Paper Title:
Effect of Organic Loading Rate on Fermentative Hydrogen Production in CSTR
  Abstract

This study investigated the impact of five organic loading rates (OLRs) ranging from 16 kg COD/m3-d to 32 kg COD/m3-d on the performance of a continuous stirred tank reactor (CSTR) for biological hydrogen production, with molasses as substrate. Hydraulic Retention Time (HRT) was kept at 6 hours and the temperature 35°C. Oxidation-reduction potential (ORP) varied from -328 mV to -419 mV. The ethanol-type fermentation has been conducted during the process. A positive statistical correlation was observed between OLR and biogas yield; however, it became negative for the OLR of 32 kg COD/m3-d (Fig1). The system maintained the highest average biogas and hydrogen yield of 14.66 L/d and 5.17 L/d at OLR of 28 kg COD/m3-d. Compared with the first stage (16 kg COD/m3-d), ethanol and butyric concentration of the last stage (32 kg COD/m3-d) increased about 2.01 and 3.79 times, respectively; Acetic acid concentration surged around 200 mg/L; Prop ionic acid concentration dropped slightly; Valeric acid concentration, which took a small portion in the volatile fatty acid (VFA), kept low. When OLR was kept at 28 kg COD/m3-d, the average ethanol to acetic acid ratio is 3.90.Thus proved that the optimal OLR for hydrogen production under experimental condition is 28 kg COD/m3-d.

  Info
Periodical
Advanced Materials Research (Volumes 156-157)
Edited by
Jingtao Han, Zhengyi Jiang and Sihai Jiao
Pages
732-736
DOI
10.4028/www.scientific.net/AMR.156-157.732
Citation
S. Gao, B. Wang, L. L. Zhu, W. Han, H. Chen, Y. F. Li, "Effect of Organic Loading Rate on Fermentative Hydrogen Production in CSTR", Advanced Materials Research, Vols. 156-157, pp. 732-736, 2011
Online since
October 2010
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$32.00
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