OLIVERA nelda Lila
Biosurfactant-enhanced degradation of residual hydrocarbons from ship bilge wastes.
NELDA LILA OLIVERA; MARTA COMMENDATORE,; ANA MORÁN,; LUIS ESTEVES, JOSÉ
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
Lugar: Berlin; Año: 2000 vol. 25 p. 70 - 70
The use of Bacillus subtilis O9 biosurfactant (surfactin) and of bioaugmentation to improve the treatment of residual hydrocarbons from ship bilge wastes was studied. A biodegradation experience was conducted in aquaria placed outdoors, and under no-sterile conditions. Three treatments were examined: culture medium plus bilge wastes, bioaugmentation with microorganisms from bilge wastes, and bioaugmentation plus biosurfactant. Samples were analized for viable counts, aliphatic and aromatic hydrocarbon concentrations, n-C17/Pri and n-C18/Phy ratios. While the addition of biosurfactant stimulated hydrocarbon degradation, bioaugmentation did not produce any remarkable effect. At day 10 the remaining percentages of aliphatic and aromatic hydrocarbons in biosurfactant aquaria were 6.8 and 7.2, respectively, while it took 20 days to reach comparable results in the other treatments. Biosurfactant did not affect the preferential biodegradation of n-C17 and n-C18 over pristane and phytane. This biosurfactant, which may be produced in a relatively simple and inexpensive process, is a promising alternative in the optimization of hydrocarbon waste treatment.