Investigation of Commercial PTFE Membrane for Desalination of High Salinity Solutions and Wastewater Treatment Using Membrane Distillation
Volume Title: 1
1Department of Chemical Engineering, AmirKabir University of Technology,No. 424, Hafez Ave., Tehran, Iran
2Department of Textile Engineering, AmirKabir University of Technology,No. 424, Hafez Ave., Tehran, Iran
Membrane distillation (MD) is a green emerging technology that can be used for the desalination of high salinity solutions and wastewater treatment. The main reason for the limited commercial implementation of MD is membrane pore wetting, which affects the separation performance negatively. In the case of oily wastewater, the presence of surfactants can reduce the liquid entry pressure (LEP) and consequently increases the probability of pore wetting. Another crucial limitation is the insufficient strength and stability of membranes in long-term operations. These two issues are discussed in the current study. First, the performance of double layer PTFE membrane has been investigated in order to improve the process stability. It was concluded that the heat-press can enhance the flux of double-layer membrane up to 66.43%. Second, the presence of surfactant in the feed solution has also been assessed. The results showed the maximum flux of 57 lit/m2 which could be due to the pore wetting of the membrane in the presence of surfactant.