Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 20, Pages 7789-7796Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.05.024
Keywords
Hemicelluloses; Biohydrogen; Mixed culture; Extreme thermophilic
Funding
- Ministry of Science and Technology of the Royal Thai Government
- Danish Innovation and Research Council [2104-06-0004]
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Hydrogen production from hemicellulose-rich wheat straw hydrolysate was investigated in continuously-stirred tank reactor (CSTR), up-flow anaerobic sludge bed (UASB) reactor, and anaerobic filter (AF) reactor. The CSTR was operated at an hydraulic retention time (HRT) of 3 days, and the UASB and AF reactors were operated at 1 day HRT, using mixed extreme thermophiles at 70 degrees C. The highest hydrogen production yield of 212.0 +/- 6.6 mL-H-2/g-sugars, corresponding to a hydrogen production rate of 821.4 +/- 25.5 mL-H-2/d L was achieved with the UASB reactor. Lowering the HRT to 2.5 days caused cell mass washout in the CSTR, while the UASB and AF reactors gave fluctuating and reducing hydrogen production at a 0.5-day HRT. The original rate and yield were recovered when the HRT was increased back to 1 day. These results demonstrate that reactor configuration is an important factor for enhancing and stabilizing H-2 production. (C) 2010 Elsevier Ltd. All rights reserved.
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