Abstract Effect of using ozone before elemental chlorine free (ECF) bleaching of oxygen delignified wheat straw pulp produced following soda-anthraquinone pulping on bleaching effluent and pulp properties was studied. The effluent generated during bleaching of pulp contains high amount of adsorbable organic halogens (AOX), chemical oxygen demand (COD), biochemical oxygen demand (BOD) and highly toxic chlorophenolic compounds. This study is aimed to utilise green chemistry approach during bleaching of one of the abundantly used agro residue wheat straw for improving the quality of bleaching effluent and pulp properties. Introducing ozone stage before ECF bleaching resulted in significant reduction of chloriphenolic compounds like chlorocatechols by 48.9 %, chloroguaiacols by 33.3 %, chlorovanillins by 28.4 % and chlorophenols by 26.7 % in the effluent compared to those of control. Incorporation of ozone before ECF bleaching BOD, COD, AOX and colour were reduced by 40.0 %, 41.1 %, 46.7 % and 57.8 %, respectively, as compared to control. Optical properties like brightness and whiteness of the pulp bleached using ozone were also improved by 2.5 units and 4.0 units, respectively as compared to that with control.

中文翻译：

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纸浆无元素氯漂白中引入臭氧对氯酚类化合物生成的影响

摘要 研究了在无元素氯（ECF）漂白前使用臭氧对苏打-蒽醌制浆后产生的氧脱木素麦草浆进行漂白处理和纸浆性能的影响。纸浆漂白过程中产生的废水含有大量可吸附有机卤素（AOX）、化学需氧量（COD）、生化需氧量（BOD）和剧毒氯酚化合物。本研究旨在利用绿色化学方法对一种大量使用的农残麦秸进行漂白，以提高漂白废水的质量和纸浆特性。在 ECF 漂白之前引入臭氧阶段导致氯酚类化合物（如氯代儿茶酚类）显着减少 48.9%、氯愈创木酚类减少 33.3%、氯香草醛类减少 28.4% 和氯酚类减少 26%。与对照相比，流出物中的含量为 7%。与对照相比，ECF 漂白 BOD、COD、AOX 和颜色之前臭氧的掺入分别减少了 40.0%、41.1%、46.7% 和 57.8%。与对照相比，使用臭氧漂白的纸浆的亮度和白度等光学性能也分别提高了 2.5 个单位和 4.0 个单位。