Siemens is to support the city of Vienna in optimising its main sewage plant in terms of energy. For this purpose, Siemens is supplying the control, measuring, analytical and power distribution systems, as well as the low and medium-voltage switchgear.
The order is worth around 24 million euros and is part of “E_OS 2020” (Energy_Optimization Sludge Treatment), the largest environmental project ever undertaken by the city of Vienna. As from 2020, the main sewage plant will use sewage gas to generate autonomously all the energy required for the waste-water treatment. For the sewage treatment itself, a particularly efficient method is used with reduced water and double the solid content, which considerably reduces the energy consumed during anaerobic digestion and gas generation. The main sewage plant, currently among the largest energy consumers in the community, should generate an output of 78 GWh of electricity and 82 GWh of thermal energy. In total this method should save about 40 000 metric tons of CO² per year.
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