Resumo

MENDEZ NOVELO, Roger Iván; GARCIA REYES, Refugio Bernardo; CASTILLO BORGES, Elba René  e  SAURI RIANCHO, María Rosa. Treating leachate by Fenton oxidation. Ing. Investig. [online]. 2010, vol.30, n.1, pp.80-85. ISSN 0120-5609.

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 Peninsula´s 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.

Palavras-chave : Fenton; leachate; physicochemical treatment; biodegradability index.

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