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Influence of Forced Internal Air Circulation on Airflow Distribution and Heat Transfer in a Gas Double-dynamic Solid-state Fermentation Bioreactor

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Abstract

Internal air circulation affects the temperature field distribution in a gas double-dynamic solid-state fermentation bioreactor (GDSFB). To enhance heat transfer through strengthening internal air circulation in a GDSFB, we put an air distribution plate (ADP) into the bioreactor and studied the effects of forced internal air circulation on airflow, heat transfer, and cellulase activity of Trichoderma viride L3. Results showed that ADP could help form a steady and uniform airflow distribution, and with gas-guide tubes, air reversal was formed inside the bioreactor, thus resulting in a smaller temperature difference between medium and air by enhancing convective heat transfer inside the bioreactor. Using an ADP of 5.35 % aperture ratio caused a 1 °C decrease in the average temperature difference during the solid-state fermentation process of T. viride L3. Meanwhile, the cellulase activity of T. viride L3 increased by 13.5 %. The best heat-transfer effect was attained when using an ADP of 5.35 % aperture ratio and setting the fan power to 125 V (4.81 W) in the gas double-dynamic solid-state fermentation (GDSF) process. An option of suitable aperture ratio and fan power may be conducive to ADPs’ industrial amplification.

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Acknowledgments

This work was financially supported by the National Basic Research Program of China (973 Project, no. 2011CB707401), the National High Technology Research and Development Program (863 Program, SS2012AA022502), and the National Key Project of Scientific and Technical Supporting Program of China (no. 2011BAD22B02).

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Authors and Affiliations

  1. State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, 1 North 2nd Ave, Beijing, 100190, China

    Hongzhang Chen, Lanzhi Qin & Hongqiang Li

  2. University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China

    Lanzhi Qin

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  1. Hongzhang Chen
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  2. Lanzhi Qin
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  3. Hongqiang Li
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Correspondence to Hongzhang Chen.

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Chen, H., Qin, L. & Li, H. Influence of Forced Internal Air Circulation on Airflow Distribution and Heat Transfer in a Gas Double-dynamic Solid-state Fermentation Bioreactor. Appl Biochem Biotechnol 172, 2218–2226 (2014). https://doi.org/10.1007/s12010-013-0670-8

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  • DOI: https://doi.org/10.1007/s12010-013-0670-8

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