Abstract
Flotation of microorganisms by colloidal gas aphrons (CGAs) is recognised as an inexpensive and effective method of separation. CGAs are micro-sized gas bubbles of 25 μm in average diameter and each is encapsulated in an aqueous shell of surfactant solution. High flotation efficiency can be achieved when colloidal gas aphrons are employed in a dilute suspension containing yeast cells. Under certain experimental conditions, the adsorption of yeast on the aphrons follows the Langmuir model. With changes in the pH and feed concentration, the mechanism of bubble attachment and detachment changes from a monolayer to a multilayer adsorption.
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