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首页> 外文期刊>Environmental Science & Technology >Determination of the fractal dimension of microbial flocs from the change in their size distribution after breakage
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Determination of the fractal dimension of microbial flocs from the change in their size distribution after breakage

机译：从破碎后大小分布的变化确定微生物絮凝物的分形维数

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摘要

The fractal dimension is of ultimate importance in the description of the properties and behavior of microbial flocs in biological wastewater treatment systems. However, the methods for the measurement of the fractal dimension have not been well-established. In this study, a new method is developed to determine the fractal dimension of biological flocs in activated sludge (AS) suspensions. The new method utilizes the particle size distribution (PSD) of the sludge flocs measured by image processing under a microscope. Mechanical breakage is conducted for the sludge sample to create a change in the PSD. On the basis of the self-similarity of fractal aggregates, the fractal dimension of the AS flocs can be calculated from a comparison between the original PSD and the altered PSD by breakage. It is determined that the sludge flocs grown in laboratory bioreactors with sludge ages of 5, 10, and 20 days have fractal dimensions of 2.07, 2.21, and 2.36. The sludge collected from a full-scale AS treatment plant has a fractal dimension of 1.99. This new method overcomes the deficiencies of other existing methods. It is easier to use and provides more reliable results in the determination of the fractal dimension of biological flocs and other similar aggregate samples.
机译：在描述生物废水处理系统中微生物絮凝物的特性和行为时，分形维数至关重要。但是，分形维数的测量方法尚未建立。在这项研究中，开发了一种新方法来确定活性污泥（AS）悬浮液中生物絮凝物的分形维数。新方法利用了在显微镜下通过图像处理测量的污泥絮凝物的粒径分布（PSD）。对污泥样品进行机械破碎，以改变PSD。基于分形集合体的自相似性，可以通过比较原始PSD和通过破损而变化的PSD来计算AS絮凝物的分形维数。确定在实验室生物反应器中生长的污泥絮凝物的污泥年龄分别为5、10和20天，其分形维数为2.07、2.21和2.36。从大型AS处理厂收集的污泥的分形维数为1.99。这种新方法克服了其他现有方法的不足。在确定生物絮凝物和其他类似聚集体样品的分形维数时，它更易于使用并提供更可靠的结果。

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