The pilot project "BioCNG for cities", carried out together with the Circular Economy Institute, Brno municipal watersystem, 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.
MEGA has installed a biomethane separation unit - BioCNG in a biogas plant of ZEMSPOL group, which operates two biogas plants working on the principle of wet fermentation and two-stage anaerobic fermentation. After analysis and laboratory tests, ZEMSPOL willingly provided facilities for the installation of the BioCNG pilot unit for a biomethane production volume of 6,3 Nm3/h at a methane content of 60 % by volume in the biogas input.
Operation parameters were continuously monitored. The BioCNG production unit was in continuous operation mode from spring 2015 to spring 2018, with the methane concentration in the product gas being higher than 95 vol. %. The operation was terminated according to the contractual conditions in July 2018 after incident-free continuous operation.
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