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Advisor(s)
Abstract(s)
Purpose Polycyclic aromatic hydrocarbons (PAHs) are a class
of organic compounds commonly found as soil contaminants.
Fungal degradation is considered as an environmentally
friendly and cost-effective approach to remove PAHs from
soil. Acenaphthylene (Ace) and Benzo[a]anthracene (BaA)
are two PAHs that can coexist in soils; however, the influence
of the presence of each other on their biodegradation has not
been studied. The biodegradation of Ace and BaA, alone and
in mixtures, by the white rot fungus Pleurotus ostreatus was
studied in a sandy soil.
Materials and methods Experimental microcosms containing
soil spiked with different concentrations of Ace and BaAwere
inoculated with P. ostreatus. Initial (t 0) and final (after 15 days
of incubation) soil concentrations of Ace and BaA were determined
after extraction of the PAHs.
Results and discussion P. ostreatus was able to degrade
57.7% of the Ace in soil spiked at 30 mg kg−1 dry soil and
65.8% of Ace in soil spiked at 60 mg kg−1 dry soil. The
degradation efficiency of BaA by P. ostreatus was 86.7 and
77.4% in soil spiked with Ace at 30 and 60 mg kg−1 dry soil,
respectively. After 15 days of incubation, there were no significant
differences in Ace concentration between soil spiked
with Ace and soil spiked with Ace + BaA, irrespective of the
initial soil concentration of both PAHs. There were also no
differences in BaA concentration between soil spiked with
BaA and soil spiked with BaA + Ace.
Conclusions The results indicate that the fungal degradation
of Ace and BaA was not influenced by the presence of each
other’s PAH in sandy soil. Bioremediation of soils contaminated
with Ace and BaA using P. ostreatus is a promising
approach to eliminate these PAHs from the environment.
Description
Keywords
Acenaphthylene Benzo[a]anthracene Biodegradation PAHs mixtures Pleurotus ostreatus Polycyclic aromatic hydrocarbons (PAHs)