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Fermentative hydrogen production from pretreated biomass: a comparative study.

I A Panagiotopoulos¹, R R Bakker, M A W Budde

¹Bioresource Technology Unit, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, Athens GR-15700, Greece. iapan@chemeng.ntua.gr

Bioresource Technology

|August 7, 2009

Summary

Biomass feedstocks like barley straw and grains show potential for fermentative hydrogen production. Sugar beet extract and specific grain hydrolysates are effective, while corn stalk requires milder pretreatment for optimal results.

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Area of Science:

Biotechnology
Renewable Energy
Biochemical Engineering

Background:

Biomass valorization is key for sustainable energy.
Fermentative hydrogen production offers a clean energy alternative.
Optimizing feedstock utilization is crucial for economic viability.

Purpose of the Study:

To assess various biomass sources for fermentative hydrogen production.
To compare the efficacy of barley straw, corn stalk, grains, and sugar beet extract.
To identify optimal pretreatment and hydrolysis conditions for hydrogen yield.

Main Methods:

Mild-acid pretreatment and enzymatic hydrolysis of biomass.
Quantification of soluble sugars in hydrolysates.
Fermentability testing using the thermophilic bacterium Caldicellulosiruptor saccharolyticus.
Comparative evaluation of hydrogen production rates.

Main Results:

Barley straw, barley grains, corn grains, and sugar beet extract yielded significant soluble sugars.
Caldicellulosiruptor saccharolyticus demonstrated high hydrogen production from barley straw, barley grains, corn grains, and sugar beet extract.
Mild-acid pretreated corn stalk exhibited limited fermentability due to inhibitory compounds.
Feedstock-specific fermentability tests are essential for successful hydrogen production.

Conclusions:

Barley straw, grains, and sugar beet extract are promising feedstocks for fermentative hydrogen production.
Corn stalk requires optimization of pretreatment methods to mitigate inhibition.
Fermentability assays are critical for selecting suitable biomass feedstocks.