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Article

Numerical Investigation on the Dynamic Flow Pattern in a New Wastewater Treatment System

by 1,2, 1,2, 3, 1,2,*, 1,2 and 1,2
1
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Ministry of Education, Changsha 410083, China
2
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
3
Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding 071051, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jiangyong Hu
Water 2021, 13(8), 1101; https://doi.org/10.3390/w13081101
Received: 31 March 2021 / Revised: 9 April 2021 / Accepted: 13 April 2021 / Published: 16 April 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Currently, industries seek to optimize the development of technology from energy-saving, economic, and environmental perspectives. Dissolved air flotation (DAF) is one of the most effective wastewater treatment systems. However, it requires considerable energy and causes significant operating costs. A recently emerged application of using fluidic oscillators (FOs) to generate microbubbles has attracted extensive attention, as it consumes much less energy and has proven to be a more energy-efficient technique. In this article, a microbubble generator based on FOs is introduced into the flotation tank, and an energy-saving water treatment system, namely fluidic air flotation (FAF), is presented. Using the computational fluid dynamics (CFD) method, the flow pattern of the FAF is investigated. It is observed that FAF generates a dynamic flow pattern, which is beneficial for bubble removal. At the upper part of the separation zone, the flow pattern exhibits a wavy shape. The flow pattern at the lower part switches between clockwise and counterclockwise. The air distribution of the separation zone is also studied. It is found that the height of the “white water” zone almost linearly decreases with the increase in bubble diameter and diffuser size. FAF consumes almost no energy and occupies a small area, and it is expected to provide a promising solution to develop a new generation of the wastewater treatment system. View Full-Text
Keywords: computational fluid dynamics; Euler–Euler; fluidic oscillators; microbubble; water treatment computational fluid dynamics; Euler–Euler; fluidic oscillators; microbubble; water treatment
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MDPI and ACS Style

Tang, L.; Zhang, S.; Li, M.; Zhang, X.; Wu, Z.; Ma, L. Numerical Investigation on the Dynamic Flow Pattern in a New Wastewater Treatment System. Water 2021, 13, 1101. https://doi.org/10.3390/w13081101

AMA Style

Tang L, Zhang S, Li M, Zhang X, Wu Z, Ma L. Numerical Investigation on the Dynamic Flow Pattern in a New Wastewater Treatment System. Water. 2021; 13(8):1101. https://doi.org/10.3390/w13081101

Chicago/Turabian Style

Tang, Lubo; Zhang, Shaohe; Li, Meng; Zhang, Xinxin; Wu, Zhanghui; Ma, Like. 2021. "Numerical Investigation on the Dynamic Flow Pattern in a New Wastewater Treatment System" Water 13, no. 8: 1101. https://doi.org/10.3390/w13081101

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