Author/Authors :
-، - نويسنده Biotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, I.R. Iran Shojaosadati, Seyed Abbas , -، - نويسنده Food Science and Industry Group, Department of Agriculture, Tarbiat Modares University, P.O. Box: 14115-336, Tehran, I.R. Iran Hamidi-Esfahani, Zohreh , -، - نويسنده Biotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, I.R. Iran Hejazi, Parisa , -، - نويسنده Biotechnology Group, Department of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, I.R. Iran Vasheghani-Farahani, Ebrahim , -، - نويسنده Food and Bioprocess Engineering Group, Agrotechnology and Food Sciences, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands Rinzema, Arian
Abstract :
Different control strategies of bed temperature and moisture were investigated using various inlet air temperatures and air fluxes in both the ordinary packed bed bioreactor (without cooling water in the jacket) and the bioreactor with cooling water in jacket. The experiments were carried out within a 1-L solid-state packed bed bioreactor in which Aspergillus niger was cultivated on wheat bran. On-line measurements of oxygen quantity in the outlet air and temperature of the bed and the inlet air flux were carried out in both types of the bioreactors. Effects of certain control strategies on fungal growth rate were compared in both the bioreactors. According to experimental results, using the bioreactor with the cooling water in the jacket is a better strategy for control of bed temperature and moisture during packed bed solid state fermentation. Cumulative oxygen consumption in this bioreactor was approximately 1.7 times higher than other control strategies used in this study.
