Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Effect of operating condition of electro-coagulation on the membrane filtration resistances of activated sludge

전기응집 조건이 활성슬러지 막 여과 저항에 미치는 영향

  • 홍성준 (호서대학교 나노바이오트로닉스학과) ;
  • 장인성 (호서대학교 나노바이오트로닉스학과)
  • Received : 2015.01.06
  • Accepted : 2015.03.12
  • Published : 2015.03.31
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Abstract

MBR (Membrane Bio-Reactor) process is known to consume enormous energy to control membrane fouling. To solve this problem, electro-coagulation technique has been applied to MBR. A series of electro-coagulation was applied to activated sludge suspension under different current density condition. After the electro-coagulations, membrane filtration of the activated sludge suspensions was conducted to investigate the effect of electro-coagulation on the fouling. As current density increased 10 to 40A/m2, the total fouling resistance (Rc+Rf) decreased from 18 to 79%, showing that the electro-coagulation improved the membrane filtration efficiency. Both the organic concentration in bulk and the particles size distribution were not nearly changed before and after the electro-coagulation. The enhanced filtration efficiency might be due to the aluminum hydroxide generated from chemical precipitation, which can be acted as a dynamic membrane preventing a deposition of foulants on membrane surfaces.

MBR (Membrane Bio-Reactor) 공정은 막 오염을 해결하기 위해 막대한 에너지 소비를 하는 공정으로 알려져 있다. 이를 해결하기 위한 일환으로 전기응집 기술을 MBR에 적용하는 시도가 보고되고 있다. 본 연구에서는 전류밀도를 변화시켜가며 활성슬러지의 막 여과를 수행하여 전기응집이 막 오염 저감에 미치는 영향과 메커니즘을 파악하고자 하였다. 활성슬러지 혼합액을 전기응집한 후 회분식교반셀로 분리 막의 여과성능을 평가하였다. 전류밀도(A/m2)를 10에서 40으로 증가시켰을 때 총 오염 저항 (Rc+Rf) 값이 18%에서 79%까지 감소하여 전기응집으로 인해 분리 막의 여과성능이 향상됨을 확인할 수 있었다. 전기응집 전후로 유기물 농도와 활성슬러지 입도분포 변화는 거의 일어나지 않았다. 여과 성능의 향상은 수산화알루미늄, Al(OH)3이 생성되어 막 표면에 부착되면서 오염물질이 쌓이게 됨을 방지하는 역할, 즉 dynamic membrane 으로 작용하였기 때문인 것으로 판단되었다.

Keywords

References

  1. Simon Judd, "The status of membrane bioreactor technology", Trends in Biotechnology 26, pp.109-116, 2008 DOI: http://dx.doi.org/10.1016/j.tibtech.2007.11.005
  2. Fangang Meng, So-Ryong Chae, Anja Drews, Matthias Kraume, Hang-Sik Shin, Fenglin Yang, "Recent advances in membrane bioreactors(MBRs): Membrane fouling and membrane material", Water Research 43, pp.1489-1512, 2009 DOI: http://dx.doi.org/10.1016/j.watres.2008.12.044
  3. Anja Drews, "Membrane fouling in membrane bioreactors-Characterisation contradictions, cause and cures", Journal of Membrane Science 363, pp.1-28, 2010. DOI: http://dx.doi.org/10.1016/j.memsci.2010.06.046
  4. Jun-Young Kim, "Application of in-situ electro-coagulation (EC) for control of the membrane fouling in MBR(Membrane Bio-Reactor): Correlation between membrane fouling and microbial characteristics of activated sludge, Hoseo Univerity Ph.D thesis, 2011
  5. Khalid bani-melhem, Maria Elektorowicz, "Development of novel submerged membrane electro-bioreactor(SMBR): Performance for fouling reduction", Environ. Sci. Technol 44, pp.3298-3304, 2010. DOI: http://dx.doi.org/10.1021/es902145g
  6. Mohammad. M. Emamjomeh, Muttucumaru. Sivakumar, "Review of pollutants removed by electrocoagulation and electrocoagulation/flotation processes", Journal of Environmental Management 90, pp.1663-1679, 2009. DOI: http://dx.doi.org/10.1016/j.jenvman.2008.12.011
  7. Yunny Meas, Jose A. Ramirez, Mario A. Villalon, Thomas W. Chapman, "Industrial wastewaters treated by electrocoagulation", Electrochimica Acta 55, pp.8165-8171, 2010. DOI: http://dx.doi.org/10.1016/j.electacta.2010.05.018
  8. Alaadin A. Bukhari, "Investigation of the electro-coagulation treatment process for the removal of total suspended solids and turbidity from municipal wastewater", Bioresource Technology 99, pp.914-921, 2008. DOI: http://dx.doi.org/10.1016/j.biortech.2007.03.015
  9. Inoussa Zongo, Amadou Hama Maiga, Joseph Wethe, Gerard Valentin, Jean-Pierre Leclerc, Gerard Paternotte, Francois Lapicque, "Electrocoagulation for the treatment of textile wastewaters with Al or Fe electrodes: Compared variations of COD levels, turbidity and absorbance", Journal of Hazardous Materials 169, pp.70-76, 2009 DOI: http://dx.doi.org/10.1016/j.jhazmat.2009.03.072
  10. In-Soung chang, Robert Field, Zhanfeng Cui, "Limitations of resistance-in-series model for fouling analysis in membrane bioreactors: A cautionary note", Desalination and Water Treatment 8, pp.31-36, 2009. DOI: http://dx.doi.org/10.5004/dwt.2009.687
  11. Peter K. Holt, Geoffrey W. Barton, Cynthia A. Mitchell, "The future for electrocoagulation as a localised water treatment technology", Chemosphere 59, pp.355-367, 2005. DOI: http://dx.doi.org/10.1016/j.chemosphere.2004.10.023
  12. Guohua Chen, "Electrochemical technologies in wastewater treatment", Separation and Purification Technology 38, pp.11-41, 2004. DOI: http://dx.doi.org/10.1016/j.seppur.2003.10.006
  13. Engracia Lacasa, Pablo Canizares, Cristina Saez, Francisco J. Fernandez, Manuel A. Rodrigo, "Electrochemical phosphates removal using iron and aluminium electrodes", Chemical Engineering Journal 172, pp.137-143, 2011. DOI: http://dx.doi.org/10.1016/j.cej.2011.05.080
  14. Jung-Kyoon Chon, Younkyoo Kim, "Investigation of the Growth Kinetics of Al Oxide Film in Sulfuric Acid Solution", Journal of the Korean Chemical Society 54, pp.380-386, 2010. DOI: http://dx.doi.org/10.5012/jkcs.2010.54.4.380
  15. S. Ibeid, M. Elktorowicz, J.A. Oleszkiewicz, "Modification of activated sludge properties caused by application of continuous and intermittent current", Water Research 47, pp.903-910, 2013. DOI: http://dx.doi.org/10.1016/j.watres.2012.11.020