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Evaluation of Aspergillus flavus Growth on Weathered HDPE Plastics Contaminated with Diesel Fuel

Summary

Diesel storage tanks made from plastic accumulate stubborn hydrocarbon residues that are difficult to clean using traditional methods. Scientists discovered that a common fungus called Aspergillus flavus can effectively grow on and potentially help break down these diesel-contaminated plastics, especially when the diesel has aged for years and is exposed to warmer temperatures. This research suggests fungi could offer an environmentally friendly way to clean up contaminated plastic waste from fuel storage.

Background

Plastic containers used for diesel storage represent an environmental challenge due to hydrocarbon retention and weathering. Conventional cleaning methods transfer contamination to wastewater rather than eliminating it. Bioremediation using filamentous fungi offers a sustainable alternative to physico-chemical treatment methods.

Objective

This study evaluates the capacity of Aspergillus flavus to colonize and grow on HDPE surfaces contaminated with weathered and fresh diesel residues. The research aims to identify environmental and experimental conditions that enhance fungal adaptation for potential biocleaning applications.

Results

Robust fungal growth occurred on weathered diesel-contaminated gray HDPE at 30°C, with colony areas exceeding 350 mm² and halos over 3000 mm². Non-weathered white HDPE with fresh diesel showed limited growth. Incubation temperature significantly influenced fungal development, with 30°C producing optimal growth on weathered substrates.

Conclusion

A. flavus demonstrates potential as an agent for fungal-based biocleaning of diesel-contaminated HDPE plastics, particularly on weathered substrates at elevated temperatures. The study provides a framework for developing sustainable bioremediation strategies targeting diesel-contaminated plastic waste.
  • Published in:Microorganisms,
  • Study Type:Experimental Study,
  • Source: PMID: 40572306
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