Biodegradation of High Concentrations of Aliphatic Hydrocarbons in Soil from a Petroleum Refinery: Implications for Applicability of New Actinobacterial Strains
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Date
2019-11-09
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
At present, there is great demand for new resistant and metabolically active strains of
biodegrading bacteria capable of degrading high concentrations of petroleum pollutants. In this
study, we undertook a series of pot-based biodegradation experiments on soil from a petroleum
refinery lagoon heavily polluted with aliphatic hydrocarbons (81.6 ± 2.5 g·kg−1 dry weight) and
metals. Periodical bioaugmentation with either a mixture of isolated degraders identified as Bacillus
sp. and Ochrobactrum sp. or biostimulation with nutrient medium, singly or in combination, did not
produce any significant decrease in hydrocarbons, even after 455 days. Inoculation with Gordonia
rubripertincta CWB2 and Rhodococcus erythropolis S43 in iron-limited media, however, resulted in a
significant decrease in hydrocarbons 45 days after bioaugmentation. These actinobacterial strains,
therefore, show significant potential for bioremediation of such highly polluted soils.
Description
Subject(s)
petroleum hydrocarbons decontamination, Bacillus, Ochrobactrum, Gordonia, Rhodococcus, siderophores