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首页> 外文期刊>Advances in Environmental Technology >Hydrodynamics and mass transfer inthree-phase airlift reactors for activated Carbon and sludge filtration
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Hydrodynamics and mass transfer inthree-phase airlift reactors for activated Carbon and sludge filtration

机译：用于活性炭和污泥过滤的三相气举反应器的流体动力学和传质

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A bioreactor refers to any manufactured or engineered device that supports a biologically active environment. These kinds of reactors are designed to treat wastewater treatment. Volumetric mass transfer coefficient and the effect of superficial gas velocity, as the most important operational factor on hydrodynamics, in three-phase airlift reactors are investigated in this study. The experiments for the external airlift reactor were carried out at a 0.14 downcomer to riser cross-sectional area ratio, and for the internal reactor at 0.36 and 1. Air and water were used as the gas and liquid phases, respectively, as well as activated carbon/sludge particles as the solid phase. Increasing the superficial gas velocity resulted in greater liquid circulation velocity, gas hold-up, and volumetric mass transfer coefficient; increasing the suspended activated carbon particles resulted in a decreased concentration of activated sludge, downcomer to riser cross sectional area ratio, liquid velocity, gas hold-up and volumetric mass transfer coefficient. The maximum gas hold-up was 0.178 which was attained in the external airlift reactor with a 1 Wt. % of activated sludge at a gas superficial velocity of 0.25 (m/s). The maximum volumetric mass transfer coefficient was 0.0485 (l/s) that was observed in the external airlift reactor containing activated carbon with a 0.00032 solid hold-up. A switch was observed in the activated sludge airlift reactor flow regime at gas velocities higher than 0.15 (m/s) and 0.18 (m/s) in the activated carbon airlift reactors.
机译：生物反应器是指支持生物活性环境的任何制造或设计的设备。这些类型的反应器设计用于废水处理。研究了三相气举反应堆中体积传质系数和表观气体速度的影响，这是影响流体动力学的最重要因素。外部气举反应器的实验在降液管与立管的截面积之比为0.14的情况下进行，而内部反应器的实验则在0.36和1的条件下进行。空气和水分别用作气相和液相，并经活化碳/污泥颗粒作为固相。增加表观气体速度会导致更大的液体循环速度，气体滞留率和体积传质系数。增加悬浮的活性炭颗粒会导致活性污泥浓度降低，降液管与立管截面积之比下降，液体速度，气体滞留率和体积传质系数降低。最大气体滞留量为0.178，在外部气举反应器中达到1 Wt。气体表观速度为0.25（m / s）时活性污泥的％。最大体积传质系数为0.0485（l / s），这是在包含活性炭为0.00032的固体碳的外部气举反应器中观察到的。在活性污泥气提反应器的气流速率高于0.15（m / s）和0.18（m / s）的气体速度下，观察到了切换。

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