6. Main Results on the Global Economic and Environmental Analyses of the Different Scenarios of Extraction of Phenolic Compounds from Yerba Mate .
| scenario | conventional | two-stage | four-stage |
|---|---|---|---|
| economic aspects | |||
| equipment cost (US$) | 6493 | 5929 | 4476 |
| energy cost (US$ year–1) | 21,909 | 21,909 | 21,908 |
| total capital investment (US$) | 17,082 | 15,600 | 11,777 |
| total production cost (US$ year–1) | 129,587 | 129,231 | 128,311 |
| environmental aspects | |||
| energy saving1 (MJ year–1) | - | 431.6 | 681.1 |
| CO2 emission savingoil system (kg year–1) | - | 32.4 | 51.1 |
| CO2 emission saving–biofuel system (kg year–1) | - | 30.0 | 47.3 |
| CO2 emission saving–hydroelectric system (kg year–1) | - | 0.480 | 0.757 |
a
Energy saving is calculated as the difference between the energy consumption of the evaluated scenario and the energy consumption of the conventional scenario (1).