Abstract
This paper presents mass flow and energy balance as well as an economic analysis for a biogas plant in a rice–wine–pig system at a practical rather than laboratory scale. Results showed feeding amount was 65.30td−1 (total solid matter (TSM) 1.3%) for the normal temperature continuous stirred tank reactor (CSTR), and 16.20td−1 (TSM 8.4%) for the mesophilic CSTR. The digestion produced 80.50td−1 of mass, with 76.41td−1 flowing into rice fields and 4.49td−1 into composting. Energy consumption of this plant fluctuated with seasons, and surplus energy was 823, 221kWh/year. Thus, biogas plant was critical for material recycling and energy transformation of this agro-ecosystem. The economic analysis showed that the payback time of the plant was 10.9years. It also revealed application of biogas as a conventional energy replacement would be attractive for a crop–wine–livestock ecosystem with anaerobic digestion of manure.
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