![]() ![]() Thus, by optimising the available air pore volume, the oxygen supply to the microorganisms responsible for the decomposition processes and thus the process speed can be increased. ![]() Odour emissions occurring in the subsequent rotting process can be influenced advantageously as early as the preparation and mixing of the input materials. sufficient oxygen supply to the rotting material.targeted mixing of the source materials.upper limit of the 95% confidence interval.Īccording to the state of the art of composting (Lebensministerium, 2009), the possibilities of affecting the biological process through active rotting for the purpose of odour reduction are:.Two approaches can therefore be considered when setting emission levels: When comparing different laboratories, larger scatter ranges are to be expected (factor 4), so that in this case the confidence limits may differ by a factor of 2. The limits of the 95 % confidence interval differ by a factor of 3 for repeated measurements by the same laboratory, so that with a ‘true’ mean value of, for example, 300 GE m-3, even 200 or 450 GE m-3 would still be acceptable measurement results. Response fluctuations of three dilution levels are generally to be expected in a single measurement (12 measurement series, three runs with four test persons) (VDI, 200218). The determination of the odour threshold with the help of test persons (DIN EN 13725 ‘Air quality – Determination of odour concentration using dynamic olfactometry’, 2003) is an objective measurement method (ISO 5492, Sensory Analysis – Vocabulary). “Therefore, it is necessary to first interpret and evaluate olfactometric measurement data.” “According to the state of the Art of Composting, guideline values for the limitation of odour emissions may only be set in compliance with the limits of olfactometric measurement technology,” says Melanie Waltner of the Austrian Compost & Biogas Association. In Austria it is regulated in the State of the Art of Composting (Lebensministerium, 2009). The implementation of measurements is regulated in different ways in different countries. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |