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厌氧膨胀颗粒污泥床(EGSB)反应器水力混合特性研究
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摘要
本课题通过设计和运行小试EGSB反应器,对定有机负荷正常运行的反应器在不同升流速度条件下的颗粒污泥床特征及停留时间分布进行了实验研究,并在单参数流动模型(轴向扩散推流模型和多釜串联模型)拟合分析的基础上建立了多参数组合流动模型(GDMWB模型和CPDE模型)。
     研究结果表明:
     1)为持留较高浓度的污泥,维持理想的处理效果,实验EGSB反应器的升流速度应控制在2~4m/h。
     2)反应器内存在死区,升流速度的提高可以有效减少死区容积。
     3)轴向扩散系数和多釜串联级数随升流速度的变化仅能表达系统整体在时间上的相对混合程度为先减弱后增强,无法表达出反应器内空间上的混合特征。
     4)将EGSB反应器根据内部污泥床特征假设成颗粒污泥床层和澄清层的串联,从而建立组合模型是合理的;CPDE模型可以很好地拟合实验RTD曲线的拖尾。
     5)GDMWB模型在升流速度较高时更适合描述实验EGSB反应器的液相流动,而CPDE模型则更适合描述升流速度较低,死区容积较大时的反应器流态。
In this study, a lab-scale EGSB reactor was established and ran with certain organic loading rate, while experiments on the characteristics of expanded granular sludge bed and residence time distribution (RTD) were conducted under different superficial liquid upfiow velocities (vup) conditions. Two flow models with multiple parameters (GDMWB and CPDE) were established and simulated based on the analysis of the simulation results and deviations of two single-parameter flow models (DPF and TIS).
    Through these work, some conclusions can be drawn:
    1) The optimal range of liquid upfiow velocity (vup) is 2-4 m/h for the biomass retention and stable COD removal rate of the EGSB reactor.
    2) Dead zone exists in the EGSB reactor, whose volume can be reduced by increasing the
    Vup.
    3) The varity of axial dispersion coefficient (Dz/uL) and tank-in-series number (N) with the vup increased only has the relative meaning which imply the mixing intensity of the whole system decreased first and then increased in time domain. However, it can not interpret the mixing characteristics of the reactor in space domain.
    4) It is reasonable for developing the combined models by defining the reactor is composed of sludge bed and settling section in series. Moreover, model CPDE interpret the long tail of RTD curves perfectly.
    5) Model GDMWB is fit for simulation under high vup condition and model CPDE for low.
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