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首页> 外文期刊>Environmental Science & Technology >Batch Test for Assessing the Mineralization of ~(14)C-Radiolabeled Compounds under Realistic Anaerobic Conditions
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Batch Test for Assessing the Mineralization of ~(14)C-Radiolabeled Compounds under Realistic Anaerobic Conditions

机译：在实际厌氧条件下评估〜（14）C-放射性标记化合物矿化的批次测试

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摘要

A test system is described for assessing the mineralization of ~(14)C-radiolabeled compounds to carbon dioxide (CO_2) and methane (CH_4) under anaerobic conditions. Environmentally realistic concentrations of test chemicals were incubated with anaerobic digester sludge in sealed vessels at 35℃. The head-space of these vessels was continuously purged with nitrogen, which was passed through a series of potassium hydroxide (KOH) scrubbers to trap ~(14)CO_2. This effluent gas was mixed with oxygen and passed through a combustion tube containing cupric oxide at 800℃ to convert ~(14)CH_4 to ~(14)CO_2, which was subsequently trapped in a second series of KOH traps. Trapping efficiency was 97.1 ± 5% for ~(14)CO_2 and 108 ± 13% for ~(14)CH_4. The system was used to evaluate the mineralization of several organic chemicals including glucose, palmitic acid, hexadecanol, and two surfactants, alkyl ethoxylate sulfate (AES) and alkyl sulfate (AS), in anaerobic digester sludge. Total yields of ~(14)CH_4 and ~(14)CO_2 from these compounds exceeded 80%, and the total mass balances generally exceeded 95%. Mineralization of hexadecanol was described by a simple first-order production equation, while that of the other compounds was best described by a three-half-order model. This system provided excellent recovery of radioactive gases and consequently excellent mass balances. Given the reproduction of in situ condition and the realistic ratio of test material to biomass, the test system also generated relevant kinetic data. It, therefore, has application for demonstrating the significance of biodegradation as a removal mechanism during anaerobic digestion as well as determining the completeness of anaerobic biodegradation.
机译：描述了一种测试系统，用于评估厌氧条件下〜（14）C-放射性标记的化合物矿化成二氧化碳（CO_2）和甲烷（CH_4）的程度。在35℃的密封容器中，将符合实际环境浓度的测试化学品与厌氧消化池污泥一起孵育。这些容器的顶部空间连续用氮气吹扫，然后通过一系列的氢氧化钾（KOH）洗涤器捕集〜（14）CO_2。将该废气与氧气混合，并在800℃下通过装有氧化铜的燃烧管，将〜（14）CH_4转化为〜（14）CO_2，随后将其捕集到第二组KOH捕集阱中。 〜（14）CO_2的捕集效率为97.1±5％，〜（14）CH_4的捕集效率为108±13％。该系统用于评估厌氧消化池污泥中包括葡萄糖，棕榈酸，十六烷醇和两种表面活性剂烷基乙氧基硫酸盐（AES）和烷基硫酸盐（AS）在内的几种有机化学物质的矿化作用。这些化合物的〜（14）CH_4和〜（14）CO_2的总收率超过80％，总质量平衡通常超过95％。十六烷醇的矿化作用通过一个简单的一级生产方程式描述，而其他化合物的矿化作用则可以通过一个三分半的模型来描述。该系统提供了出色的放射性气体回收率，因此具有出色的质量平衡。考虑到原位条件的再现以及测试材料与生物质的实际比率，测试系统还生成了相关的动力学数据。因此，它可用于证明生物降解作为厌氧消化过程中的去除机理的重要性，以及确定厌氧生物降解的完整性。

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  • 来源
    《Environmental Science & Technology》 |1996年第12期|p.3597-3603|共7页
  • 作者

    BARBARA A. NUCK; THOMAS W. FEDERLE;

  • 作者单位

    Environmental Science Department, The Procter and Gamble Company, Ivorydale Technical Center, 5299 Spring Grove Avenue, Cincinnati, Ohio 45217;

  • 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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