Abstract
The effect of substrate (glucose) concentration on the stability and yield of a continuous fermentative process that produces hydrogen was studied. Four anaerobic fluidized bed reactors (AFBRs) were operated with a hydraulic retention time (HRT) from 1 to 8 h and an influent glucose concentration from 2 to 25 g L−1. The reactors were inoculated with thermally pre-treated anaerobic sludge and operated at a temperature of 30 °C with an influent pH around 5.5 and an effluent pH of about 3.5. The AFBRs with a HRT of 2 h and a feed strength of 2, 4, and 10 g L−1 showed satisfactory H2 production performance, but the reactor fed with 25 g L−1 of glucose did not. The highest hydrogen yield value was obtained in the reactor with a glucose concentration of 2 g L−1 when it was operated at a HRT of 2 h. The maximum hydrogen production rate value was achieved in the reactor with a HRT of 1 h and a feed strength of 10 g L−1. The AFBRs operated with glucose concentrations of 2 and 4 g L−1 produced greater amounts of acetic and butyric acids, while AFBRs with higher glucose concentrations produced a greater amount of solvents.





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- COD:
-
Chemical oxygen demand, mg L−1
- HRT:
-
Hydraulic retention time, h
- HPR:
-
Hydrogen production rate, L h−1 L−1
- HY:
-
Hydrogen yield, mol H2 mol−1 glucose
- HAc:
-
Acetic acid concentration, mg L−1
- HBu:
-
Butyric acid concentration, mg L−1
- HPr:
-
Propionic acid concentration, mg L−1
- EtOH:
-
Ethanol concentration, mg L−1
- MetOH:
-
Methanol concentration, mg L−1
- SMP:
-
Soluble microbial products, mg L−1
- TVFA:
-
Total volatile fatty acids, mg L−1
- VFA:
-
Volatile fatty acids, mg L−1
- AFBR:
-
Anaerobic fluidized bed reactor
- FID:
-
Flame ionization detector
- R2:
-
Reactor fed with glucose concentration of 2 g L−1
- R4:
-
Reactor fed with glucose concentration of 4 g L−1
- R10:
-
Reactor fed with glucose concentration of 10 g L−1
- R25:
-
Reactor fed with glucose concentration of 25 g L−1
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The authors gratefully acknowledge the financial support of FAPESP, CNPq, and CAPES.
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de Amorim, E.L.C., Sader, L.T. & Silva, E.L. Effect of Substrate Concentration on Dark Fermentation Hydrogen Production Using an Anaerobic Fluidized Bed Reactor. Appl Biochem Biotechnol 166, 1248–1263 (2012). https://doi.org/10.1007/s12010-011-9511-9
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DOI: https://doi.org/10.1007/s12010-011-9511-9


