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Burkholderia vietnamiensis G4 as a biological agent in bioremediation processes of polycyclic aromatic hydrocarbons in sludge farms

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Abstract

Polycyclic aromatic hydrocarbons (PAHs) are one of the main pollutants generated by the refining and use of oil. To search bioremediation alternatives for these compounds, mainly in situ, considering the biotic and abiotic variables that affect the contaminated sites is determinant for the success of bioremediation techniques. In this study, bioremediation strategies were evaluated in situ, including biostimulation and bioaugmentation for 16 priority PAHs present in activated sludge farms. B. vietnamiensis G4 was used as a biodegradation agent for bioaugmentation tests. The analyses occurred for 12 months, and temperature and humidity were measured to verify the effects of these factors on the biodegradation. We used the technique GC–MS to evaluate and quantify the degradation of PAHs over the time of the experiment. Of the four treatments applied, bioaugmentation with quarterly application proved to be the best strategy, showing the degradation of compounds of high (34.4% annual average) and low (21.9% annual average) molecular weight. A high degradation rate for high molecular weight compounds demonstrates that this technique can be successfully applied in bioremediation of areas with compounds considered toxic and stable in nature, contributing to the mitigation of impacts generated by PAHs.

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Acknowledgements

We gratefully acknowledge the Coordenação de Aperfeiçoamento Pessoal de Nível Superior (CAPES, Brazil) for research grants and fellowships in support of this study, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for research grants to VHV (308996/2017-8) and Programa de Pós-Graduação em Biologia (UNISINOS). We thank the Companhia Riograndense de Saneamento (CORSAN), for providing samples and laboratory equipment for the realization of this study. Special thanks to Eshwar Mahenthiralingam, PhD from the Cardiff School of Biosciences, Cardiff University, UK, for providing the Burkholderia vietnamiensis G4 strain that we used in the work. Credit to the operators of the Laboratory of Genetics and Molecular Biology (LGBM/UNISINOS).

Funding

The work had financial support from the Companhia Riograndense de Saneamento (CORSAN) for the acquisition of some laboratory equipment and consumables that helped carry out this study. In addition, the Coordenação de Aperfeiçoamento Pessoal de Nível Superior (CAPES, Brazil) provided the scholarship for a PhD student. All other costs were financed from the project coordinator’s own funds.

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Correspondence to Victor Hugo Valiati.

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Cauduro, G.P., Marmitt, M., Ferraz, M. et al. Burkholderia vietnamiensis G4 as a biological agent in bioremediation processes of polycyclic aromatic hydrocarbons in sludge farms. Environ Monit Assess 195, 116 (2023). https://doi.org/10.1007/s10661-022-10733-1

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  • DOI: https://doi.org/10.1007/s10661-022-10733-1

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