对典型的蔗渣浆无元素氯( ECF) 短序漂白流程 D₀ EpD、OpDEp 及 OpD 进行了对比，探讨了二氧化氯脱木素( D₀ ) 与过氧化氢强化氧脱木素( Op) 的脱木素效率差异及对后续漂白的影响，并分析了漂白过程中可吸附有机卤化物( AOX) 的产生量和各漂白流程的直接化学品成本．结果表明: D₀ 段脱木素选择性好，ClO₂ 用量为 0．8% 时脱木素率即达40%以上，且用量越高脱木素作用越强; Op 段在脱出纸浆中残余木素的同时能大幅提升纸浆白度，纸浆白度明显高于 D₀ 浆; 相同后续漂白化学品用量下，OpDEp 漂后浆白度高于 D₀ EpD 漂后浆白度， 且比 OpD 漂后浆白度约高 12 个百分点; 相同纸浆白度下，OpDEp漂白过程中产生的可吸附有机卤化物总量约为 D₀ EpD 的50%， 其直接化学品成本比后者低约 40. 00 元/t，具有更好的环境、经济效益．

In this paper,first,three typical element chlorine- free (ECF) short- sequence bleaching processes,namely D₀ EpD,OpDEp and OpD,were comparatively investigated.Then,the difference in delignification rate be-tween the chlorine dioxide delignification (D₀ ) and the peroxide- reinforced oxygen delignification (Op) was re-vealed,and the effect of pre- delignification on the subsequent bleaching was analyzed.Finally,the AOX (Absor-bable Organic Halides) emission and the direct chemical cost during the bleaching were discussed.The results in-dicate that (1) D₀ possesses high delignification selectivity; for instance,the delignification rate reaches 40% at aClO₂ dosage of only 0.8% and continuously increases with ClO₂ dosage; (2) Op can not only delignify the residuallignin in pulp but also remarkably improve the pulp brightness to a value much higher than that of D₀ pulp; (3)OpDEp bleaching is more effective than D₀ EpD bleaching at the same chemical dosage in the subsequent bleachingbecause it may result in higher pulp brightness; (4) the final brightness of OpDEp bleached pulp is about 12 per-centage points higher than that of OpD bleached pulp; and (5) at the same pulp brightness,the AOX emitted du-ring the OpDEp bleaching is only about half of that emitted during the D₀ EpD bleaching,and the direct chemicalcost of OpDEp bleached pulp is 40. 00 Yuan/t lower than that of D₀ EpD bleached pulp,which means that OpDEpbleaching is of higher environmental and economic benefits.