摘要
A rotating disk contactor（RDC）was designed to perform L-lactic acid fermentation with afilamentous fungi,Rhizopus oryzae,which was immobilized on the surfaces of the rotating discs.Thebioreactor was operated using repeated-batch method as well as continuous feeding method.Ananionic resin,D354,slightly basic in nature and of high selectivity and capacity was chosen for lacticacid separation.A coupled process of L-lactic acid fermentation and ion-exchange separation wasevaluated experimentally.The results indicated that the pH value of the fermentation broth could bemaintained at about 3-3.5 without any addition of alkali.The conversion ratio of glucose to L-lacticacid was about 0.7 g·g<sup>-1</sup> and the fermentation rate reached as high as 62.5 g·h<sup>-1</sup>·m<sup>-2</sup>.
A rotating disk contactor(RDC) was designed to perform L-lactic acid fermentation with a filamentous fungi, Rhizopus oryzae, which was immobilized on the surfaces of the rotating discs. The bioreactor was operated using repeated-batch method as well as continuous feeding method. An anionic resin, D354, slightly basic in nature and of high selectivity and capacity was chosen for lactic acid separation. A coupled process of L-lactic acid fermentation and ion-exchange separation was evaluated experimentally. The results indicated that the pH value of the fermentation broth could be maintained at about 3 - 3.5 without any addition of alkali. The conversion ratio of glucose to L-lactic acid was about 0.7 g·g-1 and the fermentation rate reached as high as 62.5 g·h-1 · m-2.a
基金
Supported by the National Natural Science Foundation of China.
