[10a-E310-2~3] 8.7 Plasma Electronics Invited Talk

10:15 AM - 11:00 AM JST(1:15 AM - 2:00 AM UTC)English Presentation

[10a-E310-2] [Invited Talk] The role of bubble hydrodynamics in plasma-based PFAS treatment

〇Selma Mededovic Thagard¹, Clay Davis¹, Thomas Holsen¹ (1.Clarkson University)

Keywords:

PFAS,plasma,bubbles

Per- and polyfluoroalkyl substances (PFAS) are persistent "forever chemicals" that resist conventional water treatment. Non-thermal atmospheric pressure plasma is an effective alternative, destroying PFAS at the plasma–liquid interface. Treatment efficiency depends on how well PFAS are transported to this interface — a process governed by bubble hydrodynamics. This work examines how solution electrical conductivity controls bubble size, gas holdup, and gas–liquid interfacial area in a plasma bubbling column reactor, and how these hydrodynamic parameters relate to PFOA degradation and mineralization. Increasing conductivity from 0.2 to 10 mS/cm increased the degradation rate constant by 103% and fluoride yield by 40%, with performance correlating linearly with initial interfacial area and charge per discharge pulse. The initial gas–liquid interfacial area is proposed as a composite hydrodynamic descriptor capturing coupled mass-transfer and discharge-energy effects, with direct relevance to high-conductivity waste streams such as ion-exchange brines and membrane concentrates.