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首页> 外文期刊>Environmental Science & Technology >Free Nitrous Acid (FNA)-Based Pretreatment Enhances Methane Production from Waste Activated Sludge
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Free Nitrous Acid (FNA)-Based Pretreatment Enhances Methane Production from Waste Activated Sludge

机译：基于游离亚硝酸（FNA）的预处理可提高废活性污泥的甲烷生产量

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摘要

Anaerobic digestion of waste activated sludge (WAS) is currently enjoying renewed interest due to the potential for methane production. However, methane production is often limited by the slow hydrolysis rate and/or poor methane potential of WAS. This study presents a novel pretreatment strategy based on free nitrous acid (FNA or HNO_2) to enhance methane production from WAS. Pretreatment of WAS for 24 h at FNA concentrations up to 2.13 mg N/L substantially enhanced WAS solubilization, with the highest solubilization (0.16 mg chemical oxygen demand (COD)/mg volatile solids (VS), at 2.13 mg HNO_2-N/L) being six times that without FNA pretreatment (0.025 mg COD/mg VS, at 0 mg HNO_2-N/L). Biochemical methane potential tests demonstrated methane production increased with increased FNA concentration used in the pretreatment step. Model-based analysis indicated FNA pretreatment improved both hydrolysis rate and methane potential, with the highest improvement being approximately 50% (from 0.16 to 0.25 d~(-1)) and 27% (from 201 to 255 L CH_4/kg VS added), respectively, achieved at 1.78-2.13 mg HNO_2-N/L. Further analysis indicated that increased hydrolysis rate and methane potential were related to an increase in rapidly biodegradable substrates, which increased with increased FNA dose, while the slowly biodegradable substrates remained relatively static.
机译：由于产生甲烷的潜力，厌氧消化活性污泥（WAS）的兴趣正在重新受到关注。但是，甲烷的生产通常受WAS水解速度慢和/或甲烷潜力低的限制。这项研究提出了一种基于游离亚硝酸（FNA或HNO_2）的新型预处理策略，以提高WAS的甲烷产量。在FNA浓度高达2.13 mg N / L的情况下将WAS预处理24小时，大大增强了WAS的增溶作用，增溶效果最高（0.13 mg化学需氧量（COD）/ mg挥发性固体（VS），在2.13 mg HNO_2-N / L ）是未进行FNA预处理的六倍（0.025 mg COD / mg VS，在0 mg HNO_2-N / L时）。生化甲烷潜力测试表明，随着预处理步骤中FNA浓度的增加，甲烷的产量也随之增加。基于模型的分析表明，FNA预处理可同时提高水解速率和甲烷潜力，最高改进约为50％（从0.16到0.25 d〜（-1））和27％（从201到255 L CH_4 / kg V​​S添加）分别达到1.78-2.13 mg HNO_2-N / L。进一步的分析表明，水解速率和甲烷潜力的增加与快速可生物降解的底物的增加有关，随着FNA剂量的增加而增加，而缓慢可生物降解的底物保持相对静态。

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  • 来源
    《Environmental Science & Technology》 |2013年第20期|11897-11904|共8页
  • 作者

    Qilin Wang; Liu Ye; Guangming Jiang; Paul D. Jensen; Damien J. Batstone; Zhiguo Yuan;

  • 作者单位

    Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia School of Chemical Engineering, The University of Queensland, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia;

    Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia;

  • 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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