Multiscale Modeling of Hybrid CSTR/Biofilm Based Multi-Vessel Reactors for Anaerobic Digestion Processes

用于厌氧消化过程的基于混合 CSTR/生物膜的多容器反应器的多尺度建模

• 批准号: 560564-2020
• 负责人: Eberl, HermannJosef
• 金额: $ 1.46万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=707148
• 关键词: Multiscale; Modeling; Hybrid; CSTR; Biofilm

Anaerobic digesters are used to convert agricultural waste into biogas which then can be burned to produce electricity. Most often this biological process is a 1-stage operation in which approximately 50% of the energy of the biomass is converted. Further energy can possibly be extracted in a second stage. For this secondary process a fixed film approach is more appropriate. In this project we develop a simulation tool capable of accurately modelling such a two-stage AD process. The International Water Association Anaerobic Digestion Model No.1 (ADM1) is the quasi standard and point of departure for mathematical model development of anaerobic digestion processes. For the primary step, this will be modeled by a high-dimensional chemostat type model. To model the second stage fixed film system, ADM1 can be coupled with a Wanner-Gujer-like biofilm model. The problem associated with coupling these two model frameworks is that the computational requirements balloon owing to the high dimensionality, and the models become impractical for engineering tasks that need hundreds or thousands full simulations per run. One reason for this is that such biofilm models are designed to resolve concentration fields in the biofilm, whereas for application in reactor models only the substrate fluxes between the biofilm and the aqueus phase are required. We propose to develop a dynamic, ADM1 based multi-scale model of biofilm reactors for anaerobic digestion that correctly accounts for this mass transfer between biofilm and aqueous phase but do not resolve the spatial structure of the biofilm in detail, thus gaining computational efficiency. Such a model will be useful in the design, analysis, and optimisation of a 2 stage anaerobic digester like the on under consideration here.

厌氧消化器用于将农业废物转化为沼气，然后可以燃烧发电。大多数情况下，这种生物过程是一个1级操作，其中约50%的生物质能量被转化。在第二阶段中可以提取更多的能量。对于这种二次加工，固定膜方法更合适。在这个项目中，我们开发了一个模拟工具，能够准确地模拟这样一个两阶段的AD过程。国际水协会厌氧消化模型1（ADM 1）是厌氧消化过程数学模型开发的准标准和出发点。对于主要步骤，这将通过高维恒化器类型模型来建模。为了模拟第二阶段固定膜系统，ADM 1可以与Wanner-Gujer样生物膜模型耦合。与耦合这两个模型框架相关联的问题是，由于高维度，计算需求膨胀，并且模型对于每次运行需要数百或数千个完整模拟的工程任务变得不切实际。其原因之一是，这样的生物膜模型被设计为解决在生物膜中的浓度场，而在反应器模型中的应用程序，只有生物膜和含水相之间的底物通量是必需的。我们建议开发一个动态的，基于ADM 1的多尺度模型的生物膜反应器厌氧消化，正确占生物膜和水相之间的传质，但不解决的空间结构的生物膜的细节，从而获得计算效率。这样的模型将是有用的设计，分析和优化的2级厌氧消化器，如在这里考虑。