Innovative electroscrubbing process for biogas impurity removal

A new biogas cleaning technology was tested at the Hashøj Biogas facility in Denmark. The new technology is a PtX process which consumes only electricity to clean the biogas. The process was capable of removing a wide variety of sulfur components, most notably hydrogen sulfide and mercaptans. Additionally, a variety of volatile organic compounds (VOC) such as terpenes and benzenes were removed. Overall, the process was found to remove 99.96 % of sulfur species in the biogas alongside 94.77 % of the measured VOC. With a polishing step the biogas will be ready for use either as a substitute for natural gas, or for PtX upgrading into e.g. methanol. The purity of the hydrogen produced by the setup was found to be 98.75 %. With the implementation of a small carbon filter, it could be possible to utilize the hydrogen in either fuel cells or for gas-to-liquid purposes.