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(AD)技术可以生产碳中性可再生天然气(RNG)， 显著降低能源系统的碳化程度，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，最大限度地发挥生物质的价值 从沼泽地产生废物和生产有机肥，以降低RNG生产的总体成本。确实有 不列颠哥伦比亚省一些小型设施，用于农业废物和城市垃圾的厌氧消化 用于沼气生产的源分离有机物。然而，要广泛部署AD系统来生产 RNG大批量、规模化要达到政府的RNG混合目标，仍有几个挑战 需要克服的问题是提高AD系统处理各种有机废物原料的效率，减少 碳足迹，并更好地管理垃圾填埋场溪流。一体式AD-热解系统是一种 相对较新的提高AD反应器和沼气生产稳定性的方法，并显示出很大的潜力 承诺将总能量转化率从单个AD反应堆的33%-50%提高到20%以上 AD-热解联合系统。到目前为止，大多数研究都是在实验室的组件中进行的 或没有整合的小型试点单位。我们建议系统地评估一个综合的 基于环境与技术经济分析的厌氧消化-微波热解系统 小型中试AD反应器和微波辅助沸腾床热解反应器的试验。重点是 秸秆、庭院垃圾、厨余垃圾和畜禽垃圾共消化的AD反应器性能研究 添加热解水液(APL)和生物炭，微波催化热解固体沼气 对于生物质炭的生产和生物质炭性能的优化作为AD反应器的添加剂进行改进 广告性能和其他应用程序。该项目的总体目标是为利益相关者提供 AD+热解技术，满足可再生天然气调合需求和温室气体排放 不列颠哥伦比亚省和加拿大的减排目标。

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