Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, Ottawa, Ontario K1A0C6, Canada.
School of Environmental Sciences, University of Guelph, Guelph, ON, Canada.
Waste Manag. 2022 Sep;151:123-130. doi: 10.1016/j.wasman.2022.07.033. Epub 2022 Aug 6.
This study quantified fugitive methane (CH) losses from multiple sources (open digestate storages, digesters and flare) at two biogas facilities over one year, providing a much needed dataset integrating all major loss pathways and changes over time. Losses of CH from Facility A were primarily from digestate storage (5.8% of biogas CH), followed by leakage/venting (5.5%) and flaring (0.2%). At Facility B, losses from digestate storage were higher (10.7%) due to shorter hydraulic retention time and lack of a screwpress. Fugitive emissions from leakage were initially 3.8% but were reduced to 0.6% after the dome membrane was repaired at Facility B. For biogas to have a positive impact on greenhouse gas emissions and provide a low-carbon fuel, it is important to minimize fugitive losses from digestate storage and avoid leakage during abnormal operation (leakage, roof failure).
本研究在一年时间内量化了两个沼气设施中多个源（开放式消化液储存池、消化池和火炬）的逸散甲烷（CH）损失，提供了一个急需的数据集，综合了所有主要的损失途径和随时间的变化。A 设施的 CH 损失主要来自消化液储存（沼气 CH 的 5.8%），其次是泄漏/通风（5.5%）和火炬燃烧（0.2%）。在 B 设施，由于水力停留时间短且缺乏螺旋压榨机，来自消化液储存的损失更高（10.7%）。泄漏逸散排放最初为 3.8%，但在 B 设施修复穹顶膜后降至 0.6%。为了使沼气对温室气体排放产生积极影响并提供低碳燃料，重要的是要尽量减少消化液储存过程中的逸散损失，并避免在异常运行期间发生泄漏（泄漏、屋顶失效）。
