Electrocoagulation is usually applied to remove pollutants from the liquid phase, but in this work it is investigated to concentrate pollutants, with the final aim to get a later much more efficient treatment by electrolysis. Results obtained during the treatment of wastes polluted with commercial oxyfluorfen (Fluoxil®) show that electrocoagulation exhibits a good efficiency in removing this model non-ionic halogenated pesticide. It was observed that the chemicals contained in Fluoxil® with higher solubility than oxyfluorfen are less efficiently removed, explaining the lower removal of TOC as compared to that of oxyfluorfen. An improvement in the design of the electrocoagulation was faced by increasing the amount of particles in the reactor, allowing to deplete the pesticide concentration down to levels 2-log below the inlet concentration. The herbicide is concentrated in a solid phase, from where it can be released to a concentrated waste just by changing the pH.
RESUMEN -Se evaluó el desempeño de plásticos reciclables como PolietilenoTereftalato PET y Polipropileno PP como medios de soporte para el crecimiento de biopelícula en reactores aerobios de 2.8 L de lecho fijo para el tratamiento de agua residual doméstica. Estos materiales fueron evaluados durante 300 días. Los reactores con PET contenían pedazos de 5cm x 1cm, mientras que los PP con tiras de 80cm x 5cm. Como sustrato se utilizó agua residual del río Machángara (Quito-Ecuador), cuyo DQOs fué de 200 mg/L, a la que se fortificó con melaza entre 795 a 1420 mg/L. El área específica para los materiales PET y PP fue de 654,62 m2/m3 y 882,5 m2/m3 respectivamente. Durante este tiempo la carga orgánica expresada en gramos de DQOs fue para los reactores con material PET de 16,82 g y 17,95 g DQOs para aquellos con PP. Se logró eficiencias máximas de remoción de DQOs del 95% y 96% para PET y PP respectivamente, siendo este último el mejor dado su mayor porcentaje de remoción alcanzado en menor tiempo.
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