Abstract
The final results in all test were as follow; It has been found that intensity of color of the kraft pulp waste changes only with the variation of pH, and increases in alkali side but dicreases in acid side.As the method of decolor treatment for kraft pulp waste, added coagulation reagent MIC (Al2 (SO4) 3 E18H2O+FeSO4.7H2O) 400 ppm to the waste, color 1, 200B B, and its floatation supernatant after coagulation reaction became color 95BB (92% removal), and COD removal of kraft pulp waste was 20-40 %. Running cost of this method was 2.22¢/waste·m3 (8 yen/waste·m3).
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