Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Comparative Evaluation on Collision and Particle Separation Efficiency between CO2 Bubbles and Air Bubbles Using Contact Zone Model of Flotation Process

부상분리 공정의 접촉영역 모델을 이용한 이산화탄소와 공기 기포의 충돌 및 입자 분리효율 비교 평가

  • 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)
  • 양종원 (전북대학교 생리활성소재과학과) ;
  • 최용호 (전북대학교 생리활성소재과학과) ;
  • 채인석 (전북대학교 생리활성소재과학과) ;
  • 김미숙 (목포대학교 환경공학과) ;
  • 정용훈 (전북대학교 정읍산학연협력지원센터) ;
  • 김태금 (전북대학교 정읍산학연협력지원센터) ;
  • 곽동희 (전북대학교 생리활성소재과학과)
  • Received : 2018.11.25
  • Accepted : 2019.01.24
  • Published : 2019.01.30
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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

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Fig. 1. Schematic diagram of lab-scale device for flotation experiments.

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Fig. 2. Single-collector collision efficiency depending on floc size.

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Fig. 3. Variation of SCC efficiency in terms of floc size for bubble size range 10 ~ 100 μm.

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Fig. 4. Variation of SCC efficiency in terms of floc size for DAF, DCF and DCFS.

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Fig. 5. Particle separation efficiency (X) in terms of contact time.

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Fig. 6. Comparison of particle separation efficiency between predicted values and observed values under the contact time, 600 sec.

Table 1. Dimension of the DAF and DCF pilot plant and equipment

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Table 2. Simulation parameters for contact zone model

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