Artificial wetlands in Trosa
Since 2003 the waste water from the town of Trosa (about 4500 citizens) has been treated in artificial wetlands, after the basic treatment in the sewage plant. Thanks to the wetlands the Trosa river and the town bay have been spared from eutrophicating substances (plant nutrients) as well as contagious substances (pathogenes). Besides the value of purifying the water, the wetlands are a popular recreation area. The wetlands are used for education and many study visits are made here. Vagnhärad, the neighbouring town with about 4500 citizens, has a similar area of artificial wetlands since 2001.
Waste incineration at Högdalenverket
Högdalenverket, which is one of Europe’s most modern installations for energy extracted from waste, produces electricity and heat from Stockholm’s combustible household waste and industry waste. Högdalenverket is an important component in the district heating network of southern Stockholm.
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.
The Hammarby Sjöstad Ecocycle
The goal for Hammarby Sjöstad in Stockholm, Sweden, was to halve the overall environmental impact compared with if the area had been built in the early 1990s. The goal was not fully attained. But thanks to the ambitious target and integrated planning, this lakeside town has set an international example.
Eco-cycle solutions in Norrtälje
Thanks to a large-scale installation of composting and a hundreds of separate sewers, the municipality of Norrtälje has managed to reduce a leakage of nutrients with five tons to the Baltic Sea. These actions have raised the property owner’s interest for Eco-cycle solutions and the municipality has gained a valuable knowledge in eco-cycle adapted water and sewage sytems.