Abstract

MILLAN, Fernando; PRATO, José G; MONTILLA, Tábatha  and  TNSELIA, Claudiu. Using of variable charge adsorption beds for filtration of residual waters. Rev. Téc. Ing. Univ. Zulia [online]. 2018, vol.41, n.1, pp.2-14. ISSN 0254-0770.

Present work show results from the experimental filtration process of a residual water trough different adsorbent beds made with three lithological refractory materials of variable charge. Four types of substrates were prepared: calcined without activation, calcined activated with HCl 0.1N (positive charges activated), calcined activated with NaOH 0.1N (negative charges activated) and a mixed at 50 %. Substrates washing with bidistilated water in a column experiment show increments in solution conductivities, this ionic charge is produced by the dissolution of metals however, their concentration is at trace level. Alkaline and alkaline earth get to denary of ppm but these cations are common in natural waters. Filtration processes of a residual water sample produce a 50 % reduction of turbidity after first 200 ml of percolation and under 2 NTU after 600 ml percolation. Filtrated solutions conductivity initially increase because of ionic contribution of calcined substrate, but it is reduced to more than 50 % after 600 ml of filtration. pH values keeps constant between 6 and 8 during the percolation of 1200 ml of liquid. Results show that this kind of filtrating beds can be used in reducing residual water turbidity and conductivity or any other similar residual water or interventioned natural waters.

Keywords : residual water; filtration; variable charge substrate.

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