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Study on enhancing sludge methanogenesis by adding acetylene black and effect on the characteristics & microbial community of anaerobic granular sludge

机译：添加乙炔黑和厌氧粒状污泥特性和微生物群落增强污泥甲状腺炎的研究

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摘要

The effect of acetylene black (ACET) as additives on methane production, extracellular polymeric substances (EPS), microbial community structure and methanogenesis pathway during sludge anaerobic digestion (AD) was investigated in this study. The results indicated that the addition of 2 g L-1 ACET resulted in a 44.36% increase in methane accumulation. ACET, which resulted in the increase of EPS and VSS/TSS by 4.71-50.64%, effectively improved the physicochemical properties of anaerobic granular sludge (AnGS). During anaerobic digestion, the high throughput sequencing presented direct evidence that the ACET increased microbial diversity and enriched functional microorganisms such as norank_f__Synergistaceae, norank_f__Anaerolineaceae, and unclassified_f__Clostridiaceae_3, which can improve the hydrolysis acidification process and the acetotrophic pathway. These results were reaffirmed by applying metagenome inference and gene content inference (16S function prediction). Microscopically, significant enhancement in the AD efficiency can be due to the methanogenesis promoted by the ACET that can construct direct interspecies electron transfer (DIET) between the unclassified_f__Clostridiaceae_3, norank_f__Anaerolineaceae, and Methanosaeta. These results were expected to provide primary research data for improving the performance of anaerobic reactors and the development of microbial fuel cells.
机译：乙炔黑（ACET）作为污泥厌氧消化（AD）期间，对甲烷产生的添加剂，胞外聚合物质（EPS），微生物群落结构和产甲烷途径中的作用在该研究中进行了研究。结果表明，在加入2克L-1 ACET导致甲烷的积累增加了44.36％。 ACET，这导致由4.71-50.64％的增加EPS和VSS / TSS的，有效地改善了颗粒污泥（AnGS）的物理化学性质。在厌氧消化中，高通量测序给出直接的证据表明，增加ACET微生物多样性和丰富功能微生物如norank_f__Synergistaceae，norank_f__Anaerolineaceae和unclassified_f__Clostridiaceae_3，从而可以提高水解酸化过程和acetotrophic通路。这些结果通过施加宏基因组推断和基因含量推断（16S函数预测）重申。在显微镜下，在AD效率显著增强可以是由于unclassified_f__Clostridiaceae_3，norank_f__Anaerolineaceae，和Methanosaeta之间由ACET可以构造直接种间的电子转移（DIET）促进甲烷生成。这些结果有望用于提高厌氧反应器的性能和微生物燃料电池的发展提供了基础研究数据。

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  • 来源
    《RSC Advances》 |2019年第40期|共10页
  • 作者

    Ma Haitong; Wu Ming; Liu Hui; Wang Zhiwei; Guo Chenyan; Wang Shuangfei;

  • 作者单位

    Guangxi Univ Coll Light Ind &

    Food Engn Nanning 530004 Peoples R China;

    Guangxi Univ Coll Light Ind &

    Food Engn Nanning 530004 Peoples R China;

    Guangxi Univ Coll Light Ind &

    Food Engn Nanning 530004 Peoples R China;

    Guangxi Univ Coll Light Ind &

    Food Engn Nanning 530004 Peoples R China;

    Guangxi Univ Coll Light Ind &

    Food Engn Nanning 530004 Peoples R China;

    Guangxi Univ Coll Light Ind &

    Food Engn Nanning 530004 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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