Dimensioning of bioscrubber/biofilter-combinations for odour treatment at compost facilities
Composting of organic waste has been developed rapidly in Germany in the last years. While Fricke et al. (1992) counted 88 running or planned compost facilities in 1991, the number increased up to about 550 in 1998 with a total capacity of 6.5 Mio t/a of biowaste (Wiemer and Kern, 1998). So, composting is a wide spread, established process in waste management, producing an important product for farming and horticulture.
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.