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Enhanced photo-fermentative hydrogen production by synergistic effects of formed biofilm and added L-cysteine

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  • Wen, Han-Quan
  • Xing, De-Feng
  • Xie, Guo-Jun
  • Yin, Tian-Ming
  • Ren, Nan-Qi
  • Liu, Bing-Feng

Abstract

In this work, the synergistic effects of L-cysteine and biofilm on the performance of reactor were investigated in the photo-fermentative biofilm reactor. Both L-cysteine and biofilm could enhance the performance of reactor for producing hydrogen. The optimal L-cysteine concentrations in the biofilm reactor (BR) and control reactor (CR, reactor with no biofilm) were 0.5 g/L and 0.75 g/L, respectively. In addition, the maximum cumulative hydrogen volume (3500 ± 170 mL/L), substrate conversion efficiency (79.4 ± 4.0%) and hydrogen yield 867 ± 43 mL/g (acetate) were obtained in the BR at L-cysteine concentration of 0.5 g/L. It is intriguing that extracellular DNA (eDNA) occupied 50% of EPS, which could play a key role in hydrogen production. Biofilm could decrease EPS concentration of cells in the BR at each L-cysteine concentration to divert more energy into hydrogen. The moderate L-cysteine concentration could improve bacterial growth and regulate the EPS to promote the biofilm formation and enhance hydrogen production. Thus, the regulation of L-cysteine concentration will be a practical method to enhance hydrogen production by the biofilm reactor.

Suggested Citation

  • Wen, Han-Quan & Xing, De-Feng & Xie, Guo-Jun & Yin, Tian-Ming & Ren, Nan-Qi & Liu, Bing-Feng, 2019. "Enhanced photo-fermentative hydrogen production by synergistic effects of formed biofilm and added L-cysteine," Renewable Energy, Elsevier, vol. 139(C), pages 643-650.
    • Handle: RePEc:eee:renene:v:139:y:2019:i:c:p:643-650
    DOI: 10.1016/j.renene.2019.02.127
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    1. Steven Chu & Arun Majumdar, 2012. "Opportunities and challenges for a sustainable energy future," Nature, Nature, vol. 488(7411), pages 294-303, August.
    2. Valdez-Vazquez, Idania & Poggi-Varaldo, Héctor M., 2009. "Hydrogen production by fermentative consortia," Renewable and Sustainable Energy Reviews, Elsevier, vol. 13(5), pages 1000-1013, June.
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    1. Li, Jiangbo & Wang, Kai & Wang, Shaojie & Su, Haijia, 2023. "Spatially-ordered layer-by-layer biofilms of a two-species microbial consortium promote hydrogen production," Renewable Energy, Elsevier, vol. 215(C).

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