Amaral Andreia, Schraa Oliver, Rieger Leiv, Gillot Sylvie, Fayolle Yannick, Bellandi Giacomo, Amerlinck Youri, Mortier Séverine T F C, Gori Riccardo, Neves Ramiro, Nopens Ingmar
BIOMATH, Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure Links 653, Ghent 9000, Belgium E-mail:
inCTRL Solutions Inc., 470 Anthony Drive, Oakville, ON L6J 2K5, Canada.
Water Sci Technol. 2017 Feb;75(3-4):507-517. doi: 10.2166/wst.2016.365.
Aeration is an essential component of aerobic biological wastewater treatment and is the largest energy consumer at most water resource recovery facilities. Most modelling studies neglect the inherent complexity of the aeration systems used. Typically, the blowers, air piping, and diffusers are not modelled in detail, completely mixed reactors in a series are used to represent plug-flow reactors, and empirical correlations are used to describe the impact of operating conditions on bubble formation and transport, and oxygen transfer from the bubbles to the bulk liquid. However, the mechanisms involved are very complex in nature and require significant research efforts. This contribution highlights why and where there is a need for more detail in the different aspects of the aeration system and compiles recent efforts to develop physical models of the entire aeration system (blower, valves, air piping and diffusers), as well as adding rigour to the oxygen transfer efficiency modelling (impact of viscosity, bubble size distribution, shear and hydrodynamics). As a result of these model extensions, more realistic predictions of dissolved oxygen profiles and energy consumption have been achieved. Finally, the current needs for further model development are highlighted.
曝气是好氧生物废水处理的一个重要组成部分，也是大多数水资源回收设施中最大的能源消耗环节。大多数建模研究忽略了所使用曝气系统固有的复杂性。通常情况下，鼓风机、空气管道和曝气器没有进行详细建模，采用串联的完全混合反应器来代表推流反应器，并使用经验关联式来描述操作条件对气泡形成和传输以及氧气从气泡向主体液体转移的影响。然而，其中涉及的机制本质上非常复杂，需要大量的研究工作。本论文强调了在曝气系统的不同方面为何以及何处需要更详细的信息，并汇总了近期为开发整个曝气系统（鼓风机、阀门、空气管道和曝气器）的物理模型所做的努力，以及在氧气传递效率建模方面（粘度、气泡尺寸分布、剪切力和流体动力学的影响）增加严谨性的工作。由于这些模型扩展，已实现了对溶解氧分布和能源消耗更现实的预测。最后，强调了当前对进一步模型开发的需求。
