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Structure-Reactivity of Naphthenic Acids in the Ozonation Process

机译：臭氧化过程中环烷酸的结构反应性

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摘要

Large volumes of oil sands process-affected water (OSPW) are produced in northern Alberta by the surface mining oil sands industry. Naphthenic acids (NAs) are a complex mixture of persistent organic acids that are believed to contribute to the toxicity of OSPW. In situ microbial biodegradation strategies are slow and not effective at eliminating chronic aquatic toxicity, thus there is a need to examine alternative remediation techniques. NAs with multiple rings and alkyl branching are most recalcitrant to microbial biodegradation, but here we hypothesized that these same structural features may lead to preferential degradation in the ozonation process. Total NA degradation increased with increasing pH for commercial NA solutions, suggesting a hydroxyl radical mechanism and that naturally alkaline OSPW would unlikely require pH adjustment prior to treatment For commercial NAs and OSPW, NAs with more rings and more carbon (and more H atoms) were depleted most rapidly in the process. Relative rate measurements with binary mixtures of model NA compounds not only confirmed this structure reactivity but also indicated that alkyl branching patterns were an additional factor determining NA reactivity. The results demonstrate that ozonation is complementary to microbial biodegradation, and the process remains a promising water reclamation strategy for the oil sands industry.
机译：阿尔伯塔省北部的地表采矿油砂行业生产了大量受工艺影响的油砂水（OSPW）。环烷酸（NAs）是持久性有机酸的复杂混合物，据信会导致OSPW的毒性。原位微生物生物降解策略缓慢且不能有效消除慢性水生毒性，因此有必要研究替代性修复技术。具有多个环和烷基分支的NAs对微生物的生物降解作用最强，但是在这里我们假设这些相同的结构特征可能导致臭氧化过程中的优先降解。对于工业NA溶液，总的NA降解随着pH值的增加而增加，这表明存在羟基自由基机制，并且天然碱性OSPW在处理之前不太可能需要调节pH。在此过程中消耗最快。使用模型NA化合物的二元混合物进行的相对速率测量不仅证实了这种结构的反应性，而且还表明烷基支化模式是决定NA反应性的另一个因素。结果表明，臭氧化是微生物生物降解的补充，并且该过程对于油砂行业仍然是一种有希望的水回收策略。

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  • 来源
    《Environmental Science & Technology》 |2011年第17期|p.7431-7437|共7页
  • 作者

    Leonidas A. Perez-Estrada; Xiumei Han; Przemyslaw Drzewicz; Mohamed Gamal El-Din; Phillip M. Fedorak; Jonathan W. Martin;

  • 作者单位

    Department of Laboratory Medicine and Pathology, Division of Analytical and Environmental Toxicology, University of Alberta,Edmonton, Alberta, Canada;

    Department of Laboratory Medicine and Pathology, Division of Analytical and Environmental Toxicology, University of Alberta,Edmonton, Alberta, Canada;

    Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada;

    Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, Canada;

    Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada;

    Department of Laboratory Medicine and Pathology, Division of Analytical and Environmental Toxicology, University of Alberta,Edmonton, Alberta, 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);
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  • 正文语种 eng
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