Isolation and Degradation Characteristics of PBAT Film Degrading Bacteria

Area of Science:

• Microbiology
• Polymer Science
• Environmental Science

Background:

• Polybutylene adipate-co-terephthalate (PBAT) is a widely used biodegradable mulching film in agriculture.
• Efficient biodegradation of PBAT is crucial for sustainable agricultural practices and reducing plastic waste.

Purpose of the Study:

• To screen and isolate effective PBAT-degrading bacteria from soil.
• To optimize the degradation conditions for a highly efficient bacterial strain.
• To elucidate the mechanism of PBAT biodegradation.

Main Methods:

• Screening of soil bacteria using PBAT film as the sole carbon source.
• Isolation and identification of PBAT-degrading bacteria using 16S rDNA sequence analysis.
• Optimization of cultivation conditions (nitrogen source, pH, inoculum volume).
• Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX) for degradation analysis.

Main Results:

• Five potential PBAT-degrading bacterial strains were screened.
• Peribacillus frigoritolerans S2313 (JZ1) was identified as a highly efficient degrader.
• Optimized conditions resulted in a 12.45% degradation rate of PBAT film after 8 weeks.
• SEM-EDX analysis indicated that biodegradation involves an oxidation process, primarily affecting amorphous regions of the PBAT film.

Conclusions:

• Peribacillus frigoritolerans JZ1 demonstrates significant potential for PBAT biodegradation.
• Optimized cultivation conditions enhance the degradation efficiency of the isolated strain.
• Microbial degradation of PBAT is an oxidative process targeting amorphous regions.
• This study offers a promising biological approach for managing PBAT film degradation in agricultural settings.