Abstract
The waste water of ozone-bleaching KP (I) was compared with that of C-E-H-D-E-D-bleaching KP (II).
The results obtained are as follows :
(1) The contents of the carbohydrates and weak acids increased with bleaching levels in the waste water of (I). The content of lignin in the waste water of (I) increased in the initiation period and then decreased, which was elucidated by destruction of lignin by ozone.
(2) The gel-filtration chromatogram, IR and NMR spectra showed that the macromolecular lignin were decomposed to low molecular weight organic compounds with no absorption at 280 nm in the reaction of ozone bleaching.
(3) In the comparison of the waste water of (I) with that of (II) at the brightness of 85%, the contents of carbohydrates and TOC components in the former were more than those of the latter, although the lignin content in the former was less than that of the latter. The waste water of (I) contained more amount of organic compounds with low molecular weight than that of (II).
