Cost Assessment of Centralizing Swine Manure and Corn Stover Co-Digestion Systems

Livestock in the state of Iowa, United States (US) produce over 50 × 106 Mg wet-basis manure yearly. Biogas production from manure’s anaerobic digestion (AD) can reduce greenhouse gas emissions, control odors, and provide renewable energy. Despite these benefits, AD is rarely deployed at swine farms Iowa. In this work, we explore economics systems Iowa to evaluate reasons for low deployment cost impacts biogas cleaning injection into natural grid, amending with biomass, centralizing digesters across multiple farms. This work presents a static, spreadsheet-based technoeconomic model that embodies literature-based estimates key system technical parameters, costs, transportation fuel incentives permits examination various scenarios. Key findings include under assumptions, distributed, farm-scale are not competitive average prices A centralized scenario be competitive, provided programs such as low-carbon standard (LCFS) (RFS) have sufficiently high credit values.