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C. Kamizawa, H. Ogawa, K. Terashima, and M. Ueda
[Comprehensive Research into Advanced Treatment of Effluents Research Report, 42-1, 1993]
Biological waste water from fermentation, food and pulp mills contains large quantities of BOD as decomposed organic materials from cellulose, lignin, starch, saccharide and others. In this research, we aimed at development of effective treatment system which decomposed these organic materials in waste water to CO_{2} and H_{2}O.
Effect of molecular weight on the electolytic oxidation of lignin and the electolytic oxidation of pulp waste water have been studied.
The oxidation potential of the fractionated lignin was remarkably affected by the pH and molecular weight of lignin, it decreased with increasing pH value and decreasing molecular weight.
The pulp waste water used in electrolytic experiment was diluted to a concentration of about 1.0%. To examine the oxidation ability of electrode, platinum and lead-dioxide plates were used. The decrement of COD were obtained 95% using lead-dioxide electrode and 31% using platinum electrode. From this result, using the lead-dioxide electrode, the electrolysis was made at 300 and 600 mA in the range of 10 to 80°C. The effect of electrolytic oxidation was evaluated by COD and absorbance at 280 nm. The most satisfactory result was obtained decrement of COD 98.8% and absorbance at 280 nm 99.3% at 60°C, 600 mA.