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首页> 外文期刊>Environmental Science & Technology >Biological Dechlorination of Model Organochlorine Compounds in Bleached Kraft Mill Effluents
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Biological Dechlorination of Model Organochlorine Compounds in Bleached Kraft Mill Effluents

机译：漂白牛皮纸制浆废水中模型有机氯化合物的生物脱氯

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摘要

Models of organochlorine compounds present in bleached kraft pulp mill effluent, with well-defined structure, can be used to provide information on the relationship between their chemical structure and their behavior toward biological dechlorination. The biological dechlorination of three monomeric model compounds, 4-methyl-5-chloromuconolactone mono-methyl ester (MCME), 2-chloro-3-methylmuconolac-tone (CMML), and 3-chloro-4-methylcatechol (CMCA), and a dimeric model, 2-(4′-methyl-2′-muconylmethyl)-3-chloro-4-methylmuconic acid dilac-tone (CMDL), were studied. The first two monomers are products of simulated bleaching reactions (sequentially with ClO_2 and NaOH) using a monomeric model compound of residual lignin, 4-methylguaiacol (MG), and are considered to be monomeric models of organochlorines in the ClO_2 bleachery effluents. Similarly, the dimer model is a product of a dimeric lignin model reacting with ClO_2 and NaOH and is considered to be a model of organochlorines of higher molecular weight. CMCA was chosen as a model compound for the phenolic portion in the effluent. It was found that MCME and CMDL do not undergo biological dechlorination. CMML did not dechlorinate in the absence of biomass for over 35 days, but it was dechlorinated by biomass from a pulp mill activated sludge system within 8 days. CMCA was found to be chemically unstable and rapidly dechlorinates when dissolved in water. The recalcitrance of MCME and CMDL to biological dechlorination is postulated to result from the fact that they both possess structural features that represent a dead-end intermediate of the ortho-cleavage pathway that is common to many aerobic bacteria.
机译：漂白牛皮纸制浆厂废水中存在的有机氯化合物模型，具有明确的结构，可用于提供有关其化学结构与生物脱氯行为之间关系的信息。三种单体模型化合物的生物脱氯：4-甲基-5-氯粘康内酯单甲酯（MCME），2-氯-3-甲基粘康乐酮（CMML）和3-氯-4-甲基邻苯二酚（CMCA），以及研究了一种二聚体模型，即2-（4'-甲基-2'-粘康酰基甲基）-3-氯-4-甲基粘康酸丁香酸酯（CMDL）。前两个单体是使用残留木质素的单体模型化合物4-甲基愈创木酚（MG）进行的模拟漂白反应（依次与ClO_2和NaOH结合）的产物，被认为是ClO_2漂白废水中有机氯的单体模型。类似地，二聚体模型是二聚体木质素模型与ClO_2和NaOH反应的产物，被认为是较高分子量的有机氯的模型。选择CMCA作为废水中酚类部分的模型化合物。发现MCME和CMDL没有进行生物脱氯。 CMML在没有生物质的情况下在超过35天的时间内仍未进行脱氯，但在8天之内被制浆厂活性污泥系统中的生物质进行了脱氯。 CMCA被发现化学性质不稳定，溶于水后会迅速脱氯。据推测，MCME和CMDL对生物脱氯的顽固性是由于它们都具有代表许多需氧细菌共有的邻位裂解途径的末端中间体的结构特征。

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  • 来源
    《Environmental Science & Technology》 |1996年第6期|p.1890-1895|共6页
  • 作者

    YING ZHENG; D. GRANT ALLEN;

  • 作者单位

    Department of Chemical Engineering and Applied Chemistry, Pulp & Paper Centre, University of Toronto, 200 College Street, Toronto, Ontario, M5S 3E5 Canada;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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