Polishing of painting process effluents through adsorption with biochar from winemaking residues
Artículo de revista
Springer Science + Business Media
Environmental Science and Pollution Research
A real industrial efuent from the pre-treatment and painting processes was polished through adsorption using alternative biochar derived from grape pomace wastes. The biochar was produced in a pilot-scale plant from composted grape pomace. Biochar showed an equilibrium between acidic and basic groups on the surface. The presence of irregular cavities in the structure and mesopores was confrmed by analyzing N2 physisorption and SEM. Concerning the efuent, Ni and Zn were the main problematic elements. The adsorption isotherms and kinetics of Ni and Zn from the efuent using the biochar could be represented by the Henry, pseudo-frst-order, and pseudo-second-order models, respectively. Adsorption equilibrium was reached within 60 min for Ni and Zn present in the real efuent. Besides, the adsorption process was endothermic, favorable, and spontaneous. These results demonstrate that Zn and Ni metals were successfully removed from the industrial efuent, presenting fnal concentration values within the limit of legislation for efuent disposal in agricultural soil.
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