Pilot demonstration of micro-aeration for anaerobic digestion

微曝气厌氧消化中试示范

• 批准号: 577028-2022
• 负责人: Dhar, BiproBR
• 金额: $ 15.19万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=748916
• 关键词: Pilot; demonstration; micro; aeration; anaerobic

This proposal focuses on the pilot-scale development and refinement of micro-aeration technology for in-situ biogas desulfurization in anaerobic digestion. The biogas from anaerobic digesters requires extensive purification processes prior to its utilization, such as heat and power generation or upgrading to renewable natural gas (RNG) or pipeline-quality biogas. Notably, volatile sulfur compounds, such as hydrogen sulfide and other organosulfur compounds in biogas, are detrimental to metal pipes and biogas utilization equipment. Due to the high cost of end-pipe biogas desulfurization technologies, most anaerobic digestion facilities flare biogas, leading to significant greenhouse gas (GHG) emissions. Micro-aeration is an emerging and potentially low-cost alternative desulfurization method, which is operated via controlled injection of a little amount of air or pure oxygen into digesters. This proposal builds upon our preliminary bench-scale testing results and aims to advance micro-aeration regarding process design, control/monitoring, maintenance, and detailed techno-economic assessment toward its full-scale application. Developing micro-aeration as a low-cost desulfurization process in the proposed project will promote biogas utilization and reduce GHG emissions by reducing biogas flaring. Besides enhancing biogas quality in the partner organization's full-scale anaerobic digestion facility, the lessons learned from the project will also be helpful to other anaerobic digestion facilities in waste and wastewater sectors across Canada.

本项目的重点是厌氧消化中微曝气原位沼气脱硫技术的中试开发和完善。来自厌氧消化池的沼气在利用之前需要进行广泛的净化过程，例如供热和发电或升级为可再生天然气（RNG）或管道质量的沼气。值得注意的是，挥发性硫化合物，如硫化氢和沼气中的其他有机硫化合物，对金属管道和沼气利用设备有害。由于末端管道沼气脱硫技术的高成本，大多数厌氧消化设施燃烧沼气，导致大量的温室气体（GHG）排放。微曝气是一种新兴的、潜在的低成本脱硫方法，它通过控制少量空气或纯氧注入消化池来操作。该提案建立在我们初步的实验室规模测试结果的基础上，旨在推进微曝气在工艺设计、控制/监测、维护和详细的技术经济评估方面的全面应用。在拟建项目中开发微曝气作为一种低成本的脱硫工艺，将促进沼气利用，并通过减少沼气燃烧来减少温室气体排放。除了提高伙伴组织全面厌氧消化设施的沼气质量外，从该项目中吸取的经验教训也将有助于加拿大各地废物和废水部门的其他厌氧消化设施。