CFD analysis of liquid flow pattern and floc particulates in a new multi-environment wastewater treatment system

新型多环境废水处理系统中液体流动模式和絮凝颗粒的 CFD 分析

• 批准号: 408096-2010
• 负责人: Li, Samuel
• 金额: $ 1.73万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=472796
• 关键词: CFD; analysis; liquid; flow; pattern

The investigation of bioreactor hydrodynamics is a prerequisite for its proper design and scale up which are required for full-scale operation of industrial bioreactors. These studies provide information about liquid retention time and flow patterns, gas hold up, oxygen transfer coefficient and power input per liquid volume in the bioreactor. Hydrodynamic evaluations have been traditionally carried out at laboratory- or pilot-scale setups, requiring elaborate experiments and rigorous methodologies conducted at an extended period of time. The use of multi-environment bioreactors that use hybrid designs and require lower capital and operational costs are encouraged in industrial operations due to the numerous technical and economical advantages that they offer compared to the conventional technologies. However, these bioreactors, due to their unconventional design and operation strategies, require a thorough hydrodynamic evaluation in order to ensure their adequate design and scale up. In view of this, industries often complement hydrodynamic characterization studies with computer modeling and simulation analysis in order to expand the examined range of parameters in a shorter time and at a fraction of usual expenses. It is the objective of the proposed project to employ computational fluid dynamics (CFD) analysis to evaluate the hydrodynamic characteristics of new multi-environment bioreactors, advancing the understanding of their operation principles while facilitating their optimized design at large-scale operations. Special focus will be on the impact of bioreactor geometry and operating conditions including influent liquid and air flow rates on liquid flow pattern and circulation, residence time distribution in various zones of bioreactors, as well as particulate trajectories and floc precipitation rate. The proposed research project will be carried out under the joint supervision of researchers at Concordia University and SNC-Lavalin. This project will provide excellent training for graduate students, and specialized skills particularly attractive to the water and wastewater treatment industry.

生物反应器流体力学的研究是生物反应器合理设计和放大的前提，而生物反应器的设计和放大又是生物反应器工业化生产的前提。这些研究提供了有关液体停留时间和流动模式，气体滞留，氧传递系数和每液体体积的生物反应器中的功率输入的信息。流体动力学评价传统上是在实验室或中试规模的装置上进行的，需要在较长的时间内进行精心设计的实验和严格的方法。在工业操作中鼓励使用使用混合设计并且需要较低资本和操作成本的多环境生物反应器，这是由于与常规技术相比它们提供了许多技术和经济优势。然而，这些生物反应器，由于其非常规的设计和操作策略，需要一个彻底的流体动力学评价，以确保其适当的设计和规模。有鉴于此，工业界经常用计算机建模和仿真分析来补充流体动力学特性研究，以便在较短的时间内扩大参数的检查范围，并节省通常的费用。该项目的目标是采用计算流体动力学（CFD）分析来评估新的多环境生物反应器的流体动力学特性，促进对其操作原理的理解，同时促进其在大规模操作中的优化设计。将特别关注生物反应器的几何形状和操作条件的影响，包括流入液体和空气流速对液体流动模式和循环，停留时间分布在生物反应器的各个区域，以及颗粒轨迹和絮凝沉淀率。拟议的研究项目将在Concordia大学和SNC-Lavalin的研究人员的联合监督下进行。该项目将为研究生提供优秀的培训，并提供对水和废水处理行业特别有吸引力的专业技能。