Rapid formation of hydrogen-producing granules in an up-flow anaerobic sludge blanket reactor coupled with high-rate recirculation

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Application of an up-flow anaerobic sludge blanket (UASB) reactor to dark fermentative H-2 production greatly improves H-2 productivity due to the maintenance of high biomass concentration. However, a long start-up HRT and start-up period are required to develop the H-2-producing granules (HPGs) and to avoid washing out the suspended sludge at the start of the process. In the present work, a novel strategy to rapidly form HPGs was developed in UASB reactor. To induce highly active mass transfer in the UASB reactor, a high recirculation rate (15 times the influent) was adopted over 10 days, then recirculation was stopped. As the operation progressed, self-flocculation took place and HPGs developed after 90 h of operation. A stable production of H-2 was observed after 20 days of operation. The thickness of the HPGs layer in the sole UASB reactor increased progressively, and consequently the average HPG diameter and concentration were 1.86 mm (0.1-3.9 mm) and 52 g/L, respectively, after 60 days of operation. These findings seem to suggest that high-rate recirculation plays a crucial role in accelerating the formation of HPGs in such UASB reactors through high up-flow velocity, providing active mass transfer. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2013-07
Language
English
Article Type
Article
Keywords

UASB REACTOR; BIOHYDROGEN PRODUCTION; PERFORMANCE

Citation

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.38, no.22, pp.9097 - 9103

ISSN
0360-3199
DOI
10.1016/j.ijhydene.2013.05.059
URI
http://hdl.handle.net/10203/192671
Appears in Collection
CE-Journal Papers(저널논문)
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