Performance of Manipulated Direct Osmosis in Water Desalination Process

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Author(s) Majid I. Abdul Wahab | Hussain I. Saleh | Ahmed Faiq Al-Alawy
Pages 458-468
Volume 4
Issue 10
Date October, 2015
Keywords Osmosis; Forward Osmosis; Direct Osmosis; Desalination; Reverse Osmosis; Draw Solution.

The present work aims to study the factors affecting the performance of novel forward (direct) osmosis (FO) desalination process. Forward osmosis module is made from polyamide spiral-wound membrane type TFC – SSRO50G. Sodium sulphate (Na2SO4), magnesium chloride hexahydrate (MgCl2.6H2O), magnesium sulfate hydrate (MgSO4.7H2O), glucose and sucrose were used as draw solutions to extract water from sodium chloride solution across a semi-permeable polymeric membrane.The driving force in the FO process is provided by a difference in osmotic pressures (concentrations) across the membrane between the draw and brine solution sides. Process variables studied were draw solutions concentration (10 – 90 g/l), draw solutions flow rate (2.4 – 8.4 l/hr), and feed temperature of draw solution (18 and 36 oC). It was found that water flux increases with increasing draw solution concentration and feed temperature of draw solution, and decreases with increasing draw solution flow rate. It was found also that the effect of draw solution concentration has the higher effect on the water flux among other variables. Sodium sulphate (Na2SO4) has a high water flux than other materials which studied.

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