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Abstract
The anionic (sodium tetrapropylenebenzenesulfonate, Nansa HS-55) and nonionic (polyethoxylated alkylphenol, Alfenol) detergents were removed by the foaming method. It was found that there is a possibility of improving the foaming effect of a nonionic detergent by the introduction of a feeding solution into the foam phase. As far as an anionic detergent is concerned, the influence of the kind of feeding was minor in the case of aqueous solutions as well as with those containing sodium chloride. A simple graphic method is presented for the determination of the number of the foaming processes or the number of columns which are to be used in order to obtain the required detergent removal effect.