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一株金黄杆菌对2-吡啶甲酸的好氧生物降解
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中国博士后科学基金面上项目(2016M602830)


Aerobic biodegradation of 2-picolinic acid by a Chryseobacterium sp.
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    摘要:

    【背景】2-吡啶甲酸具有高毒性、致癌性,能长期稳定存在于水体中,从而对环境造成危害。【目的】开发一种能够高效经济处理含2-吡啶甲酸废水的技术。【方法】筛选一株在好氧条件下以2-吡啶甲酸为唯一碳、氮、能源的菌株,考察该菌株的降解性能,建立降解动力学模型。【结果】经过16S rRNA基因序列分析,该菌株被鉴定为金黄杆菌(Chryseobacterium sp.),命名为ZD2。当2-吡啶甲酸初始浓度为100、200、400、600和800 mg/L时,ZD2完全降解2-吡啶甲酸的时间分别为10、18、22、78和114 h。零级动力学模型较好地描述了2-吡啶甲酸的降解行为,当初始浓度为100?400 mg/L时,降解速率常数随着浓度的增加而增加,并于400 mg/L时达到最大;600?800 mg/L时,降解速率常数开始下降,呈现抑制作用。【结论】菌株ZD2对2-吡啶甲酸的降解效果较好,能够为处理实际的2-吡啶甲酸工业废水提供理论依据。

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    [Background] 2-Picolinic acid is highly toxic, carcinogenic, and long-term persisted in water bodies, thereby further endangers the environment. [Objective] to develop a technique that can efficiently and economically treat 2-picolinic acid-loaded wastewater. [Methods] We isolated a strain that could use 2-picolinic acid as the sole source of carbon, nitrogen and energy under aerobic conditions, and characterized its degradation. [Results] Based on the 16S rRNA gene sequence analysis, this strain was identified as a Chryseobacterium sp. and named as ZD2. When the initial concentration of 2-picolinic acid was 100, 200, 400, 600 and 800 mg/L, ZD2 completely degraded 2-picolinic acid within 10, 18, 22, 78 and 114 h, respectively. Zero-order kinetic model expressed the degradation behavior of 2-picolinic acid by ZD2 well. Between the concentration of 100 and 400 mg/L, the degradation rate constant increased with the increase in concentration and reached the maximum at 400 mg/L. Between the concentration of 600 and 800 mg/L, the degradation rate constant began to decrease, indicating an inhibitory effect. [Conclusion] The degradation efficiency of 2-picolinic acid by ZD2 demonstrates its potential in decontaminating wastewater containing 2-picolinic acid.

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王巧蕊,范宇睿,郑春莉,沈振兴,杜苗苗. 一株金黄杆菌对2-吡啶甲酸的好氧生物降解[J]. 微生物学通报, 2018, 45(5): 990-995

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  • 在线发布日期: 2018-05-03
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