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Impact of biodiesel on biodeterioration of stored Brazilian diesel oil
Authors:Francielle BückerNaiara Aguiar Santestevan  Luiz Fernando RoeschRodrigo J Seminotti Jacques  Maria do Carmo Ruaro PeralbaFlávio Anastácio de Oliveira Camargo  Fátima Menezes Bento
Institution:
  • a Departament of Microbiology, Federal University of Rio Grande do Sul, Rua Sarmento Leite, No 500, 90050170 Porto Alegre, RS, Brazil
  • b Campus São Gabriel, Federal University of Pampa, Av. Antonio Trilha, 1847 São Gabriel, RS, Brazil
  • c Departament of Soils, Federal University of Santa Maria, Av. Roraima 1000, Santa Maria, RS, Brazil
  • d Department of Inorganic Chemistry, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500 Porto Alegre, RS, Brazil
  • e Departament of Soils, Federal de Agronomia, Federal University do Rio Grande do Sul. Av. Bento Gonçalves, 7712 Porto Alegre, RS, Brazil
  • Abstract:Alternative fuels are receiving considerable attention, especially biodiesel, which is recognized for its environmental benefits. One advantage is its biodegradability. However, biodegradability may allow the fuel to be more susceptible to microbial contamination, especially during storage. The susceptibility to biodeterioration of biodiesel, diesel, and diesel containing 5, 10, and 20% biodiesel was evaluated using fungi isolated from contaminated oil systems. Paecilomyces sp. produced the highest biomass in 20% and 100% biodiesel, while Aspergillus fumigatus grew best in pure biodiesel. Yeasts had the highest rates of degradation, especially Candida silvicola, with 100% degradation of all esters. Rhodotorula sp. showed greatest activity for C18:3 (linolenic acid), at 39.4%, followed by C18:1 (oleic acid) and C16 (palmitic acid), at 21% and 15%, respectively, after 7 days of incubation. The results are relevant for the resolution of the decade-long debate on the increase in diesel biodegradability due to the addition of biodiesel.
    Keywords:Biodegradation  Biodiesel blends  Diesel  Fungal growth  Storage
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