TY - JOUR
T1 - Rapid formation of hydrogen-producing granules in an up-flow anaerobic sludge blanket reactor coupled with high-rate recirculation
AU - Jung, Kyung Won
AU - Cho, Si Kyung
AU - Yun, Yeo Myeong
AU - Shin, Hang Sik
AU - Kim, Dong Hoon
PY - 2013/7/26
Y1 - 2013/7/26
N2 - Application of an up-flow anaerobic sludge blanket (UASB) reactor to dark fermentative H2 production greatly improves H2 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 H2 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.
AB - Application of an up-flow anaerobic sludge blanket (UASB) reactor to dark fermentative H2 production greatly improves H2 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 H2 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.
KW - H -producing granules
KW - High-rate recirculation
KW - reactor
KW - Up-flow anaerobic sludge blanket
UR - http://www.scopus.com/inward/record.url?scp=84879910362&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2013.05.059
DO - 10.1016/j.ijhydene.2013.05.059
M3 - Article
AN - SCOPUS:84879910362
SN - 0360-3199
VL - 38
SP - 9097
EP - 9103
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 22
ER -