Abstract
The waste liquor from the first cooking stage of reed three-stage counter-current batch cooking with ethanol-water process was decolorized by preliming, sulfitation and activated carbon absorption combination method. The preliming temperature, calcium superphosphate dosage, pH Value, Na2SO3dosage in preliming and sulfitation, column height and velocity in activated carbon absorption have effect on decolorization. The results indicated that the 50 mL un decolorized waste liquor have the best decolorizing effect when the preliming temperature was 80°C, calcium superphosphate dosage was 1 g, pH value was 7, Na2SO3dosage was 0.04 mol, column height was 12 cm and velocity was 2mL/min, the decolorized rate of waste liquor could be up to 98.1%.
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