Continuous culture systems involving Zymomonas mobilisand a hollow fiberfilter module

Abstract

Culture systems involving the use of one or two fermenters in series, with cell recycle employing hollow fiber filter modules to achieve high cell densities, were developed. Dilution rates of about 0.6 h -1 and ethanol productivity values of about 25 g/l h -1 , with residual glucose at 0.9 g/l, could be achieved using the system employing one fermenter.