Abstract
Five novel coagulants, DC-491, Fennofix K97, BWD-01, MD-03 and MD-04 were chosen to treat reactive brilliant red X-3B simulated wastewater by jar tests. The results showed that the decolorization efficiencies were all higher than 75% at initial pH 8.2 and temperature 20 after 20 minutes of reaction. Then, two typical coagulants, BWD-01 and MD-04 which had better performance were chosen to study the effect of dye removal of X-3B at different operating parameters, including coagulant dosage, pH, sedimentaion time and reaction temperature of simulated wastewater. Decolorization efficiency of MD-04 for X-3B solution was higher than 80% in pH range from 3 to 9, while for BWD-01, efficiency increased from 37.3% to 82.3% in this pH range. For both BWD-01 and MD-04, the color removal efficiency increased as the solution temperature increased and the maximum efficiency was over 94% at 40. Small changes in the color removal efficiency were observed after 1 hour sedimentation for both coagulants.
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