METHOD FOR TREATING WASTE WATER FROM ELEMENTAL CHLORINE FREE BLEACHING PROCESS

摘要

PROBLEM TO BE SOLVED: To provide a method for treating waste water from an elemental chlorine free ECF bleaching process of a paper pulp production process for simply and effectively removing an organic component and a coloring component at a low cost by a combined use of an activated sludge treatment and an adsorption treatment using incineration ash.

SOLUTION: This method is for treating the waste water from the ECF bleaching process for effectively removing the organic component and the coloring component in the waste water by mixing the waste water with ash discharged from a boiler or an incinerator, and thereafter by treating the waste water via the activated sludge treatment. The specific surface of the ash is preferably 2,000 cm2/g or more. The pH of the ECF bleaching waste water during the treatment is preferably not less than 8. The used ash can be reused after incinerating at 800°C or higher.

COPYRIGHT: (C)2006,JPO&NCIPI