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http://dx.doi.org/10.15681/KSWE.2019.35.1.64

Comparative Evaluation on Collision and Particle Separation Efficiency between CO2 Bubbles and Air Bubbles Using Contact Zone Model of Flotation Process  

Yang, Jong-Won (Dept. of Physically Active Material Science, Chonbuk National University)
Choi, Yong-Ho (Dept. of Physically Active Material Science, Chonbuk National University)
Chae, In-Seok (Dept. of Physically Active Material Science, Chonbuk National University)
Kim, Mi-Sug (Dept. of Environmental Engineering, Mokpo National University)
Jeong, Yong-Hoon (Center for Jeongeup Industry-Academy-Institute Cooperation, Chonbuk National University)
Kim, Tae-Geum (Center for Jeongeup Industry-Academy-Institute Cooperation, Chonbuk National University)
Kwak, Dong-Heui (Dept. of Physically Active Material Science, Chonbuk National University)
Publication Information
Journal of Korean Society on Water Environment / v.35, no.1, 2019 , pp. 64-71 More about this Journal
Abstract
In recent years, carbon dioxide ($CO_2$) bubbles emerged as the most widely applied material with the recycling of sequestrated storage to decrease global warming. Flotation using $CO_2$ as an alternative to air could be effective in overcoming the high power consumption in the dissolved air flotation (DAF) process. The comparison of DAF and DCF system indicated that, the carbon dioxide flotation (DCF) system with pressurized $CO_2$ only requires 1.5 ~ 2.0 atm, while the DAF system requires 3.0 ~ 6.0 atm. In a bid to understand the characteristics of particle separation, the single collector collision (SCC) model was used and a series of simulations were conducted to compare the differences of collision and flotation between $CO_2$ bubbles and air bubbles. In addition, laboratory experiments were sequentially done to verify the simulation results of the SCC model. Based on the simulation results, surfactant injection, which is known to decrease bubble size, cloud improved the collision efficiency of $CO_2$ bubbles similar to that of air bubbles. Furthermore, the results of the flotation experiments showed similar results with the simulation of the SCC model under anionic surfactant injection. The findings led us to conclude that $CO_2$ bubbles can be an alternative to air bubbles and a promising material as a collector to separate particles in the water and wastewater.
Keywords
Bubble; Carbon dioxide; Collision; Dissolved air flotation; Flotation;
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Times Cited By KSCI : 1  (Citation Analysis)
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