Abstract
As an effective treatment of waste liquor from the kraft pulping process, its electrolytic oxidation has been attempted. The waste liquor used in electrolytic experiment was diluted to a concentration of about 1%. The reactivity of lignin in the waste liquor was estimated from the oxidative reaction of the purified thiolignin. To examine the oxidating ability of electrode, platinum, stainless steel and lead-dioxide plates were used as the electrode. The values of COD and absorbances at 280 and 500 nm of the waste liquor after the electrolysis decreased according to the following order of electrodes : lead dioxide stainless steel platinum. From this result, using the lead-dioxide electrode, the controlled-current electrolysis was made at 300 and 600 mA in the range of 10 to 80°C.The effect of electrolytic oxidation on the waste liquor was evaluted by measurements of COD and absorbance of the liquor. The high current density was effective for the treatment of the waste liquor at temperatures above 60°C, whereas the low current density was effective at temperatures below 30°C. The most satisfactory result was obtained at 60°C and 600 mA.
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