Development of an energy-efficient nanobubble generator

开发节能纳米气泡发生器

• 批准号: 568554-2021
• 负责人: Kusalik, Peter
• 金额: $ 3.55万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=723569
• 关键词: Development; energy; efficient; nanobubble; generator

Nanobubbles are gas-filled bubbles in water with typical diameters in the ~100 nm range. Nanobubbles in bulk aqueous solution have only recently come under focused scientific investigation, and this work has already triggered considerable interest and excitement. While many questions remain regarding bulk nanobubbles, they possess several consistently reported features, most notably being stable in water over long periods (e.g. months). It has been established that nanobubbles can dramatically enhance the total amount of gas present in water (e.g. values of >20-fold have been reported), and hence they can act as buffers that push the limits of gas solubility. Their very small size results in nanobubbles having very large surface area to volume ratios (affording extremely high gas transfer rates) and negligible buoyancy.Nanobubbles have potential for tremendous impact across a wide range of application areas that rely on gases dissolved in water, ranging from water treatment and environmental applications to energy innovation and food production. For example, air/oxygen nanobubbles can increase the supply of oxygen in wastewater biological treatment, and therefore decrease the amount of energy required for aeration (currently 55-70% of the total) thereby significantly reducing the overall energy consumption in wastewater treatment.A major limitation that has restricted the use of nanobubbles to this point has been challenges with their efficient generation, e.g. high-energy costs, modest concentrations and lack of scalability. This research project will build upon a recently published revolutionary technology where electric fields are used to catalyze nanobubble generation. This novel approach requires ~1000-fold less energy compared to current methods, thereby overcoming the crucial limitation that has thus far restricted the potential impacts and widespread application of nanobubbles. This project will focus on developing this breakthrough technology from a research concept to a functioning laboratory prototype generator, featuring an energy-efficient, continuous-flow, multistage, scalable design.

纳米气泡是水中充满气体的气泡，典型直径在 ~100 nm 范围内。散装水溶液中的纳米气泡最近才受到集中的科学研究，这项工作已经引起了相当大的兴趣和兴奋。虽然关于块状纳米气泡仍然存在许多问题，但它们具有几个一致报道的特征，最显着的是在水中长期（例如几个月）保持稳定。已经确定，纳米气泡可以显着增加水中存在的气体总量（例如，据报道，其值> 20倍），因此它们可以充当缓冲剂，推动气体溶解度的极限。它们的尺寸非常小，导致纳米气泡具有非常大的表面积与体积比（提供极高的气体传输速率）和可忽略不计的浮力。纳米气泡在依赖于溶解在水中的气体的广泛应用领域具有巨大的影响力，从水处理和环境应用到能源创新和粮食生产。例如，空气/氧气纳米气泡可以增加废水生物处理中的氧气供应，从而减少曝气所需的能量（目前占总量的55-70%），从而显着降低废水处理的总体能耗。迄今为止限制纳米气泡使用的主要限制是其高效生成的挑战，例如能源成本高、集中度低且缺乏可扩展性。该研究项目将建立在最近发表的一项革命性技术的基础上，该技术利用电场来催化纳米气泡的产生。与现有方法相比，这种新颖方法所需的能量减少了约 1000 倍，从而克服了迄今为止限制纳米气泡潜在影响和广泛应用的关键限制。该项目将重点开发这一突破性技术，从研究概念发展为功能齐全的实验室原型发电机，具有节能、连续流、多级、可扩展的设计。