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Humic Acid Can Enhance the Mineralization of Phenanthrene Sorbed on Biochars

机译：腐殖酸可增强生物炭中菲的矿化作用

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摘要

Biodegradation of hydrophobic organic contaminants by bacteria has been widely studied, but how dissolved organic matter (DOM) may affect their removal if accumulated on biochars is poorly understood. To address this knowledge gap, microbial mineralization of phenanthrene (PHE) spiked on various biochars by Mycobacterium vanbaalenii PYR-1 in the presence of humic acid (HA, a model DOM) at two concentrations was investigated. Our findings showed that HA greatly increased the rate and extent of PHE mineralization. This could be attributed to enhanced PHE desorption by HA, which facilitated access to it by bacteria in the aqueous phase. Furthermore, the high HA affinity for PHE facilitated PHE flow toward the bacterial cells with HA acting as a carrier in the aqueous phase. The mineralization enhancement of PHE by HA within 480 h was negatively influenced by the aromatic carbon contents and micropore volumes in biochars. This shows the importance of the physicochemical properties of biochars in altering the HA effect. Results of this study provide novel information on how to achieve complete removal of PHE accumulated on biochars with a strong sorption affinity for it, using a microbial technique and natural DOM.
机译：细菌对疏水性有机污染物的生物降解作用已得到广泛研究，但是，如果积累在生物炭上，溶解性有机物（DOM）如何影响其去除效果却知之甚少。为了解决这一知识鸿沟，研究了在两种浓度的腐殖酸（HA，模型DOM）存在下，由范氏分枝杆菌PYR-1加标在各种生物炭上的菲（PHE）的微生物矿化作用。我们的发现表明，HA大大提高了PHE矿化的速度和程度。这可能归因于HA增强了PHE的解吸，这促进了水相中细菌对其的吸收。此外，HA对PHE的高亲和力有助于PHE流向细菌细胞，其中HA在水相中充当载体。 HA在480小时内对PHE的矿化作用增强受到生物炭中芳族碳含量和微孔体积的负面影响。这表明生物炭的理化性质在改变HA效应中的重要性。这项研究的结果提供了有关如何使用微生物技术和天然DOM完全去除生物炭上具有强烈吸附亲和力的PHE的新颖信息。

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  • 来源
    《Environmental Science & Technology》 |2019年第22期|13201-13208|共8页
  • 作者

    Zhang Meng; Shen Xiaofang; Zhang Haiyun; Werner David; Wang Bin; Yang Yu; Tao Shu; Wang Xilong;

  • 作者单位

    Peking Univ Coll Urban & Environm Sci Lab Earth Surface Proc Beijing 100871 Peoples R China|Nanjing Forestry Univ Coll Biol & Environm Coinnovat Ctr Sustainable Forestry Southern China Nanjing 210037 Jiangsu Peoples R China;

    Peking Univ Coll Urban & Environm Sci Lab Earth Surface Proc Beijing 100871 Peoples R China;

    Newcastle Univ Sch Civil Engn & Geosci Newcastle Upon Tyne NE1 7RU Tyne & Wear England;

    Peking Univ Sch Publ Hlth Dept Epidemiol & Biostat Beijing 100191 Peoples R China;

    Univ Nevada Dept Civil & Environm Engn Reno NV 89557 USA;

  • 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);
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  • 正文语种 eng
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