Colloidal Gas Aphrons (CGAs) are microbubbles with colloidal properties which were first introduced by Sebba in 1971. The spherical bubbles are typically 10-100 mm in diameter and consist of a gaseous inner core surrounded by a thin aqueous surfactant film composed of at least two surfactant layers and an outer electrical layer. CGAs are produced by intense stirring of a surfactant solution at the speed of (6000-8000 rpm). This, leads to entraining air and finally micro bubble formation. When CGA produced, volume almost triples; therefore 65-70% volume fraction of suspension consists of air. This property makes CGA the third lightest fluids after hydrogen and helium. CGAs separate easily from bulk liquid and transform into a clear solution at the bottom and foamy suspension at the top during drainage process. Due to CGA structure and size distribution, they exhibit high stability, and can be transferred by Peristaltic pump to the end point of use. Their high interfacial area makes them efficient in separation processes. Several applications have been proposed and studied for CGA like: firefighting, biotechnology, waste treatment, heavy metal removal, protein recovery, bioremediation, flotation, enhancement in mass transfer, well bore drilling fluid, and tissue engineering. Drainage is a popular method for characterization of CGA dispersion. In this technique, the variation of drained liquid volume with time is measured. This measurements results in a drainage curve mainly composed of two distinct stages. The first stage accounts for removal of more than 90% of bulk liquid. The second stage through which foam films gradually rupture and bubbles collapse is slow due to capillary pressure control and plateau border suction. The deficiency of this method is that although the second stage is very time taking, but it is not informative for characterization of CGA dispersion in conventional drainage measurement. In this dissertation, characterization and potential application of CGAs have been investigated. A novel technique is proposed in this dissertation for CGA characterization using integrated and differentiated electrical conductivity measurements. In comparison with conventional drainage mechanism, differentiated EC approach depicts three stages, which are: initial low EC stage, constant EC stage and final rising EC stage. Surfactant concentration measurements have also been done and the results support electrical conductivity data. In addition, in this work, potential application of CGAs in recovery of glucoamylase enzyme from biomass was studied. Two different experimental methods were applied. Cationic and anionic surfactants were tested for a pH range. Integrated method revealed better separation efficiency for cationic surfactants.