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Influence of concentration polarization on flux behavior in forward osmosis during desalination using ammonium bicarbonate.

Chanukya, B. S. and Sanketh, Patil and Rastogi, N. K. (2013) Influence of concentration polarization on flux behavior in forward osmosis during desalination using ammonium bicarbonate. Desalination, 312. pp. 39-44.

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Abstract

Forward osmosis is recognized as one of the promising membrane based desalination process and viable alternative to reverse osmosis as a lower cost and more environmentally friendly desalination technology. The solution of ammonium bicarbonate was used as a draw solution to extract water from a feed containing 0.5 M sodium chloride. The water was transported from feed to draw solution and it can be recovered upon moderate heating of the draw solution, which is decomposed into ammonia and carbon dioxide gases producing pure water. The mechanism of water transport in the case of feed containing pure water or sodium chloride has been elucidated depending upon the orientation of the membrane. The concentrative and dilutive internal concentration polarizations played a major role in a situation when feed was towards support layer and feed was towards active layer, respectively. For the desalination applications, the feed towards support layer was found to be best mode to achieve higher flux. An increase in draw solution concentration from 1.0 to 3.6 M, resulted in an increase in flux values from 0.58 to 1.39×10−6 m3m−2 s−1 at 30 °C. Further, an increase in temperature of the draw solution from 30 to 45 °C resulted in increase in transmembrane flux from 1.39 to 2.11×10−6 m3m−2 s−1 at the highest draw solution concentration. It was concluded that forward osmosis can prove to be a feasible technique for the recovery of water from saline water.

Item Type: Article
Uncontrolled Keywords: Forward/direct osmosis, Membrane, Hydrophilic Osmosis, Desalination
Subjects: 600 Technology > 08 Food technology > 07 Food Engineering
Divisions: Food Engineering
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 11 Feb 2013 06:51
Last Modified: 03 Sep 2018 09:31
URI: http://ir.cftri.com/id/eprint/11117

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