Cleaner air in Stockholm with sewage sludge
Two sewage treatment works in Stockholm are producing biogas from sewage sludge. After having purified the gas, it can be used for both heating and vehicle fuel and in addition creates no net emissions of carbon dioxide. Consequently, the treatment works have reduced their amount of emissions and become energy suppliers. Therefore, sewage sludge is no longer an environmental problem, but an important energy resource.
Käppala – an efficient water treatment plant
Käppalaverket is one of the world’s most efficient water treatment installations, with the entire northern Stockholm as a catchment area. Apart from the fact that the installation treats water for over 500 000 people, it also produces biogas, running 100 busses.
Underground waste management
Thanks to a stationary pneumatic refuse collection system, the garbage doesn’t need to be collected by trucks anymore. Instead, the garbage is transported by air through pipes, where it is compacted in sealed containers. Using a vacuum system instead of an old-fashioned refuse room or waste container does away with problems with unpleasant odours, and nobody needs to come into contact with waste bags or containers.