Biohydrogen production from xylose at extreme thermophilic temperatures (70 degrees C) by mixed culture fermentation

Water Research
Prawit KongjanIrini Angelidaki

Abstract

Biohydrogen production from xylose at extreme thermophilic temperatures (70 degrees C) was investigated in batch and continuous-mode operation. Biohydrogen was successfully produced from xylose by repeated batch cultivations with mixed culture received from a biohydrogen reactor treating household solid wastes at 70 degrees C. The highest hydrogen yield of 1.62+/-0.02 mol-H2/mol-xylose(consumed) was obtained at initial xylose concentration of 0.5 g/L with synthetic medium amended with 1g/L of yeast extract. Lower hydrogen yield was achieved at initial xylose concentration higher than 2g/L. Addition of yeast extract in the cultivation medium resulted in significant improvement of hydrogen yield. The main metabolic products during xylose fermentation were acetate, ethanol, and lactate. The specific growth rates were able to fit the experimental points relatively well with Haldane equation assuming substrate inhibition, and the following kinetic parameters were obtained: the maximum specific growth rate (mu(max)) was 0.17 h(-1), the half-saturation constant (K(s)) was 0.75g/L, and inhibition constant (K(i)) was 3.72 g/L of xylose. Intermittent N2 sparging could enhance hydrogen production when high hydrogen partial pressure (> 0.1...Continue Reading

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Citations

Apr 27, 2010·Protein Engineering, Design & Selection : PEDS·Peter Q Nguyen, Jonathan J Silberg
Mar 7, 2013·Canadian Journal of Microbiology·Yogesh GoyalKalyan Gayen
Oct 12, 2010·Bioresource Technology·Gang LuoIrini Angelidaki
Dec 10, 2009·Biotechnology and Bioengineering·Prawit KongjanIrini Angelidaki
Nov 28, 2012·International Journal of Systematic and Evolutionary Microbiology·Ana Faria TomásIrini Angelidaki
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Jul 15, 2021·World Journal of Microbiology & Biotechnology·Suren L J Wijeyekoon, Alankar A Vaidya

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