Enhanced biodegradation of perfluorooctanoic acid in a dual biocatalyzed microbial electrosynthesis system

The toxic perfluorooctanoic acid (PFOA) is widely spread in terrestrial and aquatic habitats owing to its resistance to conventional degradation processes. Advanced techniques to degrade PFOA requires drastic conditions with high energy cost. In this study, we investigated PFOA biodegradation in a s...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2023-07, Vol.328, p.138584-138584, Article 138584
Main Authors: Tahir, Khurram, Ali, Abdul Samee, Kim, Jinseob, Park, Juhui, Lee, Seongju, Kim, Bolam, Lim, Youngsu, Kim, Gyuhyeon, Lee, Dae Sung
Format: Article
Language:English
Subjects:
Bioanode
Biodegradation
Biodegradation, Environmental
Caprylates - metabolism
Fluorocarbons - metabolism
Microbial electrosynthesis system
PFAS
PFOA
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Summary:The toxic perfluorooctanoic acid (PFOA) is widely spread in terrestrial and aquatic habitats owing to its resistance to conventional degradation processes. Advanced techniques to degrade PFOA requires drastic conditions with high energy cost. In this study, we investigated PFOA biodegradation in a simple dual biocatalyzed microbial electrosynthesis system (MES). Different PFOA loadings (1, 5, and 10 ppm) were tested and a biodegradation of 91% was observed within 120 h. Propionate production improved and short-carbon-chain PFOA intermediates were detected, which confirmed PFOA biodegradation. However, the current density decreased, indicating an inhibitory effect of PFOA. High-throughput biofilm analysis revealed that PFOA regulated the microbial flora. Microbial community analysis showed enrichment of the more resilient and PFOA adaptive microbes, including Methanosarcina and Petrimonas. Our study promotes the potential use of dual biocatalyzed MES system as an environment-friendly and inexpensive method to remediate PFOA and provides a new direction for bioremediation research. [Display omitted] •91% PFOA biodegradation via dual biocatalyzed microbial electrosynthesis in 120nullh.•PFOA inhibited microbial growth and current density.•PFOA regulated microbial flora and enriched PFOA-resistant microbes.•Propionic acid production improved and short carbon chain intermediates detected.•Methanosarcina and Petrimonas growth highest in PFOA-exposed biofilm.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2023.138584