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. 2020 Oct;27(28):34664-34674.
doi: 10.1007/s11356-019-06079-w. Epub 2019 Aug 10.

Application of progressive freezing on forward osmosis draw solute recovery

Huy Quang Le  1   2 , Thi Xuan Quynh Nguyen  1 , Shiao-Shing Chen  3 , Chinh Cong Duong  1   4 , Thanh Ngoc-Dan Cao  1   5 , Hau-Ming Chang  1 , Saikat Sinha Ray  1 , Nguyen Cong Nguyen  2
Affiliations

Application of progressive freezing on forward osmosis draw solute recovery

Huy Quang Le et al. Environ Sci Pollut Res Int. 2020 Oct.

Abstract

Progressive freezing is a solvent purification technology with low energy requirements and high concentration efficiency. Although these advantages make it a promising technology, the technique has never been explored for draw solution recovery for forward osmosis (FO). Hence, in this study, the progressive freezing process was used to concentrate three common diluted draw solutions: NaCl, MgCl2, and EDTA-2Na with different ice front speeds, stirring rates, and initial draw solution concentrations. Effective partition and intrinsic partition constants were also evaluated. The results reveal that the freezing process can achieve a draw solution recovery rate of 99.73%, 99.06%, and 98.65% with NaCl, MgCl2, and EDTA-2Na, respectively, using an ice front speed of 0.5 cm/h, a stirring rate of 2.62 m/s, and 30% of percentage of ice phase. Higher concentration efficiency for NaCl and MgCl2 was achieved due to the high solubility of NaCl and MgCl2 increased solute diffusion into the liquid phase solutions. The concentration factors for all three draw solutions exceeded 1.9, indicating that the draw solutes could be reused for the FO process. In addition, the two mass transfer coefficients depended on the ice front speed and the stirring rates were also obtained for scaling up the experiment in the future.

Keywords: Draw solution recovery; Forward osmosis; Partition constant; Progressive freeze concentration.

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References

    1. Achilli A, Cath TY, Childress AE (2009a) Power generation with pressure retarded osmosis: an experimental and theoretical investigation. J Membr Sci 343:42–52. https://doi.org/10.1016/j.memsci.2009.07.006 - DOI
    1. Achilli A, Cath TY, Childress AE (2010) Selection of inorganic-based draw solutions for forward osmosis applications. J Membr Sci 364:233–241. https://doi.org/10.1016/j.memsci.2010.08.010 - DOI
    1. Achilli A, Cath TY, Marchand EA, Childress AE (2009b) The forward osmosis membrane bioreactor: a low fouling alternative to MBR processes. Desalination 239:10–21. https://doi.org/10.1016/j.desal.2008.02.022 - DOI
    1. Alnaizy R, Aidan A, Qasim M (2013) Draw solute recovery by metathesis precipitation in forward osmosis desalination. Desalin Water Treat 51:5516–5525. https://doi.org/10.1080/19443994.2013.770238 - DOI
    1. Attia AAA (2010) New proposed system for freeze water desalination using auto reversed R-22 vapor compression heat pump. Desalination 254:179–184. https://doi.org/10.1016/j.desal.2009.11.030 - DOI

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