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Enhanced biological nitrogen removal in MLE combined with post-denitrification process and EF clarifier

机译：结合后反硝化过程和EF澄清剂提高MLE中的生物脱氮

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摘要

A modified ludzack ettinger reactor (MLE) combined with a post-denitrification reactor (PDMLE) using electroflotation (EF) as a secondary clarifier was investigated on its feasibility and process performance. Results indicated that higher mixed liquor suspended solids (MLSS) concentrations in bioreactor (5,350 ± 352 mg L~(-1)) were maintained via the highly concentrated return sludge (16,771 ±991 mg L~(-1) from the EF clarifier and the effluent suspended solids (SS) concentrations continued relatively low, representing effluent SS concentration of 1.71 ± 1.16 mg L~(-1), compared with GS-A2O process during the operation of four months. The denitrification was improved by combining MLE process with post-denitrification based on endogenous decay (i.e. no additional carbon source was added), resulting in the removal efficiencies of TN were about 91 and 59% for the influent C/N ratio of 10 and 5, respectively, revealing relatively high nitrogen removal as compared with EF-A2O and gravity settling (GS)-A2O processes as a control. The nitrogen balance analysis indicates that pre-denitrification and post-denitrification contributed to 78 and 22% of TN removed, respectively.
机译：研究了使用电浮法（EF）作为辅助澄清剂的改良式卢兹克·埃特金格反应器（MLE）与后脱硝反应器（PDMLE）的可行性和工艺性能。结果表明，通过EF澄清器和高浓度的回流污泥（16,771±991 mg L〜（-1））可以保持生物反应器中较高的混合液悬浮固体（MLSS）浓度（5,350±352 mg L〜（-1））。与GS-A2O工艺相比，在四个月的运行中，污水中悬浮物（SS）的浓度持续较低，SS的浓度为1.71±1.16 mg L〜（-1）。基于内源性衰减的后脱氮（即不添加额外的碳源），导致进水C / N比分别为10和5时，TN的去除效率分别约为91％和59％，表明氮去除率相对较高。与EF-A2O和重力沉降（GS）-A2O工艺相比，氮平衡分析表明脱氮前和脱氮后分别去除了78％和22％的TN。

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  • 来源
    《Bioprocess and Biosystems Engineering》 |2012年第4期|p.503-511|共9页
  • 作者

    C. M. Chung; K. W. Cho; Y. J. Kim; K. Yamamoto; T. H. Chung;

  • 作者单位

    Department of Urban Engineering, The University of Tokyo,7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan;

    Water Environment Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang,Seoul 130-650, Republic of Korea;

    R&D Center, POSCO E&C, 36-1 Songdodong,Younsugu, Incheon, Republic of Korea;

    Environmental Science Center, The University of Tokyo,7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan;

    Department of Civil and Environmental Engineering,Seoul National University, Gwanak 599 Gwanak-ro,Gwanak-gu, Seoul 151-742, Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    modified ludzack ettinger; post-denitrification; electroflotation; nitrogen removal;

    机译：改性的卢扎克·埃廷格;反硝化;电浮选;脱氮;

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