Resumo

HERRERA, Adriana; VELA, Laura; MORALES, Gustavo  e  CASTRO, Ildefonso. IMPLEMENTATION OF FORWARD OSMOSIS AND MAGNETIC NANOADDITIVES FOR WATER DESALINATION. rev.udcaactual.divulg.cient. [online]. 2016, vol.19, n.1, pp.199-206. ISSN 0123-4226.

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.

Palavras-chave : Magnetite; nanomaterials; cellulose; flux; desalinization.

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