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Bioremediation of Diesel-Contaminated Soil by Fungal Solid-State Fermentation.

Authors :: Bai Y
Liang H
Wang L
Tang T
Li Y
Cheng L
Gao D
Source :: Bulletin of environmental contamination and toxicology [Bull Environ Contam Toxicol] 2023 Dec 16; Vol. 112 (1), pp. 13. Date of Electronic Publication: 2023 Dec 16.
Publication Year :: 2023
Abstract: To address the poor removal of diesel in soil by indigenous microorganisms, we proposed a fungal solid-state fermentation (SSF) method for bioremediation. We screened Pycnoporus sanguineus 5.815, Trametes versicolor 5.996, and Trametes gibbosa 5.952 for their diesel-degrading abilities, with Trametes versicolor 5.996 showing the most promise. The fungal inoculum was obtained through SSF using wood chips and bran. Trametes versicolor 5.996 was applied to two treatments: natural attenuation (NA, diesel-contaminated soil) and bioremediation (BR, 10% SSF added to diesel-contaminated soil). Over 20 days, NA removed 12.9% of the diesel, while BR achieved a significantly higher 38.3% degradation rate. BR also increased CO <subscript>2</subscript> and CH <subscript>4</subscript> emissions but reduced N <subscript>2</subscript> O emissions. High-throughput sequencing indicated SSF significantly enriched known diesel-degrading microorganisms like Ascomycota (83.82%), Proteobacteria (46.10%), Actinobacteria (27.88%), Firmicutes (10.35%), and Bacteroidota (4.66%). This study provides theoretical support for the application of fungal remediation technology for diesel and improves understanding of microbiologically mediated diesel degradation and soil greenhouse gas emissions.<br /> (© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)