Feasibility of Solid-State Fermentation Using Spent Fungi-Substrate in the Biodegradation of PAHs



The ability of Trametes versicolor and Pleurotus ostreatus to grow on agroindustrial wastes, such as orange peels, and to degrade model polycyclic aromatic hydrocarbons (PAHs) in solid-state fermentation (SSF) was evaluated. Best results in laccase production were obtained with T. versicolor cultures (3000 U L−1), however, P. ostreatus (2700 U L−1) showed higher ability to degrade the tested PAHs phenanthrene (PHE) and pyrene (PYR). Moreover, orange peels can be used as biofertilizer and the oxidative ability of the spent fungus and substrate obtained in SSF can be used in the remediation of polluted soil. The results obtained confirm this hypothesis. Thus, the decontamination achieved in soils polluted with PYR was around 43% (after 30 days) by addition of spent fungus and substrate from SSF.