Production of hydrogen from domestic wastewater in a pilot-scale microbial electrolysis cell (2013)

Author(s): Heidrich ES, Dolfing J, Scott K, Edwards SR, Jones C, Curtis TP

    Abstract: Addressing the need to recover energy from the treatment of domestic wastewater, a 120-L microbial electrolysis cell was operated on site in Northern England, using raw domestic wastewater to produce virtually pure hydrogen gas (100 ± 6.4 %) for a period of over 3 months. The volumetric loading rate was 0.14 kg of chemical oxygen demand (COD) per cubic metre per day, just below the typical loading rates for activated sludge of 0.2–2 kg COD m−3 day−1, at an energetic cost of 2.3 kJ/g COD, which is below the values for activated sludge 2.5–7.2 kJ/g COD. The reactor produced an equivalent of 0.015 L H2 L−1 day−1, and recovered around 70 % of the electrical energy input with a coulombic efficiency of 55 %. Although the reactor did not reach the breakeven point of 100 % electrical energy recovery and COD removal was limited, improved hydrogen capture and reactor design could increase the performance levels substantially. Importantly, for the first time, a ‘proof of concept’ has been made, showing that this technology is capable of energy capture as hydrogen gas from low strength domestic wastewaters at ambient temperatures.

      • Date: 01-08-2013
      • Journal: Applied Microbiology and Biotechnology
      • Volume: 97
      • Issue: 15
      • Pages: 6979-6989
      • Publisher: Springer
      • Publication type: Article
      • Bibliographic status: Published

      Professor Thomas Curtis
      Professor of Environmental Engineering

      Dr Jan Dolfing
      Senior Researcher in Environmental Engineering