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Treating leachate by Fenton oxidation
Tratamiento de lixiviados por oxidación Fenton
DOI:
https://doi.org/10.15446/ing.investig.v30n1.15212Keywords:
Fenton, leachate, physicochemical treatment, biodegradability index (en)Fenton, lixiviado, tratamiento físico-químico, índice de biodegradabilidad (es)
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Leachates are formed from liquids, mainly rainwater, percolating through solid wastes during stabilisation. Their composition is variable and highly toxic; leachate treatment is therefore a complex task. Leachates represent a high risk to health due to the Yucatan Peninsulas highly permeable soil. The results are presented from applying the Fenton process to treating leachate from the sanitary Merida landfill, Yucatan, Mexico. The Fenton process consists of treating the contaminant load with an H2O2 and FeSO4 combination in acidic conditions. Optimal reaction time, pH value, Fenton reagent dose, post treatment coagulation - flocculation doses and increased biodegradability index were all determined. Optimal oxidation conditions and doses were 20 minute contact time, 4 pH, 600 mg/L H2O2 concentration and 1,000 mg/L Fe2+. Average organic matter removal rate, measured as CODS and TOC, were 78% and 87% respectively. The biodegradability index increased from 0.07 to 0.11 during the Fenton process and up to 0.13 when the Fenton process was followed by coagulation-flocculation.
Los lixiviados son el resultado de la percolación de líquidos a través de los desechos sólidos en proceso de estabilización. La complejidad del tratamiento de los lixiviados se deriva de que su composición es altamente tóxica y variable y debido al suelo altamente permeable de la península de Yucatán, México representan un peligro alto para la salud. Se presentan los resultados de aplicar el proceso Fenton a los lixiviados del relleno sanitario de la ciudad de Mérida. El proceso Fenton consiste en tratar la carga contaminante con una combinación de H2O2 y FeSO4 en condiciones ácidas. Se determinaron el tiempo óptimo de reacción, los valores óptimos de pH y dosis de reactivo Fenton, así como las dosis óptimas para el postratamiento coagulación - floculación. Las condiciones y dosis óptimas del proceso de oxidación fueron: tiempo de contacto de 20 minutos, un valor de pH igual a 4, concentraciones de H2O2 de 600 mg/l y Fe2+ de 1,000 mg/l. Los porcentajes de remoción promedio de materia orgánica, medida como DQOs, fue de 78%, y medida como COT, del 87%.
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Copyright (c) 2010 Roger Iván Méndez Novelo, Refugio Bernardo García Reyes, Elba René Castillo Borges, María Rosa Sauri Riancho
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