Degradation of tarballs using associated bacterial consortia

Area of Science:

• Marine microbiology
• Bioremediation
• Environmental science

Background:

• Tarballs, marine crude oil formations, pose environmental challenges.
• Microbial degradation of tarballs and their recalcitrant hydrocarbons is not well understood.
• Specific marine bacteria show potential for degrading crude oil components.

Purpose of the Study:

• To investigate the efficacy of bacterial consortia in degrading tarball components.
• To identify potent bacterial strains and consortia for tarball bioremediation.
• To quantify the degradation of n-alkanes and polycyclic aromatic hydrocarbons (PAHs) in tarballs.

Main Methods:

• Screening of 38 tarball-associated bacteria for crude oil degradation.
• Selection of four promising strains: Alcanivorax sp. Betul-O, Marinobacter sp. Betul-26, Pseudomonas sp. Betul-14, and Pseudomonas sp. Betul-M.
• Preparation and analysis of eleven bacterial consortia using gravimetric and GC-MS-MS methods to assess n-alkane and PAH degradation.

Main Results:

• Bacterial consortia achieved 53.69–97.78% depletion of n-alkanes and 22.78–61.98% depletion of PAHs within 45 days.
• A consortium of Pseudomonas sp. Betul-14, Pseudomonas sp. Betul-M, and Alcanivorax sp. Betul-O showed significant degradation, removing 97.78% of n-alkanes and 61.98% of PAHs.
• Gravimetric and GC-MS-MS analyses confirmed the degradation capabilities of the studied consortia.

Conclusions:

• Bacterial consortia, particularly those including Pseudomonas and Alcanivorax species, demonstrate high potential for tarball bioremediation.
• The study provides quantitative data on the degradation rates of n-alkanes and PAHs by specific marine bacterial consortia.
• Further research is needed to elucidate degradation products and pathways for optimized bioremediation strategies.