Resumo

CUCHIMAQUE LUGO, Carolina; VARGAS FIALLO, Luz Yolanda  e  RIOS REYES, Carlos Alberto. Fe and Mn retention in natural water by adsorption-oxidation on clinoptilolite. Rev.fac.ing.univ. Antioquia [online]. 2013, n.66, pp.24-44. ISSN 0120-6230.

In the present work of investigation the efficiency in the Fe and Mn removal of the natural water is verified by the use of adsorbent means that consist of natural zeolite (clinoptilolite), recovered with Fe₂O3 and MnO₂ starting from FeCl₃ and MnSO₄, respectively. The zeolite by its great capacity of cation interchange is an excellent support of these oxides. The mechanism of the removal is by adsorption-oxidation of these metals on the surface of the oxide layer that covers the grain with zeolite. In the removal tests by means of a filtration system the variable pH were studied, as well as the Fe and Mn concentrations, flow in the affluent and height of the layer of the zeolite, being the last two being those of more relevance in the removal. Concentrations of 1.0-7.0 mg/L for Fe and 0.5-3.0 mg/L for Mn were used, in a rank of pH of 6.0-8.0. The efficiency of the removal diminishes with the increase in the Fe concentration, especially to high values of pH (> 7.5), by the formation of precipitated of Fe₂O₃ causing acceleration in the saturation of mean. A significant difference was not obtained both on the removal with the use of types of covering, although to high concentrations of these metals, with the Fe₂O₃ layer a little greater percentage of removal were obtained, but the disadvantage is that with this oxide type smaller race of the filters was obtained by the saturation of the means.

Palavras-chave : Clinoptilolite; Fe₂O₃ and MnO₂; experimental; sodium hipochloride; removal.

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