Electrochemical Gas Cleaning

This ph.d.-project investigates a new method for selectively removing hydrogen sulphide from biogas. The cleaning process is an electrochemically assisted scrubbing process where hydrogen sulphide is selectively oxidized to elemental sulphur. The oxidation agent is generated electrochemically in situ. The chemicals are reused and as such the only consumption is electricity.

Biogas is produced from anaerobic digestion of different biological feedstock, and will generally consist of 60 % methane (CH4) and 40 % carbon dioxide (CO2), with approximately 2000 PPM hydrogen sulphide (H2S) as the main impurity.

This ph.d.-project is part of the MeGa-StoRE project where a new upgrading technology of biogas is being investigated, i.e. catalytically converting the CO2 to CH4. This technology is proposed as an energy storage solution, as the H2 required for the conversion can be supplied by renewable energy driven electrolysis. For catalytically upgrading of biogas, the requirements for the desulphurization efficiency is higher than for other applications, and a new technology was sought.

This process have been found to remove H2S from approximately 2000 PPM down to <1 PPM in a single step, operating at ambient temperature and pressure. The MeGa-StoRE project will perform field tests at the Nature Energy Midtfyn biogas plant in the winter of 2018-2019.

Main supervisor:

Prof. Hans Nørgaard Hansen

Co- supervisors:
Prof. Per Møller
Assoc. Prof. Philip Fosbøl
Lars Pleth Nielsen


Sebastian Nis Bay Villadsen
Senior Project Manager
DTU Chemical Engineering


Philip Loldrup Fosbøl
Associate Professor
DTU Chemical Engineering
+45 45 25 28 68