Effect of Salinity on Biodegradation of Polycyclic Aromatic Hydrocarbons (PAHs) of Heavy Crude Oil in Soil

Abstract

The spillage of crude oil in the soil damages the environment. Polycyclic aromatic hydrocarbons (PAHs) are one of the crude oil components that may be harmful for living organisms. PAHs can disappear from the environment by volatilization and biodegradation. The effect of different NaCl concentrations (0%-5%) on PAHs reduction from the heavy crude oil-contaminated soil was studied. Our results showed that increasing NaCl concentration in soil had decreasing effect on total crude oil and PAHs reduction. The biodegradation of total crude oil was higher in 0% NaCl (41%) while higher total PAHs reduction was observed in 1% NaCl (35%). The lower total crude oil and PAHs reduction were observed in 5% NaCl (12% and 8% respectively). Phenanthrene, anthracene and pyrene reduction were higher in 1% NaCl, while fluoranthene and chrysene reduction were higher in 0% NaCl.

Biodegradation of polycyclic aromatic hydrocarbon by a halotolerant bacterial consortium isolated from marine environment

“…To support the growth of bacterial cells, nutrients such as glucose, yeast extract and acetate were added. Tehrani et al (2009) reported the effect of salinity on biodegradation of PAHs of heavy crude oil. Head et al (2006) described the importance of additional nutrients in the bioremediation of petroleum hydrocarbons.…”

Characterization of Oil-Degrading Bacteria from Oil-Contaminated Soil and Activity of their Enzymes

“…At present, microbial remediation of oil contaminated soil has been carried out and widely reported in the world (7,16,23,26), which provides a reference and guidance for development and practical application of bioremediation technology. in this research, 10 natural bacterial strains were isolated from oil contaminated soil from the Daqing oilfield in northern China, and identified by 16S rDNA sequence analysis combined with morphological observation, physiological and biochemical tests.…”

Degradation of Anthracene by Alkaliphilic Bacteria Bacillus badius

“…aeruginosa isolate 312A had the highest rate of degradation 71% after 48 days at pH 7.0 at 30ºC. (Dariush et al, 2009) reported that total PAHs (phenanthrene, anthracene and pyrene) degradation was observed in 1% NaCl (35%).…”