The City of Calgary (the City) recently commissioned a project to upgrade an existing cogeneration facility to maximize onsite electrical power generation and waste heat recovery using digester gas as the principal fuel source at the Bonnybrook Wastewater Treatment Plant (BBWWTP). The purpose of this system is better utilization of digester gas for generation of electricity and heat. The power generation and heating (PGH) facility upgrade replaced four obsolete combined heat and power (CHP) that were installed in 1984. A significant component of this project is the digester gas conditioning equipment. Digester gas typically requires some form of pre-treatment prior to cogeneration to remove siloxanes and hydrogen sulphides (H 2 S). Two new processes to North America were pioneered for the removal of H 2 S using an all biological scrubbing system and a molecular sponge siloxane removal system. The purpose of the systems is to reduce the corrosive and abrasive effects of digester gas used for generation of electricity and heat. This paper presents the results of the full scale implementation of these two novel digester gas conditioning systems including process design considerations, performance data, and recommendations for future installations.
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