Heavy metals species affect fungal-bacterial synergism during the bioremediation of fluoranthene

The co-occurrence of polycyclic aromatic hydrocarbons (PAHs) with heavy metals (HMs) is very common in contaminated soils, but the influence of HMs on fungal-bacterial synergism during PAH bioremediation has not been investigated. The bioremediation of fluoranthene-contaminated sand using co-cultures of Acremonium sp. P0997 and Bacillus subtilis showed increases of 109.4 and 9.8 % in degradation compared to pure bacterial and fungal cultures, respectively, removing 64.1 ± 1.4 % fluoanthene in total. The presence of Cu2+ reduced fluoranthene removal to 53.7 ± 1.7 %, while inhibiting bacterial growth, and reducing translocation of bacteria on fungal hyphae by 49.5 %, in terms of the bacterial translocation ratio. Cu2+ reduced bacterial diffusion by 46.8 and 31.9 %, as reflected by D (a bulk random motility diffusional coefficient) and Deff (the effective one-dimensional diffusion coefficient) compared to the control without HM supplementation, respectively. However, Mn2+ resulted in a 78.2 ± 1.9 % fluoranthene degradation, representing an increase of 21.9 %, while enhancing bacterial growth and bacterial translocation on fungal hyphae, showing a 12.0 % increase in translocation ratio, with no observable impact on D and Deff. Hence, the presence of HMs has been shown to affect fungal-bacterial synergism in PAH degradation, and this effect differs with HM species. © 2016, Springer-Verlag Berlin Heidelberg.

• Autores: Daugulis, Andrew J.; Ma, Xiaokui; Ding, Ning; Peterson, Eric Charles
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2016
• Institución: Universidad ICESI
• Repositorio: Repositorio ICESI
• Idioma: eng
• OAI Identifier: oai:repository.icesi.edu.co:10906/81756
• Acceso en línea: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84968626476&doi=10.1007%2fs00253-016-7595-4&partnerID=40&md5=06f158adfbbf19b7b78292eccc00a3f9; http://hdl.handle.net/10906/81756; http://dx.doi.org/10.1007/s00253-016-7595-4
• Palabra clave: Production engineering; Bioremediation; Ingeniería de producción; Metales pesados; Biorremediación
• License: https://creativecommons.org/licenses/by-nc-nd/4.0/