Turbid waste (TW) suspensions were prepared by stirring mixed waste (25 g; recovered from the middle fraction of a floatation separation process) intended as combustible refuse derived fuel in 1 L of 1 mol L -1 KOH at 80 °C for 24 h, followed by coarse filtration through glass wool to remove large particles. EG was added to this TW suspension at a concentration of 25 mg mL -1 .