Quantification of foaming behaviour using foam index

The factors influencing foam index were identified and their effects on foa m index were investigated. It was noted that increasing the diameter of the flotation cell led to an increase in foam index. The maximum foam index wa s found to occur at a constant air/solids ratio when MLSS was varied with t ime of aeration or airflow. A good degree of correlation was also obtained between filament count and foam index. A small concentration of Surfactants was sufficient to induce foaming. However, further increase in surfactants showed relatively little influence on Foam Index.