Abstract
This study aimed to remove AOX (adsorbable organic halogens) with Fenton oxidation from activated sludge in a chemical pharmaceutical industry. The influences of H2O2 dosage, Fe2+ dosage and reaction time were investigated, based on which the reaction conditions for AOX removal were optimized, and the reaction mechanism was discussed. The optimized reaction conditions were as follows:0.90 mol·L-1 of H2O2, 0.045 mol·L-1 of Fe2+[n (Fe2+):n (H2O2) of 1:20] and reaction time of 2 h. Under the optimized conditions, 70.7% of AOX in the sludge and 78.5% of AOX in the supernatant were removed. GC-MS analysis revealed that eleven organic halides were detectable in the original sludge. After Fenton reaction, only three organic halides were detectable, and their peak areas were reduced by 40%-50%. Toxic and hazardous non-AOX organic matters such as xylene, diisobutyl phthalate were also effectively removed.
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