Lookup NU author(s): Dr Elizabeth Heidrich,
Dr Jan Dolfing,
Professor Keith Scott,
Emeritus Professor Colin Jones,
Professor Thomas Curtis
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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.
Author(s): Heidrich ES, Dolfing J, Scott K, Edwards SR, Jones C, Curtis TP
Publication type: Article
Publication status: Published
Journal: Applied Microbiology and Biotechnology
Print publication date: 01/08/2013
ISSN (print): 0175-7598
ISSN (electronic): 1432-0614
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