Hydrogen production from continuous flow, microbial reverse-electrodialysis electrolysis cells treating fermentation wastewater

Valerie J. Watson, Marta Hatzell, Bruce E. Logan

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

A microbial reverse-electrodialysis electrolysis cell (MREC) was used to produce hydrogen gas from fermentation wastewater without the need for additional electrical energy. Increasing the number of cell pairs in the reverse electrodialysis stack from 5 to 10 doubled the maximum current produced from 60 A/m3 to 120 A/m3 using acetate. However, more rapid COD removal required a decrease in the anolyte hydraulic retention time (HRT) from 24 to 12 h to stabilize anode potentials. Hydrogen production using a fermentation wastewater (10 cell pairs, HRT = 8 h) reached 0.9 ± 0.1 L H2/Lreactor/d (1.1 ± 0.1 L H2/g-COD), with 58 ± 5% COD removal and a coulombic efficiency of 74 ± 5%. These results demonstrated that consistent rates of hydrogen gas production could be achieved using an MREC if effluent anolyte COD concentrations are sufficient to produce stable anode potentials.

Original languageEnglish (US)
Pages (from-to)51-56
Number of pages6
JournalBioresource technology
Volume195
DOIs
StatePublished - Aug 15 2015

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All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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