Diesel biodegradation by biosurfactant producing Paenibacillus strains

Area of Science:

• Environmental Microbiology
• Bioremediation Technologies
• Bacterial Physiology

Background:

• Petroleum contamination poses significant environmental challenges.
• Developing sustainable and cost-effective remediation strategies is crucial.
• Biosurfactant-producing bacteria offer a promising avenue for bioremediation.

Purpose of the Study:

• To investigate the potential of Paenibacillus strains for biosurfactant production and hydrocarbon degradation.
• To evaluate the efficacy of a Paenibacillus consortium for diesel-contaminated soil remediation.

Main Methods:

• Screening of eight Paenibacillus strains for biosurfactant production (emulsification activity, surface tension reduction).
• Hydrocarbon degradation assays and identification of potent strains.
• Optimization of a bacterial consortium (P. chitinolyticus and P. castaneae) using response surface methodology for diesel degradation.
• Laboratory-scale soil bioremediation experiments monitored by gas chromatography.

Main Results:

• Paenibacillus chitinolyticus, P. borealis, and P. castaneae exhibited high emulsification activity and index.
• Several strains, including P. castaneae and P. chitinolyticus, reduced surface tension below 40 mN/m.
• Optimized consortium achieved 34.63% diesel degradation in 10 days under specific conditions.
• Laboratory soil bioremediation demonstrated 44.78% diesel degradation over three months.

Conclusions:

• Paenibacillus strains, particularly P. chitinolyticus and P. castaneae, are effective biosurfactant producers and hydrocarbon degraders.
• The developed bacterial consortium shows significant potential for the bioremediation of diesel-contaminated soils.
• This study presents a novel application of Paenibacillus species in environmental cleanup.