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首页> 外文期刊>Journal of Environmental Science and Health >Aerobic degradation of 2- and 3-fluoroaniline in mixed culture systems and microbial community analysis
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Aerobic degradation of 2- and 3-fluoroaniline in mixed culture systems and microbial community analysis

机译：混合培养系统中2-和3-氟苯胺的有氧降解和微生物群落分析

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摘要

Among three monofluoroanilines, 2-fluoroaniline (2-FA) and 3-fluoroaniline (3-FA) exhibit relatively poor biodegradability. This work examined their degradation characteristics in a mixed culture system and also analyzed the microorganism community. After acclimation for 58 d and 43 d, the high removal efficiency of 100% of 2-FA and 95.3% of 3-FA was obtained by adding 25 mg L-1 of 2-FA or 3-FA to the two reactors, respectively. In addition, the high defluorination rates of 2-FA and 3-FA were observed to be 87.0% and 89.3%, respectively. The degradation kinetics showed that the maximum specific degradation rates of 2-FA and 3-FA were (21.23 +/- 0.91) mg FA (g center dot VSS center dot h)(-1), and (11.75 +/- 0.99) mg FA (g center dot VSS center dot h)(-1), respectively. PCR-DGGE analysis revealed that the unique bacteria degrading 2-FA were mainly composed of six genera (Novosphingobium, Bradyrhizobium, Aquaspirillum, Aminobacter, Ochrobactrum, and Labrys), and five genera that degraded 3-FA (Ochrobactrum, Aquaspirillum, Lachnobacterium, Bradyrhizobium, and Variovorax). Analysis of the key catabolic enzyme activities indicated that the simultaneous hydroxylation and dehalogenation were involved in monooxygenase elimination of 2-FA and conversion of 3-FA to 4-fluorocatechol by dioxygenase, indicating that enriched mixed cultures were effective to metabolize 2-FA or 3-FA by unconventional pathways to prevent the accumulation of toxic metabolites.
机译：在三种单氟苯胺中，2-氟苯胺（2-FA）和3-氟苯胺（3-FA）表现出相对较差的生物降解性。这项工作检查了它们在混合培养系统中的降解特性，并分析了微生物群落。适应58 d和43 d后，分别向两个反应器中添加25 mg L-1的2-FA或3-FA，可获得100％的2-FA和95.3％的3-FA的高去除效率。 。另外，观察到2-FA和3-FA的高脱氟率分别为87.0％和89.3％。降解动力学表明2-FA和3-FA的最大比降解率分别为（21.23 +/- 0.91）mg FA（g中心点VSS中心点h）（-1）和（11.75 +/- 0.99） mg FA（g中心点VSS中心点h）（-1）。 PCR-DGGE分析表明，降解2-FA的独特细菌主要由六个属（新孢子虫，缓生根瘤菌，水螺旋藻，氨基杆菌，O菜属和拉伯斯属）和降解3-FA的五个属（act菌属，水螺旋藻，扁毛杆菌，缓生根瘤菌）组成和Variovorax）。对关键分解代谢酶活性的分析表明，同时羟基化和脱卤参与了2-FA的单加氧酶消除和双加氧酶将3-FA转化为4-氟邻苯二酚，表明富集的混合培养物可有效代谢2-FA或3 -FA通过非常规途径防止有毒代谢产物的积累。

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  • 来源
    《Journal of Environmental Science and Health》 |2020年第4期|305-317|共13页
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  • 作者单位

    Quzhou Univ Coll Chem & Mat Engn Quzhou 324000 Peoples R China|Zhejiang Univ Coll Environm & Resource Sci Hangzhou Zhejiang Peoples R China;

    Quzhou Univ Coll Chem & Mat Engn Quzhou 324000 Peoples R China;

    Zhejiang Acad Agr Sci Dept Agroenvironm Engn Environm Resources & Soil Fertilizer Res Inst Hangzhou Zhejiang Peoples R China;

    Univ Gujrat Dept Chem Engn Gujrat Pakistan;

  • 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
  • 关键词

    Fluoroaniline; acclimation mixed culture; biodegradation kinetics; PCR-DGGE; metabolic pathway;

    机译：氟苯胺;适应混合文化;生物降解动力学;PCR-DGGE;代谢途径;

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