1. Department of Chemical Engineering, Instituto Federal Sul-Rio-Grandense (IFSul), Campus Pelotas, 455 Praça 20 de Setembro, Pelotas 96015-360, RS, Brazil
2. Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria–UFSM, 1000 Roraima Avenue, Santa Maria 97105-900, RS, Brazil