Ecological energy from waste sludge

Photo: Christian Houdek

As part of the waste sludge treatment plant in Vienna, there is an ecological power plant that produces electricity from wastewater. The electricity obtained in this way reduces carbon dioxide emissions by 40,000 tons per year.

As of this year, the plant produces all the energy necessary for wastewater treatment, as well as excess ecological electricity and heat. With the new ecological power plant, the wastewater treatment plant has turned from one of the largest energy consumers into an energy producer, according to Eurocomm.

Sludge treatment produces up to 78 gigawatt hours of electricity per year, corresponding to the total electricity consumption of more than 30,000 Viennese households. 80 percent of this energy and almost 40 percent of thermal energy are necessary for wastewater treatment. The rest of the ecological energy is forwarded to the Vienna supply system.

As they explain, two million cubic meters of waste sludge remain annually, which is heated to 38 degrees in anaerobic digesters in which microorganisms decompose organic compounds from it. After 25 days, as long as the process lasts, a gas consisting of two thirds of methane is formed. In that way, 20 million cubic meters of gas are produced every year, which is used as fuel for gas engines in thermal power plants. This not only generates mechanical energy that is converted into electricity, but also thermal energy that is used for heating and hot water.

The city of Vienna has set a goal to become carbon neutral by 2040, and the processing of sewage sludge significantly helps.

In the next few years, as many as 65 municipalities in Serbia could permanently solve the problem of wastewater. Minister of Construction, Transport and Infrastructure Tomislav Momirović and Director of the China Road and Bridge Corporation in Serbia Zhang Xiaoyuen signed commercial contracts on the design and execution of works on the construction of communal infrastructure and infrastructure for disposal of communal solid waste in Serbia.

The plan envisages the design and execution of construction works wastewater treatment plants, sewerage networks and pumping stations. Technology that includes and includes treatment will be used for wastewater treatment sludge, which permanently solves this problem, which greatly affects environmental protection.

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Source: Energetski portal Srbije by www.energetskiportal.rs.

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