Both samples showed the same trend: linear and significant increase (p ≤ 0.05) on the percentage of precipitated salt was observed in blank–ethanol mixture (from ca. 30 to ca. 37%) and wastewater–ethanol mixture (from ca. 26 to ca. 33%) by decreasing the temperature from 27 °C to 0 °C (Fig. 3). For each temperature tested, yield of precipitation of sodium chloride was ca. 4% higher in blank– than in wastewater–ethanol mixture; however, the increase in amount of salt precipitated by decreasing temperature from 27 to 0 °C was the same in both samples, ca. 7%