Ulla Hamilton, Environmental City Commissioner of Stockholm
The litter bins can easily be emptied twenty times a day if necessary instead of the current two times. In the future, people living in the area are also able to connect to the system.
Owner: The City of Stockholm
Six self-emptying litterbins are installed along the park Mariatorget in central Stockholm, Sweden. The litterbins have a level sensor that senses when they are full.
A valve opens underneath and the litter is transported in an underground pipe net and on to a storage container in a small waste collection station, buried under the grass in the park.
Since July 2013 Envac is testing a prototype on Mariatorget, a litterbin with a self-emptying ashtray integrated in the lid of the bin. The cigarette butts are stored in a thin, separate pipe beneath the ashtray. Every time the litterbins are emptied, the ashtrays are emptied as well.
The storage container is emptied every 14 days and lifted to the ground level by a hydraulic lift table. A truck transports the container to the incinerator located in Högdalen in southern Stockholm, where the waste is converted to energy and electricity. The collection station has been configured to enable future connection to additional bins, as well as to the buildings around Mariatorget.