Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 490404
Title Zwitterions as alternative draw solutions in forward osmosis for application in wastewater reclamation
Author(s) Lutchmiah, K.; Lauber, L.; Roest, K. de; Harmsen, D.J.H.; Post, J.W.; Rietveld, L.C.; Lier, J.B. van; Cornelissen, E.R.
Source Journal of Membrane Science 460 (2014). - ISSN 0376-7388 - p. 82 - 90.
Department(s) Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2014
Keyword(s) internal concentration polarization - pressure-retarded osmosis - driven membrane processes - anaerobic-digestion - desalination processes - molecular-dynamics - aqueous-solutions - flux behavior - solutes - energy
Abstract The draw solution is the driving force in forward osmosis (FO) processes. The reverse solute leakage of the draw solution is however a major constraint due to cost and energy requirements when reconcentrating the solutes subsequent to the FO process. Several zwitterions as draw solutions (pi approximate to 24 bar and 7 bar) were systematically investigated to enhance the FO performance and minimise the solute loss. The highly soluble zwitterions: glycine, L-proline and glycine betaine demonstrated comparable water fluxes to NaCl (similar to 5 L/m(2) h), but with significantly lower solute loss (J(s): 2.13 +/- 0.54 g/m(2) h; 1.37 +/- 0.09 g/m(2) h, 0.96 +/- 0.4 g/m(2) h respectively and J(sNaCl): 3.26 +/- 0.53 g/m(2) h), which is advantageous for cost reduction. The physico-chemical properties, charge and size played a dominant role in the flux efficiencies. The J(s)/J(v) ratios decreased with (i) a decrease in hydrophobicity and (ii) an increase in size. The FO mass transfer model verified the experimental investigations of the solute transport through the membrane. (C) 2014 Elsevier B.V. All rights reserved.
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