Codigestion of FOG & HSW with Biosolids in North America – Design and Operational Practices and Performance

A significant number of successful high strength waste and municipal sludge codigestion projects have been implemented in recent years in North America. This paper highlights three case studies of facilities of various sizes and codigestion feedstocks, located in Des Moines, Iowa, Johnson County, Kansas, and Gloversville-Johnstown, New York. These facilities have various configurations and have faced individual challenges during their codigestion history, but have continued improving and expanding their codigestion facilities and program. This allowed them to keep receiving the significant benefits associated with codigestion of high strength wastes, including operational savings from on site generation of green electric power and heat and the revenue associated with accepting the high-strength wastes. The information in this paper is expected to be useful to facilities considering, implementing, or optimizing the operation of codigestion facilities.