2012/9/19 · Direct contact membrane distillation (DCMD) process was applied for olive mill wastewater (OMW) treatment. Three commercial polytetrafluoroethylene (PTFE) membranes with different pore sizes (TF200 of 0.2 μm, TF450 of 0.45 μm and TF1000 of 1 μm) were tested under different temperatures, namely, temperature difference and mean temperature.