The pilot project "BioCNG for cities", carried out together with the Circular Economy Institute, Brno municipal water system, and MemBrain, uses gas generated by wastewater treatment as a fuel for public transport. The project was awarded by Smart City Innovation institute.
The BioCNG BU-12 unit was connected to sludge gas in the BVK municipal wastewater treatment plant Modřice. The produced biomethane was refuelled into the DP Brno bus. 36 fillings were made with a total consumption of 1660 kg. The BioCNG unit ran 1068 hours without a single unplanned outage.
The transition from agricultural biogas to sludge gas passed off without any problems. On the contrary, the methane concentration was higher in the sludge gas, and the undesirable oxygen and nitrogen content was very low – therefore the biomethane concentration in the product was high.