Fig. 1.

Schematic presentation of experimental set up of the reactor vessel with retentostat finger. The medium (3) kept under N₂/CO₂ (1 and 2) and benzene (4) were continuously added to the N₂/CO₂ flushed (5 and 6) continuous culture (7). The recirculation batch (8) with retentostat finger (9) was used to filter (0.22 μm pore size) the liquid phase pumped to the effluent tank (11). Gas is released from the effluent tank directly to the atmosphere (10). Due to the pressure difference liquid is flowing back from the recirculation batch to the continuous culture (7)