Treatment Train for In Situ Mineralization of PFOS using Heat-Activated Persulfate Oxidation (HAPO)
Abstract
This project was in response to the ERSON-20-C1 objective of improving understanding of biodegradation processes that could lead to PFAS biological treatment as part of a treatment train. Our aim was to develop a novel proof-of-concept in situ treatment train to mineralize PFOS, by first transforming PFOS with a laccase-mediator system (LMS), an enzyme-based treatment method, and then subjecting transformation products to heat-activated persulfate oxidation (HAPO), a chemical treatment method. We considered that a dual-pronged treatment approach could address the challenges of treating complex mixtures of PFAS at aqueous-film forming (AFFF)-impacted DoD sites; namely, the initial bio-transformation step of perfluorooctane sulfonic acid (PFOS), which is notoriously difficult to treat in situ. Our objectives were to 1) Identify laccase-mediator systems that could quickly transform PFOS; 2) Quantify and characterize the transformation products formed during laccase-mediator reactions; and 3) Evaluate the mineralization of transformation products by HAPO. In addressing these objectives, we sought to validate and optimize a treatment train approach for complex AFFF contaminated matrices.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 2023
- Accession Number
- AD1221387
Entities
People
- David L. Sedlak
- Emily Cook
- Fuhar Dixit
- Lisa Alvarez-cohen
- Sophia Steffens
Organizations
- University of California, Berkeley