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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

BAEZA, Carolina et al. DEGRADATION OF EDTA IN A TOTAL CHLORINE FREE CELLULOSE PULP BLEACHING EFFLUENT BY UV/H2O2 TREATMENT. J. Chil. Chem. Soc. [online]. 2007, vol.52, n.1, pp.1069-1072. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072007000100003.

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

Keywords : AOTs; UV/H2O2 treatment; EDTA; effluent treatment; TCF effluent.

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