A COMPARATIVE-STUDY OF MASS-TRANSFER IN YEAST FOR A BATCH PULSED BAFFLED BIOREACTOR AND A STIRRED-TANK FERMENTER

We report experimental data of mass transfer of oxygen into yeast re-s uspension and yeast culture in a batch pulsed baffled bioreactor and a stirred tank (ST) fermenter. Air bubbles are sparged into the bottom of both reactors and the kinetics of the liquid oxygen concentration f ollowed using dissolved oxygen probes together with the dynamic gassin g-out technique for both systems. The k(L)a measurements and correlati on with power density calculations for yeast re-suspension show that t he k(L)a data in the pulsed baffled bioreactor are on average 75% high er than those obtained in the ST fermenter. Similar trends for k(L)a a re also measured when yeast culture of different ages were used in the two systems.