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首页> 外文期刊>Environmental Science & Technology >Formation and Emission of PCDD/Fs in Chinese Non-Wood Pulp and Paper Mills
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Formation and Emission of PCDD/Fs in Chinese Non-Wood Pulp and Paper Mills

机译：中国非木浆造纸厂PCDD / Fs的形成与排放

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摘要

Chlorine bleaching is still practiced by non-wood pulp and paper mills in China, resulting in considerable formation and emission of polychlorinated dibenzo-p-dioxins and poly chlorinated dibenzofurans (PCDD/Fs). We investigate the distribution of PCDD/Fs in different papermaking processes and dioxin emissions at six typical Chinese non-wood pulp and paper mills. Raw materials for papermaking included reed, wheat straw, bamboo, and sugar cane bagasse. The formation and emission of PCDD/Fs varied strikingly according to bleaching processes and raw materials. Elemental chlorine bleaching promoted the formation of tetra- to octa-CDDs and 2,3,7,8-TCDF, while hypochlorite bleaching only gave rise to a significant increase of 2,3,7,8-TCDF. Bleaching with elemental chlorine and hypochlorite increased 2,3,7,8-TCDF 0.9-42.5 and 0.3-4.1 times, respectively. Most of the 2,3,7,8-TCDF formed at hypochlorite bleaching stage was partitioned into the effluent, which indicated that hypochlorite bleaching was also an important emission source of dioxins. The removal of PCDD/Fs occurred visibly during alkaline digestion, alkaline extraction, and hydrogen peroxide bleaching. Furthermore, the annual emission of PCDD/Fs from Chinese non-wood pulp and paper mills was evaluated.
机译：中国的非木材纸浆和造纸厂仍在进行氯漂白，导致大量形成和排放多氯二苯并对二恶英和多氯二苯并呋喃（PCDD / Fs）。我们调查了六家典型的中国非木浆造纸厂在不同造纸过程中PCDD / F的分布和二恶英排放。造纸原料包括芦苇，小麦秸秆，竹子和甘蔗渣。 PCDD / Fs的形成和排放随漂白过程和原料的不同而显着变化。元素氯漂白促进了四CDD至八CDD和2,3,7,8-TCDF的形成，而次氯酸盐漂白仅引起了2,3,7,8-TCDF的显着增加。元素氯和次氯酸盐的漂白分别增加了2,3,7,8-TCDF 0.9-42.5和0.3-4.1倍。次氯酸盐漂白阶段形成的2,3,7,8-TCDF大部分被分配到废水中，这表明次氯酸盐漂白也是二恶英的重要排放源。在碱性消化，碱性萃取和过氧化氢漂白过程中，明显去除了PCDD / Fs。此外，还评估了中国非木材纸浆和造纸厂的PCDD / Fs年排放量。

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  • 来源
    《Environmental Science & Technology》 |2012年第21期|12234-12240|共7页
  • 作者

    Xueli Wang; Yuwen Ni; Haijun Zhang; Xueping Zhang; Jiping Chen;

  • 作者单位

    Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People's Republic of China;

    Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People's Republic of China;

    Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People's Republic of China;

    Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People's Republic of China;

    Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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