INFLUENCE OF NITROGEN CONCENTRATION IN TH E PRODUCTION OF CITRIC-ACIDBY IMMOBILIZED ASPERGILLUS-NIGER IN A FLUIDIZED-BED REACTOR

In this work, the production of citric acid by immobilized Aspergillus niger operating in a fluided-bed reactor with completed recirculation had been studied. The immobilization technique employed was the adsor ption in polyurethane foam. In this conditions, the influence of the n itrogen had been analized. The evolution of production and comsuption along the fermentation time indicated that the better concentration (1 6 g/L) was arrived when operated with fed batch of nitrogen at concent ration in the reactor of 200 mg/L and aireation of 2 vvm.