Table 2 Main results when maximizing different profits for biogas supply network with larger capacity
Max PEconomic | Max \( {P}^{Economi{c}^{+ GHG}} \) | Max PSustainability b | |
|---|---|---|---|
Feedstock (t/y) | |||
Corn grain | 18,838 | 18,838 | 18,251 |
Corn silage | / | / | 1200 |
Corn stover | 12,844 | 12,844 | 12,444 |
Grass silage | 11,080 | 11,244 | 55,158 |
Poultry bedding | 4808 | 5635 | 1026 |
Poultry manure | 49,895 | 49,656 | 125,313 |
Poultry slurry | / | / | 32,413 |
Total feedstock | 97,464 | 98,216 | 245,804 |
Products | |||
Electricity (MWh/y) | 34,730 | 34,925 | 43,376 | 43,437 |
Heat (MWh/y) | 24,662 | 24,849 | 51,366 | 51,439 |
Digestate (23% dry solids, t/y) | 76,493 | 77,106 | 90,468 | 91,332 |
Corn grain (direct product) | 18,206 | 18,206 | 17,639 |
Water (t/y) | |||
Purchased | 26,902 | 26,892 | 63,624 |
Recycled | 71,981 | 75,306 | 738,432 |
Utilities required (MWh/y) | |||
Electricity “recycled” | 2197 | 2283 | 6968 |
Electricity purchased | 767 | 703 | / |
Heat “recycled” | 7039 | 7093 | 16,549 |
Heat source purchased | / | / | / |
Sustainability items ($/y) | |||
Economic profit | − 659,523 | − 660,736 | −3,675,154 |
Eco-profit | − 993,356 | 1,608,143 | 6,302,895 |
Social Profit | 147,697 | 148,441 | 334,676 |
Sustainability profit | −1,505,181 | 1,095,848 | 2,962,417 |
Economic+GHG profit | − 454,124 | −441,056 | −3,214,145 |
CO2 eq. emissions (t/y)a | − 7721 | − 8259 | −17,331 |
Selected Site | I | I | I, III |
Dry matter content (%) | 12.54 | 12.32 | 5.90 | 5.93 |
Methane content (%) | 57.55 | 57.53 | 55.85 | 55.93 |