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Outline
This study adopts a life cycle assessment (LCA) framework to define the system boundary for greenhouse gas (GHG) emission accounting across the entire food waste collection, transportation, and treatment process. Emission sources and gas types were identified to establish a comprehensive emission inventory, upon which a modular and decomposable GHG emission accounting model was developed based on the emission factor method. The results indicate that the full-process system boundary encompasses nine accounting units and seven major categories of GHG emission sources. Compared to conventional models, the proposed model demonstrates distinct advantages in accounting accuracy, modularity, flexibility, and scenario adaptability. A case study was conducted for the Chaoyang District of Beijing to validate the model. The findings show that GHG emissions are particularly significant at the waste disposal sites and during vehicle transportation, with emission rates of 1.38 and 1.32 tCO2e/d, respectively. Fossil fuel combustion was identified as the dominant emission source, contributing 24.4% of total emissions. In the treatment and disposal phase, wastewater treatment exhibited the highest emissions, reaching 4.05tCO2e/d, or 32.3% of the total. Carbon offsetting efforts achieved a reduction of 53.2tCO2e/d. Sensitivity analysis revealed that food waste generation volume and biogas yield have the most significant impact on total GHG emissions, while the influence of total vehicle kilometers traveled and electricity emission factors was comparatively minor.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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