Biodegradation Aromatic Hydrocarbons of Naphthalene by Aspergillus flavus and Penicillium fumigates
Abstract
Filamentous fungi were identified in the soil that had been contaminated by petroleum hydrocarbon and wastewaters released by the oil refinery of Nasiriyah in East part of the Nasiriyah city and Nasiriyah oil field (Al-Kati’a) by using dilution method. The study demonstrated a strong capability of Aspergillus flavus and Penicillium fumigatus to remove aromatic hydrocarbons, specifically Naphthalene. The biodegradation process was carried out under optimized conditions, using various concentrations of Naphthalene. The findings revealed that Aspergillus flavus and Penicillium fumigatus were the highest frequently isolated fungi, with Aspergillus flavus showing a 100% occurrence rate and Penicillium fumigatus 97%. Both fungi were exposed to petroleum hydrocarbons in both solid and liquid media and successfully demonstrated the capacity for degradation Naphthalene. Their colony diameters were measured on solid media, confirming their adaptability and growth in the presence of Naphthalene. Both fungi were capable of degrading Naphthalene at a concentration of 50 ppm. The degradation products and residual Naphthalene levels were identified using Fourier-transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS). The results of statistical analysis showed that the two fungi’s performance differed significantly.
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