UTILIZAÇÃO DO BAGAÇO DE LARANJA E DA CINZA DA CASCA DE ARROZ COMO ADSORVENTES DE EFLUENTE TÊXTIL

Abstract

One of the biggest concerns of textile industries is the effluents generated in their production processes, since their residues are bulky, complex and harmful. Currently, there are several methods used for the treatment of textile effluents, and the use of agro-industry waste as natural and biodegradable adsorbents stands out. The aim of the study was to analyze and compare the use of CCA (rice husk ash) and BL (orange bagasse) as replacements for conventional adsorbents, where the surface area was analyzed by the BET process, the pH of the point of zero charge of the two adsorbents (pHpcz) and the adsorption kinetics. For this work, the BL used was dried in the sun for 48 hours and then crushed and the CCA in natura. It was found that the pH_PCZ for CCA was 9.04 and for BL it was 2.60. Therefore, the batch adsorption process was simulated using orange bagasse and rice husk ash in a thermostatic bath, where it was proved that the pseudo-second order model was the best suited for CCA. The adsorption equilibrium time of CCA was 350 minutes and was not found for BL, due to interactions of substances contained in the orange pomace with the dye.