Influence of Oxygen Mass Transfer on the Fermentation Behavior of Burkholderia Cepacia for Polyhydroxyalkanoates (PHAs) Production Utilizing Wood Extract Hydrolysate (WEH)

摘要

Wood extract hydrolysate of sugar maple (WEH) was used as fermentation feedstock for polyhydroxyalkanoates (PHAs) production by Burkholderia cepacia. The effect of insoluble particles in the medium on the oxygen mass transfer was studied. The oxygen mass transfer coefficient (K_La) increases significantly with particles removal. As a result, the fermentation behavior of B. cepacia was improved. The sugar consumption rate and biomass production rate increased from 0.38 g/(L·h) to 0.65 g/(L·h) and 0.047 g/(L·h) to 0.078 g/(L·h), respectively. The maximum biomass concentration achieved with particle-removed WEH was 7.25 g/L containing 60.55% PHA, compared to 4.61 g/L containing 43.63% PHA with untreated WEH.