GOALI: Development of Spatiotemporal Metabolic Models for Syngas Fermentation in Industrial Bubble Column Reactors

Henson-1511346可再生液体燃料和化学品最有希望的途径之一是由专门的微生物发酵废碳。这不仅可以使先进的生物燃料和可再生化学品生产成为可能，还可以帮助减少碳排放。气体发酵技术的商业化开发正由LanzaTech等新兴公司领导，但必须解决许多基础研究问题，以进一步推动该技术走向经济竞争力。一个特别重要的挑战是开发描述工业相关鼓泡塔反应器中气体发酵的综合代谢和运输模型。这类时空代谢模型的开发是一个新兴的研究问题，在环境科学、生物技术、生物能源和人类健康等领域具有潜在的应用前景。GALI项目的目标是开发用于时空代谢模拟的通用工具，并通过应用于鼓泡塔反应器的气体发酵来评估这些方法。PI计划在鼓泡塔反应器中将富含CO的废气和合成气(主要由H2/CO/CO2组成)转化为液体燃料和化学品。他提出的建模方法包括将物种新陈代谢的基因组规模重建与控制空间变化系统内相关对流和/或扩散过程的传输方程相结合。由此产生的模型由细胞内代谢的线性程序组成，嵌入了细胞外环境中空间和动态变化的部分不同方程。UMASS将利用气体发酵和生物膜生长问题开发高效的模型公式和强大的数值求解技术，就像在硅胶试验台中一样。合成气发酵模型将与气体发酵和鼓泡塔反应器技术的行业领先者LanzaTech合作开发。这些模型将通过将最近开发的合成气发酵细菌永达氏梭菌的基因组规模的代谢重建与原料气组分和主要代谢副产物乙醇和醋酸酯的对流传输方程相结合来建立。在马萨诸塞州大学进行初步测试后，合成气体发酵模型将使用从LanzaTech实验室/中试设施收集的数据进行验证。利用这些数据，时空代谢模型将根据需要进行改进，以捕捉工业鼓泡塔反应器的关键特征。广泛的影响：拟议的研究既将促进基础研究，又将影响工业实践。虽然一些关于时空代谢建模的孤立论文已经发表，但我们的研究将产生对这一重要问题的更广泛的治疗。我们期望以合成气发酵为重点的应用工作能够产生新的计算工具来模拟、设计和优化工业鼓泡塔反应器。这位由美国国家科学基金会资助的麻省理工学院研究生将在伊利诺伊州S·斯科基的研究机构完成为期四个月的实习，以参与数据收集并执行模型改进和验证。这名学生将由两名项目研究人员共同提供建议，由Henson教授(加州大学马萨诸塞州分校)领导方法开发工作，Griffin博士(LanzaTech，联席PI)监督鼓泡塔模型开发工作。在LanzaTech期间，该学生将在高度多学科和以团队为导向的环境中与广泛的科学家和工程师合作。将通过频繁的电子邮件交换、每两周举行一次的视频会议和一年两次的项目会议，实现联合马撒大学和LanzaTech努力的紧密结合。至少有两名本科生将参与这项研究，让受资助的博士生担任部分顾问角色。这些学生将与马萨诸塞州生物燃料研究所(TIMBR)资助的其他学生互动，并参与正在进行的TIMBR活动。

Henson - 1511346One of the most promising routes to renewable liquid fuels and chemicals is the fermentation of waste carbon by specialized microbes. This can not only enable advanced biofuel and renewable chemical production but could also help reduce carbon emissions. Commercial development of gas fermentation technology is being led by emerging companies such as LanzaTech, but many fundamental research problems must be addressed to further advance the technology towards economic competitiveness. A particularly important challenge is to develop integrated metabolic and transport models that describe gas fermentation in industrially relevant bubble column reactors. The development of such spatiotemporal metabolic models is an emerging research problem with numerous potential applications in environmental science, biotechnology, bioenergy and human health. The objectives of this GOALI project are to develop general tools for spatiotemporal metabolic modeling and to evaluate the methods through application to gas fermentation in bubble column reactors.The PIs plan to convert CO-rich waste streams as well as synthesis gas (syngas - mainly comprised of H2/CO/CO2) to liquid fuels and chemicals in bubble column reactors. His proposed modeling approach involves combining genome-scale reconstructions of species metabolism with transport equations that govern the relevant convective and/or diffusional processes within the spatially varying system. The resulting models consist of linear programs for intracellular metabolism embedded within partial different equations for spatial and dynamic variations within the extracellular environment. UMass will develop efficient model formulation and robust numerical solution techniques using gas fermentation and biofilm growth problems as in silico testbeds. The syngas fermentation models will be developed in collaboration with LanzaTech, an industrial leader in gas fermentation and bubble column reactor technology. These models will be formulated by combining a recently developed genome-scale metabolic reconstruction of the syngas fermenting bacterium Clostridium ljungdahlii with convective transport equations for the feed gas components and the major metabolic byproducts, ethanol and acetate. Following initial testing at UMass, the syngas fermentation models will be validated with data collected from a LanzaTech laboratory/pilot facility. Using these data, the spatiotemporal metabolic models will be refined as necessary to capture the key features of industrial bubble column reactors.Broader Impacts: The proposed research will both advance fundamental research and impact industrial practice. While a few isolated papers have been published on spatiotemporal metabolic modeling, our research will produce a considerably more general treatment of this important problem. We expect the application work focused on syngas fermentation to produce new computational tools to simulate, design and optimize industrial bubble column reactors. The UMass graduate student supported by NSF funds will complete a four month internship at LanzaTech?s Skokie, IL research facility to participate in data collection and to perform model refinement and validation. The student will be co-advised by the two project investigators, with Prof. Henson (UMass, PI) leading the methods development work and Dr. Griffin (LanzaTech, co-PI) overseeing the bubble column model development work. While at LanzaTech, the student will work with a broad array of scientists and engineers in a highly multidisciplinary and team oriented environment. Tight integration of the UMass and LanzaTech efforts will be achieved through frequent email exchanges, biweekly videoconferences and biannual project meetings. At least two undergraduate students will participate in the research by having the funded Ph.D. student serve a partial advising role. These students will interact with other students funded through the Institute of Massachusetts Biofuels Research (TIMBR) and participate in ongoing TIMBR activities.