Implementation of forward osmosis and magnetic nanoadditives for water desalination
At a laboratory scale by means of a direct osmosis process the desalination of a synthetic seawater was evaluated. This system employed a commercial osmotic and a synthetic osmotic agent prepared from sugar/anhydrous glucose 50/50%w/w and magnetic nanoparticles modified with carboxymethyl cellulose (MNp-CMC). According to measurements from dynamic light scattering, nanoparticles exhibited a hydrodynamic size of 173±53nm. A desalinated water flux of 1,3LMH was determined by the addition of 112,5mg/mL of MNp-CMC to the synthetic osmotic agent, showing an increase of 9.2% as compared to the one obtained without the use of the nanoadditives. Additionally, the magnetic decantation of the nanoparticles by applying an external electromagnetic field was evaluated. Although a concentration decrease of nanoparticles in the water effluent after eight cycles of magnetic separation was detected; by atomic absorption spectroscopy a concentration of 227mg Fe/L in the desalinized water was identified, which is higher than the maximum iron content allowed in drinking water (0.3mg Fe/L), showing that more work is required in order to improve the process of magnetic separation for the application of magnetic nanoadditives in the desalinization of water by direct osmosis systems.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Universidad de Ciencias Aplicadas y Ambientales U.D.C.A
2016
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| Online Access: | https://revistas.udca.edu.co/index.php/ruadc/article/view/226 |
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