Barcelona is exploring ways of running the city’s buses on sewage sludge-derived biomethane.
Bosses of the city’s transport system are looking at transforming sewage sludge left over from wastewater treatment into biomethane to reduce greenhouse gas emissions.
EU funding through the Nimbus Project is being used to try and create greener public transport. According to public transport operator TMB, 70% of its fleet ran on diesel fuel in 2010. By 2020, 75% of its buses were hybrid or running on less polluting energy.
Biomethane is created by gathering sewage sludge from wastewater treatment facilities. The biogas created is made up of methane and CO2. From March the CO2 will be removed, leaving biomethane, which can be stored under high pressure to be used as fuel for buses.
Currently, just one bus is being tested, but there are plans to have 46 methane-fuelled buses on the streets by 2024.