Abstract
KMnO4 was selected as oxidizers for the oxidation and degradation of cafeteria wastewater. The treatment effects were evaluated by the changes of COD and BOD5 parameters. Orthogonal experiments were designed to optimize the processing conditions based on the single affected factor. The optimized controlling conditions for KMnO4 treatment process were KMnO4=0.3 mmol/L, pH=2, reaction time=60 minutes respectively. The COD removal ratios using KMnO4, ClO2, Fenton reagent treatment were 26%, 55% and 82% respectively. It showed that of Fenton was highest. But after its oxidation, it created other refractory substance and the produced sludge was also difficult to settle down. When using ClO2, the pH in process is closer to neutral, thus saved large quantity of acid. The treatment using KMnO4 showed there was little refractory precipitation, but its COD removal was too low.
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