Filament content threshold for activated sludge bulking: Artifact or reality?
Filament content threshold for activated sludge bulking: Artifact or reality?
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DOI：
10.1016/j.watres.2007.06.021
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发表时间：
2007-11-01
期刊：
影响因子：
12.8
通讯作者：
Jassby, David
中科院分区：
文献类型：
--
作者：
Schuler, Andrew J.;Jassby, David
活性污泥沉降性的一个常见特征是存在丝状细菌的阈值含量，低于该阈值含量，丝状细菌对沉降性的影响相对较小，高于该阈值含量，沉降性对丝状细菌含量更加敏感。这个概念在历史上是基于沉降性/长丝含量曲线中的明显拐点。然而，这被证明是半对数尺度上的数据呈现的一种人为现象。对几个已发表的数据集的分析表明，当数据以线性尺度呈现时，特别是在150毫升/克污泥体积指数“阈值”附近，几乎没有或没有阈值效应的证据。相反，似乎有一个一般连续的（往往接近线性）之间的关系长丝含量和SVI，这表明阈值效应，因为通常认为，是不准确的。提出了一个修正的长丝含量与沉降性能的经验模型。(C)2007爱思唯尔有限公司保留所有权利。
An often-noted feature of activated sludge settleability is the existence of a threshold content of filamentous bacteria, below which filaments have a relatively small effect on settleability, and above which settleability is much more sensitive to filament content. This concept has historically been based on an apparent inflection point in settleability/filament content curves. However, this was demonstrated to be an artifact of data presentation on semilogarithmic scales. Analyses of several published data sets indicated that there was little or no evidence of a threshold effect when data were presented on linear scales, particularly around the 150 mL/g sludge volume index (SVI) "threshold". Rather, there appears to be a generally continuous (and often nearly linear) relationship between filament content and SVI, suggesting that the threshold effect, as commonly perceived, is not accurate. A modified empirical model of filament content and settleability was also presented. (C) 2007 Elsevier Ltd. All rights reserved.