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首页> 外文期刊>Mathematical Problems in Engineering >Simulation of Floe Size Distribution in Flocculation of Activated Sludge Using Population Balance Model with Modified Expressions for the Aggregation and Breakage
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Simulation of Floe Size Distribution in Flocculation of Activated Sludge Using Population Balance Model with Modified Expressions for the Aggregation and Breakage

机译：用群体平衡模型对植物平衡模型进行植物泥浆絮凝絮凝物的仿真分析

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摘要

The floc size distribution of activated sludge was simulated successfully by population balance model in the previous study (Population Balance Model and Calibration Method for Simulating the Time Evolution of Floc Size Distribution of Activated Sludge Flocculation. Desalination and Water Treatment, 67, 41-50). However, nonignorable errors exist in the simulation for the volume percentage of large flocs. This paper describes the application of a modified population balance model in the simulation of the time evolution of floc size distribution in activated sludge flocculation process under shear-induced conditions. It was found that the application of modified size dependent collision efficiency, modified breakage rate expression by assuming a maximum value, and binominal daughter-particles distribution function could improve the population balance model for activated sludge flocculation and successfully predict the dynamic changes in volume percentage distribution and mean floc size of activated sludge under different shear conditions. The results demonstrate that the maximum breakage rate was independent on the velocity gradient, and both the collision efficiency and breakage rate coefficient show a power-law relationship with the average velocity gradient; the former decreases while the latter increases with the rise of the average velocity gradient. These findings would help to understand the dynamics of activated sludge flocculation.
机译：通过先前的研究中的人口平衡模型成功模拟了活性污泥的絮状尺寸分布（人口平衡模型和用于模拟活性污泥絮凝的絮凝剂尺寸分布时间演变的校准方法。海水淡化和水处理，67,41-50） 。然而，对于大型絮絮的体积百分比，在模拟中存在不可能的错误。本文介绍了修改的人口平衡模型在剪切诱导条件下激活污泥絮凝过程中絮凝尺寸分布的时间演化模拟的应用。发现修改尺寸依赖性碰撞效率，通过假设最大值进行修改破裂率表达，以及二进制子粒子分布函数可以改善活性污泥絮凝的人口平衡模型，并成功预测体积百分比分布的动态变化不同剪切条件下活性污泥的平均絮凝大小。结果表明，最大破损率在速度梯度上是独立的，并且碰撞效率和破损率系数都显示出与平均速度梯度的动力法关系;前者随着平均速度梯度的升高而增加。这些调查结果将有助于了解活性污泥絮凝的动态。

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  • 来源
    《Mathematical Problems in Engineering》 |2019年第16期|5243860.1-5243860.10|共10页
  • 作者

    Li Zhenliang; Lu Peili; Zhang Daijun; Song Fuzhong;

  • 作者单位

    Chongqing Res Acad Environm Sci Chongqing 401147 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China|Chongqing Univ Dept Environm Sci Chongqing 400044 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China|Chongqing Univ Dept Environm Sci Chongqing 400044 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China|Chongqing Univ Dept Environm Sci Chongqing 400044 Peoples R China;

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