Bubble coalescence suppression driven carbon monoxide (CO)-water mass transfer increase by electrolyte addition in a hollow fiber membrane bioreactor (HFMBR) for microbial CO conversion to ethanol.

This study investigated the effects of electrolytes (CaCl, KHPO, MgSO, NaCl, and NHCl) on CO mass transfer and ethanol production in a HFMBR. The hollow fiber membranes (HFM) were found to generate tiny gas bubbles; the bubble coalescence was significantly suppressed in electrolyte solution. The volumetric gas-liquid mass transfer coefficients (ka) increased up to 414% compared to the control. Saturated CO (C) decreased as electrolyte concentrations increased. Overall, the maximum mass transfer rate (R) in electrolyte solution ranged from 106% to 339% of the value obtained in water. The electrolyte toxicity on cell growth was tested using Clostridium autoethanogenum. Most electrolytes, except for MgSO, inhibited cell growth. The HFMBR operation using a medium containing 1% MgSO achieved 119% ethanol production compared to that without electrolytes. Finally, a kinetic simulation using the parameters got from the 1% MgSO medium predicted a higher ethanol production compared to the control.