TY - JOUR
T1 - Fermentative hydrogen production with a draft tube fluidized bed reactor containing silicone-gel-immobilized anaerobic sludge
AU - Lin, Chi Neng
AU - Wu, Shu Yii
AU - Chang, Jo Shu
N1 - Funding Information:
The authors gratefully acknowledge the financial support by Taiwan's National Science Council (NSC92-2214-E-035-002, NSC93-ET-7-006-001-ET, and NSC94-ET-7-006-004-ET), Feng Chia University (Grant no. FCU-89-J040), and Taiwan's Bureau of Energy (Grant no. 94-D0137-2).
PY - 2006/12
Y1 - 2006/12
N2 - A draft tube fluidized bed reactor (DTFBR) containing immobilized cell particles was designed to produce H2 continuously. A synthetic polymer (silicone gel; SC) was used as the primary material to immobilize acclimated anaerobic sludge for H2 production in DTFBR with a working volume of 8 L. The DTFBR system was operated at a hydraulic retention time (HRT) of 2.2-8.9 h and an influent sucrose concentration (Cs) of 5-40 g COD/l. The results show that in general decreasing HRT or increasing sucrose concentration led to a marked increase in the volumetric H2 production rate (vH2), but a gradual decrease in the H2 yield (YH2). The best vH2 (2.27 ± 0.13 l / h / l) occurred at Cs = 40 g COD/l and HRT = 2.2 h, whereas the highest YH2 (4.98 ± 0.18 mol H2/mol sucrose) was obtained at Cs = 40 g COD/l and HRT = 8.9 h. The correlation between the production rate and the organic loading rate (OLR) can be satisfactorily described by Monod-type models. There was no universal trend of the dependence between the H2 yield and OLR. The H2 content in the biogas was stably maintained at over 40%. The major soluble products were butyric acid and acetic acid, as they accounted for 62-73% and 16-22% of total soluble microbial products (SMPs), respectively. The H2-producing performance in the DTFBR system can be stably maintained and reproducible in long-term operations, while unstable operations can be quickly recovered via proper thermal treatment at 70-80 °C.
AB - A draft tube fluidized bed reactor (DTFBR) containing immobilized cell particles was designed to produce H2 continuously. A synthetic polymer (silicone gel; SC) was used as the primary material to immobilize acclimated anaerobic sludge for H2 production in DTFBR with a working volume of 8 L. The DTFBR system was operated at a hydraulic retention time (HRT) of 2.2-8.9 h and an influent sucrose concentration (Cs) of 5-40 g COD/l. The results show that in general decreasing HRT or increasing sucrose concentration led to a marked increase in the volumetric H2 production rate (vH2), but a gradual decrease in the H2 yield (YH2). The best vH2 (2.27 ± 0.13 l / h / l) occurred at Cs = 40 g COD/l and HRT = 2.2 h, whereas the highest YH2 (4.98 ± 0.18 mol H2/mol sucrose) was obtained at Cs = 40 g COD/l and HRT = 8.9 h. The correlation between the production rate and the organic loading rate (OLR) can be satisfactorily described by Monod-type models. There was no universal trend of the dependence between the H2 yield and OLR. The H2 content in the biogas was stably maintained at over 40%. The major soluble products were butyric acid and acetic acid, as they accounted for 62-73% and 16-22% of total soluble microbial products (SMPs), respectively. The H2-producing performance in the DTFBR system can be stably maintained and reproducible in long-term operations, while unstable operations can be quickly recovered via proper thermal treatment at 70-80 °C.
UR - http://www.scopus.com/inward/record.url?scp=33751100369&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33751100369&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2006.05.012
DO - 10.1016/j.ijhydene.2006.05.012
M3 - Article
AN - SCOPUS:33751100369
SN - 0360-3199
VL - 31
SP - 2200
EP - 2210
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 15
ER -
