OBTENÇÃO DE PIGMENTOS INORGÂNICOS A PARTIR DA ESCUMA GERADA EM UM REATOR DE TRATAMENTO DE EFLUENTES DOMÉSTICOS

Abstract

Due of search for lower cost inorganic pigments, aiming enable their application in large scale, the utilization of residues containing elements of interest in synthesis was viewed as an interesting alternative. Thus, the main aim of this research was find an application for scum generated from reactor of anaerobic treatment of domestic effluents, since this residue has no application until now. Therefore, ashes of scum generated from anaerobic treatment of domestic effluents were submitted to acid and thermal treatments, aiming pigments with more intense color. All the samples obtained are composed by Al2O3, Fe2O3 e Ca9Al(PO4)7. The samples treated thermally to 950 and 1000 °C presented excellent results for enamel ceramic pieces, for coloration of polymethylmethacrylate (PMMA) and as pigment for water-based paints. The samples obtained to 1100 °C and the synthetic samples presented good results for enamel ceramic pieces, but not for PMMA and paint, in this case milling is necessary. The residue of acid treatment is rich in Si and Ca, therefore, this sample presents potential to future researches.