Polishing of painting process effluents through adsorption with biochar from winemaking residues

Abstract

A real industrial effluent 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 confirmed by analyzing N 2 physisorption and SEM. Concerning the effluent, Ni and Zn were the main problematic elements. The adsorption isotherms and kinetics of Ni and Zn from the effluent using the biochar could be represented by the Henry, pseudo-first-order, and pseudo-second-order models, respectively. Adsorption equilibrium was reached within 60 min for Ni and Zn present in the real effluent. Besides, the adsorption process was endothermic, favorable, and spontaneous. These results demonstrate that Zn and Ni metals were successfully removed from the industrial effluent, presenting final concentration values within the limit of legislation for effluent disposal in agricultural soil.

O Impacto Da Sacarose Na Nutrição Humana E Análise De Açúcar Em Alimentos

“…Vários compostos podem ser utilizados para a remoção de poluentes por adsorção, como zeólitas, alumina, quitosana, carvão ativado entre outros (Krstic et al, 2018;Ríos et al, 2008;Gupta et al, 2011;Sessarego et al, 2019;Bernard et al, 2013;Cai et al, 2018). No entanto, compostos residuais de baixo custo como bioadsorventes têm sido avaliados na remoção de metais de efluentes industriais, apresentando bom desempenho (Keshvardoostchokami et al, 2017;Carvalho et al, 2022). Dada a eficiência e considerando o baixo custo dos adsorventes preparados em condições brandas a partir de resíduos da agricultura, este projeto propõe avaliar a eficiência do método de adsorção utilizando a semente de mamão como bioadsorvente no tratamento de efluentes.…”