Acoustically activated trapping for colloidal filtration: a multiscale experimental investigation using laser-based optical diagnostics
用于胶体过滤的声激活捕获:使用基于激光的光学诊断的多尺度实验研究
基本信息
- 批准号:2236466
- 负责人:
- 金额:$ 32.03万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2023
- 资助国家:美国
- 起止时间:2023-08-01 至 2026-07-31
- 项目状态:未结题
- 来源:
- 关键词:
项目摘要
Colloidal filtration is widely used in water and wastewater treatment to remove solid, microscopic particles (known as colloids) including inorganic particles, bacteria, and other aggregates present in drinking water sources and wastewater. This process uses pressure to drive a colloid-bearing fluid (e.g., contaminated water) through a microfiltration/ultrafiltration membrane that consists of a series of microscopic channels that allows the fluid to pass through but blocks the passage of colloids. Over time, the channels become clogged with colloids until the pressure required to drive the fluid through the membrane becomes too great and the membrane must be replaced. Membrane replacement costs represent 50% of the total operational cost of a filtration system. The expense required to operate membrane-type filters is a significant contribution to water access inequality. To address these challenges, the Principal Investigators (PIs) of this project propose to explore the use of acoustic waves (sound) as a to break up clogs and capture colloids before they reach the membrane interface with the goal of extending the operational lifetime of the membrane and reduce the overall operating costs. The successful completion of this project will benefit society through the generation of fundamental knowledge on membrane fouling and a potential reduction in operating costs which could increase access to clean water in rural areas or communities with inadequate infrastructure. Additional benefits to society will be achieved through student education and training including the mentoring of one graduate student at Iowa State University (ISU). Membranes are used in a wide variety of applications to separate solid particles (colloids) from water and waste streams. Fouling during colloidal filtration processes results from the build-up of colloidal particles at a membrane interface, forming what is known as a cake layer. The pressure required to drive fluid through a cake layer increases with time, thus requiring a significant increase in pumping power input. The overarching goal of this proposal is to develop experimentally validated 2D and 3D models of cake layer formation and break-up at membrane interfaces due to acoustic field interactions. To advance this goal, the Principal Investigators (PIs) propose to test the hypothesis that the application of an acoustic field generates a body force at the membrane interface that modifies the particle distribution within the cake layer. The specific research objectives are to (1) measure cake layer growth without an acoustic field to understand membrane surface forces; (2) investigate and model acoustic field interactions with the membrane; and (3) optically interrogate acoustic mixing in 3D membranes. The successful completion of this research has the potential for transformative impact through the generation of fundamental knowledge of interfacial phenomena related to external, acoustic field-actuated formation of cake layers in membranes. To implement the education and training goals of the project, the PIs plan to engage with the ISU chapter of the Society of Hispanic Professional Engineers (SHPE) and the Academic Program for Excellence (APEX) program to develop and deliver learning experiences to high school and undergraduate students underrepresented in STEM. In addition, the PIs plan to leverage existing programs at ISU, such as the Women in Science and Engineering program to introduce, recruit, and mentor women in science and engineering.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
胶体过滤广泛用于水和废水处理以去除固体、微观颗粒(称为胶体),包括存在于饮用水源和废水中的无机颗粒、细菌和其他聚集体。该过程使用压力来驱动含胶体流体(例如,污染的水)通过微滤/超滤膜,该微滤/超滤膜由一系列允许流体通过但阻止胶体通过的微观通道组成。随着时间的推移,通道被胶体堵塞,直到驱动流体通过膜所需的压力变得太大,必须更换膜。膜更换成本占过滤系统总运行成本的50%。运行膜式过滤器所需的费用是造成用水不平等的一个重要因素。为了应对这些挑战,该项目的主要研究者(PI)建议探索使用声波(声音)作为一种方法来打破堵塞并在胶体到达膜界面之前捕获胶体,以延长膜的使用寿命并降低整体运营成本。该项目的成功完成将通过产生关于膜污染的基本知识和潜在的运营成本降低而造福社会,这可能会增加农村地区或基础设施不足的社区获得清洁水的机会。通过学生教育和培训,包括指导爱荷华州州立大学(ISU)的一名研究生,将为社会带来额外的好处。膜在各种各样的应用中用于从水和废水流中分离固体颗粒(胶体)。胶体过滤过程中的结垢是由于胶体颗粒在膜界面处的积聚,形成所谓的滤饼层。驱动流体通过滤饼层所需的压力随时间增加,因此需要显著增加泵送功率输入。该提案的首要目标是开发实验验证的2D和3D模型的滤饼层的形成和分解,由于声场相互作用在膜界面。为了推进这一目标,主要研究者(PI)建议测试以下假设:声场的应用在膜界面处产生体积力,该体积力修改滤饼层内的颗粒分布。具体的研究目标是:(1)在没有声场的情况下测量滤饼层的生长,以了解膜表面力;(2)研究声场与膜的相互作用并建模;(3)光学询问3D膜中的声混合。这项研究的成功完成有可能通过生成与外部声场驱动的膜中滤饼层形成相关的界面现象的基础知识,产生变革性的影响。为了实现该项目的教育和培训目标,PI计划与西班牙裔专业工程师协会(SHPE)和卓越学术计划(APEX)计划的ISU分会合作,为STEM中代表性不足的高中和本科生开发和提供学习经验。此外,PI计划利用ISU现有的计划,如妇女在科学和工程计划,介绍,招聘和指导妇女在科学和工程。这个奖项反映了NSF的法定使命,并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Jaime Juarez其他文献
Jaime Juarez的其他文献
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Multiscale Mechanics of Composite Hydrogels Exposed to Shock Waves
复合水凝胶暴露于冲击波的多尺度力学
- 批准号:
2114565 - 财政年份:2021
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$ 32.03万 - 项目类别:
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2050105 - 财政年份:2021
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$ 32.03万 - 项目类别:
Standard Grant
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