Process Heating of Modern Digesters and Advanced Digestion Systems, an Overview of Technologies Available, Potential Pitfalls and Available Heat Sources

Harrison, D., and Brade, C., Monsal


The last 10 years has seen a growing investment in Advanced Digestion plants in the UK with 7 of the 10 water utility
companies of England and Wales now either operating Advanced Digestion plants or in the planning / feasibility stages for
such projects. Originally intended to increase pathogen reduction by digestion the 1st generation plants operated at high
temperatures to achieve time temperature pasteurisation. More recently advanced digestion plants have been required to
increased volatile solids conversion at high organic loadings in addition to pathogen reduction. The complexity of designing
the various elements of Advanced Digesters has led to a preference for low temperature biological advanced digestion
systems combined with anaerobic digesters. This paper looks at one of these elements that of heat transfer, for Advanced
Anaerobic Digestion (AAD) plants and highlights the advantages of biological systems over more complex high temperature
Advanced Digestion, AAD, Heating, Steam

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