AI Article Synopsis
- The study examined bioremediation methods for polychlorinated biphenyls (PCBs) in soil using three strategies: mycoaugmentation with specific fungi, biostimulation with sugarcane bagasse, and natural attenuation without amendments.
- Both mycoaugmentation and biostimulation showed significant effectiveness, removing approximately 90% of PCBs and reducing toxicity in the soil over 90 days.
- The results indicated that sugarcane bagasse serves as an effective support for fungal growth and improves soil quality while highlighting mycoaugmentation and biostimulation as viable solutions for cleaning up PCB-contaminated soils.
Article Abstract
The aim of this study was to investigate the bioremediation potential of polychlorinated biphenyls (PCBs) in soil, mimicking three strategies: (a) mycoaugmentation: by the addition of Trametes sanguinea and Pleurotus sajor-caju co-cultures immobilized on sugarcane bagasse; (b) biostimulation: by supplementation of sugarcane bagasse; and (c) natural attenuation: no amendments. The experiments were done in microcosms using Ultisol soil. Remediation effectiveness was assessed based on pollutants content, soil characteristics, and ecotoxicological tests. Biostimulation and mycoaugmentation demonstrated the highest PCBs-removal (approx. 90%) with a significant toxicity reduction at 90 d. The studied strains were able to survive during the incubation period in non-sterilized soil. Laccase, manganese-peroxidase and endoxylanase activities increased significantly in co-cultures after 60 d. Sugarcane bagasse demonstrated to be not only a suitable support for fungal immobilization but also an efficient substrate for fungal colonization of PCBs-contaminated soils. Mycoaugmentation and biostimulation with sugarcane bagasse improved oxidable organic matter and phosphorous contents as well as dehydrogenase activity in soil. Therefore, biostimulation with sugarcane bagasse and mycoaugmentation applying dual white-rot fungal cultures constitute two efficient bioremediation alternatives to restore PCBs-contaminated soils.
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| http://dx.doi.org/10.1016/j.ecoenv.2020.110929 | DOI Listing |
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