Research Article
Nonrenewable Energy Cost and Greenhouse Gas Emissions of a “Pig-Biogas-Fish” System in China
Table 5
FE cost and GEin emissions of the conventional animal husbandry system.
| | Materials | Quantity | Unit | (MJ/unit) | (kg CO2-eq/unit) | FE (MJ/yr) | GEin (kg CO2-eq/yr) |
| Pigsty | Cement | | kg/yr | 6.36 | 0.53 | | | Lime | | kg/yr | 4.94 | 0.79 | | | Hollow bricks | | kg/yr | 6.36 | 0.53 | | | Steel | | kg/yr | 64.5 | 2.03 | | | Feed | | kg/yr | 4.64 | 0.52 | | | Drugs | | kg/yr | 134 | 3.00 | | | Disinfectant | | kg/yr | 46.9 | 1.68 | | | Water | | ton/yr | 34.6 | 0.81 | | | Electricity | | kWh/yr | 135 | 2.82 | | |
| Farmers | Coal | | kg/yr | 29.56 | 3.2 | | |
| Fishpond | Lime | | kg/yr | 4.94 | 0.78 | | | Bleach | | kg/yr | 46.9 | 1.68 | | | Feed | | kg/yr | 4.64 | 0.52 | | | Aerator | | $/yr | 32.4 | 2.24 | | | Nitrogen | | kg/yr | 67.8 | 1.64 | | | Phosphate | | kg/yr | 36.2 | 1.05 | | |
| Total | | | | | | | |
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*Zhou [24].
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