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Biohydrogen production from molasses by anaerobic fermentation with a pilot-scale bioreactor system

  • Pennsylvania State University
  • Harbin Institute of Technology

Research output: Contribution to journalArticlepeer-review

Abstract

A pilot-scale study of biohydrogen production was performed in a continuous flow anaerobic fermentation reactor (with an available volume of 1.48 m3) for over 200 days. The hydrogen bio-producing reactor (HBR) system was operated under the organic loading rates (OLR) of 3.11-85.57 kg COD/m3reactor/d (COD: chemical oxygen demand) with molasses as the substrate. Both biogas and hydrogen yields increased with OLR at the range of 3.11-68.21 kgCOD / m3 d, but decreased at high OLR (68.21-85.57 kg COD/m3reactor/d). The biogas was mainly composed of CO2 and H2 with the percentage of H2 ranging from 40% to 52% in biogas. A maximum hydrogen production rate of 5.57 m3 H2 / m3 reactor / d, with a specific hydrogen production rate of 0.75 m3 H2 / kg MLVSS / d, was obtained in the reactor. The hydrogen yield reached 26.13 mol / kg CODremoved within OLR range of 35-55 kg COD/m3reactor/d. In addition, it was found that the hydrogen yield was affected by the presence of ethanol and acetate in the liquid phase, and the maximum hydrogen production rate occurred while the ratio of ethanol to acetate was close to 1, due to the adjustment of NAD+ / (NADH + H+) through fermentation pathways. Ethanol-type fermentation was favorable for hydrogen production.

Original languageEnglish
Pages (from-to)2147-2157
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume31
Issue number15
DOIs
StatePublished - Dec 2006

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 7 - Affordable and Clean Energy
    SDG 7 Affordable and Clean Energy

Keywords

  • Acetic acid
  • Anaerobic fermentation
  • Biohydrogen
  • Continuous flow
  • Ethanol
  • Hydrogen production rate
  • NADH
  • Organic loading rate
  • Pilot-scale

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