Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Permeate Flux Analysis of Direct Contact Membrane Distillation (DCMD) and Sweep Gas Membrane Distillation (SGMD)

직접접촉식과 동반기체식 막증류 공정의 투과수 변화에 따른 비교해석

  • Eum, Su-Hwan (Department of Chemical Engineering, College of Engineering, Kyung Hee University) ;
  • Kim, Albert S. (Department of Chemical Engineering, College of Engineering, Kyung Hee University) ;
  • Lee, Yong-Taek (Department of Chemical Engineering, College of Engineering, Kyung Hee University)
  • 엄수환 (경희대학교 공과대학 화학공학과) ;
  • ;
  • 이용택 (경희대학교 공과대학 화학공학과)
  • Received : 2011.06.21
  • Accepted : 2011.09.21
  • Published : 2011.09.30
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Abstract

In this study, we used prepared a cylindrical module consisting 100 hollow fibers of commercialized (hydrophobic) polyethylene membrane of $0.4{\mu}m$ pore size and systematically studied performance of direct contact membrane distillation (DCMD) and sweep gas membrane distillation (SGMD) in terms of variation of permeate flux and salt rejection with respect to temperature drop across the membrane, salt concentrations in feed, and flow rates of cooling water and sweep gas. SGMD was regarded as DCMD with a sweep gas layer between permeate-side membrane surface and cooling water. Sweep gas flow decreases the permeate flux from that of DCMD by providing an additional gas-layer resistance. We compared DCMD and SGMD performance by using mass balance with a fitting parameter (${\omega}$), indicating fraction of permeate flow rate.

본 연구에서는 기공의 크기가 $0.4{\mu}m$의 소수성 막인 폴리에틸렌 100가닥으로 모듈을 제작하여 직접접촉식과 동반기체식 막증류 과정에서 막의 양단의 온도차, 공급수의 염분농도, 그리고 냉각수/동반기체의 유량에 대해서 투과수의 플럭스를 측정하였다. 이론적으로는, 동반기체식 막증류는 직접접촉식 막증류 공정의 막의 투과측 표면과 냉각수 사이에 동반 기체층이 추가된 것으로 간주하였다. 이 동반기체층은 새로운 저항층과과 동반기체의 이동중 상변화된 수증기가 손실되는 것이 투과유속을 30% 정도 감소시키게 된다. 물질수지식을 이용하여, 기존의 식과는 다르게 보정계수(${\omega}$)를 넣어 직접접촉식 막증류와 동반기체식 막증류의 이론값을 실험값과 비교 분석하였다.

Keywords

References

  1. H. W. Cho and W. C. Shin, "The prospect of membrane distillation", Membrane Journal, 7(2), 57 (1997).
  2. I. C. Escobar and A. I. Shafter (Eds.), "Sustainable Water for the Future: Water Recycling versus Desalination", Sus. Sci. and Eng., 2, 416 (2010).
  3. E. Curcio and E. Drioli. "Membrane Distillation and Related Operations-A Review". Sep. and Puri. Rev., 34(1), 35 (2005). https://doi.org/10.1081/SPM-200054951
  4. M. H. Sharqawy, J. H. L. V, and S. M. Zubair, "Thermophysical properties of seawater: a review of existing correlations and data", Des. and Wat. Treat., 16, 354-380 (2010). https://doi.org/10.5004/dwt.2010.1079
  5. K. Y. Chung, "Membrane distillation of the aqueous glucose solution", Membrane Journal , 10(4), 230 (2000).
  6. M. Khayet, "Membranes and theoretical modeling of membrane distillation: Areview", Adv. in Colloid Interface Sci., 164(1-2), 56-88 (2011). https://doi.org/10.1016/j.cis.2010.09.005
  7. M. Khayet, M. P. Godino, and J. I. Mengual, "Theoretical and experimental studies on desealination using the sweeping gas membrane distillation method", Desalination, 157, 297 (2003). https://doi.org/10.1016/S0011-9164(03)00409-0
  8. M. S. Chun and H. W. Kwak, "Study on hindered diffusion of single polyelectrolyte chain in micro- pores by employing Brownian dynamics simulations", Membrane Journal , 12, 207 (2002).
  9. S. H. Suh, W. K. Min, and S. C. Kim, "Molecular simulation studies for Knudsen diffusion in the overlapping sphere pore model", J. Kor. Ind. Chem. Eng., 37, 557 (1999).
  10. T. Y. Cath, V. D. Adams, and A. E. Childress, "Experimental study of desalination using direct contact membrane distillation: a new approach to flux enhancement", J. Membr. Sci., 228, 10 (2004).
  11. D. K. Chang and Y. T. Lee, "Humidification characterization of water to gas membrane humidifier for polymer electrolyte membrane fuel cell", Membrane Journal , 20(4), 326-334 (2010).
  12. F. Macedonio and E. Drioli, "Membrane engineering progresses in desalination and water reuse", Memb. Wat. Treat., 1, 75 (2010).
  13. V. Calabro, G. Pantano, M. Kanga, R. Molinari, and E. Driolia, "Experimental study on integrated membrane processes in the treatment of solutions simulating textile effluents. Energy and energy analysis", Desalination, 78, 257 (1990). https://doi.org/10.1016/0011-9164(90)80046-E
  14. K. W. Lawson and D. R. Lloyd, "membrane distillation", J. Membr. Sci., 124, 1 (1997). https://doi.org/10.1016/S0376-7388(96)00236-0
  15. H. J. Hwanga, K. Hea, S. Grayb, J. Zhangb, and I. S. Moona, "Direct contact membrane distillation (DCMD): Experimental study on the commercial PTFE membrane and modeling", J. Membr. Sci., 371, 90 (2011). https://doi.org/10.1016/j.memsci.2011.01.020