Abstract
In composting, there is always a risk of pathogens and unwanted plant seeds being present. The risk of pathogen content varies with substrate and is the highest in sewage and excreta products. There are several functions regulating pathogen inactivation in composting, with the main effect deriving from the heat produced. Most pathogen inactivation starts at temperatures above 50°C, and it increases with increasing temperature. The compost conditions needed for reaching high temperatures are the available energy and oxygen. The temperature distribution within the compost varies depending on factors such as moisture content and external cooling from incoming air. In areas with lower temperatures, inactivation decreases and in some cases where the material is fresh, growth of pathogenic bacteria can occur. In a composting process, it is impossible to monitor all polluting pathogens and plant seeds, and therefore, the most appropriate management option is the validation of the process regarding its efficiency for pathogen inactivation. Thereafter, the sanitisation effect can be monitored via process parameters such as temperature, pH and product stability.
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Vinnerås, B., Agostini, F., Jönsson, H. (2010). Sanitation by Composting. In: Insam, H., Franke-Whittle, I., Goberna, M. (eds) Microbes at Work. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-04043-6_9
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