Buffiere P, Fonade C, Moletta R
Charge de Recherche, Institut National de la Recherche Agronomique, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, 11100 Narbonne, France.
Biotechnol Bioeng. 1998 Oct 5;60(1):36-43. doi: 10.1002/(sici)1097-0290(19981005)60:1<36::aid-bit4>3.0.co;2-1.
The influence of mixing and phase hold-ups on gas-producing fluidized-bed reactors was investigated and compared with an ideal flow reactor performance (CSTR). The liquid flow in the anaerobic fluidized bed reactor could be described by the classical axially dispersed plug flow model according to measurements of residence time distribution. Gas effervescence in the fluidized bed was responsible for bed contraction and for important gas hold-up, which reduced the contact time between the liquid and the bioparticles. These results were used to support the modeling of large-scale fluidized-bed reactors. The biological kinetics were determined on a 180-L reactor treating wine distillery wastewater where the overall total organic carbon uptake velocity could be described by a Monod model. The outlet concentration and the concentration profile in the reactor appeared to be greatly influenced by hydrodynamic limitations. The biogas effervescence modifies the mixing characteristics and the phase hold-ups. Bed contraction and gas hold-up data are reported and correlated with liquid and gas velocities. It is shown that the reactor performance can be affected by 10% to 15%, depending on the mode of operation and recycle ratio used. At high organic loading rates, reactor performance is particularly sensitive to gas effervescence effects. Copyright 1998 John Wiley & Sons, Inc.
研究了混合和相含率对产气流化床反应器的影响，并与理想流动反应器（连续搅拌釜式反应器，CSTR）的性能进行了比较。根据停留时间分布的测量结果，厌氧流化床反应器中的液体流动可用经典的轴向分散活塞流模型来描述。流化床中的气体逸出导致床体收缩和显著的气体含率，这减少了液体与生物颗粒之间的接触时间。这些结果被用于支持大型流化床反应器的建模。在处理葡萄酒厂废水的180升反应器上测定了生物动力学，其中总有机碳的整体摄取速度可用莫诺德模型来描述。反应器的出口浓度和浓度分布似乎受流体动力学限制的显著影响。沼气逸出改变了混合特性和相含率。报告了床体收缩和气体含率数据，并将其与液体和气体流速相关联。结果表明，根据操作模式和使用的循环比，反应器性能可能受到10%至15%的影响。在高有机负荷率下，反应器性能对气体逸出效应特别敏感。版权所有1998约翰威立父子公司。
