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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.
Highlights
Petroleum hydrocarbons represent one of the most abundant and most frequent pollutants onEarth
The aim of this study was to test, in a laboratory pot experiments emulating potential bulk treatments, different variants of bioremediation of soil from oil refinery contaminated by high concentrations of aliphatic petroleum hydrocarbons (C10 −C40 ~80 g·kg−1 dry weight)
In our case we started with massive repetitive bioaugmentation using Ochrobactrum sp. and Bacillus sp., microbial consortium routinely used in previous bioremediation applications, and compared them to biostimulation using BSM
Summary
Petroleum hydrocarbons represent one of the most abundant and most frequent pollutants on. Oil mining, transporting and processing are major sources of this pollution. Oil production tends to follow the rise in human population numbers so the future outlook of petroleum contamination is. Sci. 2018, 8, 1855 rather negative [1,2]. Modern bioremediation techniques represent both an environmentally friendly and economically feasible means of eliminating petroleum pollutants from soils and sludges [3,4,5]
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