Electrochemical oxidation of landfill leachate in a flow reactor: optimization using response surface methodology
2015
Silveira, Jefferson E. | Zazo, Juan A. | Pliego, Gema | Bidóia, Edério D. | Moraes, Peterson B.
Response surface methodology based on Box-Behnken (BBD) design was successfully applied to the optimization in the operating conditions of the electrochemical oxidation of sanitary landfill leachate aimed for making this method feasible for scale up. Landfill leachate was treated in continuous batch-recirculation system, where a dimensional stable anode (DSA©) coated with Ti/TiO₂and RuO₂film oxide were used. The effects of three variables, current density (milliampere per square centimeter), time of treatment (minutes), and supporting electrolyte dosage (moles per liter) upon the total organic carbon removal were evaluated. Optimized conditions were obtained for the highest desirability at 244.11 mA/cm², 41.78 min, and 0.07 mol/L of NaCl and 242.84 mA/cm², 37.07 min, and 0.07 mol/L of Na₂SO₄. Under the optimal conditions, 54.99 % of chemical oxygen demand (COD) and 71.07 ammonia nitrogen (NH₃-N) removal was achieved with NaCl and 45.50 of COD and 62.13 NH₃-N with Na₂SO₄. A new kinetic model predicted obtained from the relation between BBD and the kinetic model was suggested.
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