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剪切应力对活性污泥絮体特征的影响

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韩云平, 刘俊新, 郭雪松. 剪切应力对活性污泥絮体特征的影响[J]. 环境工程学报, 2013, 7(5): 1601-1606.
引用本文: 韩云平, 刘俊新, 郭雪松. 剪切应力对活性污泥絮体特征的影响[J]. 环境工程学报, 2013, 7(5): 1601-1606.
shu
Han Yunping, Liu Junxin, Guo Xuesong. Influence of shear stress on characteristics of activated sludge flocs[J]. Chinese Journal of Environmental Engineering, 2013, 7(5): 1601-1606.
Citation: Han Yunping, Liu Junxin, Guo Xuesong. Influence of shear stress on characteristics of activated sludge flocs[J]. Chinese Journal of Environmental Engineering, 2013, 7(5): 1601-1606.
shu

剪切应力对活性污泥絮体特征的影响

  • 1.

    中国科学院生态环境研究中心,北京 100085

  • 基金项目:

    国家自然科学基金资助项目(51138009)

  • 中图分类号: X703.1

Influence of shear stress on characteristics of activated sludge flocs

  • 1.

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

  • Fund Project:

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  • 摘要: 采用具有自动控制系统可周期性改变搅拌速度的生物反应器处理生活污水,研究了剪切应力周期变化对活性污泥絮体特征及功能菌群分布的影响。结果表明,在相同的运行条件下,运行初期的污泥形态不规则,结构疏松,其内部各功能菌群丰度差异较大,污泥絮体粒径受剪切应力影响较大,最大和最小剪切应力下污泥平均粒径相差30 μm;随着反应器运行时间的延长,活性污泥絮体的粒径减小;到达运行稳定期,污泥粒径较小,但结构紧实,最大和最小剪切应力下污泥平均粒径相差仅为6 μm,说明剪切应力对污泥粒径的影响减弱,其主要作用在于维持污泥絮体相对稳定的三维结构及相对平衡的功能菌群分布。此外,处理效果研究也表明,稳定的污泥结构有助于污染物去除效率的提高。
    Abstract: The characteristics of activated sludge and distribution of functional flora were studied in different shear stress and periods in the bioreactor of sewage treatment with automatic control system to change the stirring speed periodically. The results showed that,under the same operational conditions, the characteristics of initial activated sludge were irregular form, loose structure and widely different abundance of functional flora. The influence of shear stress on the sludge size was violent, and gap of mean size was 30 μm between maximum and minimum shear stress. Along with the bioreactor operation, the mean size of activated sludge decreased. In stable period, the size of sludge flocs was smaller, but its structure was tight. The gap of mean size was only 6 μm between maximum and minimum shear stress. Results showed that the shear stress played an important role in maintaining stable 3-D structure and relative mean distribution of functional flora in stable phase. Research of treatment effect also showed that stable characteristic of activated sludge floc helped to removal efficiency of pollutants.
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  • 收稿日期:  2012-02-01
  • 刊出日期:  2013-05-22
韩云平, 刘俊新, 郭雪松. 剪切应力对活性污泥絮体特征的影响[J]. 环境工程学报, 2013, 7(5): 1601-1606.
引用本文: 韩云平, 刘俊新, 郭雪松. 剪切应力对活性污泥絮体特征的影响[J]. 环境工程学报, 2013, 7(5): 1601-1606.
shu
Han Yunping, Liu Junxin, Guo Xuesong. Influence of shear stress on characteristics of activated sludge flocs[J]. Chinese Journal of Environmental Engineering, 2013, 7(5): 1601-1606.
Citation: Han Yunping, Liu Junxin, Guo Xuesong. Influence of shear stress on characteristics of activated sludge flocs[J]. Chinese Journal of Environmental Engineering, 2013, 7(5): 1601-1606.
shu

剪切应力对活性污泥絮体特征的影响

  • 1. 中国科学院生态环境研究中心,北京 100085
  • 收稿日期:  2012-02-01
基金项目:

国家自然科学基金资助项目(51138009)

摘要: 采用具有自动控制系统可周期性改变搅拌速度的生物反应器处理生活污水,研究了剪切应力周期变化对活性污泥絮体特征及功能菌群分布的影响。结果表明,在相同的运行条件下,运行初期的污泥形态不规则,结构疏松,其内部各功能菌群丰度差异较大,污泥絮体粒径受剪切应力影响较大,最大和最小剪切应力下污泥平均粒径相差30 μm;随着反应器运行时间的延长,活性污泥絮体的粒径减小;到达运行稳定期,污泥粒径较小,但结构紧实,最大和最小剪切应力下污泥平均粒径相差仅为6 μm,说明剪切应力对污泥粒径的影响减弱,其主要作用在于维持污泥絮体相对稳定的三维结构及相对平衡的功能菌群分布。此外,处理效果研究也表明,稳定的污泥结构有助于污染物去除效率的提高。

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