Evaluation of Removing Volatile Organic Compounds from Wastewater with Using Dissolved Air Flotation

Volatile organic compounds (VOC) are the main class of air contaminants that have harmful effects on human, plants and animals. So, it is necessary to prevent VOC’s emission to environment. In this study feasibility of dissolved air floatation for removing VOCs (Toluene as a Case) was evaluated. Air stripping method was used. Also, a pilot plant was constructed. For generation of bubble the technique of dissolved air flotation utilized. In addition the effect of saturator pressure, flow rate of imported saturated water, the proportion of wastewater flow rate to the saturated water was studied.Maximum removal of toluene was 52% that was obtained at p=2 bar, saturated flow rate=0.4 lit/min and the proportion of flow rates=2. Binary and ternary interaction of main parameters analyzed with Minitab 14 software which indicated that proportional of flow rates, saturated water flow rate and saturator’s pressure alternatively had the highest impact on elimination. In this study, air stripping was used for removing organic compounds from effluents.