| Title |
Comparative Evaluation on Collision and Particle Separation Efficiency between CO2 Bubbles and Air Bubbles Using Contact Zone Model of Flotation Process |
| Authors |
양종원 ( Yang Jong-won ) ; 최용호 ( Choi Yong-ho ) ; 채인석 ( Chae In-seok ) ; 김미숙 ( Kim Mi-sug ) ; 정용훈 ( Jeong Yong-hoon ) ; 김태금 ( Kim Tae-geum ) ; 곽동희 ( Kwak Dong-heui ) |
| DOI |
https://doi.org/10.15681/KSWE.2019.35.1.64 |
| Keywords |
Bubble; Carbon dioxide; Collision; Dissolved air flotation; Flotation |
| Abstract |
In recent years, carbon dioxide (CO2) bubbles emerged as the most widely applied material with the recycling of sequestrated storage to decrease global warming. Flotation using CO2 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 CO2 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 CO2 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 CO2 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 CO2 bubbles can be an alternative to air bubbles and a promising material as a collector to separate particles in the water and wastewater. |