Investigating the use of cooling surfaces in solid-state fermentation tray bioreactors: modelling and experimentation
Investigating the use of cooling surfaces in solid-state fermentation tray bioreactors: modelling and experimentation
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研究固态发酵盘生物反应器中冷却表面的使用：建模和实验
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
D. Mitchell
中科院分区：
文献类型：
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作者：
M. Khanahmadi;R. Roostaazad;A. Safekordi;R. Bozorgmehri;D. Mitchell
以小麦麸皮为基质培养尼日尔ATCC 10 864，研究了塔壁冷却对固态发酵罐的影响。监测床中的温度、湿度、pH和葡糖淀粉酶活性。换热器板的应用降低了总的水损失，但增加了床层中水分分布的不均匀性。水分含量显着增加接近传热板，而床的上部区域干燥。床的热导率测量为0.19 W m-1 K-1。在这些条件下，取决于空气流速，58-82%的代谢热通过朝向板的传导被去除。一个数学模型来描述系统的行为。模型预测与实验结果吻合良好。水蒸气和氧气在床层中的扩散系数估计分别约为1.3 × 10−5 m2 s−1和1 × 10−5 m2 s−1。基于这些值，数学模型描述了氧气和水蒸气扩散影响床中生物质生长和水分分布的方式。版权所有© 2004化学工业协会
The effect of wall cooling in tray-type solid-state fermenters was investigated by cultivation of Aspergillus niger ATCC 10 864 on wheat bran. Temperature, moisture, pH and glucoamylase activity in the bed were monitored. Application of the heat exchanger plate reduced the overall water loss but increased the heterogeneity of moisture distribution in the bed. Moisture content increased markedly close to the heat transfer plate while the upper regions of the bed dried out. The thermal conductivity of the bed was measured to be 0.19 W m−1 K−1. At these conditions and depending on the air flow rate, 58–82% of the metabolic heat was removed via conduction towards the plate. A mathematical model was developed to describe the behaviour of the system. Model predictions were in good agreement with the experimental results. Diffusion coefficients of water vapour and oxygen in the bed were estimated to be around 1.3 × 10−5 m2 s−1 and 1 × 10−5 m2 s−1 respectively. Based on these values the mathematical model describes the way oxygen and water vapour diffusion influences biomass growth and moisture distribution in the bed. Copyright © 2004 Society of Chemical Industry