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TESTING THE MYCOREMEDIATION OF POLYCYCLIC AROMATIC HYDROCARBONS IN POWER PLANT ASH USING OYSTER MUSHROOM
Abstract
Ash accumulating in a power plant-s ash pond represents a significant environmental burden for both nature and the people living nearby. For several years, we have been exploring the potential use of fungi, particularly the oyster mushroom (Pleurotus ostreatus), in the remediation and filtration process to ultimately achieve the revitalization of the ash pond site. The ash is mixed into a substrate based on European beech (Fagus sylvatica) wood chips, with the addition of two production strains of oyster mushroom. We analysed the substrate overgrown by the fungal mycelium as well as the fruiting bodies that grew from the same substrate The current phase of research focuses on analysing the content of polycyclic aromatic hydrocarbons (PAHs) in ash that has been stored long-term in the ash pond ("wet ash") and in freshly produced ash from burning solid fuel in the power plant ("dry, fresh ash"). The presence of PAHs was determined using -H NMR analysis. Based on hydrogen spectra measurements, we obtained several findings essential for further research. The ash from the ash pond (X1) contained no aromatic compounds, whereas dry, fresh ash (X2) exhibited signals in the aromatic region, confirming their presence. The substrate with dry ash, overgrown by oyster mushroom strain n. 272 (S1), contained aromatic compounds. However, substrates with separately both wet and dry ash overgrown by strain X12 (S2 and S3) showed no signals in the aromatic region. Strain X12 is capable of absorbing and mobilizing PAHs from the substrate into its fruiting bodies, its presence thus having a positive mycoremediation effect.
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