本研究以生命週期評估（Life Cycle Assessment, LCA）方法，系統性分析畜牧廢水能資源循環系統之環境績效，並探討優化選項。以台灣南部一畜牧場為對象，配合實驗室量測數據，建構三種廢水處理情境：傳統三段式處理（情境一）、模擬未來整合固態醱酵、厭氧醱酵、沼氣回收、微藻培植及植生固碳等資源化技術的先進系統（情境二），與進一步模擬整合方案移除微藻單元的優化方案（情境三）。透過實地調查與專業資料庫蒐集，建立完整的生命週期盤查（LCI）數據，並採用ReCiPe 2016 方法進行環境衝擊評估，涵蓋全球暖化、優養化、生態毒性、水資源消耗等 18 項中點指標，並進行終點層級總結。研究亦結合蒙地卡羅法進行不確定性分析，以及針對沼氣發電、肥料代替效益與飼料生產等關鍵參數進行敏感度分析。
結果顯示，與傳統處理相比，整合循環資源技術能有效降低溫室氣體排放（全球暖化潛勢下降約66%），並於優養化與生態毒性類項呈現淨環境效益，顯著降低水體污染與生態風險。然而，因高耗能處理單元介入，化石資源消耗與部分健康風險指標略有增加。敏感度分析指出，飼料生產過程為系統環境負荷的主要貢獻來源。綜合比較，不確定性分析顯示全球暖化等關鍵指標結果具高可信度，但毒性與水資源類指標變異較大，需持續優化在地數據蒐集與模型假設。
依據研究結果，建議以優化情境（S3）為過渡策略，逐步引入低能耗之微藻培育與產品加工，以進一步強化碳減量與營養回收，並搭配政策輔導與產業推廣加強整合循環經濟與減碳措施。同時，未來應納入經濟與社會永續維度以提升永續性評估的完整性，積極發展低碳能源與高效能資源回收技術。總體而言，本研究為台灣畜牧廢水處理轉型永續發展，提供了全面的科學依據與決策參考。

This study applies life cycle assessment (LCA) to evaluate and optimize a livestock-wastewater energy–resource recycling system at a southern Taiwan farm across three scenarios: S1 (conventional three-stage), S2 (integrated solid-state fermentation, anaerobic digestion, biogas recovery, microalgae cultivation, and vegetation-based carbon sequestration), and S3 (an optimized option with a simplified microalgae subsystem). Based on on-site surveys and professional databases, we compiled an LCI and assessed 18 ReCiPe 2016 midpoint categories with endpoint aggregation, alongside Monte Carlo uncertainty and sensitivity analyses (biogas-to-power, fertilizer substitution, feed production). Relative to S1, circular-resource integration cuts global warming potential by ~66% and yields net benefits in eutrophication and ecotoxicity, while modestly increasing fossil resource use and certain health indicators due to higher energy demand. Feed production dominates the remaining burdens. Uncertainty is low for climate results but higher for toxicity and water-use categories, indicating a need for improved local data and assumptions. We recommend S3 as a transitional pathway, with gradual re-introduction of microalgae to enhance carbo-intron and nutrient recovery, supported by policy measures and future inclusion of economic and social dimensions.

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