Removal of chloride, sulphate, TOC and COD from aqueous solution by vacuum distillation

Abstract

In this study, treatment of strong wastewater that cannot be treated economically with conventional methods was investigated using vacuum distillation method. Low evaporation temperatures (50-60 degrees C) and low vacuum pressures (30, 40, 60 and 70 kPa) were selected as experimental conditions. The evaporation studies were carried out at 60 degrees C in seawater, while the salinity reduction was investigated under a vacuum of 30-70 kPa and a removal rate of up to 90% was achieved. In a study, on chemical industry wastewater, carried out at 60 degrees C temperature and under a vacuum of 50, 60 and 70 kPa experimental conditions was achieved that COD parameter reduced from 18,800 mg/L to 500 mg/L in 180 min. Albeit COD removal was based on the experiments, parameters such as TOC, pH, sulphate and distillate amount were also resolute.