Affiliation:
1. Machining Technology for Lightweight Materials, Department for Lightweight Construction Technologies, Fraunhofer Institute for Manufacturing Engineering and Automation IPA, Nobelstraße 12, 70569 Stuttgart, Germany
Abstract
When a suspension passes through a high-frequency standing sound wave, the particles it contains are manipulated by acoustic forces. In a one-dimensional sound field, these forces lead to a planar arrangement of the particles and the formation of agglomerates. It is known that the combination of these forces and depth filtration can be utilized to significantly increase the filter efficiency of coarse-pored media. So far, this concept has only been used in microfluidics. In this paper, we present the results of a scaled-up filtration channel to test the viability of the industrial application of acoustically assisted filtration systems for the removal of microparticles. The influences of acoustic power input, flow rate, and the porosity of the filter media are investigated. In addition to verifying the scalability, a significant decrease in the large particle fraction in the outflow of the channel was observed when a high-power sound field is applied. Furthermore, the formed agglomerates tend to rise to the fluid surface. The floating particles mostly consist of a large particle fraction.
Subject
Filtration and Separation,Analytical Chemistry
Reference15 articles.
1. Microplastics removal in wastewater treatment plants: A critical review;Iyare;Environ. Sci. Water Res. Technol.,2020
2. Galgani, F., Fleet, D., Van Franeker, J., Katsanevakis, S., Maes, T., Mouat, J., Oosterbaan, L., Poitou, I., Hanke, G., and Thompson, R. (2010). Marine Strategy Framework Directiv—Task Group 10 Report: Marine Litter, Publications Office of the European Union.
3. Global distribution of microplastics and its impact on marine environment—A review;Ajith;Environ. Sci. Pollut. Res.,2020
4. Filtermaterialien für die FVK-Nasszerspanung/Filter materials for FRP machining—Retention rate for filter materials during the wet machining of fiber-reinforced plastics;Kleinhenz;Werkstattstech. Online,2021
5. Reuse, treatment, and discharge of the concentrate of pressure-driven membrane processes;Lejon;Environ. Sci. Technol.,2003