In this presentation real-life data of dioxin emissions will be showed and explained. I will introduce the benefits of long-term sampling of dioxin emissions and show measurement data from short-term and long-term measurements.
Specific dioxins, furans and other POPs (Persistent Organic Pollutants) cannot be measured in real time using an online monitoring equipment. The best way to measure these compounds is by continuous sampling method.
The biggest difference in short-term sampling (eight hours according to the EN-1948 standard) and long-term sampling (for example, two weeks) stays in the quality of the measurement data. Short-term sampling reflects the result of an approximately eight (8) hours of operation of the plant and is usually performed during the daytime following the normal working hours. Short-term sampling risks to fail in giving reliable measurement results as emissions are not monitored continuously (for example, not during the nighttime, weekends, exceptional plant conditions) resulting in unrepresentative sampling.
Long-term sampling expresses the average concentration value over the sampling period and is important part of improved process control to manage dioxin emissions. Continuous sampling of emissions covers the whole operation time of the plant and, therefore, representative sampling secures reliable measurement results. Continuous monitoring enables to achieve a real mass balance of what and how much a plant is emitting to the environment. Long-term sampling results in much lower variability of the results. The low variability of long-term measurements enables a plant operator to program maintenance on a basis of accurate and reliable data. In addition, the effect of the maintenance is clearly visible.