Pseudomonas fluorescens: A Bioaugmentation Strategy for Oil-Contaminated and Nutrient-Poor Soil.
Bioremediation technology is one of the most profitable and sustainable strategies for remediating soils contaminated with hydrocarbons. This study focuses on assessing the influence of biostimulation and bioaugmentation with Pseudomonas fluorescens to contribute to the removal of total petroleum hydrocarbons (TPHs) of a soil. Laboratory studies were carried out (measurements of emitted CO2, surface tension, and residual TPH) to select the best bioaugmentation and biostimulation treatment. The sources of C, N, and P were glucose-yeast extract, NH4Cl-NaNO3, and K2HPO4-K3PO4, respectively. The effect of culture conditions on the reduction of TPH and respiratory activity was evaluated through a factorial design, 23, in a solid culture system. After 80 days of incubation, it was observed that treatments of yeast extract-NH4Cl-K2HPO4 (Y4) and glucose-NaNO3-K3PO4 (Y5) presented a higher level of TPH removal (20.91% and 20.00% degradation of TPH, respectively). Biostimulation favors the production of biosurfactants, indirectly measured by the change in surface tension in the soil extracts. The treatments Y4 and Y5 showed a lower change value of the surface tension (23.15 and 23.30 mN·m-1 at 25 °C). A positive correlation was determined between the change in surface tension and the removal of TPH; hence there was a contribution of the biosurfactants produced to the removal of hydrocarbons.
['Gutiérrez|Eduardo Jahir|EJ|', 'Abraham|María Del Rosario|MDR|', 'Baltazar|Juan Carlos|JC|', 'Vázquez|Guadalupe|G|', 'Delgadillo|Eladio|E|0000-0002-2004-5340', 'Tirado|David|D|0000-0001-7568-752X']
D001673:Biodegradation, Environmental D001682:Biological Availability D052918:Environmental Restoration and Remediation D006801:Humans D006838:Hydrocarbons D000078622:Nutrients D010578:Petroleum D011551:Pseudomonas fluorescens D012987:Soil D012988:Soil Microbiology D012989:Soil Pollutants
Pseudomonas fluorescens TPH surface tension biosurfactant bioavailability biodegradation