Abstract

CASTELLAR-ORTEGA, Grey Cecilia et al. ADSORPTION OF DIRECT BLUE 2 DYES OVER A COFFEE GROUNDS IN A FIXED-BED COLUMN AT LABORATORY SCALE. rev.udcaactual.divulg.cient. [online]. 2018, vol.21, n.2, pp.531-541. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v21.n2.2018.971.

Water bodies contaminated with synthetic dyes from industrial activities is a latent problem in our society. Even in low concentration it influences drastically in photosynthesis process because it blocks sun rays affecting both life in water and human health as well. Adsorption with activated carbon is one of the most used techniques to remove dyes from effluents, but high costs have lead researchers to examine adsorbents materials coming from agroindustry. This article introduces a research about direct blue 2 removal in water solution over coffee grounds untreated and modified at 30±1°C in a packed column. A physicochemical characterization was carried out in adsorbents that involves the test of texture properties using isotherms of adsorption with N2 at 77K, the identification and quantification of organic functional groups with FTIR and the Boemh method. The study in column, tested the effect of the height of the bed of the adsorbent (Z = 3 y 6cm), the volumetric flow (Qv = 2 y 4cm3min-1) and the initial concentration (Co = 8 y 14mgdm-3) at the breakthrough time and the capacity of adsorption. The experimental data of breakthrough curves were fitted to BDST (Bed Depth Service Time) models. The results show that performance in the column improves as Z increases and Qv y Co decreases, being the initial concentration the factor with main significance.

Keywords : removal; pollutants; wastewater treatment; adsorption.

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