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Aerobic degradation of 2-and 3-fluoroaniline in mixed culture systems and microbial community analysis

文献类型： 外文期刊

作者： Zhao, Zhi-Qing 1 ; Shen, Xiao-Li 1 ; Zheng, Tu-Cai 1 ; Lv, Liang 1 ; Su, Yao 3 ; Ghulam, Abbas 4 ;

作者机构： 1.Quzhou Univ, Coll Chem & Mat Engn, Quzhou 324000, Peoples R China

2.Zhejiang Univ, Coll Environm & Resource Sci, Hangzhou, Zhejiang, Peoples R China

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

4.Univ Gujrat, Dept Chem Engn, Gujrat, Pakistan

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

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING （ 影响因子：2.269； 五年影响因子：2.108 ）

ISSN： 1093-4529

年卷期： 2020 年 55 卷 3 期

页码：

收录情况： SCI

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.

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