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Enhancement of phototrophic hydrogen production by Rhodobacter sphaeroides ZX-5 using fed-batch operation based on ORP level

Li, Xu ; Dai, Zhen - Zhen ; Wang, Yong - Hong ; Zhang, Si - Liang

International Journal of Hydrogen Energy, Oct, 2011, Vol.36(20), p.12794(9) [Periódico revisado por pares]

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  • Título:
    Enhancement of phototrophic hydrogen production by Rhodobacter sphaeroides ZX-5 using fed-batch operation based on ORP level
  • Autor: Li, Xu ; Dai, Zhen - Zhen ; Wang, Yong - Hong ; Zhang, Si - Liang
  • Assuntos: Malic Acid
  • É parte de: International Journal of Hydrogen Energy, Oct, 2011, Vol.36(20), p.12794(9)
  • Descrição: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ijhydene.2011.07.070 Byline: Xu Li, Zhen-Zhen Dai, Yong-Hong Wang, Si-Liang Zhang Abstract: In this study, a new outer-cycle flat-panel photobioreactor was designed for an anaerobic, photo-fermentation process by Rhodobacter sphaeroides ZX-5. In order to obtain the high hydrogen yield, photo-hydrogen production by fed-batch culture with on-line oxidation-reduction potential (ORP) feedback control was investigated. Meanwhile, the effects of feeding malic acid concentration and pH adjustment on the growth and hydrogen production of R. sphaeroides ZX-5 were studied. In the entire fed-batch culture, biomass (i.e., OD.sub.660) rapidly increased up to 1.79 within 18 h, and then OD.sub.660 value stayed constant within a range of 1.85-2.18 until the end of the photo-fermentation. The cumulative hydrogen volumes in each phase of fed-batch process were 2339, 1439, 1328, and 510 ml H.sub.2/l-culture, respectively. Throughout the entire repeated fed-batch photo-fermentation, the maximum substrate conversion efficiency of 73.03% was observed in the first fed-batch process, obviously higher than that obtained from batch culture process (59.81%). In addition, compared to the batch culture, a much higher maximum hydrogen production rate (102.33 ml H.sub.2/l h) was achieved during fed-batch culture. The results demonstrated that photo-hydrogen production using fed-batch operation based on ORP feedback control is a favorable choice of sustainable and feasible strategy to improve phototrophic hydrogen production efficiency. Author Affiliation: State Key Laboratory of Bioreactor Engineering, P.O. Box 329#, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China Article History: Received 5 January 2011; Revised 7 July 2011; Accepted 16 July 2011
  • Idioma: English

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