The Clearwater Cogeneration Wastewater Treatment Plant (CWWTP) in Corona, Calif., is using a Sernagiotto™ directly heated biosolids dryer by Siemens Water Technologies to process 110 wet tons per calendar day (9167 pounds per hour) of municipal biosolids, with a dry solids content
of 16 percent. Using a dual fuel source of natural gas and digester gas, the energy efficient biosolids dryer produces an end product that complies with the USEPA 503 Part 40 rule for heat dried Class A biosolids. The innovative design of this drying facility places the City of Corona in
a win-win position because the drying facility is integrated with the city's first power-plant (a 31 Mega Watt combined-cycle cogeneration facility) and the existing wastewater treatment plant. In addition to generating more than enough electricity to operate the complete facility, the
cogeneration facility provides 500°F waste heat to the biosolids dryer for the preheating of the dryer's combustion air, and supplies the low grade heat necessary to promote biological growth in the CWWTP's digesters. This paper/presentation discusses the innovative design
of the city's state-of-the-art biosolids drying facility and the combined-cycle cogeneration facility.
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