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Area of Science:

  • Environmental Chemistry
  • Chemical Engineering
  • Combustion Science

Background:

  • Per- and poly-fluorinated alkyl substances (PFAS) are persistent environmental contaminants due to their chemical and thermal stability.
  • Conventional thermal treatment methods for organic waste may struggle to achieve complete PFAS destruction.
  • Understanding PFAS degradation pathways is crucial for developing effective waste management strategies.

Purpose of the Study:

  • To modify a combustion model for simulating C1-C3 fluorinated organic reactions, specifically focusing on PFAS destruction.
  • To predict the destruction efficiency (DE) and formation of products of incomplete combustion (PICs) for CF4, CHF3, and C2F6.
  • To compare model predictions with experimental measurements from a pilot-scale research combustor.

Main Methods:

  • A modified combustion model incorporating NIST-compiled kinetics for C1-C3 fluorinated organics was employed.
  • A simplified plug flow reactor model was used to simulate PFAS destruction under various time-temperature profiles.
  • Fourier Transform Infrared (FTIR) spectroscopy was used to measure PFAS DE and PICs in a pilot-scale natural gas-fired furnace.

Main Results:

  • CF4 exhibited lower DEs (60-95%) compared to CHF3 and C2F6 (>99%), indicating its resistance to thermal destruction.
  • CHF3 and C2F6 were more readily destroyed due to the presence of weaker C-H and C-C bonds, but could form fluorinated PICs.
  • Model predictions generally agreed with experimental DEs for CHF3 and C2F6, but showed discrepancies for CF4 at different temperatures.

Conclusions:

  • Complete thermal destruction of all studied PFAS, particularly CF4, remains challenging.
  • The formation of fluorinated PICs is a concern even when high DEs are achieved.
  • The developed model and FTIR measurements provide valuable tools for assessing PFAS destruction and informing waste management strategies.