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.
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.
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.
Environmental investments in Vällingby Centrum
Svenska Bostäder have invested over three million Swedish kronor in an installation for geothermal energy and a recycling central. Thanks to the investment, Vällingby Centrum produces nowadays its own energy, which provides the shopping centre with 60 % of its need for heating and 90 % of its need for cooling.
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.
Sjöstadsverket tests new treatment methods
Hammarby Sjöstadsverket in Stockholm, Sweden, was built as part of the Hammarby Sjöstad initiative, with the aim of halving environmental impact by demonstrating new technology and innovative solutions. The facility is now continuing to serve as a development centre for new water treatment technology.
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.