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The Effect of Draw Solution Concentration on Forward Osmosis Desalination Performance Using Blended Fertilizer as Draw Solution  

Jeong, Namjo (Jeju Global Research Center, Korea Institute of Energy Research)
Kim, Seung-Geon (Dept. of Chemical and Biological Engineering, Jeju National University)
Kim, Dong Kook (Jeju Global Research Center, Korea Institute of Energy Research)
Lee, Ho-Won (Dept. of Chemical and Biological Engineering, Jeju National University)
Publication Information
Membrane Journal / v.23, no.5, 2013 , pp. 343-351 More about this Journal
Abstract
This study is to investigate the effects of the draw solution concentration on forward osmosis desalination performance using blended fertilizer as draw solution. As the concentration of blended fertilizer solution (draw solution) increased, the water permeate flux increased nearly linearly, but PR (performance ratio) was reduced. Using sea water and deionized water as the feed solution, respectively, at the blended fertilizer solution of 600 g/L $H_2O$, the PR obtained were 5.39 and 6.50, respectively. And as the concentration of blended fertilizer solution increased, the reverse solute flux for nitrogen (N), phosphorus (P), and potassium (K) increased nearly linearly, but specific reverse solute flux for them was reduced. The reverse solute flux and specific reverse solute flux became higher in the order of N > K > P.
Keywords
forward osmosis; blended fertilizer; desalination; water permeate flux; performance ratio; reverse solute flux;
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