Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
권호 표지
DOI QR코드

DOI QR Code

PEI Hollow Fiber Membranes Modified with Fluorinated Silica Nanoparticles for the Recovery of Biogas from Anaerobic Effluents

불화 실리카로 개질된 폴리에테르이미드 중공사막을 이용한 혐기성 유출수로부터 바이오가스 회수

  • Yun, Kang Hee (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology) ;
  • Wongchitphimon, Sunee (Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University) ;
  • Bae, Tae-hyun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
  • 윤강희 (한국과학기술원 생명화학공학과(CBE)) ;
  • 수니 웡치피몬 (난양이공대 싱가포르 분리막센터) ;
  • 배태현 (한국과학기술원 생명화학공학과(CBE))
  • Received : 2020.10.14
  • Accepted : 2020.10.22
  • Published : 2020.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, polymer-fluorinated silica composite hollow fiber membranes were fabricated and applied to a membrane contactor for the recovery of methane dissolved in the anaerobic effluent. To prepare the composite membranes, porous hollow fiber substrates were fabricated with Ultem®, a commercial polyetherimide (PEI). Subsequently, fluorinated silica particles were synthesized and coated on the surface via strong covalent bonding. Due to the high porosity, our membrane showed a CH4 flux of 8.25 × 10-5 ㎤ (STP)/㎠·s at the liquid velocity of 0.03 m/s which is much higher that that of commercial polypropylene membrane designed for degassing processes. This is attributed to our membrane's high porosity as well as a superior surface hydrophobicity (120~122°) resulted from the coating with fluorinated silica nanoparticles.

본 연구에서는, 혐기성 처리수에 용해된 바이오가스의 회수를 위해 불화 실리카/고분자 중공사 복합막을 제조하고 막접촉기에서의 성능을 평가하였다. 복합막은 상용 폴리에테르이미드인(PEI) Ultem®을 이용하여 만든 중공사막 표면에 불화 실리카를 강력한 공유 결합을 통해 코팅하는 방법으로 제조되었다. 막접촉기는 바이오가스로 포화된 수용액을 중공사의 외부에 공급하고, 중공사 내부로 기체를 투과시키는 방법으로 운전하였다. 높은 공극률을 가진 중공사막(PEI-fSiO2-A)은 액상 속도가 0.03 m/s일 때 메탄 회수 유량이 8.25 × 10-5 ㎤ (STP)/㎠·s에 달했고 불화 실리카에 의해 표면 소수성이 매우 높아져 물과의 접촉각이 75.6°에서 120~122°로 향상되었다. 본 연구에서 제조된 복합막은 바이오가스의 투과 속도와 소수성 모두에서 탈기용으로 제조된 상용 폴리프로필렌 막보다 우수한 성능을 나타냈다.

