探討循環經濟，促進農業循環永續發展──以沼氣發電回收單質硫防治白粉病為例

Exploring the Circular Economy and Promoting Sustainable Development of Agricultural Cycle: A Case Study of Biogas Power Generation and Recovery of Mono-mass Sulfur to Control Powdery Mildew

沼氣發電是生質能發展的重點項目之一，而沼氣發電運作正常時，脫硫設備去除硫化氫的效率是關鍵所在。本研究旨在利用生物洗滌法脫除硫化氫後回收單質硫，並應用於白粉病的防治資材中。白粉病每年造成全球農業經濟的巨大損失。透過將硫化氫轉化為可循環利用的單質硫粉技術，不僅可以改善空氣污染，防止白粉病的擴散，還可以增加農業生產，實現循環和永續發展的未來趨勢。
研究方法方面，利用專利型模擬回收器來回收脫硫塔中的單質硫，以生石灰、硫粉和純水按照1：3：6的比例進行混合，針對混合液進行了1：200、1：300和1：500三種倍率的稀釋。白粉病防治實驗進行了3週，每週噴灑一次，共計3次，將稀釋液噴灑在月橘、南瓜和桂花三種植物上，測量葉面白粉病的擴散面積並計算葉面罹病度，作為防治效果的指標。研究結果顯示，稀釋倍率為1：200的稀釋液對於白粉病植株和葉面罹病度的防治效果最佳。白粉病的罹病度由24％（2級）降至11.2％（1級），去除率達到了58％。其他兩種稀釋倍率也達到了20％以上的防治效果。透過將硫化氫轉化為可循環利用的農業防治資材，不僅可以解決硫化氫對空氣污染和環境品質的影響，還對全球氣候變遷、資源永續和農業生產，具有正面意義。

Biogas power generation is a key focus in the development of biomass energy. During its operation, the efficiency of desulfurization equipment in removing hydrogen sulfide（H₂S）is critical. The aim of this study is to recover mono-sulfur from hydrogen sulfide removal by biological scrubbing and apply it to powdery mildew control materials. Powdery mildew causes huge losses to the global agricultural economy every year. By converting hydrogen sulfide into recyclable elemental sulfur powder, this technology not only reduces air pollution and prevents the spread of powdery mildew, but also enhances agricultural productivity—advancing the future trend of circular and sustainable development. A dilute solution was sprayed on murraya paniculata, pumpkin and osmanthus fragrans to measure the spread of powdery mildew on the foliage and to calculate the degree of disease on the foliage as an indicator of the effectiveness of control. The results of the study showed that a dilution rate of 1：200 was the most effective in the control of powdery mildew plants and foliar disease. The level of powdery mildew disease was reduced from 24%（grade 2）to 11.2%（grade 1）, achieving a 58% removal rate. The other two dilution rates also achieved over 20% control. By transforming hydrogen sulfide into a recyclable material for agricultural use, its negative impact on air pollution and environmental quality can be mitigated. This approach also contributes positively to addressing global climate change, promoting resource sustainability, and enhancing agricultural productivity.