dr. Ericsson Coy-Barreras (InquiBio, UMNG) for excellent scientific and infrastructure support and to Armando Junca and Rosa Peinado for financial support (Escuela para amar el agua). We also would like to thank the financial support from Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC) and Universidad Nacional de Mar del Plata for reaserchers salaries and grants.

Funding

This project was supported partially by VT38-UNMdP10982, PIT-AP-BA-2016, PICT 2014-1567, CIC Ideas-Proyecto de Investigación en Temas Prioritarios y de Impacto Para la Provincia de Buenos Aires Res. Nº 801/18.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by MN, GC, MV, AM and MLP. Supervision was performed by SEM, HJ, and JFG. The first draft of the manuscript was written by MN and all authors commented on previous versions of the manuscript.

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Correspondence to Melina Nisenbaum.

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All authors agreed with the content and that all gave explicit consent to submit this publication and they obtained consent from the responsible authorities at the institute/organization where the work has been carried out.

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10532_2020_9896_MOESM1_ESM.xls

Supplementary file1 (XLS 162 kb). EMS 1 Table including OTUs ID, classification, relative frequencies and corresponding representative sequences of all the OTUs determined in the microbial consortium

10532_2020_9896_MOESM2_ESM.docx

Supplementary file2 (DOCX 33 kb). EMS 2 Metabolic characteristics putatively associated to the predominant bacterial taxa detected in OBW degrading consortium

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Nisenbaum, M., Corti-Monzón, G., Villegas-Plazas, M. et al. Enrichment and key features of a robust and consistent indigenous marine-cognate microbial consortium growing on oily bilge wastewaters. Biodegradation 31, 91–108 (2020). https://doi.org/10.1007/s10532-020-09896-w

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  • DOI: https://doi.org/10.1007/s10532-020-09896-w

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