Keywords

References

  1. G. Lofrano and J. Brown, "Wastewater management through the ages: A history of mankind", Sci. Total. Environ., 408(22), 5254 (2010). https://doi.org/10.1016/j.scitotenv.2010.07.062
  2. Y. J. Chan, M. F. Chong, C. L. Law, and D. G. Hassell, "A review on anaerobic-aerobic treatment of industrial and municipal wastewater", Chem. Eng. Journal., 155(1-2), 1 (2009). https://doi.org/10.1016/j.cej.2009.06.041
  3. Z.-h. Liu, H. Yin, Z. Dang, and Y. Liu, "Dissolved methane: A hurdle for anaerobic treatment of municipal wastewater", Environ. Sci. Technol., 48 (2), 889 (2014). https://doi.org/10.1021/es405553j
  4. B. C. Crone, J. L. Garland, G. A. Sorial, and L. M. Vane, "Significance of dissolved methane in effluents of anaerobically treated low strength wastewater and potential for recovery as an energy product: A review", Water. Res., 104, 520 (2016). https://doi.org/10.1016/j.watres.2016.08.019
  5. H. M. Kvamsdal, J. P. Jakobsen, and K. A. Hoff, "Dynamic modeling and simulation of a $CO_2$ absorber column for post-combustion $CO_2$ capture", Chem. Eng. Proc: Proc. Intensif., 48(1), 135 (2009). https://doi.org/10.1016/j.cep.2008.03.002
  6. W. Rongwong, K. Goh, and T. H. Bae, "Energy analysis and optimization of hollow fiber membrane contactors for recovery of dissolved methane from anaerobic effluent", J. Membr. Sci., 554, 184 (2018). https://doi.org/10.1016/j.memsci.2018.03.002
  7. W. Rongwong, J. Lee, K. Goh, H. E. Karahan, and T. H. Bae, "Membrane-based technologies for the post-treatment of anaerobic effluents: Current status and new opportunities", npj Clean Water, 1, 21 (2018). https://doi.org/10.1038/s41545-018-0021-y
  8. G. S. M. D. P. Sethunga, J. Lee, R. Wang, and T. H. Bae, "The influence of membrane characteristics and operating parameters on the performance of a membrane contactor for recovering dissolved methane from anaerobic effluents", J. Membr. Sci., 589, 117263 (2019). https://doi.org/10.1016/j.memsci.2019.117263
  9. G. S. M. D. P. Sethunga, J. Lee, R. Wang, and T. H. Bae, "Influences of operating parameters and membrane characteristics on the net energy production in hollow fiber membrane contactors for dissolved biomethane recovery", J. Membr. Sci., 610, 118301 (2020). https://doi.org/10.1016/j.memsci.2020.118301
  10. M. J. Kim, B. K. Seo, Y. I. Park, K. S. Lee, and K. H. Lee, "Trends in membrane contactors", Membr. J., 15(3), 187 (2005)
  11. A. Gabelman and S.-T. Hwang, "Hollow fiber membrane contactors", J. Membr. Sci., 159(1-2), 61 (1999). https://doi.org/10.1016/S0376-7388(98)00331-7
  12. Y. Xu, K. Goh, R. Wang, and T. H. Bae, "A review on polymer-based membranes for gas-liquid membrane contacting processes: Current challenges and future direction", Sep. Purif. Technol., 229, 115791 (2019). https://doi.org/10.1016/j.seppur.2019.115791
  13. G. S. M. D. P. Sethunga, W. Rongwong, R. Wang, and T. H. Bae, "Optimization of hydrophobic modification parameters of microporous polyvinylidene fluoride hollow fiber membrane for biogas recovery from anaerobic membrane bioreactor effluent", J. Membr. Sci., 548, 510 (2018). https://doi.org/10.1016/j.memsci.2017.11.059
  14. G. S. M. D. P. Sethunga, H. E. Karahan, R. Wang, and T. H. Bae, "PDMS-coated porous PVDF hollow fiber membranes for efficient recovery of dissolved biomethane from anaerobic effluents", J. Membr. Sci., 584, 333 (2019). https://doi.org/10.1016/j.memsci.2019.05.016
  15. Y. Lin, Y. Xu, C. H. Loh, and R. Wang, "Development of robust fluorinated $TiO_2$/PVDF composite hollow fiber membrane for $CO_2$ capture in gas-liquid membrane contactor", Appl. Surf. Sci., 436, 670 (2018). https://doi.org/10.1016/j.apsusc.2017.11.263
  16. Y. Zhang and R. Wang, "Novel method for incorporating hydrophobic silica nanoparticles on polyetherimide hollow fiber membranes for $CO_2$ absorption in a gas-liquid membrane contactor", J. Membr. Sci., 452, 379 (2014). https://doi.org/10.1016/j.memsci.2013.10.011
  17. S. Wongchitphimon, W. Rongwong, C. Y. Chuah, R. wang, and T. H. Bae, "Polymer-fluorinated silica composite hollow fiber membranes for the recovery of biogas dissolved in anaerobic effluent", J. Membr. Sci., 540, 146 (2017). https://doi.org/10.1016/j.memsci.2017.06.050
  18. Y. Zhang and R. Wang, "Fabrication of novel polyetherimide-fluorinated silica organic-inorganic composite hollow fiber membranes intended for membrane contactor application", J. Membr. Sci., 443, 170 (2013). https://doi.org/10.1016/j.memsci.2013.04.062