Moving away from aeration – utilising computational fluid dynamics modelling ofmechanical mixing within an industrial scale nature-based wastewater treatment system

摆脱曝气 — 在工业规模的基于自然的废水处理系统中利用机械混合的计算流体动力学模型

• 批准号: 10092420
• 金额: $ 3.02万
• 依托单位: INDUSTRIAL PHYCOLOGY LIMITED
• 依托单位国家: 英国
• 项目类别: Collaborative R&D
• 财政年份: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=10092420
• 关键词: Moving; away; aeration; utilising; computational

The water treatment industry currently uses metal salt dosing (MSD) to precipitate the phosphorous into a sludge which can then be removed and disposed of. There has therefore been a massive increase in demand for ferric (the most used MS). The UK government's plan to achieve 'Net Zero' decarbonisation highlighted the need for WW operators to utilise alternative treatment processes, specifically nature-based solutions. UK WW companies are therefore creating 'nature-based solutions' portfolios. However, there is currently a shortfall in nature-based solutions that can be retrofitted into small rural sites.Microalgae are single-celled aquatic organisms that can use the energy from light to take up simple nutrients from their environment along with CO2\. When used in a controlled system, microalgae can be used to remove contaminants from WW. Industrial Phycology (I-PHYC) have developed a unique process which exploits the ability of microalgae to quickly treat wastewater of multiple contaminants to low levels.Mixing is a critical factor for achieving an efficient process in the algal systems because of its role in the distribution of light and nutrients, and diffusion of gases throughout the culture. I-Phyc currently uses aeration However, depending on the size of the process, the blowers can represent up to 34% of average operation electrical load during processing. An alternative to sparging is to provide mass transfer by mechanical mixing, potentially leading to decreased energy consumption and process complexity. In addition, to optimise the manufacturing and assembly of the I-Phyc product the contractors are recommending we move toward a _modularised_ system. This could have a high impact on the final product's quality and reduce the project cost by an estimated 20%.However, the interaction of various factors including light location, a new tank geometry, and mixing methodology make this a complex system problem.Through the support of Innovate UK's 'A4I' competition I-PHYC will collaborate with TÜV SÜD National Engineering Laboratory, a world leading modelling facility, to generate CFD models to improve mixing and lower power requirement within the I-Phyc process, while also understanding how mixing performs in the proposed _modularised_ design. Real-time measurements and CFD will link the complex relationship between physical (mixing method), biophotonics (number of lights) and algal biology (optical density (OD)) to reduce the process energy consumption. Once a robust model is created I-PHYC can then make informed multi-layered investment decisions, allowing the I-PHYC process to establish itself has a competitive, sustainable WW process.

水处理行业目前使用金属盐投加（MSD）将磷沉淀成污泥，然后可以将其去除和处置。因此，对三价铁（最常用的MS）的需求大幅增加。英国政府实现“净零”脱碳的计划强调了WW运营商利用替代处理工艺的必要性，特别是基于自然的解决方案。因此，英国WW公司正在创建“基于自然的解决方案”组合。然而，目前缺乏基于自然的解决方案，可以改造到小的农村地区。微藻是单细胞水生生物，可以利用光的能量从环境中吸收简单的营养物质，沿着二氧化碳。当在受控系统中使用时，微藻可用于从WW去除污染物。工业藻类学（I-PHYC）开发了一种独特的工艺，利用微藻的能力快速处理多种污染物的废水，使其达到低水平。混合是藻类系统中实现高效工艺的关键因素，因为它在整个培养过程中起着光和营养物的分布以及气体扩散的作用。I-Phyc目前使用曝气，但是，根据工艺规模的不同，鼓风机在加工过程中可占平均运行电力负荷的34%。喷射的替代方案是通过机械混合提供质量传递，可能导致降低的能量消耗和工艺复杂性。此外，为了优化I-Phyc产品的制造和组装，承包商建议我们转向模块化系统。这可能会对最终产品的质量产生很大的影响，并将项目成本降低约20%。然而，各种因素的相互作用，包括光照位置，新的罐几何形状和混合方法，使其成为一个复杂的系统问题。通过Innovate UK 'A4 I'竞赛的支持，I-PHYC将与世界领先的建模机构TÜV SÜD国家工程实验室合作，生成CFD模型，以改善I-Phyc工艺中的混合和降低功率要求，同时了解混合在建议的模块化设计中的表现。实时测量和计算流体动力学（CFD）将物理（混合方法）、生物光子学（光的数量）和藻类生物学（光密度（OD））之间的复杂关系联系起来，以降低工艺能耗。一旦创建了一个强大的模型，I-PHYC就可以做出明智的多层次投资决策，使I-PHYC流程能够建立自己的竞争力，可持续的WW流程。