Biodegradation of Natural Rubber: Microcosm Study

Area of Science:

• Environmental Microbiology
• Biotechnology
• Polymer Science

Background:

• Natural rubber (NR) waste poses environmental challenges.
• Microbial degradation offers a sustainable solution for NR disposal.
• Identifying effective microbial consortia is crucial for biodegradation processes.

Purpose of the Study:

• To evaluate the biodegradation of natural rubber (NR) using a microbial consortium.
• To assess the influence of environmental factors on NR biodegradation.
• To provide data for scaling up NR biodegradation processes.

Main Methods:

• Incubation of soil microcosms with NR samples for 236 days.
• Monitoring biodegradation via respirometric analysis and dry weight loss.
• Microbiological counts and Scanning Electron Microscopy (SEM) for biomass analysis.

Main Results:

• Biodegradation microcosms showed significantly higher CO2 production compared to controls.
• A 15.6% dry weight loss of NR was observed in biodegradation microcosms.
• Aerobic biomass, particularly filamentous fungi, was identified as the primary agent of degradation.

Conclusions:

• The naturally selected microbial consortium can effectively biodegrade NR as a sole carbon source.
• Soil aeration and mixing enhance the biodegradation process.
• Findings offer valuable insights for optimizing NR biodegradation at a larger scale.