Análise da adsorção do Íon Ni (II) utilizando como adsorventes lodos de rab e uasb em reatores verticais de coluna.

Abstract

World demand for industrial pollutants has become a major problem. In this sense the adsorption of metals using organic solid waste, has stood out for being a rich material polyatomic substances, and present high power as adsorbent metal column. In order to mitigate the consequences of this contamination, the application methods of removing these contaminants are efficient and low cost is desirable. Thus, the main objective of this work is to set up and monitor two vertical reactors columns containing types of adsorbents, obtained sewage sludge anaerobic reactor batch (RAB) and the anaerobic reactor upflow (UASB) and investigate the ion adsorption capacity of Ni (II) the two adsorbers and determine the kinetic parameters and the isothermal models that best represent the adsorption process. Accordingly, the reactors were monitored for 100 days, charged with 100 g of adsorbent, and fed to the metal solution (NiCl2.6H2O). To perform this work, the formation of chemical compounds on the surface of the adsorbent during the adsorption process was verified by performing kinetic curves by pseudo models first order and pseudo second order and the isotherms of equilibrium Langmuir and Freundlich, respectively . Through the obtained results it can be concluded that the ion Ni (II) gave a removal of 97,22 % for sludge in UASB pH 6,04 while for the RAB sludge removal was 76,90 % at pH 6,33. The adsorption capacity of the ion Ni (II) for the sludge of the adsorbent was 1,70 UASB Ni.g-1.mg and sludge adsorbent RAB 1,35 mg Ni.g-1. The concentration of metal removed from the UASB reactor was 48,61 mg L-1 and the RAB Slurry 38,45 mg L-1. The kinetic model that set the values was the pseudo second order for the UASB sludge with about 0,9869 correlation factor (R2). For Langmuir isotherm and Freundlich results showed satisfactory for the UASB sludge.