Zinc was removed from simulated industrial wastewater in a pilot scale foam flotation plant. Sodium lauryl sulfate was used as the carrier surfactant, and Al(OH)3 was found to be preferable to Fe(OH)3 as the adsorbing floe. Optimum pH was 7.5−7.8, at which effluent zinc concentrations below 1 mg/L are easily achieved. The effects of varying the hydraulic loading rate, the surfactant concentration, Al(III) concentration, and ionic strength were studied. Surfactant could be displaced from the sludge in the collapsed foamate by addittion of sodium carbonate.
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McIntyre et al. (1982) studied this question.
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