Feasibility and pilot study of coupled anaerobic digester and pyrolyzer for co-processing organic waste to renewable natural gas and biochar

厌氧消化器和热解器联合处理有机废物生产可再生天然气和生物炭的可行性和中试研究

• 批准号: 558338-2020
• 负责人: Bi, XiaotaoXT
• 金额: $ 7.36万
• 依托单位: University of British Columbia
• 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=746714
• 关键词: Feasibility; pilot; study; coupled; anaerobic

Anaerobic digestion (AD) technologies can produce carbon-neutral renewable natural gas (RNG) thatsignificantly decarbonizes the energy system and reduces GHG emissions. Additional benefits include reducinglocal atmosphere pollution from animal waste storage and land spreading, maximizing the value of biomasswaste and producing organic fertilizers from digestate to reduce the overall cost of RNG production. There aresome small-scale facilities in British Columbia for anaerobic digestion of agricultural waste and urbansource-separated organics for biogas production. However, to deploy AD system broadly for the production ofRNG in large quantity at large scale to meet the government's RNG blending target, several challenges stillneed to be overcome to improve the AD system efficiency in treating various organic waste feedstock, reducecarbon footprint, and better manage the waste digestate streams. Integrated AD-pyrolysis system was arelatively new approach to increase the stability of AD reactor and biogas production, and it has shown a greatpromise in increasing the overall energy conversion from 33-50% of single AD reactor to more than 80% in thecombined AD-pyrolysis system. Majority of studies to date have been performed in components in laboratoryor small pilot units without integration. We propose to systematically evaluate the feasibility of an integratedanaerobic digestion and microwave pyrolysis system based on environmental and techno-economic analysesand the test of a small pilot AD reactor and a microwave-assisted fluidized bed pyrolysis reactor. The focus ison the AD reactor performance for co-digestion of crop residues, yard waste, food waste and animal waste withthe addition of pyrolysis aqueous liquid (APL) and biochar, microwave catalytic pyrolysis of solids digestatefor biochar production and the optimization of biochar properties as an additive to the AD reactor to improveAD performance and for other applications. The overall objective of this project is to provide stakeholders anAD+pyrolysis technology to meet the renewable natural gas blending demands and greenhouse gas emissionsreduction targets in British Columbia and Canada.

厌氧消化(AD)技术可以产生碳中性的可再生天然气(RNG)，显著降低能源系统的碳含量并减少温室气体排放。其他好处包括减少动物粪便储存和土地扩散造成的当地大气污染，最大限度地提高生物质废物的价值，以及从沼泽地生产有机肥料以降低RNG生产的总体成本。不列颠哥伦比亚省有一些小型设施，用于厌氧消化农业废物和用于沼气生产的城市源分离有机物。然而，要广泛应用AD系统来大规模生产RNG，以满足政府的RNG混合目标，还需要克服几个挑战，以提高AD系统在处理各种有机废物原料方面的效率，减少碳足迹，并更好地管理废物沼气流。AD-热解一体化系统是提高AD反应器和沼气生产稳定性的一种较新的方法，在将单个AD反应器的总能量转化率从33-50%提高到80%以上方面显示出很大的潜力。到目前为止，大多数研究都是在实验室或小型试点单位的部件中进行的，没有进行整合。我们建议在环境和技术经济分析的基础上，通过小型中试AD反应器和微波辅助沸腾床热解反应器的试验，系统地评价厌氧消化和微波热解一体化系统的可行性。重点研究了添加热解水液(APL)和生物炭的AD反应器在作物残渣、庭院垃圾、食物垃圾和动物垃圾共消化中的性能，用于生物炭生产的固体消化液的微波催化热解，以及作为AD反应器添加剂的生物炭性能的优化，以改善AD性能和用于其他应用。该项目的总体目标是为利益相关者提供ANAD+热解技术，以满足不列颠哥伦比亚省和加拿大的可再生天然气混合需求和温室气体减排目标。