Simulation-based Design of Fluidized Bed Reactors for Wastewater Treatment

基于仿真的废水处理流化床反应器设计

• 批准号: 514483-2017
• 负责人: Abukhdeir, NasserMohieddin
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=639908
• 关键词: Simulation; based; Design; Fluidized; Bed

The minimization of phosporous discharge from wastewater streams into the environment is an increasinglyimportant consideration for municipalities in Canada and throughout the world. Phosphorous discharge intostreams, rivers, and lakes is one of the main drivers of eutrophication of these water bodies, where the presenceof high levels of biological nutrients results in increased growth of plants and algae. This increase subsequentlyresults in depletion of oxygen levels in water bodies which has devastating effects on fish and overallbiodiversity within aquatic ecosystems. Removal of phosphorous from wastewater is thus a key area ofresearch and development in CanadaOstara Nutrient Recovery Inc. (Ostara) has developed technologies which enable the recovery of phosphorousfrom wastewater streams in a way such that the recovered phosphorous containing solids (struvite) may be usedas a slow-release fertilizer. Ostara's core technology is the Pearl® fluidized bed reactor, is able to recover up to50% of phosphorous from a wastewater treatment plant and outputs (from the process) phosphorous-richfertilizer production, in a form ready for distribution. At the heart of this technology is a complex multiphasefluidized crystallization process where polydisperse (struvite) solid particles are dispersed in amulti-component liquid phase (wastewater).Further advancement of the Ostara's Pearl reactor technology requires multiphase CFD simulations to enableresolution of the internal multiphase hydrodynamics and, simultaneously, the mass transfer resulting from thecrystallization process occurring at the solid/liquid interface. This research involves the use of the "spectrum"of two-phase flow models in order to determine the most accurate one for Ostara's unique polydispersefluidized bed reactor.

对于加拿大和全世界的城市来说，最大限度地减少从废水流中排放到环境中的磷是一个越来越重要的考虑因素。磷排放到溪流、河流和湖泊中是这些水体富营养化的主要驱动因素之一，其中高水平的生物营养物的存在导致植物和藻类的生长增加。这种增加会导致水体中氧气水平的耗尽，对鱼类和水生生态系统中的整体生物多样性产生破坏性影响。因此，从废水中去除磷是加拿大Ostara营养回收公司研究和开发的一个关键领域。（Ostara）已经开发了能够从废水流中回收磷的技术，使得回收的含磷固体（鸟粪石）可以用作缓释肥料。Ostara的核心技术是Pearl®流化床反应器，能够从废水处理厂回收高达50%的磷，并以可供分配的形式（从该过程中）产出富磷肥产品。该技术的核心是一个复杂的多相流化结晶过程，其中多分散（鸟粪石）固体颗粒分散在多组分液相（废水）中。Ostara Pearl反应器技术的进一步发展需要多相CFD模拟，以解决内部多相流体动力学问题，同时解决固/液界面处发生的结晶过程导致的传质问题。这项研究涉及使用的“频谱“的两相流模型，以确定最准确的Ostara的独特polydispersefluidized床反应器。