Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Advanced Water Treatment of High Turbidity Source by Hybrid Process of Ceramic Ultrafiltration and Photocatalyst: 3. Effect of Organic Matters at $N_2$ Back-flushing

세라믹 한외여과 및 광촉매 혼성공정에 의한 고탁도 원수의 고도정수처리: 3. 질소 역세척 시 유기물의 영향

  • Park, Jin Yong (Dept. of Environmental Sciences & Biotechnology, Hallym University) ;
  • Han, Ji Soo (Dept. of Environmental Sciences & Biotechnology, Hallym University)
  • 박진용 (한림대학교 환경생명공학과) ;
  • 한지수 (한림대학교 환경생명공학과)
  • Received : 2012.05.23
  • Accepted : 2012.06.19
  • Published : 2012.06.29
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Abstract

Effect of humic acid (HA), photo-oxidation and adsorption with periodic $N_2$ back-flushing was investigated in hybrid process of ceramic ultrafiltration and photocatalyst for drinking water treatment. It was compared and investigated with the previous result at water back-flushing in viewpoints of membrane fouling resistance ($R_f$), permeate flux (J), and total permeate volume ($V_T$). As decreasing HA, $R_f$ decreased dramatically and J increased, and finally $V_T$ was the highest at HA 2 mg/L. As HA concentration increased from 2 to 10 mg/L, the membrane fouling resistance after 180 mins' operation ($R_{f,180}$) improved 0.8 times more than that of water back-flushing. Therefore, HA concentration should affect on the membrane fouling at $N_2$ back-flushing than water back-flushing. Turbidity treatment efficiencies were almost constant independent of HA concentration, but HA treatment efficiency was the maximum at HA 2 mg/L. This means that adsorption and photo-oxidation of photocatalyst beads could removed HA at HA 2 mg/L, but it was not enough at 4 mg/L. Beyond HA 6 mg/L, UF could effectively treat HA by thick cake layer on membrane surface and severe inner membrane fouling.

정수처리용 세라믹 한외여과 및 광촉매의 혼성공정에서 주기적 질소 역세척 시 휴믹산 농도의 영향을 알아보고, 막오염에 의한 저항($R_f$) 및 투과선속(J), 총여과부피($V_T$) 측면에서 물 역세척의 기존 결과와 비교 고찰하였다. 휴믹산 농도가 낮아질수록 $R_f$는 급격히 감소하고 J는 증가하여, 휴믹산 농도 2 mg/L에서 $V_T$는 가장 높았다. 휴믹산 농도가 2에서 10 mg/L로 높아졌을 때, 180분 운전 후 막오염 저항($R_{f,180}$)은 물 역세척 시 $R_{f,180}$값보다 0.8배 더 증가하였다. 따라서 물 역세척보다 질소 역세척 시 막오염이 휴믹산 농도의 영향을 더 크게 받는다는 것을 알 수 있었다. 탁도 처리효율은 휴믹산 농도와 무관하게 거의 일정하였으나, 휴믹산 처리효율은 휴믹산 2 mg/L에서 최대였다. 이것은 질소 역세척 시 휴믹산 2 mg/L에서 광촉매 구의 흡착과 광산화로 휴믹산이 가장 효과적으로 제거되지만, 4 mg/L에서는 광촉매 구만으로 역부족인 것으로 판단된다. 휴믹산 6 mg/L 이상에서는 막표면의 두꺼운 케이크 층과 심화된 내부 막오염으로, 휴믹산이 한외여과막에 의해 효과적으로 제거된 것이다.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

  1. H. Zhang, X. Quan, S. Chen, H. Zhao, and Y. Zhao, "Fabrication of photocatalytic membrane and evaluation its efficiency in removal of organic pollutants from water", Sep. Pur. Tech., 50, 147 (2006). https://doi.org/10.1016/j.seppur.2005.11.018
  2. H. Yamashita, H. Nakao, M. Takeuchi, Y. Nakatani, and M. Anpo, "Coating of $TiO_2$ photocatalysts on super-hydrophobic porous teflon membrane by an ion assisted depositionmethod and their selfcleaning performanc", Nucl. Instr. Meth. Phys. Res., 206, 898 (2003).
  3. K. W. Park, K. H. Choo, and M. H. Kim, "Use of a combined photocatalysis/microfiltration system for natural organic matter removal", Membrane Journal, 14, 149 (2004).
  4. H. C. Oh, "Photocatalytic degradation characteristics of organic matter by highly pure $TiO_2$ nanocrystals", Master Dissertation, Kangwon National Univ., Chuncheon, Korea (2006).
  5. J. U. Kim, "A study on drinking water treatment by using ceramic membrane filtration", Master Dissertation, Yeungnam Univ., Daegu, Korea (2004).
  6. C. K. Choi, "Membrane technology", Chem. Ind. & Tech., 3, 264 (1985).
  7. R. Molinari, F. Pirillo, M. Falco, V. Loddo, and L. Palmisano, "Photocatalytic degradation of dyes by using a membrane reactor", Chem. Eng. Proc., 43, 1103 (2004). https://doi.org/10.1016/j.cep.2004.01.008
  8. T. H. Bae and T. M. Tak, "Effect of $TiO_2$ nanoparticles on fouling mitigation of ultrafiltration membranes for activated sludge filtration", J. Membr. Sci., 249, 1 (2005). https://doi.org/10.1016/j.memsci.2004.09.008
  9. G. S. Cong and J. Y. Park, "Advanced water treatment of high turbidity source by hybrid process of ceramic ultrafiltration and photocatalyst: 1. effects of photocatalyst and water-back-flushing condition", Membrane Journal, 21, 127 (2011).
  10. G. S. Cong and J. Y. Park, "Advanced water treatment of high turbidity source by hybrid process of ceramic ultrafiltration and photocatalyst: 2. effect of photo-oxidation and adsorption", Membrane Journal, 21, 201 (2011).
  11. S. G. Kang and J. Y. Park, "Micellar enhanced ceramic microfiltration for removal of aqueous ferrous ion: effect of surfactant concentration and $N_2$-backflushing", Membrane Journal, 19, 136 (2009).
  12. H. C. Lee, J. H. Cho, and J. Y. Park, "Effect of water-back-flushing time and period in advanced water treatment system by ceramic microfiltration", Membrane Journal, 18, 26 (2008).
  13. M. Cheryan, "Ultrafiltration handbook", Technomic Pub. Co., Lancater, PA (1984).
  14. J. Y. Park and G. S. Lee, "Advanced water treatment of high turbidity source by hybrid process of photocatalyst and ceramic microfiltration : effect of organic materials in water-back-flushing", Membrane Journal, 21, 72 (2011).