Pasteurisation is a process to reduce the number of viable pathogenic organisms in a material to a level below that which would cause infection; it is most usually achieved by heating the material to a minimum temperature and holding at this temperature for a minimum time. In recent years legislation requiring pasteurisation has been introduced in many countries across the world to ensure that recycled organic materials such as sewage sludge and food waste are safe for use in agriculture and horticulture (e.g. in the UK the Animal By-Product Regulations or the Safe Sludge Matrix would apply).
Doosan Enpure's system has been developed specifically for sewage sludges and other biowastes undergoing anaerobic digestion. It operates with high thermal efficiency using low grade waste energy taken typically from an associated CHP plant. In this way if an existing digestion plant is to be upgraded to meet the requirements of changing legislation the pasteurisation stage can be installed without adversely affecting the existing energy balance. Alternatively a bespoke system can be integrated into a greenfield site digestion facility to ensure that the overall highest energy recovery is obtained, maximizing revenues through sale of energy and government green energy incentive schemes (e.g. FIT and RHI in the UK).