Effect of initial bacteria concentration on hydrogen gas production from cheese whey powder solution by thermophilic dark fermentation

Biotechnology Progress
Fikret KargiSerpil Ozmihci

Abstract

Dark fermentative hydrogen gas production from cheese whey powder solution was realized at 55°C. Experiments were performed at different initial biomass concentrations varying between 0.48 and 2.86 g L(-1) with a constant initial substrate concentration of 26 ± 2 g total sugar (TS) per liter. The highest cumulative hydrogen evolution (633 mL, 30°C), hydrogen yield (1.56 mol H(2) mol(-1) glucose), and H(2) formation rate (3.45 mL h(-1) ) were obtained with 1.92 g L(-1) biomass concentration. The specific H(2) production rate decreased with increasing biomasss concentration from the highest value (47.7 mL g(-1) h(-1) ) at 0.48 g L(-1) biomass concentration. Total volatile fatty acid concentration varied beetween 10 and 14 g L(-1) with the highest level of 14.2 g L(-1) at biomass concentration of 0.48 g L(-1) and initial TS content of 28.4 g L(-1) . The experimental data were correlated with the Gompertz equation and the constants were determined. The most suitable initial biomass to substrate ratio yielding the highest H(2) yield and formation rate was 0.082 g biomass per gram of TS.

References

Jul 29, 2003·Biotechnology Letters·Hong LiuHerbert H P Fang
Oct 11, 2003·Journal of Environmental Management·Tong ZhangHerbert H P Fang
Feb 25, 2005·Biodegradation·Hang-Sik Shin, Jong-Ho Youn
Oct 26, 2005·Journal of Biotechnology·Mongi FerchichiAmer Almadidy
Nov 17, 2006·Bioresource Technology·Dae-Yeol Cheong, Conly L Hansen
Jul 14, 2009·Bioresource Technology·Dogan KaradagJaakko A Puhakka

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