Abstract. Olive Mill Wastewater (OMW) is a highly organic load waste produced by the three-phase decanter system used in the processing of olives for oil that has phytotoxic and antibacterial phenolic compounds, which help this waste to resist biological degradation. Foam fractionation has not yet been studied with regard to its potential for treatment of such wastewaters. In the present study, this technique was investigated in a simple model system. The e ects of di erent operational conditions, namely, surfactant concentration, process time, pH, and gas ow rate, were evaluated in this study. Statistical analysis of the fractional factorial design revealed that surfactant concentration, pH, and gas ow rate were the most in uential process parameters. Low surfactant concentration and pH of 3-4 were found to be advantageous in terms of good Chemical Oxygen Demand (COD) removal. More than 80% of COD was removed through a single-stage foam fractionation process. This method has proved to be a feasible technique for the OMW e uent treatment.
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