Validation measurements to determine the measurement uncertainty in odour emission measurements according to DIN EN 13725:2022
In DIN EN 13725:2003 no explicit procedure for determining the measurement uncertainty in odour emission measurements has been specified until now. However, according to the amended TA Luft a statement on the measurement uncertainty is required. With the introduction of EN 13725:2022, a new procedure for determining the measurement uncertainty has now been defined. According to this, the measurement uncertainty is to be determined with a combination of a duplicate determination of real environmental samples with two identical measuring devices according to DIN EN ISO 20988:2007 and the determination of the n-butanol odour threshold of the respective test group.
To validate the method, the VDI working group "Determination of odour concentration with dynamic olfactometry", which is part of the VDI/DIN Commission on Air Quality Control (KRdL), has taken the initiative and initiated the project "Validation measurements to determine the measurement uncertainty in odour emission measurements". As supervising authority, the North Rhine-Westphalian State Office for Nature, Environment and Consumer Protection (LANUV) is also involved in the project, as is the VDI. Boris Zimmermann and Frank Müller from our Gelsenkirchen branch office are part of the working group as representatives of Müller-BBM Industry Solutions.
Within the framework of the above-mentioned project, preliminary tests took place on 14th December 2022 at the sewage sludge drying facility of the Bottrop sewage treatment plant (Emschergenossenschaft Lippeverband) with the participation of our Gelsenkirchen branch and another accredited measuring facility notified in accordance with § 29b of the Federal Immission Control Act (BImSchG).
On 11th January 2023, the practical odour measurements were carried out at the above-mentioned plant. In addition to the colleagues from our branch in North Rhine-Westphalia, eleven other accredited measuring facilities notified in accordance with § 29b of the Federal Immission Control Act (BImSchG) participated in the validation measurements, during which a total of 240 odour samples were taken.
The results of the measurements are currently being evaluated. Once the final results are available, we will report on this at a suitable place.
The measurements were funded by the VDI/DIN Commission on Air Quality Control (KRdL), FKZ: 372201I001.
Within the framework of odour emission measurements, the new and stricter specifications are to be applied.