Many industrial processes produce gaseous contaminants that must be removed, at least partially, before exhausting the fumes in the atmosphere and fulfil the limits set by environmental protection agencies. Rubber vulcanization fumes and wood pyrolysis are typical examples of those processes. In other processes, such as coffee roasting, huge quantities of these contaminants are produced and, not being able to be captured, they are dispersed in the air thus cancelling their commercial value. Current technologies for removing gaseous contaminants require intensive maintenance and/or high operating costs. Thermal oxidation in case of high concentrations of pollutants, activated carbon adsorption with period regeneration and electrostatic precipitation of the condensed particles are among the most common technologies used for this purpose.