Comparison of Inorganic Draw Solutes in Forward Osmosis Desalination Process

In this investigation, four draw solutions suitable for forward osmosis (FO) applications including NaCl,MgCl۲, Na۲SO۴ and MgSO۴ were tested at the same osmotic pressure to appraise water flux and reversesalt diffusion through the FO membrane. It was found that the process was less affected by internalconcentration polarization (ICP) when NaCl and MgCl۲ with higher diffusion coefficient were used.Therefore, the higher diffusion coefficient resulted in higher water flux. In contrast, both of them showeda higher reverse salt flux than Na۲SO۴ and MgSO۴ salts which was possibly due to the monovalent Na+and Cl- which could easily diffused through the FO membrane.

کلیدواژه ها:

Desalination ، Forward osmosis ، Internal concentration polarization ، Reverse salt diffusion