Sezen BİLEN ÖZYÜREK, Nermin Hande AVCIOĞLU

The Role of Aspergillus parasiticus NRRL:3386 Strain onPetroleum Biodegradation and Biosorption Processes

Objective: Fungi play an important role in the removal of hazardous organic compounds from the environment with their extracellular multiple enzyme systems. In the bioremediation processes, fungi act as a bioreactor by breaking down or are biosorbent by accumulating organic pollutants.Materials and Methods: The aim of this study was to investigate and to compare the biodegradation and biosorption capacities of different amounts of live and dead biomasses and different concentrations of culture supernatants of Aspergillus parasiticus NRRL:3386 with gravimetric, gas chromatography-mass spectrometry (GC/MS) and scanning electron microscope (SEM) analyses.Results: This study indicated that 1 g of live biomass degraded 80% of petroleum within 4-days of incubation. The cellfree culture supernatant was not as effective as the live biomass in petroleum degradation. The petroleum biosorption was achieved at over 50% by 1 g and 2.5 g; over 70% by 5 g and 7.5 g, and over 80% by 10 g of dead biomasses. The petroleum removal efficiencies of 2 g of live and 10 g of dead biomasses were over 80%. GC/MS analysis demonstrated that $C_10$-$C_18$n-alkanes (except $C_11$ and $C_13$) and $C_11$, $C_13$, $C_19$-$C_26$ n-alkanes were degraded 47-77% and over 80%, respectively. The moststriking result was that $C_27$-$C_33$ n-alkanes were efficiently degraded over 90% in a short incubation period. SEM analysis showed that gaps between fungal hyphae were clear and bright before biosorption of petroleum, whereas gaps between fungal hyphae were closed after biosorption of petroleum.Conclusion: The results clearly pointed out that A. parasiticus will make a significant contribution to advanced mycoremediation studies.

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