Main waste water treatment plant in Vienna becomes energy-slef-sufficient

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ebswien hauptkläranlage Ges.m.b.H.

Vienna, Austria

The main wastewater treatment plant in Vienna with its 165 employees is not only responsible for processing wastewater of all Viennese households but at the same time it adopts a number of renewable energy technologies to minimise the use of resources therefore necessary and become energy-self-sufficient until 2020. By combining several environmental techniques (photovoltaic energy, hydropower, solar thermal energy, wind power, use of sewage treatment gases) this objective represents a very innovative approach when it comes to wastewater management.

A turbine installed between the plant drainage and the mouth of the river, which is using the energy of the treated wastewater, provides approximately 1.5 GWh of electricity annually. In addition, solar thermal and photovoltaic installations were built on the grounds of the wastewater treatment plant and a small wind power plant ministers the electricity supply of the entire exterior lighting.

Until 2020, the wastewater treatment plant aims to cover its entire energy consumption independently. This is partly achieved by the new construction of the sewage sludge treatment plant. An integrated block heat and power station is using the sewage gas to generate 78 GWh of electricity und 82 GWh heat output from approximately 20 million m³ of methane annually. Apart from the renewable energy the energy consumption is reduced significantly by process optimisation and infrastructural measures (energy saving bulbs, heating technology).Due to the high in-house production and the low energy consumption these measures produce a surplus of approximately 15 GWh of electricity and 42 GWh heat output annually.

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ebswien hauptkläranlage Ges.m.b.H.

created in march 2012