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首页> 外文期刊>Environmental Science & Technology >Effect of Solids Retention Time on Effluent Dissolved Organic Nitrogen in the Activated Sludge Process: Studies on Bioavailability, Fluorescent Components, and Molecular Characteristics
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Effect of Solids Retention Time on Effluent Dissolved Organic Nitrogen in the Activated Sludge Process: Studies on Bioavailability, Fluorescent Components, and Molecular Characteristics

机译：固体污泥保留时间对活性污泥过程中废水中溶解的有机氮的影响：生物利用度，荧光成分和分子特性的研究

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摘要

Wastewater-derived dissolved organic nitrogen (DON) should be minimized by municipal wastewater treatment plants (MWWTPs) to reduce its potential impact on receiving waters. Solids retention time (SRT) is a key control parameter for the activated sludge (AS) process; however, knowledge of its impact on effluent DON is limited. This study investigated the effect of SRT on the bioavailability, fluorescent components, and molecular characteristics of effluent DON in the AS process. Four lab-scale AS reactors were operated in parallel at different SRTs (5, 13, 26, and 40 days) for treatment of primary treated wastewater collected from an MWWTP. Results showed the positive effect of prolonged SRT on DON removal. AS reactors during longer SRTs, however, cannot sequester the bioavailable DON (ABDON) and occasionally contribute to greater amounts of ABDON in the effluents. Consequently, effluent DON bioavailability increased with SRT ( R ~(2) = 0.619, p < 0.05, ANOVA). Analysis of effluent DON fluorescent components and molecular characteristics indicated that the high effluent DON bioavailability observed at long SRTs is contributed by the production of microbially derived nitrogenous organics. The results presented herein indicate that operating an AS process with a longer SRT cannot control the DON forms that readily stimulate algal growth.
机译：市政废水处理厂（MWWTP）应尽量减少废水中的溶解有机氮（DON），以减少其对接收水的潜在影响。固体停留时间（SRT）是活性污泥（AS）工艺的关键控制参数；然而，关于其对污水中DON的影响的知识是有限的。这项研究调查了SRT对AS工艺中出水DON的生物利用度，荧光成分和分子特性的影响。四个实验室规模的AS反应器在不同的SRT（5、13、26和40天）并行运行，以处理从MWWTP收集的一级处理废水。结果显示延长SRT对DON清除具有积极作用。但是，在较长的SRT期间，AS反应器无法隔离生物利用度的DON（ABDON），偶尔会导致废水中ABDON的含量增加。因此，污水中DON的生物利用度随SRT的增加而增加（R〜（2）= 0.619，p <0.05，方差分析）。对污水中DON荧光成分和分子特性的分析表明，在较长的SRT上观察到的污水中DON的高生物利用度是由微生物衍生的含氮有机物的产生引起的。本文提供的结果表明，使用较长SRT的AS工艺无法控制易于刺激藻类生长的DON形式。

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  • 来源
    《Environmental Science & Technology》 |2018年第6期|3449-3455|共7页
  • 作者

    Haidong Hu; Kewei Liao; Yuanji Shi; Lili Ding; Yan Zhang; Hongqiang Ren;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu PR 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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