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The plant

The thermal waste utilisation plant of Zwentendorf/Dürnrohr essential consists of a furnace, a waste heat boiler for energy generation and a three-stage flue gas cleaning system.
> Incineration takes place in the furnace: here the combustible components of the waste are burned to flue gas, whereas the non-combustible ones are turned to ash and slag.
> The flue gas gives off its heat to the water circulating in the boiler walls. The result is steam which is used to drive the electricity generators and to heat the district heating system.
> The gas then passes through a sophisticated flue gas cleaning system which consists of a dry, wet and catalytic stage each to clean the gas and extract the harmful substances. Before the cleaned gas escapes into the air through the smokestack, it is examined for its quality and contents in a whole array of testing instruments.

The boiler ash and the rock-like slag that remain from incineration can be easily dumped in a landfill or may even be used for road construction.

The filter cake produced by the flue gas cleaning system contains all pollutants from the garbage in highly concentrated form. It is deposited in special underground dumps (ancient salt domes below groundwater levels) outside Austria. Many of the substances in this cake, such as cadmium, lead or fluorine, may well be recovered in the future because they are valuable raw materials.

Another by-product is gypsum, which is sought after by the construction industry.

Benchmark data of the thermal waste utilisation plant at Zwentendorf/Dürnrohr.
 
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