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首页> 外文期刊>The Science of the Total Environment >Effects of free nitrous acid and freezing co-pretreatment on sludge short-chain fatty acids production and dewaterability
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Effects of free nitrous acid and freezing co-pretreatment on sludge short-chain fatty acids production and dewaterability

机译：游离亚硝酸和冷冻共预处理对污泥短链脂肪酸产生和脱水能力的影响

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摘要

Short-chain fatty acids (SCFAs) as recoverable carbon source from waste activated sludge anaerobic fermentation process have aroused wide concern. In this study, free nitrous acid (FNA) and freezing pretreatments were combined to enhance SCFAs yield and fermented sludge dewaterability in the anaerobic fermentation system. The effects of different FNA concentrations and different freezing conditions (with or without curing stages) were analysed and compared. The results indicated that combining 1.07 mg N/L FNA with 48 h continuous freezing at -5 degrees C, raised SCFAs production from 6.7 mg COD/g volatile suspended solids (VSS) for the blank (no pretreatment) up to 124.0 mg COD/g VSS. In addition, the minimal water content of the treated fermented sludge cake was 78.11%, which was less than that of the blank (81.22%). SCFAs production and dewaterability enhancement could be attributed to sludge disintegration induced by the co-pretreatment, which led to sludge solubilisation, organics release, methanogenesis inhibition and particle size variation. This study implied that FNA and freezing co-pretreatment has the potential to enhance SCFAs production and sludge dewaterability in wastewater treatment plants. (C) 2019 Elsevier B.V. All rights reserved.
机译：短链脂肪酸（SCFAs）作为废活性污泥厌氧发酵过程中的可回收碳源引起了广泛关注。在这项研究中，结合了游离亚硝酸（FNA）和冷冻预处理以提高厌氧发酵系统中SCFA的产量和发酵污泥的脱水能力。分析和比较了不同FNA浓度和不同冷冻条件（有或没有固化阶段）的影响。结果表明，将1.07 mg N / L FNA与在-5摄氏度下连续48 h冷冻相结合，可将SCFA的生成量从6.7 mg COD / g的空白（无需预处理）挥发性悬浮固体（VSS）提高到124.0 mg COD / g VSS。此外，处理过的发酵污泥饼的最低含水量为78.11％，低于空白污泥的最低含水量（81.22％）。 SCFA的产生和脱水能力的提高可归因于共预处理引起的污泥分解，从而导致污泥溶解，有机物释放，甲烷生成抑制和粒径变化。这项研究表明，FNA和冷冻共预处理具有提高废水处理厂SCFA产量和污泥脱水能力的潜力。 （C）2019 Elsevier B.V.保留所有权利。

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  • 来源
    《The Science of the Total Environment》 |2019年第15期|600-607|共8页
  • 作者

    Wu Yuqi; Song Kang; Sun Xiaoyan; Li Lu; Wang Wenlin; Wang Qilin; Wang Dongbo;

  • 作者单位

    Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China;

    Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China;

    Nanjing Inst Environm Sci, Minist Environm Protect, Nanjing 210042, Jiangsu, Peoples R China;

    Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Ultimo, NSW 2007, Australia;

    Hunan Univ, Coll Environm Sci & Engn, Changsha 410082, Hunan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Waste activated sludge; Anaerobic fermentation; Freezing; Free nitrous acid; Short-chain fatty acids; Dewaterability;

    机译：废活性污泥;厌氧发酵;冷冻;游离亚硝酸;短链脂肪酸;脱水性;

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