Abstract
Mycoremediation using white rot fungi is a sustainable method for treating PCDD/F-contaminated soil. In this study, five agricultural wastes were used to cultivate Phanerochaete chrysosporium (PC) and Pleurotus pulmonarius (PP), and after six days of submerged cultivation, mycelium-free liquids (MFLs) were obtained. These MFLs were then used to treat non-sterilized PCDD/F-contaminated soil (7100 ng I-TEQ/kg). The removal efficiencies were found to be comparable to those of a regular medium, with average efficiencies of ~45 % and 42 % for PC and PP, respectively, after 96 h. The highest removal efficiency reached 91 % and 55 % (mass and toxic concentrations) when the MFLs were induced with spent coffee grounds and green tea residue. The removal mechanism was found to be biased towards oxidation rather than dehalogenative reduction. Also, the addition of borate-fructose complex as a mediator increased the removal efficiency by 17 %. This method offers a promising and sustainable way to remediate PCDD/F-contaminated soil.
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