In the reconstruction phase after 1987, according to the trend of times, two gas burners each were installed in the waste combustion chambers having an individual capacity of 9MW for the start-up and shut-down of the waste furnaces.

Based on that a combustion chamber temperature could be ensured of at least 900 C during the unstable start-up and shut-down phase. Thus, a better burnout of the flue gases could be safeguarded.

The pH-value is stabilized by adding lime slurry. Hydrochloric acid and hydrofluoric acid as well as dust together with heavy metals are separated in double-hollow conical water shields, where each of these filters covers the whole gas cross-section.

In order to prevent the loss of washing water and thus of Ca-ions from m scrubber 1 to scrubber 2, mist-eliminators are installed between the two washing towers.

It is worthwhile mentioning that the MWI Spittelau has been the first in Europe equipped with a SCR-plant behind a waste incineration installation with the longest operation period till now. Further, it is noteworthy that the dioxin emissions in the range of 0,02 to 0,06 ng TE/Nm3 are far below the limit value of 0,1 ng TE/Nm3 required by law.

On the part of the industrial and trade authorities the continuous measurement and registration of-following emission values were prescribed for the MWI Spittelau, where the MA22(Municipal Authority 22) has direct access to all operational and emission data of the plant (direct data link).

Further emission measurements at set intervals are carried out by the authorities throughout the year. Based on the considerable differences between the permitted and measured values, the potential reserves of the plant are evident.