Direct fermentation of potato starch wastewater to lactic acid by Rhizopus oryzae and Rhizopus arrhizus
Date
2005
Authors
Huang, L.
Jin, Bo
Lant, Paul
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Conference paper
Citation
7th World Congress of Chemical Engineering GLASGOW2005 incorporating the 5th European Congress of Chemical Engineering, 10-14 July 2005, pp. 425-425
Statement of Responsibility
Conference Name
World Congress on Chemical Engineering (7th : 2005 : Glasgow, Scotland)
Abstract
The biochemical kinetic of direct fermentation for lactic acid production by fungal species of Rhizopus arrhizus 3,6017 and Rhizopus oryzae 2,062 was studied with respect to growth pH, temperature and substrate. The direct fermentation was characterized by starch hydrolysis, accumulation of reducing sugar, and production of lactic acid and fungal biomass. Starch hydrolysis, reducing sugar accumulation, biomass formation and lactic acid production were affected with the variations in pH, temperature, and starch source and concentration. A growth condition with starch concentration approximately 20 g/l at pH 6.0 and 30 degrees C was favourable for both starch saccharification and lactic acid fermentation, resulting in lactic acid yield of 0.87-0.97 g/g starch associated with 1.5-2.0 g/l fungal biomass produced in 36 h fermentation. R. arrhizus 3,6017 had a higher capacity to produce lactic acid, while R. oryzae 2,062 produced more fungal biomass under similar conditions.
School/Discipline
School of Earth and Environmental Sciences