Evaluation of sanitation measures in Tessenderlo on the basis of the IFDM model of SCK/CEN (Dutch)

Based on extensive stack discharge sampling a number of sanitation measures to reduce SO₂, ethylene and chlorinated hydrocarbons emission levels are discussed. Before planning permission for capacity extension was granted, the proposed sanitation measures had to be evaluated. The evaluation described here is based on the statistical diffusion theory for a continuous fixed source as developed by Taylor, Gifford, Hay and Pasquill. This IFDM model is of the biGaussian type and only takes normal discharge and dispersion conditions into account. As a result, due to extreme metereological conditions, discharge peaks may still occur for example as a result of down wash at high wind speeds. The model used was checked against the discharge data collected earlier. The positive results gained, increase the expected reliability of the model's evaluation of the sanitation measures proposed. In order to identify and combat possible discharge problems after production capacity had been increased, two fixed registration points will remain operative in the Tessenderloo (Belgium) area.