Publicación: DEGRADATION OF EDTA IN A TOTAL CHLORINE FREE CELLULOSE PULP BLEACHING EFFLUENT BY UV/H2O2 TREATMENT.
Fecha
2007
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JOURNAL OF THE CHILEAN CHEMICAL SOCIETY
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.
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UV/H2O2 treatment, TCF effluent., effluent treatment, EDTA, AOTs
