This research conducted an environmental life cycle assessment (LCA) to evaluate an anaerobic digestion-co-pyrolysis (ADCo-Py) system in which pyrolysis was added to traditional food waste (FW) anaerobic digestion (AD) systems to treat the solid fraction and impurities separated from FW. The solid fraction, including impurities such as wooden chopsticks, plastics, eggshells, and bones, is usually incinerated, while pyrolysis can be a viable alternative to optimize FW treatment. The environmental impact of ADCo-Py was compared with stand-alone AD, pyrolysis, and ADCo-INC (AD with incineration of separated solids). The results indicated that both ADCo-Py (−1.726 kg CO-Eq/kg) and ADCo-INC (−1.535 kg CO-Eq/kg) outperform stand-alone AD (−0.855 kg CO-Eq/kg) and pyrolysis (−0.181 kg CO-Eq/kg) in mitigating global warming potential (GWP). Additionally, pretreatments were found to have the most significant influence on GWP, ecotoxicity potential (ETP), and acidification potential (AP). The two-step pretreatment in ADCo-Py, including the separation of solids and drying, significantly improved the environmental sustainability of the system when compared with standalone pyrolysis.

中文翻译：

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新型餐厨垃圾厌氧消化热解杂交系统的环境可持续性评估

本研究进行了环境生命周期评估（LCA）来评估厌氧消化-共热解（ADCo-Py）系统，其中将热解添加到传统的食物垃圾（FW）厌氧消化（AD）系统中以处理固体部分和从 FW 中分离出杂质。固体部分，包括木筷子、塑料、蛋壳和骨头等杂质，通常会被焚烧，而热解可能是优化 FW 处理的可行替代方案。 ADCo-Py 对环境的影响与独立 AD、热解和 ADCo-INC（AD 焚烧分离固体）进行了比较。结果表明 ADCo-Py (-1.726 kg CO-Eq/kg) 和 ADCo-INC (-1.53​​5 kg CO-Eq/kg) 均优于独立 AD (-0.855 kg CO-Eq/kg) 和热解 ( −0.181 kg CO-Eq/kg) 缓解全球变暖潜力 (GWP)。此外，还发现预处理对 GWP、生态毒性潜力 (ETP) 和酸化潜力 (AP) 有最显着的影响。与独立热解相比，ADCo-Py 中的两步预处理（包括固体分离和干燥）显着提高了系统的环境可持续性。