The work performed under this grant resulted in the development of new technologies that will help advance anaerobic digestion for producing renewable natural gas as a transportation fuel. It will also help improve the profitability of anaerobic digestion as a beneficial technology, which will ultimately help expand the use and usefulness of an anaerobic digester and reduce dependence on non-renewable energy.
The purpose of this project was to design, construct, and operate a novel fertilizer production system that will produce value added fertilizer products from digester effluent, improving the economics of biomethane production as a transportation fuel. The fertilizer production system was designed to create multiple pre-designed fertilizer products or custom products, depending on the local market demand, as a method of enhancing the economic feasibility of the anaerobic digester system.
Food waste is the most prevalent type of material in California’s waste stream, totaling 6,158,120 tons per year. With 10% market penetration, 613,200 tons per year of waste can be diverted from landfills, 69,300 MT CO2e GHG emissions per year can be reduced, and 11,827 tons per year of fertilizer can be produced as a renewable co-product.