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Sustainable Approach for Degradation of Low-Density Polyethylene Plastic Waste Using Ligninolytic White Rot Fungus. | LitMetric

AI Article Synopsis

  • * The study achieved an impressive 98.73% BPA degradation using specific enzyme concentrations and a nutrient-rich medium, ultimately leading to 100% degradation in different leachate sets within 5 days.
  • * Analysis showed physical and chemical changes in the degraded materials, and the treated leachate supported soil microbial growth, suggesting a potential for using this process in sustainable waste management and irrigation practices.

Article Abstract

Bisphenol A (BPA), an endocrine disruptor is used in manufacturing of polycarbonate plastics for food-drink packaging. In the present study, optimized set of conditions to degrade commercial grade BPA has been used and applied in degrading shredded leached low-density polyethylene (LDPE) residues and its leachate (198 µg/L BPA) using white rot fungus Hypocrea lixii. One-at-a-time method showed maximum BPA degradation of 98.73 ± 0.02% with 190.1 ± 0.2 U/L laccase and 1913.2 ± 0.3 U/L lignin peroxidase in glucose-yeast extract-malt extract-peptone (GYMP) medium supplemented with 5% sawdust, mediators-CuSO (0.2 mM), veratryl alcohol (0.1 mM) and Tween 80 (0.1 mM). Three sets were prepared by dissolving these optimized nutritional components in leachates-A (only leachate), B (leached LDPE residues in leachate) and C (leached LDPE residues, sawdust in leachate). All sets showed 100% degradation in 5 days. Cracks and holes in degraded LDPE pieces was confirmed by SEM analysis and changes in functional groups by FTIR. Toxicity assay of treated leachate on soil microfauna revealed the elimination of BPA as it supported sufficient microbial growth of soil bacteria. Thus, the present process provides a sustainable solution for the management of LDPE with the possibility of using treated leachate for irrigation.

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Source
http://dx.doi.org/10.1002/jobm.202400442DOI Listing

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