Kun Shan University Institutional Repository:Item 987654321/17458
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    题名: Role of mass transfer in overall substrate removal rate in a sequential aerobic sludge blanket reactor treating a non-inhibitory substrate
    作者: 黃汝賢
    关键词: Sequential aerobic sludge blanket reactor;Granule kinetics;Intra-granular diffusion;Kinetic model;Empirical model
    日期: 2011-10
    上传时间: 2012-09-10 15:33:57 (UTC+8)
    摘要: A laboratory study was undertaken to explore the role of mass transfer in overall substrate removal rate and the subsequent kinetic behavior in a glucose-fed sequential aerobic sludge blanket (SASB) reactor. At the organic loading rates (OLRs) of 2e8 kg chemical oxygen demand (COD)/m3-d, the SASB reactor removed over 98% of COD from wastewater. With an increase in OLR, the average granule diameter (dp ¼ 1.1e1.9 mm) and the specific oxygen utilization rate increased; whereas biomass density of granules and solids retention time decreased (13e32 d). The intrinsic and apparent kinetic parameters were evaluated using break-up and intact granules, respectively. The calculated COD removal efficiencies using the kinetic model (incorporating intrinsic kinetics) and empirical model (incorporating apparent kinetics) agreed well with the experimental results, implying that both models can properly describe the overall substrate removal rate in the SASB reactor. By applying the validated kinetic model, the calculated mass transfer parameter values and the simulated substrate concentration profiles in the granule showed that the overall substrate removal rate is intra-granular diffusion controlled. By varying different dp within a range of 0.1e3.5 mm, the simulated COD removal efficiencies disclosed that the optimal granular size could be no greater than 2.5 mm.
    關聯: Water Research, 45(15), 4562-4570
    显示于类别:[環境工程系所] 期刊論文


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