By 2020 at least 70% of the city’s organic waste will be collected and turned into biogas. To make it accessible to as many residents as possible, the city of Stockholm needs to introduce more technical and automatic solutions to boost the present waste handling systems. In the “Green Bag” project, organic waste is put into a special green bag and then dropped into the same container or garbage chute as bags containing non-organic household waste. When the waste arrives at the automatic sorting plant, the green bags are optically separated from the rest of the garbage by the optical sorting system cameras, and the contents can then be turned into biogas and biological compost. The non-organic waste is turned into heat and electricity at the nearby Fortum CHP plant.
Some interesting facts about biogas from organic waste:
- A biogas-powered car can run for about 75 kilometers on 1000 banana peels.
- 1000 kg of food waste can supply biogas equivalent to 100 liters of gasoline.
- Using biogas instead of fossile fuels, carbon dioxide emissions can be reduced by about 73%.