Abstract
Continuous lactic acid production using immobilized L. delbrueckii was investigated. To evaluate the performance of the liquid-solid fluidized bed reactor using immobilized cells, the release rate of free cells from support surfaces and contribution of the free cells, which co-exist with immobilized cells in the broth, to lactic acid production were studied quantitatively. The results showed that the free cells played an important role at low dilution rate. If the dilution rate was increased, the effect of free cells on lactic acid production decreased quickly. Increasing the holdup of immobilized particles in the reactor lowered the contribution of free cells to the lactic acid production. Finally, the performance of the reactor was studied under the conditions of low growth nutrients. The results suggested that there was more active cell growth within the gel beads in the fluidized bed reactor than in the cell recycle reactor using membrane.
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