Impact of Draw Solution Concentration on Forward Osmosis Process: A Simulation Study
Abstract
In this study, a simulation model was used to evaluate the performance of forward
osmosis process. A solution of low salinity was used as the feed solution in forward
osmosis to dilute saline solution (i.e. draw solution) for further desalination. The paper
evaluated the effect of the draw solution concentration on the recovery rate and energy
consumption in forward osmosis. It was found that increasing the concentration of
draw solution increased the recovery rate. Also, while increasing concentration of draw
solution, energy consumption decreased. The maximum recovery rate of 33% was
achieved using (0.5M NaCl) draw solution and a flow rate of 40000 m3/day. The specific
power consumption was 0.21 kWh/m3.
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