Degradation of edta in a total chlorine free cellulose pulp bleaching effluent by uv/h2o2 treatment
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Carolina Baeza [1] ; Claudia Oviedo [2] ; Claudio Zaror [1] ; Jaime Rodríguez [1] ; Juanita Freer [1]
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[1] Universidad de Concepción
Universidad de Concepción
Comuna de Concepción, Chile
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[2] Universidad del Bío-Bío
Universidad del Bío-Bío
Comuna de Concepción, Chile
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- Localización: Journal of the Chilean Chemical Society (Boletín de la Sociedad Chilena de Química), ISSN-e 0717-6309, ISSN 0366-1644, Vol. 52, Nº. 1, 2007, págs. 1069-1072
- Idioma: inglés
- Enlaces
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Resumen
Degradation of EDTA in a Total Chlorine Free (TCF) cellulose pulp bleaching effluent, using UV and UV/H2O2 in presence and absence of iron, was studied. All experiences were conducted in an annular photolytic reactor at pH 9, 20°C, and 0.38 mM (110 mgL-1) EDTA concentration. EDTA degradation followed a first order apparent kinetics, with rate constant in the range of 0.02-0.72 min-1, depending on the initial hydrogen peroxide concentration and iron content. UV treatment without peroxide yielded 100 % degradation of Fe(III)-EDTA in 40 minutes of reaction, but low COD (8 %) and TOC (13 %) removal. Peroxide addition (3.3 mM)increased Fe(III)-EDTA degradation rates by UV treatment, resulting in 100% removal after 20 minutes, and greater COD (28 %) and TOC (36 %) reductions. In absence of iron, peroxide addition was required to obtain EDTA degradationyields above 50% after 1 h treatment. Results presented here show that UV/H2O2 treatment could be suitable as a preliminary stage before a biological treatment
