Traditionally, the monitoring of PCDD/Fs is achieved by taking 1–3 short-term samples per year (each of 6 hours).
However, over the past 10 years it was discovered that especially during start-up and shut-down periods of (state of the art) incinerators the dioxin emissions in the flue-gas can increase compared to normal operation up to factors of 1000 in raw gas and after bag-filters.
Another study quantified that around 60 % of the yearly dioxin emissions of a plant are produced and emitted during one start-up. These findings revealed and demonstrated that dioxin and POPs emissions of incinerators cannot be reliably monitored by manual short term sampling since such spot measurements represent only 1–2 ‰ of the yearly operating time of the plants during normal operating conditions.
The AMESA system, approved in 1997 by TÜV Rheinland (Germany), in 2005 by MCerts (UK) and in 2006 by ETV EPA (United States), is designed for the long-term sampling of dioxins (PCDD), furans (PCDF) and other Persistant Organic Pollutants (POPs).
By permanent sampling over a period of up to 4 weeks, AMESA ensures continuous documentation of dioxins/furans emission for each single sample, thus ensuring that fluctuations in plant operation and in the composition of the fuel are well recorded.
The Long Term Dioxin Sampler AMESA can be used, for example, in refuse incinerators, hazardous material incinerators, medical waste burners, cement kilns etc.
The sampling method is also suitable for other sampling applications like e.g. heavy metals, mercury or fine dust (PM10, PM2,5).