Nitrate-dependent biodegradation of quinoline, isoquinoline, and 2-methylquinoline by acclimated activated sludge
Nitrate-dependent biodegradation of quinoline, isoquinoline, and 2-methylquinoline by acclimated activated sludge
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驯化活性污泥对喹啉、异喹啉和 2-甲基喹啉的硝酸盐依赖性生物降解
DOI：
10.1016/j.jhazmat.2009.08.061
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发表时间：
2010-01-15
影响因子：
13.6
通讯作者：
Gu, Guowei
中科院分区：
文献类型：
--
作者：
Li, Yongmei;Wang, Lin;Gu, Guowei
研究了驯化活性污泥在硝酸盐还原条件下对喹啉、异喹啉和2-甲基喹啉的厌氧降解。降解过程中喹啉完全转化，最佳COD/NO3-N为7。异喹啉和2-甲基喹啉也完全转化，但硝酸盐消耗较低，最佳COD/NO3-N分别为83~92和21~26。CC-MS分析表明，在降解过程中，喹啉和异喹啉通过羟基化分别转化为2(1H)-喹诺酮和1(2H)-异喹诺酮。当喹啉完全矿化时，只有92%的异喹啉被矿化，1(2H)-异喹啉酮残留在流出液中。2-甲基喹啉通过加氢转化为1，2，3，4-四氢-2-甲基喹啉，进一步的降解导致杂环断裂，留下4-乙基苯胺。两种代谢物都留在了出水中，导致2-甲基喹啉的矿化度较低(58%)。这是首次观察到2-甲基喹啉在反硝化条件下可降解，并鉴定了其代谢物。(C)2009爱思唯尔B.V.保留所有权利。
The anaerobic degradation of quinoline, isoquinoline and 2-methylquinoline was investigated under nitrate-reducing conditions with acclimated activated sludge. Quinoline was completely transformed during degradation with an optimum COD/NO3-N ratio of 7. Isoquinoline and 2-methylquinoline were also completely transformed; however, nitrate consumption was much lower with the optimum COD/NO3-N ratios being in the ranges of 83-92 and 21-26, respectively. CC-MS analyses showed that during degradation, quinoline and isoquinoline were transformed by hydroxylation into 2(1H)-quinolinone and 1(2H)-isoquinolinone, respectively. While quinoline was completely mineralized, only 92% of isoquinoline was mineralized, and 1(2H)-isoquinolinone remained in the effluent. 2-Methylquinoline was transformed by hydrogenation to 1,2,3,4-tetrahydro-2-methyl-quinoline, and further degradation resulted in cleavage of the heterocyclic ring leaving 4-ethyl-benzenamine. Both the metabolites remained in the effluent, resulting in the low mineralization of 2-methylquinoline (58%). This is the first time that 2-methylquinoline is observed degradable under denitrifying conditions, and its metabolites are identified. (C) 2009 Elsevier B.V. All rights reserved.