Abstract

Pre-fermentation of poorly biodegradable landfill leachate (BOD5/COD ratio of 0.32) was evaluated for enhanced current density (j), Coulombic efficiency (CE), Coulombic recovery (CR), and removal of organics (BOD5 and COD) in a microbial electrolysis cell (MEC). During fermentation, the complex organic matter in the leachate was transformed to simple volatile fatty acids, particularly succinate and acetate in batch tests, but mostly acetate in semi-continuous fermentation. Carbohydrate had the highest degree of fermentation, followed by protein and lipids. j, CE, CR, and BOD5 removal were much greater for an MEC fed with fermented leachate (23A/m3 or 16mA/m2, 68%, 17.3%, and 83%, respectively) compared to raw leachate (2.5A/m3 or 1.7mA/m2, 56%, 2.1%, and 5.6%, respectively). All differences support the value of pre-fermentation before an MEC for stabilization of BOD5 and enhanced electron recovery as current when treating a recalcitrant wastewater like landfill leachate.

Original languageEnglish (US)
Pages (from-to)151-158
Number of pages8
JournalBioresource Technology
Volume151
DOIs
StatePublished - Jan 2014

Keywords

  • Anode respiring bacteria
  • Coulombic efficiency
  • Current density
  • Microbial electrolysis cell
  • Pre-fermentation

ASJC Scopus subject areas

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

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