Käppalaverket, Wastewater treatment facility in Lidingö Municipality, Sweden
Käppalaverket is a wastewater treatment facility in Lidingö Municipality that processes sewage from eleven municipalities across Greater Stockholm. The plant uses underground systems built within solid rock and generates biogas that powers buses in the region.
The facility opened in 1969 after construction began in 1958 under the management of Käppalaförbundet. This project was built to meet the increasing demands of Stockholm's rapidly growing metropolitan area.
The tall chimney of Käppalaverket has become a recognizable landmark in the Lidingö landscape that residents and visitors easily spot. This structure shows how infrastructure can blend into the natural surroundings while serving the wider region.
The facility is built into solid rock and has significant underground sections that may be visible during tours or site visits. Getting there requires planning since it is located in a more remote area of Lidingö with limited public transport options.
The facility pumps incoming wastewater up 20 meters (65 feet) to reach the screening hall where sand is separated before biological treatment and filtration occurs. This elevation change is a key part of the process and allows gravity to assist later stages.
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