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首页> 外文期刊>Journal of the air & waste management association >Shift of microbial diversity and function in high-efficiency performance biotrickling filter for gaseous xylene treatment
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Shift of microbial diversity and function in high-efficiency performance biotrickling filter for gaseous xylene treatment

机译：用于气态二甲苯处理的高效生物滴滤池中微生物多样性的转移和功能

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摘要

Xylene is the main component of many volatile industrial pollution sources, and the use of biotechnology to remove volatile organic compounds (VOCs) has become a growing trend. In this study, a biotrickling filter for gaseous xylene treatment was developed using activated sludge as raw material to study the biodegradation process of xylene. Reaction conditions were optimized, and long-term operation was performed. The optimal pH was 7.0, gas-liquid ratio was 15:1 (v/v), and temperature was 25 degrees C. High-throughput sequencing technique was carried out to analyze microbial communities in the top, middle, and bottom layers of the reactor. Characteristics of microbial diversity were elucidated, and microbial functions were predicted. The result showed that the removal efficiency (RE) was stable at 86%-91%, the maximum elimination capacity (EC) was 303.61 g center dot m(-3)center dot hr(-1), residence time was 33.75 sec, and the initial inlet xylene concentration was 3000 mg center dot m(-3), which was the highest known degradation concentration reported. Kinetic analysis of the xylene degradation indicated that it was a very high-efficiency-activity bioprocess. The r(max) was 1059.8 g center dot m(-3)center dot hr(-1), and K-s value was 4.78 g center dot m(-3) in stationary phase. In addition, microbial community structures in the bottom and top layers were significantly different: Pseudomonas was the dominant genus in the bottom layer, whereas Sphingobium was dominant in the top layer. The results showed that intermediate metabolites of xylene could affect the distribution of community structure. Pseudomonas sp. can adapt to high concentration xylene-contaminated environments. Implications: We combined domesticated active sludge and reinforced microbial agent on biotrickling filter. This system performed continuously under a reduced residence time at 33.75 sec and high elimination capacity at 303.61 g center dot m(-3)center dot hr(-1) in the biotrickling reactor for about 260 days. In this case, predomestication combined with reinforcing of microorganisms was very important to obtaining high-efficiency results. Analysis of microbial diversity and functional prediction indicated a gradient distribution along with the concentration of xylene. This implied a rational design of microbial reagent and optimizing the inoculation of different sites of reactor could reduce the preparation period of the technology.
机译：二甲苯是许多挥发性工业污染源的主要成分，使用生物技术去除挥发性有机化合物（VOC）已成为一种增长趋势。在这项研究中，开发了一种以活性污泥为原料的气态二甲苯处理生物滴滤池，以研究二甲苯的生物降解过程。优化反应条件，并进行长期操作。最佳pH值为7.0，气液比为15：1（v / v），温度为25摄氏度。进行了高通量测序技术，分析了该菌的上层，中层和底层的微生物群落。反应堆。阐明了微生物多样性的特征，并预测了微生物的功能。结果表明，去除效率（RE）稳定在86％-91％，最大消除能力（EC）为303.61 g中心点m（-3）中心点hr（-1），停留时间为33.75 sec，初始入口二甲苯浓度为3000 mg中心点m（-3），这是已知的最高降解浓度。对二甲苯降解的动力学分析表明，这是一个非常高效的生物过程。在固定相中，r（max）为1059.8 g中心点m（-3）中心点hr（-1），K-s值为4.78 g中心点m（-3）。此外，底层和顶层的微生物群落结构显着不同：假单胞菌是底层的优势菌，而鞘氨醇则是顶层的优势菌。结果表明，二甲苯的中间代谢产物可能影响群落结构的分布。假单胞菌可以适应高浓度二甲苯污染的环境。启示：我们在生物滴滤池上结合了驯化的活性污泥和强化的微生物制剂。该系统在减少的停留时间（33.75秒）和在生物滴滤反应器中的303.61 g中心点m（-3）中心点hr（-1）的高清除能力下连续执行约260天。在这种情况下，优势化与微生物强化相结合对于获得高效结果非常重要。微生物多样性分析和功能预测表明，梯度分布与二甲苯浓度一起。这暗示着微生物试剂的合理设计，优化反应器不同部位的接种可减少该技术的制备时间。

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  • 来源
    《Journal of the air & waste management association》 |2019年第9期|1059-1069|共11页
  • 作者

    Li Mingxue; Shi Yantao; Li Yixuan; Sun Yizhe; Song Chunhui; Huang Zhiyong; Yang Zongzheng; Han Yifan;

  • 作者单位

    Tianjin Univ Sci & Technol, Coll Marine & Environm Sci, Tianjin, Peoples R China;

    SwanShine Tianjin Biotechnol & Dev Ltd, R&D Dept, Tianjin, Peoples R China;

    SwanShine Tianjin Biotechnol & Dev Ltd, R&D Dept, Tianjin, Peoples R China;

    Tianjin Univ Sci & Technol, Coll Chem Engn & Mat Sci, Tianjin, Peoples R China;

    Univ Lanzhou, Sch Earth Sci, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou, Gansu, Peoples R China;

    Chinese Acad Sci, Tianjin Inst Ind Biotechnol, Tianjin Key Lab Ind Biol Syst & Bioproc Engn, Tianjin, Peoples R China;

    Tianjin Univ Sci & Technol, Tianjin Key Lab Brine Chem Engn & Resource Ecouti, Tianjin, Peoples R China;

    Chinese Acad Sci, Tianjin Inst Ind Biotechnol, Tianjin Key Lab Ind Biol Syst & Bioproc Engn, Tianjin, Peoples R China;

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