Effect of ClO2, O2 and H2O2 bleaching stages on the formation of chlorophenolic compounds in Jute Cady pulp

D. Prakash, S. Kumar, N. Rao
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Abstract

Elemental chlorine and chlorine compounds are commonly used in the developing countries for bleaching of pulp. The study deals with the bleaching of Jute Cady pulp with chlorine, chlorine dioxide, peroxide and O2 treatment and identification of various chlorophenolics compounds. The results show that quantity of the total chlorophenolic compounds formed decreases up to 77% at 100% replacement of chlorine by chlorine dioxide in C stage. A 40% and 79% reduction in COD and color value respectively indicate a significant drop in pollution load. There is a reduction of 52% in total chlorophenolic compound when E stage is changed to Ep. The COD and color values are reduced by 30% and 33% respectively as E stage is changed to Ep stage. Oxygen delignification stage reduced the formation of chlorophenolic compounds by 73%. The effluent COD and the color value is reduced by 45% and 28% respectively during this stage.
ClO2、O2和H2O2漂白阶段对黄麻草浆中氯酚类化合物形成的影响
单质氯和氯化合物在发展中国家常用于纸浆漂白。研究了用氯、二氧化氯、过氧化物和O2处理黄麻纸浆的漂白及各种氯酚类化合物的鉴定。结果表明,在C级二氧化氯替代率为100%时,总氯酚类化合物的生成量减少了77%。COD和色值分别下降40%和79%,表明污染负荷显著下降。当E期变为Ep期时,总氯酚化合物减少52%。E级改为Ep级后,COD和颜色值分别降低30%和33%。氧脱木质素阶段使氯酚类化合物的形成减少了73%。在此阶段,出水COD和色值分别降低45%和28%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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