AC25 Anaerobic Digestion of Organics: Industry Drivers Overview of Two Case Studies for CHP and RNG

CWEA Members: $35.00
Non-Members $45.00
CWEA Contact Hours: 1.0 contact hours towards CWEA Certifications: ECI 

This presentation will discuss the diversion of organics, such as food waste and the co-digestion of these wastes with anaerobic digestion which generated biogas, a beneficial byproduct. Doing so allows reduction in landfill volumes and stabilization of the waste suitable for land application. The stabilization process, when accomplished with anaerobic digestion, generates biogas, a beneficial byproduct.

The presentation will include an overview of industry trends, including regional trends in State of California for organics diversion requirements. Other industry drivers that will be covered will include greenhouse gas emissions reductions, state and federal financial incentives, and drivers for renewable energy production.

When organic waste is diverted to a wastewater treatment facility, the organics can be co-mingled with municipally generated sludge in anaerobic digestion (i.e., co-digestion). This allows for existing infrastructure to be utilized for both wastewater treatment and landfill diversion while generating a biosolids product and digester gas. The produced biogas can be utilized as a fuel source for a process heating boiler or in a combined heat and power system or renewable natural gas.

Finally, the presentation will include case study overviews of two functioning wastewater treatment facilities with anaerobic digestion, both which are receiving significant quantities of organic wastes to generate biogas from co-digestion. One facility is utilizing biogas produced in a combined heat & power (CHP) for use at the facility and has achieved net zero operations beginning in 2022. The second facility facility has a very large high strength waste program with over 19,000 loads received annually. The biogas from this facility is processing the biogas into renewable natural gas (RNG) for pipeline injection which generates over $6M annually.
Learning Objectives:
1. Gain understanding of the industry drivers for organics diversion and resource recovery programs.
2. Learn about two functioning full-scale wastewater treatment facilities with anaerobic digestion, both which are receiving significant quantities of organic wastes to generate biogas from co-digestion.
3. Define the concept the organics diversion, such as food waste and the co-digestion of these wastes with anaerobic digestion which generated biogas and potential value of this renewable fuel."

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