Colloidal gas aphrons (CGAs) are micron-sized bubbles, which are produced b
y stirring a dilute surfactant solution at a high speed. In this work, CGAs
have been used to clarify oily wastewater by flotation technique. The CGAs
sparging rate was a critical factor that governed the efficiency of the pr
ocess. A model for the determination of the mass transfer coefficient is al
so developed for the purpose of process design.