Time-Dependent Foam Flotation Stripping Column Operation

Abstract A mathematical model for the time-dependent operation of a foam flotation stripping column is presented. Solute and solvent balances are developed for the stripping and foam drainage sections of the column, and a Langmuir isotherm is assumed for the surface-active solute. Results of computations with the model illustrate the dependence of column performance on influent and air flow rates, pulse hydraulic and solute concentrations, bubble size, and column geometry. Boundary layer theory is used to calculate the efficiency of foam flotation from a pool of liquid as a function of bubble size.