In an effort to increase the rate of generation of foam in the
reactors, argon was bubbled through a diffuser that is positioned
directly beneath the hole in the grounded ring electrode
(Fig. 3(f)–(i)). This resulted in more foam on the surface, and significantly
increased the removal efficiency for all of the reactors
except the turbulent jet reactor (Fig. 10). While bubbling argon
has a comparable effect on the RVC HV, laminar jet, and gas discharge
reactors, it has no significant effect on the turbulent jet