Hydrothermal hydrolysis of starch with CO2 and detoxification of the hydrolysates with activated carbon for bio-hydrogen fermentation

Hydrothermal hydrolysis of starch with CO2 and detoxification of the hydrolysates with activated carbon for bio-hydrogen fermentation

The imminent use of hydrogen as an energy vector establishes the need for sustainable production technologies based on renewable resources. Starch is an abundant renewable resource suitable for bio-hydrogen generation. It was hypothesised that starch hydrolysates from a large (250 mL) hydrothermal r...

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Bibliographic Details
Published in:International journal of hydrogen energy Vol. 37; no. 8; pp. 6545 - 6553
Main Authors: Orozco, R.L., Redwood, M.D., Leeke, G.A., Bahari, A., Santos, R.C.D., Macaskie, L.E.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 01-04-2012
Elsevier
Subjects:
Activated carbon
Alternative fuels. Production and utilization
Applied sciences
Biohydrogen
Carbon dioxide
Detoxification
Energy
Exact sciences and technology
Fermentation
Fuels
Hot compressed water
Hydrogen
Hydrolysates
Hydrothermal hydrolysis
Inhibitors
Reactors
Renewable resources
Starch
Starches
Hydrothermal hydrolysis
Biohydrogen
Starch
Hot compressed water
Detoxification
Hydrogen
Carbon dioxide
Glucose
Fermentation
Hydrolysis
Renewable energy
Activated carbon
Energy carrier
Inhibitor
Yield
Hydrogen production
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Summary:The imminent use of hydrogen as an energy vector establishes the need for sustainable production technologies based on renewable resources. Starch is an abundant renewable resource suitable for bio-hydrogen generation. It was hypothesised that starch hydrolysates from a large (250 mL) hydrothermal reactor could support bioH2 fermentation without inhibition by toxic byproducts. Starch was hydrolysed at high concentrations (40–200 g L−1) in hot compressed water (HCW) with CO2 at 30 bar in a 250 mL reactor, the largest so far for polysaccharide hydrolysis, at 180–235 °C, 15 min. Hydrolysates were detoxified with activated carbon (AC) and tested in biohydrogen fermentations. The maximum yield of glucose was 548 g kg starch−1 carbon at 200 °C. 5-hydroxymethyl furfural, the main fermentation inhibitor, was removed by AC to support 70% more hydrogen production than the untreated hydrolysates. The potential utilization of starch hydrolysates from HCW treatment for upscaled fermentations is promising. ► Starch was hydrolysed in hot compressed water supplemented with CO2. ► CO2 enhanced sugar generation from starch but also increased levels of toxic 5-HMF. ► Activated carbon removed 5-HMF from hydrolysates without affecting sugars. ► Detoxified hydrolysates made more H2 in fermentation with Escherichia coli HD701. ► Study of the larger, scalable reactor moves towards practical hydrolysis in HCW/CO2.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2012.01.047