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首页> 外文期刊>Environmental Science & Technology >Response of Anaerobic Granular Sludge to a Shock Load of Zinc Oxide Nanoparticles during Biological Wastewater Treatment
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Response of Anaerobic Granular Sludge to a Shock Load of Zinc Oxide Nanoparticles during Biological Wastewater Treatment

机译：生物废水处理过程中厌氧颗粒污泥对氧化锌纳米颗粒冲击负荷的响应

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摘要

The increasing use of zinc oxide nanoparticles (ZnO NPs) in consumer and industrial products highlights a need to understand their potential environmental impacts. In this study, the response of anaerobic granular sludge (AGS) to a shock load of ZnO NPs during anaerobic biological wastewater treatment was reported. It was observed that the extracellular polymeric substances (EPS) of AGS and the methane production were not significantly influenced at ZnO NPs of 10 and 5O mg per gram of total suspended solids (mg/g-TSS), but they were decreased when the dosage of ZnO NPs was greater than 100 mg/g-TSS. The visualization of EPS structure with multiple fluorescence labeling and confocal User scanning microscope revealed that ZnO NPs mainly caused the decrease of proteins by 69.6%. The Fourier transform infrared spectroscopy analysis further indicated that the C-O-C group of polysaccharides and carboxyl group of proteins in EPS were also changed in the presence of ZnO NPs. The decline of EPS induced by ZnO NPs resulted in their deteriorating protective role on the inner microorganisms of AGS, which was in correspondence with the observed lower general physiological activity of AGS and the death of microorganisms. Further investigation showed that the negative influence of ZnO NPs on methane production was due to their severe inhibition on the methanization step.
机译：消费和工业产品中氧化锌纳米颗粒（ZnO NPs）的使用越来越多，这凸显了了解其潜在环境影响的需求。在这项研究中，报告了厌氧生物污泥处理过程中厌氧颗粒污泥（AGS）对ZnO NPs冲击负荷的响应。观察到，在每克总悬浮固体（mg / g-TSS）的ZnO NPs为10和5O mg时，AGS的细胞外聚合物（EPS）和甲烷的产生不会受到显着影响，但是当剂量增加时它们会降低ZnO NPs的含量大于100 mg / g-TSS。使用多个荧光标记和共聚焦用户扫描显微镜对EPS结构进行可视化显示，ZnO NPs主要导致蛋白质减少了69.6％。傅立叶变换红外光谱分析进一步表明，在ZnO NPs存在下，EPS中多糖的C-O-C基团和蛋白质的羧基也发生了变化。 ZnO NPs诱导EPS的下降导致其对AGS内部微生物的保护作用下降，这与观察到的AGS总体生理活性较低和微生物死亡有关。进一步的研究表明，ZnO NPs对甲烷产生的负面影响是由于它们对甲烷化步骤的严重抑制。

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  • 来源
    《Environmental Science & Technology》 |2012年第11期|p.5997-6003|共7页
  • 作者

    Hui Mu; Xiong Zheng; Yinguang Chen; Hong Chen; Kun Liu;

  • 作者单位

    State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China;

  • 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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