In order to minimize emission of odour, larger compost plants usually are run in halls. The exhaust gas is led to an odour treatment plant, which in most cases consists of a humidifier and an open single-level biofilter. Those plants very often are not sufficient to avoid odour nuisance in the neighbourhood, which leads to complaints or even legal consequences.
In a research project supported by the German Federal Ministry of Education and Research (BMBF; see Acknowledgements), the combination of bioscrubbing and biofiltration was developed further in order to achieve an efficient and economical odour treatment system. In this paper, dimensioning bases for treatment of compost odours as well as calculation examples for industrial scale plants for bioscrubbing and biofiltration are given.