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Updated: Feb 15, 2026

Light-Controlled Fermentations for Microbial Chemical and Protein Production
Published on: March 22, 2022
Biohydrogen fermentation of galactose at various substrate concentrations in an immobilized system and its microbial
Periyasamy Sivagurunathan1, Arivalagan Pugazhendhi2, Gopalakrishnan Kumar3
1Green Energy Technology Research Group, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam.
Abstract:
The effects of substrate concentration on fermentative hydrogen production from galactose at a fixed hydraulic retention time of 12 h were investigated in an immobilized continuously stirred tank reactor. Peak hydrogen production rate and hydrogen yield of 9.57 L/L-d and 1.10 mol/mol galactoseadded, respectively, were obtained at a feed substrate concentration of 30 g/L and an organic loading rate of 60 L/L-d. Quantitative polymerase chain reaction analysis showed that the variations in the performance resulted primarily from metabolic alterations within the metabolism of the established microbial community rather than modifications in the population. The results obtained showed that optimal substrate concentration is essential for the efficient, continuous production of hydrogen from galactose.
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