Modeling the performance of the anaerobic phased solids digester system for biogas energy production.

摘要: Abstract A process model was developed to predict the mass and energy balance for a full-scale (115 t d −1 ) high-solids anaerobic digester using research data from lab pilot scale (1–3000 kg d  wet waste) systems. Costs revenues were estimated in consultation with industry partners 20-year project cash flow, net present worth (NPW), simple payback, internal rate of return, revenue requirements calculated. The NPW used compare scenarios order determine financial viability generator heat electricity or pressure swing adsorption unit converting biogas compressed natural gas (CNG). consisted five 786 m 3 reactors (one biogasification reactor four hydrolysis reactors) treating 50:50 mix (volatile solids basis) food green waste, which 17% became biogas, 32% residual solids, 51% wastewater. projects similar whether producing CNG, as long parasitic demand satisfied produced. When only, power output 1.2 MW, 7% consumed parasitically. system produced 2 hm  y after 22% supplied demand. financially viable CNG discount rates up 13% y without considering debt (all capital considered equity), sales, feed-in tariffs tax credits.