Two cyanobacterial isolated strains were used to evaluate their biodegradation efficiency for petroleum hydrocarbons, Oscillatoria agardhii (non-heterocystis) and Anabaena spharica (heterocystis). Both cyanobacterial strains revealed a high algal biomass (expressed as chlorophyll "a" w g/l) in comparison with that obtained by the control culture. The n-alkanes (C 10 - C 24 ) were more readily degraded than polycyclic aromatic hydrocarbons (PAHs) by both strains. On the other hand, n-alkanes were reduced to 99.5% and PAHs to 97.5% in Anabaena culture. Significant (p < 0.05) negative correlation was observed between the microbial growth of Anabaena and the total concentration of petroleum hydrocarbons. The biodegradation rate of saturated and aromatic fractions was timedependent depending according to the cyanobacterial strains.
International Journal of Environmental Studies
Volume 60, 2003 - Issue 5
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