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The use of biodegradation as a method for cleaning up soil that has beencontaminated by spilt petroleum can be an effective strategy. So, this studyinvestigated the existence of the wild microorganism in soil contaminated withoil and study their ability to degrade petroleum in vitro. Nineteen sampleswere collected from various locations near Taq Taq (TTOPCO) natural seeps inthe Kurdistan Region of Iraq. Morphological, cultural, biochemical tests andmolecular identification were used to identify the microbial communities, inaddition, spore texture and the colour of the fungal isolates were investigatedon the fungal isolates. Out of the19 samples, 17 indigenous bacterial strainsand 5 fungal strains were successfully isolated. From the absorptionspectrophotometry, Bacillus anthracis, Bacillus cereus, Achromobacter sp. andPseudomonas aeruginosa for the bacterial isolates grew well on a minimal saltmedium supplemented with 1% crude oil. Results showed that these isolatesmentioned above had a strong ability to degrade crude oil by reducing thecolour of 2,6-dichlorophenol indophenol (DCPIP) from deep blue to colourless.However, for the fractions of hydrocarbon, the bacterial isolates failed anddid not affect the colour of any of the fractions. The results for fungi showedthat Aspergillus lentulus and Rhizopus arrhizus had a strong ability to degradeboth crude oil and fraction F1 by reducing the colour of DCPIP. Each fungalisolates also had a great tolerance to different concentrations of crude oilwhen grown on solid MSM. This study showed these microorganisms have a strongability to degrade crude oil and can be used to clean up soil and theenvironment.

Degradation of crude oil and pure hydrocarbon fractions by some wild bacterial and fungal species