GHG Emission Reduction and Renewable Energy Production Through Anaerobic Digestion of Organic Wastes and Biogas Production

通过有机废物厌氧消化和沼气生产减少温室气体排放和生产可再生能源

• 批准号: RGPIN-2020-05027
• 负责人: Abdehagh, Niloofar
• 金额: $ 2.04万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=749458
• 关键词: GHG; Emission; Reduction; Renewable; Energy

This research plan is designed to cover three main research directions related to biogas production and anaerobic digestion including, nutrient recovery, feedstock recipe optimization and Anaerobic Digestion (AD) process modelling. The main goals are: I) to develop an integrated nutrient recovery process for Nitrogen, Phosphate and Potassium (NPK) recovery from anaerobic digestate to use as biofertilizer, II) to optimize the feedstock recipe to maximize biogas production and minimize the process inhibition using different combinations of varied types of organic materials, and III) to model the AD process including pre-treatment, digestion and downstream processing considering all possible inhibitory effects, ammonia removal and nutrient recovery in the process. Based on this detailed research plan, there are several breakdown objectives for each of these directions ultimately leading to address these current important challenges in the biogas field. In the first research direction, the focus will be on separating NPK from digestate for two objectives. First, to produce a nutrient-rich product as biofertilizer replacing commercial inorganic fertilizers reducing GHG emission and closing the loop for nutrients. Second, to decrease the volume of the digestate to avoid the current transportation costs and environmental issues. The separation methods to be tested include electromagnetic phosphorous removal and biopolymer treatment techniques. Different separation techniques such as membrane filtration, evaporation, slope screen and the combination of these techniques will be investigated to develop a process to produce biofertilizer and water from digestate. In the second research direction, the main focus will be on developing a guideline to formulate the optimized feedstock recipes maximizing the productivity and minimizing the process inhibition while providing all necessary substrates for healthy biogas plant operation. This will allow to formulate the feedstock recipe based on each material category (protein, fat, CHO, lignin and fiber content) to predict the biogas production in the plants where specific feedstock materials are available. The main benefit would be maximizing the productivity without the need to run time-consuming and expensive lab-tests. Finally, the focus of the third research direction will be on developing a model to simulate AD processes from front-end to back-end including pretreatment, digestion and downstream processing. One of the main focuses of this project will be investigating the inhibitory effect of ammonia and also to enhance the model by incorporating the ammonia stripping process. The main benefits of the proposed project include evaluation of new substrates with unknown behavior, reduced cost for substrate evaluation, process stability verification, prediction of critical components, simulating the anaerobic digestion combined with ammonia striping and substrates behavior of complex interactions in a digester.

本研究计划旨在涵盖与沼气生产和厌氧消化相关的三个主要研究方向，包括营养物回收、原料配方优化和厌氧消化（AD）过程建模。主要目标是：1)开发从厌氧消化中回收氮、磷酸盐和钾（NPK）作为生物肥料的综合营养回收工艺；2)优化原料配方，以最大限度地提高沼气产量，并使用不同类型有机材料的不同组合将过程抑制降到最低；3)模拟AD过程，包括预处理、消化和考虑所有可能的抑制效应的下游处理。过程中氨的去除和营养物的回收。基于这一详细的研究计划，每个方向都有几个细分目标，最终导致解决当前生物天然气领域的这些重要挑战。在第一个研究方向上，重点是将NPK从消化物中分离出来，以实现两个目标。首先，生产一种营养丰富的产品作为生物肥料，取代商业无机肥料，减少温室气体排放，关闭养分循环。第二，减少消化池的体积，避免目前的运输成本和环境问题。待测试的分离方法包括电磁除磷和生物聚合物处理技术。将研究不同的分离技术，如膜过滤、蒸发、斜坡筛和这些技术的组合，以开发一种从消化液中生产生物肥料和水的工艺。在第二个研究方向上，主要重点将是制定一个指导方针，以制定优化的原料配方，最大限度地提高生产率和最小化过程抑制，同时为健康的沼气厂运行提供所有必要的底物。这将允许根据每种材料类别（蛋白质，脂肪，CHO，木质素和纤维含量）制定原料配方，以预测可获得特定原料的工厂的沼气产量。这样做的主要好处是可以最大限度地提高生产率，而不需要进行耗时且昂贵的实验室测试。最后，第三个研究方向的重点将是开发一个模型来模拟AD从前端到后端的过程，包括预处理、消化和下游加工。该项目的主要重点之一将是研究氨的抑制作用，并通过纳入氨提过程来增强模型。该项目的主要优势包括评估具有未知行为的新底物，降低底物评估成本，验证工艺稳定性，预测关键组分，模拟厌氧消化结合氨条带和底物在沼气池中复杂相互作用的行为。