ECF漂白过程中AOX减量技术研究进展

摘要

This paper discussed the research background and status of absorbable organic halogens (AOX) reduction technology at home and abroad.Meanwhile,the following AOX reduction technologies were summarized.Firstly,the amount of chlorine bleaching agent could be reduced by adjusting bleaching process,in order to reduce the AOX formation.Secondly,adding chemical additives such as H2O2 or sulfurbased,nitrogen-based,etc.additives to inhibit the AOX formation.Thirdly,pretreatment before bleaching including using hot water preextraction,acid or alkali pretreatment and biological enzyme pretreatment to reduce the content of lignin and hemicellulose in pulp,so as to reduce the AOX formation.%对纸浆漂白过程中可吸附有机卤素(AOX)减量技术的研究背景与国内外研究现状进行了论述;并通过调查ECF漂白过程中AOX减量技术的研究进展,对AOX相关减量技术做出如下概括:①优化工艺;通过调整漂白工序减少含氯漂剂的用量,从而减少AOX的生成量.②添加化学助剂;通过添加H2O2或添加含硫基、氮基等助剂抑制AOX产生.③漂前预处理;纸浆漂白之前采用热水预抽提、酸碱预处理以及生物酶预处理等方法处理纸浆,减少纸浆中的木素和半纤维素含量,从而降低AOX生成量.