Fig. 4From: Development of a hybrid bio-purification process of lactic acid solutions employing an engineered E. coli strain in a membrane bioreactorCells’ growth profile in MBR 6 test obtained by online monitoring of OD600; shaded area corresponds to the batch operation of the MBR (1st stage) while arrows indicate the time points of the permeate/feeding cycles during the semi-continuous MBR operationBack to article page